JP6283941B2 - Manufacturing method of molded products - Google Patents

Description

  The present invention relates to a method for producing a fiber-reinforced molded product used for a structural member.

  For structural members, it is necessary to select the material and thickness appropriately according to the strength requirements, but in areas where there is a high demand for weight reduction, partial reinforcement is often effective to save unnecessary weight. . For example, when a structure is manufactured by sheet metal welding, weight reduction may be achieved by welding more detailed parts to reinforce only necessary portions.

  On the other hand, in the case of a resin molded product with a high degree of freedom of shape, partial reinforcement such as uneven thickness and rib reinforcement is easy, but since the strength of the original material is low, it is necessary to further increase the strength. It has been. For structural members that require weight reduction, partial reinforcement has been devised, and demand is particularly high in the fields of personal computers, home appliances, medical equipment, automobile parts, etc. that are effective in increasing strength with resin materials. .

  Conventionally, in the case of a resin product that requires high strength, it is generally manufactured by performing injection molding, press molding, or the like using a material in which reinforcing fibers such as glass and carbon are combined. Since the reinforcing fiber used in these materials has a higher impact property of the composite material as the fiber length is longer, continuous reinforcing fiber may be used particularly in a high-strength field replacing metal. However, the molding and processing using continuous reinforcing fibers has a problem that since the degree of freedom of deformation is lower than that of discontinuous short fiber reinforcing materials, it cannot be formed in a single process and productivity is low.

  Therefore, a material in which a continuous fiber reinforced material is impregnated with resin in advance (hereinafter referred to as a reinforcing sheet) is used as a reinforcing material, and this reinforcing sheet is placed in a mold and partially reinforced by injection or compression molding with a resin material. The method of obtaining the molded product of has been taken. However, there are many problems such as fixing and positioning of the reinforcing sheet, and there is no effective method. In the case of injection molding, since a high injection pressure is applied to the insert (reinforcing material disposed in the mold), the insert may be deformed, damaged, misaligned, etc. unless it is sufficiently fixed. For this reason, as a method for fixing the insert, Patent Document 1 discloses a method in which a protruding shape is provided in advance in the insert and the insert is fixed in a concave shape provided in the mold.

JP 2012-86556 A Japanese Patent Laying-Open No. 2005-161541 JP 2013-6389 A

  However, in this method, there is a problem that a projecting shape partially remains as a product or a hole shape remains, and many uses impede the degree of freedom of the product shape and are not practical. In Patent Document 2, it is disclosed that the mold surfaces are fixed in close contact with both mold surfaces to be opened and closed, but this makes it difficult to flow a molding material other than the reinforcing sheet in the thickness direction. As a result, the degree of freedom of the product shape is still insufficient.

  In these problems, injection compression molding that can keep the resin pressure lower is considered effective, but on the other hand, when the molding resin flows in the compression process, a sufficient gap with the reinforcing sheet must be secured. There is a problem. In the method shown in Patent Document 3, in the case of a small and simple surface shape, the low-pressure resin flow is not hindered, but the shape is large or the concavo-convex shape is large and the reinforcing sheet does not fit into the mold shape accurately. In such a case, there are problems that block the flow path at many places to increase the flow resistance and make the molding unstable.

  In the above example, when viewed in the thickness direction of the molded product, the reinforcing sheet is shifted to one side. In other words, the reinforcing sheet is exposed on one side of the reinforced part of the molded product, which causes a problem when it is desired to set the appearance surface even if partially. The surface exposure of this reinforcing sheet is also a problem of the prior art.

  An object of the present invention is to provide a method for producing a molded product that satisfies both the degree of freedom in shape and appearance, and high strength and light weight.

The present invention relates to the following.
(1) A reinforcing sheet formed by impregnating a thermoplastic resin A into a cloth made of reinforcing fibers is inserted into a molding die, and then a thermoplastic resin B is injected into the molding die as a molding resin. In the manufacturing method of the molded product integrated through the molded product, the reinforcing sheet has a thick part and a thin part, and the thickness of the thick part is approximately the same as the thickness of the molded product. Manufacturing method.
(2) The method for producing a molded product according to (1), wherein a through-hole is provided in a thin portion of the reinforcing sheet.
(3) After a part of the reinforcing sheet is sandwiched and fixed by a movable member provided so as to be capable of being pressed against at least one of the molding dies, the thermoplastic resin B is injected as a molding resin (1) ) Or (2).
(4) The method for producing a molded article according to (2) or (3), wherein the cloth is made of a woven weave of reinforcing fibers and has an open space having a diameter of 3 mm or more.
(5) The method for producing a molded article according to any one of (1) to (4), wherein the thermoplastic resin A which is an impregnating resin of the reinforcing sheet and the thermoplastic resin B which is a molding resin have compatibility.
(6) The main component of the thermoplastic resin A which is an impregnating resin of the reinforcing sheet is a polypropylene resin, and the thermoplastic resin B which is a molding resin is a composite material including a polypropylene resin and glass reinforced fibers. Manufacturing method of molded products.

