WO1993017854A1 - Produit moule composite presentant des proprietes d'amortissement et son procede de fabrication - Google Patents

Produit moule composite presentant des proprietes d'amortissement et son procede de fabrication Download PDF

Info

Publication number
WO1993017854A1
WO1993017854A1 PCT/JP1993/000290 JP9300290W WO9317854A1 WO 1993017854 A1 WO1993017854 A1 WO 1993017854A1 JP 9300290 W JP9300290 W JP 9300290W WO 9317854 A1 WO9317854 A1 WO 9317854A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
rubber
elastic body
same
molded product
Prior art date
Application number
PCT/JP1993/000290
Other languages
English (en)
Japanese (ja)
Inventor
Toshinori Koseki
Kunio Maeda
Syoichi Kanno
Original Assignee
Asahi Kasei Kogyo Kabushiki Kaisha
Toyota Jidosha Kabushiki Kaisha
Kabushiki Kaisha Kobe Seiko Sho
Mitsubishi Petrochemical Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Kasei Kogyo Kabushiki Kaisha, Toyota Jidosha Kabushiki Kaisha, Kabushiki Kaisha Kobe Seiko Sho, Mitsubishi Petrochemical Co., Ltd. filed Critical Asahi Kasei Kogyo Kabushiki Kaisha
Priority to GB9322239A priority Critical patent/GB2273457B/en
Priority to DE4390938T priority patent/DE4390938T1/de
Priority to DE4390938A priority patent/DE4390938C3/de
Priority to KR1019930703369A priority patent/KR0124927B1/ko
Publication of WO1993017854A1 publication Critical patent/WO1993017854A1/fr

Links

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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/1276—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed parts being three dimensional structures which are wholly or partially penetrated by the foam
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0407—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by regulating the temperature of the mould or parts thereof, e.g. cold mould walls inhibiting foaming of an outer layer
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/08—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles using several expanding or moulding steps
    • B29C44/083—Increasing the size of the cavity after a first part has foamed, e.g. substituting one mould part with another
    • B29C44/086—Increasing the size of the cavity after a first part has foamed, e.g. substituting one mould part with another and feeding more material into the enlarged cavity
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements

