WO2005030468A1 - Produit moule epais en forme de plaque plane et son procede de production - Google Patents

Produit moule epais en forme de plaque plane et son procede de production Download PDF

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Publication number
WO2005030468A1
WO2005030468A1 PCT/JP2004/014710 JP2004014710W WO2005030468A1 WO 2005030468 A1 WO2005030468 A1 WO 2005030468A1 JP 2004014710 W JP2004014710 W JP 2004014710W WO 2005030468 A1 WO2005030468 A1 WO 2005030468A1
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Prior art keywords
molded product
thickness
temperature
center
mold
Prior art date
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PCT/JP2004/014710
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English (en)
Japanese (ja)
Inventor
Masahiko Hayashi
Kazunori Ueki
Fumihiro Naruse
Original Assignee
Zeon Corporation
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Publication date
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Priority to JP2005514324A priority Critical patent/JPWO2005030468A1/ja
Publication of WO2005030468A1 publication Critical patent/WO2005030468A1/fr

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Classifications

    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C2045/7343—Heating or cooling of the mould heating or cooling different mould parts at different temperatures
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
    • B29C45/372—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings provided with means for marking or patterning, e.g. numbering articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms

Definitions

  • the present invention relates to a thick plate molded product and a method for producing the same. More specifically, the present invention is directed to a thick flat plate that is uniform in thickness from the center to the periphery, accurately transfers fine irregularities on the mold surface, and can be suitably used as an optical material. The present invention relates to a molded article and a method for producing the same. Background art
  • Injection molded products are widely used from general-purpose to precision applications such as daily necessities, automobile parts, home appliances parts, electronic parts, and optical equipment.
  • the quality of injection molded products and the quality of productivity largely depend on the quality of molds.
  • Production of injection molding dies requires advanced technology in all aspects, such as machining accuracy, uniform quality, and productivity.
  • the light diffusion plate and the light guide plate of the liquid crystal display device are flat plates having a simple shape, but in practice, they require extremely strict flatness and are required to have no thickness unevenness. It is not easy to produce an injection molded product with a uniform thickness even with a simple shape such as a flat plate, and various attempts have been made to produce an injection molded product with a uniform thickness. I have.
  • the parallelism of the fixed platen and the movable platen is set at A method has been proposed in which the temperature is adjusted in advance while being heated to a temperature corresponding to the platen temperature, and the platen is maintained at the temperature at which the parallelism is adjusted during injection molding (Patent Document 1).
  • Patent Document 1 the mold deforms due to the force of the mold clamping pressure and injection pressure, etc., especially in the case of large molded products, it is difficult to achieve parallelism only by temperature control. is there.
  • Injection molding dies have been proposed in which a plurality of ejector spaces are provided in accordance with the number and arrangement of cavities so as to suppress the radius (Patent Document 3).
  • Patent Document 3 such a method is effective for multi-cavity dies, but cannot be applied to large-sized single-cavity dies.
  • Patent Document 1 Japanese Patent Application Laid-Open No. H10-3223887 (Page 2, FIG. 1-2)
  • Patent Document 2 Japanese Patent Application Laid-Open No. 6-2700208 Kimitaka ⁇ (Page 2-3, Figure 1)
  • Patent Document 3 Japanese Patent Application Laid-Open No. 10-44 1997 ⁇ (No. 2, FIG. 1)
  • the present invention relates to a thick flat molded article which can transfer a fine uneven pattern on a mold surface accurately and has a uniform thickness from a central portion to a peripheral edge, and can be suitably used as an optical material, and its production. It is intended to provide a method.
  • the present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, when a thick flat molded product is manufactured by injection molding of a thermoplastic resin, the thickness of the peripheral portion of the thick flat molded product is reduced in the central portion. Therefore, when a thick flat molded product is used as a light guide plate of a liquid crystal display device, striped portions with different brightness, such as a bright line and a ⁇ ⁇ band, occur at the periphery of the screen.
  • ⁇ ⁇ is the maximum thickness of the flat molded product
  • T MIN is the minimum thickness of the flat molded product
