Patent Description:
Current coverings for architectural features include sheer shadings sold under the brand name Silhouette® by Hunter Douglas which typically use generally vertical front and back sheets supporting generally horizontal substantially flexible vane elements, and as described in <CIT>. The vertical support sheets are generally flexible sheer fabrics. The vertical support sheets together with the substantially horizontal flexible vanes form a flexible or soft light-controlling window covering or panel. The flexible nature of the Silhouette® permits it to be operated by rolling and unrolling the flexible light-controlling panel about a roller, and may be referred to as a roll-up type covering. Typically, the sheer panels are made from materials that are clear or dyed white or off-white, and given their strength and durability requirements, result in a muted, somewhat milky view there through ("view-through"). The muted, milky view through is desirable for softening the light being transmitted through the covering, but in direct sun, full view through such sheer materials may be somewhat restricted.

The vanes in Silhouette® are single-layered materials and fabrics, and in certain orientations, these single-layer vanes create shadows on one another. <CIT> and entitled "Coverings for Architectural Openings with Coordinated Vane Sets", discloses a flexible roll-up type window covering with dual-layered, generally horizontal vanes supported by generally vertical supporting members or sheets, which in certain positions and orientations may soften or reduce the shadow on the room-facing sheet. <CIT> and entitled "Covering for architectural features, related systems, and methods of manufacture", discloses panels and/or coverings for architectural features having generally horizontal flexible vane elements coupled to one or more generally vertical support members, which provide light transmission and view-through controlling properties, which in certain positions and orientations may cause the formation of wrinkles or puckers or creases in one or both of the vertical support members which may be undesirable from an aesthetic standpoint and may also lead to issues during roll-up.

It is desirable to have a light-controlling window panel that provides view-through characteristics and also has a desirable aesthetic look.

The present disclosure is directed to a person of ordinary skill in the art. The purpose and advantages of the architectural fabric panel, sheer fabrics, and covering will be set forth in, and be apparent from, the drawings, description, and claims that follow. The summary of the disclosure is given to aid understanding of the panel, sheer fabric, and covering, and not with an intent to limit the disclosure or the invention. It should be understood that each of the various aspects and features of the disclosure may advantageously be used separately in some instances, or in combination with other aspects and features of the disclosure, and/or architectural window coverings in general, in other instances. Accordingly, while the invention is presented in terms of embodiments, it should be appreciated that individual aspects of any embodiment can be utilized separately, or in combination with aspects and features of that embodiment or any other embodiment. In accordance with the present disclosure, variations and modifications may be made to the architectural fabric panel, sheer fabric, or covering to achieve different effects.

The present disclosure features a panel having a sheer fabric, the sheer fabric comprising: a plurality of yarns with a dtex from about <NUM> or greater (denier from about <NUM> or greater), wherein the plurality of yarns are configured to form a plurality of diagonal structures each forming a diamond shaped opening.

The present disclosure features an improved sheer fabric for use in a fabric panel, the sheer fabric including: a plurality of yarns with a dtex of about <NUM> or greater (denier of about <NUM> and greater), including a dtex from about <NUM> up to <NUM> (denier from about <NUM> up to <NUM>), wherein the plurality of yarns are configured to form a plurality of diagonal structures each having a diamond-shaped opening, wherein the sheer fabric has an openness factor of about seventy five percent (<NUM>%) and greater. It will be understood to those skilled in the art that the openness factor percentages are within a normal range of measurement error ranges. In an embodiment, the sheer fabric is a Tulle sheer fabric. The sheer fabric in one or more versions has an elongation percentage upon application of a <NUM> N (<NUM> pound force) in the machine direction (MD) of on average less than about <NUM>% in the machine direction (MD) with a variability of the elongation percentage on average of less than <NUM>% upon application of the <NUM> N (<NUM> pound force) in the machine direction (MD). The sheer fabric, additionally or alternatively, in an aspect, has an elongation percentage upon application of a <NUM> N (<NUM> pound force) in the machine direction (MD) of on average less than about <NUM>%, preferably about <NUM>% or less, in the machine direction (MD) with a variability of the elongation percentage on average of less than <NUM>% upon application of the <NUM> N (<NUM> pound force) in the machine direction (MD). Optionally, the sheer fabric has a maximum break load of on average greater than <NUM> N (<NUM> pound force) in the machine direction (MD). The sheer fabric alternatively or additionally, in an embodiment, has a trapezoid tearing load of on average greater than <NUM> N (<NUM> pound force) in the machine direction (MD).

The plurality of yarns forming the diagonal structure in a further aspect comprises polyester and the diamond-shaped openings have dimensions of about <NUM> in width and about <NUM> in length. The fabric panel in a particular embodiment is configured to have an outer front vertical support member having a height and a width; an outer rear vertical support member having a height and a width, the rear vertical support member substantially parallel to the front vertical support member when the panel is under the influence of gravity, and the rear vertical support member being laterally moveable relative to the front vertical support member; and a plurality of vanes extending from the front vertical support member to the rear vertical support member, wherein the front vertical support member and the rear vertical support members are torsionally attached to at least one of the plurality of slats.

The present disclosure features an improved fabric panel and/or covering for architectural features, which may include windows, doorways, archways and the like, that prevents the formation of wrinkles, puckers, creases, etc. In an embodiment, the covering includes a flexible panel. The flexible panel in an embodiment including a front vertical support member having a height and width; a rear vertical support member having a height and a width, the rear vertical support member substantially parallel to the front vertical support member and laterally moveable relative to the front vertical support member; and a plurality of vanes extending from the front vertical support member to the rear vertical support member, wherein: both the front and rear vertical support members control the movement and angular orientation of the vanes, and at least one of the front or rear vertical support members is a sheer fabric knitted from a plurality of yarns to form a plurality of diagonal structures each having a diamond-shaped opening wherein each of the plurality of yarns have a dtex of about <NUM> up to about <NUM> (denier of about <NUM> up to about <NUM>). The sheer fabric in an embodiment is a Tulle sheer fabric. In a further aspect, the plurality of yarns have a dtex of about <NUM> (denier of about <NUM>). The knitted sheer fabric according to the disclosure has an openness factor that is about sixty-five percent (<NUM>%) and greater, and in a particular embodiment has an openness factor that is about eighty percent (<NUM>%) and greater. It will be understood to those skilled in the art that the openness factor percentages are within a normal range of measurement error ranges. The knitted sheer fabric in a further embodiment forms the rear vertical support member, the front vertical support member is a woven sheer fabric, and the openness factor of the rear vertical support member is greater than the openness factor of the front vertical support member.

The knitted sheer fabric has an elongation percentage of on average less than about <NUM>% in the machine direction (MD) upon application of a <NUM> N (<NUM> pound force) in the machine direction (MD). A variability of the elongation percentage of the knitted sheer fabric upon application of the <NUM> N (<NUM> pound force) in the machine direction (MD) is on average less than about <NUM>% in the machine direction (MD). Additionally or alternatively, the knitted sheer fabric has an elongation percentage of on average less than about <NUM>%, preferably about <NUM>% or less, in the machine direction (MD) upon application of a <NUM> N (<NUM> pound force). A variability of the elongation percentage of the knitted sheer fabric upon application of the <NUM> N (<NUM> pound force) in the machine direction (MD) is on average less than <NUM>% in the machine direction. In a further embodiment, the knitted sheer fabric has a maximum break load of greater than about <NUM> N (<NUM> pound force) in the machine direction (MD). The knitted sheer fabric according to another embodiment additionally or alternatively has a trapezoid tearing load of on average greater than about <NUM> N (<NUM> pound force) in the machine direction (MD). The elongation percentage upon application of a force in the machine direction (MD), the maximum break load in the machine direction (MD), and the trapezoid tearing load in the machine direction (MD) is, in one or more embodiments, wholly, or at least in part, result from the plurality of yarns forming the sheer fabric having a dtex of about <NUM> up to about <NUM> (denier of about <NUM> up to about <NUM>), and in an embodiment, a dtex of about <NUM> (denier of about <NUM>).

