JP2015003504A - Molding and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding which has a protrusion part formed on a fiber-reinforced thermoplastic resin layer and having high strength and is easy to produce and its production method.SOLUTION: A molding 1 includes a substrate part 12 composed of a thermoplastic resin, fiber-reinforced thermoplastic resin layers 14 and 16 arranged on both surfaces of the substrate part 12 and a protrusion part 18 formed on the fiber-reinforced thermoplastic resin layer 14, and the protrusion part 18 is formed by causing a part of the thermoplastic resin which is arranged on the side of the substrate part 12 of the fiber-reinforced thermoplastic resin layer 14 and constitutes the substrate part 12 and the protrusion part 18 to flow to the front side of the fiber-reinforced thermoplastic resin layer 14.

Description

  The present invention relates to a molded article and a manufacturing method thereof.

In various fields such as aircraft and automobiles, molded products using fiber reinforced thermoplastic resins made of reinforced fibers and thermoplastic resins are widely used. For example, the molded product shown below is mentioned.
(I) Molded product in which a thermoplastic resin is injection-molded and bonded and integrated onto the surface of a carbon fiber composite material plate obtained by heating and pressing a prepreg impregnated with a thermosetting resin and a thermoplastic resin in carbon fiber (patented) Reference 1).
(Ii) An insole (patented) in which a sheet-shaped molding material in which fiber-reinforced thermoplastic resin layers are arranged on both sides of a thermoplastic resin layer is heat-molded so that the surface shape matches the shape of the user's sole with a mold Reference 2).

By the way, in the case of a sheet-like molded article having a surface fiber reinforced thermoplastic resin layer used for an aircraft or an automobile, the surface of the fiber reinforced thermoplastic resin layer is made of a thermoplastic resin for the purpose of increasing the strength. Projections such as ribs and bosses are often formed.
As a method for producing a molded product having such a protrusion, for example, a thermoplastic resin is injection-molded on the surface of a molded product having a fiber-reinforced thermoplastic resin layer on the surface layer, as in the production of a molded product (i). And a method of forming protrusions such as ribs and bosses. However, this method is complicated to manufacture because it is necessary to separately perform molding of the molded body having the fiber-reinforced thermoplastic resin layer and injection molding of the protrusions. In addition, in this method, it may be difficult to obtain sufficient strength of the protrusions in the obtained molded product.
Moreover, since the manufacturing method of a molded product (ii) is only press-molded so that the surface shape of the sheet-shaped molding material becomes a desired shape, a molded product having protrusions such as ribs and bosses on the surface I can't get it.

Japanese Patent No. 3098478 US Pat. No. 4,778,717

  The present invention provides a molded product in which a protrusion is formed on a fiber-reinforced thermoplastic resin layer, which is easy to manufacture and has a high strength of the protrusion, and a method for manufacturing the molded product.

  The molded article of the present invention has a thermoplastic resin molded body having a base portion and a protruding portion protruding from the base portion, and a fiber-reinforced thermoplastic resin layer disposed on at least a part of the surface of the base portion. The protruding portion protrudes through the fiber reinforced thermoplastic resin layer.

In the molded article of the present invention, it is preferable that the base portion is in a sheet form, and the fiber reinforced thermoplastic resin layers are respectively disposed on both sides of the base portion.
In the molded article of the present invention, it is preferable that the reinforcing fiber forming the fiber-reinforced thermoplastic resin layer is a long fiber.

  In the method for producing a molded article of the present invention, a molding material in which a fiber reinforced thermoplastic resin layer is disposed on at least a part of the surface of the thermoplastic resin body used for forming the thermoplastic resin molded body is molded by a mold. In this method, a part of the thermoplastic resin body is caused to flow toward the surface side of the fiber reinforced thermoplastic resin layer to form the protrusions.

In the method for producing a molded article according to the present invention, the molding material is preferably a molding material in which fiber-reinforced thermoplastic resin layers are disposed on both sides of a sheet-like thermoplastic resin body.
Moreover, in the manufacturing method of the molded article of this invention, it is preferable that the reinforced fiber which forms the said fiber reinforced thermoplastic resin layer is a long fiber.

The molded product of the present invention is a molded product in which a protruding portion is formed on a fiber reinforced thermoplastic resin layer, is easy to manufacture, and has a high strength of the protruding portion.
According to the method for producing a molded product of the present invention, a molded product with a high strength of the protrusion can be obtained easily.