  • T CENTER is the thickness of the center of the flat molded product.
  • a thick flat plate molded product having a gap value of 3% or less (2) a thick flat molded product according to item 1, wherein the gap value is 1% or less,
  • thermoplastic resin is a resin having an alicyclic structure.
  • thermoplastic resin is a metharyl resin or an alkyl (meth) acrylate monoaromatic compound.
  • the temperature of at least one pair of two opposite sides of the rectangular cavity of the injection molding die is determined by the temperature of the mold cavity. 7.Manufacturing the thick flat plate molded article according to any one of paragraphs 1 to 6, characterized in that the mold is heated so that the temperature is maintained at least 2 ° C higher than the maximum temperature at the center.
  • FIG. 1 is a schematic cross-sectional view of a thick flat plate molded product manufactured by an injection molding method.
  • Fig. 2 is an explanatory view of a screen of a liquid crystal display device
  • Fig. 3 is an explanatory view of a central part of a thick flat molded product
  • Fig. 4 is an embodiment of a method of heating the edge of a cavity in the method of the present invention.
  • the thick flat molded product of the present invention is a rectangular flat molded product of a thermoplastic resin produced by an injection molding method, wherein the difference between the maximum thickness and the minimum thickness is 3% or less of the thickness of the central portion. It is more preferably 2% or less, particularly preferably 1% or less.
  • the target to which the thick flat plate molded article of the present invention and the method for producing the same are applied but a large thick flat plate molding requiring strict flatness on the surface of a light guide plate, a light diffusion plate, a reflection plate, or the like.
  • the present invention can be suitably applied to a product, but can be particularly preferably applied to a light guide plate of a liquid crystal display device.
  • FIG. 1 is a schematic cross-sectional view of a thick plate molded product manufactured by an injection molding method.
  • a thick flat plate molded product is manufactured by the injection molding method, a molded product having a thicker edge 2 at the center 1 than at the center 1 is obtained.
  • a linear bright line 3 with high luminance is obtained.
  • the appearance of a dark band 4 with a weak band, etc. degrades the image quality.
  • the thick flat plate molded product of the present invention in which the difference between the maximum thickness and the minimum thickness is 3% or less of the thickness at the center as the light guide plate of the liquid crystal display device, the appearance quality without bright lines or dark bands is obtained. Good screen can be obtained.
  • the central portion of the thick flat molded product is the intersection of the diagonal lines of the rectangular thick flat molded product. If the thick flat plate product is not an accurate rectangular shape, the intersection of the diagonals of the rectangle formed by extending each side of the shape shall be the center. At this time, each side is extended to form a rectangle so that the total area of the part supplemented by the extension of each side and the part removed is minimized.
  • FIG. 3 is an explanatory view of the center of a thick flat plate molded product. As shown in the three examples in this figure, in each example, a rectangle is formed by extending each side as shown by a dotted line, and for example, each side is not extended as shown by a dashed line in the center figure.
  • the thickness of the central portion is preferably 3 to 50 mm, more preferably 5 to 20 mm.
  • Flat plate molded products with a thickness of less than 3 mm at the center have optical inconveniences such as bright lines and dark bands even if the difference between the maximum thickness and the minimum thickness exceeds 3 ° / 0 of the thickness at the center. It is unlikely to occur. It is not advisable to manufacture thick flat plate molded products with a central part thickness exceeding 5 Omm by injection molding method because it takes a long time to cool
  • thermoplastic resin used in the present invention is not particularly limited.
  • a resin having an alicyclic structure, a methacrylic resin and a (meth) acrylic acid ester-aromatic vinyl conjugated copolymer can be preferably used, and have an alicyclic structure.
  • Resins can be particularly preferably used.
  • the resin having an alicyclic structure has good fluidity S of the molten resin, so it can accurately transfer the fine irregularities on the mold cavity surface, and has extremely low hygroscopicity. It is excellent, does not warp a thick flat molded product, and has a small specific gravity, so that a large thick flat molded product can be reduced in weight.
  • the resin having an alicyclic structure examples include a polymer resin having an alicyclic structure in a main chain or a side chain.
  • a polymer resin having an alicyclic structure in its main chain can be particularly preferably used because of its good mechanical strength and heat resistance.