The knitted sheer fabric forming the panel is knitted from yarn comprising polyester, and according to an aspect, the diamond-shaped openings have dimensions of about <NUM> in width and about <NUM> in length. First end portions of the front and rear vertical support members in an embodiment are attached to a roller, and in a further aspect, second end portions of at least one of the front or rear vertical support members are attached to an end rail. According to a particular embodiment, the front vertical support member and the rear vertical support members are torsionally attached to at least one of the plurality of slats.

According to another embodiment, a flexible panel for an architectural feature is disclosed where the flexible panel includes a front vertical support member having a height and width; a rear vertical support member having a height and a width, the rear vertical support member substantially parallel to the front vertical support member and laterally moveable relative to the front vertical support member; and a plurality of vanes extending from the front vertical support member to the rear vertical support member, wherein: both the front and rear vertical support members control the movement and angular orientation of the vanes, and at least one of the front or rear vertical support members is a sheer fabric knitted from a plurality of yarns to form a plurality of diagonal structures each having a diamond-shaped opening wherein the knitted sheer fabric has an openness factor of about seventy five percent (<NUM>%) and greater, and an elongation percentage upon application of a <NUM> N (<NUM> pound force) in the machine direction (MD) of on average less than about <NUM>%, preferably about <NUM>% and less, in the machine direction (MD) with a variability of the elongation percentage on average of less than <NUM>% upon application of the <NUM> N (<NUM> pound force) in the machine direction (MD). In an aspect, the plurality of yarns have a dtex of about <NUM> up to <NUM> (denier of about <NUM> up to <NUM>), and in a particular embodiment, a dtex of about <NUM> (denier of about <NUM>). The knitted sheer fabric in one or more embodiments forms the rear vertical support member, the front vertical support member is a woven sheer fabric, and the openness factor of the rear vertical support member is greater than the openness factor of the front vertical support member. In an aspect, the knitted sheer fabric is a Tulle sheer fabric.

The knitted sheer fabric additionally or alternatively has an elongation percentage upon application of a <NUM> N (<NUM> pound force) in the machine direction (MD) of on average less than about <NUM>% in the machine direction (MD) with a variability of the elongation percentage upon application of the <NUM> N (<NUM> pound force) in the machine direction (MD) of on average less than <NUM>% in the machine direction (MD). The maximum break load of the knitted sheer fabric in one or more embodiments is greater than about <NUM> N (<NUM> pound force) in the machine direction (MD). The knitted sheer fabric has a trapezoid tearing load in an embodiment of on average greater than about <NUM> N (<NUM> pound force) in the machine direction (MD). The knitted sheer fabric in an embodiment is a Tulle sheer fabric. The plurality of yarns forming the knitted sheer fabric in an aspect are formed from and comprise polyester, and the diamond-shaped openings in one or more embodiments have dimensions of about <NUM> in width and about <NUM> in length.

The present disclosure features an improved covering for architectural features, which may include windows, doorways, archways and the like, that prevents the formation of wrinkles, puckers, creases, etc. In an embodiment, the covering includes a flexible panel. The flexible panel in an embodiment includes a front vertical support member having a height and a width, a rear vertical support member having a height and a width, the rear vertical support member substantially parallel to the front sheet and operably coupled and laterally moveable relative to the front vertical support member, and a plurality of generally horizontal vanes extending between the front and rear vertical support members. Both the front and rear support members can control the movement and angular orientation of the vanes. In an embodiment, one of the front or the rear vertical support member is a Tulle sheer fabric.

A Tulle sheer fabric for use in a covering for an architectural feature has an openness factor greater than seventy five percent (<NUM>%), and has an elongation percentage on average less than <NUM>% in the machine direction (MD) upon application of a <NUM> N (<NUM> pound force) in the machine direction. In yet another version, a Tulle sheer fabric for use in a covering for an architectural feature has an openness factor greater than seventy five percent (<NUM>%) and has an elongation percentage on average less than <NUM>% in the machine direction (MD) upon application of a <NUM> N (<NUM> pound force). The Tulle sheer fabric has an openness factor of at least as high as <NUM>% and as high as <NUM>%, and preferably an openness factor of greater than <NUM> %. In an embodiment, a Tulle sheer fabric knitted from a yarn with a dtex of about <NUM> to about <NUM> (denier of about <NUM> to about <NUM>) for use in a covering for an architectural feature is disclosed where the Tulle sheer fabric has an openness factor greater than seventy five percent (<NUM>%). In an aspect, the Tulle sheer fabric has diamond-shaped openings and the openings have a width as large as <NUM> and a length as large as <NUM>. The Tulle knit fabric in an embodiment is a dark color (e.g., black), and is combined with a different sheer fabric (e.g., Leno woven sheer) to create a light controlling fabric panel. Optionally, the different sheer fabric is also dark colored (e.g., black).

In addition, the present disclosure is set forth in various levels of detail in this application and no limitation as to the scope of the claimed subject matter is intended by either the inclusion or non-inclusion of elements, components, or the like in this summary. In certain instances, details that are not necessary for an understanding of the disclosure or that render other details difficult to perceive may have been omitted. It should be understood that the claimed subject matter is not necessarily limited to the particular embodiments or arrangements illustrated herein.

The various aspects, features, and embodiments of the architectural covering as disclosed herein will be better understood when read in conjunction with the drawings provided. Embodiments are provided in the drawings for the purposes of illustrating aspects, features and/or various embodiments of the architectural covering, but the claims should not be limited to the precise arrangement, structures, subassemblies, features, embodiments, aspects, and devices shown, and the arrangements, structures, subassemblies, features, embodiments, aspects, and devices shown may be used singularly or in combination with other arrangements, structures, subassemblies, features, embodiments, aspects, and devices. The drawings are not necessarily to scale and are not in any way intended to limit the scope of the claims, but are merely presented to illustrate and describe various embodiments, aspects, and features of the architectural covering to one of ordinary skill in the art.

In the following detailed description, numerous details are set forth in order to provide an understanding of an architectural covering, its method of operation, and method of manufacture. However, it will be understood by those skilled in the art that the different and numerous embodiments of the architectural covering, and its method of operation and manufacture may be practiced without these specific details, and the claims and invention should not be limited to the embodiments, subassemblies, or the specified features or details specifically described and shown herein. The description provided herein is directed to one of ordinary skill in the art and in circumstances, well-known methods, procedures, manufacturing techniques, components, and assemblies have not been described in detail so as not to obscure other aspects, or features, of the architectural covering.

Accordingly, it will be readily understood that the components, aspects, features, elements, and subassemblies of the embodiments, as generally described and illustrated in the figures herein, can be arranged and designed in a variety of different configurations in addition to the described embodiments. It is to be understood that the covering may be used with many additions, substitutions, or modifications of form, structure, arrangement, proportions, materials, and components which may be particularly adapted to specific environments and operative requirements without departing from the scope of the appended claims. The following descriptions are intended only by way of example, and simply illustrate certain selected embodiments of an architectural covering. For example, while the architectural covering is shown and described in examples with particular reference to its use as a window covering to control light and view-through, it should be understood that the covering will have other applications as well. In addition, while the detailed description in many examples is generally directed to a covering formed of one or more generally vertical supporting members described as sheets and particularly sheer sheets, it will be appreciated that the disclosure and teachings have application to other materials forming the vertical support members, such as, for example, tapes, strips, sheets, panels, and combinations thereof. Furthermore, while some embodiments and examples disclose horizontal light controlling elements, referred to herein as vanes or slats, including the use of multi-layered vanes which preferably form multi-layered cellular vanes, it will be appreciated that the disclosure and teachings have application to coverings having cellular vanes and/or single layered vanes, as well as cellular or non-cellular covering that do not contain light-controlling "vanes" or "slats". The claims appended hereto will set forth the claimed invention and should be broadly construed to cover sheer fabric panels, preferably flexible, e.g. for an architectural covering, unless otherwise clearly indicated to be more narrowly construed to exclude embodiments, elements, and/or features of the covering, panel, and/or fabric.

Throughout the present application, reference numbers are used to indicate a generic element or feature of the covering. The same reference number may be used to indicate elements or features that are not identical in form, shape, structure, etc., yet which provide similar functions or benefits. Additional reference characters (such as letters, primes, or superscripts, as opposed to numbers) may be used to differentiate similar elements or features from one another. It should be understood that for ease of description the disclosure does not always refer to or list all the components of the covering, and that a singular reference to an element, member, or structure, e.g., a singular reference to a generally vertical support member, a horizontal vane element, or a strip or a vane, may be a reference to one or more such elements, unless the context indicates otherwise.

