KR100573950B1 - Equipment for the production of hollow plastic panel and preparing method - Google Patents

Abstract

The present invention relates to an apparatus for manufacturing a hollow molded synthetic resin panel used for interior parts of a vehicle, building formwork, furniture, and the like, and a method for manufacturing the panel using the same. More specifically, a panel formed by attaching a heating sheet to a skin material is provided. The upper and lower panels (6, 7) is composed of a double, between the upper panel (6) and the lower panel (7) of the hollow structure 73 of the panel for improving the impact strength of the product is formed In the manufacture of blow molded synthetic resin panel, the hollow molded part that can facilitate the joining of the hollow portion 73 and the upper and lower panels 6 and 7 of the panel between the upper panel 6 and the lower panel 7 The present invention relates to an apparatus for producing a synthetic resin panel and a method for producing a panel using the same.

In particular, the present invention in forming the hollow portion 73 of the panel by injecting air between the upper panel 6 and the lower panel 7, the side of the product when injecting air using a conventional nozzle (74), etc. The needle-shaped air inlet 3 and the air intakes 22, 22 ', etc., are drawn out to solve the problem of product use and the troublesome work due to the occurrence of the nozzle hole 75 in the By using the manufacturing apparatus of the present invention and a manufacturing method thereof, no holes such as nozzle holes 75 are generated at the side of the hollow molded panel 10, which is a finished product, and the upper panel 6 and the lower part. The present invention relates to an apparatus for producing a hollow molded synthetic resin panel which can easily bond the panel 7 and to the hollow portion 73 of the panel, and a method for manufacturing the panel using the same.

Skin material, heating sheet, upper and lower panel, panel hollow part, needle type air inlet, air suction part

Description

 Apparatus for manufacturing hollow molded synthetic resin panel and method for manufacturing panel using same {{EQUIPMENT FOR THE PRODUCTION OF HOLLOW PLASTIC PANEL AND PREPARING METHOD}

1 is an enlarged reference view showing a perspective view and a side of a panel according to the present invention;

2 is a process diagram schematically showing a manufacturing process of the panel according to the present invention;

Figure 3 is a cross-sectional view showing a panel manufacturing apparatus of the present invention,

Figures 4a to 4c is a reference diagram showing the operating state of the needle-like air inlet at the time of air injection into the opening of the lower skin and lower heating sheet and the panel of the present invention,

Figure 5a is a reference diagram showing the state of the needle-like air inlet in the opening state of the lower skin and lower heating sheet in another embodiment of the present invention,

5B is a reference diagram showing a state of a needle-shaped air inlet when air is injected into a hollow portion of a panel according to another embodiment of the present invention;

Figure 5c is a reference diagram showing the state of the needle-shaped air inlet in another embodiment of the present invention,

Figure 6 is a cross-sectional view showing a conventional panel manufacturing apparatus,

7 is an enlarged reference view showing a perspective view and a side of a conventional panel.

<Description of the symbols for the main parts of the drawings>

10 Blow Molding Panel

1 Upper mold

11,11 'cooling pipe

2 lower mold

21 Blow Molding Part

21a bottom 21a, 21 "ends

22,22 'Air Intake 23,23' Cooling Pipe

24,24 'support 25,25' clamping

3,3 ', 3 "Needle Air Inlet

31 Body 32 Air Cylinder

33 Rotary Motor 34 Injection Hole

35 Guide

4 compressor

5,5 'suction pump

6 Top panel

61 Upper skin material 62 Upper heating sheet

7 Lower panel

71 Lower skin material 72 Lower heating sheet

73 Hollow part of the panel 74 Nozzle

75 nozzle hole

The present invention relates to a manufacturing apparatus of a hollow molded synthetic resin panel used for interior parts of a vehicle, and a method for manufacturing a panel using the same. More specifically, a panel formed by attaching a heating sheet to a skin material is provided as an upper panel and a lower panel. In the manufacturing of a hollow molded synthetic resin panel is formed in a double, the hollow portion of the panel is formed between the upper panel, the lower panel to improve the impact strength of the product, the hollow portion of the panel between the upper panel and the lower panel To provide a manufacturing apparatus of a hollow molded synthetic resin panel that can facilitate the manufacture and joining of the upper and lower panels, and a method of manufacturing the panel using the same.

have.