  According to the present invention, it is possible to provide a method for producing a molded product that can satisfy both the degree of freedom in shape and appearance, and high strength and light weight.

It is a schematic diagram which shows the injection compression molding which uses the reinforcement sheet | seat with a thick part which concerns on this invention. It is a schematic diagram which shows the injection compression molding which uses the conventional reinforcement sheet. It is a schematic diagram which shows the injection compression molding which uses the reinforcement sheet | seat with a through-hole which concerns on this invention. It is a schematic diagram which shows injection compression molding using the movable pin for press-contact fixation which concerns on this invention. 3 is a schematic diagram showing a reinforcing sheet used in Example 1. FIG. 2 is a schematic cross-sectional view showing injection compression molding of Example 1. FIG. 6 is a schematic diagram showing a reinforcing sheet used in Example 2. FIG. 6 is a schematic cross-sectional view showing injection compression molding of Example 2. FIG. 6 is a schematic cross-sectional view showing injection compression molding of Comparative Example 1. FIG.

Embodiments of the present invention will be described below.
In the present embodiment, a reinforcing sheet formed by impregnating a thermoplastic resin A into a cloth made of reinforcing fibers is inserted into a molding die, and then a thermoplastic resin B is injected into the molding die as a molding resin. In the manufacturing method of the molded product integrated through the compression step, the reinforcing sheet has a thick portion and a thin portion, and the thickness of the thick portion is approximately the same as the thickness of the molded product. It is a manufacturing method of a molded article. The thin-walled portion of the reinforcing sheet is a portion other than the thick-walled portion and is the majority of the reinforcing sheet. The thick-walled portion is a portion thicker than the thin-walled portion in the thickness direction of the reinforcing sheet.

  The reinforcing fiber to be used reinforces the resin molded body, and the material is not particularly limited. One that can be made into a cross shape by weaving and knitting in a fiber-like single wire or bundle state is used. Specifically, in addition to glass fiber, carbon fiber, and metal fiber, a resin material can also be used. In the case of a resin fiber, any resin fiber may be used as long as it provides a reinforcing effect without melting and deterioration at the melting temperature of the thermoplastic resin to be impregnated. Is possible. The fiber diameter is not particularly limited.

The cloth made of these fibers is woven or knitted with reinforcing fibers to be used, and the mass per unit area is determined by the amount of fibers used, and the reinforcing effect also changes. In general, the mass per unit area (kg / m ² ) is expressed as a basis weight, but by selecting this, the required strength and mass can be handled. Therefore, the cross basis weight, preferably ^{50~1000g / m 2, 200~800g / m} 2 is more preferable. Moreover, the cloth has an open gap, and the diameter is preferably 3 mm or more, and is preferably selected depending on the required strength and the product size.

  Next, as the cloth impregnating resin, a thermoplastic resin is used in this embodiment. In order to achieve the desired shape flexibility of the molded product, it is preferable to use a thermoplastic resin that is not only high in design freedom but also advantageous in cost as a molding material. As is apparent from actual home appliances and automobile parts, thermoplastic resins are used in most molded products having shapes. In the present embodiment, the molding material is a thermoplastic resin, and the impregnation resin of the reinforcing sheet is preferably the same thermoplastic resin because it preferably has the same thermal characteristics as the molding resin (injection resin). Further, since the impregnating resin of the reinforcing sheet is a thermoplastic resin, there is an advantage that it has flexibility due to heat at the time of molding and adheres to the mold by the resin pressure of the molding resin to improve transferability. The resin is not particularly limited as long as it is a thermoplastic resin. On the other hand, since the linear expansion coefficient is different between the reinforcing sheet portion and the molded resin portion, so-called thermal stress is generated at the time of molding shrinkage or in the expansion / shrinkage behavior in the environment. For this reason, since there exists a problem which a big deformation | transformation and a crack generate | occur | produce depending on the elongation characteristic of resin, it is preferable to use the material (composite material) which combined the glass reinforced fiber as molding resin (injection resin). In this case, in the material (composite material) which is a molding resin (injection resin), the glass reinforcing fiber content (glass content) is preferably 10 to 70% by mass. Furthermore, 20-40 mass% is more preferable.