In the following description of various embodiments of the architectural covering, it will be appreciated that all directional references (e.g., proximal, distal, upper, lower, upward, downward, left, right, lateral, longitudinal, front, rear, back, top, bottom, above, below, vertical, horizontal, radial, axial, interior, exterior, clockwise, and counter clockwise) are only used for identification purposes to aid the reader's understanding of the present disclosure unless indicated otherwise in the claims, and do not create limitations, particularly as to the position, orientation, or use in this disclosure. Features described with respect to one embodiment typically may be applied to another embodiment, whether or not explicitly indicated.

Connection references (e.g., attached, coupled, connected, and joined) are to be construed broadly and may include intermediate members between a collection of elements and relative movement between elements unless otherwise indicated. As such, connection references do not necessarily infer that two elements are directly connected and in fixed relation to each other. Identification references (e.g., primary, secondary, first, second, third, fourth, etc.) are not intended to connote importance or priority, but are used to distinguish one feature from another. The drawings are for purposes of illustration only and the dimensions, positions, order and relative sizes reflected in the drawings may vary.

As used herein, with respect to nonwoven fabrics, the term "machine-direction" or "MD" refers to the direction in which continuous strands or filaments are laid down on a support as the nonwoven fabric is produced, for example on commercial nonwoven fabric making equipment. Likewise, the term "cross-direction" or "CD" refers to the direction perpendicular to the machine-direction. With respect to fabrics, the terms refer to the corresponding directions of the fabric with respect to the filaments used to produce the fabric. These directions are distinguished herein because the mechanical properties of nonwoven fabrics can differ, depending on how the test sample is oriented during testing. For example, tensile properties of a nonwoven fabric differ between the machine-direction and the cross-direction, due to the orientation of the constituent fibers, and other process-related factors.

The present disclosure relates to coverings for architectural features which include, for example, windows, door frames, archways, and the like. The coverings are particularly useful for windows to provide an aesthetic look, and desirable shading and privacy. The coverings in an embodiment generally comprise a flexible subassembly or panel that includes one or more flexible, moveable, generally horizontal vane elements extending between one or more flexible, movable, generally vertical front and/or rear support members. The generally horizontal vane elements, also referred to as vanes or slats herein, preferably are formed of fabric and have a different light transmissivity or translucence than the generally vertical support members, and the vanes and support members together control view-through and light transmission through the covering. Other types and styles of covering are contemplated, such as, for example, cellular accordion style shades that open and close by stacking, and the teachings and disclosure are not limited to roll-up style coverings.

The one or more generally vertical support members in an embodiment are formed of fabric and in an embodiment are substantially parallel to each other and in embodiments may not have any fold lines, creases and the like. The generally vertical support members may include, for example, sheets, panels, tapes, strips, or the like, and combinations of these elements. Each vertical support member may be formed of a single or multiple piece(s) of material, and may be substantially flat and planar. The vertical support members have a height (length), width and thickness, their thickness (generally perpendicular to their height and width) may be relatively thin, and the vertical support members generally are made of materials that are much thinner than their respective length (height) and/or width. The "height" of the vertical support members, also referred to as the "length", generally and typically corresponds to and is associated with the height or vertical dimension of the covering or panel, while the width of the vertical support members generally and typically corresponds to the width of the covering or panel, and the width of the architectural opening. The width of the vertical support members may or may not extend the length of the vane elements. In one embodiment the height and width of the front and/or rear vertical support member is substantially the same as the height and width of the panel. For ease of reference and without intent to limit the disclosure, the one or more vertical support members sometimes will be referred to in the disclosure as sheets, and in one or more embodiments, the one or more front and rear vertical support members are formed of sheers.

The front and rear generally vertical support members, and the vane elements, may be substantially any type of material, and are preferably formed from flexible materials, such as, but not limited to, textiles, fabrics, and films, including knits, wovens, non-wovens, and so on. For ease of reference, the subassembly including the support members will be referred to as a light-controlling panel, subassembly, or "panel" for short. In one exemplary embodiment, the generally one or more vertical support members are made from generally flexible, soft materials, and form a generally flexible subassembly or panel for the covering.

Additionally, the vertical support members preferably have light transmissivity properties varying from translucent to substantially transparent or clear. In one embodiment, at least one, preferably both, of the front and/or rear supporting members are sheers and/or materials that permit light to pass there-through.

Referring generally to the illustrative embodiments of <FIG>, the covering <NUM> in one embodiment generally includes a headrail <NUM>, a roller <NUM> associated with the head rail, a light-controlling panel <NUM>, a bottom rail or weight <NUM>, and a control mechanism <NUM> to operate the covering (e.g., a mechanism to rotate the roller) and control the amount, quality, and manner in which light is blocked or transmitted through the panel, as well as the aesthetic look and appearance of the panel. In one embodiment, a head tube or roller <NUM> supports and is connected to a top end <NUM> of panel <NUM>, and bottom rail <NUM> is connected to a bottom end <NUM> of panel <NUM>. In an embodiment, the panel may have one of a front and/or rear vertical support member, and preferably has front and rear vertical support members. In one embodiment, the front and rear vertical support members are coupled directly or indirectly to the roller, and preferably at different horizontally extending locations along the circumference of the roller to provide lateral movement of the front and rear vertical support members relative to each other. Head rail <NUM> may support the roller <NUM> and the panel may be connected to roller <NUM> over an architectural opening, and thus head rail <NUM> may generally correspond to the shape and dimensions (e.g., width) of the top of the architectural opening. Panel <NUM> includes generally horizontal vanes <NUM> extending between a generally vertical front support member <NUM> and a generally vertical rear support member <NUM>. Vanes <NUM> extend from and between, and may be coupled to, front and rear support members <NUM>, <NUM>, and move between a first or open position where at least a middle portion of the vanes are substantially horizontal and generally orthogonal to the front and rear support members and a second or closed position where at least a middle portion of the vanes are substantially vertical and generally parallel to the front and rear support members. In an embodiment, the generally vertical support members <NUM>, <NUM> are substantially parallel to each other whether the vane elements are in an open or closed position, and the generally vertical support members have no fold lines, creases, or the like.

Covering <NUM> may include a control mechanism <NUM> for controlling the retraction and extension of light-controlling panel <NUM> to control the height of the covering in the opening and hence the nature and quality of the light transmitted through, the view-through characteristics, and the shape and aesthetic nature of panel <NUM>. The control mechanism <NUM> may also control the angular orientation of horizontal vane elements <NUM> with respect to support members <NUM>, <NUM> which will also affect the nature and quality of the light transmitted through, the view-through characteristics, and the shape and aesthetic appeal of the panel <NUM>. In the rollup-type window covering illustrated in <FIG>, the control mechanism <NUM> preferably rotates roller <NUM>. In particular, control mechanism <NUM> rotates roller <NUM> in order to retract or extend the light controlling panel <NUM>, or angularly orient vanes <NUM> of light-controlling panel <NUM>. The light-controlling panel may move between a fully retracted position where the panel is completely wrapped about the roller, to a fully extended position where the panel is completely unwound from the roller and extends in the opening with the vertical support members generally parallel and adjacent to each other with the vanes located between the support members and oriented substantially vertical and parallel to the vertical support members (see <FIG>). In one example, control mechanism <NUM> may include a cord <NUM> for rotating the roller, and/or may include a pulley <NUM>, a direct drive arrangement, a gear train, and/or a clutch mechanism. The system or mechanism for controlling the rotation of roller <NUM> may include an electric motor which may be controlled manually by a user, or through a pre-programmed or programmable software control unit, such as a remote control. Control mechanism may include any desired control mechanism including those now known and control mechanisms developed in the future. In addition, while control mechanisms discussed above are directed primarily to rotating a roller or mechanisms for a roll-up type covering, it will be appreciated that other arrangements and mechanisms now known or later developed, for example, mechanisms for stacking and folding arrangements, and/or lifting of the bottom rail may instead be used to control movement of the panel <NUM>.