  • the alicyclic structure is preferably a saturated cyclic hydrocarbon structure, and its carbon number is preferably 4 to 30, more preferably 5 to 20, and more preferably 5 to 15. It is even better.
  • the proportion of the repeating unit having an alicyclic structure in the polymer resin having an alicyclic structure is preferably 50% by weight or more, more preferably 0% by weight or more, and 90% by weight. More preferably, it is the above.
  • Examples of the resin having an alicyclic structure include ring-opening polymers or ring-opening copolymers of nonolebornene monomers or hydrogenated products thereof, caropolymers or addition copolymers of norbornene monomers. Or their hydrogenated carohydrates, monocyclic cyclic olefins Polymer of monomer or hydrogenated product thereof, polymer of cyclic conjugated diene monomer or hydrogenated product thereof, polymer or copolymer of vinyl alicyclic hydrocarbon monomer or hydrogen thereof
  • Examples of the additive include a hydrogenated product of an unsaturated bond portion containing an aromatic ring of a vinyl aromatic hydrocarbon-based monomer or polymer.
  • hydrogenated products of the norbornene-based monomer polymer and hydrogenation power of the unsaturated bond portion containing the aromatic ring of the vinyl aromatic hydrocarbon-based polymer are mechanical Since it has excellent strength and heat resistance, it can be used particularly preferably.
  • methacrylic resin examples include those containing preferably at least 80 mol% of a repeating unit derived from methynole methacrylate based on all repeating units. Among them, 230 in accordance with ASTM D1238. C, the melt flow rate measured under a load of 37. 3 kg, methacryloyl resin of 0.5 to 20 g Z l 0 min is preferred.
  • the (meth) acrylic acid alkyl ester-aromatic vinyl conjugate copolymer is obtained by copolymerizing an aromatic vinyl compound and a (meth) acrylic acid alkyl ester compound having a lower alkyl group.
  • aromatic vinyl compound examples include styrene, permethylstyrene, m-methinorestylene, methynolestyrene, o-chloronostyrene, and p-chlorostyrene. These may be used alone or in combination of two or more.
  • Examples of the (meth) acrylic acid alkyl ester compound having a lower alkyl group include an alkyl group having 1 to 4 carbon atoms, preferably an alkyl ester of (meth) acrylic acid having an alkyl group having 1 to 2 carbon atoms, Specific examples include methyl methacrylate, methyl methacrylate, methyl acrylate, and ethyl acrylate. These may be used alone or in combination of two or more.
  • the proportion of each component constituting the copolymer is in the range of 95 to 5% by weight of the aromatic vinyl compound and 5 to 95% by weight of the (meth) acrylic acid / realkyl ester compound having a lower alkyl group. .
  • the aromatic vinyl conjugate is 60 to 20 weight by weight. /.
  • the content of the (meth) acrylic acid alkyl ester compound having a lower alkyl group is preferably in the range of 80 to 40% by weight.
  • the glass transition temperature TTg of the thermoplastic resin used in the present invention is at least 80 ° C, and preferably 90 to 250 ° C.
  • Glass transition temperature T g conforms to JISK 7 121 Measured by differential scanning calorimetry (DSC).
  • the above-mentioned resin may be used, if necessary, with other polymers, various compounding agents or fillers alone or in combination of two or more. it can.
  • Other polymers include rubbers or resins such as polybutadiene and polyacrylate.
  • Compounding agents include compounding agents such as antioxidants, ultraviolet spring absorbers, light stabilizers, near infrared absorbers, coloring agents such as dyes and pigments, lubricants, plasticizers, antistatic agents, and fluorescent brighteners.
  • the light guide plate is not necessarily required to be transparent, and light scattering ability can be imparted by blending fine particles comprising a polystyrene-based polymer, a polysiloxane-based polymer, or a crosslinked product thereof.
  • various compounding agents or fillers can be used alone or in combination of two or more, and the amount of their combination is appropriately selected within a range and a range that does not impair the object of the present invention. It is usually 0 to 5 parts by weight, preferably 0 to 3 parts by weight, based on 100 parts by weight of the plastic resin.
  • a thick flat molded product of the present invention when manufacturing a thick flat molded product of a thermoplastic resin by an injection molding method, at least one pair of two opposite ends of a rectangular cavity of an injection mold. Heat the mold so that the side temperature is maintained at least 2 ° C above the maximum temperature in the center of the mold cavity.
  • the temperature at the center of the cavity refers to the temperature at the center of the mold that comes into contact with the center of the thick flat plate product.
