WO2010029874A1 - Procédé de production d’une feuille de résine présentant une épaisseur inégale - Google Patents

Procédé de production d’une feuille de résine présentant une épaisseur inégale Download PDF

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Publication number
WO2010029874A1
WO2010029874A1 PCT/JP2009/065300 JP2009065300W WO2010029874A1 WO 2010029874 A1 WO2010029874 A1 WO 2010029874A1 JP 2009065300 W JP2009065300 W JP 2009065300W WO 2010029874 A1 WO2010029874 A1 WO 2010029874A1
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Prior art keywords
resin sheet
sheet
roller
resin
temperature
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PCT/JP2009/065300
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English (en)
Japanese (ja)
Inventor
卓弘 林
芳彦 佐野
勝本　隆一
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富士フイルム株式会社
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Publication of WO2010029874A1 publication Critical patent/WO2010029874A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91—Heating, e.g. for cross linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
    • B29C48/9155—Pressure rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/918—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B29C2071/022—Annealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/12—Dielectric heating
    • B29C35/14—Dielectric heating for articles of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/24—Calendering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/0063—After-treatment of articles without altering their shape; Apparatus therefor for changing crystallisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/256—Sheets, plates, blanks or films

Definitions

  • the present invention relates to a method for manufacturing an uneven thickness resin sheet, and more particularly to a method for manufacturing an uneven thickness resin sheet suitable for use in a light guide plate and various optical elements disposed on the back surface of various display devices.
  • a molten resin sheet extruded from a T-die is cooled by a cooling roll, and then cooled and solidified by air cooling in a conveyance unit while being taken up by a transaction roll, and is then cut by a cutting machine. Cut in the direction and formed into a sheet.
  • the resin sheet molded in this way tends to have residual strain due to temperature changes such as heating for melting and cooling for solidification during molding. For this reason, there is a problem that the shape is not stable due to a change with time, or the physical properties are not sufficiently exhibited.
  • a so-called annealing treatment is performed for the purpose of correcting residual strain relaxation or deformation of the thermoplastic resin molded article or for increasing the strength by promoting crystallization of the crystalline thermoplastic resin molded article.
  • the annealing treatment has a larger effect in a shorter time.
  • the resin melts and a molded body having a desired shape cannot be obtained. Therefore, in the case of a thermoplastic resin, it is generally annealed at a temperature 20 to 40 ° C. lower than the glass transition temperature Tg of the resin, and in the case of a crystalline resin, it is annealed at a temperature 10 to 20 ° C. higher than the highest temperature actually used. .
  • the annealing process is mainly used for products whose shape and dimensional accuracy are not strict.
  • it has been performed with a molded product having an almost isotropic shape.
  • a sheet-like molded product or the like is prone to deformation such as warping and undulation because the volume change behavior in the thickness direction and the length / width direction is different.
  • the size of the sheet is large, it is difficult to uniformly heat the surface during the temperature increase, and therefore deformation is likely to occur even with a non-uniform temperature increase rate.
  • the rate of temperature increase locally varies depending on the thickness, and thus deformation is more likely to occur.
  • Patent Document 1 discloses a method of preventing deformation due to annealing by setting and fixing a fixed plate on the side and upper and lower surfaces in a state where flat plates are laminated.
  • this method when the object is a flat plate, deformation due to annealing can be suppressed, but it cannot be applied to a sheet having a thickness distribution.
  • lamination takes time to transfer heat to the inside, the annealing time becomes long, and it takes time to set the annealing, so that productivity is remarkably lowered.
  • Patent Documents 2 and 3 disclose a method of continuously annealing using far infrared rays as a heating means.
  • JP 2005-47126 A Japanese Patent Publication No.7-112715 JP-A-11-172026
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for manufacturing an uneven thickness resin sheet that can further shorten the annealing process and improve the productivity.
