JP3235721B2 - Molding method of laminated molded body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a laminated molded product suitable for an automotive dash panel attached to a dash panel, and more particularly to a method of forming a sound absorbing material on a vehicle body panel by enhancing the formability of the sound absorbing material. The present invention relates to a method for forming a laminated molded product with improved fit, improved mounting workability, and improved sound insulation performance.

[0002]

2. Description of the Related Art For example, as shown in FIG. 12, a dash panel 1 for partitioning an engine room E and a vehicle room R is provided with a dash panel 1 for preventing noise transmission from the engine room E to the vehicle room R. For this purpose, an insulator dash 2 is provided.

The insulator dash 2 is composed of a relatively high-density sound insulating material 3 such as a PVC sheet or a rubber sheet mixed with a filler, and a sound absorbing material 4 made of a porous base material such as felt, polyurethane foam, or nonwoven fabric. Laminated structures are commonly used. The sound absorbing material 4 absorbs noise from the engine room E, and the double-walled sound insulating effect between the dash panel 1 and the sound insulating material 3 exhibits good soundproofing properties in addition to the sound absorbing effect. Is configured.

By the way, recently, a molded sound absorbing material is mainly used as the sound absorbing material 4 so as to accurately fit the surface shape of the dash panel 1. For example, a fiber-based material is formed by adding a binder resin to synthetic fiber or cotton, and pressing and molding. In this case, a heat-fusible fiber such as a polyethylene resin or a polypropylene resin is used as the thermoplastic binder resin, and a phenol resin or the like is often used as the thermosetting binder resin.

[0005] As shown in FIG. 13, Japanese Unexamined Patent Publication No. 6-344486 discloses a sound absorbing material 4 having a two-layer structure of a two-layer sound absorbing material, that is, a shape-retaining sound absorbing material 4 a and a flexible sound absorbing material 4 b. And so on. The shape-retaining sound absorbing material 4a holds a shape formed in accordance with the surface shape of the dash panel 1, and the flexible sound absorbing material 4b has a function of attenuating vibration from the dash panel 1.

As shown in FIG. 14, a method of forming the insulator dash 2 is to heat and soften a thermoplastic resin sheet S, which is a material of the sound insulating material 3, to a predetermined temperature in a heating furnace 5a. Sound absorbing material 4a, 4b
The fiber mats m ₁ and m ₂ , which are the respective materials, are also heated to a predetermined temperature in the heating furnace 5b.

Then, after setting the thermoplastic resin sheet S on the mold surface of the lower mold 6 for cold press molding, the fiber mats m ₁ and m ₂ are set thereon, and the upper mold 7 for cold press molding is lowered. The thermoplastic resin sheet S and the fiber mats m ₁ and m ₂ are integrally press-molded in the upper and lower dies 6 and 7 for cold press molding, and are provided on the upper die 7 as shown in FIG. blow pipe 8 bites into the fiber mat m ₁ which is a material of the shape retention sound absorbing material 4a, the compressed air is fed through the blowing pipe 8,
The fiber mats m ₁ and m ₂ are forcibly cooled, and the compressed air is used to lower the thermoplastic resin sheet S into the lower mold 6.
The mold is pressed against the mold surface to perform accurate molding.

[0008]

As described above, the conventional insulator dash 2 is composed of two layers of the shape-preserving sound absorbing material 4a and the flexible sound absorbing material 4b as the material of the sound absorbing material 4 as described above. The density of each of the fiber mats m ₁ and m ₂ , which are both materials, is 0.020 to 0.050 g for m ₁ .
/ Cm ³ , and the density of m ₂ is 0.025 to 0.075.
g / cm ³ , which are set to almost the same density.

Therefore, when compressed air is supplied through the blow pipe 8 as shown in FIG. 15, the fiber mat m ₁ ,
m ₂ , blow leakage occurs, and particularly, the flexible sound absorbing material 4 b
Since the fiber mat m ₂ constituting the does not follow the mold surface of the upper mold 7, when mounting the insulator dash 2 to the dash panel 1, good attachment workability is disadvantageously not obtained. Further, since the sound absorbing material 4 cannot be formed to a desired thickness, a predetermined double wall sound insulating effect cannot be obtained, and a decrease in sound insulating performance such as a gap between the insulator dash 2 and the dash panel 1 is caused. There was also a drawback of inviting.

