Patent Publication Number: US-2021178711-A1

Title: Wafer holder band for mold injection process

Description:
TECHNICAL FIELD 
     The present disclosure relates generally to optical articles and more particularly, but without limitation, to the manufacture of a lens. 
     BACKGROUND 
     Optical articles, such as lenses, are typically made from functional wafers. A wafer may include a center layer of soft thermoplastic material (e.g., soft thermoplastic layer or soft adhesive layer) as it offers certain advantages, such as soft polymer segment, ductility, and chemical compatibility during the formation of the wafer and the optical article. During formation of an optical article, the wafer may be subject to one or more various manufacturing processes. For example, a flat wafer is typically transformed (e.g., thermoformed) from a flat circular wafer to a concave dome-shaped functional wafer to correspond to a base curve of the optical article. As another example, an injection overmolding process may be performed on the thermoformed functional wafer to produce corrective or non-corrective eyeglass lenses. 
     During formation of an optical article, several complications arise based on use the soft thermoplastic layer of the wafer. For example, complications may arise during the thermoforming process, the injection molding process, or both. To illustrate, to maintain the desired ductility of the wafer, the soft thermoplastic layer of the wafer typically has a glass transition temperature below that of the injection molding temperature. During thermoforming, elevated temperature, pressure, etc., may fluidize the thermoplastic layer and result in outflow (e.g., edge bleeding) of the soft thermoplastic layer. Additionally, or alternatively, during injection molding, the soft thermoplastic layer may become fluid from the temperature of an injection material and result in outflow (e.g., edge bleeding) of the soft thermoplastic layer. This edge bleeding creates unwanted contamination of an insert and/or a mold cavity and/or between the outer side surface of the insert and the mold cavity walls. The contamination can reduce production yields and increase down time for mold cleaning. Additionally, the contamination can lead to imperfections in subsequent lens formation, such as non-uniform thickness of the soft thermoplastic layer that results in optical distortions or cosmetic issues in the optical article (e.g., a lens). Some conventional approaches to prevent edge bleeding have included specialized wafer designs in which outer layers have a larger diameter than the soft, central layer to prevent the central layer from bleeding into the mold cavity. However, such wafer geometry is difficult to produce on a large scale and the soft layer is still visible after injection molding. Other conventional approaches have attempted to seal a wafer edge via thermal or chemical means, or using a special wafer edge cutting design. However, such techniques are often complex, reduce a quality of a final lens product (e.g., the thermal or chemical means can deteriorate materials of the wafer), and increase production time (e.g., sealing the wafer edge or the special wafer edge cutting design adds time and cost to manufacturing). Accordingly, such solutions offer little help to reduce manufacturing time and produce lenses with undesirable cosmetic properties. 
     SUMMARY 
     The present disclosure is generally related to systems, devices, and methods for manufacturing an optical article and an apparatuses including the optical article. For example, a device (or an apparatus) for manufacturing an optical article may include a containment band that is operable with a functional wafer. The containment band may be configured to reduce or prevent insert and/or mold cavity contamination from a soft thermoplastic layer of the functional wafer during processing, such as thermoforming or injection molding. To illustrate, the containment band may include an annular base and one or more sidewalls. The annular base may define a first opening and the one or more sidewalls may extend from the annular base and surround at least a portion of the first opening. In some implementations, the first opening is configured to receive and hold the wafer, the one or more sidewalls may include a rib or rim configured to aid in retaining a wafer in position (e.g., between the annular base and the rib/rim), or a combination thereof. During processing of the wafer, the containment band may capture or retain potential outflow of material from the soft thermoplastic layer to mitigate contamination, such as potential contamination during the injection molding process. In some implementations, the one or more sidewalls may define one or more second openings and/or the containment band includes a tab extending from the annular base or a sidewall. The tab may enable placement of the containment band and wafer into a mold cavity in a desired or predetermined orientation. During formation of the optical article, a first portion of the wafer can be in contact with the one or more sidewalls while each of the one or more second openings is configured to enable passage of an injection material to form a semi-finished (SF) lens product. In this manner, the containment band enables injection of molten material injected and reduced or prevents contamination of outflow material. 
     The systems, apparatuses, and methods described herein advantageously include or use a containment band with a functional wafer that may bleed-out any layers that are fluidized by the high temperatures and pressures experienced inside the product cavities during injection molding. To illustrate, the containment band is configured to reduce or prevent the bleeding out (e.g., oozing out) of a thermoplastic optically functional layer (e.g., photochromic layer) of a multilayered laminate wafer construction during injection molding. The containment band is able to be easily manufactured (e.g., via a 3D printing process, an injection molding process, or other means) with minimal cost and can be coupled to or assembled with a wafer manually or by a simple mechanical means without significantly increasing production complexity or time. Additionally, or alternatively, the containment band does not need to be removed after injection molding and may be included in a final semi-finished (SF) lens product such that use of the containment band does not increase production time, cost, or complexity. Thus, systems, apparatuses, and methods described herein enable production of optical articles with minimized risk of contamination of the mold cavity and/or without altering wafer geometry or sacrificing the cosmetic appearance of the lenses. 
     In some of the foregoing implementations of the present apparatuses includes a containment band for use in making an article. The containment band includes an annular base that defines a first opening. In some implementations, the first opening is configured to receive at least a portion of a functional wafer. The containment band also includes one or more sidewalls that project a first direction from and surround at least a portion of the first opening, the one or more sidewalls defining one or more second openings. During formation of the article, a first portion of the functional wafer is in contact with the one or more sidewalls and each of the one or more second openings is configured to enable passage of an injection material to form the article. 
     In some implementations of the present apparatuses, the containment band include an alignment member (e.g., a tab) that extends from the annular base in a second direction that is away from the first opening. Additionally, or alternatively, the one or more sidewalls include an inner surface that faces the first opening and an outer surface that is opposite the inner surface. In one or more implementations, the one or sidewalls include multiple sidewalls. In some implementations, the containment band includes a securement member (e.g., a rib) extending from at least a portion of the inner surface of at least one sidewall of the one or more sidewalls. 
     In some implementations of the present apparatuses, the annular base includes a first surface that defines the first opening and a second surface that defines a periphery of the annular base. In some such implementations, an alignment member (e.g., a tab) extends from the second surface. Additionally, or alternatively, the one or more sidewalls may be positioned proximate to the second surface and extend from the annular base in a direction that is substantially perpendicular to the base. 
     In some implementations of the present apparatuses, an angle between the sidewall and the annular base is between 80 and 150 degrees, an outer diameter of the annular base that is between 50 to 150 mm, and a combination thereof. Additionally, or alternatively, the containment band may include a height of the sidewall, measured from a top surface of the annular base, which is between 1 to 5 millimeters (mm). 
     In some of the foregoing implementations of the present apparatuses (e.g., optical articles—glasses, lenses, etc.), an optical article includes a wafer and a containment band for preventing mold contamination during manufacture of the optical article. Wafer may include one or more layers of thermoplastic matrix material. In some implementations, the containment band includes a base having a periphery and a sidewall extending from the periphery of the base to contact the wafer. In some such implementations, the sidewall defines one or more openings occupied by mold material. The sidewall may surround a majority of the wafer. In some of the foregoing implementations, the wafer includes at least one thermoplastic layer and the wafer is disposed within the periphery of the base and in contact with an inner surface of the sidewall. Additionally, or alternatively, the containment band includes a thermoplastic polymer having a higher glass transition temperature than at least one thermoplastic layer of the wafer. 
