JP2009082962A - Small sheet manufacturing method - Google Patents

Abstract

An object of the present invention is to provide a method of manufacturing a small sheet with good dimensional accuracy and cut surface quality when a laser cutting device is incorporated in a forming process and cut online.
A melted resin is extruded into a sheet form from a die 44, the extruded resin sheet A is sandwiched between a mold roller 46 and a nip roller 48, and the resin sheet A is molded so as to have a thickness distribution in the width direction. Peeling is performed from the mold roller 46 by the peeling roller 50, and the resin sheet A is first cut along a direction orthogonal to the conveyance direction, and the cut sheet resin sheet A is held in the conveyance direction while being pressed by the drum-shaped member 92. Are cut by the laser cutting device 90A to form a surface to be a light incident surface of the small piece sheet, and the small piece sheet is manufactured.
[Selection] Figure 3

Description

  The present invention relates to a method for manufacturing a small piece sheet, and more particularly to a method for manufacturing a small piece sheet applied to a side edge type light guide plate.

  A conventional method of manufacturing a light guide plate is performed by forming a large sheet and cutting it into a required size in a subsequent process. In order to reduce the processing cost, when a laser cutting device is incorporated in the extrusion process and cutting is performed online, there is a problem that if the sheet travel fluctuates, the focus of the laser shifts from the processing part and the processing becomes unstable. Patent Document 1 proposes a method for stabilizing the sheet running by a suction action by sucking through a through hole as a countermeasure. However, this method has a problem that a thick sheet has a small stabilizing effect, and if a gap occurs due to warping or the like, suction is not sufficiently effective.

  Furthermore, when cutting two or more sheets in the width direction of a large sheet, if the resin sheet is first cut along the transport direction (MD direction), due to the tension difference to each sheet during subsequent transport, There was a possibility that a deviation occurred in the traveling direction of each sheet and the cut surface was damaged. Further, in the subsequent cutting process, there is a possibility that a perpendicular angle between the cut surfaces cannot be obtained when cutting along the direction (TD direction) orthogonal to the transport direction.

On the other hand, if the TD direction is cut first, tension cannot be applied to the cut resin sheet, so that the resin sheet flutters when cutting in the MD direction, resulting in dimensional variations or the focus of the laser. There has been a problem of cutting failure due to misalignment.
Japanese Patent Publication No. 3-79116

  The present invention has been made in view of the conventional problems, and a method for producing a small piece sheet having a good dimensional accuracy and a good quality of the cut surface when a laser cutting device is incorporated in a molding process and cut online. The purpose is to provide.

  In order to achieve the above object, the method for producing a small piece sheet of the present invention is a method for producing a small piece sheet by cutting a resin sheet along a conveyance direction and a direction orthogonal to the conveyance direction, and a molten resin A step of extruding the resin sheet from a die, a step of sandwiching the extruded resin sheet between a mold roller and a nip roller, molding the resin sheet to have a thickness distribution in the width direction, and a step of peeling the resin sheet from the mold roller Cutting the resin sheet along a direction orthogonal to the conveying direction, and cutting the cut resin sheet with a laser beam along the conveying direction while pressing the resin sheet with a regulating means, and a light incident surface of the small piece sheet And a step of forming a surface to become.

  According to the present invention, a resin sheet having a distribution in the thickness direction by extrusion molding is first cut along a direction orthogonal to the transport direction to obtain a sheet resin sheet having a predetermined length. Next, the resin sheet is cut by laser light while being pressed by the restricting means so that it does not shift during travel, thereby forming a light incident surface of the small piece sheet. Since the cutting is performed with the laser beam using the regulating means, the perpendicularity between the cut surfaces can be maintained. Further, since the light incident surface is formed into a mirror surface by cutting the laser beam, polishing is not necessary.

  The method for producing a small sheet according to the present invention is characterized in that, in the above invention, the regulating means is a drum-shaped member that is disposed opposite to both edge portions of the resin sheet and that is thin at the center and thick at both ends. To do. Since the restricting means is a drum-shaped member, the resin sheet can be reliably suppressed from both edges. Since no deviation occurs during traveling, the dimensional accuracy of the small piece sheet and the quality of the cut surface can be improved.

  In the method of manufacturing a small piece sheet of the present invention, in the above invention, a plurality of the drum-shaped members opposed to each other are arranged, and an interval between the drum-shaped members arranged opposite to each other is in a conveying direction of the resin sheet. It is characterized by gradually becoming narrower.