Definitions

  • the present invention relates to a cushioning composite molded article comprising a hard base material, a cushion material integrally provided on the hard base material and covered with a surface material, and a manufacturing method thereof. It is about methods. More specifically, it has a hard base material to obtain a certain strength, and a cushion material covered with a surface material to obtain an excellent appearance and soft feel. Automotive interior materials (instrument panels, door panels, seating panels, steering wheels, handles, etc.), furniture (chair seats, etc.), The present invention relates to a cushion-type composite molded product used for parts and products such as miscellaneous goods (shoes, slippers, etc.) and a method for producing the same.
  • a hard base material is created by injection molding a lens, AS resin, ABS resin, etc., and the surface material and the hard base material are placed in a mold, and a foamable poly resin is injected and foamed between the two. Let To make cushion material.
  • a laminate of surface material and cushioning material obtained by bonding a semi-rigid vinyl chloride sheet and a cross-linked foamed polypropylene sheet with an adhesive is placed in a mold.
  • the above-mentioned conventional manufacturing methods each include a non-foamed surface material, a cushion material obtained by foaming an expandable rubber-like elastic material, and a hard base material which is a hard resin molded product.
  • a non-foamed surface material a cushion material obtained by foaming an expandable rubber-like elastic material
  • a hard base material which is a hard resin molded product.
  • Japanese Patent Application Laid-Open No. H11-2494916 discloses that a thermoplastic elastomer material containing a foaming agent is inserted into a mold after a resin insert made of polyolefin is inserted into a mold, and a product carrier is provided. A non-foamed skin is charged into the cavity by charging an amount smaller than the capacity of the product (hereinafter referred to as a short shot) and then foaming it in a mold. At the same time, the soft resin-coated portion is adhered or heat-sealed to the insert through the skin. Then, a method for producing a soft resin molded product is described. (Insert short shot method)
  • a strength retainer is preliminarily charged into an injection molding mold having a cavity capable of increasing the volume while holding a molten resin therein. Then, after injecting the foamable polyrefin resin thermoplasticized into the mold cavity, the volume of the cavity is increased to foam the polyrefin.
  • a method for producing a laminated structure having a polyolefin foam layer is described.
  • the polyolefin does not have good rubber-like elasticity like a saturated styrenic rubber-like elastic material, it cannot be used to foam the polyolefin. According to this method, a high-quality cushioning composite molded article having a good feeling with a foot, which is an object of the present invention, cannot be obtained.
  • Japanese Unexamined Patent Publication No. Sho 63-32-27331 discloses that in a soft resin injection molded product comprising a resin insert and a soft resin coating portion, the resin insert is a polyolefin resin. And a soft tree Styrene based resin with a hardness of 10 to 0.50 for hardness (JISK6301: A type) and compression set (JISK630: 70 ° CX22h) It describes a soft resin injection-molded product that is a thermoplastic elastomer and has a soft resin coating portion having a thickness of 0.5 mm or more. (Insert and non-foam molded products)
  • This molded product is molded by a general insert / non-foam injection molding method.
  • the general insert and non-foam injection molding methods it is possible to form a molded product that is thin and accurately transfers the mold surface pattern.
  • the softness that is the object of the present invention provides a good feel. High quality cushioning composite molded products cannot be obtained.
  • An object of the present invention is to form a surface material made of a non-foamed flexible rubber elastic body, a cushion material formed by foaming a rubbery elastic body, and a hard base material of a hard resin molded product. It is an object of the present invention to provide high-quality cushioning-type composite molded products. Another object of the present invention is to provide a method for producing the composite molded article in a small number of steps and at low cost. More specifically, a hard resin molded product molded in advance is mounted as a hard substrate in a mold having a larger gap than the hard resin molded product, and then a foamable rubber-like elastic body is placed in the gap.
  • the inside of the mold is shot and a foamable rubber-like elastic layer is integrally formed on the hard base material. Then, the inside of the mold is enlarged to expand the foam-like rubber-like elastic body.
  • the rigid substrate A surface material having a good appearance and feel similar to, for example, natural leather, and a cushion material covered with the surface material, provided on the hard base material. Cushioning Either make it possible to manufacture composite molded products with a small number of manufacturing steps and low manufacturing costs (insertion and mold cavity enlargement method), or use hard resin in the mold.
  • the inside of the mold is completely filled to obtain a hard resin molded product as a hard base material, and after cooling, the inside of the mold is enlarged.
  • the inside of the mold is further expanded to expand the foam.
  • foaming the rubber-like elastic body layer a hard base material and a surface having a good appearance and feel similar to, for example, natural leather
  • a cushion-type composite molded product comprising a cushion material covered with the same surface material and provided on the hard substrate, with a reduced number of manufacturing steps and The aim is to make it possible to manufacture at low manufacturing cost (two-layer molding and mold cavity enlargement method).
  • a hard base material previously molded into a desired shape is mounted in a mold having a larger gap than the hard base material or a hard base material is injected into a mold having a desired shape by injecting a hard resin. After forming, the inside of the mold is expanded to have voids,
  • foamable rubber-like elastic material is injected into these voids and covered with a surface material as a skin layer that accurately transfers the mold surface pattern onto a hard substrate.
  • Body layer Form
  • the inside of the mold is enlarged to foam the foamable rubber-like elastic material layer to form the cushion material covered with the surface material.
  • the present invention relates to a method for producing a cushioning composite molded article having an excellent appearance and a soft feel, and a cushioning composite molded article produced by the production method.
  • FIG. 1 is an explanatory view showing the procedure for the first embodiment of the manufacturing method of the present invention.
  • FIG. 2 is a cross-sectional view of the cushioning composite molded product according to the present application.
  • FIG. 3 is an explanatory diagram showing a procedure for a second embodiment of the manufacturing method of the present invention.
  • the present invention relates to the above-mentioned production method (insert mold void enlarging method and two-layer molding, mold void enlarging method) and a molded product produced by the production method, wherein a specific rubber-like elastic material is used.
