WO2005018902A1 - Hollow molded product, method of manufacturing hollow molded product, and metal mold for hollow molding - Google Patents

Hollow molded product, method of manufacturing hollow molded product, and metal mold for hollow molding Download PDF

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Publication number
WO2005018902A1
WO2005018902A1 PCT/JP2004/011554 JP2004011554W WO2005018902A1 WO 2005018902 A1 WO2005018902 A1 WO 2005018902A1 JP 2004011554 W JP2004011554 W JP 2004011554W WO 2005018902 A1 WO2005018902 A1 WO 2005018902A1
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WO
WIPO (PCT)
Prior art keywords
hollow
fluid
molded product
hollow molded
molded article
Prior art date
Application number
PCT/JP2004/011554
Other languages
French (fr)
Japanese (ja)
Inventor
Yasuhiro Suzuki
Original Assignee
Suzuka Fuji Xerox Co., Ltd.
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Publication date
Application filed by Suzuka Fuji Xerox Co., Ltd. filed Critical Suzuka Fuji Xerox Co., Ltd.
Publication of WO2005018902A1 publication Critical patent/WO2005018902A1/en

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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
    • B29C45/26—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
    • 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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • 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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C2045/1717—Temperature controlled mould parts to control the location or configuration of the hollow

Definitions

  • the present invention relates to a hollow molded article molded by a hollow molding method of injecting (press-fitting) a pressurized fluid into a molten resin injected into a mold cavity and having a textured surface, a method for producing the same, And a mold for hollow molding for producing a hollow molded article.
  • gas-assist molding which is one of the hollow molding methods, can produce a hollow molded product without shrinkage and warpage (see, for example, Patent Document 1).
  • a passage for injecting a pressurized fluid into a molded article (hereinafter referred to as a “gas channel”) is provided from a fluid injection portion to the molded article to a substrate defining the molded article.
  • a rib having a width and a height larger than the wall thickness defining the thickness is formed (for example, see Patent Document 2).
  • Patent Document 1 Japanese Patent Publication No. 48-41264
  • Patent Document 2 JP-A-6-278155
  • Patent Document 3 JP-A-7-52183
  • the present invention has been made in view of such conventional problems, and improves the aesthetic appearance without providing a rib, and at a low cost without providing a material different from the mold material in the mold cavity. It is another object of the present invention to form a gas channel extending from a fluid injection part to a hollow part forming region so that a pressurized fluid can be reliably introduced.
  • a hollow portion is formed inside by injecting a pressurized fluid from a fluid injection portion, and a grain pattern is formed on at least a part of the front surface and / or the back surface.
  • a crimped pattern is formed linearly on the surface and / or back surface corresponding to the fluid flow path from the fluid injection part to the hollow part, so that the pressurized fluid can be placed at a desired position without ribs.
  • the shape of the fluid flow path projected on the front surface and the Z or the back surface is substantially the same as the shape formed by the grain pattern formed on the front surface and the Z or the back surface.
  • the hollow molded product according to claim 3 supplies a sufficient pressurized fluid to the hollow portion forming region by forming a plurality of linear crimp patterns on the front surface and Z or the back surface. Can be done.
  • the hollow molded article according to claim 4 is capable of supplying a sufficient pressurized fluid to the hollow part forming region by providing a plurality of fluid injection parts.
  • a grain pattern is formed on at least a part of the front surface and / or the back surface, and a pressurized fluid is injected from a fluid injection portion to form a hollow portion inside.
  • a grain pattern is linearly formed on the front surface and Z or the back surface from the vicinity of the fluid injection portion, and the pressurized fluid is injected from the fluid injection portion to form a line.
  • the pressurized fluid is guided along the grain pattern formed in the shape of a circle, and a hollow portion is formed at a desired position, so that a fluid flow path of the pressurized fluid is formed at a desired position without ribs, thereby enhancing the appearance and appearance.
  • a hollow molded article can be manufactured.
  • a sufficient pressurized fluid can be supplied to the hollow portion forming region.
  • the ability to supply is something that can be done.
  • the hollow molding die according to claim 8 includes a position for injecting the pressurized fluid into the mold cavity, and a hollow portion forming region for guiding the pressurized fluid from the injection position to form a hollow portion.
  • a mold for hollow molding having a fluid flow path forming area between the mold cavity surface of the fluid flow path forming area and the molded product from the injection position to a predetermined area extending to the hollow part forming area.
  • a hollow molding die capable of easily molding the above-mentioned hollow molded product. It can.
  • the grain pattern refers to a pattern formed by fine concaves and convexes appearing on the front surface, the Z surface, or the back surface of the molded product.
  • pear-faced grain sesame grain, mid-skin grain, small-skin grain, bark grain, wood-skin grain, cloth grain, arrow gas grain grain, Egypt grain, large Egypt grain, stone wall grain, and the like.
  • a force that depends on the size of the grain is applied to the mold cavity.
  • a matte grain with a depth of about 30 / m eg, a grain pattern sample from Tanako Hachiko TH-112-TH-121 is applied to the mold cavity.
  • the fluidity of the molten resin in the tee can be improved.
  • the air bubbles enter between the molten resin 4 and the mold 5 such that air 3 existing in the concave portion (valley) 2 of the grain pattern 1 is not pushed out by the flow of the molten resin 4 ( Formed).
  • the fluidity of the molten resin in the mold cavity can be improved. Therefore, the holding pressure effect at the time of solid molding, the gas pressure holding effect at the time of gas assist molding, and the like can be improved by delaying the cooling of the molten resin.
  • a portion that does not become an obstacle when the molded product is released from the mold is selected. If it is necessary to select a part that is likely to be an obstacle to demolding, change to a grain pattern and use a surface treatment with low thermal conductivity (painting, coating) or plating (plate) that has the same heat insulating effect. Can be applied to the mold cavity. For example, DLC using CVD, PVD, ceramic coats such as TiN, CrN, A1N, plating using fluorine resin as a suspension, silicon resin, and fluorine resin And the like.
  • thermoplastic resin used as a material of the hollow molded article is generally used for molding, and any type of thermoplastic resin can be used.