  • a sheet forming process for forming a resin sheet by transferring to a resin sheet and solidifying by cooling, a peeling process for peeling the resin sheet from a peeling roller, and pulling and conveying with a take-up roller while heating the resin sheet with a heating device The transporting step and the glass transition temperature of the resin as Tg, the maximum temperature of the surface in the width direction of the resin sheet is (Tg ⁇ 40) ° C. to Tg ° C.
  • the step of cutting to a predetermined length and the resin sheet cut by the cutting means are continuously annealed at a temperature of (Tg-40) ° C. to Tg ° C. And annealing process of performing processing to provide a method for manufacturing uneven thickness resin sheet and having a.
  • the cutting step is performed in a state where the maximum temperature of the surface in the width direction of the resin sheet is (Tg ⁇ 40) ° C. or more and Tg ° C. or less, and the annealing step of the next step is also performed (Tg Since it is performed at a temperature of ⁇ 40) ° C. or more and Tg or less, there is no need to cool the resin sheet after the cutting step and before the annealing treatment step. For this reason, annealing treatment time can be reduced and productivity can be improved.
  • the second aspect of the present invention is characterized in that, in the first aspect, the annealing step is performed by supporting the resin sheet with a planar support member.
  • the resin sheet is supported by the flat support member and annealed, so that the resin sheet in a soft state at high temperature becomes flat due to its own weight, and the resin sheet is deformed. Can be easily corrected.
  • the difference in thickness between the thickest part and the thinnest part of the thickness distribution in the width direction of the resin sheet is 0.5 mm or more and 5 mm or less.
  • the temperature of the resin sheet can be easily adjusted in the transport process and the annealing process, Shape changes such as warping can be suppressed.
  • the manufacturing method of the uneven thickness resin sheet of the present invention since the temperature is maintained continuously from the cutting process to the annealing process, it is not necessary to cool the resin sheet. For this reason, the time of annealing treatment can be shortened and productivity can be improved.
  • FIG. 1 is a process diagram illustrating a flow of a method for producing a resin sheet to which the present invention is applied
  • FIG. 2 is a conceptual diagram of a resin sheet manufacturing apparatus to which the present invention is applied
  • FIG. 3 is a structural diagram showing the annealing process from the sheet forming process of the resin sheet manufacturing apparatus
  • FIG. 4A is a cross-sectional view showing an example of the shape of a resin sheet
  • FIG. 4B is a cross-sectional view showing another example of the shape of the resin sheet
  • FIG. 5 is a configuration diagram illustrating another aspect of the resin sheet manufacturing apparatus.
  • FIG. 1 is an overall process diagram of a method for producing a resin sheet according to the present invention
  • FIG. 2 is a conceptual diagram showing an apparatus configuration in each process.
  • the manufacturing method of the uneven thickness resin sheet of the present invention mainly includes a raw material process 100 for measuring and mixing raw materials and an extrusion process 112 for continuously extruding molten resin into a sheet (band). And a sheet forming step 114 for forming the resin sheet 14 by cooling and solidifying the extruded molten resin sheet 14a, a peeling step 115 for peeling the resin sheet 14, and a cutting step for cutting the peeled resin sheet 14 as the next step.
  • the raw material resin and the additive are respectively sent from the raw material silo 128 (or raw material tank) and the additive silo 130 (or additive tank) to the automatic weighing machine 132 and automatically metered.
  • the mixer 134 the raw material resin and the additive are mixed at a predetermined ratio.
  • thermoplastic resin can be used as the resin material of the raw material resin applied to the present invention.
  • PMMA polymethyl methacrylate resin
  • PC polycarbonate resin
  • PS polystyrene resin
  • MS resin AS resin
  • AS resin polypropylene resin
  • PE polyethylene resin
  • PET polyethylene terephthalate resin
  • PVC polyvinyl chloride
  • PVC resin
  • thermoplastic elastomer a copolymer thereof, and a cycloolefin polymer.
  • thermoplastic resins may contain light diffusing particles.
  • the light diffusing particles include inorganic materials such as silicone, silica, calcium carbonate, barium sulfate, aluminum hydroxide, titanium oxide, glass beads, and calcium silicate. Examples thereof include particles and polymethyl methacrylate particles.
