JPS63288737A - Preparation of laminated resin press molded item - Google Patents

Abstract

PURPOSE:To make it possible to carry out continuously resin sheet-making, press-bonding and interfacial fusion of a resin skin material and press-molding, by carrying out interfacial fusion of two or more mixed resin sheets by controlling temp. at m.p. or higher of the resin skin material and press-molding it in the decreasing temp. range close to the solidifying temp. CONSTITUTION:A mixed resin is molten by heating at the m.p. or higher of a resin component having the highest m.p. and extruded from a die 1. This extruded molten resin is passed through sheet molding rolls 2 and 3 and sheet- making is carried out while surface molding and thickness adjusting are being done. Then, a resin skin material RS is inserted with a resin sheet PS of high temp. between the sheet-molding rolls 2 and 3 just before the temp. controlling process TC and the resin skin material RS is molten on its contacting interface by the heat held by the resin sheet PS and fused together. In the case of a mixed resin of polypropylene resin and polyethylene resin, it is molten at 200 deg.C and resin sheet-making is carried out. Interfacial fusion is accelerated around 190 deg.C which is the decreasing temp. being higher than the m.p. of the resin skin material by means of the temp. controlling rolls and lamination is thereby carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the manufacture of press-molded products in which a skin material is laminated to a resin base material, for example, a resin press-molded product in which a nonwoven fabric is laminated on the surface of a resin base material such as a vehicle interior plate. This invention can be understood as an applied patent of Patent No. 127B242 (Japanese Patent Publication No. 59-23691) provided by Shunjin.

Prior art For example, Japanese Patent Publication No. 56-5729 discloses a method of laminating a nonwoven fabric on the surface of a resin base material. This prior example shows a method of laminating a nonwoven fabric by pressing it onto a resin sheet extruded from a die. This prior example only suggests using a flat plate with nonwoven fabric crimped as a core material, but does not teach anything about a series of techniques for laminating and press forming, and also does not teach anything about the laminate form of nonwoven fabric. In other words, it is only intended to have an anchoring effect.

Generally, resin press-molded products are made by reheating a resin sheet stockpiled by the manufacturer to make a softened sheet, which is then handled and charged into a mold and press-molded. However, when laminating a skin material such as the nonwoven fabric mentioned above, the method described above is used. A skin material is further charged on the surface of the softened resin sheet, and at the same time as press molding, the skin material is pressed onto the softened resin sheet to achieve layer adhesion through adhesion or an anchoring effect.

Another method is to bond a skin material to a press-molded product through an adhesive.

Problems to be Solved by the Invention As mentioned above, in the prior art, there is no disclosure whatsoever regarding a specific method for forming a sheet of molten resin, laminating a skin material, and press-molding in a series of steps.

In addition, if the anchoring effect of crimping or flat adhesion is relied upon, it is impossible to produce homogeneous, high-strength, and highly reliable laminate resin press-molded products, resulting in the production of defective products such as wrinkles and adhesive defects. This can lead to poor yields.

Furthermore, in the method of bonding the skin material by press molding as in the latter example above, it is impossible to prevent deterioration of the physical properties due to reheating of the base material, resulting in cracking and rough skin, and the thermal energy required to reheat the material that has been formed into a sheet in advance. There is a loss of electricity, which imposes an economic burden such as electricity consumption due to reheating, and productivity also deteriorates.

Furthermore, in the former example, it is difficult to press-form a flat plate once laminated with nonwoven fabric, and it is not technically sustainable to reheat and press-form the same laminated plate.

In view of the above-mentioned circumstances and problems, the present invention has been conceived with regard to integrated production of resin sheet molding, skin material lamination, and press molding.

Means for Solving the Problems The present invention uses a mixed resin of two or more types and utilizes the heat retained when it is melted at a temperature higher than the melting point of the highest melting point resin to form a resin sheet. While controlling the temperature of the resin sheet to a temperature higher than the melting point of the resin skin material such as nonwoven fabric, the heat retained in the sheet promotes interfacial fusion of the skin material to obtain a strong laminate, and the temperature is also controlled during subsequent press molding. The drop point is determined to be in the range from the melting point of the lowest melting point resin in the maximum specific heat range to around the freezing point (crystallization peak temperature), and the mold is inserted and pressed while controlling the temperature to preferably maintain this temperature range. By performing molding, it is possible to shape the product and stabilize the implantation of the skin material.