     In some of the foregoing implementations of the present methods (e.g., of forming a wafer an optical article), a method includes disposing a wafer into a mold cavity. The wafer has a containment band coupled to and covering an outer periphery of the wafer. The method also includes injecting a moldable material into the mold cavity. In some such implementations, the method may also include inserting the wafer into the containment band such that the containment band is disposed around at least a majority of the outer periphery of the wafer. 
     In some implementations of the present methods, the method further includes setting the moldable material to form a semi-finished lens including the wafer, the containment band, and the moldable material. Additionally, or alternatively, the method may also include forming a finished lens from the semi-finished lens by removing at least a portion of the containment band from being coupled to the wafer. 
     As used herein, various terminology is for the purpose of describing particular implementations only and is not intended to be limiting of implementations. For example, as used herein, an ordinal term (e.g., “first,” “second,” “third,” etc.) used to modify an element, such as a structure, a component, an operation, etc., does not by itself indicate any priority or order of the element with respect to another element, but rather merely distinguishes the element from another element having a same name (but for use of the ordinal term). The term “coupled” is defined as connected, although not necessarily directly, and not necessarily mechanically; two items that are “coupled” may be unitary with each other. The terms “a” and “an” are defined as one or more unless this disclosure explicitly requires otherwise. 
     The term “about” as used herein can allow for a degree of variability in a value or range, for example, within 10%, within 5%, or within 1% of a stated value or of a stated limit of a range, and includes the exact stated value or range. The term “substantially” is defined as largely but not necessarily wholly what is specified (and includes what is specified; e.g., substantially 90 degrees includes 90 degrees and substantially parallel includes parallel), as understood by a person of ordinary skill in the art. In any disclosed implementation, the term “substantially” may be substituted with “within [a percentage] of” what is specified, where the percentage includes 0.1, 1, or 5 percent; and the term “approximately” may be substituted with “within 10 percent of” what is specified. The statement “substantially X to Y” has the same meaning as “substantially X to substantially Y,” unless indicated otherwise. Likewise, the statement “substantially X, Y, or substantially Z” has the same meaning as “substantially X, substantially Y, or substantially Z,” unless indicated otherwise. The phrase “and/or” means and or. To illustrate, A, B, and/or C includes: A alone, B alone, C alone, a combination of A and B, a combination of A and C, a combination of B and C, or a combination of A, B, and C. In other words, “and/or” operates as an inclusive or. Similarly, the phrase “A, B, C, or a combination thereof” or “A, B, C, or any combination thereof” includes: A alone, B alone, C alone, a combination of A and B, a combination of A and C, a combination of B and C, or a combination of A, B, and C. 
     Throughout this document, values expressed in a range format should be interpreted in a flexible manner to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a range of “about 0.1% to about 5%” or “about 0.1% to 5%” should be interpreted to include not just about 0.1% to about 5%, but also the individual values (e.g., 1%, 2%, 3%, and 4%) and the sub-ranges (e.g., 0.1% to 0.5%, 1.1% to 2.2%, 3.3% to 4.4%) within the indicated range. 
     The terms “comprise” (and any form of comprise, such as “comprises” and “comprising”), “have” (and any form of have, such as “has” and “having”), and “include” (and any form of include, such as “includes” and “including”). As a result, an apparatus that “comprises,” “has,” or “includes” one or more elements possesses those one or more elements, but is not limited to possessing only those one or more elements. Likewise, a method that “comprises,” “has,” or “includes” one or more steps possesses those one or more steps, but is not limited to possessing only those one or more steps. 
     Any implementation of any of the systems, methods, and article of manufacture can consist of or consist essentially of—rather than comprise/have/include—any of the described steps, elements, and/or features. Thus, in any of the claims, the term “consisting of” or “consisting essentially of” can be substituted for any of the open-ended linking verbs recited above, in order to change the scope of a given claim from what it would otherwise be using the open-ended linking verb. Additionally, the term “wherein” may be used interchangeably with “where”. 
     Further, a device or system that is configured in a certain way is configured in at least that way, but it can also be configured in other ways than those specifically described. The feature or features of one implementation may be applied to other implementations, even though not described or illustrated, unless expressly prohibited by this disclosure or the nature of the implementations. 
     Some details associated with the implementations are described above, and others are described below. Other implementations, advantages, and features of the present disclosure will become apparent after review of the entire application, including the following sections: Brief Description of the Drawings, Detailed Description, and the Claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The following drawings illustrate by way of example and not limitation. For the sake of brevity and clarity, every feature of a given structure is not always labeled in every figure in which that structure appears. Identical reference numbers do not necessarily indicate an identical structure. Rather, the same reference number may be used to indicate a similar feature or a feature with similar functionality, as may non-identical reference numbers. 
         FIG. 1  is a diagram that illustrates an example of stages of a process of an optical system for manufacturing an optical article. 
         FIG. 2A  is a perspective view of an example of a containment band. 
         FIG. 2B  is a sectional view of an example of the containment band of  FIG. 2A . 
         FIG. 2C  is a top view of an example of a wafer coupled to the containment band of  FIG. 2A . 
         FIG. 2D  is a sectional side view of the wafer and containment band of  FIG. 2A . 
         FIG. 3  is a perspective view of another example of a containment band. 
         FIG. 4  is a perspective view of another example of a containment band. 
         FIG. 5A  is a sectional view of another example of a containment band. 
         FIG. 5B  is a sectional side view of the wafer and containment band of  FIG. 5A . 
         FIG. 6  is a flowchart illustrating an example of a method of forming an optical article. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIG. 1 , a diagram of illustrative stages of manufacturing an optical article is shown. For example, a system  100  may be configured to perform the stages of manufacturing the optical article, such as an optical lens (e.g., a semi-finished (SF) lens product). System  100  may be configured to produce a non-contaminating optical wafer for use in manufacture of the optical article, such as a polarized or photochromic plastic lens. 
     At a first stage  101 , a containment band  110  and a wafer  130  may be provided or formed. Wafer  130  (e.g., functional polycarbonate wafer) may include one or more thermoplastic layers and have an outer edge  131  (e.g., a sidewall) that extends between a first surface (e.g., an upper surface) and a second surface (e.g., a lower surface) that is opposite the first surface. For example, wafer  130  may include a thermoplastic layer (e.g., thermoplastic polyurethane (TPU) (e.g., amorphous TPU, Tecoflex EG85A, Tecoflex EG80A, Estane ALR E77A-V, Estane AG 8451, Estane VSN F5000, or the like) or semi-crystalline Polyether-block-polyamides (PEBA) (e.g., Pebax 5533, Pebax 4533, Pebax 4033, Pellethane 80A or the like), a soft adhesive layer, or any other thermoplastic elastomeric material, that is interposed between two outer layers. The two outer layers may each include a transparent polycarbonate film (e.g., Lexan PC, and/or the like) that has a higher glass transition temperature (or melt temperature) than the thermoplastic layer. In some implementations, the thermoplastic layer (e.g., a soft thermoplastic layer or a soft adhesive layer) may include one or more additives, such as an optical additive and/or a process additive (e.g., photochromic dye, polarizing dye, tint dye, dye absorbers of selective wavelengths, electrochromic dyes, stabilizers, flow modifiers, and/or the like). The soft thermoplastic layer may be configured to deform and flow under typical molding pressures and temperatures. Wafer  130  may have an oval shape, circular shape (e.g., circular disk), or other shape that can be flat or convex (e.g., semi-spherical dome shape) to correspond to a desired base curve of the optical article (e.g.,  102 ). In some implementations, wafer  130  may be formed or cut from a laminate (e.g., a stack) that includes the thermoplastic layer positioned between the two outer layers. Additionally, or alternatively, thermoforming may be performed on wafer  130  at first stage  101 . 
