Patent Description:
Thermally conductive materials are used to efficiently transfer heat from an electronic component to a cooling portion such as a heat sink or a housing. As such thermally conductive materials, a thermally conductive sheet obtained by mixing silicone rubber or silicone gel with thermally conductive fillers, thermally conductive grease obtained by mixing silicone oil with thermally conductive fillers, and the like are known (for example, see Patent Literature <NUM>).

Grease has higher adhesion to an interface than a sheet, and can be formed into a thin film with a thickness down to the maximum particle size of thermally conductive fillers, and thus can achieve low thermal resistance. However, since grease is in a liquid form, it has drawbacks in that it may drip or cause pump-out. Meanwhile, a sheet has higher workability than grease, and can be fixed between an electronic component and a heat sink or a housing while being compressed, and thus is free from problems such as dripping and pump-out of grease. Methods for producing resin sheets are known from Patent Literature <NUM> and Patent Literature <NUM>. Instruments for transferring biological graft or scooping up easily deformed articles are known from Patent Literature <NUM> and Patent Literature <NUM>.

The foregoing sheet is transposed to a laminate film, for example, in the course of its production. However, since the sheet is soft and is easily deformable, it is likely to deform while being transposed, which is problematic.

The present invention has been made in view of the foregoing problems, and it is an object of the present invention to provide a method for producing a sheet in which when a to-be-transferred object with predetermined properties is transferred onto a film with a rough surface, the object is unlikely to undergo a change in shape.

That is, the present invention relates to a method for producing a sheet according to claim <NUM>.

The present invention can provide a method for producing a sheet in which when a to-be-transferred object with predetermined properties is transferred onto a film with a rough surface, the object is unlikely to undergo a change in shape.

Hereinafter, an embodiment of the present invention (hereinafter referred to as "the present embodiment") will be specifically described, but the present invention is not limited thereto, and can be modified in various ways without departing from the scope of the invention, which is defined by the appended claims. Throughout the drawings, identical elements are denoted by identical reference signs, and overlapped description will be omitted. In addition, positional relationships regarding top, down, left, right, and the like are based on the positional relationships illustrated in the drawings unless otherwise stated. Further, dimensional proportions in the drawings are not limited to those illustrated in the drawings.

A method for producing a sheet of the present embodiment includes a sheet forming step of forming a raw material sheet on a smooth surface of a first film using a resin composition containing a resin and fillers, stamping the raw material sheet into a given shape, and removing an unnecessary portion, thereby forming an adhesive sheet; a scoop-up step of sending forward a movable plate, which has a transfer belt surrounding, into a gap between the adhesive sheet and the first film, thereby scooping up the adhesive sheet onto the movable plate via the transfer belt; and an arrangement step of sending back the movable plate to arrange the adhesive sheet, which has been scooped up onto the movable plate, on a rough surface of a second film. Hereinafter, each step will be specifically described.

The sheet forming step is a step of forming a raw material sheet on a smooth surface of a first film using a resin composition containing a resin and fillers, stamping the raw material sheet into a given shape, and removing an unnecessary portion, thereby forming an adhesive sheet.

<FIG> illustrates an aspect of the sheet forming step. First, a raw material sheet <NUM> is formed on a smooth surface of a first film using a resin composition containing a resin and fillers (<FIG>). Then, the raw material sheet <NUM> is stamped into adhesive sheets <NUM> each having a given shape using a stamping machine, for example (<FIG>). Finally, an unnecessary portion <NUM> is removed so that the adhesive sheets <NUM> can be produced (<FIG>). At this time, the adhesive sheets <NUM> may be provided with cut-in portions <NUM> or may have given cutlines formed thereon.

Although <FIG> exemplarily illustrates the adhesive sheets <NUM> each having the cut-in portions <NUM> in one direction, the cut-in portions <NUM> of the adhesive sheets <NUM> may be provided in either one direction F1 or a plurality of directions F1 and F2. Each adhesive sheet <NUM> is cut along the cut-in portions <NUM> to be arranged on a second film in the arrangement step described below. That is, the cut-in portions <NUM> are the portions to be cut in the arrangement step described below.