  • a specific rubber-like elastic material is used.
  • the thermoplastic rubber-like elastic body in the present invention constitutes a surface material and a cushion material.
  • a saturated styrene-based rubber-like elastic body is used as this rubber-like elastic body.
  • the average molecular weight based on the GPC method is more than 30,000 and up to 70,000 or less, as a saturated styrene rubber-like elastic material.
  • a saturated styrene rubber-like elastic material having a hardness of more than 50 and less than 100 is preferably used.
  • This saturated styrenic rubber-like elastic material is a saturated styrenic rubber. It may be a len-butadiene rubber-like elastic material or a saturated styrene-soprene rubber-like elastic material.
  • the method of the present invention may break the cell wall at the stage of foaming and form open cells. However, large bubbles are formed, or cracks or cavities are formed inside, so that high-quality cushioning composite moldings cannot be formed.
  • the saturated styrene rubber-like elastic material is covered with a surface material having a good appearance and feel similar to natural leather, for example, if the hardness exceeds 100, based on JISK631. It is not possible to obtain a flexible, high-quality cushioning-type composite molded product made of a cushioned material. Further, the saturated styrene rubber-like elastic material can be foamed well by the method of the present invention even if the A hardness is 50 or less based on JISK631, but the molded cushion is The water-soluble composite molded product has a sticky surface and is remarkably flexible, so that a high-quality cushioning composite molded product cannot be obtained.
  • the saturated type rubber-based elastic body may be used alone, or may be a compound with another rubber-like elastic body, a synthetic resin, a filler or the like.
  • the saturated styrenic rubber-like elastic material is a compound of the above-mentioned specific saturated styrenic rubber-like elastic material and polyolefin.
  • a high quality cushioning composite molded product can be easily molded.
  • the low-density polystyrene is used as a polyrefin which can be used for the compound of the specific saturated styrenic rubber-like elastic material and the polyrefin.
  • Polyolefins such as linear low density polyethylene, high density polyethylene, polypropylene, polybutene, ethylene and other orthoolefins Ethylene copolymers with ethylene monomers, ethylene copolymers with ethylene and other vinyl monomers', propylene and other olefinic copolymers Propylene copolymers with monomers, ethylene ⁇ olefin rubbers such as propylene rubbers.
  • the saturated styrene-based rubber-like elastic body is a combination of the specific saturated styrene-based rubber-like elastic body and a polyrefin. If it is a hand, the hardness of this component and the hand must be in the range of more than 50 and less than 100 in accordance with JIS.K6301. If this is not the case, the method of the present invention provides a flexible, high-quality material consisting of a cushion material covered with a surface material that has a good appearance and feel similar to natural leather, for example. A cushioned composite molded product cannot be obtained.
  • melt viscosity of this compound at the temperature at the time of injection in the method of the present invention is not less than 300 poise and not more than 3 poise at a shear rate of 1,000 oz. It must be within the range of 5, 0 0 poise or more and 5 0, 0 0 poise or less. This If it is outside of the range, the method of the present invention provides a high-quality cushioning made of a cushioning material covered with a surface material having a good appearance and feel similar to, for example, natural leather. Unable to obtain composite molded product.
  • the method of the present invention uses The compound does not form well and does not foam.
  • the most important steps are the surface material and the cladding.
  • the most preferable average molecular weight of the foamable rubber-like elastic material in the step of forming the cushioning material is 40,000 or more and 60,000 or less.
  • a thermoplastic rubber-like elastic material having a relatively large molecular weight and a thermoplastic rubber-like elastic material having a relatively small molecular weight are mixed so that the average molecular weight is not less than 40,000 and not more than 60,000. Is also a preferred method.
  • thermoplastic rubber-like elastic material with a relatively large molecular weight
  • thermoplastic rubber-like elastic material with a relatively small molecular weight
  • the disadvantages of both can be eliminated.
  • the melt viscosity of the thermoplastic rubber-like elastic body at the time of molding increases, so that it becomes difficult to mold a thin large-sized molded product or foam.
  • the strength and heat resistance of the molded product are improved.
  • the optimal average molecular weight of the thermoplastic rubber-like elastic material should be selected within the range of 40,000 or more and 60,000 or less depending on the shape, dimensions and required characteristics of the molded product. Most preferred.
  • the thickness of the surface material and the expansion ratio of the cushion material can be arbitrarily set by appropriately setting the molding conditions, so that the thickness of the surface material is set to be thin.
  • the foaming ratio of the cushioning material is set to a high value
  • the saturated type rubber-based elastic material has a relatively high A-hardness based on JISK 6301.
  • the A-hardness based on JISK 6301 exceeds 100, the formed composite cushioning product is too hard, and the flexible and high-quality cutout of the object of the present invention is obtained. It is not possible to obtain a shocking composite molded product.
  • the saturated S-styrene rubber-like elastic material based on JISK 6301 Even if the hardness is relatively low, it is possible to obtain a flexible, high-quality cushioning composite molded product.
  • a cushion-type composite molded product having an A hardness of 50 or less based on JISK 6301 has a sticky surface, is extremely flexible, High quality cushioning compound for the purpose of It is not a molded product.
  • the injection molding conditions of the foamable rubber-like elastic body include the temperature of the molten rubber-like elastic body in the injection cylinder and the start of injection.
  • Pressure (back pressure) of the molten rubber-like elastic body in the injection cylinder pressure (injection pressure) of the molten rubber-like elastic body in the injection cylinder during injection, mold inner surface temperature, Mold thermal conductivity, time from injection start to injection completion (injection time), time from injection completion to mobile mold retraction start (primary mold opening start) (mould opening start time), mobile mold retraction start It is most important to properly set the time until the retraction is completed (required mold opening time) and the time from the completion of the retraction of the movable mold to the start of mold opening (start of secondary mold opening) (cooling time).
  • the temperature of the molten rubber-like elastic body in the injection cylinder is set in the range of 190 to 270 ° C.
  • Pressure in the molten rubbery elastomer into an injection Shi Li Nda until the start of injection (back pressure) is set in the range of 1 0 kg zone cm 2 ⁇ 5 0 0 kg / cm 2.