In particular, a hole such as a nozzle hole for injecting air for forming the hollow portion of the panel is not generated on the outer surface of the side surface of the hollow molded article and the like, and the hollow molded product can easily join the upper panel and the lower panel. An apparatus for producing a synthetic resin panel and a method for manufacturing a panel using the same are provided.

Conventionally, the hollow molded synthetic resin panel used for the purpose is a manufacturing apparatus for forming a hollow part of the panel between the upper and lower panels for improving the impact strength and the like, as shown in Figure 6 the lower panel (7) by installing a nozzle (74), etc. to inflow the outside air on the side of the upper side of the upper heating sheet (72) to inflow the outside air to use the method of introducing compressed air into the hollow portion (73) of the panel. However, the manufacturing apparatus and method of manufacturing the same by inserting the nozzle 74 into the upper side of the lower heating sheet 72 of the lower panel 7 by injecting air, as shown in Figure 7, The nozzle hole 75 is formed on the upper side of the heating sheet of the lower panel of the final product as much as the width of the nozzle, so that the product is broken due to a decrease in strength when the consumer uses it. It is to be foreign matter from entering were the problems of hygiene, such as the foreign-matter accumulation and odor, there was such a problem can not be cleaned.

In addition, by installing a nozzle 74 on the upper side of the lower heating sheet 72 of the lower panel 7 to introduce compressed air into the hollow portion 73 of the panel, the lower heating sheet 72 opens the nozzle hole. Due to problems such as clogging, the hollow part 73 of the panel was a cause of defects, and defective products frequently occurred, and there was a problem such as complicated operation due to insertion and dismantling of the nozzle 74, and air injection. After the skin material 71 and the heating sheet 72 of the lower panel is stretched up or down in the original state, such as the sagging or sagging, it is not properly bonded with the upper panel 6, so that the adhesion strength and appearance of the product may be reduced. There was a problem such as producing a defective product that is impossible to use crushed.

The present invention solves the above-mentioned problems of the prior art and is lowly drawn. In the manufacture of the panel for the above use, a hole such as a nozzle hole is not formed on the outer surface of the side of the hollow molded panel, which is a finished product. It solves the problems such as deterioration of product strength and accumulation of foreign matters, and it is easy to form the hollow part of the panel by injecting compressed air.When forming the hollow part of the panel, the skin material and heating sheet of the lower panel Manufacturing apparatus of the hollow molded synthetic resin panel and the panel using the same, which is easy to join the upper panel to maintain the original state, and the effect of improving the bonding force, the appearance of the product is beautiful and no defective products are generated. It is an object of the present invention and the technical problem to be achieved by providing a method.

In order to achieve the above object, the configuration of the manufacturing apparatus for manufacturing the hollow molded synthetic resin panel of the present invention;

1) Upper mold

2) lower mold

3) hollow part of panel

4) Needle type air inlet

5) air cylinder

6) Revolution Motor

7) air intake

8) clamping

9) support

10) Compressor, etc.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it is apparent that the present invention is not limited to the embodiments described below.

1 is a reference view showing an enlarged perspective view and side view of a panel according to the present invention,

Figure 2 is a process diagram schematically showing a manufacturing process of the panel according to the present invention,

3 is a cross-sectional view showing a panel manufacturing apparatus of the present invention,

Figures 4a to 4d sequentially shows the operating state of the needle-like air inlet at the time of air injection into the opening of the lower skin and lower heating sheet and the hollow panel of the present invention

For reference only,

Figure 5a is a reference diagram showing a state of the needle-like air inlet in the opening state of the lower skin and lower heating sheet in another embodiment of the present invention,

5B is a reference diagram showing a state of a needle-shaped air inlet when air is injected into a hollow portion of a panel according to another embodiment of the present invention.

Figure 5c is a reference diagram showing the state of the needle-shaped air inlet in another embodiment of the present invention,

6 is a cross-sectional view showing a conventional panel manufacturing apparatus,

7 is an enlarged reference view of a perspective view and side surfaces of a conventional panel.