The present invention has been made in view of such circumstances, and is suitable for a soundproofing material in which a soundproofing material and a plurality of layers of sound absorbing materials are laminated or a soundproofing material in which a plurality of layers of sound absorbing materials are integrated. It is an object of the present invention to provide a method for forming a laminated molded article, which is capable of improving the fitting property to a vehicle body panel and improving sound insulation performance by increasing the molding accuracy of a sound absorbing material. .

[0011]

In order to achieve the above object, the invention according to claim 1 uses a sound insulating material made of a thermoplastic sheet and a thermoforming fiber mat of at least two layers. In the method of forming a laminated molded body comprising a plurality of layers of sound absorbing material, among the two or more thermoforming fiber mats, a density difference is provided for each of the mats, and the high density mat is at least twice as dense as the low density mat. In the cold press mold, heat-softened thermoplastic sheet and thermoforming fiber mat are set so that the low density mat is located between the thermoplastic sheet and the high density mat. Pressed into the required shape inside, and the tip is protruded from the mold surface on one side, and compressed air is blown through the blow pipe that bites into the low density mat In addition to forcibly cooling the fiber mat for thermoforming and pressing the thermoplastic sheet against the mold surface of the mold on the other side, the high density mat is pressed against the mold surface of the mold on one side to assist molding. And

Here, as an application example of the laminated molded body, there is, for example, an insulator dash for an automobile mounted on the indoor side of a dash panel, which is composed of a sound insulating material and a plurality of layers of a sound absorbing material.

As a material of the sound insulating material, a thermoplastic sheet such as a (recycled) PVC sheet or a (recycled) rubber sheet is used.
As a material of the sound absorbing material, a fiber mat for thermoforming is used. For example, 50 to 80 parts by weight of a thermoplastic synthetic resin fiber such as nylon, polyacrylonitrile, polyacetate, polyethylene terephthalate, etc. A nonwoven fabric mat composed of 50 to 20 parts by weight of a low melting point heat fusible fiber such as polyethylene, polypropylene, linear polyester, polyamide, etc. A bulky nonwoven fabric mat formed in a mat shape may be used,
In addition to this, a thermoforming fiber mat or the like can be used as the thermoforming fiber mat. Further, the fiber mat for thermoforming uses at least two layers.

When a thermoplastic sheet and a plurality of layers of thermoforming fiber mats are laminated in a cold press mold, for example, when two layers of thermoforming fiber mats are used, one side of the fiber mats must be raised. Density, for example 0.040
To a density of 0.150 g / cm ³ and a low density of 0.1% on the other side.
The density is set to 020 to 0.075 g / cm ³ and set in a mold so that a low density mat is sandwiched between a thermoplastic sheet and a high density fiber mat.

When the thermoforming fiber mat has three layers, the intermediate layer is made of a high-density fiber mat, and the upper and lower sides are each made of a low-density mat. And a low-density mat between them.

At the time of cold press molding, the blow pipe provided on one side of the molding die bites into the thermoforming fiber mat, so that the tip of the blow pipe is located in the low-density mat. The compressed air is supplied to forcibly cool the thermoforming fiber mats of each layer, and the difference in airflow resistance between the low-density mat and the thermoplastic sheet, and the airflow between the low-density mat and the high-density mat. Due to the difference in resistance value, the thermoplastic sheet is
In addition, the high-density fiber mat is pressed against one of the molding dies, and both the sound insulating material and the sound absorbing material are accurately molded so as to follow the mold surface of the molding dies.

According to a second aspect of the present invention, a vacuum suction mechanism is provided on the other side of the molding die,
If the thermoplastic sheet is evacuated along the mold surface of the other mold, high moldability can be obtained in the laminated molded article.

Next, a third aspect of the present invention relates to a method for forming a laminated molded product by forming a three-layered thermoforming fiber mat into a required shape by cold press molding. Among the mats, the density of the upper and lower fiber mats is set to be at least twice as high as the density of the fiber mats located in the middle, and after heating and softening the three layers of thermoforming fiber mats, the inside of the cold press mold At the same time, the mold is pressed into the required shape by clamping the cold press mold, and at the same time, it is arranged so that the tip protrudes from the mold surface of at least one side, and through the blow pipe that bites into the low density mat The method is characterized in that compressed air is blown to perform forced cooling of the fiber mat for thermoforming, and the upper and lower high-density mats are pressed against the mold surface of the mold to assist molding.