Although <FIG> illustrates an aspect of stamping that is performed while the unnecessary portion <NUM> is present between the adjacent adhesive sheets <NUM>, the unnecessary portion <NUM> need not be provided between the adjacent adhesive sheets <NUM>, and the raw material sheet <NUM> may be stamped in a state where the adjacent adhesive sheets <NUM> are in contact with each other. This can reduce the amount of the unnecessary portion <NUM> to be discarded.

Alternatively, the scoop-up step and the arrangement step may be performed without the unnecessary portion <NUM> removed. If the unnecessary portion <NUM> is not removed, the unnecessary portion <NUM> serves the role of suppressing the deformation of the adhesive sheets <NUM>. Thus, positional displacement and deformation of the adhesive sheets <NUM> can be suppressed during the scoop-up step and the arrangement step, or during transport, for example.

Each adhesive sheet <NUM> suitably used in the production method of the present embodiment is preferably flexible and viscous. Since such an adhesive sheet <NUM> is soft and easily deformable, and is likely to stick to various objects, the adhesive sheet <NUM> is difficult to be transferred, in particular. Thus, the present invention is particularly useful. In particular, using the production method of the present invention can suppress the deformation of the adhesive sheet <NUM> and a decrease in the dimensional accuracy of the adhesive sheet <NUM> while the adhesive sheet <NUM> is transferred.

From such perspectives, the adhesive sheet of the present embodiment can have compressibility, Asker C hardness, and adhesion, determined with a ball tack tester, that are within predetermined ranges.

The compressibility of the adhesive sheet <NUM> when a load of <NUM> N is applied thereto in the thickness direction is <NUM> to <NUM>%, more preferably, <NUM> tc <NUM>%, and further preferably, <NUM> to <NUM>%. The adhesive sheet <NUM> with compressibility in such a range is relatively soft. Thus, the adhesive sheet <NUM> is difficult to be transferred from one place to another without deforming or without having decreased dimensional accuracy. Therefore, the present invention is particularly useful.

The Asker C hardness of the adhesive sheet <NUM> is preferably less than or equal to <NUM>, more preferably, <NUM> to <NUM>, and further preferably, <NUM> to <NUM>. The adhesive sheet <NUM> with Asker C hardness in such a range is relatively soft. Thus, the adhesive sheet <NUM> is difficult to be transferred from one place to another without deforming or without having decreased dimensional accuracy. Thus, the present invention is particularly useful.

The adhesion, determined with a ball tack tester, of the adhesive sheet <NUM> is <NUM> to <NUM>, more preferably, <NUM> to <NUM>, and further preferably, <NUM> to <NUM>. The adhesive sheet <NUM> with adhesion, determined with a ball tack tester, in such a range is likely to stick to the first film and the transfer belt, and thus is difficult to be transferred from one place to another without deforming or without having decreased dimensional accuracy. Thus, the present invention is particularly useful.

Examples of the adhesive sheet <NUM> used in the production method of the present embodiment include, but are not particularly limited to, a heat radiating sheet containing a resin and fillers. Hereinafter, the composition of the heat radiating sheet will be exemplarily described, but the adhesive sheet <NUM> that can be used in the present embodiment is not limited to the following heat radiating sheet.

The heat radiating sheet may contain a silicone resin and inorganic fillers, for example, and may also contain other components as appropriate.

Using a silicone resin can obtain a thermally conductive sheet that is highly flexible and highly thermally conductive. The silicone resin is preferably the one that undergoes a curing reaction through peroxide cross-linking, condensation reaction cross-linking, addition reaction cross-linking, or ultraviolet cross-linking, for example. Among them, a silicone resin that undergoes addition reaction cross-linking is more preferable. Further, a one-component reaction type or two-component addition reaction type silicone resin is preferable.

Examples of a two-component addition reaction type silicone resin include, but are not particularly limited to, a silicone resin including a first solution containing organopolysiloxane having the vinyl group at a terminal or in a side chain, and a second solution containing organopolysiloxane having two or more H-Si groups at a terminal or in a side chain. Such two-component addition reaction type silicone resin can form silicone rubber by reacting with each other and thus curing.