  • the raw material resin appropriately weighed and mixed in the raw material process 100 is sent to the extrusion process 112.
  • the raw material resin mixed in the mixer 134 is charged into the extruder 138 through the hopper 136.
  • the raw material resin is melted while being kneaded by the extruder 138.
  • the extruder 138 may be either a single-screw extruder or a multi-screw extruder, and preferably includes a vent function that evacuates the interior of the extruder 138.
  • the raw material resin melted by the extruder 138 is sent to a die 12 (for example, a T die) through a supply pipe 142 by a metering pump 140 such as a screw pump or a gear pump.
  • the molten resin sheet 14 a extruded from the die 12 into a sheet is then sent to the sheet forming step 114.
  • the molten resin sheet 14 a extruded from the die 12 is sandwiched between the mold roller 16 and the nip roller 18.
  • the molten resin sheet 14a is cooled and solidified while being formed into a shape having a thickness distribution in the width direction.
  • the solidified resin sheet 14 is peeled off by the peeling roller 20 (peeling step).
  • the resin sheet 14 that has undergone the sheet forming step 114 is then sent to a conveying step 116.
  • the conveying step 116 is a step of conveying the resin sheet 14 peeled from the peeling roller 20 to the cutting step 124.
  • the conveyance is performed by the resin sheet being pulled by the take-up roll 24.
  • the resin sheet 14 is heated in the transport process, and the annealing process is performed using the remaining heat. Therefore, in the conveyance process, the temperature of the resin sheet is adjusted using a heating device.
  • the resin sheet 14 whose temperature is controlled and conveyed by the conveying step 116 is sent to the cutting step 124.
  • the cutting step 124 is a step of cutting the resin sheet 14 to a predetermined length. Moreover, it can also have the process of excising the width direction both ends (ear part) of the resin sheet 14.
  • a laser cutter, an electron beam cutting, an ultrasonic cutter, or the like can be used as the cutting means 174.
  • a guillotine-type cutting means composed of a receiving blade and a pressing blade can also be used.
  • the cutting step 124 can also include a step of cutting in the conveying direction at the joint of the shape.
  • the resin sheet 14 is formed into a predetermined shape in the sheet forming step 114, but both edge portions of the resin sheet 14 have a dimensional accuracy worse than that of the central portion in the shape, and a large residual distortion. Therefore, it is preferable to cut.
  • the cut portion is preferably cut at 20 to 30 mm at both ends of the resin sheet 14. As shown in FIG. 2, both edges of the resin sheet can be cut before cutting the resin sheet in a direction perpendicular to the conveying direction, or before cutting the sheet into a predetermined shape and performing an annealing treatment. It can also be cut.
  • a part of the cut resin sheet 14 is collected in a collection box 176, and the collected resin is discarded or reused.
  • the cut resin sheet 14 is conveyed to the annealing process 126 by the conveyor belt 196 driven by the roller 194.
  • the annealing process is provided to prevent a rapid temperature change of the resin sheet 14.
  • a sudden temperature change occurs in the resin sheet 14
  • the inside of the resin sheet 14 is in an elastic state while the vicinity of the surface of the resin sheet 14 is in a plastic state.
  • the surface shape of the sheet 14 is deteriorated. Further, there is a problem that a temperature difference occurs between the front and back surfaces of the resin sheet 14 and the resin sheet 14 is warped.
  • the resin sheet production line 10 includes a die 12 for shaping the raw material resin melted by the extruder 138 into a sheet shape, a mold roller 16 having an uneven thickness formed on the surface, and a mold roller 16 facing the mold roller 16.
  • the nip roller 18 is formed, the peeling roller 20 is disposed opposite to the mold roller 16, and the heating device 22 that controls the temperature of the resin sheet 14.