  • thermoplastic resins examples include polystyrene resins obtained by polymerizing styrene monomers, such as polystyrene (PS), high-impact polystyrene (HIPS, HiPS), nitrile monomers, and styrene monomers.
  • PS polystyrene
  • HIPS high-impact polystyrene
  • nitrile monomers such as atalylonitrile.
  • AS Styrene copolymer
  • nitrile monomer ⁇ Styrene monomer examples include polystyrene resins obtained by polymerizing styrene monomers, such as polystyrene (PS), high-impact polystyrene (HIPS, HiPS), nitrile monomers, and styrene monomers.
  • Styrene resin which is a copolymer with styrene, such as atalylonitrile.
  • Styrene copolymer (AS) nitrile mono
  • Resin consisting of butadiene rubber, such as acrylonitrile butadiene '' Styrene resins such as styrene copolymers (ABS, Ab S), polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyphenylene ether (PPE), polycarbonate (PC), polyamide (PA), polysulfone (PSF), polyetherimide (PEI), polymethyl methacrylate (PMMA) and other engineering plastics, polyethylene tereph It is a polyester resin such as tallate (PET) or polybutylene terephthalate (PBT), a vinyl resin such as bicarbon chloride (PVC), or a mixture of two or more of the above-mentioned thermoplastic resins.
  • ABS acrylonitrile butadiene '' Styrene resins
  • polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyphenylene ether (PPE), polycarbonate
  • the hollow molding method used in the present invention AGI of Asahi Chemical Industry, GPI, CGM, H 2 M, of Idemitsu Petrochemical GIM, Nippon Steel Chemical of PFP, UK Shin press, US GAIN Technol OGY, Germany
  • Gas assist molding method (hollow injection molding method) represented by national air mold and contool, and UCC method, USM method in the United States, TAF method developed by Toshiba Machinery and Asahi Dow, EX—CELL — ⁇ method, Hettinger's foam molding, New— SF, GCP method, Allied Chemical's technique, etc.
  • the foam molding method (foam injection molding method) represented by AMOTEC of Asahi Kasei Kogyo Co., Ltd. and the above-mentioned gas assist molding method combined with the gas assist molding method. It also applies to fused methods.
  • a molding resin in a molten state is injected into a cavity 42 formed by the upper mold 40 and the lower mold 41 shown in FIG.
  • a hollow molded product 20 was obtained.
  • Transparent ABS (Toyolac 920) (trade name) manufactured by Toray was used as the molding resin.
  • Fluid flow from gas injection pins 44 and 45 (fluid injection parts 22 and 23), which are injection positions of nitrogen gas as a pressurized fluid, to hollow part forming region 47 forming hollow part 24 of molded article 20
  • the mold cavity surface in the road forming region 48 is subjected to a process 46 for forming a grain pattern on the surface of the molded product.
  • a process of forming a linear matte texture 21 (TH-115) with a width of 15 mm on the surface of the hollow molded product 20 on a part of the mold cavity surface of the upper mold 40 is performed. Because of this, it was confirmed that the fluid flow path 25 was formed with a width of about 12-16 mm along the portion where the satin textures 21 were formed. In other words, the shape of the fluid flow path formed in the molded product projected on the surface of the molded product was substantially the same as the matte texture formed on the surface of the molded product.
  • Toyolac 920 (trade name) as a molding resin was injected into a mold cavity, and a hollow molded product 30 shown in Fig. 4 was obtained by gas assist molding.
  • the surface of the hollow molded product 30 is provided with a linear matte texture 31 (TH-115) having a width of 15 mm, and a gas injection pin (not shown) is installed in the fluid injection part 32, and nitrogen gas is injected. .
  • the hollow portion was formed with a width of about 16 to 20 mm along the portion where the pear-textured grain 31 was linearly formed.
  • the gas channel such as a rib was not provided in the molded product, the effect of introducing nitrogen gas, similar to the gas channel by the rib, could be obtained by adding a grain pattern to the molded product. did it.
  • Toyolac 920 (trade name) was injected into a mold cavity as a molding material, and as shown in Fig. 5 Then, a hollow molded product 10 having a plate thickness of 3 mm in which half of the surface was subjected to satin finish 12 (TH-115) by gas assist molding was obtained. On the back surface of the hollow molded product 10, a rib 13 having a height of 5 mm and a length of 350 mm is formed at the base at 60% of the thickness of the surface where the ribs stand (fillet). Nitrogen gas as a pressurized fluid was injected from the fluid injection unit 14.
  • the width of the hollow portion 15 is widened by 1830 mm, while the width of the grain pattern 12 is wider. It was confirmed that the width of the hollow portion 15 was extremely narrow, 5-8 mm, in the part without the space. Similar results were obtained when nitrogen gas was injected from the fluid injection unit 11.
  • TOYOLAC 920 (trade name) is injected into a mold cavity, and as shown in Fig. 6, a 15 mm wide linear satin-textured 51 (TH— 1 15) was applied to obtain a hollow molded product 50 having a thickness of 3 mm and a rib 54 having a width of 1.5 mm and a height of 5 mm provided on substantially half of the surface. Nitrogen gas as a pressurized fluid was injected from the fluid injection part 52.
  • the nitrogen gas travels along the linearly formed grain 51, and after arriving at the rib 54, travels along the rib 54. For this reason, the hollow portion 53 is formed along the grain 51 and the rib 54.
  • the width of the hollow portion 53 has a width S15 of 18 mm in the portion with the grain pattern 51, whereas the width of the hollow portion 53 has a width of 5 to 1 in the portion with the rib 54. It was confirmed that it became as narrow as 9 mm.
  • the grain pattern has the effect of facilitating the injection of the pressurized fluid because it is difficult to lower the temperature of the molten resin.
  • the force is not limited to a linear one as a grain pattern, but may be a curved one as long as it is a linear one.
  • FIG. 1 is an explanatory diagram of a function effect of a grain pattern.
