JP2011115952A - Method for manufacturing foamed molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a foamed molding which prevents the occurrence of warpage and is superior in strength. <P>SOLUTION: The foamed molding manufacturing method for manufacturing the foamed molding 40 from a foaming parison includes an extrusion process S1 in which a mixed resin comprising a blowing agent and a thermoplastic resin is extruded to form the sheet-shaped foaming parison, a mold clamping process S2 in which the sheet-shaped foaming parison is held between a pair of split molds 13 to be sealed, a supporting process S3 in which the sheet-shaped foaming parison 20 is supported in the split molds 13, and a suction process S4 in which air in the split molds 13 is sucked to carry out decompression. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for producing a foamed molded product, and more particularly to a method for producing a foamed molded product having no strength and excellent strength.

  Foamed molded products are lightweight and excellent in rigidity, and are therefore used in various fields such as automobiles, aircrafts, vehicles / ships, building materials, housings for various electric devices, sports and leisure.

  As a method for producing a foamed molded product, for example, a polymer mainly composed of a thermoplastic resin is melt-kneaded in an extrusion molding machine, then extruded from a circle-shaped die, formed into a sheet, and then transported on a transport table. A method is known in which vacuum suction is performed by a vacuum suction device to perform secondary foaming to obtain a foamed molded body (for example, see Patent Document 1).

Also, there is a method of obtaining a foamed molded article by placing a softened cylindrical molded article (parison) having a thermoplastic resin foam layer between molds, and sandwiching the cylindrical molded article between the molds and compressing. Known (for example, see Patent Document 2, Patent Document 3 or Patent Document 4).
In these methods, a foam-molded article is produced by blowing gas into the parison and / or reducing the pressure between the parison outer surface and the mold inner surface.

Japanese Patent Laid-Open No. 10-58533 JP 2003-236918 A JP 2004-82332 A JP 2004-284149 A

However, in the method for producing a foam molded article described in Patent Documents 1 to 4, when the parison is sandwiched between molds and gas is blown into the mold or the inside of the mold is decompressed, as shown in FIG. In some cases, the parison adheres to one of the divided molds. If it does so, since the one side of the attached parison will be cooled previously and solidification will start, the foaming molding with which the foam density was biased will be obtained.
Further, when the parison is inflated after being attracted to one of the divided molds, the parison will inflate to the other side. If it does so, curvature will arise in the foaming molding which became a product, or intensity, such as impact resistance, will become insufficient.

  This invention is made | formed in view of the said situation, and it aims at providing the manufacturing method of the foaming molding which does not produce curvature and is excellent in intensity | strength.

  The inventors of the present invention have intensively studied to solve the above problems, and found that the above problems can be solved by providing a supporting step of supporting the sheet-like foamed parison in the split mold, and the present invention is completed. It came.

  That is, the present invention is (1) a method for producing a foam-molded product that produces a foam-molded product from a foam parison, and an extrusion process in which a mixed resin containing a foaming agent and a thermoplastic resin is extruded to form a sheet-like foam parison. And a mold clamping step for sandwiching and sealing the sheet-like foamed parison between the pair of split molds, a supporting step for supporting the sheet-like foamed parison in the split mold, and reducing the pressure by sucking air in the split mold And a suction step.

  This invention exists in the manufacturing method of the foaming molding of the said (1) description which (2) sheet-like foam parison consists of 1 sheet, and thickness is 1 mm or more.

  This invention exists in the manufacturing method of the foaming molding of the said (1) description to which (3) a mold clamping process and a support process are performed simultaneously.

  The present invention is as described in any one of (1) to (3) above, wherein (4) the divided mold is provided with a protrusion, and the protrusion supports the sheet-like foamed parison in the divided mold. It exists in the manufacturing method of a foaming molding.

  According to the present invention, (5) any one of the above (1) to (3), wherein the split mold is provided with a slidable slide core, and the slide core supports the sheet-like foam parison in the split mold. It exists in the manufacturing method of the foaming molding as described in one.