  • the gas for foaming generated by decomposition of the chemical foaming agent must be completely dissolved in the molten rubber-like elastic body, and the pressure must be set so that it completely melts. Usually, it is more preferable to set within the range of 20 kg / cm 2 to 100 kg / cm 2 .
  • the pressure (injection pressure) of the molten rubber-like elastic body in the injection cylinder at the time of injection is set within the range of 100 kgZcm 2 to 1,500 kg / cm 2 . Usually 3 0 0 kg cm 2 ⁇ 1 , More preferably, it is set within the range of 0.0 kg / cm 2 .
  • the mold inner surface temperature is set within the range of 0 to 80 ° C. Normally, it is sufficient to set a value in the range of 10 to 30.However, when a rubber-like elastic material with a large molecular weight is used or a rubber-like elastic compound with a high melt viscosity is used In this case, it is preferable to set a relatively high temperature. If the mold inner surface temperature is set to a relatively high temperature, set a longer time from the completion of the injection to the start of the retraction of the movable mold (start of opening the primary mold), or the time from the start of the retraction of the movable mold to the completion of the retraction. It is necessary to set a long time.
  • the material of the mold is not particularly limited, and generally used metals can be preferably used.
  • the surface of the mold is coated with a material with high heat insulation, or a material with low thermal conductivity such as resin mold or ceramic mold is used. Molds can also be used.
  • the surface of the mold is covered with a material with high heat insulation, or when using a mold with a low thermal conductivity such as a resin mold or a ceramic mold, the movable mold recedes from the completion of injection. It is necessary to set a long time until the start (opening of the primary mold) and a long time from the start of the mobile retraction to the completion of the retraction.
  • the mold surface directly in contact with the surface material may be provided so that a leather-like pattern or other patterns can be transferred to the surface material depending on the use of the composite molded article.
  • Time from injection start to injection completion (injection time :) is complete Must be set as short as possible. Normally, it is preferable to set it within 5 seconds, more preferably set it within 1 second, and most preferably set it within 0.5 second. If the time from the start of injection to the end of injection is too long, foaming will start by the end of injection, and it will not be possible to mold good molded products. If the size of the molded product is large, it may be difficult to set it too short, but it must be set as short as possible.
  • injection start time it is very important to set the time (injection start time) from the completion of injection to the start of retraction of the movable mold (start of primary mold opening), and it must be set as short as possible. Usually, it is preferable to set it within 30 seconds, and it is even more preferable to set it within 5 seconds. It is often preferable to set it within one second. By setting this time short, it is possible to reduce the thickness of the surface material, and by setting this time long, it is possible to increase the thickness of the surface material. If the rubber hardness of the rubber-like elastic material is relatively high based on JISK 6301, good quality can be achieved by setting this time relatively short to reduce the thickness of the surface material. Can be molded.
  • the rubber-like elastic material has a relatively low A-hardness based on JISK 6301, set this time to a relatively long time and increase the thickness of the surface material to obtain good quality molding. Products can be molded. If this time is too long, the rubber-like elastic body does not foam, and if it is too short, a good surface material is not formed.
  • the setting of the time from the start of the mobile retraction to the completion of the retraction is very important and needs to be set appropriately. Usually, it is preferable to set it within 30 seconds. By setting this time short, the thickness of the surface material can be reduced, and by setting this time long, the thickness of the surface material can be reduced. Can be made thicker.
  • the rubber-like elastic material has a relatively high A-hardness based on JISK 6301, it is good to set this time relatively short to reduce the thickness of the surface material. High quality molded products can be molded. If the rubber-like elastic body has a relatively low A-hardness based on JISK 6301, good results can be obtained by setting this time relatively long and increasing the thickness of the surface material. High quality molded products can be molded. If the time is too long, the rubber-like elastic body does not foam, and if it is too short, a good surface material is not formed.
  • a longer time (cooling time) from the completion of retraction of the movable mold to the start of mold opening (start of secondary mold opening). Normally, it is preferable to set it to 30 seconds or more. If this time is too short, foaming will continue until after the mold opening starts (secondary mold opening starts), and it may not be possible to mold molded products of good quality.
  • the rubber-like elastic body used in the present invention is foamable and contains a foaming agent.
  • the foaming agent is not particularly limited as long as it is capable of foaming a rubber-like elastic body by injection molding.
  • azo compounds such as azodicarbonamide, N
  • Organic chemical blowing agents such as N'-nitro compounds, such as N'-nitronitropentamethylentramine
  • inorganic chemical blowing such as sodium carbonate and sodium bicarbonate. Agents can be used. It is also a good method to use an organic chemical blowing agent and an inorganic chemical blowing agent together.
  • P, .P ' oxybisbenzenesulfonylsemicarbazide
  • p toluenesulfonylsemicarbazide
  • trihydrazinotriazine Compounds such as barium abdicarboxylate can also be used, but in general, abdicarbonamide amide / sodium bicarbonate is preferred.
  • foaming agents may contain various foaming assistants.
  • the hard resin constituting the insert base material or the hard base material formed by two-layer molding may be a hard thermoplastic resin that can be injection-molded.
  • Polyolefin resins such as polyethylene, polypropylene, etc., polystyrene, acrylonitrile / styrene copolymer resin, acrylonitrile Polystyrene-based resin such as non-butadiene-styrene copolymer resin, modified polyphenylene ether-based resin, Polyamide 6, Polyamide 66, etc.
  • Polyester resins such as amide resin, polyethylene terephthalate resin, polyester terephthalate resin, polyoxymethylene homopolymer, poly Polyoxymethylene copolymers such as oxymethylene copolymer Butter, port re-methylation Methacrylate resin can be used.
  • the hard resin to be used may be one kind of hard resin, but may be a blend of a plurality of kinds of hard resins, or may be made of another synthetic resin, a rubber-like elastic material, a filler, a reinforcing material, or the like. It may be a compound.
  • the hard resin preferably has a small specific gravity in order to reduce the weight of the obtained cushioning composite molded article. From this viewpoint, it is preferable to use a polyolefin resin or a polyolefin resin. Styrene resin is preferred.
