JP2004299060A - Method for manufacturing multilayered molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for well manufacturing a multilayered molded product wherein at least two skin materials are arranged on the surface of a base material side by side without forming a gap to be integrally laminated to the surface of the base material. <P>SOLUTION: A mold 24 having a main resin supply gate 36 for supplying a molten resin 50 becoming the base material 14 and a mold 30 for forming a cavity 48 along with the mold 24 are prepared and at least two skin materials 12 and 16 are arranged at a predetermined position between these molds so that the respective adjacent end edges of the skin materials 12 and 16 are overlapped with each other. Then, the interval between the molds are reduced to supply the molten resin from the resin supply gate so as to fill the cavity to manufacture the multilayered molded product. The skin materials are arranged at the predetermined position so that one skin material 16 is set to the position opposed to the resin supply gate and the overlapped part 46 of the skin materials is located so that the skin material 12 on the side far from the skin material 16 on the side near to the resin supply gate is positioned on the side of the mold 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a multilayer molded product comprising a thermoplastic resin base material and a skin material bonded and integrated to at least a part of the surface thereof, and in particular, two or more skin materials having no gap therebetween. The present invention relates to a method for producing a multilayer molded product which is laminated and integrated with a base material in a state of being juxtaposed.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a multilayer molded product formed by laminating a skin material such as a synthetic resin sheet, a woven fabric, or a nonwoven fabric to a part of a surface of a base material made of a thermoplastic resin has been economical, lightweight, and has a good surface treatment. From the viewpoint of shape and the like, they are widely used in automotive interior parts (for example, door trims and instrument panels), interior and exterior parts of home appliances, and other fields.
[0003]
Such a multilayer molded product, in which two kinds of skin materials are laminated and integrated on a substrate in a state where they are juxtaposed to each other without a gap, is conventionally produced by a method as disclosed in, for example, the following Patent Document 1. It is manufactured in. In this manufacturing method, as shown in FIG. 8A, the edges of the two types of skin materials 1 and 2 are overlapped with each other, and the overlapped portion is clamped by the clamp member 3 to form the molds 4 and 5. Then, as shown in FIG. 8B, the base material is formed from the main resin supply gates 6 and 7 provided on the back side of the respective skin materials 1 and 2. This is to supply a molten thermoplastic resin (molten resin) 8 into a cavity between the dies 4 and 5 to produce a multilayer molded product. Here, the "main resin supply gate" refers to a gate capable of supplying a large part of the amount of resin necessary for manufacturing the base material, for example, 60% or more, and an auxiliary resin that compensates for the shortage. It does not include the supply gate. Hereinafter, when simply referred to as “resin supply gate”, it indicates “main resin supply gate”.
[0004]
[Patent Document 1]
JP-A-2-175111
[Problems to be solved by the invention]
As shown in FIGS. 8 (a) and 8 (b), the conventional method of manufacturing a multilayer molded product as described above has resin supply gates 6, 7 at positions facing the portions where the skin materials 1, 2 are arranged. When formed, it is possible to suitably manufacture a multilayer molded product.
[0006]
However, depending on the shape and position of the skin material, the resin supply gate may not be provided at a position facing the skin material arrangement site. For example, as in a multilayer molded product (automobile interior component door trim) 10 shown in FIG. 9, at least one of the skin materials 12 is elongated, and the position of the bonding portion is a position that covers the edge of the base material 14. In some cases, it is difficult to form a resin supply gate at a position facing the skin material arrangement site. When the molten resin is supplied from a resin supply gate located at a position distant from the skin material disposing portion, the edge of the skin material is pushed and moved by the flow of the molten resin, causing a positional shift or a design surface ( The molten resin wraps around the (surface) side, which may impair the appearance of the product. Of course, it is also possible to form the resin supply gate so as to face the skin material arrangement site, but the cost for manufacturing a mold having such a gate becomes enormous.
[0007]
Further, since the clamp member needs to be set in the mold, there is a problem that the structure of the mold is complicated and the cost is increased.