In the present invention, the highest melting point resin component is used to set the appropriate temperature of the sheet for achieving interfacial fusion of the resin skin material, and in order to make it work more effectively, the highest melting point resin component is used as a suitable example. By using the same type of resin as the skin material, the mixed resin is made to have compatibility, and the melting point of the same highest melting point resin is used as a reference to form the mixed resin into a sheet and to ensure healthy interfacial fusion of the resin skin material. Furthermore, we focused on the characteristic that the above mixed resin begins to solidify (crystallize) at a temperature slightly lower than the melting point of the lowest melting point resin when the temperature drops after melting, and selected the lowest melting point resin to achieve the maximum specific heat range. A temperature at a certain freezing point is selected, and the mold charging temperature is determined thereby to appropriately perform press molding.

A suitable material for the highest melting point resin is polypropylene resin, which is the most versatile resin skin material.

In view of this, the present invention uses a mixed resin containing polypropylene resin as the highest melting point resin component and polyethylene resin as the lowest melting point resin component, and further uses the mixed resin to interfacially fuse a polypropylene resin skin material. provide a method to do so.

The present invention includes examples in which the mixed resin is compatible with the resin skin material, but is not the same type of resin.

In addition, as an invention related to the above, in order to maintain the set temperature (temperature range from the melting point of the lowest melting point resin to the vicinity of the freezing point) after lamination and before charging into the mold, a resin sheet is bonded to the interface fusion surface of the resin skin material. The temperature is controlled by radiant heat from the opposite surface, and the resin sheet that is the base material for molding is heated to an appropriate temperature, eliminating any adverse thermal effects on the skin material, and allowing mold injection and press molding to be carried out appropriately. The present invention provides a method for manufacturing a laminated resin press-molded product.

According to the present invention, while processing the mixed resin into a resin sheet, it is possible to adjust the temperature to the melting temperature of the resin skin material and to achieve good interfacial fusion using the heat retained in the same sheet, thereby eliminating mere pressure bonding (anchoring effect). ), it is possible to achieve more stable and strong lamination than in the case of laminate, and as a result, more effective use of heat can be achieved.

In addition, in the conventional press molding method, in order to smooth out wrinkles, it was necessary to overlay the expensive skin material on the entire surface of the resin sheet and use the holder of the press machine to hold the sheet at the periphery of the mold. However, by implementing the present invention, the skin material is firmly fused and held to the resin sheet in advance, so it can be carried out without planning to hold it down with a blank holder, and the skin material can be placed near the required area of the product. A limited amount of cloth can be hung. Therefore, loss due to trimming can be minimized.

In addition, in the present invention, by selecting a resin that has compatibility between the mixed resin and the resin skin material, or by using the same type of resin as the resin skin material as the highest melting point resin component, compatibility is achieved, and the melting point By performing the lamination while matching the above, the interfacial fusion between the resin skin material and the resin sheet can be made more sound and strong. Moreover, it eliminates the difficulties of temperature control for melting mixed resin to form a sheet and controlling the temperature of the resin sheet to a temperature higher than the melting point of the resin skin material, making the control work extremely easy.

Further, the present invention is to form a mixed resin into a sheet as described above, and press-form the sheet at a predetermined temperature drop point while properly laminating (interfacial fusion) the resin skin material. That is, in the present invention, we focused on the fact that when the temperature of the mixed resin falls, it begins to solidify (crystallize) at a temperature lower than the melting point of the lowest melting point resin, and the laminated resin sheet is allowed to cool naturally without solidifying as it is. While promoting the accompanying temperature drop, a temperature drop range is selected in which the temperature of the resin sheet matrix falls from the melting point of the lowest melting point resin component in the mixed resin to around the freezing point, and the resin sheet is charged into a mold and press molded.

According to the present invention, press molding can be performed at a temperature sufficiently lower than the melting point of the skin material such as nonwoven fabric, and the laminate resin press molding can be made in an extremely beautiful raised state without causing the nonwoven fabric to sag or the raised portion to adhere. In addition to being able to provide products, we are also able to perform press forming in the appropriate molding department.
Sound shaping can be performed without impairing the physical properties of the laminated resin sheet. Furthermore, the above-mentioned skin material implantation is made stable by the press molding, and the interfacial fusion is strengthened to make it more stable.