The inorganic fillers can be used as heat radiating fillers. Examples of such inorganic fillers include, but are not particularly limited to, aluminum oxide, magnesium oxide, boron nitride, aluminum nitride, silicon nitride, silicon carbide, metallic aluminum, and graphite. Such inorganic fillers may be used either alone or in combination.

The content of the inorganic fillers is preferably <NUM> to <NUM> volume%, or more preferably, <NUM> to <NUM> volume% with respect to the volume (<NUM> volume%) of the adhesive sheet <NUM>. The higher the content of the inorganic fillers, the higher the thermal conductivity tends to be. Meanwhile, the lower the content of the inorganic fillers, the more moderate the fluidity of the adhesive sheet <NUM>, and thus, the adhesive sheet <NUM> can be suitably used as a heat radiating sheet to be used by being compressed.

It should be noted that the adhesive sheet <NUM> may have given cutlines. The depth of the cutlines is preferably <NUM>% to <NUM>%, more preferably, <NUM>% to <NUM>%, and further preferably, <NUM>% to <NUM>% with respect to the thickness (<NUM>%) of the adhesive sheet <NUM>. With such cutlines, it is possible to, when the arranged sheet is compressed in the thickness direction, allow a force acting on the sheet in the compression direction to be released in the horizontal direction of the sheet. This can reduce a load acting on the adhesive sheet <NUM> when it is compressed, and can also provide a structure in which air is unlikely to enter during compression. For the cutlines, <CIT> may be referred to.

Next, in the method for producing the adhesive sheet <NUM> of the present embodiment, the scoop-up step of scooping up the adhesive sheet <NUM> formed on a smooth surface of a first film S1 (i.e., a transfer source) is performed. In the scoop-up step, a movable plate <NUM>, which has a transfer belt <NUM> surrounding, is sent forward into a gap between the first film S1 and the adhesive sheet <NUM>, so that the adhesive sheet <NUM> is scooped up onto the movable plate <NUM> via the transfer belt <NUM>.

<FIG> illustrate an arrangement device <NUM> used in the scoop-up step and the arrangement step. The arrangement device <NUM> includes the transfer belt <NUM>, the movable plate <NUM> having the transfer belt <NUM> surrounding, and a movement mechanism <NUM> that slidably moves the movable plate <NUM> and can adjust the speed of the sliding movement.

The transfer belt <NUM> is stretched from the side of a main surface 22a to the side of a back surface 22b of the movable plate <NUM> so as to surround the movable plate <NUM>. The transfer belt <NUM> is fixed at one end or both ends to a predetermined fixture <NUM>, for example. In such a state, the movable plate <NUM> is slid forward (F3) relative to the fixture <NUM>, so that the transfer belt <NUM> is fed from the side of the back surface 22b of the movable plate <NUM> to the side of the main surface 22a of the movable plate <NUM> (F4 in <FIG>). Along with this, the transfer belt <NUM> is pulled out from the side of the main surface 22a of the movable plate <NUM> to the side of the back surface 22b of the movable plate <NUM> (F5 in <FIG>).

In the scoop-up step, the tip end of the movable plate <NUM> is caused to gradually enter the gap between the first film S1 and the adhesive sheet <NUM> while the transfer belt <NUM> is fed from the side of the back surface 22b of the movable plate <NUM> to the side of the main surface 22a of the movable plate <NUM>. Due to the entry, the adhesive sheet <NUM> is scooped up by the tip end of the transfer belt <NUM> so as to be placed on the transfer belt <NUM> as illustrated in <FIG>. Then, the movable plate <NUM> is further slid to feed the transfer belt <NUM> so that the adhesive sheet <NUM> is completely scooped up onto the transfer belt <NUM>. During the scoop-up, friction that would deform the adhesive sheet <NUM> is not generated in the gap between the adhesive sheet <NUM> and the transfer belt <NUM>. Thus, the adhesive sheet <NUM> is scooped up onto the transfer belt <NUM> with the original shape of the adhesive sheet <NUM> on the first film S1 retained without deforming or without losing its shape.