It is the perspective view which showed an example of the molded article of this invention. It is AA sectional drawing of the molded article of FIG. It is sectional drawing which showed the molding material used for manufacture of the molded article of FIG. It is sectional drawing which showed an example of the metal mold | die used for manufacture of the molded article of this invention. It is sectional drawing which showed the shaping | molding process in the manufacturing method of the molded article of FIG. It is sectional drawing which showed the shaping | molding process in the manufacturing method of the molded article of FIG.

<Molded product>
Hereinafter, an example of the molded product of the present invention will be shown and described in detail.
As shown in FIGS. 1 and 2, the molded product 1 according to the present embodiment includes both a thermoplastic resin molded body 10 having a sheet-like base portion 12 and a protruding portion 14 protruding from the base portion 12, and the base portion 12. Fiber reinforced thermoplastic resin layers 16 and 18 respectively disposed on the surface of the fiber.

The thermoplastic resin molded body 10 is a molded body formed of a thermoplastic resin, and four protrusions 14 are formed on the surface of the sheet-like base portion 12 on the side where the fiber reinforced thermoplastic resin layer 16 is disposed. ing.
The protruding portion 14 is formed so as to protrude through the fiber reinforced thermoplastic resin layer 16 disposed on the surface of the base portion 12. In a portion buried in the fiber reinforced thermoplastic resin layer 16 on the base end side of the protrusion 14, the thermoplastic resin forming the protrusion 14, the reinforcing fiber forming the fiber reinforced thermoplastic resin layer 16, and the thermoplastic resin. Resin is mixed.

  In the molded product 1, the protrusions 14 of the thermoplastic resin molded body 10 are formed so as to protrude through the fiber reinforced thermoplastic resin layer 16, so that the manufacturing is simple as will be described later. In addition, since the base portion 12 and the projection portion 14 are an integrated thermoplastic resin molded body 10, the projection portion is formed independently, such as when the projection portion is formed by injection molding on the fiber reinforced thermoplastic resin layer. Compared to this, the strength of the protrusion 14 is high.

Although the shape of the base | substrate part 12 is a rectangle in this example, it is not limited to a rectangle.
The thickness of the base portion 12 is not particularly limited, but is preferably 0.3 to 10.0 mm, and more preferably 0.5 to 3.5 mm. If the thickness of the base portion 12 is equal to or greater than the lower limit value, high strength is easily obtained. If the thickness of the base portion 12 is equal to or less than the upper limit value, a molded body excellent in bending specific strength can be easily obtained.

Examples of the protrusion 14 include a rib and a boss.
The shape of the protrusion 14 is substantially conical in this example, but is not particularly limited. The shape of the protruding portion 14 may be a columnar shape, a quadrangular rectangular cross section, a triangular shape, or the like, and may be determined as appropriate according to the use of the protruding portion 14. Further, the height of the protrusion 14 is not particularly limited, and may be determined as appropriate according to the use of the protrusion 14.
Moreover, although the number of the protrusion parts 14 is four in this example, three or less may be sufficient and five or more may be sufficient.

The thermoplastic resin forming the thermoplastic resin molding 10 is not particularly limited, and examples thereof include polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, etc.), polystyrene, ABS resin, acrylic resin. , Vinyl chloride, polyamide (polyamide 6 etc.), polycarbonate, polyphenylene ether, polyether sulfone, polysulfone, polyetherimide, polyketone, polyether ketone, polyether ether ketone and the like. As the thermoplastic resin, modified products of these resins may be used.
As a thermoplastic resin which forms the thermoplastic resin molding 10, polyolefin, polyamide, and polycarbonate are preferable, and polypropylene and polyamide 6 are more preferable.

The thermoplastic resin forming the thermoplastic resin molded body 10 may be one type or two or more types.
In addition, various additives, fillers, colorants, and the like may be blended in the thermoplastic resin forming the thermoplastic resin molded body 10.

The fiber reinforced thermoplastic resin layer 16 is a layer formed of a fiber reinforced thermoplastic resin in which a reinforced fiber is impregnated with a thermoplastic resin. In this example, the fiber-reinforced thermoplastic resin layer 16 is disposed so as to cover the entire one surface of the base portion 12.
In the present invention, the fiber reinforced thermoplastic resin layer may be partially disposed on the surface of the base portion as long as the effects of the present invention are not impaired.