The apparatus for manufacturing a hollow molded synthetic resin panel of the present invention, as shown in Figure 3, the upper mold (1) capable of pressing and cooling the upper skin material 61 and the upper heating sheet 62 of the upper panel 6 And a lower mold (2) capable of pressurizing and cooling the lower skin material (71) and the lower heating sheet (72) of the lower panel (7), between the upper and lower panels at the center of the lower mold (2). The hollow molded part 21 of the groove shape for creating the hollow part 73 of the panel is provided, and the upper and lower parts of the bottom part 21a of the hollow molded part 21 can be moved forward and backward. The needle-shaped air inlet (3) of the structure is provided, the needle-shaped air inlet (3) is a hollow structure, the inlet 34 is capable of moving forward, backward, rotation, and rotates, the lower part mentioned above Opening, through and through the lower skin material 71 and the lower heating sheet 72 of the panel (7)

In order to inject air from the outside, the air cylinder 32 is mounted to the outside of the body 31 of the needle-shaped air inlet (3), the hollow guide for moving and air inlet on the bottom of the body 31 (35) is installed, the body 31 of the needle-shaped air inlet (3) by the air cylinder 32 and the guide 35 is capable of moving forward and backward, the body

Rotating motor 33 is installed at the upper end of the interior 31, the inlet 34 is rotatable, the guide 35 is connected to the compressor (4) that is installed outside the computer External compressed air flowing from the Lesser 4 can be introduced into the hollow molding part 21 through the injection hole 34.

In addition, the air intakes 22 and 22 'are formed at the left and right ends of the hollow mold 21 of the lower mold 2 at both left and right ends 21' and 21 &quot;, respectively. ') Is connected to the suction suction pumps 5 and 5' installed in the outside, and the air is blown from the hollow molding part 21 to maintain the hollow molding part 21 in a vacuum state to advance the air inlet. , The lower skin material 71 and the lower heating sheet 72 mounted on the lower mold 2 are brought into close contact with the hollow mold 21 of the lower mold 2, and the outer surface of the lower mold 2. Clamping 25 and 25 'are installed on the left and right sides of the upper end to maintain a vacuum state between the lower heating sheet 72 and the lower mold 2 of the hollow molding portion 21. The upper and lower molds Cooling pipes 11, 11 ', 23, 23' having a structure in which cooling water flows are installed on the inner surface of (1, 2). After pressing, the upper and lower molds (1, 2) are cooled to cool the end. Blow molded product Board 10 is gold to be cooled.

Next, as shown in Figures 4a and 4c, the lower skin material 71 and the lower heating sheet

The operation state and sequence of the needle-shaped air inlet 3 at the time of opening the air and the air inlet into the hollow portion 73 of the panel will be described sequentially.

1) As shown in Figure 4a, the lower skin material 71 and the lower heating sheet 72 is mounted on the upper portion of the hollow molding portion 21 of the lower mold (2), wherein the needle-shaped air inlet (3) The injection hole 34 is located lower than the bottom surface 21a of the hollow molding portion 21.

2) As shown in FIG. 4B, the ends 21 'and 21 "of the hollow molding bottom surface 21a of the lower mold 2 are connected to the external suction pumps 5 and 5'. The air intakes 22 and 22 ′ suck the air from the blow molded part 21 to maintain the blow molded part 21 in a vacuum, so that the lower skin material 71 and the lower heating sheet 72 are blow molded. The lower surface 21a and the lower heating sheet are brought into close contact with the bottom surface 21a of the 21, and the close contact with the needle-shaped air inlet 3 is made.

After opening and penetrating 72, it advances in the direction of the upper mold 1 of length more than the height of a hollow molding part side wall.

3) As shown in FIG. 4C, after the needle-shaped air inlet 3 retreats to the center of the height of the side wall of the hollow molding part 21, the compressed air introduced from the external compressor 4 is blown. It is allowed to flow into the inside of the portion 21, so that the hollow portion 73 of the panel by the press operation of the upper heating sheet 62 and the upper skin material 61 is generated and maintained.

As described above, the manufacturing apparatus of the present invention is installed in the needle-shaped air inlet (3) capable of moving forward and backward and air intake at both ends (21 ', 21 ") of the hollow molded part 21 of the lower mold (2) (22,

22 '), the air of the blow molding portion 21 is sucked to the outside through the air suction portion 21', 21 "to keep the blow molding portion 21 in a vacuum state so that the lower skin material ( 71) and the lower heating sheet 72 can be in close contact with each other, so that the nozzle hole 75 due to the use of the nozzle 74 for air injection of the hollow portion 73 of the conventional panel does not occur at the side of the product at all. It is.