  • FIG. 2 is a sectional view showing a mold for hollow molding. (Example 1)
  • FIG. 3 is a perspective view showing a hollow molded product. (Example 1)
  • FIG. 4 is a perspective view showing a hollow molded product. (Example 2)
  • FIG. 5 is a perspective view showing a hollow molded product. (Example 3)
  • FIG. 6 is a perspective view showing a hollow molded product. (Example 4)

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

[PROBLEMS] To solve a problem with a hollow molded product manufactured by filling gas into a molten resin, wherein a rib generally formed as a gas flow passage deteriorates the appearance of the hollow molded product by flashing produced when shrinkage, transfer presser, or hollow part is formed on the surface of the hollow molded product. [MEANS FOR SOLVING PROBLEMS] In the hollow molded product in which a hollow part is formed by filling a pressurized fluid from a fluid filling part, an embossed area is formed on a part of the front surface or rear surface thereof corresponding to the fluid flow passage starting at the fluid filling part to the hollow part. Thus, a function as a gas channel can be provided to the embossed area.

Description

明 細 書  Specification
中空成形品、中空成形品の製造方法および中空成形用金型  Hollow molded product, method for manufacturing hollow molded product, and mold for hollow molding
技術分野  Technical field
[0001] 本発明は、金型キヤビティ内に射出された溶融樹脂中に加圧流体を注入 (圧入）す る中空成形法で成形され、表面にシボ模様を有する中空成形品、その製造方法、お よび中空成形品を製造するための中空成形用金型に関するものである。  The present invention relates to a hollow molded article molded by a hollow molding method of injecting (press-fitting) a pressurized fluid into a molten resin injected into a mold cavity and having a textured surface, a method for producing the same, And a mold for hollow molding for producing a hollow molded article.
背景技術  Background art
[0002] 中空成形法の 1つであるガスアシスト成形は、引け、反りのない中空成形品を製造 できることが知られている（例えば、特許文献 1参照）。  [0002] It is known that gas-assist molding, which is one of the hollow molding methods, can produce a hollow molded product without shrinkage and warpage (see, for example, Patent Document 1).
このガスアシスト成形では、成形品内に加圧流体を注入するための通路（以下、「ガ スチャンネル」と称す）として、成形品への流体注入部から、成形品を規定する基体 に、基体を規定する肉厚より幅、高さの大きなリブを形成するのが一般的である（例え ば、特許文献 2参照)。  In this gas assist molding, a passage for injecting a pressurized fluid into a molded article (hereinafter referred to as a “gas channel”) is provided from a fluid injection portion to the molded article to a substrate defining the molded article. Generally, a rib having a width and a height larger than the wall thickness defining the thickness is formed (for example, see Patent Document 2).
[0003] しかし、このリブは、流体注入部から中空部が形成される領域 (以下、「中空部形成 領域」と称す）に至る成形品に若干のヒケゃ転写斑、中空部が形成される時の白化 等の外観を悪化させるという問題点がある。  [0003] However, with this rib, a slight sink mark and a hollow portion are formed in a molded product extending from a fluid injection portion to a region where a hollow portion is formed (hereinafter, referred to as a "hollow portion forming region"). There is a problem that the appearance such as whitening at the time is deteriorated.
また、機能上リブを設けることが困難な製品も多い。  Also, there are many products in which it is difficult to provide ribs functionally.
[0004] そこで、リブを無くし、成形品の流体注入部から中空部形成領域までの外観を向上 させるため、流体注入部から中空部形成領域へと伸びる中空成形用金型のキヤビテ ィ面の所定領域に、断熱材を設けた中空成形用金型が提案されている (例えば、特 許文献 3参照)。  [0004] Therefore, in order to eliminate the ribs and improve the appearance from the fluid injection portion to the hollow portion forming region of the molded product, a predetermined cavity surface of the hollow molding die extending from the fluid injecting portion to the hollow portion forming region is provided. A hollow molding die provided with a heat insulating material in a region has been proposed (for example, see Patent Document 3).
[0005] この中空成形用金型は、従来リブを形成していた位置に対応する金型キヤビティ位 置に断熱材を設けることにより、他の領域に充填された溶融樹脂よりも冷却を遅延さ せ、この冷却を遅延させた領域内に加圧流体を圧入してガスチャンネルを形成する というものである。  [0005] In this hollow molding die, by providing a heat insulating material at the die cavity position corresponding to the position where the rib was conventionally formed, the cooling is delayed more than the molten resin filled in other regions. Then, pressurized fluid is injected into the region where the cooling is delayed to form a gas channel.
特許文献 1：特公昭 48 - 41264号公報  Patent Document 1: Japanese Patent Publication No. 48-41264
特許文献 2：特開平 6— 278155号公報 特許文献 3 :特開平 7— 52183号公報 Patent Document 2: JP-A-6-278155 Patent Document 3: JP-A-7-52183
発明の開示  Disclosure of the invention
発明が解決しょうとする課題  Problems to be solved by the invention
[0006] しかし、この断熱材は、金型材料よりも熱伝導率が低いものでなければならないの で、金型材料とは異なる材料を金型キヤビティ内に設けなければならないとレ、う問題 力 sある。 [0006] However, since this heat insulating material must have a lower thermal conductivity than the mold material, a different material from the mold material must be provided in the mold cavity. There is power s .
つまり、高温 低温の温度サイクルを繰り返し、かつ高圧 低圧（大気圧）の圧力サ イタルを繰り返す過酷な環境の金型キヤビティ内に、金型材料とは異なる材料の断熱 材を設けることは、断熱材の剥がれ、劣化等により金型のメンテナンス頻度を高め、 中空成形品の生産コストを高めるという問題がある。  In other words, providing a heat-insulating material of a material different from the mold material in the mold cavity in a harsh environment in which the temperature cycle of high temperature and low temperature is repeated and the pressure cycle of high pressure and low pressure (atmospheric pressure) is repeated There is a problem that the frequency of maintenance of the mold is increased due to peeling and deterioration of the mold, and the production cost of the hollow molded product is increased.
[0007] 本発明は、このような従来の問題点に鑑みてなされたものであり、リブを設けず美観 を向上させ、かつ、金型キヤビティに金型材料とは異なる材料を設けず安価に、流体 注入部から中空部形成領域に至るガスチャンネルを形成し、確実に加圧流体を導く ことができるようにすることを目的とする。 [0007] The present invention has been made in view of such conventional problems, and improves the aesthetic appearance without providing a rib, and at a low cost without providing a material different from the mold material in the mold cavity. It is another object of the present invention to form a gas channel extending from a fluid injection part to a hollow part forming region so that a pressurized fluid can be reliably introduced.