As a thermoplastic resin which forms the fiber reinforced thermoplastic resin layer 16, the same thing as what was mentioned as a thermoplastic resin which forms the thermoplastic resin molding 10 is mentioned, for example.
As a thermoplastic resin which forms the fiber reinforced thermoplastic resin layer 16, polyolefin, polyamide, and polycarbonate are preferable, and acid-modified polypropylene and polyamide 6 are more preferable. By using a preferable thermoplastic resin, when carbon fiber is used as the reinforcing fiber, the interface strength between the thermoplastic resin and the fiber can be further increased, and the strength of the molded body is further increased.

The thermoplastic resin that forms the fiber reinforced thermoplastic resin layer 16 may be one type or two or more types.
Various additives, fillers, colorants, and the like may be blended in the thermoplastic resin that forms the fiber-reinforced thermoplastic resin layer 16.
Further, the thermoplastic resin that forms the fiber-reinforced thermoplastic resin layer 16 may be the same as or different from the thermoplastic resin that forms the thermoplastic resin molded body 10.

  Examples of the reinforcing fibers that form the fiber-reinforced thermoplastic resin layer 16 include glass fibers, carbon fibers, and aramid fibers.

The reinforcing fibers forming the fiber reinforced thermoplastic resin layer 16 are preferably long fibers. In particular, it is preferable that the reinforcing fibers are continuous long fibers that are not interrupted in the fiber-reinforced thermoplastic resin layer 16. If the reinforcing fiber is a long fiber, a molded product with higher strength can be easily obtained.
Examples of the fiber reinforced thermoplastic resin layer 16 in which the reinforcing fibers are long fibers include a sheet in which a long fiber aligned in one direction is impregnated with a thermoplastic resin, and a laminate in which two or more sheets are laminated. Can be mentioned. When two or more sheets are laminated, the directions of the long fibers of each sheet may intersect or may be parallel.

The fiber reinforced thermoplastic resin layer 16 is a cloth material obtained by weaving a tape-like material in which long fibers are aligned in one direction and impregnated with a thermoplastic resin, and a cloth in which a reinforced fiber fabric is impregnated with a thermoplastic resin. You may form with a material etc.
Examples of the weave of the cloth material include plain weave, twill weave, satin weave, and triaxial weave.

Further, the reinforced fibers used for the fiber reinforced thermoplastic resin layer 16 may be chopped short fibers. For example, the fiber reinforced thermoplastic resin layer 16 may be formed of a sheet in which short fibers are opened one by one or dispersed in a bundle in a thermoplastic resin.
Alternatively, the fiber reinforced thermoplastic resin layer 16 may be formed of a sheet in which a long fiber is impregnated with a thermoplastic resin in which short fibers are opened individually or in a bundle.

  20-60% is preferable and, as for the volume content rate of the reinforced fiber in the fiber reinforced thermoplastic resin layer 16, 30-50% is more preferable. If the volume content of the reinforcing fiber is equal to or higher than the lower limit value, a molded product having high strength is easily obtained. If the volume content of the reinforcing fiber is equal to or less than the upper limit value, the thermoplastic resin easily passes through the fiber-reinforced thermoplastic resin layer 16 during molding, which will be described later, and the protrusions 14 are easily formed stably. .

  The thickness of the fiber reinforced thermoplastic resin layer 16 is preferably 0.1 to 1.0 mm, and more preferably 0.2 to 0.6 mm. If the thickness of the fiber reinforced thermoplastic resin layer 16 is equal to or greater than the lower limit value, a molded product having high strength is easily obtained. If the thickness of the fiber reinforced thermoplastic resin layer 16 is equal to or less than the upper limit value, the thermoplastic resin easily passes through the fiber reinforced thermoplastic resin layer 16 during molding, which will be described later, and the protrusions 14 are stably formed. It becomes easy to do.