[0008]
Therefore, the present invention provides a multi-layer molded product in which at least two types (two sheets) of a skin material are bonded and integrated on the surface of a substrate, irrespective of the shape and position of the skin material, at good and low cost. It is an object of the present invention to provide a manufacturing method capable of performing such a method.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a method for manufacturing a multilayer molded product according to the present invention includes a first mold having a main resin supply gate for supplying a thermoplastic resin in a molten state, and a first mold. Providing a second mold that is openable and closable and forms a cavity between the first mold and the first mold when closed; and a first mold and a second mold that are open. Arranging two or more skin materials so that their adjacent edges overlap each other at a predetermined position between the first mold and the second mold by reducing the distance between the first mold and the second mold. Supplying and filling the molten resin from the supply gate. Further, the method according to the present invention, when disposing the two or more skin materials at the predetermined position, such that one of the two or more skin materials is located at a position facing the resin supply gate, Further, the overlapping portion between adjacent skin materials is arranged such that the skin material farther from the resin supply gate is located on the second mold side than the skin material closer to the resin supply gate. And The mold can be clamped during or after the supply of the molten resin.
[0010]
When a multilayer molded product is manufactured by such a method, the molten resin from the resin supply gate spreads from the back surface of the first skin material facing the gate to the periphery, but the molten resin from the adjacent second skin material. Since the overlapping portion is on the design surface side of the first skin material, that is, on the second mold side, the molten resin pushes the edge of the second skin material, or the molten resin is placed on the design surface side of the skin material. Can be prevented from sneaking around.
[0011]
Further, it is possible to arrange two or more skin materials at the predetermined position so that the edges of adjacent skin materials are in contact with each other without overlapping (that is, in a butt relationship) when the mold clamping is completed. Above, preferred.
[0012]
Further, a concave portion is provided in the first mold, and a ridge is provided in a position facing the concave portion in the second mold. It is preferable to arrange two or more skin materials at the predetermined positions so as to be at positions corresponding to the ridges. This is because it is possible to obtain a molded product with more favorable positioning and appearance of the joint portion of the skin material.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the present embodiment, as shown in FIG. 9 described above, a base material 14, a skin material 16 to be bonded to a substantially central portion of the surface of the base material 14, and a part of an edge of the skin material 16 The present invention relates to a method for manufacturing a multilayer molded product 10 comprising a skin material 12 which is arranged side by side with no gap and which covers an edge of an end face of a base material 14.
[0014]
First, a molding apparatus used for manufacturing the multilayer molded article 10 of FIG. 9 according to the method of the present invention will be described with reference to FIGS. As shown in the figure, the molding apparatus 20 is a general apparatus used when a single skin material is bonded to a base material, and includes a fixed mold support plate 22 and a fixed mold support plate 22. A first die 24 which is a male die supported on the upper surface, a die support plate 28 which is disposed above the die support plate 22 and is moved up and down by a driving device 26, and a lower surface of the die support plate 28 And a second die 30 which is a female die supported by the second die 30.
[0015]
The pair of upper and lower molds 24, 30 each have cavity surfaces 32, 34 corresponding to the shape of the desired multilayer molded article 10 and facing each other. When the upper and lower molds 24 and 30 are closed, the cavity surfaces 32 and 34 form cavities that substantially match the outer shape of the desired multilayer molded product 10. The material of the molds 24 and 30 is not particularly limited, and is appropriately selected from various metal materials, resins, ceramics, and the like according to the required shape, surface state, and molding conditions.
[0016]
A main resin supply gate 36 for supplying molten resin into the cavity is provided on the cavity surface 32 of the lower mold 24, and the resin supply gate 36 is connected to a resin supply passage 38 formed in the mold 24. Is in communication with The resin supply passage 38 is connected to an injection nozzle of an injection device (not shown) that can melt and inject a desired amount of the thermoplastic resin. The position of the resin supply gate 36 is a position corresponding to a portion where at least one of the skin materials (the skin material 16 in the present embodiment) is bonded, in other words, when the molten resin is supplied from the resin supply gate 36. The position where the molten resin is supplied to the back side of the skin material 16. It is preferable that the resin supply gate 36 is provided at a position corresponding to a portion where the skin material having the largest projected area is bonded. However, the product shape, the positional relationship for bonding the skin material, and the bonding of the skin material are preferable. Depending on the ratio of the portion not to be used, it may be arranged on the side of the skin material having a small transparent area, and is provided for the small skin material 16 in the present embodiment. The number of resin supply gates 36 is appropriately changed depending on the shape and size of the multilayer molded product 10 to be manufactured. When the molten resin cannot be spread in the cavity only by the main resin supply gate 36, an auxiliary resin supply gate (not shown) may be provided at other portions of the cavity surface 32 as appropriate. Good.