  • the temperature of the two opposite sides refers to the temperature of the two sides of the mold that comes into contact with the thick plate molded product. If there is a temperature distribution at the two ends, the lowest temperature must be maintained at least 2 ° C higher than the highest temperature in the center of the cavity.
  • FIG. 4 is an explanatory view showing one embodiment ′ of a method of heating the edge of the cavity in the method of the present invention.
  • a bar-shaped heater 6 made of a heating resistor is embedded in a pair of two opposite long sides of a mold cavity 5.
  • the temperature at the end of the cavity can be controlled.
  • two opposite long sides of the mold cavity are heated.
  • a bar-shaped heater is embedded in the other two sides, and the two pairs of the cavity are opposed to each other. You can also heat the four edges.
  • the end of the cavity There is no particular limitation on the method of heating the side.
  • a heating medium flow path is provided near the end of the cavity in the mold, and heating can be performed by passing a high-temperature heating medium.
  • the method of the present invention by making the temperature of at least one pair of opposed two ends of the mold cavity higher than the temperature of the center of the cavity, the peripheral portion of the thick flat plate molded product is prevented from being thickened. It is possible to obtain a thick flat plate molded product having a small thickness unevenness and excellent flatness.
  • the thick flat plate is a light guide plate, a fine prism pattern for diffusing light is provided on the light exit surface, and fine projections for controlling the direction of light reflection are provided on the reflective surface. In many cases, patterns are provided.
  • the molten resin sent from the gate into the cavity flows through the cavity and reaches the edge, filling the cavity.
  • the temperature of the molten resin drops while flowing in the cavity, and the transfer of fine irregularities on the mold tends to be incomplete at the edges of the cavity.
  • the method of the present invention by increasing the temperature of the edge of the cavity where the temperature of the molten resin is likely to decrease to be higher than the maximum temperature at the center of the cavity, it is possible to enhance the transferability of the fine uneven pattern of the mold. .
  • the method for controlling the temperature of the mold is not particularly limited.
  • high-temperature heat medium and low-temperature heat medium are switched and liquid is passed, and during injection, the mold temperature is raised to increase the fluidity and transferability of the molten resin.
  • the mold temperature can be lowered, shortening the molding cycle and improving productivity. If the mold temperature is controlled to be constant, that temperature will be the highest temperature in the center of the cavity. If the hot medium and the low-temperature medium are passed through by switching, the center of the cavity during one molding cycle Is the highest temperature in the center of the cavity.
  • the temperature of at least one pair of two opposite sides of the mold cavity is higher than the maximum temperature of the central part of the cavity by 2 ° C or more, more preferably 3 to 30 ° C, more preferably Is maintained at 5-20 ° C high. If the difference between the temperature at the edge of the mold cavity and the maximum temperature at the center of the cavity is less than 2 ° C, the effect of reducing the thickness unevenness of the thick flat molded product and the fine uneven pattern of the knob type Effect of accurately transferring din
  • Tg + 100 (° C) to Tg + 200 (° C) a resin temperature of usually Tg + 100 (° C) to Tg + 200 (° C), preferably Tg + 150 (.C) to Tg + 200 (° C), Tg—50 (° C), preferably at a mold temperature of Tg-30 (° C) to Tg (° C).
  • Tg is the glass transition temperature (unit: C) of the thermoplastic resin used.
  • the thick plate molded products were evaluated by the following methods.
  • the intersection of the diagonal lines of the light guide plate is set at the center, and on a straight line parallel to the short side passing through the center, from the end of the light guide plate by 0.1 mm, a non-contact three-dimensional measuring device [Mitaka Optical Co., Ltd. Measure the thickness using NH-1 3] and calculate the gap value by the following formula.
  • Gap value ⁇ (T MAX -T MIN ) ZT CENTER ⁇ XI 00
  • T MAX represents the maximum thickness of the light guide plate
  • T MIN represents the minimum thickness of the light guide plate
  • T CENTER represents the thickness of the central portion of the light guide plate.
  • h t is the theoretical height of the cylindrical protrusion which is calculated from the mold ( ⁇ ), gold Equal to the depth of the cylindrical cavity of the mold cavity.
  • a cold-cathode fluorescent lamp Lison Toshiba Lighting Co., Ltd., MBSM24 JN10W 370NLU] is attached to each of the two long sides of the light guide plate to assemble a liquid crystal display device. Inspection of appearance quality by paying attention to the belt Example 1