Examples of the thermoplastic resin that forms the fiber-reinforced thermoplastic resin layer 18 include the same ones as those described for the thermoplastic resin molded body 10, and the preferred embodiment is the same as that for the fiber-reinforced thermoplastic resin layer 16. is there. Examples of the reinforcing fibers that form the fiber-reinforced thermoplastic resin layer 18 include the same fibers as those mentioned for the fiber-reinforced thermoplastic resin layer 16, and the preferred embodiments are also the same.
The thermoplastic resin in the fiber reinforced thermoplastic resin layer 18 may be the same as or different from the thermoplastic resin in the fiber reinforced thermoplastic resin layer 16.
The reinforcing fibers in the fiber reinforced thermoplastic resin layer 18 may be the same as or different from the reinforcing fibers in the fiber reinforced thermoplastic resin layer 16.

  20-60% is preferable and, as for the volume content rate of the reinforced fiber in the fiber reinforced thermoplastic resin layer 18, 30-50% is more preferable. If the volume content of the reinforcing fiber is equal to or higher than the lower limit value, a molded product having high strength is easily obtained. If the volume content of the reinforcing fibers is equal to or less than the upper limit value, a molded body excellent in bending specific strength can be easily obtained.

  The thickness of the fiber reinforced thermoplastic resin layer 18 is preferably 0.1 to 1.0 mm, and more preferably 0.2 to 0.6 mm. If the thickness of the fiber reinforced thermoplastic resin layer 18 is equal to or greater than the lower limit value, a molded product having high strength is easily obtained. If the thickness of the fiber reinforced thermoplastic resin layer 18 is equal to or less than the upper limit value, a molded body excellent in bending specific strength is easily obtained.

  In the molded product of the present invention described above, the base portion and the projection portion in the thermoplastic resin molded body are integrated, and the projection portion is formed so as to protrude through the fiber reinforced thermoplastic resin layer. The manufacture is simple and the strength of the protrusion is high.

The molded product of the present invention is not limited to the molded product 1 described above. For example, it may be a molded product in which the fiber reinforced thermoplastic resin layer is provided only on one side of the sheet-like base portion.
As the molded product of the present invention, when a sheet-like substrate portion is used, the molded product is not easily warped, and a fiber-reinforced thermoplastic resin layer is provided on each side of the substrate portion because higher strength is easily obtained. It is preferable. Moreover, when a fiber reinforced thermoplastic resin layer is provided on both surfaces of a sheet-like base | substrate part, the molded article in which the projection part was formed in both surfaces may be sufficient.
The molded product of the present invention may have a base portion having a shape other than a sheet shape.

<Method of manufacturing molded product>
Hereinafter, the manufacturing method of the molded product 1 will be described as an example of the manufacturing method of the molded product of the present invention. As a manufacturing method of the molded article 1, for example, a method having the following preheating step and molding step can be mentioned.
Preheating step: The molding material 1A in which the fiber reinforced thermoplastic resin layers 16 and 18 are respectively disposed on both surfaces of the sheet-like thermoplastic resin body 10A forming the thermoplastic resin molded body 10 illustrated in FIG. Preheating process.
Molding step: A preheated molding material 1A is molded by a mold 100 (FIG. 4) adjusted to a temperature lower than the preheating temperature of the molding material 1A, and a part of the thermoplastic resin body 10A is a fiber reinforced thermoplastic resin. A step of forming the protrusion 14 by flowing toward the surface side of the layer 16.

(Preheating process)
The thermoplastic resin body 10 </ b> A in the molding material 1 </ b> A forms the thermoplastic resin molded body 10 in the molded product 1. The thermoplastic resin body 10 </ b> A has a sheet shape and is thicker than the base portion 12 of the target molded product 1.
The reinforcing fibers forming the fiber-reinforced thermoplastic resin layer 16 in the molding material 1A are preferably long fibers from the viewpoint of strength. The same applies to the reinforcing fibers forming the fiber-reinforced thermoplastic resin layer 18.

A thermoplastic resin body 10A and a fiber reinforced thermoplastic resin layer 16 are laminated in this order on the fiber reinforced thermoplastic resin layer 18 to form a molding material 1A, and the molding material 1A is preheated by a heating device.
Any heating device may be used as long as it can preheat the molding material 1A to a desired temperature, and examples thereof include an infrared heating furnace, an electric oven, and a hot plate. Of these, an infrared heating furnace is preferable as the heating device. Thus, the method of heating the molding material 1A by infrared rays in the preheating step is advantageous in that the molding material 1A can be easily heated to the inside.

The preheating temperature varies depending on the type of thermoplastic resin used, but is preferably 150 to 450 ° C, and more preferably 210 to 250 ° C.
The preheating time may be appropriately determined depending on the thickness of the molding material 1A.