  The molding according to the present embodiment is a process in which a reinforcing sheet is inserted into a molding die, and after molding resin is injected, a molding process is completed by a compression process. For this reason, it is preferable that the mold is in a state of being retracted from the mold clamping completion position at the time of injection, and the product terminal portion is provided with a biting structure or a pressure movable butting block. The purpose of this injection compression is to reduce the pressure of the injection resin and prevent breakage and movement of the reinforcing sheet. Although depending on the molding shape and the number of gate points, the resin pressure is preferably 10 MPa or less. As for the compression process after injection, the longer the stroke, the higher the expected pressure flow, the lower the injection pressure, but the longer the flow length or the lowering of the resin temperature requires an appropriate selection. Therefore, in this embodiment, it is preferable that a compression stroke shall be 3-15 mm. In addition, the compression process is preferably electrically driven in order to prevent the resin pressure from increasing as the pressurization timing and speed after injection increases.

  The reinforcing sheet used is partially provided with a thick portion. This thick portion can serve as a spacer for maintaining the position of the reinforcing sheet in the thickness direction of the molded product and can also be used for positioning, and can control the resin flow during compression. Moreover, the thickness of the thick part provided in the reinforcing sheet is substantially the same as the thickness of the molded product to be manufactured. For example, when the thickness of the molded product is 100%, the thickness of the thick portion is 80 to 110%.

  It is effective to provide this thick part at the stage of manufacturing the reinforcing sheet. For example, in the step of press-impregnating a reinforcing fiber cloth with a thermoplastic resin, a thick-walled portion shape is prepared on the pressing surface, and the thick-walled portion is formed simultaneously with the impregnation. However, when the shape is complicated, partial pre-shaping is required, and therefore it is effective to form a thick portion in this pre-shaping step. It is preferable to provide a thick part on the reinforcing sheet by any method, and the shape of the thick part can be arbitrarily set to be a rib shape or a round pin shape, but the shape does not unnecessarily hinder the resin flow during pressurization. preferable.

  The fixing of the reinforcing sheet to the mold may be supported by providing a hole in a part of the reinforcing sheet with respect to the pin provided in the mold, or provided in a portion corresponding to the rib of the molded product. You may respond by inserting a thick part in a type | mold. Thus, it is preferable to use the product shape so as not to disturb the product appearance as much as possible.

  As shown in FIG. 1 (a), the reinforcing sheet 1 is inserted (installed) into the molding dies 4 and 5, clamped to a predetermined position, and the molding resin 3 is injected. 4 and 5 are pressed against the opposing surface of the injection gate 6 by the molding resin (injection resin) 3, but are partially restricted by the thick portion 2. That is, a minimum space can be secured between the reinforcing sheet 1 and the molds 4 and 5 by the positional relationship between the thick portion 2 of the reinforcing sheet 1 and the reinforcing sheet 1. For this reason, when the molding resin 3 flows in the subsequent compression step, it is possible to prevent the flow path from being blocked by the deformation of the reinforcing sheet 1.

  FIGS. 1A and 1B show schematic diagrams of steps when the reinforcing sheet 1 has the thick portion 2 and FIGS. 2A and 2B show the steps when the reinforcing sheet 1 does not have the thick portion 2. FIG. . When the reinforcing sheet 1 does not have the thick portion 2, the resin flow of the molding resin 3 due to the pressurization in the compression process proceeds while pushing the reinforcing sheet 1, whereas the reinforcing sheet 1 as in the present embodiment. When the thick portion 2 is present, the reinforcing sheet 1 moves to a predetermined position by itself at the same time as clamping. Therefore, the flow resistance varies greatly depending on the presence or absence of the thick portion 2.

  Conventionally, due to this flow resistance, the end of the molded product tends to be unstable at the same time as insufficient filling 13 and insufficient transferability as shown in FIG. 2 (b). Can be stabilized to eliminate. And in this embodiment, as shown in FIG. 1, since the thickness part 2 height of the reinforcement sheet 1 is set to the substantially same dimension as the height of a molded article, it is stable when the compression process is completed. The position in the thickness direction of the reinforcing sheet 1 can be secured. Although a pin gate that is straight in the clamping direction is shown here, the same effect can be obtained if a flow path can be secured even with a side gate or the like.