Also, mixed resins with different melting points exhibit maximum specific heat near the freezing point, which is lower than the melting point of the lowest melting point resin when the temperature is lowered, and are most stable in terms of temperature and are difficult to cool. Therefore, by capturing this range and performing press molding and press molding, it is possible to shape the resin sheet in a sound manner without causing a rapid temperature drop due to cooling of the mold, and in particular, the sheet surface can be
It effectively prevents the occurrence of cracks, rough skin, etc. due to cooling, and also effectively prevents problems such as separation of the skin material, and does not impair the nap condition.

Furthermore, as shown in the second aspect of the invention, when the resin sheet is put into the press mold, the temperature of the resin sheet is controlled by radiant heat from the surface opposite to the surface to which the resin skin material is fused to maintain the temperature within the mold. In addition to preventing variations in input temperature, it also effectively prevents thermal deterioration of the skin material and poor napping, and also equalizes the temperature of the resin sheet that serves as the molding base on its surface and core, eliminating molding defects due to temperature unevenness. effectively prevent.

Preferred embodiments of the present invention will be described below with reference to the drawings.

In the present invention, two or more mixed resins having sufficiently different melting points are used as the base material of the resin sheet. Considering that the mixed resin is three or more types, even if there are two types, the resin component with the highest melting point is called the highest melting point resin component, and the resin component with the lowest melting point is called the lowest melting point resin component. To call.

The above mixed resin is heated and melted at a temperature higher than the melting point of the highest melting point resin, extruded from a die 1 as shown in Fig. 1, and the extruded molten resin is passed between sheet forming rolls 2 and 3 to form the surface and increase the thickness. Create a sheet as you go. The resin sheet PS
The resin sheet PS is further rotated through a temperature control roll 4.5.
The temperature is adjusted so that it is maintained at a temperature higher than the melting point of the resin skin material RS for lamination in a predetermined temperature adjustment step TCI.

In this way, the resin skin material RS is inserted between the sheet forming rolls 2.3 immediately before the temperature control process T C1 together with the high temperature resin sheet PS as shown by the imaginary line, or the resin skin material RS is inserted between the sheet forming rolls 2. 4 and spread it over the resin sheet PS, and while passing through the temperature control step TC, the resin sheet PS
Due to the retained heat, the 9 resin skin material RS is melted and fused at the contact interface. The resin skin material R5 is a nonwoven fabric or other fabric, and is supplied in the form of a strip or a sheet cut to a fixed size as shown in FIG.

The resin skin material R3 is rolled into a resin sheet P on the temperature control roll 4.
The hooks are aligned so as to be on the inside of S, and the hooks are pressed together by applying surface pressure from the outside with the resin sheet PS in the mating surface area to proceed with the subsequent interfacial fusion. Alternatively, the resin skin material RS is placed on the roll 4 so as to overlap the outer surface of the resin sheet PS and crimped and fused. In the crimping process, the skin material RS is anchored and the anchored portion is fused.

As an example of the composition of the above-mentioned mixed resin, an example of a mixture of a polypropylene resin component and a polyethylene resin component is listed. Polypropylene resin has a melting point of around 170°C, and polyethylene resin has a melting point of 170°C.
The two resins have a melting point of around 30°C, the former being the highest melting point resin and the latter the lowest melting point resin, and are highly compatible and have a sufficient difference in melting point.

Preferably, the same type of polypropylene resin as the highest melting point resin is used as the resin skin material RS.

This provides compatibility between the mixed resin ps and the resin skin material RS, and also makes the melting points of the two the same. As a result,
The resin skin material R5 interfacially fuses with the resin sheet PS with high affinity to form a robust laminate, and due to their matching melting points, it is extremely easy to form a sheet and to control the temperature for the above-mentioned interfacial fusion, making it suitable for fA tone. help in becoming

In the present invention, as described above, it is proposed that the mixed resin contains the same type of resin as the resin skin material as the highest melting point resin component, and a suitable example is that the highest melting point resin component and the resin skin material are polypropylene resin. Indicate the case.

In the case of the above-mentioned mixed resin of polypropylene resin and polyethylene resin, the temperature range is, for example, 170° to 200°C, e.g.
At the same time, it is melted at 00°C and made into a resin sheet, and laminated using a temperature control roll (crimping roll) at a temperature of 170°C or higher, for example, at a temperature drop of around 190°C, which is higher than the melting point of the resin skin material, to promote efficient interfacial fusion. do.

In addition to the above, examples of compositions of two types of mixed resins include polyamide 66 (melting point 250'C) and polyamide 6 (melting point 215'C).
Examples include mixed resins having compatibility at (°C). When using this mixed resin, polyamide 66 is preferably used as the resin skin material RS to match the compatibility and melting point,
The interfacial fusion is achieved at a temperature higher than the melting point of the highest melting point resin.