  • the sheet-shaped molten resin sheet 14 a extruded from the die 12 is pressed between the mold roller 16 and a nip roller disposed opposite to the mold roller 16, and the uneven shape inverted mold on the surface of the mold roller 16 is transferred to the resin sheet 14. Then, the resin sheet 14 is gradually cooled by being wound around a peeling roller 20 disposed opposite to the mold roller 16, and is transported in a state where distortion is removed.
  • the extrusion speed of the resin sheet 14 of the die 12 can be 0.1 to 50 m / min, preferably 0.3 to 30 m / min. Accordingly, the peripheral speed of the mold roller 16 is also substantially matched with this. In addition, it is preferable to control the speed unevenness of each roller within 1% with respect to the set value.
  • the pressing pressure of the nip roller 18 against the mold roller 16 should be 0 to 200 kN / m (kgf / cm) in terms of linear pressure (value converted assuming that the surface contact due to elastic deformation of each nip roller is linear contact). It is preferably 0 to 100 kN / m (kgf / cm).
  • a reverse shape for forming the uneven thickness resin sheet shown in FIGS. 4A and 4B is formed on the surface of the mold roller 16, for example.
  • 4A and 4B are cross-sectional views of the resin sheet 14 after molding. That is, the back surface of the resin sheet 14 is a flat surface, and a linear uneven shape surface parallel to the traveling direction is formed on the surface of the resin sheet 14. Therefore, an endless groove having a shape obtained by inverting the formed resin sheet 14 shown in FIGS. 4A and 4B may be formed on the surface of the mold roller 16.
  • the thickness of the uneven thickness resin sheet produced by the method for producing a resin sheet of the present invention is such that the thickness of the thickest part of the resin sheet is Dmax and the thickness of the thinnest part is Dmin.
  • the thickness difference Dmax ⁇ Dmin is preferably 0.5 mm or more and 5 mm or less, more preferably 0.5 mm or more and 3 mm or less. Further, as shown in FIG. 4B, the pitch L when there are two or more thick portions is preferably 200 mm or more, and more preferably 400 mm or more.
  • the material of the mold roller 16 includes various steel members, stainless steel, copper, zinc, brass, and a metal lining of these metal materials, and a rubber lining on the surface. These metal materials are HCr plated, Cu plated, Ni plated. Those plated with ceramics, ceramics, and various composite materials can be used.
  • the formation of the inverted saddle shape on the surface of the mold roller depends on the material of the roller surface, but generally a combination of cutting with an NC lathe and finishing buffing can be preferably employed. Also, other known processing methods (cutting, ultrasonic processing, electric discharge processing, etc.) can be employed.
  • the surface roughness of the mold roller surface is preferably 0.5 ⁇ m or less, and more preferably 0.2 ⁇ m or less, in terms of the center line average roughness Ra.
  • the mold roller 16 is rotationally driven at a predetermined peripheral speed by driving means (not shown).
  • the nip roller 18 is a roller that is disposed opposite to the mold roller 16 and clamps the resin sheet 14 with the mold roller 16.
  • the material of the nip roller 18 is a variety of steel members, stainless steel, copper, zinc, brass, a metal lining of these metal materials, a rubber lining on the surface, HCr plating, Cu plating, Ni plating, etc. on these metal materials These materials, ceramics, and various composite materials can be used.
  • the surface of the nip roller 18 is preferably processed into a mirror surface, and the center line average roughness Ra is preferably 0.5 ⁇ m or less, more preferably 0.2 ⁇ m or less.
  • the nip roller 18 is rotationally driven at a predetermined peripheral speed by a driving means (not shown).
  • a driving means not shown.
  • the structure which does not provide a drive means in the nip roller 18 is also possible, when the point which can make the back surface of the resin sheet 14 a favorable state is provided, it is preferable to provide a drive means.
  • the nip roller 18 is provided with a pressing means (not shown) so that the resin sheet 14 between the nip roller 18 and the mold roller 16 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 18 and the mold roller 16, and various known means such as a motor driving means, an air cylinder, and a hydraulic cylinder are employed. it can.
  • the nip roller 18 may be configured to be less likely to bend due to the reaction force of the clamping pressure.