  The thick portion 2 of the reinforcing sheet 1 can secure a space on the opposing surface of the injection gate 6 depending on the setting, but in this case, the molding resin 3 needs to penetrate the reinforcing sheet 1, and FIG. It is preferable that the through-hole (through-hole) 7 is provided in the thin part 14 of the reinforcing sheet 1 as shown in FIG.

  The schematic diagram of a manufacturing process is shown to Fig.3 (a), (b). The through-hole (through-hole) 7 is preferably formed at the same time in the thick-walled portion 2 forming step or the like, but it is preferable that the cloth has an opening in the cloth beforehand. It is preferable that the voids 7 can be present, and further, it is preferable that the through holes (through voids) 7 are not easily deformed by resin pressure or the like. The diameter of the through hole (through space) 7 of the reinforcing sheet 1 is preferably 3 mm or more. When the diameter of the through-hole (through-hole) 7 is 3 mm or more, the molding resin 3 can smoothly penetrate the reinforcing sheet 1, the molding resin 3 is uniformly filled, and the molding has excellent appearance and strength. Goods can be obtained.

  Therefore, the cloth weave is entangled weave, and the cloth is more preferably one having a gap of 3 mm or more in diameter. When the opening gap of the cloth has a diameter of 3 mm or more, it is possible to obtain the reinforcing sheet 1 having a through-hole (through-hole) 7 having a diameter of 3 mm or more.

In addition, as shown in FIG. 4, in this embodiment, a part of the reinforcing sheet 1 is nipped and fixed by a movable member (moving pin for pressure contact fixing) 8 provided so as to be able to press contact with at least one of the molding dies. It is preferable to inject a thermoplastic resin, which is the molding resin 3, after reaching the state. As a part of the reinforcing sheet 1, the thick portion 2 may be used.
A pin or block-shaped member that is movable in the direction perpendicular to the die is provided at a position where it abuts a part of the reinforcing sheet 1 and is reinforced before the injection of the molding resin 3 starts in a mold-clamped state that leaves the compression process. A part of the sheet 1 is clamped and fixed, and it is movable in accordance with the mold operation even in the compression process, so that it can be continuously fixed.

  4 (a) and 4 (b) show schematic views of the manufacturing process. Although this movable and pressure-contactable member can be provided with an actuating device behind the member, it is preferable to control the pressing by appropriately setting a spring (spring structure) 9 as the actuating device. Further, this movable and pressure-contactable member (for example, a pressure pin for fixing the movable pin) may be provided on either one of the core side 4 and the cavity side 5 of the mold. Thereby, the molding resin 3 is not covered on the thick portion 2 serving as a spacer, and the reinforcing sheet 1 can be more stably secured in the injection and compression process. The portion (part) of the reinforcing sheet that is nipped and fixed by the movable and press-contactable member is not particularly limited as long as it is a press-contactable portion, but the portion that contacts the thick portion 2 Is preferably provided.

  As shown in FIG. 5, the reinforcing sheet 1 may be provided with a through hole (positioning hole) 10 in order to be fitted to a convex portion provided in a part of the mold. As shown in FIG. 6, the convex part provided in a part of the mold is, for example, a positioning movable pin 11 and can be operated by a spring (spring structure) 9 or the like. The positioning movable pins 11 may be provided on either one of the core side 4 and the cavity side 5 of the mold. By moving the positioning movable pin 11 into the through hole (positioning hole) 10 of the reinforcing sheet 1, the movement of the reinforcing sheet 1 in the surface direction can be restricted.

As shown in FIG. 7, the reinforcing sheet 1 may be provided with both the positioning hole 10 and the through gap 7.
As shown in FIG. 8, even if a mold having an inclined portion 15 is used, the reinforcing sheet 1 is fitted into the through hole (positioning hole) 10 of the reinforcing sheet 1, thereby reinforcing the reinforcing sheet. 1 can be regulated, and the reinforcing sheet 1 can be injected and compressed more stably by sandwiching and fixing the thick portion 2 of the reinforcing sheet 1 with the movable pin 8 for press contact fixing. The position can be secured in the process, and the presence of the through-hole 7 allows the molding resin 3 to smoothly penetrate the reinforcing sheet 1 and the molding resin 3 to be uniformly filled, thereby obtaining a molded product having excellent appearance and strength. be able to. The reinforcing sheet 1 is not exposed on the surface of the molded product, and can be molded stably with good reproducibility.