In each of the above composition examples, each resin component of the mixed resin has compatibility,
In addition, although the case where the resin skin material RS is also compatible is shown, one of the mixed resins is made of a resin that is compatible with the resin skin material RS to create compatibility between the mixed resin and the same skin material R3. Typically, mixed resins are composed of the highest melting point resins of the same type.

When carrying out the present invention in each of the above two composition examples, it is possible to use a resin having a higher melting point than the highest melting point resin as the resin skin material R5, and to heat-melt it and form a sheet at a temperature higher than the skin material in accordance with the above. , the interfacial fusion is promoted at a temperature lower than the melting temperature and higher than the melting point of the skin material.

Furthermore, examples of compositions of mixed resins of three or more types include examples of mixing polypropylene resin, polyethylene resin, and ethylene vinyl acetate resin (melting point 70°C to 97'C), or polyamide 66, polyamide 6, and polyamide 12 (melting point 178
Both composition examples show cases where the three resins are compatible, and according to the above, the three mixed resins are melted above the melting point of the polypropylene resin or polyamide 66, and the resin skin material RS is mixed. Interfacial fusion occurs due to the heat retained in the resin sheet PS. In this case, by utilizing the fact that there are three or more types of mixed resin, the resin skin material RS has a melting point higher than the melting point of polypropylene resin or polyethylene resin, which is a resin other than the lowest melting point resin (ethylene vinyl acetate resin) in the former composition example. Select the one that has. Preferably, in consideration of compatibility, a skin material made of polypropylene resin is used, or
A skin material made of polyethylene resin is used. Similarly, in the latter composition example, it is preferable to use polyamide 66 other than the lowest melting point resin (polyamide 12) or a skin material having the same polarity as polyamide 6.

In the above example, when polyethylene resin or polyamide 6 is used as the skin material, the temperature control roll 4.5 adjusts the temperature of the resin sheet PS so that it is at least the melting point of the polyethylene resin or polyamide 6, and Attempt to fuse the interface using heat.

The resin sheet PS to which the resin skin material RS is interfacially fused as described above is provided to the cutting section 7 via the pinch rolls 6 and cut into unit lengths.

Next, each unit laminated resin sheet PS° is pressed by conveyors 8a and 8b! ! During this time, the material is transported to the trough, and during this time the temperature is encouraged to fall, and when the temperature falls within a predetermined range, it is put into the lower mold 11, and the upper mold 12 is immediately lowered to perform press forming. A suitable sheet feeder, for example, a vacuum feeder 14, is used to feed the sheet into the lower mold 11.

Then, as the temperature decreasing range, a temperature in the vicinity of the freezing point from the melting point of the lowest melting point resin in the mixed resin is selected and the mold is charged.

That is, in the above composition example, when the mixed resin of polypropylene resin and polyethylene resin has a low melting point, the above-mentioned mold injection and press molding are performed in the temperature range from the melting point of 130''C to around the freezing point of 125''C. At the same time as shaping the product, the resin skin material RS is fixed to strengthen the bond.

In general, a mixed resin of two or more types with different melting points has the characteristic that it starts to solidify (crystallize) at a temperature lower than the melting point of the lowest melting point resin when the temperature is lowered, and shows the maximum specific heat from the melting point to the vicinity of the freezing point, that is, the maximum heat amount He is in the coldest state, holding
It also exhibits appropriate surface rigidity and stable heat retention, meeting the optimal conditions for press molding.

The same applies to other composition examples. For example, in the case of a mixed resin of the polypropylene resin, polyethylene resin, and ethylene vinyl acetate resin, solidification starts at a temperature lower than the melting point of ethylene vinyl acetate resin, which is the lowest melting point resin, at 0°C. Therefore, this freezing point is captured and the mold is added.
Press molding is performed to fix the shape and skin material.

In press molding, inserting the resin sheet into the mold and clamping the mold are essential, and the natural cooling during this time, especially the A cooling at the contact surface with the lower mold, significantly impairs the moldability.The present invention solves this problem by setting the above conditions. Eliminate as much as possible.