  • the rubber-like elastic body constituting the above-mentioned surface material and cushion material and the hard resin constituting the above-mentioned hard base material are recycled together without separating the rubber-like elastic body from the hard resin. It is preferable that the materials are compatible with each other and, if possible, of the same kind so that they can be mixed. However, in general, even if a rubber-like elastic body and a hard resin that are not compatible with each other are used, it is possible to recycle them by using a compatibilizer at the time of recycling. is there.
  • the injection molding equipment used in this insert mold gap enlarging method can be the most common injection molding equipment having one injection machine.
  • the hard resin molded product 1 is mounted in the mold 2.
  • This hard resin molded article 1 constitutes the hard base material 9 of the cushioning composite molded article 5 shown in FIG. 2, and is formed as a hard base material 9 by a molding method using a hard resin. What is necessary is just to be molded into the required shape. Generally, it is an injection molded product, but it may be a compressed air molded product, a vacuum molded product, or the like.
  • the mounting of the hard resin molded article 1 in the mold 2 is performed along the fixed mold 2a or the movable mold 2b, and is performed along the movable mold 2b in the drawing.
  • a foamable rubber-like elastic body 3 is injected into a cavity in the mold 2 on which the hard resin molded article 1 is mounted, to completely fill the cavity of the mold 2. I do. That is, the foamable rubber elastic body 3 is fully shot.
  • the thickness of the cavity inside the mold 2 filled with the foamable rubber-like elastic body 3 is preferably in the range of 0.5 to 4 mm, more preferably in the range of 1 to 3 mm. It is in that. If the thickness is too small, it becomes difficult to foam the foamable rubber elastic body 3. If the thickness is too large, good foaming can be achieved, but the weight of the molded article is unnecessarily heavy and uneconomical, which is not preferable. Further, in order to uniformly foam the foamable rubber-like elastic body 3 as a whole, it is preferable that the thickness of the inside of the mold 2 filled with the foamable rubber-like elastic body 3 is uniform. However, depending on the intended use of the obtained cushioning composite molded article 5 (see Fig. 2), this empty space may be intentionally used. In some cases, it may be desirable to vary the thickness of the gap to intentionally cause uneven foaming.
  • the foamable rubber-like elastic body 3 is shot into the void.
  • the rubber-like elastic body 3 has foaming properties, but foaming is suppressed by the pressure caused by the injection, so that almost no foaming occurs at this stage.
  • the foamable rubber-like elastic body 3 comes into close contact with the inner surface of the mold 2 due to the full shot, and the foamable rubber-like elastic body 3 comes into contact with the inner surface of the mold 2.
  • the surface portion of the body 3 is cooled and hardly foams even in the subsequent stages to form a so-called skin layer 4 (non-foamed surface material). Is the surface material 6 of the cushioning composite molded product 5 shown in FIG. 2, and is formed in a substantially unfoamed state in close contact with the inner surface of the mold 2. Therefore, the surface pattern of the mold is transferred to the mold pattern accurately and has a good surface condition.
  • the foamable rubber-like elastic body 3 foams and expands in volume, so that it closely adheres to the inner surface of the mold 2 and cools the surface.
  • the surface obtained in this way after foaming Since it is a cooled surface, it has a rough surface and has the practical appearance and feel of natural leather, for example, which is the object of the present invention. No surface material is formed.
  • the injection E force is released and the movable mold 2 b is moved when the foamable rubber-like elastic body 3 is in a foamable state. Then, the inside of the mold 2 is enlarged. As shown in (c), the expansion inside the mold 2 is performed without separating the fixed mold 2a and the movable mold 2b and keeping the mold 2 in the unreleased state (core sealed type). However, as shown in (d), the fixed type 2a and the movable type 2b may be separated and the mold 2 may be released (core release type). Also, a movable block is provided in the fixed mold 2a or a part of the movable mold 2b without moving the entire movable mold 2b, and the mold 2 is moved by moving the block. The inside may be partially enlarged.
  • the foamable rubber-like elastic body 3 foams to form a foamed elastic body 7.
  • This foamed elastic body 7 constitutes the cushioning material 8 of the cushioning-type composite molded article 5 shown in FIG.
  • the foamable rubber elastic body 3 is free foamed with its surface away from the mold 2, so that the surface becomes a smooth curved surface and relatively high foaming. This gives a multiple of foam 7.
  • the closed core type (c) by adjusting the amount of movement of the movable mold 2b, foaming can be performed while controlling the thickness of the foamed elastic body 7 obtained.
  • the skin layer 4 (surface material) having a good surface condition is obtained, and the skin layer 4 (c) or (d) to (e) or
  • the inner surface temperature of the mold 2 at the stage (c) or (d) from the stage (b) is determined. It is necessary to set it appropriately.
  • the set temperature of the inner surface of the mold 2 from the step (b) to the step (c) or (d) differs depending on the type of the rubber-like elastic body 3 used. What is necessary is just to set within the range of the temperature which can fully solidify 3, and usually about room temperature is enough. It is also effective to coat the inner surface of the mold 2 with a heat insulating layer made of a material with low thermal conductivity, if necessary, or to configure the entire mold 2 with a material with low thermal conductivity. .
  • the time from the completion of the injection of the foamable rubber-like elastic body 3 into the mold 2 to the start of the retreat of the movable mold 2b is determined by the foaming elasticity at the stage (c) or (d).
  • the type of the rubber-like elastic body 3 the inner surface temperature of the mold 2 (the temperature of the rubber-like elastic body 3), and the like (preferably adjusted accordingly).
  • the movable mold 2b be retracted at an early stage after the injection of the foamable rubber-like elastic body 3 so that it can be maintained at a high level.
  • the movable rubber 2 is injected after the foamable rubber-like elastic body 3 is injected in order to promote the formation of the skin layer 4 having a good surface condition. It is preferred that the mobile 2.b be retracted after a relatively long time before the retraction of b is started.
  • the foamed rubber-like elastic body 3 is foamed into a foamed elastic body 7 having a skin layer 4 and then sufficiently cooled and taken out of the mold 2, as shown in FIG.
  • the cushioning composite molded article 5 in which the cushioning material 8 having the surface material 6 is integrally provided on the hard base material 9 can be obtained.
  • the injection molding apparatus used in the invention of the two-layer molding / mold gap enlarging method is an injection molding apparatus having two or more injection machines, generally called a two-color molding machine or a multicolor molding machine. is there.
  • a hard resin is injected into a mold 2 ′ composed of a fixed mold 2 a ′ and a movable mold 2 b to form a hard resin molded product 1.