  Next, in this embodiment, it is preferable that the thermoplastic resin A that is the impregnating resin of the reinforcing sheet and the thermoplastic resin B that is the molding resin have compatibility. The impregnating resin and the molding resin are not particularly limited as long as they are thermoplastic resins, but it is important in terms of strength and environmental reliability that they are in close contact with each other. Therefore, for example, if the impregnating resin is a polyamide, a polyamide material compatible with this is preferable as the molding resin. This combination is not particularly limited as long as it is compatible.

The thermoplastic resin A which is an impregnating resin for the reinforcing sheet is not particularly limited, but a polypropylene resin is preferable, and a modified polypropylene resin obtained by reacting with an alkylphenol resin is more preferable. As thermoplastic resin A, what has a polypropylene resin as a main component is good.
The modified polypropylene resin is obtained by reacting a polypropylene resin and an alkylphenol resin in the presence of a radical initiator.

  The polypropylene resin used is a polymer of propylene, but in the present invention, a copolymer with another monomer is also included. Examples of the polypropylene resin include homopolypropylene, a block copolymer of propylene, ethylene, and an α olefin having 4 to 10 carbon atoms (also referred to as “block polypropylene”), propylene, ethylene, and an α olefin having 4 to 10 carbon atoms. Random copolymers (also referred to as “random polypropylene”). The combination of “block polypropylene” and “random polypropylene” is also referred to as “polypropylene copolymer”.

  In the present invention, one or more of the above-mentioned homopolypropylene, block polypropylene, and random polypropylene may be used as the polypropylene resin. Among these, block polypropylene is preferable as the polypropylene resin.

  The alkylphenol resin used refers to a novolac type phenol resin or a resol type phenol resin. The novolak-type phenol resin in the present invention is a resin obtained by condensing phenols and aldehydes under an acid catalyst. The resol type phenol resin refers to a resin obtained by condensing phenols and aldehydes under an alkali catalyst. The novolac type phenol resin and the resol type phenol resin may be used alone or in combination.

  The thermoplastic resin B which is a molding resin is preferably a composite material including a polypropylene resin and glass reinforced fibers. Examples of the glass reinforced fiber include chopped glass fiber, roving glass fiber, and glass bubbles. Examples of the composite material include GFPP (glass fiber reinforcement plastic) obtained by kneading the glass reinforced fiber and polypropylene resin. .

  The method for producing a resin molded product of the present invention can be generally applied to home appliances, medical devices, automobile parts, etc., but these are preferably low-cost. In the present invention, it is preferable to apply a polypropylene resin, which is inexpensive and has good chemical resistance and is already widely used, to the impregnation resin and molding resin of the reinforcing sheet. Furthermore, glass fiber in which reinforcing fibers are widely used is preferable.

EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to this.
Example 1
As the cloth made of reinforcing fibers, a cloth having a glass fiber diameter of 17 μm and 2,000 strands was used, and a cloth woven in a plain weight of 400 g / m ² was used. A modified polypropylene resin obtained by reacting a polypropylene resin and an alkylphenol resin in the presence of a radical initiator was used as the thermoplastic resin as the impregnating resin.
The impregnation press was a 30-ton hot press molding machine, and the glass cloth and the modified polypropylene resin were overlapped at 220 ° C. for 5 minutes under a surface pressure of 0.1 to 5 MPa to prepare a reinforcing sheet. At this time, thick portions having a diameter of 6 mm and a thickness of 3 mm were provided with a press die at a pitch of 100 mm. The produced reinforcing sheet was set in a molding die having an inclined portion with a gradient of 15 degrees to produce a molded product.

  The reinforcing sheet was fitted with a through-hole (positioning hole) provided in a convex part provided in a part of the mold to restrict movement in the surface direction. As the molding resin, GFPP (glass fiber reinforcement plastic) obtained by kneading 30% by mass of chopped glass fiber with the modified polypropylene resin was used. Although the reinforcement sheet was exposed on one side, the position of the reinforcement sheet was stable and could be molded with good reproducibility. The reinforcing sheet is shown in FIG. 5, and the cross section of the molding process is shown in FIG.