Here, as a sound absorbing material composed of a three-layer fiber mat, a sound insulating material can be adhered in a later step and used for an insulator dash or the like, and can be used as a sound absorbing material in an engine room or a trunk room. Use is also possible.

In this case also, at the time of cold press molding, the three-layer thermoforming fiber mat is press-molded.
At that time, the blow pipes arranged in the mold on one side cut into the low-density mat of the intermediate layer and supply compressed air, so the upper and lower high-density mats are pressed against the mold surface of the mold. In addition, it is possible to form a laminated molded body with improved mold transferability.

As is apparent from the above constitution, according to the method of the present invention, a density difference is provided in a multilayer thermoforming fiber mat, and a low density mat is arranged between a high density mat and a thermoplastic sheet. Each material is set in a cold press mold, and cold press molding is performed.At the same time, the tip of the blow pipe provided in the mold on the fiber mat side for thermoforming is cut into the low-density mat and compressed air is released. If supplied, the fiber mat is forcibly cooled, and the difference in airflow resistance between the low-density mat and the thermoplastic sheet, and the difference in airflow resistance between the high-density mat and the low-density mat, The plastic sheet and the high-density fiber mat are pressed against the mold surface by compressed air, respectively, so that the sound insulating material and the sound absorbing material can obtain high-precision mold transferability.

Further, in the method of forming a sound-absorbing material made of a three-layered fiber mat, a low-density mat is arranged on the intermediate layer, and a high-density mat is arranged on the upper and lower sides. If the tip of the blow pipe provided in the mold is cut into the low-density mat and high-pressure air is supplied, the fiber mat for thermoforming is forcibly cooled and the high-density mat on both sides is placed on the mold surface. Pressing is performed due to the difference in the ventilation resistance value, and a sound absorbing material having excellent mold transferability of the mold can be obtained.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a method for forming a laminated molded product according to the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 7 show a first embodiment of the present invention. FIG. 1 is a cross-sectional view showing a structure of an automobile insulator die formed by the method of the present invention, and FIGS.
Fig. 2 shows the respective steps of the method of the present invention. Fig. 2 is an explanatory view showing a production step of a fiber mat for thermoforming. Figs. 3 and 4 are explanatory views showing each preheating step of a thermoplastic sheet and a fiber mat for thermoforming. FIG. 5 is an explanatory view of a setting step of setting a thermoplastic sheet and a fiber mat for thermoforming in a press die, FIG. 6 is a cross-sectional view showing a cold press forming step, and FIG. FIG.

First, referring to FIG. 1, an insulator dash 10 for an automobile manufactured by the method of the present invention may be a rubber sheet or a PVC sheet filled with an inorganic filler.
A sound insulating material 20 made of a flexible material having a relatively high surface density;
The dash panel 40 is integrated with the back surface of the sound insulating material 20 and is made of a laminate with a sound absorbing material 30 made of a porous base material having a desired sound absorbing function. Is formed in a shape that conforms to the shape of the indoor surface.

In the present embodiment, the sound absorbing material 30 is composed of three layers of sound absorbing materials 31, 32, and 33, each having a thick-walled shape-preserving sound-absorbing material 31 and a thin-walled shape-preserving sound-absorbing material 3.
2, a thin flexible sound absorbing material 33 having a thin shape, and the shape retaining sound absorbing material 32 at the center is formed at a high density;
The flexible sound absorbing material 33 is set to have a low density.

The shape-retaining sound absorbing members 31 and 32 have a shape maintaining function, are closely attached to the dash panel 40, and appropriately maintain the clearance between the dash panel 40 and the sound insulating material 20 for each part. In addition to having a desired sound insulation function, the flexible sound absorbing material 33 has a function of attenuating the noise transmitted from the dash panel 40.

Although the insulator dash 10 manufactured by the method of the present invention is configured as described above, the difference from the conventional one is that the density of the central shape-retaining sound absorbing material 32 at the center is reduced by the shape-retaining sound absorbing material 31 on both sides. By setting the density of the flexible sound absorbing material 33 to twice or more, the forming accuracy of the sound absorbing material 30 is improved.