  Immediately after the resin sheet is cut along the direction orthogonal to the conveying direction, even if the sheet resin sheet is displaced before being pressed by the restricting means, the gap between the pair of drum-shaped members arranged to face each other Is configured to gradually narrow, so that the deviation of the resin sheet can be adjusted.

  The method for manufacturing a small sheet according to the present invention is characterized in that, in the above invention, the regulating means is a belt for pressing the resin sheet from above. By pressing the resin sheet with the belt, it is possible to suppress the running flutter of the sheet.

  The method for manufacturing a small piece sheet according to the present invention is characterized in that, in the above invention, the restricting means presses the resin sheet from above with wind pressure. By pressing the resin sheet with the wind pressure, it is possible to suppress the running flutter of the sheet and simultaneously blow off the generated gas to prevent ignition.

  The method for manufacturing a small piece sheet according to the present invention is characterized in that, in the above invention, the regulating means applies the static electricity to the resin belt in close contact with the transport belt. By applying static electricity to the resin sheet and bringing it into close contact with the conveyor belt, it is possible to suppress sheet running flutter.

  The method for producing a small piece sheet according to the present invention further includes a step of cutting both edges of the resin sheet with a laser beam before the step of cutting the resin sheet along a direction orthogonal to the conveying direction. . In particular, both edge portions of the resin sheet formed by extrusion molding are often inferior in shape and dimensional accuracy compared to the central portion of the resin sheet. Therefore, it is possible to obtain an accurate shape as a small piece sheet by cutting both edge portions. On the other hand, both edge portions do not normally become light incident surfaces in the small piece sheet and do not greatly affect the function of the small piece sheet, so that cutting with a laser beam is possible during conveyance of the resin sheet.

  According to the present invention, when a laser cutting device is incorporated in a forming process and cutting is performed on-line, it is possible to manufacture a small sheet with good dimensional accuracy and cut surface quality.

  A preferred embodiment of the present invention will be described below with reference to the accompanying drawings by taking a light guide plate as an example of a method for producing a small piece sheet. The present invention will be described with reference to the following preferred embodiments, but can be modified in many ways without departing from the scope of the present invention, and other embodiments than the present embodiment can be used. be able to. Accordingly, all modifications within the scope of the present invention are included in the claims.

  FIG. 1 shows an example of a light guide plate manufactured according to the present invention. The light guide plate is not uniform in thickness but has a thickness distribution.

  As shown in FIG. 1A, a light guide plate 100 having a thick wall at one end and a thin wall at the other end is used for a liquid crystal panel having a relatively small screen such as a notebook computer. The light guide plate 100 guides light from the light incident surface 102 to the light emitting surface 104, a light incident surface 102 on which light from a light source unit (not shown) is incident, a light emitting surface 104 that emits light on the surface. The light reflecting surface 106 and the facing surface 108 located on the opposite side of the light incident surface 102 are configured.

  For a large-screen liquid crystal panel such as a large-screen liquid crystal television, a light guide plate 200 having a thick central part and thin both ends as shown in FIG. 2B is used. The light guide plate 200 guides light from the light incident surface 202 to the light emitting surface 204, a light incident surface 202 on which light from a light source unit (not shown) is incident, a light emitting surface 204 that emits light on the surface. The light reflecting surface 206 and a facing surface 208 positioned on the opposite side of the light incident surface 202 are configured.

  The light guide plates 100 and 200 are called side edge type or side edge type light guide plates because they have light incident surfaces 102 and 202 for allowing light to enter from the side.

  In the present invention, the light incident surface 102 of the light guide plate 100 and the light incident surface 202 of the light guide plate 200 are formed by cutting the resin sheet with laser light. As a result, the cut surfaces of the light incident surface 102 and the light incident surface 202 are mirror-like, and polishing is not necessary.

  FIG. 2 is an example of an overall process diagram for manufacturing a light guide plate to which the present invention is applied, and FIG. 3 is a conceptual diagram of a light guide plate manufacturing apparatus including various devices for performing each process.