For ease of reference purposes, when used, for example, as a window covering, the generally vertical support member <NUM> that faces the exterior <NUM> of the window opening is referred to as the rear support member or sheet, while the generally vertical support member <NUM> that faces the interior <NUM> of the window opening is referred to as front support member or sheet <NUM>. The angular orientation and movement of vanes <NUM>, in a roll-up type covering having vanes <NUM> extending between and coupled to vertical support members, is effected by relative movement of the support members. Front and rear support members <NUM>, <NUM> may move vertically in unison as they are unrolled from roller <NUM> (<FIG>) to extend in the window opening. After the window covering is fully extended and unrolled from roller <NUM> (shown in <FIG>), further rotation of roller <NUM> moves front support member <NUM> and/or rear support member <NUM> laterally or horizontally away from each other, and further moves front and rear support members <NUM>, <NUM> in relative vertically opposite directions (<FIG>, & <NUM> and <NUM>). The vanes of the window covering may extend between the vertical support members in different manners so as to orient the vanes in different angular orientations or directions and configure them to operate or move in different directions and orientations to effect the amount of light transmitted through the panel and/or the visibility through the covering. A shading orientation is shown in <FIG> and a privacy orientation is shown in <FIG>. In the privacy orientation, a person under the window and looking up may be blocked from viewing into the room due to vanes <NUM> blocking their view-through. One skilled in the art can also appreciate that generally the light-controlling and view-through characteristics including the angular orientation and relative movement of vanes <NUM> in a roll-up type covering, may be affected by whether the support members extend from the rear side <NUM> or front side <NUM> of the roller and/or the direction of rotation of the roller.

The material and design for the front and rear support members <NUM>, <NUM> are independent aspects of the design of panel <NUM>. In one embodiment, the front and rear support members may be formed partially or wholly as sheers, and more preferably sheer fabrics. A sheer is a material that has openings that permit light and view-through. The openness of a material, e.g., a sheer, may be measured by its openness factor which measures the percent of open space in, for instance, a material, where a <NUM>% openness factor ("OF") has <NUM>% material and <NUM>% holes or open spaces. The higher the openness factor OF, the more sheer and better view through provided by the material. One manner of measuring openness factor is to measure the area of the yarns and/or open areas and calculate the percentage of area that has no material. In one example, a digital microscope or high resolution camera may be used to capture an image of the material and the image used to calculate the percentage that does not have fabric, yarns, or material. A Motic digital microscope and Motic Image Plus <NUM> Software may be used to measure the openness factor of various materials.

Support members with a higher openness factor of as small as sixty percent (<NUM>%) to as high as eight six percent (<NUM>%) in increments therebetween of about one percent (<NUM>%) are preferred for aesthetic reasons. It will be understood to those skilled in the art that the percentage ranges disclosed in this specification are within a normal margin of measurement errors.

In certain configurations, the openness factor is about sixty five percent (<NUM>%) to about eighty percent (<NUM>%), about seventy percent (<NUM>%) to about seventy five percent (<NUM>%), about eighty percent (<NUM>%) to about eighty five percent (<NUM>%), or the like. In particular, support members with a high openness factor, preferably greater than sixty percent (<NUM>%), more preferably greater than sixty-five percent (<NUM>%), greater than seventy percent (<NUM>%), more preferably greater than seventy-five percent (<NUM>%), and/or greater than eighty percent (<NUM>%) or higher, in increments therebetween of about one percent (<NUM>%), may be preferred for aesthetic reasons. In embodiments, different finer (thinner) yarns may be used which may contribute to a higher openness factor. Use of dark colored or black yarns may be advantageous for the additional reason that sunlight may not degrade the materials in the covering, and the materials will retain their strength.

When constructing a panel <NUM> having two support members formed as sheers, partial sheers, or with numerous openings as the vertical supporting members, factors such as strength, durability, stretch (elongation), UV degradation, and moiré light interference are all factors in the design of an acceptable covering <NUM>. Moiré may occur as a result of light interference when two sheer materials overlay each other and light is transmitted therethrough. Moiré which is a light interference artifact that may occur in a covering having front and back sheers as vertical support members, is preferably avoided or at least minimized and reduced when producing a covering, particularly coverings for windows and the like where light passes there through.

One manner of reducing moiré is to use different sheer fabrics for the front support member and the rear support member, and/or selecting, processing, and/or configuring sheer fabrics so that the yarns, and interstitial spacing and connection points do not align or nearly align.

In one embodiment of panel <NUM>, an orthogonal grid fabric may be used as front support member <NUM>. For example, a Leno or gauze weave sheer fabric may be used for the front support member <NUM>. In a Leno sheer fabric, warp yarns are used in pairs and twisted together to trap the weft yarns in place so that the yarns do not slide, which would alter their spacing. The Leno sheer fabric allows a wider spacing of yarns and a very open weave with fine yarn which provides good view-through. In one embodiment, the Leno weave for the front support member has a cross-direction density of about <NUM> yarns per cm (<NUM> yarns per inch (ypi)) (cross yarn is two yarns twisted together) and a machine direction density of about <NUM> ypcm (<NUM> ypi). In one embodiment, the Leno weave for the front support member has a rectangularly-shaped opening with dimensions of about <NUM> in width (distance between paired warp yarns) and about <NUM> in length (distance between weft yarns). Other cross and machine direction density values are contemplated and exemplary values would range from about <NUM> to about <NUM> cross direction ypcm (<NUM> to about <NUM> cross direction ypi) and about <NUM> to about <NUM> cross direction ypcm (<NUM> to about <NUM> machine direction ypi) depending upon the yarn denier. In another embodiment, the fabric for the front support member is a Leno or plain weave, with <NUM> warp ypcm (<NUM> warp ypi) and <NUM> pairs of weft ypcm (<NUM> pairs of weft ypi). Preferably, the front support member has an openness factor of as small as about sixty percent (<NUM>%) to about as high as about eighty five percent (<NUM>%), which may vary therebetween in increments of about one percent (<NUM>%). In certain embodiments, the openness factor is about sixty five percent (<NUM>%) to about eighty percent (<NUM>%), about seventy percent (<NUM>%) to about seventy five percent (<NUM>%), about eighty percent (<NUM>%) to about eighty five percent (<NUM>%), or the like. Preferably, the front support member is a sheer fabric that has an openness factor of greater than sixty percent (<NUM>%), more preferably greater than about sixty-five percent (<NUM>%), more preferably about seventy percent (<NUM>%) or higher including about seventy-five percent (<NUM>%), about eighty percent (<NUM>%), and about eighty-five (<NUM>%). The Leno sheer fabric, in an embodiment, may be made from monofilament or multifilament yarn with a warp dtex (denier) that ranges from about <NUM> to about <NUM> (about <NUM> to about <NUM>), about <NUM> to about <NUM> (about <NUM> to about <NUM>), and preferably about <NUM> dtex (<NUM> denier). The denier of the weft yarn, in an embodiment, may be as small as about <NUM> dtex (<NUM> denier) to as high as about <NUM> dtex (<NUM> denier), and preferably about <NUM> dtex (<NUM> denier). An example of a Leno sheer fabric for use in the covering is an Englebert Steiger Leno fabric which has <NUM> dtex (<NUM> denier) warp yarns and <NUM> dtex (<NUM> denier) filling or weft yarns. The Englebert Steiger Leno sheer fabric preferably has an openness factor greater than about sixty-five percent (<NUM>%). While, the Leno sheer fabric with orthogonal grid has been discussed as being used as the front vertical support member, it will be appreciated that the Leno sheer fabric may be used as the rear vertical support member, and other materials, including preferably sheer materials, may be used as the front vertical support member.