(Example 2)
As the cloth made of reinforcing fibers, a cloth using a strand having a glass fiber diameter of 17 μm and a number of 2000 strands entangled with a basis weight of 400 g / m ² was used (cross opening gap of the cloth; diameter 3 mm). A modified polypropylene resin obtained by reacting a polypropylene resin and an alkylphenol resin in the presence of a radical initiator was used as the thermoplastic resin as the impregnating resin.
The impregnation resin was impregnated by passing a glass cloth and a modified polypropylene resin film at a rate of 0.5 m / min between 220 ° C. hot rolls at a pressure of 1 to 10 MPa. Next, thick portions having a diameter of 6 mm and a thickness of 3 mm were provided on the reinforcing sheet at a pitch of 100 mm by a 30-ton hot press molding machine. The reinforcing sheet is provided with a through gap having a diameter of 3 to 4 mm. This was set in a molding die having an inclined portion with a gradient of 15 degrees to produce a molded product.

The position restriction is the same as in the first embodiment. Molding resin was injected from the core side with the movable pin provided in the mold while being pressed and clamped from the core side to the cavity side, and then molded through compression. The same GFPP as in Example 1 was used as the molding resin.
Although the arrangement shown in FIG. 8 was adopted, the reinforcing sheet was not exposed on the surface of the molded product and could be molded stably and with good reproducibility. The reinforcing sheet is shown in FIG. 7, and the cross section of the molding process is shown in FIG.

(Comparative Example 1)
As the cloth made of reinforcing fibers, a cloth having a glass fiber diameter of 17 μm and 2,000 strands was used, and a cloth woven in a plain weight of 400 g / m ² was used. A modified polypropylene resin obtained by reacting a polypropylene resin and an alkylphenol resin in the presence of a radical initiator was used as the thermoplastic resin as the impregnating resin.
The impregnation press was a 30-ton hot press molding machine, and the glass cloth and the modified polypropylene resin were overlapped at 220 ° C. for 5 minutes under a surface pressure of 0.1 to 5 MPa to prepare a reinforcing sheet. No thick part is provided.
This was set in a molding die having an inclined portion with a gradient of 15 degrees and molded. The reinforcing sheet was fitted with a through-hole (positioning hole) provided in a convex part provided in a part of the mold to restrict movement in the surface direction. As the molding resin, GFPP in which the modified polypropylene resin was kneaded with chopped glass fibers was used.
FIG. 9 shows a cross section of the molding process. Although the reinforcing sheet 1 is set to be exposed on one side of the molded product, a defective resin cover 12 is generated at the corner, and the reinforcing sheet 1 is unexpectedly exposed on the opposite side.

  By using the manufacturing method according to the present invention, it becomes possible to arbitrarily avoid the low degree of freedom of shape and the surface exposure of the reinforcing sheet as in the prior art, it is possible to obtain a stable high-strength and lightweight molded product, Applicable to many product fields.

1: Reinforcing sheet, 2: Thick part, 3: Molding resin (injection resin), 4: Mold (core side), 5: Mold (cavity side), 6: Injection gate, 7: Through gap or through hole , 8: movable member or movable pin for pressure contact fixing, 9: spring or spring structure, 10: through hole or positioning hole, 11: movable pin for positioning, 12: resin cover, 13: insufficient filling, 14: thin portion, 15: Inclined part of the mold.

Claims (6)

A reinforcing sheet made by impregnating a thermoplastic resin A into a cloth made of reinforcing fibers is inserted into a molding die, and then a thermoplastic resin B as a molding resin is injected into the molding die and further integrated through a compression process. In the method for manufacturing a molded product, the reinforcing sheet has a thick portion and a thin portion, and the thickness of the thick portion is the same as the thickness of the molded product.   The method for producing a molded product according to claim 1, wherein a through-hole is provided in the thin portion of the reinforcing sheet. The thermoplastic resin B is injected as a molding resin after a part of the reinforcing sheet is sandwiched and fixed by a movable member that can be pressed against at least one of the molding dies.
Or the manufacturing method of the molded article of 2. The method for producing a molded product according to claim 2 or 3, wherein the cloth is made of a woven weave of reinforcing fibers and has an open space having a diameter of 3 mm or more. A thermoplastic resin A that is an impregnating resin of the reinforcing sheet, and a thermoplastic resin B that is a molding resin,
The manufacturing method of the molded article in any one of Claims 1-4 which has compatibility. 6. The molded article according to claim 5, wherein the main component of the thermoplastic resin A which is an impregnating resin of the reinforcing sheet is a polypropylene resin, and the thermoplastic resin B which is a molding resin is a composite material including a polypropylene resin and glass reinforcing fibers. Production method.

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