課題を解決するための手段  Means for solving the problem
[0008] 請求項 1に記載の中空成形品は、流体注入部から加圧流体を注入することにより 内部に中空部が形成され、表面及び/又は裏面の少なくとも一部にシボ模様が形成 された中空成形品において、流体注入部から中空部に至る流体流路に対応する表 面及び/又は裏面にシボ模様が線状に形成されていることにより、リブが無ぐ所望 の位置に加圧流体の流体流路を形成した外観および美観を高めた中空成形品とす ること力 sできるものである。  [0008] In the hollow molded product according to claim 1, a hollow portion is formed inside by injecting a pressurized fluid from a fluid injection portion, and a grain pattern is formed on at least a part of the front surface and / or the back surface. In a hollow molded product, a crimped pattern is formed linearly on the surface and / or back surface corresponding to the fluid flow path from the fluid injection part to the hollow part, so that the pressurized fluid can be placed at a desired position without ribs. A hollow molded article with an improved appearance and aesthetic appearance, in which the fluid flow path is formed, can be used.
[0009] 請求項 2に記載の中空成形品は、流体流路を表面及び Z又は裏面に投影した形 状が、表面及び Z又は裏面に形成されたシボ模様が形成する形状と略同じであるこ とにより、リブが無ぐ所望の位置に加圧流体の流体流路を形成した外観および美観 を高めた中空成形品とすることができるものである。  [0009] In the hollow molded article according to claim 2, the shape of the fluid flow path projected on the front surface and the Z or the back surface is substantially the same as the shape formed by the grain pattern formed on the front surface and the Z or the back surface. Thus, it is possible to obtain a hollow molded article having an improved appearance and aesthetic appearance in which a fluid flow path for a pressurized fluid is formed at a desired position without ribs.
[0010] 請求項 3に記載の中空成形品は、表面及び Z又は裏面に線状に形成されたシボ 模様を複数本とすることにより、中空部形成領域に十分な加圧流体を供給することが できるものである。 [0011] 請求項 4に記載の中空成形品は、流体注入部を複数にすることにより、中空部形成 領域に十分な加圧流体を供給することができるものである。 [0010] The hollow molded product according to claim 3 supplies a sufficient pressurized fluid to the hollow portion forming region by forming a plurality of linear crimp patterns on the front surface and Z or the back surface. Can be done. [0011] The hollow molded article according to claim 4 is capable of supplying a sufficient pressurized fluid to the hollow part forming region by providing a plurality of fluid injection parts.
[0012] 請求項 5に記載の中空成形品の製造方法は、表面及び/又は裏面の少なくとも一 部にシボ模様が形成され、流体注入部から加圧流体を注入することにより内部に中 空部が形成された中空成形品の製造方法において、前記流体注入部の近傍からシ ボ模様を表面及び Z又は裏面に線状に形成し、流体注入部から加圧流体を注入す ることにより、線状に形成したシボ模様に沿って加圧流体を導き、所望の位置に中空 部を形成することにより、リブが無ぐ所望の位置に加圧流体の流体流路を形成した 外観および美観を高めた中空成形品を製造することができるものである。  [0012] In the method for manufacturing a hollow molded product according to claim 5, a grain pattern is formed on at least a part of the front surface and / or the back surface, and a pressurized fluid is injected from a fluid injection portion to form a hollow portion inside. In the method for manufacturing a hollow molded article having a formed therein, a grain pattern is linearly formed on the front surface and Z or the back surface from the vicinity of the fluid injection portion, and the pressurized fluid is injected from the fluid injection portion to form a line. The pressurized fluid is guided along the grain pattern formed in the shape of a circle, and a hollow portion is formed at a desired position, so that a fluid flow path of the pressurized fluid is formed at a desired position without ribs, thereby enhancing the appearance and appearance. A hollow molded article can be manufactured.
[0013] 請求項 6に記載の中空成形品の製造方法は、表面及び/又は裏面に線状に形成 されたシボ模様を複数本とすることにより、中空部形成領域に十分な加圧流体を供 給すること力 Sできるものである。  [0013] In the method for manufacturing a hollow molded product according to claim 6, by forming a plurality of linear crimped patterns on the front surface and / or the back surface, a sufficient pressurized fluid can be supplied to the hollow portion forming region. The ability to supply is something that can be done.
[0014] 請求項 7に記載の中空成形品の製造方法は、流体注入部を複数とすることにより、 中空部形成領域に十分な加圧流体を供給することができるものである。  [0014] In the method for manufacturing a hollow molded product according to claim 7, by providing a plurality of fluid injection portions, a sufficient pressurized fluid can be supplied to the hollow portion forming region.
[0015] 請求項 8に記載の中空成形用金型は、金型キヤビティへの加圧流体の注入位置と 、この注入位置から加圧流体を導いて中空部を形成する中空部形成領域との間に 流体流路形成領域が設けられた中空成形用金型において、流体流路形成領域の金 型キヤビティ面に、注入位置から中空部形成領域へと伸びる所定領域までの間に成 形品にシボ模様を形成する処理が施されていることにより、リブが無ぐ所望の位置に 加圧流体の流体流路を形成した外観および美観を高めた中空成形品を製造するこ とができるものである。  [0015] The hollow molding die according to claim 8 includes a position for injecting the pressurized fluid into the mold cavity, and a hollow portion forming region for guiding the pressurized fluid from the injection position to form a hollow portion. In a mold for hollow molding having a fluid flow path forming area between the mold cavity surface of the fluid flow path forming area and the molded product from the injection position to a predetermined area extending to the hollow part forming area. By performing the process of forming the grain pattern, it is possible to manufacture a hollow molded article having a pressurized fluid flow path formed at a desired position without ribs and having an improved appearance and appearance. is there.
発明の効果  The invention's effect
[0016] 成形品にシボ模様を付することにより、リブによるガスチャンネルと同様な効果を得 ることができるため、材料費を低減し、美観が向上した中空成形品とその製造方法を 提供すること力 Sできる。  [0016] By providing the molded article with a grain pattern, the same effect as a gas channel using ribs can be obtained, so that a hollow molded article with reduced material cost and improved aesthetic appearance and a method of manufacturing the same are provided. That can be S.