     Containment band  110  (also referred to as a band) is configured to secure wafer  130  during one or more manufacturing process, such as coating process, as described further herein with reference to stage  118 . Containment band  110  includes an annular base  112 , such as a ring, that defines a first opening  104 . Containment band  110  also includes one or more sidewalls  120  that project from and surround at least a portion of first opening  104 . For example, the one or more sidewalls  120  project from annular base  112  in a first direction. In some implementations, the one or more sidewalls  120  defining one or more second openings. For example, the one or more second openings may include or corresponds to gaps (e.g., spaces) between ends of the one or more sidewalls  120 . Containment band  110  may include one or more additional features, such as an alignment member (e.g., a tab) extending from annular base  112 , a securement member (e.g., a rim) extending from at least a portion of the inner surface of at least one sidewall (e.g.,  112 ), or a combination thereof, as illustrative, non-limiting examples. Examples, of containment band  110  are described further herein at least with reference to  FIGS. 2A, 2B, 2C, 2D, 3, 4, and 5A-5B . 
     In some implementations, containment band  110  may include one or more additional features  115 . For example, one or more, features  115  may include or correspond to a tab, notch, second opening, rib, groove, and/or the like. Examples of one or more features  115  are described further herein at least with reference to  FIGS. 2A, 2C, 3, 4, 5A and 5B . Features  115  may assist during the manufacturing process such as, for example, by facilitating coupling between containment band and wafer  130 , enabling contamination free injection molding of the wafer, alignment member recessed into the annual base  112 , or the like. 
     Containment band  110  is configured to be coupled to wafer  130  (as indicated by arrows  113 ). For example, containment band  110  may be coupled to wafer  130  such that a first portion of wafer  130  is in contact with the one or more sidewalls  120 , a second portion of wafer  130  is in contact with annular base  112 , or a combination thereof. In implementations where containment band  110  includes the one or more second openings, each of the one or more second openings may be configured to enable passage of an injection material during formation of an article, such as an optical article. 
     Containment band  110  may be circular, elliptical, or otherwise shaped to secure wafer  130  as described herein. For example, containment band  110  may surround a portion (up to and including an entirety) of wafer  130  to prevent the soft thermoplastic layer of wafer  130  from oozing out of the wafer (e.g., edge bleed). In such implementations, containment band  110  may include any suitable material that will remain rigid when subjected to pressure and temperatures commonly associated with injection molding processes. For example, containment band  110  may include a semi-transparent or transparent polymer (e.g., nylon, polycarbonate, polyacrylates, polyesters, polyethers, acrylates (e.g., PMMA), acrylonitrile butadiene styrene, copolymers, or the like), metal, ceramic, any other suitable material, or combination thereof. In some implementations, containment band  110  includes a polymer (e.g., polycarbonate) that can be produced by injection molding, 3D printing, or the like. In this way, containment band  110  may be inexpensively and quickly mass produced thereby allowing containment band  110  to be implemented in existing optical article manufacturing process with only a nominal increase in cost and manufacturing time. 
     Containment band  110  and wafer  130  are provided from first stage  101  to a second stage  108  indicated by arrow  106 . At second stage  108 , containment band  110  and wafer  130  are coupled. For example, containment band  110  may surround at least a portion of wafer  130  to cover outer edge  131  or perimeter of wafer  130 . Containment band  110  and wafer  130  may be coupled together in any suitable manner such as, for example, via friction, an adhesive layer, or one or more additional components, or a combination thereof. 
     Containment band  110  and wafer  130  are provided from second stage  108  to a third stage  118  as indicated by arrow  119 . At third stage  118 , containment band  110  and wafer  130  may be disposed within a mold device  140  configured for an injection molding processes. 
     Mold device  140  may include a convex insert  144 , a concave insert  146 , and a mold block  152  that are movable relative to one another between an open configuration (e.g., shown at stage  158 ) and a closed configuration (e.g., shown at third stage  118 ) to define a cavity  142 . To illustrate, mold inserts  144 ,  146  may be disposed within a space defined by sidewalls  154  of mold device (e.g., of mold block  152 ). The surfaces of the inserts  144 ,  146  and the sidewall  154  of the mold device  152  may cooperate to define cavity  142 . Containment band  110  and wafer  130  may be disposed within cavity  142  and a moldable material  148  may be injected onto wafer  130  to form an article, such as a semi-finished lens product. Although mold device  140  defines a single cavity  142 , the mold device may include multiple pairs of inserts (e.g.,  144  and  146 ) configured to be inserted within respective sidewalls of the mold block that each cooperate to define a cavity (e.g.,  142 ) configured to receive a respective containment band (e.g.,  110 ) and wafer (e.g.,  130 ). In some implementations, containment band  110  surrounds wafer  130  and is positioned within cavity  142  of mold device  140  such that the containment band  110  the wafer  130  is secured within cavity  142  and contacts a surface of convex insert  144 , concave insert  146 , and/or sidewall  154  of mold block  152 . In this way, wafer  130  is prevented from moving or shifting during an injection process which allows for high-quality optics in the final optical article (e.g., lens). In some implementations, containment band  110  may include an alignment member (e.g., a tab) that is configured to be received in a corresponding recess or cavity of mold device  140  to enable proper positioning and/or alignment of containment band  110  and wafer  130  within cavity  142  of mold device  140 . 
     Insert  146  and insert  144  may be sized and shaped such that when they are coupled together, the mold insert  144  and the mold insert  146  cooperate to define cavity  142  that corresponds to a desired shape and thickness of optical article  102 . For example, mold insert  144  may include a convex, concave, or plano surface and mold insert  146  may include a convex, concave, or plano surface having a same, similar, different, or larger or smaller, base curve (e.g., radius of curvature) to the curved surface of the mold insert  144 . Insert  146  and insert  144  may define surfaces configured to accept a corresponding concave functional wafer (e.g.,  130 ) having a base curve greater than, equal to, or between any of the following: 0.25, 1.75, 3.00, 4.00, 4.50, 5.50, 6.00, 6.50, 7.25, 8.00, or 8.50. 