It should be noted that in the scoop-up step, it is preferable that the movement mechanism <NUM> slidably move the movable plate <NUM> at a constant speed without changing speed. This tends to suppress the deformation of the adhesive sheet <NUM> and a decrease in the dimensional accuracy of the adhesive sheet <NUM>, which can occur during the scoop-up step, more.

The speed of sending the movable plate <NUM> forward in the scoop-up step is preferably <NUM> to <NUM>/min, more preferably, <NUM> to <NUM>/min, and further preferably, <NUM> to <NUM>/min. When the speed of sending the movable plate <NUM> forward in the scoop-up step is in such a range, the deformation of the adhesive sheet <NUM> and a decrease in the dimensional accuracy of the adhesive sheet <NUM>, which may occur when the movable plate <NUM> enters the gap between the adhesive sheet <NUM> and the first film, tend to be suppressed.

In the present embodiment, the first film and the second film are referred to as such so that the transfer source and the transfer destination of the adhesive sheet <NUM> can be distinguished from each other. A film as the transfer source, which has arranged thereon the adhesive sheet <NUM> to be scooped up, is referred to as the first film, and a film as the transfer destination, which is to have arranged thereon the adhesive sheet <NUM>, is referred to as the second film.

The surface roughness of the smooth surface of the first film is preferably <NUM> to <NUM>, more preferably, <NUM> to <NUM>, and further preferably, <NUM> to <NUM>. Forming the adhesive sheet <NUM> on the first film with such a smooth surface can obtain the adhesive sheet <NUM> that has a smooth surface in contact with the first film.

The surface roughness of the rough surface of the second film is preferably <NUM> to <NUM>, more preferably, <NUM> to <NUM>, and further preferably, <NUM> to <NUM>. Transferring the adhesive sheet <NUM> to the second film with such a rough surface will allow the adhesive sheet <NUM> and the second film to easily peel off from each other in the following step. The surface roughness of the rough surface of the second film is preferably greater than the surface roughness of the smooth surface of the first film.

Examples of the rough surface of the second film include, but are not particularly limited to, a surface subjected to embossing, engraving, or matting.

The rough surface of the second film can also be expressed as the peel strength of adhesive tape. For example, when tape 31B of Nitto Denko Corporation, which has a width of <NUM> × <NUM>, is bonded to the rough surface of the second film using a crimp roller of <NUM>, and the peel strength is measured under the conditions of <NUM>/min and <NUM>° after <NUM> hours have elapsed, the peel strength is preferably less than or equal to <NUM> N/<NUM>. It should be noted that the smoother the surface, the greater the peel strength.

The thickness of the second film is not limited to a particular thickness, but can be set to greater than or equal to <NUM>, for example. In addition, the upper limit of the thickness of the second film is not limited to a particular thickness, either, but can be set to less than or equal to <NUM>, for example.

Examples of the transfer belt <NUM> include, but are not particularly limited to, a woven fabric and a nonwoven fabric each made of fibers, and a film that is a film-form molded object. Examples of a resin forming the woven fabric, the nonwoven fabric, or the film include, but are not particularly limited to, polyester; fluorine such as Teflon (registered trademark); polyamides such as nylon, nylon <NUM>, nylon <NUM>, and aromatic nylon (aramids); polyvinyl alcohol; polyvinylidene chloride; polyvinyl chloride; polyacrylonitrile; polyolefins such as polyethylene, polypropylene, and polystyrene; polyether ester; and polyurethane. It is also possible to use a belt obtained by coating a given woven fabric, nonwoven fabric, or film with a film with excellent peelability.

The transfer belt <NUM> preferably has a composition that is unlikely to stick to the adhesive sheet <NUM>, which is flexible and viscous, from the perspective of performing the scoop-up step and the arrangement step without losing the shape of the adhesive sheet <NUM>. From such a perspective, the transfer belt <NUM> is preferably a film containing polyester, or a woven fabric containing polyester-based fibers, and is more preferably, a film containing polyester.