また、金型キヤビティ面に、成形品の一部または全部にシボ模様を形成する処理を 施すことにより、上記した中空成形品を容易に成形することができる中空成形金型を 提供すること力 Sできる。 発明を実施するための最良の形態 Further, by providing a mold cavity surface with a process of forming a grain pattern on a part or the whole of a molded product, a hollow molding die capable of easily molding the above-mentioned hollow molded product is provided. it can. BEST MODE FOR CARRYING OUT THE INVENTION
[0017] 〔シボ模様〕  [0017] [Textured pattern]
本発明における、シボ模様とは、成形品の表面及び Z又は裏面に表れた細かい凹 凸により形成された模様をいう。例えば、梨地シボ、ゴマシボ、中皮シボ、小皮シボ、 皮シボ、木皮シボ、布目シボ、矢ガスリシボ、エジプトシボ、大エジプトシボ、石垣シボ 等が挙げられる。  In the present invention, the grain pattern refers to a pattern formed by fine concaves and convexes appearing on the front surface, the Z surface, or the back surface of the molded product. For example, pear-faced grain, sesame grain, mid-skin grain, small-skin grain, bark grain, wood-skin grain, cloth grain, arrow gas grain grain, Egypt grain, large Egypt grain, stone wall grain, and the like.
〔シボ模様の作用〕  [Function of grain pattern]
[0018] これらのシボ模様を成形品に形成するために、金型キヤビティ面に処理を施した場 合の作用について説明する。  [0018] An operation in the case where a mold cavity surface is treated to form these grain patterns on a molded product will be described.
シボの大きさにも左右される力 深さ 30 / m程度の梨地シボ（例えば、棚沢八光社 のシボパターン見本 TH—112— TH—121)を金型キヤビティ面に施すと、金型キヤビ ティ内の溶融樹脂の流動性を良くすることができる。  A force that depends on the size of the grain. A matte grain with a depth of about 30 / m (eg, a grain pattern sample from Tanako Hachiko TH-112-TH-121) is applied to the mold cavity. The fluidity of the molten resin in the tee can be improved.
[0019] その理由は、シボ模様が施された金型キヤビティ面を溶融樹脂が流れると、シボ模 様を構成する凹凸と溶融樹脂との間に、複数の細かな気泡ができ、この気泡によって 断熱層（熱境膜と類似するもの）が形成されるからである。 [0019] The reason is that when the molten resin flows on the mold cavity surface provided with the grain pattern, a plurality of fine air bubbles are formed between the unevenness and the molten resin constituting the grain pattern, and the air bubbles cause this. This is because a heat insulating layer (similar to a thermal barrier film) is formed.
この気泡は、図 1に示すように、シボ模様 1の凹部 (谷部） 2に存在する空気 3が溶融 樹脂 4の流動によって押し出されることなぐ溶融樹脂 4と金型 5との間に入る (残る）こ とにより形成される。  As shown in FIG. 1, the air bubbles enter between the molten resin 4 and the mold 5 such that air 3 existing in the concave portion (valley) 2 of the grain pattern 1 is not pushed out by the flow of the molten resin 4 ( Formed).
[0020] また、前記した梨地シボ等のシボ模様を、成形品の表面及び/又は裏面の少なく とも一部に形成することで、金型キヤビティ内の溶融樹脂の流動性を向上させること ができるため、溶融樹脂の冷却遅延によって中実成形時の保圧効果、ガスアシスト 成形時のガス保圧効果等を向上させることができる。  [0020] Furthermore, by forming a grain pattern such as the above-mentioned matte grain on at least a part of the front surface and / or the back surface of the molded product, the fluidity of the molten resin in the mold cavity can be improved. Therefore, the holding pressure effect at the time of solid molding, the gas pressure holding effect at the time of gas assist molding, and the like can be improved by delaying the cooling of the molten resin.
[0021] ここで、表面又は裏面にシボ模様を施すに際し、成形品が金型から離型する場合 の障害とならない箇所を選択する。離型の障害となりそうな箇所を選択せざるを得な い場合は、シボ模様に変えて、同様な断熱の作用効果を持つ熱伝導率の低い表面 処理 (ペインティング、コーティング）又は鍍金（プレーティング）を金型キヤビティ面に 採用することができる。例えば、 CVD、 PVDを用いた DLC、 TiN、 CrN、 A1N等のセ ラミックコート、弗素樹脂をサスペンジョンとした鍍金、シリコン樹脂、弗素樹脂を主成 分とした塗装等があげられる。 Here, when applying a grain pattern to the front surface or the back surface, a portion that does not become an obstacle when the molded product is released from the mold is selected. If it is necessary to select a part that is likely to be an obstacle to demolding, change to a grain pattern and use a surface treatment with low thermal conductivity (painting, coating) or plating (plate) that has the same heat insulating effect. Can be applied to the mold cavity. For example, DLC using CVD, PVD, ceramic coats such as TiN, CrN, A1N, plating using fluorine resin as a suspension, silicon resin, and fluorine resin And the like.
〔熱可塑性樹脂〕  〔Thermoplastic resin〕
[0022] 本発明において、中空成形品の材料として使用する熱可塑性樹脂としては、一般 的に成形に用いられてレ、る熱可塑性樹脂であれば種類を問わなレ、。  In the present invention, the thermoplastic resin used as a material of the hollow molded article is generally used for molding, and any type of thermoplastic resin can be used.