  As shown in FIG. 2, the light guide plate manufacturing method to which the present invention is applied mainly includes a raw material process 10 for measuring and mixing raw materials, and an extrusion process for continuously extruding molten resin into a sheet shape (band shape). 12 and a molding step 14 in which the extruded resin sheet is sandwiched between a mold roller and a nip roller, and the resin sheet is cooled and solidified while being molded into a shape having a thickness distribution in the width direction, and the solidified resin sheet is gradually cooled. A cooling step 16, a warpage measuring step 18 for measuring pass / fail with respect to a predetermined standard regarding the warpage of the slowly cooled resin sheet, and if the warp exceeds a predetermined standard, the resin sheet is fed back to the molding step 14 and the slow cooling step 16 A control step 20 for controlling the cooling rate and the slow cooling rate in the width direction to be uniform, and a laminate for laminating a surface protective film on the front and back surfaces of the resin sheet And a cutting step 24 for cutting the resin sheet to a predetermined size (length / width) to form individual light guide plates, and a stacking step 26 for loading the cut light guide plates. .

  Hereinafter, the main configuration of the light guide plate manufacturing apparatus to which the present invention is applied will be described with reference to FIG.

  As shown in FIG. 3, in the raw material process 10, the raw material resin and the additive sent from the raw material silo 28 (or raw material tank) and the additive silo 30 (or additive tank) to the automatic weighing machine 32 are automatically measured. In the mixer 34, the raw material resin and the additive are mixed at a predetermined ratio.

  When adding scattering particles to the raw material resin as an additive, first, master pellets in which the scattering particles are added to the raw material resin at a concentration higher than a predetermined concentration are manufactured by a granulator. Next, by suitably adopting the master batch method, the master pellets to which the scattering particles are added at a higher concentration than the predetermined concentration and the base pellets to which the scattering particles are not added are mixed at a predetermined ratio by the mixer 34. The same applies when additives other than the scattering particles are added.

  As the raw material resin used in the present invention, a thermoplastic resin can be used. For example, polymethyl methacrylate resin (PMMA), polycarbonate resin (PC), polystyrene resin (PS), MS resin, AS resin, polypropylene resin (PP ), Polyethylene resin (PE), polyethylene terephthalate resin (PET), polyvinyl chloride resin (PVC), thermoplastic elastomer, or a copolymer thereof, cycloolefin polymer, and the like. The raw material resin appropriately weighed and mixed in the raw material process 10 is sent to the extrusion process 12.

  In the extrusion step 12, the raw material resin mixed in the mixer 34 is charged into the extruder 38 through the hopper 36. The raw material resin is melted while being kneaded by the extruder 38. The extruder 38 may be either a single-screw extruder or a multi-screw extruder, and preferably includes a vent function that evacuates the inside of the extruder 38. The raw material resin melted by the extruder 38 is sent to a die 44 (for example, a T die) through a supply pipe 42 by a metering pump 40 such as a screw pump or a gear pump. The resin sheet A extruded from the die 44 into a sheet shape is sent to the molding step 14.

  In the molding step 14, the resin sheet A extruded from the die 44 is sandwiched between the mold roller 46 and the nip roller 48. The resin sheet A is cooled and solidified while being molded into a shape having a thickness distribution in the width direction. The solidified resin sheet A is peeled off by the peeling roller 50. The resin sheet A that has undergone the molding step 14 is then sent to the slow cooling step 16.

  The mold roller 46 is formed with a narrow shape at the center and both ends. The nip roller 48 is formed in a substantially flat shape. A reverse shape for molding the resin sheet is formed on the roller surface of the mold roller 46. As a result, the high-temperature resin sheet A pushed out from the die 44 is formed into a shape having a thickness distribution by being narrowed (nip) by the mold roller 46 and the nip roller 48 with a predetermined nip pressure. In the present embodiment, the resin sheet A is molded so as to have two thick portions. The nip roller 48 is provided with a pressing means (not shown) so that the resin sheet A between the nip roller 46 and the mold roller 46 can be pressed with a predetermined pressure. Each of the pressurizing means is configured to apply pressure in the normal direction at the contact point between the nip roller 48 and the mold roller 46, and various known means such as a motor driving means, an air cylinder, and a hydraulic cylinder are employed. it can.

  The peeling roller 50 is disposed opposite to the mold roller 46 and is a roller for peeling the resin sheet A from the mold roller 46 by winding the resin sheet A, and is disposed 180 degrees downstream of the mold roller 46.

  As the material of the mold roller 46, the nip roller 48 and the peeling roller 50, various steel members, stainless steel, copper, zinc, brass, these metal materials as a core metal, rubber-lined on the surface, and these metal materials as HCr Those plated with Cu, Cu, Ni, etc., ceramics, and various composite materials can be used.