  • the molding of the hard resin molded product 1 may be performed until the hard resin injected into the mold 2 ′ is sufficiently cooled, but the cooling is performed so as not to be deformed in the next step (b). You may leave it in the state.
  • the movable mold 2 b is retracted and separated from the fixed mold 2 a ′, and combined with the new fixed mold 2 a, thereby expanding the inside of the mold 2. Then, a gap is formed in the mold 2.
  • the enlargement in the mold 2 can be performed as the enlargement in the mold 2 'shown in (a).
  • a movable block is provided in a part of the fixed mold 2a 'or the movable mold 2b, and the inside of the mold 2' can be partially enlarged by moving the block D. And it is good.
  • the inside of the mold 2 ′ may be enlarged by moving the movable mold 2 b within a range where the mold 2 ′ shown in (a) is not released.
  • This step (b) corresponds to the state shown in Fig. 1 (a), and the subsequent steps (c) to (g) are steps in Figs. 1 (b) to (f). It is similar to the stage described.
  • a hard resin molded product 1 serving as a hard base material 9 is separately formed in advance, and a surface material 6 and a cushion material 8 are formed and a cup material is formed.
  • the molding material 8 and the hard base material 9 are integrated by one mold 2.
  • the two-layer molding and mold void enlarging method use a hard substrate 9 It is possible to remove the hard resin molded product 1 from the mold 2 ′ without removing it from the mold 2 ′. And it is easy to improve the joining state of both. Further, for the same reason, when the foamable rubber-like elastic body 3 is injected, the thickness of the skin layer 4 formed at a position in contact with the hard resin molded product 1 can be made extremely thin. .
  • SB 1 Average molecular weight based on GPC method 50, 000, A hardness based on JISK 631, 67, styrene content 20% by weight of saturated styrene-butadiene rubber-like rubber
  • SB2 Saturated styrene-butadiene system with average molecular weight of 40,000 based on GPC method, A hardness of 84 based on JISK631, styrene content of 30% by weight Rubber-like elastic body
  • Foaming agent BA 1 Abuji force Norebon amide foaming agent
  • Granular hard resin is charged into the resin supply port of the first injection machine of the molding machine, and a mixture of the granular rubber elastic body and the powdery foaming agent is charged into the resin supply port of the second injection machine. throw into.
  • the hard resin is injected into a mold having a cavity corresponding to the hard resin molded product, and the hard resin molded product is formed.
  • the movable mold of the mold When the hard resin molded product is removed and cooled to the point where it can be taken out, the movable mold of the mold is retracted, and the movable mold is rotated and connected to the fixed mold of the second injection machine to form the foam. A void is formed to eject the rubber-like elastic material. Then, the foamable rubber-like elastic body is injected into the space in the mold using the second injection machine.
  • the movable mold When the surface layer of the injected foamable rubber-like elastic body is solidified and the inside is in a molten state and can be foamed, the movable mold is retracted to foam the inside of the rubber-like elastic body.
  • the expansion inside the mold due to the retreat of the movable mold is performed by the core release type in Example 1, Comparative Example 1, Example 2, and Comparative Example 2, and the core density in Example 3 is used. It is closed.
  • the foamed elastic body formed by foaming the foamable rubber-like elastic body is sufficiently cooled, the molded cushioning composite molded article is removed from the mold.
  • the expansion inside the mold due to the retraction of the movable mold was of the core release type, and molding was performed by changing the type of hard resin, the type of rubber-like elastic body, and the type of foaming agent.
  • the injection of foamable rubber-like elastic material was all shot. The conditions and results are shown in Table 1. Even if the type of the hard resin was changed, a cushion-like composite molded article having excellent appearance and appropriate cushioning properties could be formed.
  • the molding state changes depending on the type of the rubber-like elastic body, and the cushioning property of the obtained cushioning composite elastic body particularly depends on the hardness of the rubber-like elastic body. changed.
  • Table 1 shows the conditions and results of molding a composite composite article with the injection of a foamable rubber-like elastic body as a short shot.
  • the expansion inside the mold due to the retraction of the movable mold was a core release type, and molding was performed by changing the amount of foaming agent added. In addition, all injections of foamable rubber-like elastic material were made full shot. Table 2 shows the conditions and results.
  • the cushioning properties of the obtained cushion-like composite molded article changed depending on the amount of the foaming agent added.
  • the expansion inside the mold due to the retraction of the movable mold is a core release type, and molding is performed by changing the mold temperature and the time from the completion of injection of the rubbery elastic body to the start of retraction of the movable mold (mold opening start time). I went. All injections of the foaming rubber-like elastic material were shot. Table 2 shows the conditions and results.
  • Molding was carried out with the mold opening start time changed significantly.
  • the inside of the mold due to the retraction of the movable mold is a core-sealed type, and molding is performed by changing the type of foaming agent, the thickness of the foamable rubber-like elastic material filling portion, and the type of rubber-like elastic material. went. In addition, all injection of foamable rubber-like elastic material was made full shot. conditions Table 3 shows the results.
  • the evaluation of the physical properties of the molded article is based on the following criteria.
  • Foaming condition good: A non-foamed surface material with a constant thickness is formed uniformly on the surface of the molded product, and a cushion material with a number of fine closed cells is evenly formed inside.
  • Bad Foamed state of molded product different from above.
  • the mold surface pattern is accurately transferred to the molded product surface.
  • Good feel a surface material composed of smooth natural leather of adult beef that has been chromed and a cushion material composed of soft closed-cell foam made of polyurethane. A good and similar feel when touching a cushioning composite molded product consisting of a hard base made of a hard resin.
  • the present invention is as described above, and has the following effects.
  • the molding of the surface material, the molding of the cushion material, and the integration of the cushion material and the hard base material are performed in one. It is possible to reduce the labor and production cost in the manufacture of cushioning composite molded products, and in the second aspect, In addition, since the hard base can be continuously molded with the same mold, it is possible to further reduce the labor and production cost more than in the first embodiment. .
  • the cushioning composite molded article obtained by this method gives an excellent appearance and a soft touch, and is therefore extremely useful as various interior materials.