熱可塑性樹脂を例示すれば、スチレン系単量体を重合せしめて成るポリスチレン系 樹脂、例えばポリスチレン (PS)、耐衝撃性ポリスチレン（HIPS、 HiPS)、二トリル系 単量体、スチレン系単量体との共重合体であるスチレン系樹脂、例えば、アタリロニト リル .スチレン共重合体（AS)、二トリル系単量体 'スチレン系単量体 .ブタジエン系ゴ ムから成る樹脂、例えば、アクリロニトリル 'ブタジエン 'スチレン共重合体 (ABS、 Ab S)等のスチレン系樹脂、ポリエチレン（PE)、ポリプロピレン（PP)等に代表されるポリ ォレフィン系樹脂、ポリフエ二レンエーテル（PPE)、ポリカーボネート（PC)、ポリアミド (PA)、ポリスルフォン（PSF)、ポリエーテルイミド（PEI)、ポリメチルメタタリレート（P MMA)等のエンジニアリングプラスチック、ポリエチレンテレフタレート（PET)、ポリブ チレンテレフタレート（PBT)等のポリエステル樹脂、塩化ビエル（PVC)等のビニル 系樹脂等、或いは前記熱可塑性樹脂の二種以上の混合物である。  Examples of thermoplastic resins include polystyrene resins obtained by polymerizing styrene monomers, such as polystyrene (PS), high-impact polystyrene (HIPS, HiPS), nitrile monomers, and styrene monomers. Styrene resin which is a copolymer with styrene, such as atalylonitrile. Styrene copolymer (AS), nitrile monomer 樹脂 Styrene monomer. Resin consisting of butadiene rubber, such as acrylonitrile butadiene '' Styrene resins such as styrene copolymers (ABS, Ab S), polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyphenylene ether (PPE), polycarbonate (PC), polyamide (PA), polysulfone (PSF), polyetherimide (PEI), polymethyl methacrylate (PMMA) and other engineering plastics, polyethylene tereph It is a polyester resin such as tallate (PET) or polybutylene terephthalate (PBT), a vinyl resin such as bicarbon chloride (PVC), or a mixture of two or more of the above-mentioned thermoplastic resins.
〔成形加工法〕  (Molding method)
[0023] 本発明で使用される中空成形法は、旭化成工業の AGI、 GPI、 CGM、 H2M、出光 石油化学の GIM、新日鉄化学の PFP、英国のシンプレス、米国の GAIN Technol ogy、独国のエアーモールド、コンツールなどに代表されるガスアシスト成形法（中空 射出成形法）、及び米国の UCC法、 USM法、或いは、東芝機械と旭ダウとが開発し た TAF法、 EX— CELL—〇社法、へッティンガーの発泡成形や、 New— SF、 GCP法 、ァライドケミカル社の技法等、更に超臨界状態の気態（体)を用いた米国 トレクセ ル社の MuCell (ミューセル）や旭化成工業の AMOTECに代表される発泡成形法（ 発泡射出成形法）と前記ガスアシスト成形法と融合された方法、更には住友化学の S Pモーノレド、インモールド成形法との前記ガスアシスト成形法とを融合させた方法にも 適用される。 [0023] The hollow molding method used in the present invention, AGI of Asahi Chemical Industry, GPI, CGM, H 2 M, of Idemitsu Petrochemical GIM, Nippon Steel Chemical of PFP, UK Shin press, US GAIN Technol OGY, Germany Gas assist molding method (hollow injection molding method) represented by national air mold and contool, and UCC method, USM method in the United States, TAF method developed by Toshiba Machinery and Asahi Dow, EX—CELL —〇 method, Hettinger's foam molding, New— SF, GCP method, Allied Chemical's technique, etc. The foam molding method (foam injection molding method) represented by AMOTEC of Asahi Kasei Kogyo Co., Ltd. and the above-mentioned gas assist molding method combined with the gas assist molding method. It also applies to fused methods.
[0024] それ以外には、発泡射出成形、或いは従来から実施されている中実 (ソリッド)成形 への適用も可能で、溶融樹脂の流動面にシボ加工を施す事で溶融樹脂の流動性を 向上させることができる。 [0024] In addition, it is also applicable to foam injection molding or solid molding which has been conventionally performed, and the flowability of the molten resin is increased by subjecting the flow surface of the molten resin to embossing. Can be improved.
実施例 1  Example 1
[0025] 図 2に示した上型 40と下型 41で形成されるキヤビティ 42に、溶融状態の成形用樹 脂を、樹脂注入部 43から射出し、ガスアシスト成形法により、図 3に示す中空成形品 20を得た。成形用樹脂として、東レ製の透明 ABS (トヨラック 920) (商品名）を使用し た。  [0025] A molding resin in a molten state is injected into a cavity 42 formed by the upper mold 40 and the lower mold 41 shown in FIG. A hollow molded product 20 was obtained. Transparent ABS (Toyolac 920) (trade name) manufactured by Toray was used as the molding resin.
[0026] 加圧流体としての窒素ガスの注入位置であるガス注入ピン 44及び 45 (流体注入部 22及び 23)から、成形品 20の中空部 24を形成する中空部形成領域 47に至る流体 流路形成領域 48における金型キヤビティ面には、成形品の表面にシボ模様を形成 する処理 46が施されてレ、る。  [0026] Fluid flow from gas injection pins 44 and 45 (fluid injection parts 22 and 23), which are injection positions of nitrogen gas as a pressurized fluid, to hollow part forming region 47 forming hollow part 24 of molded article 20 The mold cavity surface in the road forming region 48 is subjected to a process 46 for forming a grain pattern on the surface of the molded product.
[0027] 本実施例においては、上型 40の金型キヤビティ面の一部に、中空成形品 20の表 面に 15mmの幅で線状の梨地シボ 21 (TH-115)を形成する加工が施されているた め、梨地シボ 21が形成された部分に沿って、流体流路 25が約 12— 16mmの幅で形 成されることを確認できた。つまり、成形品に形成された流体流路を、成形品の表面 に投影した形状が、成形品の表面に形成した梨地シボと略同じであつた。  In the present embodiment, a process of forming a linear matte texture 21 (TH-115) with a width of 15 mm on the surface of the hollow molded product 20 on a part of the mold cavity surface of the upper mold 40 is performed. Because of this, it was confirmed that the fluid flow path 25 was formed with a width of about 12-16 mm along the portion where the satin textures 21 were formed. In other words, the shape of the fluid flow path formed in the molded product projected on the surface of the molded product was substantially the same as the matte texture formed on the surface of the molded product.