  The slow cooling step (or annealing step) 16 is provided in order to prevent a rapid temperature change of the resin sheet A downstream of the peeling roller 50. When a sudden temperature change occurs in the resin sheet A, for example, the inside of the resin sheet A becomes elastic even though the vicinity of the surface of the resin sheet A is in a plastic state. The surface shape of the sheet A may be deteriorated. Further, when a temperature difference occurs between the front and back surfaces of the resin sheet A, the resin sheet A is likely to warp. In particular, when the resin sheet A has a thickness distribution in the width direction, the resin sheet A is likely to warp.

  The slow cooling step 16 is provided with a tunnel-like slow cooling zone 54 (or annealing zone) having an inlet and an outlet. In the first half of the slow cooling zone 54, the resin sheet A is heated in the heating zone 55 and gradually naturally cooled. In the latter half of the slow cooling zone, forced cooling is performed by applying cold air to the resin sheet A.

  As the heating zone 55 provided in the first half of the slow cooling zone 54, a structure in which air (hot air) whose temperature is controlled from a plurality of nozzles is jetted toward the resin sheet A, a nichrome wire heater, an infrared heater, a dielectric heating means, and the like Thus, various known means such as a structure for heating the resin sheet A can be employed.

  Further, in the first half of the slow cooling zone 54, when the resin sheet A is slowly cooled and conveyed, an external force is applied to the resin sheet A so that the conveyance is not hindered, so that the resin sheet A has an original shape without warping. In order to hold, shape holding means (not shown) is provided.

  In addition, a plurality of air nozzle devices (not shown) are provided in the second half of the slow cooling zone 54 to blast and convey the resin sheet A by blowing cold air to the upper side and the lower side across the resin sheet A. As the air nozzle device, a known device that is used when the web-like conveyance object is floated and conveyed can be used. Thereby, the resin sheet A is cooled to about normal temperature in a non-contact state where it does not contact the roller.

  Next, as shown in FIG. 3, the resin sheet A cooled in the slow cooling step 16 is taken up by a nip type feed roller 70 and sent to a warp measurement step 18.

  In the warp measurement step 18, the warp measuring device 72 determines whether the warp of the resin sheet A is acceptable for a predetermined standard. If the amount of warpage measured by the warpage measuring device 72 exceeds a predetermined standard, the control step 20 feeds back the information to the molding step 14 and the slow cooling step 16, and the cooling rate in the resin sheet width direction and The slow cooling rate is controlled to be uniform.

  A laminating process 22, a cutting process 24, and a loading process 26 are sequentially provided downstream of the warp measuring process 18. The laminating step 22 is a step of attaching a protective film (film such as polyethylene) to the front and back surfaces of the resin sheet A. The protective film 84 rewound from the pair of reels 82 is joined so as to sandwich the resin sheet A, and is laminated by passing through the nip roller 86.

Before being conveyed to the cutting step 24, both edges of the resin sheet A are cut by the laser cutting device 74 during conveyance. The resin sheet A is molded into a predetermined shape in the molding step 14,
Both edge portions of the resin sheet A are cut because the dimensional accuracy is worse than the center portion in the shape. Since both edge portions of the resin sheet A do not serve as light incident surfaces in the light guide plate, even if the resin sheet A is cut while being conveyed, the influence on the quality surface of the light guide plate is small. In addition, it can also be implemented simultaneously with this process cutting process 24, and can be omitted.

  A part of the cut resin sheet A is collected in a collection box 76, and the collected resin is discarded or reused.

  The cutting step 24 includes a step of cutting the resin sheet A along a direction orthogonal to the conveyance direction and trimming the resin sheet A to a predetermined length, and a step of cutting the central portion of the resin sheet A along the conveyance direction. . The resin sheet is cut into individual light guide plates by passing through the cutting step 24. In this case, in order to obtain dimensional accuracy, it is desirable to control the resin surface temperature within ± 10 ° C., preferably within ± 5 ° C., more preferably within ± 2 ° C. The reason for this is that since it expands / contracts depending on the temperature, accuracy can be ensured by correcting the dimensions at the operating temperature.

  In order to trim the resin sheet A to a predetermined length, for example, a cutting machine 88 is used, and a laser cutting device can be suitably used as shown in FIG. A sheet is formed in the extrusion process, and the resin sheet is cut along a direction orthogonal to the conveyance direction using a laser cutting device while being pressed in the conveyance process. At this time, the laser beam moves in the conveyance direction in synchronization with the resin sheet traveling speed, so that cutting while conveying the resin sheet A becomes possible. That is, in the extrusion molding process, the resin sheet A can be cut to a predetermined length online.