Landscapes

  • Injection Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Produit moulé composite présentant des propriétés d'amortissements dans lequel un matériau amortisseur doté d'un matériau de surface est intégré à un matériau dur de base; et procédé de fabrication du produit moulé composite selon un processus simplifié comprenant moins d'étapes de fabrication. On met en place dans un moule métallique un produit moulé en résine dure, on injecte un corps élastique caoutchouteux et expansible, et on fait se dilater le moule métallique de manière à procéder à l'expansion du corps élastique caoutchouteux. Ainsi, ledit corps élastique caoutchouteux et sa couche de peau constituent respectivement un matériau amortisseur et un matériau de surface. En outre, la formation de ces matériaux et leur intégration au matériau dur de base en tant que produit moulé en résine dure, peuvent s'effectuer successivement dans un même moule métallique. De ce fait, la fabrication est simplifiée et les coûts de main d'÷uvre et de fabrication sont réduits.
PCT/JP1993/000290 1992-03-10 1993-03-10 Produit moule composite presentant des proprietes d'amortissement et son procede de fabrication WO1993017854A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB9322239A GB2273457B (en) 1992-03-10 1993-03-10 Process for production of a cushioning composite molded article
DE4390938T DE4390938T1 (de) 1992-03-10 1993-03-10 Geformter Verbundpolstergegenstand und Verfahren zu seiner Herstellung
DE4390938A DE4390938C3 (de) 1992-03-10 1993-03-10 Verfahren zur Herstellung eines geformten Verbundpolster-Gegenstandes
KR1019930703369A KR0124927B1 (ko) 1992-03-10 1993-03-10 완충성 복합 성형품 및 그의 제조방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8609292 1992-03-10
JP4/86092 1992-03-10

Publications (1)

Publication Number Publication Date
WO1993017854A1 true WO1993017854A1 (fr) 1993-09-16

Family

ID=13877071

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1993/000290 WO1993017854A1 (fr) 1992-03-10 1993-03-10 Produit moule composite presentant des proprietes d'amortissement et son procede de fabrication

Country Status (6)

Country Link
KR (1) KR0124927B1 (fr)
CA (1) CA2102608C (fr)
DE (2) DE4390938C3 (fr)
GB (1) GB2273457B (fr)
TW (1) TW252074B (fr)
WO (1) WO1993017854A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995016552A1 (fr) * 1993-12-15 1995-06-22 Möller Werke GmbH Procede de fabrication de pieces en plastique moulees pourvues d'une couche superficielle de materiau decoratif

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4417952A1 (de) * 1994-05-21 1995-11-23 Petri Ag Abdeckung für Gassack-Aufprall-Schutzeinrichtungen sowie Verfahren zu ihrer Herstellung
DE10014156A1 (de) * 2000-03-22 2001-10-11 Daimler Chrysler Ag Verfahren zur Herstellung eines geschäumten Kunststoffteils
US20060082109A1 (en) * 2004-10-20 2006-04-20 Hier Michael J Method of making an automotive trim assembly having an integrated airbag door
DE102008017508A1 (de) * 2008-04-04 2009-10-08 Otto Bock Schaumsysteme Gmbh Verfahren zur Herstellung eines Formteils
KR101358824B1 (ko) * 2012-03-21 2014-02-11 주식회사 한국 오.지.케이 열성형 접착방식을 이용한 운전자용 기능성 보호장구
KR20220153385A (ko) 2021-05-11 2022-11-18 경희대학교 산학협력단 에너지 하베스팅을 이용한 족압 실시간 측정장치, 그 장치를 갖는 휴대용 웨어러블 무전원 모니터링 시스템 및 방법