The details will be described in detail with reference to FIGS. FIG. 2 shows a manufacturing process of the thermoforming fiber mat M which is a material of the sound absorbing material 30 having a three-layer laminated structure. As shown in the drawing, the sound absorbing material 31 is placed on a conveyor 50 from cards 51, 52, 53. , 32, and 33 are supplied in a bulky state to the fiber mats M ₁ , M ₂ , and M ₃ .

More specifically, each of the cards 51, 52, 53
The inside contains synthetic fibers and heat-fusible fibers. The synthetic fibers have a higher melting point than the heat-fusible fibers, and are made of synthetic resin fibers such as nylon, polyacrylonitrile, polyacetate, and polyethylene terephthalate. It may be appropriately selected. The heat-fusible fibers include polyethylene,
A material obtained by mixing a synthetic fiber and a heat-fusible fiber at an appropriate ratio using a material such as polypropylene, linear polyester, or polyamide is supplied onto the conveyor 50.

Thereafter, punching is performed by a needle punching machine 54, and heat treatment is performed by a hot air heating furnace 55 to melt the heat-fusible fibers, thereby producing a three-layer thermoforming fiber mat M. The fiber mat M for thermoforming is fiber mats M ₁ , M ₂ , and M ₃ corresponding to the shape-preserving sound absorbing materials 31 and 32 and the flexible sound absorbing material 33, and the density of the central fiber mat M ₂ . Is 0.040 to 0.150 k / c
m ³ , and the upper and lower fiber mats M ₁ , M ₃
Is set to a low density of 0.020 to 0.075 g / cm ^{3, and} the density of the central fiber mat M ₂ is set to be at least twice the upper and lower fiber mats M ₁ and M ₃ . .

Next, as shown in FIG. 3, a thermoplastic resin sheet S, which is a material of the sound insulating material 20, is heated and softened to a predetermined temperature by a heating furnace 60, and as shown in FIG. Similarly, the fiber mat M is heated and softened to a predetermined temperature by the heating furnace 61.

Then, as shown in FIG. 5, the thermoplastic resin sheet S subjected to heat softening and the fiber mat M for thermoforming are set in the upper and lower dies 70, 80 for cold press molding in an open state. This upper and lower mold 7 for cold press molding
In reference numerals 0 and 80, the lower mold 70 is provided with a vacuum suction mechanism in order to enhance the formability of the sound insulating material 20. That is, vacuum suction holes 71 are opened at a plurality of locations on the mold surface of the lower mold 70, and the air chamber 72 of the lower mold 70 is connected to a vacuum suction pump 74 through a vacuum suction pipe 73. The operation causes the vacuum suction mechanism to operate.

On the other hand, the upper die 80 can be moved up and down by a predetermined stroke by an elevating cylinder 81, and a blow pipe 82 is set on the upper die 80 so that its tip 82 a protrudes from the die surface of the upper die 80. The blow pipe 82 is in communication with an air chamber 83 in the upper die 80, and the air chamber 83 of the upper die 80 is connected to a pneumatic pump 85 through a pneumatic tube 84, Open / close valve 86
Is installed. The upper and lower dies 7 for cold press molding
At 0 and 80, cooling pipes 76 and 87 are provided.

The upper and lower molds 7 for cold press molding
When 0,80 is in the mold open state, after setting the thermoplastic resin sheet S subjected to the heat softening treatment and the fiber mat M for thermoforming in the mold, the upper mold 80 for cold press molding is set as shown in FIG. The lowering operation is performed by the operation of the raising / lowering cylinder 81, and the thermoplastic resin sheet S and the fiber mat M for thermoforming are drawn and formed by clamping the upper and lower dies 70 and 80 for cold press forming, and at the same time, the vacuum suction arranged in the lower die 70. By the operation of the mechanism, the thermoplastic resin sheet S is evacuated so as to be in close contact with the mold surface of the lower mold 70, and the tip 82a of the blow pipe 82 provided in the upper mold 80 is positioned at the lowermost layer of the thermoforming fiber mat M. bite the mat M _1, as shown in the enlarged view of FIG. 7 via pneumatic pump 85, blowing compressed air into the fiber for thermoforming mat M _1.