[0017]
Further, a clamp device 40 for clamping the skin material 12 is provided outside the lower mold 24. The clamp device 40 has a clamp frame 42. As understood from the two-dot chain line in FIG. 2, the clamp frame 42 is configured such that when the skin material 12 is supplied between the molds 24 and 30, the skin material 12 protruding from the cavity surfaces 32 and 34 of the molds 24 and 30. Is sandwiched between the upper mold 30 and the lower surface of the outer peripheral portion of the upper mold 30. In the illustrated embodiment, the clamp frame 42 has a continuous U-shape as shown in FIG. 2, but may have another form, for example, a plurality of divided forms. The clamp frame 42 can be moved up and down by a driving device 44 such as an air cylinder.
[0018]
Next, a method of manufacturing the multilayer molded article 10 of FIG. 9 using the above-described molding apparatus 20 will be described with reference to FIGS.
[0019]
First, a thermoplastic resin serving as the base material 14 of the multilayer molded article 10 and two skin materials 12 and 16 are prepared. In the present embodiment, one skin material 16 is arranged at a substantially central portion of the surface of the base material 14, and the other skin material 12 is of a different type from the skin material 16, and has an edge on the surface of the base material 14. It is arranged in the portion according to.
[0020]
The thermoplastic resin is charged into an injection device (not shown) and is in a molten state in advance.
[0021]
As shown in FIG. 3A, the skin material is supplied between the molds 24 and 30 in an open state, and is arranged at a predetermined position on the cavity surface 32 of the lower mold 24. In this state, the resin supply gate 36 is located on the back side of the skin material 16. The skin material 16 may be simply placed on the mold 24, but a part of the outer peripheral portion may be fixed by a clamp piece or a pin (not shown) provided on the mold 24. Further, as shown by a two-dot chain line in FIG. 2, a part of the outer peripheral portion of the skin material 12 protrudes from the mold 24, and this portion is placed on the clamp frame 42 and suitable fixing means such as a pin (not shown) ) To position and fix to the clamp frame 42. When the skin materials 12 and 16 are arranged on the cavity surface 32 of the mold 24 and the skin material 12 is positioned on the clamp frame 42, the skin material 12 and a part of the edge of the skin material 16 are overlapped with each other. In the portion 46, the skin material 12 farther from the resin supply gate 36 is placed on the skin material 16 closer to the resin supply gate 36.
[0022]
The degree of overlap between the skin materials 12 and 16 is preferably such that the edges of the skin materials 12 and 16 do not separate from each other in a mold clamping step described later. It is more preferable that the edges of the rims contact each other in an abutting state without overlapping.
[0023]
Next, the drive unit 26 is controlled to move the upper mold support plate 28 and the mold 30 downward, so that the outer peripheral portion of the skin material 12 is located between the lower surface of the outer peripheral portion of the upper mold 30 and the clamp frame 42. Sandwich. Then, the driving device 44 of the clamp device 40 is controlled to lower the clamp frame 42 together with the mold 30 while maintaining the state where the skin material 12 is clamped.
[0024]
When the mold 30 is lowered in this way and stopped at a predetermined position, a cavity 48 having a predetermined size is formed between the molds 24 and 30. When the cavity 48 is formed between the molds 24 and 30, when the molten resin 50 is injected from the injection device, the molten resin 50 enters the cavity 48 from the resin supply passage 38 of the mold 24 through the resin supply gate 36. Is supplied (FIG. 3 (b)). At this time, the molten resin 50 supplied from the resin supply gate 36 first presses the skin material 16 against the cavity surface 34 of the mold 30, and then gradually expands the space in the cavity 48 in the horizontal direction. It flows to. As shown in FIG. 4, in the overlapping portion 46 of the skin materials 12 and 16, since the skin material 12 is located above the skin material 16, the skin material 16 covers the edge of the skin material 12. Then, the edge of the skin material 16 is pressed against the edge of the skin material 12 by the flow of the molten resin 50, and both are brought into close contact with each other. As a result, the molten resin 50 does not push the edge of the skin material 12, and a gap is formed between the skin materials 12 and 16, or the molten resin 50 is moved toward the design side (the side facing the mold 30). Do not get into it. The cavity clearance between the dies 24 and 30 when the molten resin 50 is supplied is appropriately determined depending on the types of the skin materials 12 and 16 to be used, the product shape and dimensions, and the like.