[0028] 以上より、線状にシボ模様を施すことにより、シボ模様を施した部分の溶融樹脂の 冷却が遅くなり、シボ模様に沿って窒素ガスの流路が形成されることが確認できた。 実施例 2  [0028] From the above, it was confirmed that, by applying a linear grain pattern, the cooling of the molten resin in the grain-patterned portion was delayed, and a nitrogen gas flow path was formed along the grain pattern. . Example 2
[0029] 成形用樹脂としてトヨラック 920 (商品名）を金型キヤビティに射出し、ガスアシスト成 形により、図 4に示す中空成形品 30を得た。該中空成形品 30は、表面に 15mmの 幅で線状の梨地シボ 31 (TH-115)が施されており、流体注入部 32に図示しないガ ス注入ピンを設置し、窒素ガスを注入した。  [0029] Toyolac 920 (trade name) as a molding resin was injected into a mold cavity, and a hollow molded product 30 shown in Fig. 4 was obtained by gas assist molding. The surface of the hollow molded product 30 is provided with a linear matte texture 31 (TH-115) having a width of 15 mm, and a gas injection pin (not shown) is installed in the fluid injection part 32, and nitrogen gas is injected. .
その結果、線状に梨地シボ 31を施した部分に沿って、中空部が約 16— 20mmの 幅で形成されることを確認できた。すなわち、成形品にリブ等のガスチャンネルが設 けられていない場合でも、成形品にシボ模様を付することにより、リブによるガスチヤ ンネルと同様な、窒素ガスを導くという効果が得られることを確認できた。  As a result, it was confirmed that the hollow portion was formed with a width of about 16 to 20 mm along the portion where the pear-textured grain 31 was linearly formed. In other words, it was confirmed that even when the gas channel such as a rib was not provided in the molded product, the effect of introducing nitrogen gas, similar to the gas channel by the rib, could be obtained by adding a grain pattern to the molded product. did it.
実施例 3  Example 3
[0030] トヨラック 920 (商品名）を成形材料として、金型キヤビティに射出し、図 5に示すよう に、ガスアシスト成形により、表面の半分に梨地シボ 12 (TH— 115)を施した板厚 3m mの中空成形品 10を得た。この中空成形品 10の裏面には、根元の厚さはリブが立 つている面（天肉）の 60%で、高さ 5mm、長さ 350mmのリブ 13が形成されている。 また、加圧流体としての窒素ガスは、流体注入部 14から注入した。 [0030] Toyolac 920 (trade name) was injected into a mold cavity as a molding material, and as shown in Fig. 5 Then, a hollow molded product 10 having a plate thickness of 3 mm in which half of the surface was subjected to satin finish 12 (TH-115) by gas assist molding was obtained. On the back surface of the hollow molded product 10, a rib 13 having a height of 5 mm and a length of 350 mm is formed at the base at 60% of the thickness of the surface where the ribs stand (fillet). Nitrogen gas as a pressurized fluid was injected from the fluid injection unit 14.
[0031] リブ 13付近での中空部 15が形成されている状態を確認した結果、シボ模様 12の ある部分では、中空部 15の幅が 18 30mmの広がりがあるのに対し、シボ模様 12 のない部分では、中空部 15の幅が 5— 8mmと極端に狭くなるのが確認された。窒素 ガスを、流体注入部 11から注入した場合も、同様な結果を得ることができた。 [0031] As a result of confirming the state in which the hollow portion 15 is formed near the rib 13, in a portion having the grain pattern 12, the width of the hollow portion 15 is widened by 1830 mm, while the width of the grain pattern 12 is wider. It was confirmed that the width of the hollow portion 15 was extremely narrow, 5-8 mm, in the part without the space. Similar results were obtained when nitrogen gas was injected from the fluid injection unit 11.
実施例 4  Example 4
[0032] トヨラック 920 (商品名）を成形材料として、金型キヤビティに射出し、図 6に示すよう に、ガスアシスト成形により、表面の略半分に幅 15mmの線状の梨地シボ 51 (TH—1 15)を施し、表面の略半分に幅が 1. 5mmで高さが 5mmのリブ 54を設けた板厚 3m mの中空成形品 50を得た。加圧流体としての窒素ガスは、流体注入部 52から注入し た。  [0032] As a molding material, TOYOLAC 920 (trade name) is injected into a mold cavity, and as shown in Fig. 6, a 15 mm wide linear satin-textured 51 (TH— 1 15) was applied to obtain a hollow molded product 50 having a thickness of 3 mm and a rib 54 having a width of 1.5 mm and a height of 5 mm provided on substantially half of the surface. Nitrogen gas as a pressurized fluid was injected from the fluid injection part 52.
[0033] 窒素ガスは線状に形成されたシボ 51に沿って進み、かつリブ 54に到達後は、リブ 5 4に沿って進む。このため、中空部 53は、シボ 51およびリブ 54に沿って形成される。 この中空部 53の状態を確認した結果、シボ模様 51のある部分では、中空部 53の幅 力 S15 18mmの広がりがあるのに対し、リブ 54のある部分では、中空部 53の幅が 5 一 9mmと狭くなるのが確認された。  The nitrogen gas travels along the linearly formed grain 51, and after arriving at the rib 54, travels along the rib 54. For this reason, the hollow portion 53 is formed along the grain 51 and the rib 54. As a result of confirming the state of the hollow portion 53, the width of the hollow portion 53 has a width S15 of 18 mm in the portion with the grain pattern 51, whereas the width of the hollow portion 53 has a width of 5 to 1 in the portion with the rib 54. It was confirmed that it became as narrow as 9 mm.
窒素ガスを、リブ 54の端部から注入した場合も、同様な結果を得ることができた。  Similar results could be obtained when nitrogen gas was injected from the end of the rib 54.
[0034] 以上より、シボ模様は、溶融樹脂の温度を低下させにくいので、加圧流体の注入を 容易にするという作用効果があるといえる。  From the above, it can be said that the grain pattern has the effect of facilitating the injection of the pressurized fluid because it is difficult to lower the temperature of the molten resin.
[0035] 前記した実施例は、説明のために例示したものであって、本発明としてはそれらに 限定されるものではなぐ特許請求の範囲、発明の詳細な説明および図面の記載か ら当業者が認識することができる本発明の技術的思想に反しない限り、変更および 付加が可能である。  [0035] The above-described embodiments are exemplifications for explanation, and the present invention is not limited to those described in the claims, the detailed description of the invention, and the drawings. Modifications and additions can be made without departing from the technical idea of the present invention that can be recognized.