Further, a different fabric, for example, a diagonal grid fabric may be used for the rear support member <NUM>. The rear support member in an embodiment is a sheer fabric knitted to form a plurality of diagonal structures each having a diamond-shaped opening. That is the plurality of yarns forming the sheer fabric form a diagonal grid structure having diamond-shaped openings in between the plurality of yarns. The diagonal grid structure in a particular embodiment is a knit Tulle sheer fabric. Other fabrics with similar properties, e.g., a plurality of diagonal structures each having diamond-shaped opening, and/or openness factor are within the scope of this disclosure. The Tulle fabric may be made on an about <NUM> to about <NUM> gauge warp knitting machine, and preferably a twenty-eight (<NUM>) gauge warp knitting machine. In a twenty-eight (<NUM>) gauge warp knitting machine, <NUM> warp yarns per cm (twenty-eight (<NUM>) warp yarns per inch) are fed into the knitter, and no fill yarns are used on the warp knitter. In an exemplary embodiment, the Tulle fabric for the rear support member is about <NUM>-<NUM> gauge (yarns), preferably <NUM> gauge (yarns), in the cross (width) direction and about <NUM> courses per cm (<NUM> courses per inch) in the machine direction. The rear support member has an openness factor of seventy-five percent (<NUM>%) or greater, or preferably about eighty percent (<NUM>%) or higher, and about eighty-five percent (<NUM>%). That is, front and rear support members with an openness factor that ranges from as low as about sixty percent (<NUM>%) to as high as about eighty-six percent (<NUM>%) have produced desirable results. In one embodiment, the Tulle sheer fabric may have an openness factor of greater than seventy-five percent (<NUM>%) and less than ninety percent (<NUM>%), and more preferably between about eighty percent (<NUM>%) and about eighty-six percent (<NUM>%). While this disclosure describes an openness factor of the front support member of as low as about sixty percent (<NUM>%) and as high as about eighty six percent (<NUM>%), in increments therebetween of about one percent (<NUM>%), other openness factors are within the scope of this disclosure and may be selected based on various design considerations for the panel <NUM> (for example, blocking light and/or desired view through characteristics). While a diagonal grid sheer fabric with diamond-shaped openings, and particularly a knit Tulle sheer fabric, has been disclosed as being used for the rear vertical support member, it may be appreciated that a diagonal grid sheer fabric, for example a knit Tulle sheer fabric, may be used for the front vertical support member and other materials, including preferably sheer materials, may be used for the rear vertical support member.

In an embodiment, the rear support member <NUM> has an openness factor that is greater than the openness factor of the front support member <NUM>.

In an embodiment, the front and/or rear support member may be a sheer fabric (preferably a Tulle knit fabric) that has an openness factor as low as about seventy five percent (<NUM>%) and as high as about eighty five percent (<NUM>%), in increments therebetween of about one percent (<NUM>%), and has an elongation percentage on average less than about <NUM>% in the machine direction (MD) upon application of a <NUM> N (<NUM> pound force). Preferably, the Tulle fabric has an elongation percentage on average of not more than. <NUM>% elongation, not more than. <NUM>% elongation, not more than. <NUM>% elongation, or not more than. <NUM>% elongation in the machine direction (MD) upon application of a <NUM> N (<NUM> pound force). Preferably, the openness factor may be about seventy-five percent (<NUM>%), and greater about eighty percent (<NUM>%) or higher, and about eighty-five percent (<NUM>%). The variability of elongation of such a fabric, in an embodiment, is on average less than about <NUM>% upon application of a <NUM> N (<NUM> pound force) in the machine direction (MD).

In another embodiment, the front and/or rear support member may be a sheer fabric (preferably a Tulle knit fabric) that has an openness factor as low as about seventy five percent (<NUM>%) and as high as about eighty five percent (<NUM>%), in increments therebetween of about one percent (<NUM>%), and has an elongation percentage on average less than about <NUM>%, preferably less than about <NUM>%, in the machine direction (MD) upon application of a <NUM> N (<NUM> pound force) in the machine direction (MD). Preferably, the Tulle fabric has an elongation percentage on average of not more than <NUM>%, not more than <NUM>%, not more than <NUM> %, and not more than about <NUM>% in the machine direction (MD) upon application of a <NUM> N (<NUM> pound force) in the machine direction (MD). Preferably, the openness factor may be about seventy-five percent (<NUM>%) and greater, about eighty percent (<NUM>%) or higher, and about eighty-five percent (<NUM>%). The variability of elongation of such a fabric in the machine direction (MD), in an embodiment, is on average less than about <NUM>% upon application of a <NUM> N (<NUM> pound force) in the machine direction (MD).

In an embodiment, the front and/or rear support member may be a sheer fabric (preferably a Tulle knit fabric) that has an openness factor as low as about seventy five percent (<NUM>%) and as high as about eighty five percent (<NUM>%), and has a maximum break load of on average greater than about <NUM> N (<NUM> pound force) in the machine direction (MD). Preferably, the Tulle fabric has a maximum break load of on average greater than about <NUM> N (<NUM> pound force), greater than about <NUM> N (<NUM> pound force), or greater than about <NUM> N (<NUM> pound force). Preferably, the openness factor may be about seventy-five percent (<NUM>%) and greater, about eighty percent (<NUM>%) or higher, and about eighty-five percent (<NUM>%), in increments therebetween of about one percent (<NUM>%).

In an embodiment, the front and/or rear support member may be a sheer fabric (preferably a Tulle knit fabric) that has an openness factor as low as about seventy five percent (<NUM>%) and as high as about eighty five percent (<NUM>%), and has a trapezoid tearing load of on average greater than about <NUM> N (<NUM> pound force) in the machine direction (MD). Preferably, the Tulle fabric has a trapezoid tearing load of on average greater than about <NUM> N (<NUM> pound force), greater than about <NUM> N (<NUM> pound force), or greater than about <NUM> N (<NUM> pound force). Preferably, the openness factor may be about seventy-five percent (<NUM>%) or greatuer, about eighty percent (<NUM>%) or higher, and about eighty-five percent (<NUM>%), in increments therebetween of about one percent (<NUM>%).

<CIT> and entitled "Coverings for Architectural Openings with Coordinated Vane Sets", described a Tulle fabric for forming the rear support member <NUM> of a light-controlling panel that is formed of <NUM> dtex (<NUM> denier) yarn. However, the use of the <NUM> dtex (<NUM> denier) yarn knit Tulle fabric may result in elongation over time, which may facilitate or cause the formation of wrinkles or creases, sometimes referred to as "puckers". The effect may not be aesthetically pleasant and may cause issues during roll-up of the light-controlling panel. This disclosure describes the use of a Tulle fabric that may be formed of yarn having a dtex of about <NUM> or greater (denier of about <NUM> or greater), including a dtex as low as about <NUM> (denier as low as about <NUM>) to as high as about <NUM> dtex (<NUM> denier) yarn, preferably a <NUM> dtex (<NUM> denier) yarn, that may be monofilament or multifilament. In an embodiment, the Tulle fabric may be formed of dtex (denier) yarn of greater than <NUM> (<NUM>), such as, for example, <NUM> dtex (<NUM> denier) yarn, selected such that the openness factor is at least <NUM>%. As used herein, "denier" is a unit of measurement, i.e., linear mass density (g/<NUM>), that defines the thickness of individual threads or filaments used in the creation of a fabric and refers to the fineness of a fiber. Fabrics with a high denier number are thick, sturdy, and inflexible, while fabrics with a low denier number are thin, flexible, soft, and silky. Using a high denier count yarn would be expected to detrimentally affect the openness factor of the fabric. The use of yarn having a denier of about <NUM> and higher, including a dtex (denier) as low as about <NUM> (<NUM>) to as high as about <NUM> (<NUM>), preferably a <NUM> dtex (<NUM> denier) yarn, surprisingly and unexpectedly reduces and/or prevents the formation of undesirable wrinkles or puckers or creases, while preserving the desired visibility through the sheer (openness factor) in a light-controlling panel. The <NUM> dtex (<NUM> denier) yarn has considerably less elongation (stretch) and retains its dimensions and shape with little to no effect on its view-through (openness factor), and the consistency of the elongation of the fabric under load from sample to sample, i.e., the standard deviation of the amount of elongation under load, is considerably improved. It will be understood to those skilled in the art that <NUM>-<NUM> dtex (<NUM>-<NUM> denier) yarn Tulle fabric is selected to achieve an openness factor of as low as about sixty percent (<NUM>%) and as high as about eighty five percent (<NUM>%) while preventing elongation and formation of puckers, other ranges of the denier for different openness factors are within the scope of this disclosure.