If necessary, as shown in Figure 3, outside the lower mold (2) in addition to the manufacturing apparatus

Supports 24 and 24 'are installed at left and right portions of the upper end to press the upper and lower molds 1 and 2 and to open the lower skin 61 and the lower heating sheet 62. The upper and lower molds may prevent the flow from occurring, and as shown in FIGS. 5A and 5B, the lower skin material 71 and the lower heating sheet (not provided with the air suction parts 22 and 22 ′) are provided. After opening, through, and opening, through using the needle-shaped air inlet 3 of the present invention in a state in which 72 is positioned on the upper part of the hollow molding part 21, the needle-shaped air inlet 3 is formed into a lower mold ( Compressed air may be injected into the hollow molding portion 21 in a state in which the hollow portion 21 is reversed to the central portion of the hollow molding portion 21. As shown in FIG. 5C, the needle-shaped air inlet 3 is blown. part

After opening and penetrating the lower skin material 71 and the lower heating sheet 72 by advancing toward the upper mold 1 at an angle of about 10 to 15 ° from both side surfaces of the lower surface 21a of the bottom of the 21. , Is formed of a plurality of or multiple needle-like air inlet (3 ', 3 ") to be reversed to the central portion of the side wall height of the hollow molded part 21 to inject compressed air into the hollow molded part 21 In addition, the plurality of or a plurality of needle-like air inlet (3 ', 3 ") are respectively inserted into the upper both sides of the lower heating sheet 72 mounted on the lower mold (2), the external compressor

While supplying 1 kg / cm 2 of compressed air supplied from (4), the upper heating sheet 62 and the upper skin material 61 may be laminated to press molding, and the needle-shaped air inlet 3 may be pressed. The needle-type air inlet 3 may be rotated by attaching other devices capable of rotation to the outside of the air cylinder 32 without using the rotation motor 33 for rotation.

Next, a method for manufacturing a panel using the manufacturing apparatus of the present invention will be described in detail. As shown in FIG. 2, the method is manufactured by the following manufacturing method and working procedure.

1) After attaching the lower skin material 71 composed of materials such as fibers, non-woven fabrics, imitation leather, and plastic film to the lower mold 2 of the manufacturing apparatus, the lower heating sheet heated to 180 ± 20 ° C in an oven ( 72) is positioned on the upper surface of the lower skin material 71 and then the lower heating sheet 72 and the lower skin material to the lower mold (2) by clamping (25, 25 ').

2) The hollow of the lower mold 2 through the air suction portions 22 and 22 'mounted at both ends 21' and 21 "of the left and right ends of the hollow mold 21 of the lower mold 2; The air in the molding part 21 is sucked to the outside at a pressure of 1 kg / cm 2, and the hollow molding part 21 is made to form a vacuum, so that the lower skin material 71 and the lower heating sheet 72 are blown. It comes in close contact with the bottom face 21a of the part 21.

3) After the lower skin 71 and the lower heating sheet 72 are completely adhered to the bottom surface 21a of the hollow molding portion 21, they are formed at the lower end of the bottom surface 21a of the hollow molding portion of the lower mold 2. The lower skin member 71 and the lower heating sheet 72 are needle-type air by rotating and advancing the needle-shaped air inlet 3 equipped with the air cylinder 32 and the rotary motor 33 thereon. After the inlet (3) rotates to open and penetrate at a high speed, the hollow molded part of the lower mold (2)

(21) To be reversed inside and to be located.

In the above operation, the needle-shaped air inlet 3 is opened and penetrated through the lower skin material 71 and the lower heating sheet 72 in the direction of the upper mold 1 having a length greater than or equal to the height of the side wall of the hollow molding part 21. After advancing forward, the air is compressed back due to a problem such that the lower heating sheet 72 blocks the inlet 34 of the needle-shaped air inlet 3 by reversing to the central position of the height of the side wall of the hollow molding part 21. When the hollow portion 73 of the panel is not introduced, the lower skin material 71 and the lower heating sheet 72 are prevented from being defective due to a phenomenon such as sagging.

4) After being positioned at the center of the height of the side wall of the hollow molded part 21, the compression is introduced into the air pressure of 1 kg / ㎠ from the external compressor (4) through the injection hole 34 of the end of the needle-type air inlet (3) At the same time, the air is injected into the blow molding part 21, and the upper heating sheet 62 heated to 180 ± 20 ° C is mounted on the lower sheet 72, and the upper skin material is attached to the upper heating sheet.
(62) After laminating on the upper portion, press for 0.5 to 2 minutes at a pressure of 3 kg / ㎠.