In order to ensure the above-mentioned temperature conditions, a temperature-controlled furnace 9 is arranged on the input side to the press device 10 as shown in FIGS. 1 and 2, and the unit laminated resin sheet PS cut in the cutting section 7 is
The resin sheet PS is introduced into the temperature-controlled furnace 9 by a conveyor 88, and during the conveyance within the furnace, the temperature of the resin sheet PS is controlled in a temperature-control step TC so that the temperature of the resin sheet PS falls within the above-mentioned set temperature range.

As the most preferable temperature control method, as shown in the figure, an infrared heating device 15 is installed in a non-contact state facing the surface of the resin sheet PS opposite to the surface on which the resin skin material R5 is laminated, and the radiant heat is used to heat the resin sheet PS. Heat only. On the other hand, the skin material R3 is heated at a lower atmospheric temperature in the furnace.

For example, in the case of a mixed resin of polypropylene resin and polyethylene resin, the resin sheet PS is
While heating and keeping warm to around 53C, the skin material made of polypropylene resin is heated and keeping warm at a lower ambient temperature, for example around 100C. in this case,
At least the introduction conveyor 8a uses a perforated belt having a large number of ventilation holes. In addition, the output conveyor 8b has one end located in the furnace and the other end extended to the side of the press device arranged at the furnace outlet, and presses the temperature-controlled unit laminated resin sheet PS' at a faster speed by changing the speed. Provide to the device.

As shown in Figure 4, the unit laminated resin sheet ps
The resin skin material R3 in ' is the interfacial bonding layer R as described above.
S' is firmly held on the surface of the resin sheet 823, which is advantageous for suction by the vacuum feeder 14, etc., and for mold injection.

In addition, focusing on the above-mentioned interfacial fusion effect, the resin skin material RS is used as an unnecessary portion of the resin sheet PS (the portion to be trimmed).
Do not cover the area with cloth, but keep it within the range that covers the necessary parts of the product as much as possible. E indicates the non-stretched fabric part of the resin skin material R5. When the resin skin material RS is formed into a unit sheet and stretched on the surface of the resin sheet PS for interfacial fusion, the non-stretched fabric part E is formed around the necessary part. can be formed.

When loading into the press device, the non-stretched fabric part E is placed on the top surface of the blank holder 13 as shown in FIG. 3, and the pressing between it and the upper mold 12 during mold clamping takes into consideration only the prevention of wrinkles of the resin sheet PS. do. This makes it possible to minimize the loss of expensive resin skin material.

As described above, extrusion of the molten resin, formation of a belt-shaped sheet, lamination by interfacial fusion of the resin skin material, and press molding are all carried out in an integrated manner, resulting in the continuous production of laminated resin press-molded products with beautiful naps. be.

As described in detail, according to the present invention, the heat retained in the resin sheet of the mixed resin can be used to achieve strong laminate fusion of the skin material, and the heat retention state of the resin sheet and the laminate fusion can be adjusted when the temperature drops. Appropriate press molding can be carried out using the adhesion state, and processes such as forming mixed resin into resin sheets, crimping and interfacial bonding of resin skin materials, and press molding of the laminated resin sheets can be carried out rationally in integrated production. .

That is, according to the present invention, while processing the mixed resin into a resin sheet, it is possible to adjust the temperature to the melting temperature of the resin skin material and to perform good interfacial fusion using the heat retained in the sheet, thereby eliminating the need for mere pressure bonding (anchoring). It is possible to achieve a more stable and strong lamination compared to the case where the laminate is made using the laminate method (effects), and as a result, the effective use of heat can be achieved.

In addition, in the conventional press molding method, in order to smooth out wrinkles, it was necessary to overlay the expensive skin material on the entire surface of the resin sheet and use the holder of the press machine to hold the sheet at the periphery of the molding side. However, according to the present invention, the skin material can be firmly fused and held to the resin sheet before press molding. The material can be applied only to the area required for the product. Therefore, loss due to trimming can be minimized.

In addition, in the present invention, by selecting a resin that has compatibility between the mixed resin and the resin skin material, or by using the same type of resin as the resin skin material as the highest melting point resin, the compatibility and melting point are matched, By performing the above lamination,
The interfacial fusion between the resin skin material and the resin sheet can be made sounder and stronger. Moreover, it eliminates the difficulty of temperature control for melting the mixed resin and forming it into a sheet, and controlling the temperature of the resin sheet to a temperature higher than the melting point of the resin skin material.
This makes management work extremely easy.