The surface roughness of the transfer belt <NUM> is preferably greater than or equal to <NUM>, more preferably, <NUM> to <NUM>, and further preferably, <NUM> to <NUM>. In addition, the surface roughness of the transfer belt <NUM> is preferably greater than or equal to the surface roughness of the first film S1. The surface roughness of the transfer belt <NUM> when it is a film is small, and the surface roughness of the transfer belt <NUM> when it is a woven fabric, for example, is large. When the surface roughness of the transfer belt <NUM> is in such a range, the adhesiveness of the adhesive sheet <NUM> with respect to the transfer belt <NUM> and the first film S1 can be adjusted. Thus, the deformation of the adhesive sheet <NUM> and a decrease in the dimensional accuracy of the adhesive sheet <NUM>, which would occur while the adhesive sheet <NUM> is transferred, tend to be suppressed.

The water contact angle of the transfer belt <NUM> is preferably greater than or equal to <NUM>°, more preferably, <NUM> to <NUM>°, and further preferably, <NUM> to <NUM>°. In addition, the water contact angle of the transfer belt <NUM> is preferably greater than or equal to the water contact angle of the first film S1. When the water contact angle of the transfer belt <NUM> is in such a range, the adhesiveness of the adhesive sheet <NUM> with respect to the transfer belt <NUM> and the first film S1 can be adjusted. Thus, the deformation of the adhesive sheet <NUM> and a decrease in the dimensional accuracy of the adhesive sheet <NUM>, which would occur while the adhesive sheet <NUM> is transferred, tend to be suppressed.

Examples of the movable plate <NUM> include, but are not particularly limited to, a stainless steel plate and a resin board. The movable plate <NUM> is preferably the one including an inclined portion 22c at its tip end to be sent forward. More specifically, the movable plate <NUM> preferably includes a parallel plate 22d adapted to be used in substantially parallel with the first film or the second film, and the inclined portion 22c located at its tip end (<FIG>). As in the arrangement step described below, in the production method of the present embodiment, the adhesive sheet <NUM> is arranged while the movable plate is slidably moved. For example, in the actual use, a plurality of adhesive sheets <NUM> need to be placed on a long movable plate in the sliding direction F3. If the movable plate <NUM> does not include the inclined portion 22c, the movable plate <NUM> will collide with the films. Thus, there is a limitation on the slidable range of the movable plate <NUM> (<FIG>). However, if the movable plate <NUM> includes the inclined portion 22c, collision between the movable plate <NUM> and the films S1 and S2 can be avoided. Thus, the slidable length of the movable plate <NUM> can be increased.

The angle θ of the inclined portion 22c with respect to the parallel plate 22d is preferably <NUM> to <NUM>°, and more preferably, <NUM> to <NUM>°. When the angle of the inclined portion 22c is in such a range, the deformation of the adhesive sheet <NUM> and a decrease in the dimensional accuracy of the adhesive sheet <NUM>, which would occur during the scoop-up step and the arrangement step, tend to be suppressed.

The thickness of the movable plate <NUM> is preferably <NUM> to <NUM>, and more preferably, <NUM> to <NUM>. When the thickness of the movable plate <NUM> is in such a range, it will be easier for the movable plate <NUM> to enter a gap underneath the adhesive sheet <NUM>. Thus, the deformation of the adhesive sheet <NUM> and a decrease in the dimensional accuracy of the adhesive sheet <NUM>, which would occur during the scoop-up step and the arrangement step, tend to be suppressed.

A corner R of the tip end of a tip end side 22e, which is adapted to be sent forward, of the movable plate <NUM> is preferably <NUM> to <NUM>, and more preferably, <NUM> to <NUM>. When the corner R of the tip end of the tip end side 22e is in such a range, it will be easier for the movable plate <NUM> to enter a gap underneath the adhesive sheet <NUM>. Thus, the deformation of the adhesive sheet <NUM> and a decrease in the dimensional accuracy of the adhesive sheet <NUM>, which would occur during the scoop-up step and the arrangement step, tend to be suppressed.