At the time of pressing, the upper and lower molds 1 and 2 are provided with cooling pipes 23 and

23 '), the cooling water of 0 to 20 ° C circulates to cool the upper and lower heating sheets 62 and 72 to 60 ° C or lower, and the needle-shaped air inlet 3 to the bottom surface 21a of the hollow molding part 21. After removing the reverse and pressure to the lower end of the), and demolded to form a synthetic resin panel (10) having a hollow part as a final product

Manufacture.

In manufacturing a synthetic resin panel having a hollow portion using the manufacturing apparatus and a manufacturing method using the same, the present invention, in particular, the air panel using the needle-shaped air inlet (3) when manufacturing the hollow portion 73 of the panel panel It is formed in a structure that flows into the hollow portion 73 of the conventional integration of the nozzle hole 75 of the nozzle cross-sectional area size due to the use of the nozzle 74 on the outer surface, such as the side of the lower heating sheet 72 is not generated. The technical idea that can manufacture a panel and the needle-shaped air inlet (3) is rotated by the air cylinder 32 and the rotary motor 33 and formed to be moved up and down to the lower skin material (71) ) And the upper mold having a length greater than or equal to the height of the side of the hollow molding portion 21 by opening and penetrating the lower heating sheet 72.

After moving forward and forward in the direction (1), the center of the hollow molding part 21 is moved to the center position so that the compressed air supplied from the external compressor 4 can flow into the hollow part 73 of the panel. The air intakes 22, 22 formed at both ends 21 ', 21 "of the bottom face 21a of the hollow molding part 21 of the lower mold 2 are made into the main part of this invention as the main part of this invention. By sucking the air in the hollow molding portion 21 through ') to maintain the hollow molding portion 21 in a vacuum state, the lower skin material 71 and the lower heating sheet 72 is hollow of the lower mold (2) It is formed in a structure that can be molded while being in close contact with the bottom surface 21a of the molding portion 21, so that air is injected into the lower skin material 71 and the lower heating sheet 72 so that the hollow portion 73 of the panel is formed. The present invention relates to a manufacturing apparatus of a hollow molded synthetic resin panel capable of preventing product defects such as crushing, and a method of manufacturing a panel using the same. The people in recess.

As described above, the present invention by using the apparatus for manufacturing a hollow molded synthetic resin panel and a method for manufacturing a panel using the same, to produce a synthetic resin panel formed with a hollow portion, the outer surface such as the side of the finished hollow molded panel It is possible to manufacture a hollow molded panel in which the entire panel without nozzle holes for air injection, etc. can be manufactured, and the air injection holes on the side of the product are generated due to the use of nozzles for conventional air injection. It is possible to solve the problems such as product breakage due to the decrease in strength of the air inlet, deterioration of the appearance of the product due to the occurrence of the air injection hole, accumulation of foreign substances, odor generation, and impossibility of cleaning. In particular, by injecting air using the needle-shaped air inlet of the manufacturing apparatus of the present invention The hollow part is easily formed, and the air inlet part sucks air in the hollow molding part of the lower mold and maintains the lower part of the hollow molding part in a vacuum state, while the lower skin material and the heating sheet are in close contact with the lower mold. By molding, it completely prevents the occurrence of product defects due to the phenomenon that the lower skin material and the heating sheet do not penetrate, which is a problem in forming the upper and lower panels according to the prior art, and at the same time, joins the upper panel and the lower panel. It is easy to work and is a very innovative invention that can bring about the effect of improving the bonding strength.

Claims (9)