     As shown, moldable material  148  (e.g., a matrix or substrate material) is injected into cavity  142  of mold device  140  while wafer  130  is positioned within the cavity. Moldable material  148  may include a transparent or semi-transparent thermoplastic material, such as polycarbonate, thermoplastic urethane, polyacrylate, polyester, copolyester, polymethacrylate, poly(methyl methacrylate), polystyrene, polyamide, polysulfone, polyphenylsulfone, polyetherimide, polypentene, polyolefin, ionomer, ethylene methacrylic acid, cyclic olefin copolymer, acrylonitrile, styrene maleic anhydride, a copolymer thereof, or a derivative or mixture thereof. Moldable material  148  may be heated, into a molten state, and injected onto wafer  130  in the molten state such that the moldable material becomes fuse-bonded to the wafer and takes the shape of cavity  142 . For example, moldable material  148  is injected into cavity  142  at a high temperature (up to 300° C.) and high pressure (500-30,000 psi) to from optical article  102 . Injection of moldable material  148  onto wafer  130  may cause the soft thermoplastic layer of the wafer to transform into a low viscous (e.g., liquid) state. For example, moldable material  148  may be injected at a temperature that is much greater than a glass transition temperature of the soft thermoplastic layer such that the inner layer becomes fluid (e.g., a low viscous liquid) and is capable of flowing out under pressure (i.e., oozing out) from wafer  130  onto a surface that defines cavity  142 . In such implementations, the soft thermoplastic layer of wafer  130  may be contained by containment band  110  such that the fluid material does not contaminate (e.g., contact) convex insert  144 , concave insert  146 , mold block  152 , and/or other components of mold device  140 . Likewise, containment band  110  may prevent liquefied material from flowing between an outer side surface of inserts (e.g.,  144 ,  146 ) and the sidewall(s) (e.g.,  154 ) of mold block  152 . Accordingly, containment band  110  may reduce or eliminate contamination of one or more components (e.g., mold insert  146 , mold insert  144 , mold block  152 ) of system  100 , thus decreasing manufacturing time of optical article. 
     Wafer  130 , containment band  110 , and moldable material  148  are provided to a fourth stage  158  as indicated by an arrow  159 . At fourth stage  158 , wafer  130 , containment band  110 , and moldable material  148  are removed from cavity  142 . For example, after moldable material  148  solidifies in cavity  142 , receiver  144  and/or insert  146  can be moved to an open configuration and optical article may be removed from mold device  140 . 
     In some implementations, one or more finishing processes may, but need not be, performed on to wafer  130  and moldable material  148  to form optical article  102 , such as a lens, glasses, goggles, other form of eyewear, etc. For example, some in some implementations, optical article  102  is proved to a fifth stage  168  as indicated by an arrow  169 . At fifth stage  168 , a finishing process such as, for example, coating, stamping, printing, grinding, polishing, buffing, etching, edging, machining or other process may occur to produce a finished optical article. As shown, wafer  130 , moldable material  148 , and containment band  110  are post processed (e.g., edged) to form a shaped lens, however, in other implementations, article  102  will contain a similar shape as cavity  142  (e.g., rounded). In some implementations, containment band  110  may be part of the finished lens, while in other implementations, the containment band may be removed from optical article  102  during formation of the finished lens. For example, containment band  110  may be removed from optical article, by a grinding process, a chemical process (e.g., containment band may be made of a releasable material such as for removal and reuse or recycle), or other known process. As shown, optical article  102  includes containment band  110 , wafer  130 , and solidified moldable material (e.g.,  148 ). 
     In some implementations, system  100  includes a control device (not shown) which includes a processor and a memory. Memory may include read only memory (ROM) devices (e.g., programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), optical storage, or the like), random-access memory (RAM) devices (e.g., synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous dynamic RAM (SDRAM), or the like), one or more HDDs, flash memory devices, SSDs, other devices configured to store data in a persistent or non-persistent state, or a combination of different memory devices. Memory may store instructions that, when executed by processor, cause processor to perform the operations described herein. Although described as including processor, in other implementations, control device can include application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), very large scale integrated (VLSI) circuits, or other circuitry. Additionally, control device may include an interface, such as a wired interface or a wireless interface, to enable communication with one or more components of system  100 . Control device may also include a user interface to enable a user to control operations of system  100 . 
     The control device may be configured to control operations of one or more components of system  100 . For example, control device may be configured to control one or more of laminate equipment, a cutter device or tool to cut wafers from a laminate, a thermoforming device, mold device  140 , formation of wafer  130 , the formation of containment band  110 , and/or coupling of wafer  130  and containment band  110 . To illustrate, control device may be coupled or connected to a 3D printer, injection molding device, or another manufacturing component, or a combination thereof, to communicate with the component to form containment band  110 . As another example, the control device may control operation of one or more actuators (not shown) to cause movement (e.g., translation, rotation, and/or the like) of mold device  140 . 
     Although described as a single control device (e.g., a single processor), in other implementations, the control device may include multiple devices or processors (e.g., a processor system) that perform the control operations. For example, the control device may be a distributed system with multiple processors that each perform some of the control operations described herein. To further illustrate, a first device or processor may control formation of containment band  110  and a second device or processor may control operation of mold device  140 . 
     In some implementations, containment band  110  is used for making optical article  102 . For example, containment band  110  may include an annular base  112  that defines a first opening  104  and one or more sidewalls  120  that project from and surround at least a portion of the first opening. In some implementations, one or more sidewalls  120  may define one or more second openings and during formation of optical article  102 , a first portion of wafer  130  may be in contact with one or more sidewalls  120  and each of the one or more second openings are configured enable passage of injection material  148  to form optical article  102 . 
     Referring now to  FIGS. 2A-2D  aspects of a containment band  210 , for use in manufacture of an optical article, are shown. For example,  FIG. 2A  shows a perspective view of a first example of containment band  210 ,  FIG. 2B  shows a sectional view of containment band  210 ,  FIG. 2C  shows a top view of containment band  210  coupled to a wafer  230 , and  FIG. 2D  shows a sectional side view of wafer  230  and containment band  210 . 
     Containment band  210  and wafer  230  may include or correspond to containment band  110  and wafer  130 , respectively. For example, containment band  210  may be configured to prevent wafer  230  from contaminating a cavity (e.g.,  142 ) of a mold (e.g.,  140 ). 
     Containment band  210  includes a base  212  and one or more sidewalls  220  extending from the base. Base  212  and sidewall  220  may cooperate to secure wafer  230  and reduce contamination of during manufacturing of an optical article. In some implementations, containment band  210  may include a tab  215  (e.g., an alignment member) and/or a rib (e.g.,  250 ). As shown in  FIG. 2A , containment band  210  includes tab  215 . 
     Base  212  may include a first surface  214  and a second surface  216  that is opposite the first surface  214 . Additionally, base  212  includes a third surface  217  and a fourth surface  219  opposite the third surface  217 . In some implementations, first surface  214  may correspond to an interior side and second surface  216  may correspond to an exterior side of base  212 . In some implementations, base  212  includes a planar annular member extending between first surface  214  and second surface  216 . The term annular member as used herein is not limited to a circle. For example, first surface  214  may be elliptical, circular, rounded, or otherwise shaped to form a bounded region that defines an opening  204 . Additionally, or alternatively, second surface  216  may define a perimeter or periphery of at least a portion of base  212 . Base  212  includes a width D 1  measured from first surface  214  to second surface  216  along a straight line. Width D 1  may be any suitable distance to receive wafer  230 . For example, width D 1  may be greater than or equal to any of, or between any two of, the following: 0.25, 0.5, 1, 2, 3, or 5 millimeters (mm). In some implementations, width D 1  may be measured along a direction that is orthogonal to first surface  214 , second surface  216 , or both. Additionally, or alternatively, base  212  may have a distance D 5  between third surface  217  and fourth surface  219 , such as a distance along a straight line that is orthogonal to third surface  217 , fourth surface  219 , or both. 