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4910967A (fr) * 1972-05-31 1974-01-30
JPS6377719A (ja) * 1986-09-19 1988-04-07 Shigeru Kogyo Kk 積層製品の射出成形方法
JPH01249416A (ja) * 1988-03-31 1989-10-04 Toyoda Gosei Co Ltd 軟質樹脂成形品及びその製造方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1282294B (de) * 1965-05-17 1968-11-07 Desma Werke Gmbh Verfahren zur Herstellung von Fussbettsohlen aus blaehbarem Werkstoff und Spritzgiessform zur Durchfuehrung des Verfahrens
GB1510300A (en) * 1974-04-01 1978-05-10 Ici Ltd Injection moulding
DE2416694A1 (de) * 1974-04-05 1975-10-23 Schloemann Siemag Ag Vorrichtung zur herstellung von formteilen aus kunststoff
KR900004544B1 (ko) * 1986-09-19 1990-06-29 도요다 고세이 가부시끼 가이샤 연질수지 사출 성형품

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4910967A (fr) * 1972-05-31 1974-01-30
JPS6377719A (ja) * 1986-09-19 1988-04-07 Shigeru Kogyo Kk 積層製品の射出成形方法
JPH01249416A (ja) * 1988-03-31 1989-10-04 Toyoda Gosei Co Ltd 軟質樹脂成形品及びその製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995016552A1 (fr) * 1993-12-15 1995-06-22 Möller Werke GmbH Procede de fabrication de pieces en plastique moulees pourvues d'une couche superficielle de materiau decoratif
US6146564A (en) * 1993-12-15 2000-11-14 Moller Plast Gmbh Process for the production of plastic molded parts with decorative lamination

Also Published As

Publication number Publication date
CA2102608C (fr) 1997-03-25
TW252074B (fr) 1995-07-21
KR0124927B1 (ko) 1997-12-01
GB9322239D0 (en) 1994-03-09
DE4390938C3 (de) 1999-02-11
GB2273457A (en) 1994-06-22
DE4390938C2 (de) 1996-03-21
CA2102608A1 (fr) 1993-09-11
GB2273457B (en) 1996-03-27
DE4390938T1 (de) 1994-05-05

Similar Documents

Publication Publication Date Title
US5702810A (en) Cushioning composite molded article and a process for production thereof
JP3814032B2 (ja) 成形品
JP3317882B2 (ja) ３層構造を有する成形体の製造方法
JP4572443B2 (ja) 熱可塑性樹脂自動車内装用発泡成形体
WO2009142819A2 (fr) Articles thermoplastiques moulés
WO1993017854A1 (fr) Produit moule composite presentant des proprietes d'amortissement et son procede de fabrication
JP3023741B2 (ja) クッション性複合成形品及び製造方法
JP4696366B2 (ja) 熱可塑性樹脂発泡成形体
JP2001334549A (ja) 複合成形品の製造方法および複合成形品
JPH08300392A (ja) 発泡性プラスチック組成物の射出成形方法
JP2001088161A (ja) 薄肉軽量樹脂成形品の製造方法および薄肉軽量樹脂成形品
JP4797570B2 (ja) ポリプロピレン系樹脂製射出成形体の製造方法
JP4909153B2 (ja) 熱可塑性樹脂発泡成形体の製造方法
JP2002011755A (ja) 発泡成形体の製造方法
JPH08300391A (ja) 発泡性プラスチック組成物の射出成形方法
JP5072170B2 (ja) ３層構造体の製造方法
JP2000094469A (ja) 繊維含有軽量樹脂成形品の成形方法および成形品
JP3340186B2 (ja) 積層成形体の製造方法
JP3375377B2 (ja) 繊維強化熱可塑性樹脂発泡成形体の製造方法
KR100554596B1 (ko) 중합체의 성형 방법
EP1013390A1 (fr) Procede de moulage par injection d'une composition plastique expansible
JP4303844B2 (ja) 繊維含有軽量樹脂トレイの製造方法
JP2006159531A (ja) 熱可塑性樹脂発泡成形体の製造方法
JP4311822B2 (ja) 中空射出成形方法および成形金型
JP2002337186A (ja) 射出成形機または押出機の材料供給方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA DE GB KR US

WWE Wipo information: entry into national phase

Ref document number: 9322239.6

Country of ref document: GB

WWE Wipo information: entry into national phase

Ref document number: 2102608

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: 1019930703369

Country of ref document: KR

ENP Entry into the national phase

Ref document number: 1993 150146

Country of ref document: US

Date of ref document: 19931110

Kind code of ref document: A

RET De translation (de og part 6b)

Ref document number: 4390938

Country of ref document: DE

Date of ref document: 19940505

WWE Wipo information: entry into national phase

Ref document number: 4390938

Country of ref document: DE

ENP Entry into the national phase

Ref document number: 1995 508243

Country of ref document: US

Date of ref document: 19950727

Kind code of ref document: A