A method of fixing opposite end portions 21a and 21b of the transfer belt <NUM> using the fixture <NUM> is not limited to a particular method. <FIG> is a schematic cross-sectional view illustrating an aspect of the fixture <NUM>. The fixture <NUM> adapted to fix the opposite end portions 21a and 21b of the transfer belt <NUM> is not limited to a particular fixture. For example, it is possible to use two rod-like jigs 24a and 24b adapted to hold the opposite end portions 21a and 21b of the transfer belt <NUM> therebetween. The two rod-like jigs 24a and 24b can be securely coupled together using a fastener such as a bolt and nut or a screw (not illustrated). Accordingly, the opposite end portions 21a and 21b can be held. The jigs 24a and 24b may respectively have formed therein a recess portion and a projecting portion that can be fitted together while meshing with the transfer belt <NUM>. Accordingly, the transfer belt <NUM> can be fixed more securely.

Further, the fixture <NUM> may be provided with a tension adjustment portion 24c adapted to adjust the tension of the transfer belt <NUM>. Examples of the tension adjustment portion 24c include a portion adapted to allow the jigs 24a and 24b to be held while being fixed at a given angle of rotation, and an elastic body adapted to pull the end portions 21a and 21b by adding a constant weight thereto. When the movable plate <NUM> is slidably moved repeatedly in the scoop-up step and the arrangement step, the transfer belt <NUM> may gradually undergo ductile deformation and thus may warp. When the transfer belt <NUM> has warped to more than a given level, the adhesive sheet <NUM> will be more likely to deform or have decreased dimensional accuracy in the scoop-up step and the arrangement step. However, providing the tension adjustment portion 24c allows the scoop-up step and the arrangement step to be performed in succession without the need for adjustments such as the replacement of the transfer belt.

Finally, the arrangement step is performed in which the movable plate <NUM> is sent back so that the adhesive sheet <NUM>, which has been scooped up onto the movable plate <NUM>, is arranged on the second film S2.

<FIG> is a schematic view illustrating the arrangement step. In the arrangement step, the movable plate <NUM> is sent back in a direction F7 while the transfer belt <NUM> is fed back from the side of the main surface 22a of the movable plate <NUM> to the side of the back surface 22b of the movable plate <NUM>. For example, when the movable plate <NUM> is sent back backward (F7) relative to the fixture <NUM> in a state where the transfer belt <NUM> is fixed at one end or both ends to the predetermined fixture <NUM>, the transfer belt <NUM> is pulled back from the side of the main surface 22a of the movable plate <NUM> to the side of the back surface 22b of the movable plate <NUM> (F7 in <FIG>). Accordingly, the adhesive sheet <NUM> is sent forward onto the second film S2 from the tip end of the transfer belt <NUM>. In such a case, no friction is generated between the adhesive sheet <NUM> and the second film S2. Thus, the adhesive sheet <NUM> can be arranged on the second film S2 without deforming or without having decreased dimensional accuracy.

The send-back speed of the movable plate <NUM> in the arrangement step is preferably <NUM> to <NUM>/min, more preferably, <NUM> to <NUM>/min, and further preferably, <NUM> to <NUM>/min. When the send-back speed of the movable plate <NUM> while the adhesive sheet <NUM> is in contact with the second film S2 is in such a range, the deformation of the adhesive sheet <NUM> and a decrease in the dimensional accuracy of the adhesive sheet <NUM>, which would occur when the adhesive sheet <NUM> contacts the second film S2, tend to be suppressed.

Hereinafter, the present invention will be described more specifically by way of examples and comparative examples. Examples <NUM>, <NUM> and <NUM> are reference examples not according to the invention.