  The present invention provides the foam molded article according to any one of (1) to (5), wherein air is blown into the split mold from an air port provided in the split mold in the (6) mold clamping step. Lies in the way.

In the method for producing a foamed molded product of the present invention, since the sheet-shaped foamed parison is supported in the split mold, the sheet is provided even if the air in the split mold is sucked and decompressed in the suction process. The foamed parison is restrained from adhering to one of the divided molds and is supported at a predetermined position. For this reason, when the sheet-like foam parison is expanded in the suction process, a foamed molded article having a uniform foam density is obtained without warping.
Therefore, according to the method for producing a foamed molded product of the present invention, a foamed molded product that does not warp and has excellent strength such as impact resistance can be obtained.
Moreover, the drawdown of a sheet-like foaming parison can be prevented by providing a support process.

In the method for producing a foamed molded product of the present invention, when the sheet-like foam parison is composed of one sheet, the foam density in the thickness direction of the foamed molded product is more uneven than that obtained by laminating a plurality of foamed parisons. Can be suppressed.
Moreover, the process of laminating a plurality of foamed parisons is not necessary and can be manufactured efficiently.
Here, when the number of foam parisons is one, the thickness is preferably 1 mm or more.

In the manufacturing method of the foaming molding of this invention, when a mold clamping process and a support process are performed simultaneously, it can suppress that a sheet-like parison adheres to one division | segmentation metal mold | die in a mold clamping process.
Further, the manufacturing cost can be reduced.

  In the method for producing a foamed molded article of the present invention, the split mold is provided with protrusions, and when the protrusions support the sheet-like foam parison in the split mold, the protrusions of the split mold are foam-molded. The means for forming the recesses on the body surface serves as the means for supporting the foamed molded article. For this reason, the foaming molding by which the recessed part was formed in the surface with a simple structure can be manufactured.

In the method for producing a foamed molded article of the present invention, the split mold is provided with a slidable slide core. When the slide core supports the sheet-like foam parison in the split mold, the slide core slides. By adjusting the condition, the width for sandwiching the sheet parison can be freely adjusted.
The slide core can also serve as a means for forming a recess on the surface of the foam molded body and a means for supporting the foam molded body. On the other hand, the slide core is pulled at the same time as the sheet-like foam parison is inflated. Therefore, it is possible not to form the recess in the sheet-like foamed parison.

  In the method for producing a foamed molded article of the present invention, when air is blown into the split mold from the air port provided in the split mold in the mold clamping step, for example, a sheet-like foam parison stacks a plurality of foam parisons. In the case where it is, the adhesion between the foamed parisons can be improved.

FIG. 1 is a flowchart showing a method for manufacturing a foam molded article according to the first embodiment. FIG. 2 is a cross-sectional view schematically showing a state in which a single foam parison is extruded between a T die and a split mold in the method for producing a foam molded body according to the first embodiment. FIG. 3 is a cross-sectional view schematically showing a state in which the single foam parison is supported and sealed in the method for producing a foam molded body according to the first embodiment. FIG. 4 is a cross-sectional view schematically showing a state in which a single foam parison is subjected to a suction step and bulged in the method for manufacturing a foam molded body according to the first embodiment. FIG. 5 is a perspective view showing a foam molded body obtained by the method for manufacturing a foam molded body according to the first embodiment. FIG. 6 is a flowchart showing a method for manufacturing a foam molded article according to the second embodiment. FIG. 7 is a cross-sectional view schematically showing a state in which the single foam parison is sealed in the method for manufacturing a foam molded body according to the second embodiment. FIG. 8 is a cross-sectional view schematically showing a state in which a single foam parison is supported in the method for producing a foam molded body according to the second embodiment. FIG. 9 is a cross-sectional view schematically showing a state in which the sheet-like foam parison has been subjected to a suction step and bulged in the method for producing a foam molded article according to the second embodiment. FIG. 10 is a cross-sectional view schematically showing a state in which a foamed parison is brought into close contact with each other using a pressure roller in a method for producing a foamed molded product according to another embodiment to form a composite foamed parison. FIG. 11: is sectional drawing which shows typically the state by which the single-piece | mold foam parison was supported using the slide core in the manufacturing method of the foaming molding which concerns on other embodiment. FIG. 12 is a cross-sectional view schematically showing a foamed product manufactured by a conventional method for manufacturing a foamed molded product.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary. In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