[0036] At this time, compressed air is a thermoplastic sheet S of the air-impermeable not only pressed against the lower mold surface 68, an intermediate fiber mat M _2, airflow resistance by density difference of the fiber mat M ₁ the lowermost Because the values are different, the middle fiber mat M
₂ is pressed so as to follow the mold surface of the upper mold 80, and
Fiber mat M ₃ is to be shaped into close contact shape the mold surface of the upper mold 80.

Accordingly, since the sound absorbing material 30 can be formed with a predetermined thickness and accurately formed on a mold surface that follows the mold surface of the upper mold 80, the fitting property to the dash panel 40 is improved, Installation work can be performed smoothly,
There is an effect that good sound insulation performance can be maintained.

Next, FIGS. 8 and 9 show a modification of the first embodiment according to the present invention, which is applied to a method of forming an insulator dash 10 for an automobile. 20 and two layers of sound absorbing materials 34 and 35. That is, the shape retention sound absorbing material 34 a fiber mat M ₄ of low density and material, flexible sound absorbing material 35 is a material of the fiber mat M ₅ high density.

[0039] Therefore, when press forming shown in FIG. 9, the blow pipe 82 for thermoforming fiber mat M ₄ which is a material of the shape retention sound absorbing material 34 of low density bite, by supplying compressed air, as in the first embodiment presses the thermoformed fiber mat M ₅ on the mold surface of the upper mold 80 at the same time pressing the thermoplastic sheet S on the mold surface of the lower mold 70, the sound absorbing material 3 having a two-layer
4,35 high-precision molding becomes possible. The lower mold 60
May be omitted.

Next, FIGS. 10 and 11 show a second embodiment of the present invention, which is an embodiment applied to a method of forming a sound absorbing material 30 having a three-layer structure. The high-density sound absorbing members 36 and 38 and the intermediate low-density sound absorbing member 37 are provided. The density of the upper and lower high-density sound absorbing members 36 and 38 is set to be at least twice the density of the low-density sound absorbing member 37 at the center.
Fiber mats M ₆ , M ₇ , M ₈ which are materials corresponding to No. 38
After preheating and softening, the upper and lower dies 7 for cold press molding
0,80, the upper mold 7 is formed as shown in FIG.
0 to the tip 82a of the blow pipe 82 bite into the center of the fiber mat M ₇ provided, each by a difference in air flow resistance value of the fiber mat of the upper and lower side fiber mat M _6, M ₈ is the upper and lower mold 70, 80 It is pressed against the mold surface, enabling accurate molding.

The sound absorbing material 30 having a three-layer structure as described above.
If it is molded with high precision, it can be applied to the insulator dash 10 if it is adhered to the sound insulating material 20, or it can be installed in a trunk room or the like as the sound absorbing material 30 alone. Although the above embodiment has been described using the bulky nonwoven fabric mat as the embodiment of the thermoforming fiber mat M which is the material of the sound absorbing material 30, a thermoforming felt may be used.

[0042]

As described above, according to the method of the present invention, the following special effects can be obtained.

(1) The present invention relates to a blowpipe installed in a mold at the time of cold press molding, in which a plurality of fiber mats for thermoforming are laminated and subjected to cold press molding. The fiber mat is forcibly cooled by feeding compressed air into the low-density mat, and the high-density mat is pressed against the mold by utilizing the difference in ventilation resistance, and the sound absorbing material follows the mold. Since it can be formed with high precision, it can be formed into a shape corresponding to the shape of the vehicle body panel with high accuracy, and the workability of mounting on the vehicle body panel can be performed smoothly, and the workability of mounting is improved.

(2) According to the present invention, when a fiber mat for thermoforming is laminated in multiple layers and cold press molding is performed, a density difference is set for each fiber mat, and a blow pipe installed in a mold during cold press molding. The fiber mat is forcibly cooled by feeding compressed air into the low-density mat, and the high-density mat is pressed against the mold by utilizing the difference in ventilation resistance, and the sound absorbing material follows the mold. Because it is possible to mold the sound absorbing material to a desired thickness,
The thickness of the sound absorbing material can be ensured for each part, an excellent double wall sound insulating effect can be obtained, and the sound insulating performance can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an insulator dash manufactured by applying a first embodiment of the method of the present invention.

FIG. 2 is an explanatory view showing a production process of a fiber mat for thermoforming in the method of the present invention.