     Sidewall  220  includes a first end  222 , a second end  224 , an inner surface  226  and an outer surface  228 . As shown first end  222  is opposite second end  224 . Inner and outer surfaces  226 ,  228  extend from first end  222  to second end  224  of sidewall  220 . In some implementations, inner surface  226  may correspond to an interior surface and outer surface  228  may correspond to an exterior, opposing, surface of sidewall  220 . To illustrate, sidewall  220  includes a thickness D 8  measured from inner surface  226  to outer surface  228  along a straight line. Thickness D 8  may be any suitable distance to receive and/or secure wafer  230 . For example, thickness D 8  may be greater than or equal to any of, or between any two of, the following: 0.25, 0.5, 0.75, 1, 2, 3 or 5 mm. Additionally, or alternatively, second end  224  may correspond to a top surface of sidewall  220  and first end  222  may correspond to a bottom or bottom surface of sidewall  220 . In some such implementations, inner surface  226  defines an opening at second end  224  to receive at least a portion of wafer  230 . 
     Sidewall  220  projects outwardly from base  212 . In some implementations, sidewall  220  extends vertically upward from second surface  216  (e.g., periphery) of base  212  to contain wafer  130 . In some implementations, sidewall  220  may extend in a direction that is substantially perpendicular (e.g., 90 degrees) to base  212 . Additionally, or alternatively, an angle D 6  between fourth surface  219  and inner surface  226 . In the depicted implementations, base  212  and sidewall  220  are unitary. In this manner, first end  222  of sidewall  220  may corresponded to fourth surface  219  of base  212 , however, in other implementations, first end  222  of sidewall(s)  220  may be coupled to base  212  in any suitable manner, such as via an adhesive or ultrasonic welding, as illustrative, non-limiting examples. 
     As shown in  FIG. 2B , a cross-section of containment band  210  may resemble an “L” shape. In other implementations, sidewall may be angled (e.g., between 80 and 150 degrees depending on base curve of wafer  230 ) to securely couple containment band  210  to wafers of different sizes and shapes. For example, an angle D 6 , measured between fourth surface  219  of base  212  and inner surface  226  of sidewall  220  may be greater than or equal to any of, or between any two of, the following: 65, 75, 85, 90, 95, 105, 115, 125, or 135 degrees. In some implementations, angle D 6  is sized to correspond to wafer  230 . Sidewall  220  may surround a portion of base  212  (e.g., first surface  214 ) or first opening  204  to define a chamber configured to receive a wafer (e.g.,  130 ). In some implementations, sidewall  220  may surround at least a majority of opening  204  to enable containment band  210  to be securely coupled to a wafer (e.g.,  130 ) during manufacture of an optical article (e.g.,  102 ). For example, sidewall  220  may form a cylindrical protrusion that extends upwardly from base  212 . As shown in  FIG. 2A , sidewall  220  defines a single opening (e.g.,  206 ). Alternatively, in other implementations, sidewall  220  may define multiple openings (e.g.,  206 ), as described further herein at least with reference to  FIGS. 3 and 4 . Additionally, or alternatively, in some implementations, sidewall  220  may surround an entirety of first opening  204  such that the sidewall does not define any openings (e.g.,  206 ). In some of the foregoing implementations, an opening (e.g.,  206 ) is oriented to align with an entrance gate of mold device  140  to allow for sufficient space for a moldable material (e.g.,  148 ) to enter the mold cavity (e.g.,  142 ) to reduce a force of the moldable material from moving the wafer within the mold cavity. 
     Sidewall  220  may be shaped and sized in any suitable manner to prevent contamination in a mold (e.g.,  140 ) based on the wafer (e.g.,  130 ) and mold cavity (e.g.,  142 ). In some implementations, sidewall  220  includes a second distance D 2  (e.g., an outer diameter) that defines a maximum transverse dimension of the containment band measured from opposing sides of outer surface  228  of sidewall  220  along a straight line. In some implementations, second distance D 2  is greater than or equal to any of, or between any two of, the following: 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, or 150 millimeters (mm) (e.g., between 70 and 100 mm, such as 80 mm); however, the outer diameter D 2  may be dimensioned such that it is substantially equal to a diameter of a mold insert (e.g.,  144 ,  146 ). In some implementations, outer surface  228  of sidewall  220  and second surface  216  of base  212  may be aligned such that an outer diameter of base  212  corresponds to outer diameter D 2 . 
     Containment band  210  may also include a third distance D 3  (e.g., an inner diameter) that defines a distance measured between opposing sides of inner surface  226  of sidewall  220 . In some implementations, third distance D 3  is greater than or equal to any of, or between any two of, the following: 50, 60, 70, 80, 90, 100, or 110 millimeters (mm) (e.g., 70 mm); however, the outer diameter may be dimensioned such that it is substantially equal to an outer diameter of a wafer (e.g.,  130 ). In some implementations, sidewall  220  may include a distance D 4  (e.g., a height) measured from first end  222  of the sidewall to second end  224  of the sidewall along a straight line. In some implementations, distance D 4  corresponds to a distance between fourth surface  219  of base  212  and second end  224  along a line substantially perpendicular to fourth surface  219 , or a line from an intersection (e.g., corner) of fourth surface  219  and inner surface  226  to second end  224  (e.g., an edge surface) of sidewall  220 . In some implementations, distance D 4  of sidewall  220  is greater than or equal to any of, or between any two of, the following: 0.5, 1, 2, 3, 4, or 5 (mm). 
     Additionally, or alternatively, containment band  210  may include a fourth distance D 7  (e.g., an opening diameter) that corresponds to a maximum transverse dimension of opening  204 . For example, fourth distance D 7  may be measured from opposing sides of first surface  214  of base  212  along a straight line. In some implementations, fourth distance, such as a diameter or maximum transverse dimension of opening  204 , is greater than or equal to any of, or between any two of, the following: 1, 15, 25, 50, 60, 70, 80, 90, or 100 millimeters (mm). Fourth distance D 7  is less than third distance D 3  to allow base  212  to function as described herein. 
     Tab  215  (e.g., an alignment member) may extend from a portion of base  212  or sidewall  220  to orient containment band  210 , such as to orient containment band  210  without directly touching base  212  or sidewall  220 . Tab  215  may include or correspond to one or more features  115  (e.g., a recessed alignment member). As shown, tab  215  extends from base  212  in a direction away from opening  204 . In some implementations, tab  215  may extend from second surface  216  of base  212  in a direction radially away from opening  204 . In this way, containment band  210  and wafer  230  may be easily oriented while the containment band  210  is within a cavity of an injection mold (e.g.,  140 ). In some implementations, tab  215  is co-planar with base  212 . For example, a bottom surface of tab  215  may be co-planer with third surface  217  of base  212 . In some such implementations, tab  215  includes a thickness that may be substantially equal to thickness D 5  of base  212 . In other implementations, a thickness of tab may be greater than or less than thickness D 5 . Additionally, or alternatively, tab  215  may be substantially perpendicular to at least a portion of sidewall  220 . In some implementations, tab  215  is opposite of (e.g., 180° from) an opening (e.g.,  206 ) of sidewall  220  to easily aid to orient containment band  210  while the band is within a mold cavity; however, tab  215  may be placed in any suitable manner depending on dimensions and shape of the mold cavity or wafer. Some implementations, do not include a tab (e.g.,  215 ) and, in other implementations, containment band  210  include two or more tabs (e.g.,  215 ) which may be positioned about base  212 . Tab  215  may be unitary with base  212  and/or sidewall  220 , however, in other implementations, the tab may be coupled to the base in any suitable manner. In such implementations, containment band  210  may include one or more additional features (e.g., one or more notches in sidewall  220 ) to assist with aligning the containment band within a mold (e.g.,  140 ). The one or more notches, such a recess, groove, or depression, may include or correspond to one or more features  115 . 