[0036] 例えば、前記した実施例においては、シボ模様として直線状のものを示した力 こ れに限られず、線状のものであれば、曲線状のものでも良い。 産業上の利用可能性 For example, in the above-described embodiment, the force is not limited to a linear one as a grain pattern, but may be a curved one as long as it is a linear one. Industrial applicability
[0037] 成形品にリブによるガスチャンネルが設けられていない場合でも、成形品にシボ模 様を付することにより、リブと同様な結果を得ることができるため、美観を向上させた中 空成形品に適用することができる。  [0037] Even when the molded product does not have a gas channel formed by ribs, the same result as that of the rib can be obtained by applying a grain pattern to the molded product. Can be applied to goods.
図面の簡単な説明  Brief Description of Drawings
[0038] [図 1]シボ模様の作用効果の説明図である。  FIG. 1 is an explanatory diagram of a function effect of a grain pattern.
[図 2]中空成形用金型を示した断面図である。 （実施例 1)  FIG. 2 is a sectional view showing a mold for hollow molding. (Example 1)
[図 3]中空成形品を示した斜視図である。 （実施例 1)  FIG. 3 is a perspective view showing a hollow molded product. (Example 1)
[図 4]中空成形品を示した斜視図である。 （実施例 2)  FIG. 4 is a perspective view showing a hollow molded product. (Example 2)
[図 5]中空成形品を示した斜視図である。 （実施例 3)  FIG. 5 is a perspective view showing a hollow molded product. (Example 3)
[図 6]中空成形品を示した斜視図である。 （実施例 4)  FIG. 6 is a perspective view showing a hollow molded product. (Example 4)
符号の説明  Explanation of symbols
[0039] 20 中空成形品 [0039] 20 Hollow molded product
21 シボ模様  21 Texture
22 流体注入部  22 Fluid injection section
23 流体注入部  23 Fluid injection section
24 中空部  24 hollow
25 流体流路  25 Fluid flow path
26 表面  26 surface

Claims

請求の範囲 The scope of the claims
[1] 流体注入部から加圧流体を注入することにより内部に中空部が形成され、表面及 び/又は裏面の少なくとも一部にシボ模様が形成された中空成形品において、 前記流体注入部から前記中空部に至る流体流路に対応する前記表面及び Z又は 前記裏面に前記シボ模様が線状に形成されていることを特徴とする中空成形品 [1] A hollow molded article in which a hollow portion is formed by injecting a pressurized fluid from a fluid injection portion and a grain pattern is formed on at least a part of a front surface and / or a back surface, wherein: A hollow molded product, wherein the grain pattern is formed in a linear shape on the front surface and the Z corresponding to the fluid flow path leading to the hollow portion or the back surface.
[2] 前記流体流路を前記表面及び/又は前記裏面に投影した形状が、前記表面及び[2] The shape in which the fluid flow path is projected on the front surface and / or the rear surface is such that
/又は前記裏面に形成されたシボ模様が形成する形状と略同じであることを特徴と する請求項 1に記載の中空成形品 2. The hollow molded article according to claim 1, wherein the shape is substantially the same as a shape formed by a grain pattern formed on the back surface. 3.
[3] 前記表面及び/又は前記裏面に線状に形成された前記シボ模様が、複数本ある ことを特徴とする請求項 1又は請求項 2に記載の中空成形品 [3] The hollow molded article according to claim 1 or 2, wherein a plurality of the grain patterns are formed in a linear shape on the front surface and / or the rear surface.
[4] 前記流体注入部が複数あることを特徴とする請求項 1、請求項 2又は請求項 3に記 載の中空成形品 [4] The hollow molded article according to claim 1, 2, or 3, wherein there are a plurality of the fluid injection portions.
[5] 表面及び/又は裏面の少なくとも一部にシボ模様が形成され、流体注入部から加 圧流体を注入することにより内部に中空部が形成された中空成形品の製造方法にお いて、  [5] In a method for manufacturing a hollow molded article in which a grain pattern is formed on at least a part of the front surface and / or the back surface and a hollow portion is formed inside by injecting a pressurized fluid from a fluid injection portion,
前記流体注入部の近傍からシボ模様を表面及び/又は裏面に線状に形成し、 前記流体注入部から加圧流体を注入することにより、前記線状に形成したシボ模 様に沿って加圧流体を導き、  A crimped pattern is linearly formed on the front surface and / or the back surface from the vicinity of the fluid injecting section, and a pressurized fluid is injected from the fluid injecting section to pressurize along the linearly formed grain pattern. Guide the fluid,
所望の位置に中空部を形成することを特徴とする中空成形品の製造方法  A method of manufacturing a hollow molded article, wherein a hollow portion is formed at a desired position.
[6] 前記表面及び/又は前記裏面に線状に形成された前記シボ模様が、複数本ある ことを特徴とする請求項 5に記載の中空成形品の製造方法 6. The method for producing a hollow molded product according to claim 5, wherein there are a plurality of the grain patterns linearly formed on the front surface and / or the rear surface.
[7] 前記流体注入部が複数あることを特徴とする請求項 5又は請求項 6に記載の中空 成形品の製造方法 7. The method for producing a hollow molded article according to claim 5, wherein there are a plurality of the fluid injection portions.
[8] 金型キヤビティへの加圧流体の注入位置と、該注入位置から前記加圧流体を導い て中空部を形成する中空部形成領域との間に流体流路形成領域が設けられた中空 成形用金型において、  [8] A hollow in which a fluid flow path forming region is provided between a position for injecting the pressurized fluid into the mold cavity and a hollow portion forming region for guiding the pressurized fluid from the injection position to form a hollow portion. In molding dies,
流体流路形成領域の金型キヤビティ面に、前記注入位置から前記中空部形成領 域へと伸びる所定領域までの間にシボ模様を形成する処理が施されていることを特 徴とする中空成形用金型 The mold cavity surface of the fluid flow path forming area is subjected to a process of forming a grain pattern from the injection position to a predetermined area extending to the hollow part forming area. Mold for hollow molding
PCT/JP2004/011554 2003-08-22 2004-08-11 Hollow molded product, method of manufacturing hollow molded product, and metal mold for hollow molding WO2005018902A1 (en)

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