FIG. 3 is an explanatory view showing a step of preheating a thermoplastic sheet in the method of the present invention.

FIG. 4 is an explanatory view showing a preheating step of the fiber mat for thermoforming in the method of the present invention.

FIG. 5 is a sectional view showing a step of setting each material to a press die in the method of the present invention.

FIG. 6 is a sectional view showing a cold press forming step in the method of the present invention.

FIG. 7 is an essential part cross sectional view showing a step of forming a sound absorbing material in the method of the present invention.

FIG. 8 is a sectional view showing another embodiment of the insulator dash manufactured by applying the first embodiment of the method of the present invention.

FIG. 9 is a sectional view showing a step of forming the insulator dash shown in FIG. 8;

FIG. 10 is a sectional view of a sound absorbing material according to a second embodiment of the present invention.

FIG. 11 is a sectional view showing a step of forming the sound absorbing material shown in FIG. 10;

FIG. 12 is an explanatory view showing a place where an insulator dash for a vehicle is installed.

FIG. 13 is a cross-sectional view showing a configuration of a conventional automotive insulator dash.

FIG. 14 is an explanatory view showing a forming process of a conventional automotive insulator dash.

FIG. 15 is an explanatory view showing a defect in a molding process of a conventional insulator dash.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Insulator dash for motor vehicles 20 Sound insulation material 30 Sound absorption material 31, 32, 34 Shape-preserving sound absorption material 33, 35 Flexible sound absorption material 40 Dash panel 50 Conveyor 51, 52, 53 Card 60, 61 Heating furnace 70 Cold press molding lower Mold 71 Vacuum suction hole 80 Upper mold for cold press molding 81 Cylinder for lifting and lowering 82 Pipe for blowing S Thermoplastic resin sheet M Fiber mat for thermoforming

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI B29L 31:58 B29L 31:58 (56) References JP-A-6-328479 (JP, A) JP-A-6-206230 (JP) JP-A-3-224847 (JP, A) JP-A-2-235711 (JP, A) JP-A-58-96919 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) B29C 43/00-43/58

Claims (3)

(57) [Claims] 1. A sound insulating material (20) made of a thermoplastic sheet (S), and a plurality of layers of a sound absorbing material (30) made of at least two or more thermoforming fiber mats (M). In the method of forming a laminated molded article, among the two or more layers of the thermoforming fiber mat (M), each mat is provided with a density difference, and the high density mat (M ₂ ) is twice the low density mat (M ₁ ). The thermoplastic sheet (S) and the fiber mat for thermoforming (M), which have been set to the above density and which have been heated and softened, are placed in a cold press mold (70, 80) with the thermoplastic sheet (S) and the high-density mat ( M ₂ ) is set so that the low-density mat (M ₁ ) is located, and is pressed into a required shape in a cold press mold (70, 80), and the mold of one mold (80) is formed. Surface with its tip protruding from the surface. (M ₁₎ blowing compressed air through a pipe (82) for blow that bite into, as well as forced cooling the thermoforming fiber mat (M), the other side of the mold the thermoplastic sheet (S) (7
A molding method for a laminated molded article, wherein the molding is assisted by pressing the high-density mat (M ₂ ) against the mold surface of the molding die (80) on one side while being pressed against the mold surface of (0). 2. A vacuum suction hole formed in the mold surface of the other mold (70) simultaneously with the press molding between the cold press molds (70, 80). The method according to claim 1, wherein vacuum suction is performed through (71). 3. A method for forming a laminated molded product by forming a three-layer thermoforming fiber mat (M) into a required shape by cold press molding, wherein: The density of the upper and lower fiber mats (M ₆ , M ₈ ) is set to be at least twice as high as the density of the fiber mat (M ₇ ) located in the middle. After heat softening,
The mold is set in a cold press mold (70, 80) and press-molded to a required shape by clamping the cold press mold (70, 80). Compressed air is blown through a blow pipe (82) that is provided so as to protrude and cuts into the low-density fiber mat (M ₇ ), thereby forcibly cooling the thermoforming fiber mat (M), and increasing the height of the upper and lower sides. A method for forming a laminated molded article, comprising: pressing a fiber mat (M ₆ , M ₈ ) having a high density against a mold surface of a cold press mold (70, 80) to assist molding.