  The cut sheet resin sheet A is conveyed to the next cutting process by the conveyor belt 96 driven by the roller 94, and is not displaced during traveling by the drum-shaped member 92 from the width direction of the resin sheet A. It is held down like.

  As the cutting machine 90 for cutting along the conveying direction, a laser cutting device 90A using laser light is used as shown in FIG. In the present embodiment, the resin sheet is cut along the substantially central portion by the laser beam of the laser cutting device 90A. The cut surface of the cut resin sheet becomes the light incident surface of the light guide plate.

  In the present invention, as shown in the partially enlarged view of the cutting step in FIG. 4, the resin sheet A is molded to have two thick portions through the molding step 14. Two light guide plates are obtained by cutting the central portion of the resin sheet A with the laser beam of the laser cutting device 90A. When cutting with the laser cutting device 90A, both edge portions of the resin sheet A are pressed by the four drum-shaped members 92 so that no deviation occurs during traveling in the arrow direction. As a result, a light guide plate with excellent dimensional accuracy and cut surface quality can be manufactured.

  As a laser light source of the laser cutting device 90A, for example, a carbon dioxide laser, a YAG laser, an excimer laser, or the like is preferably used. When a resin sheet made of an acrylic resin system used for the light guide plate is cut, a carbon dioxide gas laser with an output of 10 W to 1200 W is used, and is cut at a cutting speed of 2 mm / second to 100 mm / second with a 2 mm thick plate.

  Thereafter, in the loading process 26, the cut individual light guide plates are loaded on a stocker (not shown).

  FIG. 5 shows the arrangement of the drum-shaped members. As shown in the figure, in the cutting step, a pair of hourglass-shaped members 92A that are opposed to each other with the resin sheet A interposed therebetween, and a pair of hourglass-shaped members 92B that are separated from each other by a certain distance are arranged. The interval between the pair of hourglass-shaped members 92B is narrower than the interval between the pair of hourglass-shaped members 92A. That is, the pair of drum-shaped members are arranged so that the distance between them gradually decreases in the transport direction.

  For example, if the distance between the pair of drum-shaped members is substantially the same as the width of the resin sheet, the resin sheet A may be clogged with a slight deviation, and product defects may occur. Even if the resin sheet is displaced while being conveyed by the conveyor belt 96, the distance between the pair of opposed drum-shaped members is gradually reduced, so that the resin is reached before reaching the laser cutting device 90A. The displacement of the sheet can be adjusted.

  FIG. 6 shows the configuration of the second restricting means for pressing the resin sheet. In order to prevent displacement of the resin sheet in the cutting process, a configuration of pressing with the belt 118 is provided.

  FIG. 7 shows the configuration of the third restricting means for pressing the resin sheet. In the cutting step, a blow device 120 capable of pressing the resin sheet A using wind pressure is provided above the conveyor belt 96. The blow device includes a large number of air outlets facing the resin sheet. The resin sheet A is pressed so as not to be displaced during traveling by the wind pressure of the air supplied from the air outlet. By pressing with the wind pressure of air, the resin sheet A can be uniformly pressed from above, and a light guide plate with good dimensional accuracy and cut surface quality can be produced by the laser light of the laser cutting device 90A.

  FIG. 8 shows the configuration of the fourth restricting means for pressing the resin sheet. In the cutting step, static electricity is applied to the conveyor belt 96, and the resin sheet A is brought into close contact with the conveyor belt 96 by the static electricity, so that the resin sheet A is pressed so as not to be displaced during traveling.

  An electrode 122 is provided on the back surface of the conveyor belt 96, and a charge supply terminal 124 for supplying a charge to the electrode 122 is provided at a position in contact with the electrode 122. The charge supply terminal 124 is connected to a power source (not shown). When a voltage is applied from the power source to the electrode 122 via the charge supply terminal 124, static electricity is charged on the conveyor belt 96, and the resin sheet A can be adsorbed to the conveyor belt 96 by static electricity. As a result, a light guide plate with good dimensional accuracy and cut surface quality can be produced by the laser light from the laser cutting device 90A.

