JP2007083898A - Automobile interior component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automobile interior component adopting a laminating structure to at least a part thereof, reducing the weight of products, and keeping inexpensive price and good appearance. <P>SOLUTION: A door trim 10 is composed of the laminating structure (a trim upper) 20 wherein a resin rib 22 is integrated on a back surface of a foam resin base material 21 having light weight and shape retention and decorating material 23 is pasted to a front surface, and a resin single article (a door trim lower) 30. The decorating material 23 composed of a laminated body of a top layer 23a and base cloth 23b is laminated on a front surface side of the foam resin sheet S which is the material of the foam resin base material 21. By the base cloth 23b, the foam resin sheet S and the decorating material 23 are finely joined. Therefore, weight and cost can be reduced by, for example, enabling thinning of the top layer 23a. Poor molding can be avoided by heat insulating action of the base cloth 23b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to automotive interior parts such as door trims, rear parcel shelves, floor trims, luggage trims, trunk trims, rear side trims, pillar garnishes, roof trims, and the like. Related to automotive interior parts.

  For example, the configuration of automobile interior parts will be described with reference to FIGS. 11 and 12 exemplifying a door trim. The door trim 1 has shape retention and attachment rigidity to a vehicle body panel, and is configured by laminating and integrating a skin 3 excellent in surface appearance on the surface of a resin core material 2 extending over almost the entire product surface. . Reference numeral 2a denotes an inner seal mounting flange for mounting the inner seal. The resin core material 2 is made of polypropylene resin mixed with talc, and the skin 3 itself does not have shape retention, such as a vinyl chloride sheet, a thermoplastic olefin (hereinafter referred to as TPO) sheet, or the like. The synthetic resin sheet is usually used.

  Next, a conventional example of the method for forming the door trim 1 will be described with reference to FIG. First, a molding die 4 that molds the door trim 1 is connected to a molding upper die 5 that can move up and down by a predetermined stroke, a molding lower die 6 that forms a pair with the molding upper die 5, and a molding lower die 6. It is generally composed of the injection machine 7. Then, when the upper and lower molds 5 and 6 are clamped, a cavity part 5a is formed in the upper mold 5 and a core part 6a is provided in the lower mold 6 in order to form the product shape of the door trim 1. Yes. In order to move the molding upper die 5 up and down by a predetermined stroke, an elevating cylinder 5b is connected, and the molding lower die 6 is provided with a manifold 6b and a gate 6c that serve as a passage of molten resin from the injection machine 7. Further, in order to maintain an appropriate posture, the molding upper die 5 that moves up and down is provided with guide posts 6d at four corners of the molding lower die 6, and the molding upper die 5 corresponds to the guide posts 6d. A bush 5c is provided.

  Therefore, when the molding upper and lower molds 5 and 6 are in the mold open state, the skin 3 is set in the mold, and then the molding upper and lower molds 5 and 6 are clamped and then injected into the product cavity between both molds. By injecting and filling the molten resin M from the machine 7 through the manifold 6b and the gate 6c, the resin core material 2 is formed into a required curved shape, and the skin 3 is integrally formed on the surface of the resin core material 2 (for example, , See Patent Document 1). In FIG. 13, for convenience of explanation, the molten resin M is supplied to the mold surface of the core portion 6 a in an open state, but the molten resin M is injected and filled into the cavity after the mold upper and lower molds 5 and 6 are clamped. May be.

Japanese Patent Laid-Open No. 10-138268 (Page 2, FIGS. 3 and 4)

  However, in the conventional door trim 1, since the projected area of the resin core material 2 is large, there are problems that the material cost is high and the product is heavy. In addition, since the projected area of the resin core material 2 is large, it is necessary to set the injection pressure at the time of molding high, and a mold structure that can withstand the high injection pressure is required. In addition, since a large amount of molten resin is cooled and solidified, the molding cycle becomes longer, which is a major factor for reducing productivity.

  The present invention has been made in view of such circumstances, and can be used to manufacture interior parts for automobiles that can promote weight reduction and contribute to cost reduction, and in particular, enhance the appearance and feel of the product surface. An object of the present invention is to provide automobile interior parts that can be used.