  • a back-up roller (not shown) is provided on the back side of the nip roller 18 (opposite side of the mold roller 16), and a roller configuration is provided with a strength distribution that increases the rigidity of the central portion in the axial direction of the roller. , And combinations of these can be employed.
  • the peeling roller 20 is disposed opposite to the mold roller 16 and is a roller for peeling the resin sheet 14 from the mold roller 16 by winding the resin sheet 14, and is disposed 180 degrees downstream of the mold roller 16. .
  • the surface of the peeling roller 20 is preferably processed into a mirror surface. By setting it as such a surface, the back surface of the resin sheet 14 after a shaping
  • the surface roughness of the surface of the peeling roller is preferably 0.5 ⁇ m or less, more preferably 0.2 ⁇ m or less in terms of the center line average roughness Ra.
  • the material of the peeling roller 20 includes various steel members, stainless steel, copper, zinc, brass, and a metal lining of these metal materials, and a rubber lining on the surface.
  • the peeling roller 20 is rotationally driven in the direction of the arrow at a predetermined peripheral speed by a driving means (not shown).
  • a driving means not shown
  • the heating device 22 is installed in the vicinity of the mold roll, in the vicinity of the peeling roller, and on the lower surface side and the upper surface side of the resin sheet 14 in the conveying step.
  • the heating device 22 is not particularly limited as long as it is a non-contact type such as warm air, a far infrared heater, or a near infrared heater, but a far infrared heater is preferably used from the viewpoint of heating efficiency.
  • the heating by the heating device 22 is such that the maximum temperature of the surface in the width direction of the resin sheet 14 can be cut at a temperature of (Tg ⁇ 40) ° C. or higher when the glass temperature of the resin is Tg in the cutting in the cutting step 124.
  • Heat More preferably, it is (Tg-30) ° C. or higher.
  • the upper limit of the temperature during the cutting step is preferably Tg ° C. or lower, more preferably (Tg ⁇ 10) ° C. or lower.
  • the heating in the transporting process is first performed by the heating device 22c from the lower surface side (the surface side not having the mold) of the resin sheet 14 after being peeled off by the peeling roller 20. This is because if the resin sheet 14 is heated too much from the upper surface side (the surface side where the mold is attached), the resin sheet 14 is deformed by the subsequent heat shrinkage, and a resin sheet having a desired shape may not be obtained.
  • the surface temperature of the resin sheet 14 is equal to or higher than Tg, it is preferable to heat from the lower surface side of the resin sheet.
  • the resin sheet 14 is sent to the annealing process 126 after the cutting process 124.
  • the resin sheet 14 is placed on a flat surface with the flat side of the resin sheet facing down, and heat treatment is performed to correct deformation / warping of the resin sheet using its own weight, and to reduce residual distortion. It is a process of slow cooperation.
  • a configuration is adopted in which a horizontal tunnel shape is provided, temperature adjusting means is provided inside the tunnel, and the cooling temperature profile of the resin sheet can be controlled.
  • the temperature adjustment means a structure in which air (hot air or cold air) whose temperature is controlled from a plurality of nozzles is jetted toward the resin sheet 14, and a resin sheet by a heating means (nichrome wire heater, infrared heater, dielectric heating means, etc.)
  • a heating means such as the structure which heats the front and back surfaces of 14, respectively, can be adopted.
  • the support member for supporting the resin sheet 14 in the annealing treatment step a steel belt 198 as shown in FIG. 3 can be used, and a belt of heat-resistant fluororesin-impregnated fibers or a stainless chain can also be used. Since the direction in which the support member has flatness is reflected in the flatness of the resin sheet after the annealing treatment, the flatness of the support member may be 0.5 mm or less in the region where the resin sheet is supported. Preferably, it is 0.3 mm or less.
  • the ambient temperature (annealing temperature) in the annealing process 126 is preferably (Tg-40) ° C. or higher and (Tg-10) ° C. or lower, more preferably (Tg-30) ° C. or higher and (Tg-10) ° C. or lower.