Furthermore, in the present invention, we focused on the fact that when the temperature of the mixed resin falls, it begins to solidify (crystallize) at a temperature lower than the melting point of the lowest melting point resin, and the resin sheet matrix is The temperature range is selected so that the temperature falls from the melting point of the lowest melting point resin in the mixed resin to around the freezing point, and charging into a mold and press molding are performed appropriately.

According to the present invention, press molding can be performed at a temperature sufficiently lower than the melting point of the skin material such as nonwoven fabric, and a laminate resin press molded product can be produced in an extremely beautiful raised state without causing the nonwoven fabric to set or adhere to the raised part. In addition, it is possible to perform press molding at an appropriate molding temperature.
Sound shaping can be performed without impairing the physical properties of the laminated resin sheet. In addition, the press molding makes the implantation of the skin material more stable.

In addition, mixed resins with different melting points exhibit maximum specific heat near the freezing point, which is lower than the melting point of the lowest melting point resin when the temperature is lowered, and are most stable in terms of temperature and are difficult to cool. By doing this, the resin sheet can be shaped in a sound manner without causing a rapid temperature drop due to cooling of the mold, and in particular prevents the sheet surface from being overcooled and causing cracks, rough skin, etc. This effectively prevents problems such as separation of the skin material, and does not impair the nap condition.

Furthermore, as shown in the second aspect of the invention, when the resin sheet is put into the press mold, the temperature of the resin sheet is controlled by radiant heat from the surface opposite to the surface to which the resin skin material is fused to maintain the temperature within the mold. In addition to preventing variations in input temperature, it also effectively prevents thermal deterioration of the skin material and poor napping, and also equalizes the temperature of the resin sheet that serves as the molding base on its surface and core, eliminating molding defects due to temperature unevenness. The production process from molding of molten resin sheets to lamination and press molding of resin skin materials can be carried out in an integrated continuous line, improving productivity and reducing costs. , and can achieve the purpose of improving the quality of laminated resin products.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a manufacturing apparatus for laminated resin press-molded products that explains the present invention in detail, FIG. 2 is a plan view of the same, and FIG. 3 is a press showing the state in which a unit laminate resin sheet is loaded into a mold. FIG. 4 is an enlarged sectional view illustrating a state in which a resin skin material is interfacially fused to a resin sheet. l...Die, 2.3...Sheet forming roll, 4゜5
...Temperature control roll, 9...Heating furnace, TC,, TC,...
...Temperature control process, 10...Press device, 11...Lower die, 12...Upper die, ps...Resin sheet, RS...
Resin skin Figure 3 I Figure 4

Claims (6)

[Claims] (1) A resin sheet that has been melted and formed into a sheet at a temperature higher than the melting point of the highest melting point resin in a mixture of two or more resins is controlled to a temperature higher than the melting point of the resin skin material, and the resin skin material is spread on the surface of the resin sheet. The heat retained in the sheet promotes the interfacial fusion of the resin skin material to the same sheet, and the resin sheet for interfacial fusion of the resin skin material is heated from the melting point of the lowest melting point resin in the mixed resin to the freezing point. A method for producing a laminate resin press-molded product, characterized by performing press molding by charging the product into a mold in a temperature decreasing range. (2) The method for producing a laminate resin press-molded product according to claim 1, wherein the mixed resin contains the same type of resin as the resin skin material as the highest melting point resin. (3) The method for producing a laminate resin press-molded product according to claim 1, wherein the resin skin material and the mixed resin are compatible with each other. (4) The method for producing a laminate resin press-molded product according to claim 1, wherein the mixed resin contains a polypropylene resin as the highest melting point resin component and a polyethylene resin as the lowest melting point resin component. (5) Claim 4, characterized in that the skin material is the same type of polypropylene resin as the highest melting point resin component.
A method for manufacturing a laminated resin press-molded product as described in Section 1. (6) A resin sheet that has been melted and formed into a sheet at a temperature higher than the melting point of the highest melting point resin in a mixture of two or more resins is controlled to a temperature higher than the melting point of the resin skin material, and the resin skin material is spread on the surface of the resin sheet. The resin sheet is woven to promote interfacial fusion of the resin skin material to the resin sheet by the retained heat of the resin sheet, and the resin sheet for interfacial fusion of the resin skin material is radiated from the surface opposite to the interfacial fusion surface. Laminated resin press molding characterized by controlling the temperature of the resin sheet to maintain it in a temperature decreasing range from the melting point of the lowest melting point resin to around the solidifying point, and after temperature control, inserting it into a mold to perform press molding. method of manufacturing the product.