  As a result of earnest research, the present inventors have given the function as a core material by imparting shape retention to the foamed resin sheet that has been used conventionally as the skin, and more. In places where rigidity is required, that is, peripheral parts and panels of products, parts mounting places and parts where loads are applied, resin ribs with excellent rigidity are arranged, and other parts are made into a hollow shape, Compared to conventional resin cores with a large projected area, it provides interior trim parts that are lighter and less expensive, and are especially inexpensive for decorative materials that are affixed to the surface side of foamed resin sheets and have improved exterior performance The present invention has been completed by adopting.

  That is, the present invention includes a foamed resin base material that is molded into a required shape, is lightweight and has shape retention, a resin rib having a predetermined pattern shape integrated with the back surface of the foamed resin base material, and the foamed resin base material. In an interior part for an automobile, in which a laminated structure composed of a decorative material affixed to the surface of the material is used in whole or in part, the decorative material in the laminated structure is a base fabric on the back surface of the top layer Is molded, the decorative material is laminated integrally by the residual heat of the foamed resin sheet when the foamed resin sheet that is the material of the foamed resin base material is extruded, and the foamed resin sheet laminated with the decorative material is heat-softened and then molded The foamed resin base material is molded into the required shape by putting it in the mold and clamping the molding die, and the molten resin is injected and filled into the groove of the molded lower mold, so that the resin rib of the required shape Is foam resin base Wherein the of being integrated into the back surface.

  Here, as an interior part for an automobile, as long as it has a structure including at least a part of a laminated structure, for example, a door trim, a rear parcel shelf, a floor trim, a luggage trim, a trunk trim, a rear side trim, Applicable to pillar garnish, roof trim, etc.

  Furthermore, the laminated structure is molded into a desired curved shape, is lightweight and has a shape-retaining foamed resin base material, and a resin rib having a predetermined pattern shape laminated and integrated on the back surface of the foamed resin base material. The foamed resin base material is formed into a required curved shape in the molding die after heat-softening the foamed resin sheet. The shape is retained by molding. The term “shape retention” as used herein refers to having sufficient rigidity to retain the shape at least when the mold is removed after molding, even without a reinforcing material such as a rib.

  As the foamed resin sheet, a material obtained by adding a foaming agent to a thermoplastic resin is used. The thermoplastic resin may be one type of thermoplastic resin or two or more types of thermoplastic resins. Preferably, polyethylene resin, polypropylene resin, polystyrene resin, polyethylene terephthalate resin, polyvinyl alcohol resin, vinyl chloride resin, polyamide resin, polyacetal resin, polycarbonate resin, ionomer resin, acrylonitrile / butadiene / Styrene (ABS) resin or the like can be used. As the foaming agent, an azo compound such as azodicarbonamide, an organic foaming agent such as a sulfohydrazide compound, a nitroso compound or an azide compound, or an inorganic foaming agent such as sodium bicarbonate can be used. The foamed resin base material obtained by molding the foamed resin sheet into a required shape after heat softening treatment preferably has a foaming ratio of 2 to 10 times in consideration of the balance between the weight and strength of the product. The cell diameter of the foamed resin base material at that time is preferably in the range of 0.1 μm to 2.0 mm, and the thickness is 0.5 to 30 mm, preferably 1 to 10 mm.

  On the other hand, the thermoplastic resin material used as the resin rib can be appropriately selected from a wide range of thermoplastic resins. Usually, those that can be preferably used include polyethylene resins, polypropylene resins, polystyrene resins, polyethylene terephthalate resins, polyvinyl alcohol resins, vinyl chloride resins, polyamide resins, polyacetal resins, polycarbonate resins, ionomer resins, Examples include acrylonitrile / butadiene / styrene (ABS) resin. Moreover, you may mix various fillers in these thermoplastic resins. Examples of the filler that can be used include inorganic fibers such as glass fiber and carbon fiber, and inorganic particles such as talc, clay, silica, and calcium carbonate. Moreover, various additives, such as antioxidant, a ultraviolet absorber, a coloring agent, a flame retardant, and a low shrinkage agent, may be mix | blended.