A composition was obtained by mixing a two-component addition reaction type silicone resin and inorganic fillers. The obtained composition was molded into a sheet form using the doctor blade method, and was then thermally cured so that a raw material sheet was obtained on a first film. The thus obtained raw material sheet was cut as illustrated in <FIG> so that sheets with cut-in portions were obtained. It should be noted that each sheet has a rectangular shape with a size of <NUM> (shorter side) × <NUM> (longer side), and has cut-in portions at intervals of <NUM> in the direction parallel with the shorter side. That is, the cut-in portions were formed so that <NUM> strip-like sheets each having a size of <NUM> × <NUM> would be formed after the arrangement step. The physical properties of each adhesive sheet are illustrated in Table <NUM>, and the measurement method therefor is described below.

Regarding the compressibility of each adhesive sheet, after a spacer was stamped into sheets each having a size of <NUM> × <NUM>, the amount of compressive deformation of each sheet when a load of <NUM> N was applied thereto in the thickness direction was measured using a table-top testing machine (EZ-LX manufactured by SHIMADZU CORPORATION), and then, the compressibility was calculated with the following expression.

The Asker C hardness of each adhesive sheet was measured using a spring-type hardness tester of type Asker C compliant with SRIS0101 at <NUM> ("Asker rubber hardness tester, type C" manufactured by KOBUNSHI KEIKI CO.

The ball tack of each adhesive sheet was measured in compliance with JIS Z <NUM>.

The scoop-up step was performed as illustrated in <FIG>, using a PET film (with a surface roughness of <NUM> and a contact angle of <NUM>°) as the transfer belt. It should be noted that the thickness of the movable plate was set to <NUM>, the angle of the inclined portion was set to <NUM>°, and the send-forward speed was set to <NUM>/min.

The arrangement step was performed as illustrated in <FIG>, and the adhesive sheets were separated along the cut-in portions so that <NUM> strips were arranged on the second film. It should be noted that the pull-back speed and the send-back speed were set to <NUM>/min.

Each evaluation was performed as in Example <NUM> except that the conditions were changed to those illustrated in Table <NUM>.

The width dimensions of the <NUM> strips obtained through the foregoing series of steps were measured, and the mean value Ave thereof was calculated. Then, the dimensions of each sheet arranged on the second film were evaluated based on the following criteria regarding the difference between the target width (<NUM>) of the strip dimensions (length <NUM> × width <NUM>) and the mean value Ave.

The appearance of the <NUM> strips obtained through the foregoing series of steps was confirmed, and was evaluated based on the following evaluation criteria.

Claim 1:
A method for producing a sheet, comprising:
a sheet forming step of forming a raw material sheet (<NUM>) on a smooth surface of a first film (S1) by using a resin composition containing a resin and fillers, stamping the raw material sheet (<NUM>) into a given shape, and removing an unnecessary portion (<NUM>), thereby forming an adhesive sheet (<NUM>), wherein a compressibility of the sheet when a load of <NUM> N is applied to the sheet in a thickness direction is <NUM> to <NUM>%, and wherein an adhesion of the sheet, determined with a ball tack tester and measured in compliance with JIS Z <NUM>, is <NUM> to <NUM>;
a scoop-up step of sending forward a movable plate (<NUM>) that has a transfer belt (<NUM>) surrounding the movable plate (<NUM>) into a gap between the adhesive sheet (<NUM>) and the first film (S1), thereby scooping up the adhesive sheet (<NUM>) onto the movable plate (<NUM>) via the transfer belt (<NUM>); and
an arrangement step of sending back the movable plate (<NUM>) to arrange on a rough surface of a second film (S2) the adhesive sheet (<NUM>) that has been scooped up onto the movable plate (<NUM>),
wherein:
the scoop-up step comprises sending forward the movable plate (<NUM>) while feeding the transfer belt (<NUM>) to a side of a main surface (22a) of the movable plate (<NUM>) from a side of a back surface (22b) of the movable plate (<NUM>), and
the arrangement step comprises sending back the movable plate (<NUM>) while feeding back the transfer belt (<NUM>) to the side of the back surface (22b) of the movable plate (<NUM>) from the side of the main surface (22a) of the movable plate (<NUM>),
wherein compressibility of the sheet is determined by measuring the amount of compressive deformation of each sheet in the thickness direction and thereafter calculating the compressibility by dividing the amount of compressive deformation by the original thickness.