Various physical properties of a <NUM> dtex (<NUM> denier) polyester yarn Tulle fabric were tested and compared to those of the <NUM> dtex (<NUM> denier) polyester yarn Tulle fabric knitted using the same process and subjected to the same finishing process (described below). It was unexpectedly found that while the <NUM> dtex (<NUM> denier) yarn Tulle fabric has an openness factor that is only about <NUM>% to about <NUM>% less open, and more specifically in an example about <NUM>% less open than that of the <NUM> dtex (<NUM> denier) yarn Tulle fabric, unexpectedly various other properties of the <NUM> dtex (<NUM> denier) yarn Tulle fabric that reduce or prevent formation of creases or wrinkles or puckers and/or elongation (or other deformation) over time were markedly different from those of the <NUM> dtex (<NUM> denier) yarn Tulle fabric. Denier yarn values of as low as about <NUM> dtex (<NUM> denier) to as high as about <NUM> dtex (<NUM> denier), and more specifically about <NUM> dtex (<NUM> denier) yarn, for the Tulle fabric used in the rear panel of the covering <NUM> in combination with the Leno front panel is unique and achieves unexpected results of a dimensionally stable fabric with remarkably less stretch or elongation, which reduces or eliminates the formation of unsightly wrinkles or creases or puckers, while not sacrificing view through (the openness factor) when compared to a comparable <NUM> dtex (<NUM> denier) yarn knit Tulle fabric.

For example, when pulled in the MD on a calibrated INSTRON™ tensile tester using a <NUM> N (<NUM> pound force), the <NUM> dtex (<NUM> denier) yarn Tulle fabric on average undergoes about <NUM>% to about <NUM>%, and more specifically about <NUM>%, less elongation compared to the <NUM> dtex (<NUM> denier) yarn Tulle fabric. Importantly, the elongation of the <NUM> dtex (<NUM> denier) yarn Tulle fabric was found to be markedly more stable and consistent in elongation testing with about <NUM>% less variability compared to the <NUM> dtex (<NUM> denier) yarn Tulle fabric over time or upon repeated application of the <NUM> N (<NUM> pound force). The <NUM> dtex (<NUM> denier) yarn Tulle fabric when pulled in the MD on a calibrated INSTRON™ tensile tester using a <NUM> N (<NUM> pound force) also undergoes on average about <NUM>% to about <NUM>%, and more specifically about <NUM>%, less elongation compared to the <NUM> dtex (<NUM> denier) yarn Tulle fabric. The elongation of the <NUM> dtex (<NUM> denier) yarn Tulle fabric was found on average to be about <NUM>% to <NUM>% less variable, more specifically about <NUM>% less variable, in MD compared to the <NUM> dtex (<NUM> denier) yarn Tulle fabric over time or upon repeated application of the <NUM> N (<NUM> pound force). The <NUM> dtex (<NUM> denier) yarn Tulle fabric has lower elongation and a much more consistent amount of elongation which is advantageous for manufacturability as it retains its dimensions and shape much better and does not elongate as much upon application of a load. The difference in standard deviation of the percent elongation of the <NUM> dtex (<NUM> denier) Tulle fabric versus the <NUM> dtex (<NUM> denier) Tulle fabric permits better tolerances during manufacturing of the panel. This results in an unexpectedly better and improved light-controlling panel, which has less unsightly wrinkles or "puckers".

Moreover, the <NUM> dtex (<NUM> denier) yarn Tulle fabric is stronger than the <NUM> dtex (<NUM> denier) yarn Tulle fabric. Thinner, low denier yarns (e.g., <NUM> dtex (<NUM> denier) yarn) can have less strength and abrasion resistance and thus be susceptible to breakage due to the stresses and strains during weaving, knitting, or other construction, as well as during normal usage. Therefore, use of higher denier yarn (e.g., <NUM>-<NUM> dtex (<NUM>-<NUM> denier) yarn) can help protect the yarn from such stresses and strains during manufacture and usage. This is apparent from increased resistance to tearing and increased maximum break load of the <NUM> dtex (<NUM> denier) yarn fabric. The maximum break load and elongation of the <NUM> dtex (<NUM> denier) yarn Tulle fabric upon application of a continually increasing tension, a measure of the strength of fabric, was found in the MD to be on average about <NUM>% to about <NUM>%, more specifically about <NUM>%, more than that of the <NUM> dtex (<NUM> denier) yarn Tulle fabric. Finally, the <NUM> dtex (<NUM> denier) yarn Tulle fabric is also more resistant to tearing in the MD compared to the <NUM> dtex (<NUM> denier) yarn Tulle fabric. For example, the <NUM> dtex (<NUM> denier) yarn Tulle fabric on average is about <NUM>% to about <NUM>%, and more specifically on average about <NUM>%, more resistant to tearing in the MD.

The above percentage differences between the elongation properties of the <NUM> dtex (<NUM> denier) yarn and the <NUM> dtex (<NUM> denier) yarn Tulle fabric are exemplary and other values are within the scope of this disclosure. A preferred fabric has a desired openness factor and also is resistant to elongation, puckers, and tearing during manufacturing as well as usage.

<FIG> illustrate the representative knit structure of the <NUM> dtex (<NUM> denier) monofilament yarn Tulle fabric (<NUM>) and the <NUM> dtex (<NUM> denier) monofilament yarn Tulle fabric (<NUM>), respectively on a MOTIC DIGITAL™ Microscope Model #DM143 with the arrow "MD" indicating the machine direction. Both samples were prepared using a <NUM> gauge knitter and then both samples were stretched to about <NUM> gauge. A MOTIC DIGITAL™ Microscope Model #DM143 was used to determine the percent openness of the <NUM> dtex (<NUM> denier) yarn and the <NUM> dtex (<NUM> denier) yarn Tulle fabric. The percentage openness of the <NUM> dtex (<NUM> denier) yarn Tulle fabric was determined to be about <NUM>%, and the percentage openness of the <NUM> dtex (<NUM> denier) yarn Tulle fabric was determined to be about <NUM>%. The difference in openness factor between the two Tulle knit sheer fabrics is only about <NUM>% to <NUM>% and is not readily apparent to the naked eye. In an embodiment, the <NUM> dtex (<NUM> denier) yarn Tulle fabric tested in this disclosure has an openness factor above <NUM>%.

In an embodiment, the <NUM> dtex (<NUM> denier) yarn Tulle fabric when pulled on a calibrated INSTRON™ tensile tester using a <NUM> N (<NUM> pound force) in the MD direction has an elongation percentage on average of about <NUM>%, with a minimum elongation of about. <NUM>% and a maximum elongation of about. The standard deviation of elongation percentage testing in the MD direction using a <NUM> N (<NUM> pound force) was <NUM> lbs. The <NUM> dtex (<NUM> denier) yarn Tulle fabric when pulled on a calibrated INSTRON™ tensile tester using a <NUM> N (<NUM> pound force) has an elongation percentage in the MD direction on average of about <NUM>%, with a minimum elongation of about <NUM>% and a maximum elongation of about <NUM>%. The standard deviation of elongation percentage testing using a <NUM> N (<NUM> pound force) in the MD direction was <NUM> lbs. The <NUM> dtex (<NUM> denier) yarn Tulle fabric has a maximum break load, in the MD direction, on average of about <NUM> N (<NUM> lbf), with a minimum break load of about <NUM> N (<NUM> lbf) and a maximum break load of about <NUM> N (<NUM> lbf), with an accompanying average elongation of about <NUM> (<NUM> inches), and a minimum elongation of about <NUM> (. <NUM> inches) and a maximum elongation of about <NUM> (<NUM> inches). The percent of elongation of the <NUM> dtex (<NUM> denier) Tulle fabric in the MD direction at the maximum break load in the MD direction is on average not more than fifteen percent (<NUM>%). The <NUM> dtex (<NUM> denier) yarn Tulle fabric tears under a trapezoid tearing load on average in the MD of about <NUM> N (<NUM> lbf), with a minimum tearing load of about <NUM> N (<NUM> lbf) and a maximum tearing load of about <NUM> N (<NUM> lbf). It is believed that the denier of the yarn forming the sheer fabric imparts, at least in part, the improved elongation in the machine direction (MD) upon application of a force in the machine direction (MD), as well as the improved variability (e.g., standard deviation) of the elongation in the machine direction (MD) upon application of a force in the machine direction (MD). It is also believed that the denier of the yarn forming the sheer fabric imparts, at least in part, the improved maximum break load and trapezoid tearing load in the machine direction (MD).