  Next, in order to improve the appearance design, a decorating material is integrated on the surface of the foamed resin base material. As this decorating material, it is comprised from the top layer and the base fabric lined on the back surface. As the top layer, thermoplastic elastomer resin such as TPO, PVC resin, synthetic leather (thermoplastic urethane (hereinafter referred to as TPU) resin), cloth, and nonwoven fabric can be applied. As the top layer, a solid TPO resin or the like is preferable in terms of surface feel, diaphragm transfer property, and the like. As the base fabric, a nonwoven fabric, a knitted fabric, or the like can be used.

  As a usage form of the decorating material, it is preferable to integrate the decorating material by the residual heat of the foamed resin sheet when extruding the foamed resin sheet that is preliminarily heat laminated to the foamed resin sheet. That is, the top layer and the base fabric are integrated in advance by a heat laminating method, and then, when extruding the foamed resin sheet from the extruder, the decorating material is crimped and integrated with a roll using the residual heat of the foamed resin sheet. Can do.

  Here, a molding die for molding the foamed resin base material into a required shape and integrating the resin rib on the back surface of the foamed resin base material is attached to the pair of split molds and the one side mold. It consists of an injection machine. For example, it is comprised from the shaping | molding upper die which can be moved up and down, the shaping | molding lower die which is a fixed side located in the downward side of a shaping | molding upper die, and the injection machine connected with a shaping | molding lower die. When the molded upper and lower molds are used, the molten resin supplied from the injection machine passes through resin passages such as a manifold and a gate provided in the molded lower mold, that is, on the mold surface of the molded lower mold, that is, the mold surface of the molded lower mold The groove portion (corresponding to the resin rib shape) drilled in is injected and filled.

In addition, the foamed resin sheet, which is the material of the foamed resin base material, is laminated with a decorating material, and then heat-softened to 160-220 ° C. by a heater device, and this heat-softened foam when the mold is opened A resin sheet (with a decorating material) is put into a molding die and press-molded into a product shape by clamping the molding die. Pressing pressure of the mold at this time is 0~40kgf / cm ^2, compared to the pressing pressure 80 ± 20kgf / cm ² according to the conventional press molding, can be set low press pressure.

  And according to the interior parts for automobiles concerning the present invention, as a structure of a laminated structure, a lightweight foamed resin base material, a hollow resin rib disposed on the back side thereof, and a foamed resin base material surface Since it is comprised from the decorating material affixed on, weight reduction can be achieved by abolishing the conventional heavy resin core material.

  Furthermore, a decorative material is laminated on the front surface side of the foamed resin sheet, and since this base material is lined with the base fabric on the back surface of the top layer, the base fabric is It effectively functions as an adhesive medium between the resin and the foamed resin base material, and when the resin rib is molded, the heat resistance of the base fabric prevents thermal damage to the top layer. Can secure a good surface texture and suppress thermal damage during molding of resin ribs, which can reduce the number of gates and ease restrictions on the setting position of the gate. .

  As described above, according to the automotive interior part of the present invention, the foamed resin base material that is lightweight and has shape retention, the resin rib laminated and integrated on the back surface of the foamed resin base material, and the foamed resin The whole or at least part of the laminated structure composed of the decorative material affixed to the surface of the base material makes it possible to eliminate the conventional heavy resin core material. It has the effect that it can provide interior parts for automobiles at low cost.

  Furthermore, the interior parts for automobiles according to the present invention are laminated as a part or whole of the laminated structure, and a decorative material is laminated on the surface side of the foamed resin sheet that is the material of the foamed resin base material. This decorative material has a low-cost structure with a base fabric lined on the back surface of the top layer, and since this base fabric functions effectively as an adhesive medium and has a heat insulating function, the appearance design of the top layer Can be maintained well. In addition, it is possible to prevent the decorative material from being peeled off. In addition, it is possible to reduce mold costs such as reduction in the number of gates and relaxation of restrictions on the gate setting position, and the degree of freedom in processing the mold can be increased. It has various effects.

  Hereinafter, a preferred embodiment of an automotive interior part according to the present invention will be described below by illustrating an automotive door trim. Note that the gist of the present invention is as described in the scope of claims, and the contents of the embodiments described below are merely examples of the present invention.