     Referring now to  FIGS. 2C and 2D , containment band  210  may be operable with wafer  230  to prevent contamination from the wafer during a manufacturing process. For example, containment band  210  may surround a portion (up to and including all) of wafer  230  to prevent material from contaminating one or more components (e.g., mold insert, mold cavity, mold wall) used during the manufacturing process. For example, in some implementations, one or more sidewalls  220  collectively surround at least 25% of opening  204 . As another example, one or more sidewalls may collectively surround 50%, 75%, or 90% of opening  204 . 
     Wafer  230  may include a first layer  232  (e.g., a first surface), a second layer  234  (e.g., a second surface) and third layer  236  (e.g., inner layer) and an outer wall  238 . In some implementations, wafer may include one or more additional layers. For example, wafer  230  may include an adhesive layer disposed between first layer  232  and third layer  236  and/or between second layer  234  and the third layer. Outer wall  238  (e.g., outer surface) may extend between top layer  232  and bottom layer  234  of wafer  130 . In some implementations, outer wall  238  may intersect with top and bottom surfaces to define a periphery of wafer  230 . As shown, top layer  232  and bottom layer  234  (e.g., outer layers) are coupled to opposing sides of inner layer  236  and overlie and underlie, respectively, the inner layer. Each layer ( 232 ,  234 ,  236 )—e.g., a perimeter of each layer—may be elliptical, circular, or otherwise rounded such that the ends of each layer are aligned to form outer wall  238 . In this way, outer wall  238  may be smoothed (e.g., not staggered) to form a high-quality optical article that may be easy mass produced without additional operations (e.g., machining, or other processes). In some implementations, wafer  230  may be convex and include a base curve between 0.1 to 12.0. 
     As shown in  FIG. 2D , inner layer  236  is disposed between two outer layers ( 232 ,  234 ). Inner layer  236  (e.g., contamination layer) may include a soft matrix material that is susceptible to outflow at the elevated temperature and pressures experienced during an injection molding process. Under these injection molding process conditions (high temp. &amp; pressure), the soft matrix material of inner layer  236  will flow out from between outer layers ( 232 ,  234 ) and contaminate one or more components (e.g., mold insert  144 , insert  146 , a space between inserts and sidewall  154 ) of a mold device (e.g.,  140 ) as well as subsequent optical articles (e.g.,  102 ) formed in the contaminated mold device. Such soft matrix materials may include, but are not limited to, thermoplastic elastomers (such as a thermoplastic polyurethane (TPU) (from Lubrizol Corporation, Tecoflex aliphatic polyether-based TPU product family, e.g., Tecoflex EG85A or Tecoflex EG80A; Lubrizol Corporation, Estane aliphatic TPU product family, e.g., Estane ALR E77A-V, Estane AG 8451, Estane VSN F5000); or semi-crystalline Polyether-block-polyamides (PEBA) (from Arkema S.A, Pebax® elastomers product family, e.g., Pebax 5533, Pebax 4533 and Pebax 4033), materials that soften, liquefy, or melt at temperatures near the molding temperature, and/or materials that will deform and flow under molding pressures. Top layer  232  and bottom layer  234  may include a harder thermoplastic material (e.g., polycarbonate) that may withstand the pressures and temperatures associated with injection molding without contaminating the mold. In some implementations, outer layer may include the same material as the injected material (e.g.,  148 ) to facilitate bonding of the injection material with wafer  230 . 
     Containment band  210  may be coupled to, and surround at least a portion (up to and including all) of wafer  230  to prevent material from inner layer  236  from contacting the components of the mold device. For example, containment band  210  at least partially surrounds outer wall  238  to capture soft pliable material escaping from inner layer  236 . In this way, containment band  210  (e.g., sidewall  220 ) may be interposed between outer wall  238  of wafer  230  and components of injection mold device (e.g.,  144 ,  146 ,  152 ) to prevent, or minimize, contamination. Accordingly, containment band  210  may enable easy removal of inserts (e.g.,  144 ,  146 ) from mold block (e.g.,  152 ), allow for faster manufacturing times, increased product yields, and decreased maintenance during the manufacture of an optical article (e.g.,  102 ). 
     As shown, a concave surface (e.g., of layer  234 ) of wafer  230  faces base  212 ; however in other implementations, a convex surface (e.g., of layer  232 ) of the wafer may face base  212 . In some implementations in which the convex surface faces base  212 , a portion of wafer  230  may extend into or through opening  204 . In some implementations, containment band  210  may contact at least a portion of outer wall  238  (e.g., outer surface of inner layer  236 ). In such implementations, containment band  210  may be coupled to wafer  230  via friction (e.g., from sidewall  220 ), via coupling means, such as adhesive, via a combination of friction and the coupling means, or the like. To illustrate, containment band  110  may be sized such that an inner diameter (e.g., D 3 ) of sidewall  220  corresponds to an outer diameter of wafer  230 . In some implementations, containment band  210  may be elastic (e.g., flexible) such that the containment band  210  applies a slight force on at least a portion of outer wall  238  of wafer  230  to secure the wafer during the manufacturing (e.g., injection molding) process. In other implementations, a clearance (e.g., gap) may be defined between containment band  210  and wafer  230 . For example, containment band  210  may be sized so that a space (e.g., less than 1 mm) is formed between inner surface  226  of sidewall  220  and outer wall  238  of wafer  230 . In this way, injected material (e.g.,  148 ) may flow between the sidewall and the wafer to encapsulate any soft material extruded from a contamination layer (e.g.,  236 ) of wafer  230  and prevent contamination of the mold device (e.g.,  140 ). In some implementations, sidewall  220  may define a groove that corresponds to a rib of wafer  230  such that the groove and rib may engage to securely couple the wafer and containment band  210  together. 
     In some implementations, opening  206  defined between sidewall  220  may allow injected material (e.g.,  148 ) to flow through sidewall  220  such that the injected material can bond to outer wall  238  of wafer  230 . In some implementations, opening  206  is sized so that a small area of wafer  230  is exposed while the wafer is coupled to containment band  210 . The exposed area (e.g., portion of outer wall  238  not surrounded by sidewall  220 ) may be kept small (e.g., less than 10% of the surface area of outer wall  238 ) to prevent material from a contaminant layer (e.g.,  236 ) from contacting mold device (e.g.,  140 ). In this way, the injected material (e.g.,  148 ) is able to encapsulate any material that oozes out from wafer  230  at opening  206 . 