In an embodiment, the <NUM> dtex (<NUM> denier) yarn Tulle fabric, when pulled in the CD direction on a calibrated INSTRON™ tensile tester using a <NUM> N (<NUM> pound force), has an average elongation percentage of about <NUM>%, with a minimum elongation percentage of about <NUM>% and a maximum elongation percentage of about <NUM>%. The standard deviation of elongation percentage testing in the CD direction using a <NUM> N (<NUM> pound force) was <NUM> lbs. The <NUM> dtex (<NUM> denier) yarn Tulle fabric when pulled in the CD direction on a calibrated INSTRON™ tensile tester using a <NUM> N (<NUM> pound force) has on average an elongation percentage of about <NUM>%, with a minimum elongation of about <NUM>% and a maximum elongation of about <NUM>%. The standard deviation of elongation percentage testing in the CD direction using a <NUM> N (<NUM> pound force) was <NUM> lbs. The <NUM> dtex (<NUM> denier) yarn Tulle fabric has a maximum break load, in the CD direction, of, on average, <NUM> N (<NUM> lbf), with a minimum break load of <NUM> N (<NUM> lbf) and a maximum break load of about <NUM> N (<NUM> lbf), (with an accompanying elongation on average of about <NUM> (<NUM> inches), with a minimum elongation of about <NUM> (<NUM> inches) and a maximum elongation of about <NUM> (<NUM> inches). The percent of elongation of the <NUM> dtex (<NUM> denier) Tulle fabric in the CD direction at the maximum break load in the CD direction is on average considerably higher than the percentage of elongation in the MD direction and is on average between about <NUM>% and <NUM>%. The <NUM> dtex (<NUM> denier) yarn Tulle fabric tears under a trapezoid tearing load in the CD direction on average of about <NUM> N (<NUM> lbf), with a minimum tearing load of about <NUM> N (<NUM> lbf) and a maximum tearing load of about <NUM> N (<NUM> lbf).

In an embodiment, the Tulle sheer fabric has an elongation percentage on average less than about <NUM>% in the machine direction (MD) upon application of a <NUM> N (<NUM> pound force) and the variability of elongation of the Tulle sheer fabric in the MD is on average less than about <NUM>%. The Tulle sheer fabric has an elongation percentage on average less than about <NUM>%, preferably less than about <NUM>%, in the MD upon application of a <NUM> N (<NUM> pound force) and the variability of elongation of the Tulle sheer fabric in the machine direction is on average less than <NUM>%. The Tulle sheer fabric has a maximum break load of greater than about <NUM> N (<NUM> pound force) in the MD (with an elongation of on average as low as about <NUM> (<NUM> inches) to as high as about <NUM> (<NUM> inches) upon application of maximum break load), and has a trapezoid tearing load of on average less than about <NUM> N (<NUM> pound force) in the machine direction (MD).

Various testing of the <NUM> dtex (<NUM> denier) yarn Tulle fabric are described and reported below. Each test was performed on <NUM> samples of fabric in the MD and the CD. Each of the Tulle fabric samples were knitted with <NUM> dtex (<NUM> denier) monofilament, polyester yarns on a <NUM> gauge machine and then the fabric was stretched to approximately <NUM> gauge.

This test is performed to determine the elongation of material when stretched and held at specific weight. Sample fabric pieces of a pre-determined size are loaded in an INSTRON™ Model <NUM> Tensile Tester and a steady load is applied to the sample fabrics. A load cell and <NUM> (<NUM>") serrated wedge grips were used for conducting the test. The elongation testing in the MD would simulate a load applied to the Tulle fabric in a light-controlling panel.

The elongation was first tested using a <NUM> N (<NUM> pound force (lbf)). The test was run at a constant crosshead speed of <NUM>/min (<NUM> in. /min) with a grip distance of <NUM> (<NUM>"). The size of the fabric samples were <NUM> (<NUM>") x <NUM> (<NUM>"). Results of the elongation and deformation test are shown for <NUM> dtex (<NUM> denier) yarn fabric in TABLE <NUM>(a) and <FIG> for the MD, and Table <NUM>(b) and <FIG> for the CD.

The elongation of the <NUM> dtex (<NUM> denier) Tulle fabric samples was also tested using a <NUM> lb load. The test was run at a constant crosshead speed of <NUM>/ min (<NUM> in. /min) with a grip distance of <NUM> (<NUM>"). The size of the fabric samples were <NUM> (<NUM>") x <NUM> (<NUM>"). Results of the elongation and deformation test are shown for a <NUM> dtex (<NUM> denier) yarn fabric in TABLE <NUM>(a) and <FIG> for the MD, and Table <NUM>(b) and <FIG> for the CD.

A cut strip tensile test was conducted to determine the maximum break load and elongation when a continually increasing tension is applied to the sample fabric at a constant rate of speed in an INSTROM™ Model <NUM> tensile tester. This test is used to measure the strength of the fabric. The size of the fabric samples were <NUM> (<NUM>") x <NUM> (<NUM>"), and the test was run at a constant crosshead speed of <NUM>/min (<NUM> in. /min) with a grip distance of <NUM> (<NUM>"). The grippers of the INSTROM™ tester for the tensile tests grip the fabric sample along the <NUM> (<NUM>") width for both the MD direction and the CD direction tests. Results of the tensile test are shown for <NUM> dtex (<NUM> denier) yarn fabric in TABLE <NUM>(a) and <FIG> for the MD, and Table <NUM>(b) and <FIG> for the CD.

The trapezoid tear test was conducted to determine the average tearing load of the fabric samples with a continually increasing load. This test was a measure of the tearing strength of a material or materials when a constantly increasing load was applied parallel to the length of the specimen. In nonwoven fabrics where the individual fibers are more or less randomly oriented and capable of some reorientation in the direction of the applied load, the maximum trapezoid tearing strength is reached when the resistance to further reorientation is greater than the force required to rupture one or more fibers simultaneously. The measured tearing strength of the specimen provides information on the fabrics ability to resist a continuous tear and/or formation of pills. An INSTROM™ Model <NUM> tensile tester was used and the test was run at a constant crosshead speed of <NUM>/min (<NUM> in. /min) with a grip distance of <NUM> (<NUM>"). The size of the samples were <NUM> (<NUM>") x <NUM> (<NUM>"). Results of the tear test are shown for <NUM> dtex (<NUM> denier) yarn fabric in TABLE <NUM>(a) and <FIG> for the MD, and Table <NUM>(b) and <FIG> for the CD.

The <NUM> dtex (<NUM> denier) yarn Tulle fabric was unexpectedly better at maintaining its shape and structure compared to the <NUM> dtex (<NUM> denier) yarn fabric while maintaining substantially the same openness factor, and providing surprisingly much better variability in characteristics that affect fabric stretching and wrinkle formation.

The Tulle may be formed of yarn having a denier of about <NUM> dtex (<NUM> denier) to about <NUM> dtex (<NUM> denier), preferably a <NUM> dtex (<NUM> denier) yarn, that may be monofilament or multifilament. The Tulle fabric may be made, for example, with either a <NUM>/<NUM> or a <NUM>/<NUM> yarn, where the <NUM>/<NUM> is a <NUM> dtex (<NUM> denier) yarn with <NUM> filaments while the <NUM>/<NUM> is a <NUM> dtex (<NUM> denier) yarn with a single or monofilament. The <NUM>/<NUM> monofilament yarn has a slightly smaller overall diameter and thus, when formed into a sheer, has better view through and openness factor than the <NUM>/<NUM> and may be the preferred choice. The yarn, preferably a <NUM> dtex (<NUM> denier) yarn, is made from polyester.