  1 to 10 show an embodiment of the present invention, FIG. 1 is a front view showing a two-tone type automobile door trim, FIG. 2 is a sectional view showing the configuration of the automobile door trim, and FIG. 4 is a front view showing a resin rib and a door trim lower of the door trim upper in FIG. 4, FIG. 4 is a sectional view showing the structure of the door trim upper in the door trim for the automobile, FIG. 5 is an explanatory view showing an outline of the manufacturing method of the door trim for the automobile, FIG. FIG. 7 is an explanatory view showing a decorative material used for a door trim upper in the automotive door trim, FIG. 7 is an explanatory view showing a laminating process of a foamed resin sheet and a decorative material used for the door trim upper in the automotive door trim, FIG. Thru | or FIG. 10 is explanatory drawing which shows each process of the manufacturing method of the door trim for motor vehicles.

  1 and 2, a two-tone type automobile door trim 10 is composed of an upper and lower divided body of a door trim upper 20 made of a laminated structure and a door trim lower 30 made of a single resin product. As functional components to be mounted on the door trim 10, an inside handle escutcheon 11 and a power window switch escutcheon 12 are attached to the door trim upper 20. On the other hand, the door trim lower 30 is provided with a door pocket opening 13, and a pocket back cover (made of a resin molded body) 14 is attached to the rear side of the door trim lower 30, as shown in FIG. The speaker grill 15 is formed integrally with or separately from the door trim lower 30 on the front side.

  By the way, the door trim 10 for automobiles according to the present invention is characterized in that the door trim upper 20 which is a laminated structure is reduced in weight, and the appearance performance and touch feeling of the door trim upper 20 are improved. That is, as shown in FIG. 2, the door trim upper 20 is molded into a desired curved surface shape and has a foamed resin base material 21 having shape retention, and a reinforcement integrated and laminated on the back surface side of the foamed resin base material 21. The resin rib 22 having a function and a decorating material 23 having a decorating function laminated and integrated on the surface side of the foamed resin base material 21 are roughly constituted. In the figure, reference numeral 16 denotes a vehicle body panel. In addition, the foamed resin base material 21 is heat-softened to heat the foamed resin sheet so as to have shape retention, and then thermoformed into a required shape, for example, cold press-molded with a molding die having a desired mold surface. In addition, the foamed resin base material 21 may be shaped by vacuum forming for a portion with a higher development rate.

  The foamed resin sheet has a structure in which a foaming agent is added to a general-purpose thermoplastic resin. The thermoplastic resin includes a polyethylene resin, a polypropylene resin, a polystyrene resin, a polyethylene terephthalate resin, a polyvinyl alcohol resin, a chloride resin. Vinyl resins, polyamide resins, polyacetal resins, polycarbonate resins, ionomer resins, acrylonitrile / butadiene / styrene (ABS) resins, etc. can be used. As blowing agents, azo compounds such as azodicarbonamide, sulfohydrazide compounds Organic foaming agents such as nitroso compounds and azide compounds and inorganic foaming agents such as sodium bicarbonate can be used. In this embodiment, a foamed resin sheet in which sodium bicarbonate is appropriately added as a foaming agent to a polypropylene resin is used. The expansion ratio of the foamed resin substrate 21 is set to 2 to 10 times, and the thickness is set to 0.5 to 30 mm, particularly 1 to 10 mm.

  Next, the resin ribs 22 are disposed on the back surface side of the foamed resin base material 21 and, in particular, as shown in FIG. 3, are set in a predetermined pattern extending in an intersecting manner, and a portion to which a load is applied (for example, a clip seat). The portion excluding the upper surface of the waist portion, the upper surface of the armrest portion, etc.) has a thinned shape. In addition, as for this pattern, arbitrary patterns may be selected as long as it is intersecting, such as a vertical and horizontal direction, an oblique direction, or a combination thereof. The resin rib 22 is made of a general-purpose synthetic resin molded body, and as a synthetic resin that can be preferably used normally, a polyethylene resin, a polypropylene resin, a polystyrene resin, a polyethylene terephthalate resin, a polyvinyl alcohol resin, a vinyl chloride resin, A polyamide resin, a polyacetal resin, a polycarbonate resin, an ionomer resin, an acrylonitrile / butadiene / styrene (ABS) resin, or the like may be selected as appropriate. In this embodiment, a polypropylene resin is used in consideration of environmental and recycling aspects. Is used. The resin rib 22 is appropriately mixed with a filler such as inorganic fibers such as glass fiber and carbon fiber, and inorganic particles such as talc, clay, silica and calcium carbonate in the thermoplastic resin. May be.