[First Embodiment]
As a first embodiment of the method for producing a foamed molded product according to the present invention, a case where one foamed parison is used will be described.
FIG. 1 is a flowchart showing a method for manufacturing a foam molded article according to the first embodiment.
As shown in FIG. 1, the manufacturing method of the foaming molding which concerns on 1st Embodiment is the extrusion process S1 which extrudes the mixed resin containing a foaming agent and a thermoplastic resin, and makes it a foaming parison, and a pair of division | segmentation of a foaming parison A mold clamping step S2 that is sandwiched between molds and sealed to form a sheet-like foamed parison, a support step S3 that supports the sheet-like foamed parison in the divided mold, and air in the divided mold is sucked A suction step S4 for reducing the pressure. In addition, in the manufacturing method of the foaming molding which concerns on 1st Embodiment so that it may mention later, mold clamping process S2 and support process S3 are performed simultaneously. That is, the extrusion step S1, the mold clamping step S2, the support step S3 (simultaneous), and the suction step S4 are performed in this order.

According to the above method for producing a foamed molded product, it is possible to produce a foamed molded product that does not warp and has excellent strength such as impact resistance.
Hereinafter, each process will be described in more detail.

(Extrusion process)
The extrusion step S1 is a step of extruding a mixed resin containing a foaming agent and a thermoplastic resin from an extrusion port to form a single sheet-like foam parison (hereinafter referred to as “single foam parison” for convenience).

In the method for manufacturing a foamed molded product according to the first embodiment, since the single foamed parison is composed of one sheet, the thickness of the foamed molded product is larger than that of a sheet-shaped foamed parison laminated with a plurality of foamed parisons. The deviation of the foam density in the direction can be suppressed.
Moreover, the process which laminates | stacks and closely_contact | adheres a some foaming parison is unnecessary, and can manufacture efficiently.

Here, the thickness of the single foam parison is preferably 1 mm or more. When the thickness is less than 1 mm, compared to the case where the thickness is within the above range, foaming does not occur sufficiently, and the strength such as impact resistance tends to decrease. Also, pinholes are likely to occur.
The thickness is more preferably 20 mm or less. In this case, the drawdown of the single foam parison can be suppressed.

FIG. 2 is a cross-sectional view schematically showing a state in which a single foam parison is extruded between a T die and a split mold in the method for producing a foam molded body according to the first embodiment.
In the extrusion step S <b> 1, first, a mixed resin that is a so-called supercritical fluid in which a thermoplastic resin and a foaming agent are mixed is kneaded by an extruder (not shown) and temporarily stored in the accumulator 43 of the accumulator 42. Thereafter, the sheet is supplied to the T die 41 by a plunger (not shown) at regular intervals, and one sheet-like foam parison 20 is extruded from the T die 41. The mixed resin is extruded from the T-die 41 and the mixed resin is foamed at the same time as the foamed parison 20. The foam parison 20 is sandwiched between a pair of rollers 44 and guided between the divided molds.

Here, the material of the single foamed parison will be described.
Examples of the thermoplastic resin include polyolefin resins such as polyethylene resin and polypropylene resin.
Among these, the thermoplastic resin preferably has a propylene unit, and specific examples thereof include a propylene homopolymer, an ethylene-propylene block copolymer, and an ethylene-propylene random copolymer.
Further, among these, a propylene homopolymer having a long chain branched structure is particularly preferable. In this case, since melt tension becomes high, it becomes easy to foam and a bubble cell is made more uniform.