(Molding process)
As shown in FIG. 4, the mold 100 used in the molding process has a lower mold 110 and an upper mold 112. In the mold 100, a cavity 114 is formed inside by clamping the lower mold 110 and the upper mold 112. The shape of the cavity 114 is complementary to the shape of the molded product 1.
As shown in FIG. 5, the preheated molding material 1A is placed on the lower mold 110, the upper mold 112 is lowered, the mold 100 is closed, and the molding material 1A is press-molded. The molding process is performed in a state where the temperature at which the thermoplastic resin body 10A in the preheated molding material 1A can flow is maintained.

  In the molding process, the lower mold 110 and the upper mold 112 are pressed until the thickness of the molding material 1A reaches the thickness of the base portion 12 of the target molded product 1. At this time, as shown in FIG. 6, the thickness of the thermoplastic resin body 10 </ b> A is reduced to form the base portion 12, and part of the thermoplastic resin body 10 </ b> A is reinforced fiber in the fiber reinforced thermoplastic resin layer 16. It flows between them, jumps out to the upper mold 112 side, and is molded so as to follow the shape of the cavity 114. Thereby, the thermoplastic resin molded body 10 having the base portion 12 and the protruding portion 14 protruding from the base portion 12 so as to penetrate the fiber reinforced thermoplastic resin layer 16 is formed.

The temperature of the mold 100 in the molding step is lower than the preheating temperature, and the temperature is adjusted to a temperature at which the molding material 1A is solidified in the state of being molded into the shape of the cavity 114.
The temperature of the mold 100 varies depending on the type of thermoplastic resin used, but is preferably 60 to 180 ° C, more preferably 100 to 130 ° C.

The molding pressure in the molding process, that is, the pressure applied to the molding material 1A by the lower mold 110 and the upper mold 112 of the mold 100 is preferably 0.2 to 50 MPa, and more preferably 3 to 30 MPa.
The molding time is preferably 0.2 to 10 minutes, and more preferably 0.5 to 3 minutes.
After the molding material 1A is solidified in the mold 100, the mold 100 is opened and the molded product 1 is taken out.

In the method for producing a molded article of the present invention described above, after a sheet-like molded body having a fiber reinforced thermoplastic resin layer provided on the surface of the base portion is molded, a protrusion is formed on the surface of the sheet-like molded body by injection molding. Compared with the case of forming, the number of times of molding can be reduced, so that it is easy to manufacture a molded product.
Further, in the present invention, as described above, a part of the thermoplastic resin body flows inside the fiber reinforced thermoplastic resin layer to form a protrusion, so that together with the thermoplastic resin in the fiber reinforced thermoplastic resin layer, Part of the reinforcing fiber is likely to be mixed into the protrusion. Thus, the strength of the protrusions is further increased by mixing the reinforcing fibers into the protrusions.

In addition, the manufacturing method of the molded product of the present invention is not limited to the manufacturing method of the molded product 1 described above. For example, the method for producing a molded product according to the present invention uses a molding material in which a fiber-reinforced thermoplastic resin layer is provided only on one side of a sheet-like thermoplastic resin body, and fiber-reinforced heat is applied only on one side of a sheet-like base portion. It may be a method for producing a molded article provided with a plastic resin layer.
When a molded product having a sheet-like base portion is produced by the method for producing a molded product of the present invention, the molded product obtained is less likely to warp, and a molded product having a higher strength is easily obtained. A method of using a molding material in which a fiber reinforced thermoplastic resin layer is disposed on both surfaces of a thermoplastic resin body is preferable.
The method for producing a molded product of the present invention may be a method for producing a molded product having a base portion having a shape other than a sheet shape.

In the method for producing a molded article of the present invention, the thermoplastic resin body and the fiber reinforced thermoplastic resin layer forming the molding material are separately heated, and then laminated in a mold used in the molding process to obtain the molding material. It may be formed.
In addition, the method for producing a molded product of the present invention includes press molding with a mold adjusted to a temperature at which the thermoplastic resin body can be heated to a flowable temperature in the molding process without performing the preheating process. The mold may be opened after the mold is cooled to solidify the molding material, and the molded product may be taken out. However, from the viewpoint of productivity, the method for producing a molded product of the present invention is preferably a method having the above-described preheating step and molding step.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by the following description.
[Evaluation of protrusion strength]
The protrusion was gripped with pliers and twisted to break the root of the protrusion, and the strength of the protrusion was evaluated based on the degree of force required for this.