  As described above, the door trim 10 shown in FIGS. 1 to 3 includes the door trim upper 20 formed of a laminated structure and the door trim lower 30 of a single resin, and has an excellent appearance design due to an accent effect on the appearance. I have. Further, the door trim upper 20 includes a foamed resin base material 21 having shape retention, a resin rib 22 laminated and integrated on the back surface of the foamed resin base material 21, and a decorating material 23 having a decorating property. Therefore, the resin core material occupied over the entire surface of the product can be abolished as before, and the weight of the product can be reduced compared to the conventional example because the lightweight foamed resin base material 21 is used. In addition to saving the resin material, it can contribute to cost reduction. Furthermore, since the foamed resin base material 21 has a porous structure, the door trim upper 20 is excellent in sound absorption performance and can reduce noise in the vehicle interior.

Moreover, the decorating material 23 affixed on the surface of the foamed resin base material 21 is comprised in the present Example from the two-layer structure of the top layer 23a and the base fabric 23b backed on the back surface. Specifically, a solid TPO resin is used as the top layer 23a, and a polyester nonwoven fabric (weight per unit area: 10 to 100 g / m ² ) is used as the base fabric 23b. In addition to the non-woven fabric, a fabric such as a woven fabric or a knitted fabric (for example, a knitted fabric) (weight per unit area: 50 to 100 / m ² ) may be used as the base fabric 23b. In addition to the TPO resin described above, a thermoplastic resin sheet such as PVC resin or TPU resin, a woven fabric, a non-woven fabric, or the like can be used as the top layer 23a.

  Next, an outline of a method for manufacturing the door trim 10 will be described with reference to FIG. A molding die 40 used for molding the door trim 10 is connected to a molding upper mold 41 that can move up and down by a predetermined stroke, a molding lower mold 42 that is paired with the molding upper mold 41, and a molding lower mold 42. It is mainly composed of two injection machines 43a and 43b. More specifically, the molding upper die 41 has a cavity portion 411 that matches the product shape, and is driven up and down by a predetermined stroke by an elevating cylinder 412 connected to the upper surface of the molding upper die 41. In addition, guide bushes 413 serving as a guide mechanism are provided at the four corners of the molding upper die 41.

  On the other hand, the molding lower die 42 is provided with a core portion 421 corresponding to the cavity portion 411 of the molding upper die 41. Further, in order to supply molten resin to the mold surface of the core portion 421, manifolds 422a and 422b and gates 423a and 423b are provided in the molding lower mold 42. Resins of the manifolds 422a and 422b and gates 423a and 423b are provided. The molten resins M1 and M2 supplied from the injection machines 43a and 43b through the passages are supplied into the groove 424 formed on the upper surface of the core 421 and into the cavity 425 for forming the door trim lower 30. In addition, guide posts 426 serving as a guide mechanism protrude from the four corners of the molding lower die 42. The guide posts 426 are guided in the guide bush 413 so that the molding upper die 41 is clamped during clamping. The press posture can be maintained properly.

  When the molding upper mold 41 and the molding lower mold 42 are in the mold open state, the foamed resin sheet S and the decorating material 23 are put into the mold. . The raw material A is heated and softened to 160 to 220 ° C. by the heater device 50 and then put into the molding die 40. Here, based on FIG. 6, FIG. 7, the formation process of the decorating material 23 and the lamination process of the foamed resin sheet S and the decorating material 23 are each demonstrated. First, in FIG. 6, the top layer 23 a and the base fabric 23 b are supplied from the raw fabric rolls 60 and 61, and are heat-softened by the frame 62 and are subjected to a pressure-bonding process by the pressure-bonding roll 63, thereby decorating the material 23. Form. Next, as shown in FIG. 7, the foamed resin sheet S is extruded from the extruder 70, and the base fabric 23 b of the decorating material 23 supplied from the raw fabric roll 71 of the decorating material 23 is heated by the residual heat of the foamed resin sheet S. The material A is formed by subjecting the material to softening and pressure bonding with the pressure-bonding roll 72 and laminating the decorative material 23 on the surface side of the foamed resin sheet S.