  • the humidity is preferably in a dry state.
  • the temperature of the resin sheet is heated in the conveying step 116 so as to maintain (Tg ⁇ 40) ° C. or higher which is the temperature of the resin sheet in the cutting step 124. More preferably, it is (Tg-30) ° C. or higher.
  • the upper limit is preferably Tg ° C. or lower, more preferably (Tg ⁇ 10) ° C. or lower.
  • the resin sheet 14 is moved in the horizontal direction and the annealing treatment step 126 is performed. As shown in FIG. It is also possible to perform the annealing process by moving up and down one by one. By setting it as the said structure, even when the size of the resin sheet 14 becomes large, an installation can be reduced in size and an enlargement of an installation can be prevented.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L’invention concerne un procédé de production d’une feuille de résine présentant une épaisseur inégale, caractérisé en ce qu’il comprend : une étape d’extrusion dans laquelle une résine en fusion est extrudée depuis une filière en une forme de feuille ; une étape de formation de feuille dans laquelle la feuille de résine en fusion extrudée est intercalée entre un cylindre de filière et un cylindre pinceur pour transférer une forme de surface du cylindre de filière vers la feuille de résine en fusion, et cette feuille est refroidie et solidifiée pour former une feuille de résine ; une étape de démoulage dans laquelle la feuille de résine est démoulée depuis le cylindre de libération ; une étape de transport dans laquelle la feuille de résine est enlevée et transportée au moyen de cylindres d’enlèvement tout étant chauffée au moyen d’un appareil de chauffage ; une étape de découpe dans laquelle la feuille de résine est découpée selon une longueur donnée au moyen d'un dispositif de coupe lorsque la feuille de résine présente une température de surface maximale dans la direction de la largeur allant de (Tg-40) °C à Tg °C, à condition que Tg soit la température de transition vitreuse de la résine ; et une étape de recuisson dans laquelle la feuille de résine découpée à l’aide du dispositif de coupe est successivement recuite à une température allant de (Tg-40) °C à Tg °C.
PCT/JP2009/065300 2008-09-11 2009-09-02 Procédé de production d’une feuille de résine présentant une épaisseur inégale WO2010029874A1 (fr)

Applications Claiming Priority (2)

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JP2008-233376 2008-09-11
JP2008233376A JP4995163B2 (ja) 2008-09-11 2008-09-11 偏肉樹脂シートの製造方法

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WO2010029874A1 true WO2010029874A1 (fr) 2010-03-18

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CN103358557B (zh) * 2013-06-28 2015-04-08 苏州市新广益电子有限公司 热剥离聚乙烯薄膜胶带生产设备及其生产方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006256055A (ja) * 2005-03-16 2006-09-28 Fuji Photo Film Co Ltd 樹脂シートの製造方法
JP2007090859A (ja) * 2005-09-05 2007-04-12 Sony Corp 光学フィルムの製造方法
JP2007210161A (ja) * 2006-02-08 2007-08-23 Fujifilm Corp 樹脂シートの製造方法及び装置
JP2007210160A (ja) * 2006-02-08 2007-08-23 Fujifilm Corp 樹脂シートの製造方法
JP2008080727A (ja) * 2006-09-28 2008-04-10 Fujifilm Corp 樹脂シートの製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006256055A (ja) * 2005-03-16 2006-09-28 Fuji Photo Film Co Ltd 樹脂シートの製造方法
JP2007090859A (ja) * 2005-09-05 2007-04-12 Sony Corp 光学フィルムの製造方法
JP2007210161A (ja) * 2006-02-08 2007-08-23 Fujifilm Corp 樹脂シートの製造方法及び装置
JP2007210160A (ja) * 2006-02-08 2007-08-23 Fujifilm Corp 樹脂シートの製造方法
JP2008080727A (ja) * 2006-09-28 2008-04-10 Fujifilm Corp 樹脂シートの製造方法

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JP2010064386A (ja) 2010-03-25

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