[Example 1]
As the thermoplastic resin body 10A of the molding material 1A illustrated in FIG. 3, a sheet-shaped thermoplastic resin body of 170 mm × 120 mm × 2.0 mm made of polypropylene (trade name “NOVATEC PP FY4”, manufactured by Nippon Polypro Co., Ltd.) is prepared. did. In addition, as the fiber reinforced thermoplastic resin layers 16 and 18, acid-modified polypropylene (trade name “MODIC” is used as a reinforced fiber in which long fibers made of carbon fiber (trade name “Pyrofil TR50S”, manufactured by Mitsubishi Rayon Co., Ltd.) are aligned in one direction. P958V "(manufactured by Mitsubishi Chemical Corporation) was impregnated and orthogonally laminated to create a sheet-like fiber-reinforced thermoplastic resin layer having a volume content of reinforcing fibers of 33% and 170 mm x 120 mm x 0.25 mm .

Subsequently, the obtained fiber reinforced thermoplastic resin layer 18, the thermoplastic resin body 10A, and the fiber reinforced thermoplastic resin layer 16 are laminated in this order to form a molding material 1A, and the molding material 1A is preheated to 240 ° C. by an infrared heating furnace. did. Thereafter, the preheated molding material 1A was transferred onto the lower mold 110 of the mold 100 illustrated in FIG. 4, the upper mold 112 was lowered, the mold 100 was closed, and press molding was performed to obtain the molded product 1. The temperature of the mold 100 in the press molding was 130 ° C., the molding pressure was 22 MPa, and the molding time was 2 minutes. The base portion 12 had a thickness of 1.0 mm, and the protrusion 14 had a height of 5 mm.
The obtained molded product 1 had a high strength of the protrusion 14.

[Comparative Example 1]
A molding material similar to that of Example 1 was prepared except that the thickness of the thermoplastic resin body 10A was 1.0 mm, and heated and pressurized by a mold under the conditions of a temperature of 130 ° C. and a pressure of 22 MPa, and 170 mm × 120 mm × 1. A 5 mm sheet-like molded body was obtained. Next, the molded body is placed in an injection mold, and polypropylene (trade name “Novatech PP FY4”, manufactured by Nippon Polypro Co., Ltd.) is injection molded under the conditions of a cylinder temperature of 200 ° C. and a mold temperature of 80 ° C. A protrusion was formed on the fiber reinforced thermoplastic resin layer to obtain a molded product having the same shape as the molded product 1.
The projecting portion of the obtained molded product required less force to break the root than the projecting portion 14 of the molded product 1 of Example 1, and was inferior in strength.

DESCRIPTION OF SYMBOLS 1 Molded article 10 Thermoplastic resin molding 12 Base part 14 Protrusion part 16, 18 Fiber reinforced thermoplastic resin layer

Claims (6)

A thermoplastic resin molded body having a base portion and a protruding portion protruding from the base portion, and a fiber-reinforced thermoplastic resin layer disposed on at least a part of the surface of the base portion,
A molded product in which the protrusion protrudes through the fiber-reinforced thermoplastic resin layer.   The molded article according to claim 1, wherein the base portion is in a sheet form, and the fiber reinforced thermoplastic resin layers are respectively disposed on both sides of the base portion.   The molded article according to claim 1 or 2, wherein the reinforcing fibers forming the fiber-reinforced thermoplastic resin layer are long fibers. A method for producing a molded product according to claim 1,
A molding material in which a fiber reinforced thermoplastic resin layer is disposed on at least a part of the surface of the thermoplastic resin body used for forming the thermoplastic resin molded body is molded by a mold, and a part of the thermoplastic resin body is The manufacturing method of a molded article which has a shaping | molding process which is made to flow to the surface side of a fiber reinforced thermoplastic resin layer, and forms the said projection part.   The manufacturing method of the molded article of Claim 4 whose said molding material is a molding material by which the fiber reinforced thermoplastic resin layer is arrange | positioned on both surfaces of the said sheet-like thermoplastic resin body.   The manufacturing method of the molded article of Claim 4 or 5 whose reinforced fiber which forms the said fiber reinforced thermoplastic resin layer is a long fiber.

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