  Next, based on FIG. 8 to FIG. 10, each step in which the method of the present invention is applied to a method for manufacturing a two-tone type automobile door trim 10 will be described. First, as shown in FIG. 8, the raw material A is heated and softened by a heater device 50 such as an infrared heater and put into a molding die 40 in a mold open state. As described above, in the raw material A, the decorating material 23 is laminated on one surface of the foamed resin sheet S. As the foamed resin sheet S, a polypropylene foam sheet (manufactured by Sumika Plustech, trade name: Sumiceller foam PP sheet, expansion ratio = 3 times, thickness 3 mm) is used. The raw material A is set in the upper half of the cavity defined by the cavity portion 411 of the molding upper die 41 and the core portion 421 of the molding lower die 42 at the location corresponding to the door trim upper 20.

Then, after the raw material A is set, the elevating cylinder 412 of the molding upper die 41 is operated, the molding upper die 41 is lowered by a predetermined stroke, and the molding upper and lower dies 41 and 42 are clamped as shown in FIG. Then, the foamed resin sheet S is shaped along a desired mold surface shape, the foamed resin base material 21 is molded into a required shape, and the decorating material 23 is integrated on the upper surface of the foamed resin base material 21. The At this time, a pressing pressure of molding upper and lower dies 41, 42 is carried out molding at low pressure press 0~40kgf / cm ^2, half the press pressure than the pressing pressure 80 ± 20kgf / cm ² conventional press molding And the load on molding can be reduced.

  Furthermore, since the pressure is low during press molding, when a squeezed resin sheet is used as the top layer 23a of the decorating material 23, thermal deformation such as squeezing flow on the product surface can be prevented as much as possible. In addition, even when a fabric sheet such as woven fabric, non-woven fabric, or knitted fabric is used as the top layer 23a, it is possible to effectively solve the problem of hair fall caused by excessive heating and high-pressure press, and feel and appearance Thus, the door trim upper 20 can be molded well.

  Then, the foamed resin base material 21 and the decorating material 23 are integrally press-molded by clamping the molding upper and lower molds 41 and 42, and then the resin ribs 22 in the door trim upper 20 from the first injection machine 43a through the manifold 422a and the gate 423a. In order to form the molten resin M1, the groove portion 424 is injected and filled. At this time, compared to the conventional resin core material having a large projected area, the resin injection is sufficient to form the hollow resin ribs 22, so that the injection pressure of the resin can be lowered and the injection pressure can be overcome. It is not necessary to apply a high press pressure to the molding upper die 41, and it is only necessary to apply a press pressure sufficient to form the foamed resin base material 21 and the decorating material 23. It is possible to effectively solve the problem of falling over.

  Furthermore, heat transfer from the molten resin M1 in a high temperature state is blocked by the base cloth 23b, and the decorative material 23 is not damaged by heat, which is a major factor in maintaining good appearance performance of the product. Yes. Further, the heat insulating action of the base fabric 23b allows the pattern shape of the resin rib 22 to be arbitrarily set, improving the mold freedom of the molding die 40, reducing the number of gates, and reducing the die cost. It also has the advantage of being able to The injection timing of the molten resin M1 can be set before the mold upper and lower molds 41 and 42 are clamped. Further, as the molten resin M1, a resin in which talc is mixed in an appropriate proportion in Sumitomo Noblen BUE81E6 (polypropylene manufactured by Sumitomo Chemical Co., Ltd., melt index = 65 g / 10 min) is used. Then, as described above, after the integral press molding of the foamed resin base material 21 and the decorating material 23, the molding of the door trim upper 20 is completed by integrally molding the resin rib 22 on the back surface side of the foamed resin base material 21.

  Next, as shown in FIG. 10, in order to mold the door trim lower 30, molten resin M2 is injected and filled into the cavity 425 for molding the door trim lower 30 from the second injection machine 43b through the manifold 422b and the gate 423b. Lower 30 is formed into a required shape. In this embodiment, the molten resin M2 used as the material of the door trim lower 30 is Sumitomo Nobrene BUE81E6 (polypropylene manufactured by Sumitomo Chemical Co., Ltd., melt index = 65 g / 10 min). In comparison, since the door trim lower 30 appears on the surface of the product, the appearance performance may be improved by mixing the pigment or the like to give a desired color, or by engraving the surface on the surface. Furthermore, in order to shorten the molding cycle, the injection timing of the molten resin M2 may be set simultaneously with the molding of the resin rib 22 in the door trim upper 20.