     Referring now to  FIGS. 3 and 4 , additional examples of containment bands for use in manufacture of an optical article, are shown. For example,  FIG. 3  shows a perspective view of an example of a containment band  310 , and  FIG. 4  shows a perspective view of an example of a containment band  410 . Containment bands  310 ,  410  may include or correspond to containment band  110  and/or  210  and may be configured to prevent a wafer (e.g.,  130 ,  230 ) from contaminating a cavity (e.g.,  142 ) of a mold device (e.g.,  140 ). 
     As shown in  FIGS. 3 and 4 , containment bands  310 ,  410  may include a plurality of sidewalls  220 . For example,  FIG. 3  depicts an implementation having five sidewalls (e.g.,  220 ) that define five second openings  206  and  FIG. 4  depicts an implementation having three sidewalls (e.g.,  220 ) that define three second openings. In other implementations, the containment band may include more than five sidewalls or fewer than three sidewalls. Sidewalls  220  may surround (e.g., collectively surround) a portion of base  212  (e.g., first surface  214 ) or first opening  204 . In some implementations, each sidewall  220  have substantially equal arc lengths. Alternatively, at least on sidewall may have an arc length that is different from an arc length of at least one other sidewall. In some such implementations, each sidewall  220  may, but need not, be equally spaced along base  212 . In this manner, the second openings  206  defined by adjacent sidewalls  220  may be equally spaced along containment band and enable injection material to bond with outer wall  238  in a balanced manner. 
     The plurality of sidewalls  220  extend outwardly from base  212 . Each sidewall  220  may be moveable relative to one other sidewall such that wafer  230  may be quickly and efficiently coupled to (e.g., disposed within) containment band  210 . For example, at least one sidewall is flexible and can be deflected from a first position to a second position, and return from the second position toward or to the first position. Each sidewall may cooperate to define a chamber or cavity configured to receive wafer  230 . In some implementations, the plurality of sidewalls  220  may collectively surround at least a majority of opening  204  to enable containment band  210  to be securely coupled to wafer  230  during manufacture of an optical article (e.g.,  102 ). In other implementations, the plurality of sidewalls  220  collectively surround at least 25% of opening  204 . 
     In some implementations, sidewalls  220  define a plurality of openings  206 . Each opening  206  may allow injected material (e.g.,  148 ) to flow through sidewall  220  so that the injected material can bond to wafer  230  during injection molding. In some implementations, opening  206  may be defined by a gap between two adjacent sidewalls of the plurality of sidewalls  220 . In some implementations, opening  206  is sized so that an exposed area of a wafer is small enough to prevent pliable material (e.g., from third layer  236 ) of wafer  230  from contaminating a mold. For example, each opening  206  may span a length along a perimeter (e.g.,  216 ) of base  212  that is less than, or less than or equal to, 15% of the total length of the perimeter (e.g., 10 mm) of the base to allow molding material to contact wafer without risk of the wafer moving during the injection molding process. In this way, containment band  210  may prevent contamination of a mold and the injected material (e.g.,  148 ) is able to encapsulate any material that oozes out from a wafer at opening  206 . 
     In some implementations, containment band  210  is used for making an article (e.g., optical article  102 ). For example, containment band  210  may include annular base  212  that defines first opening  204  configured to receive wafer  230  and define one or more sidewalls  220  that project from and surround at least a portion of first opening  204 . In some implementations, one or more sidewalls  220  may define one or more second openings  206 . During formation of the article (e.g.,  102 ), a first portion (e.g.,  232 ) of wafer  230  may be in contact with one or more sidewalls  220  and each of the one or more second openings  206  are configured enable passage of an injection material (e.g.,  148 ) to form the article. In some implementations, containment band  210  includes tab  215  that extends from annular base  212  in a second direction that is away from first opening  204 . In some implementations, each of the one or more sidewalls  220  includes inner surface  226  that faces first opening  204  and outer surface  228  that is opposite inner surface  226 . 
     In some of the foregoing implementations, annular base  212  includes first surface  214  that defines first opening  204  and second surface  216  that defines a periphery of the annular base. In some implementations, containment band  210  includes tab  215  that extends from second surface  216 . Additionally, or alternatively, one or more sidewalls  220  may be positioned proximate to second surface  216  and extends from annular base  212  in a direction that is substantially perpendicular to annular base  212 . In some implementations, height D 4  of sidewall  220  from a top surface of annular base  212  is between 1 to 5 millimeters (mm). In some implementations, a distance D 2  (e.g., an outer diameter) of annular base  212  is between 50 to 150 mm. 
     In some implementations, containment band  210  is configured to be utilized to form an optical article. The optical article may include wafer  230 , a mold material (e.g.,  148 ), and/or at least a portion of containment band  210  for preventing mold contamination during manufacture of the optical article. Wafer  230  includes at least one thermoplastic layer ( 232 ,  234 ,  236 ). In some implementations, containment band  210  includes base  212  having a periphery (e.g.,  216 ) and at least one sidewall  220  extending from the periphery of the base to contact wafer  230 . Sidewall  220  may define one or more openings  206  configured to be occupied by the mold material during an injection molding process. In some implementations, sidewall  220  surrounds a majority of the wafer  230 . In some such implementations, the wafer  230  is disposed within the periphery (e.g.,  216 ) of the base  212  and in contact with inner surface  226  of sidewall  220 . Containment band  210  may include a thermoplastic polymer having a higher glass transition temperature than the at least one thermoplastic layer (e.g.,  236 ) of wafer  230 . 
     Referring now to  FIGS. 5A and 5B ,  FIG. 5A  shows a sectional view of an example of a containment band  510  and  FIG. 5B  shows a side sectional view of containment band  510  coupled to wafer  230 . Containment band  510  is removably coupleable to optical wafer  230  in any manner described above to secure wafer  230  within a mold cavity (e.g.,  142 ) and prevent edge bleed of the wafer. Containment band may include or correspond to containment band  110 ,  210 ,  310 ,  410 . 
     Containment band  510  includes a base  212  and one or more sidewalls  220  that may be coupled to, and surround at least a portion (up to and including all) of wafer  230  to prevent material from inner layer  236  from contacting the components of the mold device. In some implementations, containment band  510  includes a single sidewall  220  (e.g., as shown in  FIGS. 2A-2D ), while in other implementations, containment band  510  includes a plurality of sidewalls  220  (e.g., as shown in  FIGS. 3 and 4 ). 
     Rib  350  (e.g., a securement member) may extend from a portion of sidewall  220  to assist in coupling wafer  230  to containment band  510 . As shown, rib  350  extends from at least one sidewall  220  in a direction toward opening  204 . For example, rib  350  may extend radially inward from sidewall  220 . To illustrate, rib  350  may extend from inner surface  226  of sidewall  220  to contact an outer surface of wafer  230 , when the wafer is coupled to containment band  510 . In this way, containment band  510  may be securely coupled to wafer to prevent relative movement between the wafer and the band and enable manufacture of high-quality optical articles. In the depicted implementations, rib  350  extends from inner surface  226  of sidewall  220  below second end  224 ; however, in other implementations, rib  350  may extend from the inner surface at the second end such that the sidewall does not extend above the rib. In some implementations, rib  350  may be parallel to base  212 . Additionally, or alternatively, rib  350  may be substantially perpendicular to at least a portion of sidewall  220 . Rib  350  may be unitary with base  212  and/or sidewall  220 , however, in other implementations, the rib may be coupled to the sidewall in any suitable manner. 