Tulle sheer fabrics, made in very open grid constructions, for example with a <NUM>-<NUM> gauge warp knitter, a <NUM>-<NUM> gauge knitter with every other needle removed to create a <NUM>-<NUM> gauge Tulle fabric, or where a Tulle fabric is made on a larger-gauge knitter and the fabric is finished by stretching to an about <NUM>-gauge fabric with <NUM> dtex (<NUM> denier) yarn, can provide good view-through while avoiding or reducing moiré or interference patterns with the Leno weave face sheer. The Tulle may be made on a <NUM>-gauge warp knitting machine where <NUM> wrap yarns per cm (<NUM> warp yarns per inch) are fed into the knitter, and no fill yarns are used on the warp knitter. The fabric in an embodiment is pulled out in the finishing process such that there are less than <NUM> gauge (yarns) per cm (<NUM> gauge (yarns) per inch) in the cross (width) direction (e.g., <NUM> gauge yarns per cm (<NUM> gauge yarns per inch)). In an exemplary embodiment, the Tulle for the rear support member is about <NUM> gauge (yarns) in the cross (width) direction and about <NUM> courses per cm ( <NUM> courses per inch) in the machine direction. In an alternative embodiment, the Tulle fabric with <NUM> dtex (<NUM> denier) yarn may be knitted on a <NUM>-gauge knitter without pulling during the finishing process to create a <NUM>-gauge Tulle diagonal structured fabric, a <NUM>-gauge knitter with every other needle removed to create a <NUM>-gauge Tulle diagonal structured fabric, or the like. In an embodiment, the Tulle fabric with <NUM> dtex (<NUM> denier) yarn for the rear support member is prepared on a <NUM>-gauge knitter and is finished by stretching to about a <NUM>-gauge fabric where the openness factor is about <NUM>% or greater and the openings have dimensions of about <NUM> in width and about <NUM> in length.

In one embodiment, a rear twenty-eight (<NUM>) gauge diamond grid knit sheer fabric, preferably Tulle sheer fabric, made from a dark (for example, grey or black) <NUM> dtex (<NUM> denier) yarn, preferably polyester yarn, is used, in combination with a Steiger Leno front sheer made from <NUM> dtex (<NUM> denier) yarns having <NUM>-<NUM> ypcm (<NUM>-<NUM> ypi) in the cross direction and <NUM>-<NUM> ypcm (<NUM>-<NUM> ypi) in the machine (weft) direction. In one embodiment, a Steiger Leno front sheer having rectangularly-shaped openings of about <NUM> in width and <NUM> in length is paired with a Tulle rear sheer made from <NUM> dtex (<NUM> denier) monofilament yarns prepared on a <NUM>-gauge knitter that is finished by stretching to about a <NUM> gauge fabric where the openings are about <NUM> in width and about <NUM> in length. The Leno fabric and Tulle sheer fabrics may both be dark (for example, gray or black) and/or one of the fabrics may be lighter (for example, gray vs. black), or a light color (for example, beige or white). Optionally, the rear support member fabric may be the Leno weave fabric and the front support member may be the knit Tulle fabric. The sheer fabrics, in particular a Leno weave and a Tulle knit, may be used with non-cellular vanes, multi-layered cellular vanes, and combinations thereof.

In an embodiment the front support member may have an openness factor of about as low as sixty-five percent (<NUM>%) or greater, and further may be a Steiger Leno made of <NUM> to <NUM> dtex (<NUM> to <NUM> denier) warp yarn, preferably a <NUM> dtex (<NUM> denier) yarn, and about <NUM>-<NUM> dtex (<NUM>-<NUM> denier) weft yarn, and may have about <NUM>-<NUM> ypcm (<NUM>-<NUM> ypi) in the cross (warp) and machine (weft) direction. A covering in one embodiment has a Tulle sheer made from about <NUM> dtex (<NUM> denier) to about <NUM> dtex (<NUM> denier) yarn, preferably <NUM> dtex (<NUM> denier) yarn, having an openness factor of about eighty percent (<NUM>%) or greater for one of the front or rear vertical support members and a Leno sheer fabric having an openness factor of about sixty-five percent (<NUM>%) or greater for the other of the front or rear vertical support members where in an aspect at least the rear support member is optionally darker than the front support member, and may a dark or black color. For example, the dark vertical support members may be solution dyed, dispersion dyed, or both solution and dispersion dyed with carbon black. In one aspect, one or more support members may be dark and made from carbon black pigment colored material, preferably polyester. In one embodiment, the front vertical support member may be white, off-white, and clear and/or colored with titanium pigment, or vice versa. Having vertical support members with high openness factors and dark colors may increase view-through, and enhanced visibility of the vane elements may be achieved in certain embodiments.

In one embodiment a panel may be formed of a front vertical support member and a rear vertical support member each having an openness factor greater than sixty (<NUM>%) and the panel may further have non-cellular vanes, multilayered cellular vanes, or a mixture of both vane types. In one embodiment the rear support member may be a black sheer with an openness factor of about seventy-five percent (<NUM>%) or greater, and further may be an about <NUM> to about <NUM>-gauge Tulle knit fabric, for example a <NUM>-gauge Tulle that is finished by stretching to a <NUM>-gauge sheer. The Tulle may be formed of a <NUM> dtex (<NUM> denier) to <NUM> dtex (<NUM> denier) yarn, preferably a <NUM> dtex (<NUM> denier) yarn, that may be monofilament or multifilament. In one embodiment the front support member may have an openness factor of about sixty-five percent (<NUM>%) or greater, and further may be a Steiger Leno and may have about <NUM>-<NUM> ypcm (<NUM>-<NUM> ypi) in the cross (warp) and <NUM>-<NUM> ypcm (<NUM>-<NUM> ypi) in the machine (weft) direction. The Tulle and Steiger Leno sheers with openness factors greater than sixty-five percent (<NUM>%) may be used with single layer non-cellular vanes configured in the privacy or shading orientation. In one embodiment, a covering having all non-cellular vanes, all multilayered cellular vanes, or a combination of non-cellular and cellular vanes may have a <NUM> dtex (<NUM> denier) yarn Tulle sheer having an openness factor of about eighty percent (<NUM>%) or greater for one of the front or rear vertical support members and a Leno fabric having an openness factor of about sixty-five percent (<NUM>%) or greater for the other of the front or rear vertical support members where at least the rear support member may be a dark or black color.

Those skilled in the art will recognize that the architectural covering has many applications, may be implemented in various manners and, as such is not to be limited by the foregoing embodiments and examples. Any number of the features of the different embodiments described herein may be combined into a single embodiment. Alternate embodiments are possible that have features in addition to those described herein or may have less than all the features described. Functionality may also be, in whole or in part, distributed among multiple components, in manners now known or to become known.

For the foregoing reasons, it is clear that the disclosure provides an innovative fabric design that has the potential to improve the aesthetics of currently available window coverings by reducing elongation and unsightly wrinkle formation. The fabric disclosed herein may be modified in multiple ways and applied in various technological applications. For example, although much of the discussion is directed toward the use of <NUM> dtex (<NUM> denier) yarn fabric in the covering <NUM> of <FIG> as the rear panel, this fabric may also be used as the front panel, for example.

It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications within the scope of the appended claims. While fundamental features of the invention have been shown and described in exemplary embodiments, it will be understood that omissions, substitutions, and changes in the form and details of the disclosed embodiments of the architectural covering may be made by those skilled in the art without departing from the scope of the appended claims. Moreover, the scope of the invention covers conventionally known, and future-developed variations and modifications to the components described herein as would be understood by those skilled in the art.

In the claims, the term "comprises/comprising" does not exclude the presence of other elements, features, or steps. Furthermore, although individually listed, a plurality of means, elements, or method steps may be implemented by, e.g., a single unit, element, or piece. Additionally, although individual features may be included in different claims, these may advantageously be combined, and their inclusion individually in different claims does not imply that a combination of features is not feasible and/or advantageous. In addition, singular references do not exclude a plurality. The terms "a", "an", "first", "second", etc., do not preclude a plurality. Reference signs or characters in the disclosure and/or claims are provided merely as a clarifying example and shall not be construed as limiting the scope of the claims in any way.

Claim 1:
A panel (<NUM>) having a sheer fabric, the sheer fabric comprising:
a plurality of yarns configured to form a plurality of diagonal structures each forming a diamond-shaped opening, wherein the sheer fabric has an openness factor of about seventy five percent (<NUM>%) and greater, and characterized in that
the plurality of yarns have a dtex from about <NUM> up to <NUM> (denier from about <NUM> up to <NUM>),