  Moreover, FIG. 9 has shown the cutting area | region of the resin sheet cut | disconnected by a laser beam. When the resin sheet A has two thick portions, as shown in FIG. 9A, the resin sheet A is subjected to laser light from the laser cutting device 90A along a cutting line indicated by a broken line at the center. It is cut by. At this time, two light guide plates are simultaneously produced from the resin sheet A. On the other hand, as shown in FIG. 9A, when the laser beam is single, the light incident surface (cut surface) of the light guide plate comes into contact after the resin sheet A is cut, and the light incident surface may be damaged.

  Therefore, as shown in FIG. 9B, the resin sheet A includes a connection portion 130 that does not become a part of the light guide plate after cutting at the center. The connection portion 130 has a role of preventing the light guide plates from contacting each other after cutting. In other words, since a certain space is created by cutting the connecting portion 130, even if a deviation occurs in the traveling direction after cutting, it is possible to prevent the cut surfaces from coming into contact with each other and being damaged.

  In both methods of FIGS. 9A and 9B, the light incident surface of the light guide plate is formed by cutting the laser beam, so that the cut surface becomes a mirror surface and no polishing is required.

Explanatory drawing explaining an example of the shape of a light-guide plate Process drawing explaining the flow of the manufacturing method of the resin sheet of the light-guide plate to which this invention is applied Conceptual diagram of a light guide plate manufacturing apparatus to which the present invention is applied Explanatory drawing explaining 1st Example of a control means. Explanatory drawing explaining the arrangement state of a drum-shaped member Explanatory drawing explaining 2nd Example of a control means Explanatory drawing explaining 3rd Example of a control means Explanatory drawing explaining 4th Example of a control means Explanatory drawing which shows the cutting position of a resin sheet

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Raw material process, 12 ... Extrusion process, 14 ... Molding process, 16 ... Slow cooling process, 18 ... Warpage measurement process, 20 ... Control process, 22 ... Lamination process, 24 ... Cutting process, 26 ... Loading process, 28 ... Raw material Silo, 30 ... Additive silo, 32 ... Automatic metering machine, 34 ... Mixer, 36 ... Hopper, 38 ... Extruder, 40 ... Metering pump, 42 ... Feed pipe, 44 ... Die, 46 ... Mold roller, 48 ... Nip roller , Protrusion ... 48A, 50 ... peeling roller, 54 ... slow cooling zone, 55 ... heating zone 70 ... feed roller, 72 ... warp measuring device, 76 ... collection box, 82 ... reel, 84 ... protective film, 86 ... nip roller, 88 ... cutting machine, 90 ... cutting machine, 90A ... laser cutting device, 92 ... drum-shaped member, 94 ... roller, 96 ... conveyor belt

Claims (7)

A method of manufacturing a small sheet by cutting a resin sheet along a direction orthogonal to the conveyance direction and the conveyance direction,
Extruding the molten resin from the die into a sheet,
Sandwiching the extruded resin sheet between a mold roller and a nip roller, and molding the resin sheet to have a thickness distribution in the width direction;
Peeling the resin sheet from the mold roller;
Cutting the resin sheet along a direction perpendicular to the conveying direction;
Cutting the cut resin sheet with a laser beam along the conveying direction while pressing the regulating means, and forming a surface to be a light incident surface of the small piece sheet;
A method for producing a small piece sheet.   2. The method of manufacturing a small piece sheet according to claim 1, wherein the restricting means is a drum-shaped member that is disposed opposite to both edge portions of the resin sheet and has a thin central portion and thick both end portions.   A plurality of the drum-shaped members arranged opposite to each other are arranged, and an interval between the drum-shaped members arranged opposite to each other is gradually narrowed in a conveying direction of the resin sheet. Item 3. A method for producing a small piece sheet according to Item 2.   2. The method of manufacturing a small piece sheet according to claim 1, wherein the regulating means is a belt for pressing the resin sheet from above.   2. The method of manufacturing a small piece sheet according to claim 1, wherein the restricting means presses the resin sheet from above with wind pressure.   2. The method for manufacturing a small piece sheet according to claim 1, wherein the regulating means applies the static electricity to the resin belt so as to be in close contact with the transport belt.   The manufacturing method of the small piece sheet of Claims 1-6 is further equipped with the process of cut | disconnecting the both edge parts of a resin sheet with a laser beam before the process of cut | disconnecting the said resin sheet along the direction orthogonal to a conveyance direction. A method for manufacturing a small piece sheet.

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