In constructing the apparatus for manufacturing a hollow molded synthetic resin panel, the upper and lower skin materials (61,71) and the upper and lower heating sheet (62, 72) is mounted to the lower mold (2) and consists of an apparatus for press molding by the upper and lower molds (1,2), Inside the lower mold 2, a hollow molding portion 21 capable of molding the hollow portion 73 of the panel is provided, and both end portions 21 of the bottom surface 21a of the hollow molding portion 21 are provided. ', 21') are provided with air suction portions 22, 22 'for sucking the internal air of the blow-molded portion 21; On the left and right sides of the upper end of the outer mold 2, the lower heating sheet 72 and the lower skin material 71 and the lower mold 2 for tightening the vacuum efficiency of the hollow molding part 21 can be tightened. Clamping (25, 25 ') is installed, An injection hole 34 capable of opening, penetrating, and injecting air into the lower skin material 71 and the lower heating sheet 72 mounted on the lower mold 2 at the lower end of the bottom of the hollow molding part 21. Consists of a body 31, the air cylinder 32 is mounted on the outside of the body 31 for the forward, backward to the upper, lower, the hollow guide 35 on the bottom of the body 31 Is installed, the rotary motor 33 is installed on the inner top of the body 31, the needle-shaped air inlet (3) of the structure that can rotate forward and backward, air injection to the upper and lower parts are installed Apparatus for producing a blow molded synthetic resin panel, characterized in that. The upper mold according to claim 1, wherein the needle-shaped air inlet 3 is located at a lower end portion of the bottom face 21a of the hollow molding part 21 and has a height greater than or equal to the height of the side surface of the hollow molding part 21. (1) the apparatus for producing a blow molded synthetic resin panel, characterized in that it is installed in the direction of the needle-shaped air inlet (3) to be forward and backward to the central position of the side of the hollow molded part (21). According to claim 1, wherein the needle-shaped air inlet (3) the upper side of the height of the side length of the hollow molding portion 21 while maintaining an angle of 10 to 15 ° from both sides of the lower end of the bottom surface 21a of the hollow molding portion (21) Blow molding characterized in that it can be installed as a plurality or a plurality of needle-shaped air inlet (3 ', 3 ") to be advanced in the mold (1) direction and the reverse to the central position of the side height of the hollow molding portion 21 Apparatus for manufacturing synthetic resin panel. delete The method of claim 1, wherein the air intake portion 22, 22 'is connected to an external suction pump (5, 5') is installed so as to suck the air in the hollow molding portion 21 Apparatus for manufacturing molded synthetic resin panel. The method of claim 1, wherein the needle-shaped air inlet (3) is connected to the external compressor (4), the compressed air supplied from the compressor (4) in the hollow molding portion 21 of the lower mold (2) Apparatus for manufacturing hollow molded synthetic resin panel, characterized in that it is installed to be injected. The upper and lower skin materials 61 and 71 and the upper and lower heating sheets 62 and 72 are mounted on the lower mold 2, and then blow molded by the upper and lower molds 1 and 2 to form a hollow resin. In the manufacturing method for manufacturing a panel, after mounting the lower skin material 71 and the lower heating sheet 72 heated to 180 ± 20 ℃ to the lower mold (2), clamping of the left and right parts of the upper upper surface A vacuum is formed on the bottom surface 21a of the hollow part 21 in the lower mold 2 by tightening the lower heating sheet 72, the lower skin material 71, and the lower mold 2 to (25, 25 '). The lower skin material 71 and the lower heating sheet 72 are sucked to the outside through the air suction parts 22 and 22 'at a pressure of 1 kg / cm 2. The bottom surface material 71 and the bottom heating sheet 72 are completely in close contact with the bottom surface 21a of the hollow molding part 21 and then using the needle-type air inlet 3 of the needle-type air injection method. Opening, After Penetration After the hollow portion 21 is positioned at the center of the height, the hollow 1kg / cm 2 compressed air introduced from the external compressor 4 through the inlet 34 of the needle-shaped air inlet 3 is hollowed out. After the injection into the molding unit 21, the upper heating sheet 62 and the upper skin material 61 is heated to 180 ± 20 ℃ on the upper portion of the lower heating sheet 72, press forming and lower mold Cooling water of 0 ~ 20 ℃ is circulated to the cooling pipes 23 and 23 'installed in the cooling pipes to cool and demold the upper and lower heating sheets 62 and 72 to 60 ℃ or lower to remove the hollow molded panel 10. The manufacturing method of the hollow molded synthetic resin panel, characterized in that it is possible to manufacture an integrated panel in which the nozzle hole (75) is not generated on the outer surface, such as the side of the hollow molded panel (10). The method according to claim 7, wherein the needle-shaped air inlet (3) opens the lower skin material 71 and the lower heating sheet 72, and when opening the lower skin material (71) and the lower heating sheet (72) And in the penetrating state to advance in the direction of the upper mold (1) of the height or more than the height of the side wall of the hollow molding portion 21, and then backward to the center position of the height of the side wall of the hollow molding portion 21 to lower the heating sheet A method of manufacturing a blow molded synthetic resin panel, characterized in that (72) can prevent clogging the inlet (34) of the needle-shaped air inlet (3). 8. The lower skin material according to claim 7, wherein the air intakes (22, 22 ') are not provided. (71) and the lower heating sheet 72 can be opened and penetrated using the needle-shaped air inlet (3) in the state located on the upper portion of the hollow molding portion 21 of the lower mold (2) Method for producing a blow molded synthetic resin panel.

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