[0025]
Next, the mold 30 is further lowered to perform mold clamping, and the molten resin 50 filled in the cavity 48 is cooled and solidified (FIG. 3C). The timing of performing the mold clamping may be during the supply of the molten resin 50 or after the supply is completed. However, when performing the mold clamping after the supply is completed, the mold clamping should be started immediately after the completion of the supply of the molten resin 50. Is preferred. At the time of this mold clamping, a suitable tension is applied to the skin material 12 since the sandwiched portion of the skin material 12 between the clamp frame 42 and the mold 30 moves downward with respect to the mold 24. In addition, by controlling the amount of movement, the overlapping portion between the skin material 12 and the skin material 16 can be reduced, and more preferably, both can be juxtaposed in an abutting state without overlapping.
[0026]
After a predetermined cooling / solidification time has elapsed, the mold support plate 28 and the mold 30 are raised, and the base material 14 formed by solidifying the molten resin 50 and the skin materials 12 and 16 are bonded together. Take out the multilayer molded product. Thereafter, processing such as cutting off the protruding portion of the skin material 12 and winding it around the back surface of the product is performed, and the multilayer molded product 10 as a product shown in FIG. 9 is completed. As described above, since the molten resin does not flow into the design surfaces of the skin materials 12 and 16 and the position of the skin materials 12 and 16 does not shift, the appearance of the product is extremely good.
[0027]
In addition, as the thermoplastic resin, a resin generally used in compression molding, injection molding, extrusion molding or the like can be applied as it is. For example, general thermoplastic resins such as polypropylene, polyethylene, acrylonitrile-styrene-butadiene block copolymer, polyamide such as polystyrene and nylon, polyvinyl chloride, polycarbonate, acrylic resin, and styrene-butadiene block copolymer, EPM and EPDM And the like, a mixture thereof, and a polymer alloy using the same. These may be non-foamable or foamable.
[0028]
In addition, these thermoplastic resins may contain fillers such as commonly used glass fibers and various inorganic or organic fillers, if necessary, and, of course, various pigments and lubricants commonly used, Additives such as an antistatic agent and a stabilizer may be blended.
[0029]
As the skin material, any material can be used as long as it does not melt even when in contact with the thermoplastic resin in a molten state, and can be thermally fused to the thermoplastic resin, for example, a woven or knitted fabric such as a moquette or a limit, a needle, or the like. A nonwoven fabric such as a punch carpet, a metal foil, a sheet or a film of a thermoplastic resin or a thermoplastic elastomer can be appropriately selected according to the thermoplastic resin of the base material.
[0030]
These skin materials may be two or three or more laminated skin materials in which a foam layer and a backing layer are appropriately laminated as necessary, and a skin material in which foam layers are laminated is particularly preferable. These laminated skin materials can be heat-fused with the thermoplastic resin of the base material, or can be bonded to the thermoplastic resin of the base material by impregnating the skin material to be the surface layer with the thermoplastic resin in a molten state. It is necessary to be something.
[0031]
In this case, as the foam layer, a polyolefin foam such as polypropylene or polyethylene, a polychlorinated chloride foam, or a soft or semi-rigid polyurethane foam may be used.
[0032]
As the backing layer, a nonwoven fabric, a sheet or film of a synthetic resin, or the like can be used. As the fibers constituting the nonwoven fabric, natural fibers such as cotton, wool, silk, hemp, or synthetic resins such as polyamide, polyester, and nylon can be used. A nonwoven fabric is used. For example, non-woven fabrics of a needle punch type, a thermal bond type, a spun bond type, a melt blow type, a spun lace type and the like can be mentioned. Examples of the sheet or film made of a synthetic resin include a thermoplastic resin such as polypropylene and polyalkylene, and a sheet and film of a polyolefin-based thermoplastic elastomer, and those having a fusibility with the thermoplastic resin of the base material are used.
[0033]
As described above, the preferred embodiments of the present invention have been described in detail, but it goes without saying that the present invention is not limited to the above embodiments.