  • thermoplastic resin a norbornene-based polymer [Nippon Zeon Co., Ltd., ZE ONOR 106 OR, glass transition temperature 100 ° C], which is a kind of resin having an alicyclic structure, is used as an injection molding machine [Toshiba Machine ( Co., Ltd., IS 350GS, screw diameter 70 mm, clamping force 3,430 kN] were used to manufacture a 17-inch light guide plate by injection molding.
  • the dimensions of the molded product are 276.4 mm on the short side, 344.0 mm on the long side, and 8.0 mm in thickness.
  • the unit prisms were provided perpendicular to the long sides with the lower ends in contact with each other.
  • the surface of the cavity on the fixed side of the mold which is the reflecting surface of the light guide plate, has a hole that forms a cylindrical protrusion with a diameter of 80 ⁇ and a height of 80Aim, and a pitch between the two long sides of the cavity, 1 30 ⁇ . , And up to a pitch of 300 im near the long side. Adjacent to the two long sides of the mold cavity, one 800W bar heater was embedded. Also, a fan gate was set up on one short side of the cavity.
  • the molding temperature was 270 ° C
  • the mold temperature was 85 ° C
  • the temperature near the long side of the mold was 95 ° C
  • the injection time was 5 seconds
  • the holding pressure was 15 MPa after injection.
  • the light guide plate was injection molded in 120 seconds of cooling, 5 seconds of removal, and 140 seconds of molding cycle.
  • the mold temperature is adjusted by keeping the temperature of the hot water passing through the flow path in the mold at 80 ° C, and the temperature near the long side of the mold is controlled by controlling the voltage applied to the rod heater. Keep at 95 ° C.
  • the maximum temperature at the center of the mold cavity was 85 ° C
  • the temperature at the long side of the cavity was 95 ° C.
  • the maximum thickness of the obtained light guide plate was 8.01 lmm, the minimum thickness was 7.995 mm, the thickness at the center was 8.001 mm, and the gap value was 0.20%.
  • the average transfer rate was 89.5% and the standard deviation was 0.34%.
  • the maximum thickness of the obtained light guide plate was 8.018 mm, the minimum thickness was 7.989 mm, the thickness at the center was 8.005 mm, and the gap value was 0.36%.
  • the average transfer rate was 93.7% with a standard deviation of 0.18%.
  • Example 2 Same as Example 1 except that a methacrylic resin [Asahi Kasei Corporation, Delpet 80NH] was used as the thermoplastic resin instead of the resin having an alicyclic structure, and the molding temperature was set to 260 ° C. Under the conditions, the light guide plate was injection molded.
  • a methacrylic resin [Asahi Kasei Corporation, Delpet 80NH] was used as the thermoplastic resin instead of the resin having an alicyclic structure, and the molding temperature was set to 260 ° C. Under the conditions, the light guide plate was injection molded.
  • the maximum thickness of the obtained light guide plate was 8.025 mm, the minimum thickness was 7.994 mm, the thickness at the center was 8.015 mm, and the gap value was 0.39%.
  • the average transfer rate was 80.3% and the standard deviation was 1.50%.
  • thermoplastic resin instead of the resin having an alicyclic structure, an ester of methacrylic acid mono-aromatic vinylinole compound was used; f Nittetsu Chemical Co., Ltd., Estyrene MS-600] Injection molding of the light guide plate was performed under the same conditions as in Example 1.
  • the maximum thickness of the obtained light guide plate is 8.052 mm, the minimum thickness is 7.978 mm, the center Has a thickness of 8.040 mm and a gap value of 0.92. /. Met.
  • the average transfer rate was 82.4% and the standard deviation was 1.82%.
  • the light guide plate was injection-molded under the same conditions as in Example 1 except that the rod heater embedded adjacent to the two long sides of the mold cavity was removed and heating was not performed from the long side. .
  • the maximum temperature at the center of the mold cavity was 85 ° C, and the temperature at the long side of the cavity was 85 ° C.
  • the maximum thickness of the obtained light guide plate was 8.102 mm, the minimum thickness was 7.808 mm, the thickness at the center was 8.005 mm, and the gap value was 3.67%.
  • the average value of the transfer rate was 84.9%, and the standard deviation was 11.98%.
  • Table 1 shows the results of Examples 1 to 4 and Comparative Example 1.
  • Example 2 Alicyclic structure 90 95 0.36 93. 7 0.18 Good
  • Example 3 Methacryl 85 95 0.39 80. 3 1. 50 Good
  • the thick flat plate molded product of the present invention has a small thickness unevenness, has good flatness, and has an excellent appearance quality without a bright line or a dark band on a screen by being used as a light guide plate of a liquid crystal display device. Obtainable. According to the method of the present invention, by heating the end of the cavity of the injection molding die and raising the temperature of the end to be higher than the temperature of the center of the cavity, thickness unevenness is reduced and flatness is improved. A thick flat plate product can be easily manufactured.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