     In some implementations, each sidewall of the one or more sidewalls  220  includes a corresponding rib  350 . In other implementations, at least one sidewall of the one or more sidewalls does not include rib  350  and at least one other sidewall of the one or more sidewalls includes rib  350 . Additionally, or alternatively, at least one sidewall (e.g.,  220 ) may include multiple rib sections (e.g.,  350 ) such that a gap or space is interposed two adjacent rib sections. Rib  350  may include or correspond to one or more features  115 . Although rib  350  has been described with reference to containment band  510 , one or more ribs  350  may be incorporated into containment band  110 ,  210 ,  310 ,  410 . 
     In some implementations, containment band  510  may contact at least a portion of outer wall  238  (e.g., outer surface of inner layer  236 ). In such implementations, containment band  510  may be coupled to wafer  230  via friction (e.g., from sidewall  220  and/or rib  350 ). In some implementations, containment band  510  may be elastic (e.g., flexible) such that the containment band  510  applies a slight force on at least a portion of outer wall  238  and/or a top surface (e.g.,  232 ) of wafer  230  to secure the wafer during the manufacturing (e.g., injection molding) process. For example, rib  350  may contact wafer  230  to prevent movement of the wafer when coupled to containment band  510 . In some implementations, a clearance (e.g., gap) may be defined between at least a portion of containment band  510  and wafer  230 . For example, containment band  510  may be sized so that a space (e.g., less than 1 mm) is formed between inner surface  226  of sidewall  220  and outer wall  238  of wafer  230 . In this way, rib  350  may secure wafer  230  and an injected material (e.g.,  148 ) may be able to flow between the sidewall and the wafer to encapsulate any soft material extruded from a contamination layer (e.g.,  236 ) of wafer  230  and prevent contamination of the mold device (e.g.,  140 ). In some implementations, opening  206  defined between sidewall  220  may allow injected material (e.g.,  148 ) to flow through sidewall  220  such that the injected material can bond to outer wall  238  of wafer  230  as described herein. 
     As described above, the containment band (e.g.,  110 ,  210 ,  310 ,  410 ,  510 ) may be customized to enable the containment band to securely couple to various wafers having different wafer geometries (e.g., size, base curve, etc.). Containment band configuration may also be customized based on a desired optical article to be formed. As an illustrative, non-limiting example, in an implementation where the containment band will be removed after the injection molding process, a containment band (e.g.,  210 ) having a single sidewall  220  may be used and, in other implementations where the containment band is included in the finished optical article, a containment band (e.g.,  310 ,  410 ) having multiple sidewalls  220  may be used. 
     In some implementations, containment band  510  is used in making an optical article (e.g.,  102 ). For example, containment band  510  includes an annular base  212  that defines first opening  204  configured to receive wafer  230  and one or more sidewalls  220  that project a first direction from and surround at least a portion of the first opening. In some such implementations, one or more sidewalls  220  may define one or more second openings  206 . In some implementations, during formation of the optical article, a first portion of the wafer is in contact with one or more sidewalls  220  and each of one or more second openings  206  are configured enable passage of an injection material (e.g.,  148 ) to form the optical article. In some implementations, each sidewall  220  includes inner surface  226  that faces first opening  204  and outer surface  228  that is opposite the inner surface. Some implementations include a member (e.g.,  350 ) extending from at least a portion of inner surface  226  of at least one sidewall  220 . 
     Referring to  FIG. 6 , an example of a method  600  of forming an optical article is shown. Method  600  may be performed by one or more components of system  100 , such as containment band  110 ,  210 ,  310 ,  410 ,  510 , wafer  130 ,  230 , mold device  140 , or moldable material  148 . In some implementations, method  600  may be performed or initiated by a control device or a control system, such as a processor coupled to memory. Method  600  includes forming an optical article (e.g., lens). The optical article may include or correspond to optical article  102 . In some implementations, optical article is a semi-finished lens, while in other implementations, optical article  102  is a finished lens. 
     Method  600  includes disposing a wafer into a mold cavity, at  602 . For example, wafer may include or correspond to wafer  130 ,  230 , and mold cavity may include or correspond to cavity  142 . In some implementations, the wafer includes containment band coupled to and covering an outer periphery of the wafer. The containment band may include or correspond to containment band  110 ,  210 ,  310 . 
     Method  600  also includes injecting a moldable material into the mold cavity, at  604 . The moldable material is consolidated (e.g., via heat and pressure) to bond the moldable material to the wafer and/or the containment band. The moldable material may include or correspond to moldable material  148 . In some implementations, method  600  may include heating the moldable material to a molten state and injecting the moldable material into the mold cavity. 
     In some implementations, method  600  may include coupling the containment band to the wafer. For example, coupling the containment band to the wafer may include inserting the wafer into the containment band such that the containment band disposed around a periphery of the wafer. In some such implementations, the wafer may be inserted into the containment band such that at least a majority of the containment band is disposed around the periphery of the wafer. 
     In some implementations, method  600  includes forming the containment band. For example, the containment band may be formed by injection molding. As another example, the containment band may be formed by 3D printing. Additionally, or alternatively, method  600  may include forming a wafer having at least three layers in which a middle layer of the wafer includes a thermoplastic matrix material. The thermoplastic matrix material of the middle layer of the wafer may have a glass-transition temperature that is less than a glass transition temperature of one of the other layers of the wafer. 
     In some implementations, method  600  includes setting the moldable material to form a semi-finished lens including the wafer, the containment band, and the moldable material. Additionally, or alternatively, method  600  may include forming a finished lens from the semi-finished lends by removing at least a portion of the containment band from the semi-finished lens. Forming the optical member (e.g., finished lens) may include molding, coating, surfacing, milling, edging, laser etching, grinding, polishing, or the like, or a combination thereof, as illustrative, non-limiting examples. 
     In some implementations, method  600  may include removing the optical article (e.g., semi-finished lens or finished lens) from the mold cavity. After removing the optical article, method  600  may also include inserting a second wafer coupled to a second containment band into the mold cavity. As described above, method  600  enables manufacturing of an optical article without contamination of a mold (e.g., mold cavity, insert, receiver). Accordingly, method  600  enables faster manufacturing times, increased product yields, and decreased maintenance during the manufacture of the optical article. 
     The above specification and examples provide a complete description of the structure and use of illustrative implementations. Although certain implementations have been described above with a certain degree of particularity, or with reference to one or more individual implementations, those skilled in the art could make numerous alterations to the disclosed implementations without departing from the scope of this invention. As such, the various illustrative implementations of the methods and systems are not intended to be limited to the particular forms disclosed. Rather, they include all modifications and alternatives falling within the scope of the claims, and implementations other than the one shown may include some or all of the features of the depicted implementation. For example, elements may be omitted or combined as a unitary structure, and/or connections may be substituted. Further, where appropriate, aspects of any of the examples described above may be combined with aspects of any of the other examples described to form further examples having comparable or different properties and/or functions, and addressing the same or different problems. Similarly, it will be understood that the benefits and advantages described above may relate to one implementation or may relate to several implementations. 
     The claims are not intended to include, and should not be interpreted to include, means-plus- or step-plus-function limitations, unless such a limitation is explicitly recited in a given claim using the phrase(s) “means for” or “step for,” respectively.