[0034]
For example, a foamable thermoplastic resin can be used for the substrate 14. In order to foam the base material 14, the cavities 48 were formed between the molds 24 and 30 by positioning the skin materials 12 and 16 in the same manner as in the procedure of FIGS. 3A to 3C described above. Thereafter, the molten resin 50 containing the foaming material is supplied from the resin supply gate 36, and the mold is clamped. Then, first, primary cooling is performed in the mold clamping state shown in FIG. 3C to form a skin layer on the molten resin 50 in contact with the cavity surface 34 of the mold 30. The primary cooling time at this time varies depending on various conditions such as the temperature of the mold, the temperature of the molten resin, and characteristics, but is usually about 0.1 to 5 seconds. After the primary cooling for a predetermined time is completed, as shown in FIG. 3D, when the mold 30 is moved upward to enlarge the cavity 48, the molten resin 50 is confined in the unsolidified portion of the supplied molten resin 50. The foaming gas generated by the decomposition of the foaming agent expands, and the thickness increases while forming a foam layer in the thickness direction of the molded article. When the cavity clearance reaches the product thickness after foaming, the cavity expanding operation, that is, the rise of the mold 30 is stopped, and the molten resin 50 is cooled and solidified while maintaining the state.
[0035]
As the foaming agent used in this method, a known chemical foaming agent used when producing a foam of a thermoplastic resin serving as a base can be used. Specifically, inorganic foaming agents such as sodium bicarbonate, ammonium bicarbonate and ammonium carbonate, nitroso compounds such as N, N'-dinitrosopentamethylenetetramine, and azo compounds such as azodicarbonamide and azopisisobutyronitrile. Blowing agents such as compounds, sulfonyl hydrazides such as benzenesulfonyl hydrazide, toluenesulfonyl hydrazide, and diphenyl sulfone-3,3'-disulfonyl hydrazide, and p-toluenesulfonyl semicarbazide can be used. It is a preferred embodiment to add salicylic acid, urea and a foaming aid containing these as necessary. Of course, the type of the foaming agent is selected in consideration of the melting temperature of the thermoplastic resin to be used, the desired expansion ratio, and the like. The amount of addition is adjusted in consideration of the strength, density and the like of the target molded product, but is generally 0.1 to 5 parts by weight based on 100 parts by weight of the resin. Further, in addition to the chemical foaming agent, liquid or gaseous carbon dioxide and / or nitrogen may be directly injected into the molten resin for foaming.
[0036]
The mold used in the present invention is not limited to the mold shown in FIGS. 1 to 3. As shown in FIG. 5, a mold 54 having a ridge 52 and a recess 56 at a position corresponding to the ridge 52 are provided. May be used. In this case, the ridges 52 are provided at positions corresponding to the boundaries between the skin materials 12 and 16 in the multilayer molded product 10 after the completion of the production, that is, so-called edges 18 (see FIG. 9). In the configuration shown in FIG. 5, the same or corresponding parts as those in the configuration shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0037]
When the multilayer molded product 10 of FIG. 9 is manufactured using the molds 54 and 58, the skin materials 12 and 16 are arranged at predetermined positions between the molds 54 and 58 in the same manner as described with reference to FIG. Thereafter, when the mold 54 is lowered, the overlapping portion between the skin materials 12 and 16 is in a state as shown in FIG. In this state, the ridge 52 directs the flow of the molten resin 50 downward, and then flows outward along the inner surface of the concave portion 56, so that the molten resin 50 is further coated on the design surface side of the skin materials 12 and 16. (The side facing the mold 54) will not enter.
[0038]
When supplying the molten resin 50, it is preferable to set the position so that the cavity clearance between the molds 54 and 58 is smaller than the height of the ridge 52. That is, it is preferable that the tip of the ridge 52 is located at a position where it slightly enters the recess 56. If the molten resin is supplied in a state where the cavity clearance is larger than the height of the ridge 52, the ridge 52 does not function as a flow deflecting function or a weir of the molten resin 50, and the design of the skin materials 12, 16 is not performed. This is because the molten resin 50 may enter the surface side and cause a poor appearance of the product.
[0039]
As described above, the mold is clamped during or after the supply of the molten resin 50 and the multilayer molded article 10 is taken out of the molds 54 and 58 after cooling and solidification.