La présente invention a trait à un produit moulé épais rectangulaire en forme de plaque plane, produit par moulage par injection, comportant une résine thermoplastique et à un procédé de production du produit moulé. Dans le produit moulé, la différence entre l'épaisseur maximale et l'épaisseur minimale est égale ou inférieure à 3 % de l'épaisseur de la portion centrale, l'épaisseur depuis la portion centrale jusqu'à un bord périphérique est uniforme et régulière, un motif fin d'évidement/arête à la surface d'une matrice métallique peut être transférée avec précision au produit, et le produit moulé peut être utilisé de manière appropriée dans un matériau optique. Le procédé de production du produit moulé par moulage par injection comprend le chauffage d'une matrice métallique de sorte que la température d'au moins une paires de faces d'extrémité opposées d'une cavité rectangulaire de la matrice métallique soit maintenue à une température supérieure d'au moins de 2 °C à la température maximale de la portion centrale de la cavité de la matrice métallique.
PCT/JP2004/014710 2003-09-30 2004-09-29 Produit moule epais en forme de plaque plane et son procede de production WO2005030468A1 (fr)

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JP2017119401A (ja) * 2015-12-28 2017-07-06 株式会社クラレ 射出成形品の製造方法

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CN110103411A (zh) * 2019-04-24 2019-08-09 中国航发北京航空材料研究院 一种多次注射成型模具及应用该模具的注射成型方法

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JPH02160525A (ja) * 1988-12-14 1990-06-20 Idemitsu Petrochem Co Ltd 射出成形用金型及び該金型を用いたディスク基板の成形方法
JP2002046159A (ja) * 2000-05-26 2002-02-12 Sumitomo Chem Co Ltd パターンを有する大型導光板の製造方法
JP2003205540A (ja) * 2002-01-16 2003-07-22 Mitsubishi Cable Ind Ltd 樹脂長尺体成形金型及びその成形方法

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TW200526392A (en) 2005-08-16

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