  Further, the molten resins M1 and M2 branched and supplied to the door trim upper 20 and the door trim lower 30 can be supplied from one injection machine 43 as the same material. In this case, a branch manifold serving as a passage for the molten resin M1 supplied to the door trim upper 20 side from the main manifold communicating with the injection machine 43 and a branch manifold for the resin passage supplying the molten resin M2 to the door trim lower 30 side are provided. The molten resins M1 and M2 may be supplied separately, with a time difference.

  In the embodiment described above, the present invention is applied to the door trim 10 having the upper and lower split structures. However, the entire door trim 10 may be formed of a laminated structure, and the foamed resin base material 21, the resin rib 22, and the decoration The laminated structure of the material 23 can be applied to all interior parts such as a rear parcel shelf, floor trim, luggage trim, trunk trim, rear side trim, pillar garnish, roof trim and the like.

1 is a front view showing a first embodiment in which the present invention is applied to a two-tone type automobile door trim. FIG. It is the II-II sectional view taken on the line in FIG. It is a front view which shows the resin rib and door trim lower of the door trim upper in the door trim for motor vehicles shown in FIG. It is sectional drawing which shows the structure of the door trim for motor vehicles shown in FIG. It is a general view which shows the outline | summary of the manufacturing method of the door trim for motor vehicles shown in FIG. It is explanatory drawing which shows the formation process of the decorating material of the door trim upper in the door trim for motor vehicles shown in FIG. It is explanatory drawing which shows the lamination process of the foamed resin sheet and decorating material which are used for the door trim upper in the door trim for motor vehicles shown in FIG. It is explanatory drawing which shows the setting process of the decorating material in the manufacturing method of the door trim for motor vehicles shown in FIG. 1, and a foamed resin sheet. It is explanatory drawing which shows the formation process of the door trim upper in the manufacturing method of the door trim for motor vehicles shown in FIG. It is explanatory drawing which shows the formation process of the door trim lower in the manufacturing method of the door trim for motor vehicles shown in FIG. It is a front view which shows the conventional door trim. FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 11. It is explanatory drawing which shows the shaping | molding method of the conventional door trim.

Explanation of symbols

10 Automotive Door Trim 16 Body Panel 20 Door Trim Upper (Laminated Structure)
21 Foamed resin base material 22 Resin rib 23 Decorating material 23a Top layer 23b Base fabric 30 Door trim lower (single resin)
40 Molding mold 41 Molding upper mold 42 Molding lower mold 424 Groove (for resin rib molding)
425 Cavity (for door trim lower molding)
43a, 43b Injection machine 50 Heater device 60, 61, 71 Original roll 62 Frame 63, 72 Press roll 70 Extruder A Original material S Foamed resin sheet M1, M2 Molten resin

Claims (2)

A foamed resin base material (21) which is molded into a required shape and is lightweight and has shape retention, a resin rib (22) having a predetermined pattern shape integrated with the back surface of the foamed resin base material (21), In an automotive interior part (10) formed by adopting, in whole or in part, a laminated structure (20) composed of a decorative material (23) attached to the surface of a foamed resin substrate (21),
The decorative material (23) in the laminated structure (20) is a foamed resin sheet (S) that is a material of the foamed resin base material (21) with the base fabric (23b) lined on the back surface of the top layer (23a). The decorative material (23) is laminated integrally by the residual heat of the foamed resin sheet (S) at the time of extrusion, and the foamed resin sheet (S) laminated with the decorative material (23) is heat-softened, and then a molding die ( 41 and 42), and the molds 41 and 42 are clamped to form the foamed resin base material 21 into the required shape, and in the groove portion 424 of the molded lower mold 42. An interior part for an automobile, wherein the resin rib (22) having a required shape is integrated with the back surface of the foamed resin base material (21) by being injected and filled with the molten resin (M1). The top layer (23a) in the decorating material (23) is composed of a thermoplastic elastomer resin containing a resin component compatible with the base fiber of the base fabric (23b). The automotive interior part described.

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