[0040]
Furthermore, in the above-described embodiment, two types (two sheets) of the skin materials 12 and 16 are used, but three or more types (three sheets) of the skin materials are juxtaposed to each other without gaps and bonded to the base material. In this case, the present invention is applicable. That is, in the present invention, simply, a plurality of skin materials are stacked in a stepwise manner, and the molten resin flows from the skin material closest to the resin supply gate, so that the molten resin flows toward the design surface side of the skin material. Since it is intended to prevent wraparound and displacement of the skin material, for example, three or more skin materials 100, 102, 104, and 106 are arranged in a manner as shown in FIGS. The position of the main resin supply gate 36 for supplying 50 may be determined.
[0041]
Further, in the above-described embodiment, the molding device 20 uses a so-called vertical type in which the mold clamping direction is the vertical direction. The present invention can also be applied to a horizontal molding device that is movable in a horizontal direction.
[0042]
Further, in the above embodiment, the skin material is not preliminarily treated, but the skin material may be preheated or preformed before being supplied between the dies. In particular, when preforming is performed, there is an advantage that accurate positioning can be performed.
[0043]
【The invention's effect】
As described above, according to the production method of the present invention, it is possible to efficiently produce a multilayer molded product having good positioning properties and appearance of the skin material. In addition, since the position of the resin supply gate may be a general position, there is an effect that the cost for manufacturing the mold can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a molding apparatus that can be used in a method for producing a multilayer molded article according to the present invention.
FIG. 2 is a schematic view taken along the line II-II in FIG.
3 (a) to 3 (d) are schematic explanatory views showing step by step the method for producing a multilayer molded article according to the present invention, and FIG. 3 (d) shows a case where a multilayer molded article having a foamable base material is produced. FIG.
FIG. 4 is an enlarged view of a mold showing a flow state of a molten resin.
FIG. 5 is a schematic view showing another example of a molding apparatus that can be used in the method for producing a multilayer molded article according to the present invention.
FIG. 6 is a view similar to FIG. 4, illustrating a method of manufacturing a multilayer molded product using the molding apparatus of FIG. 5;
FIGS. 7A and 7B are schematic explanatory diagrams each showing an application example of the present invention when there are three or more skin materials.
FIG. 8 is a schematic explanatory view showing a method of manufacturing a conventional general multilayer molded product.
FIG. 9 is a schematic view showing an example of a multilayer molded product manufactured by the method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Multilayer molded article, 12 ... Skin material, 14 ... Base material, 16 ... Skin material, 18 ... Edge part, 20 ... Molding apparatus, 24, 58 ... 1st metal mold, 30, 54 ... 2nd metal Mold, 36: Main resin supply gate, 40: Clamping device, 48: Cavity, 50: Molten resin, 52: Ridge, 56: Recess.

Claims (4)

A method for producing a multilayer molded article comprising: a base material made of a thermoplastic resin; and two or more skin materials bonded and integrated to at least a part of the surface of the base material and juxtaposed to each other without gaps. ,
A first mold having a main resin supply gate for supplying a thermoplastic resin in a molten state, and a first mold that is openable and closable with respect to the first mold, and is closed when the first mold is closed. Providing a second mold that forms a cavity between;
Arranging the two or more skin materials at predetermined positions between the first mold and the second mold in an open state such that adjacent edges overlap each other;
Supplying a thermoplastic resin in a molten state from the main resin supply gate by narrowing an interval between the first mold and the second mold, and filling the molten resin.
One of the two or more skin materials is located at a position facing the main resin supply gate, and the overlapping portion between the adjacent skin materials is closer to the main resin supply gate. The two or more skin materials are arranged at the predetermined position such that the skin material farther from the main resin supply gate than the skin material is located on the second mold side. Manufacturing method of a multilayer molded product. The method for producing a multilayer molded product according to claim 1, wherein the molten thermoplastic resin is supplied and the mold is clamped. The two or more skin materials are arranged at the predetermined position such that edges of the skin materials adjacent to each other are in contact with each other without overlapping at the time of completion of mold clamping. Manufacturing method of multilayer molded product. A recess is provided in the first mold, and a ridge is provided in the second mold at a position facing the recess,
The two or more skin materials are arranged at the predetermined position such that an edge portion between adjacent skin materials in the multilayer molded product after the completion of manufacturing is located at a position corresponding to the ridge. Item 4. The method for producing a multilayer molded product according to any one of Items 1 to 3.

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