  The propylene homopolymer having a long chain branched structure is preferably a propylene homopolymer having a weight average branching index of 0.9 or less. The weight average branching index g ′ is represented by V1 / V2, where V1 is the intrinsic viscosity of the branched polyolefin and V2 is the intrinsic viscosity of the linear polyolefin having the same weight average molecular weight as the branched polyolefin.

  The thermoplastic resin is preferably a polypropylene resin having a melt tension at 230 ° C. in the range of 30 to 350 mN. Here, melt tension means melt tension. When the melt tension is within the above range, the foaming polypropylene resin exhibits strain-hardening properties, and a high foaming ratio can be obtained.

The thermoplastic resin preferably has a melt flow rate (MFR) of 1 to 10 at 230 ° C. Here, MFR is a value measured according to JIS K-7210.
If the MFR is less than 1, it tends to be difficult to increase the extrusion speed as compared with the case where the MFR is in the above range. If the MFR exceeds 10, the MFR is in the above range. In comparison, blow molding tends to be difficult due to the occurrence of drawdown or the like.

  It is preferable to further add a styrene elastomer and / or low density polyethylene to the mixed resin. When a styrene elastomer or low-density polyethylene is added, the impact strength at low temperature of the foamed molded product is further improved.

Although it does not specifically limit as a styrene-type elastomer, What is necessary is just an elastomer which has a styrene unit to which hydrogen was added in the molecule | numerator. Examples thereof include hydrogenated elastomers such as styrene-ethylene / butylene-styrene block copolymers, styrene-ethylene / propylene-styrene block copolymers, and styrene-butadiene random copolymers.
The blending ratio of the styrenic elastomer is preferably in the range of less than 40 wt% with respect to the thermoplastic resin from the viewpoint of moldability.
In addition, the content of styrene in the styrene-based elastomer is preferably less than 30 wt%, more preferably less than 20 wt%, from the viewpoint of impact strength at low temperatures.

As the low density polyethylene, those having a density of 0.91 g / cm ³ or less are suitably used from the viewpoint of impact strength at low temperatures. In particular, it is preferable to use linear ultra-low density polyethylene polymerized by a metallocene catalyst.
The blending ratio of the low density polyethylene is preferably in the range of less than 40 wt% with respect to the thermoplastic resin from the viewpoint of rigidity and heat resistance.

  In addition to the styrene-based elastomer, low-density polyethylene, and foaming agent, a nucleating agent, a coloring agent, and the like may be added to the mixed resin.

Examples of the foaming agent include inorganic foaming agents such as air, carbon dioxide gas, nitrogen gas, and water, or organic foaming agents such as butane, pentane, hexane, dichloromethane, and dichloroethane.
Among these, it is preferable to use air, carbon dioxide gas or nitrogen gas as the foaming agent. In this case, there is no mixing of organic substances, and there is no decrease in durability or the like.

  Moreover, it is preferable to use a supercritical fluid as the foaming method. In particular, it is preferable that carbon dioxide gas or nitrogen gas is in a supercritical state to foam the mixed resin. In this case, it can foam uniformly and reliably. The nitrogen supercritical fluid is obtained by setting nitrogen to a critical temperature of 149.1 ° C. and a critical pressure of 3.4 MPa or more, and the carbon dioxide supercritical fluid is carbon dioxide to a critical temperature of 31 ° C. and a critical pressure. It is obtained by setting it to 7.4 MPa or more.

(Clamping process and support process)
The mold clamping step S2 is a step in which the sheet-shaped foam parison is sandwiched between a pair of split molds and sealed, and the support step S3 is a process in which the sheet-shaped foam parison is supported in the split mold.

FIG. 3 is a cross-sectional view schematically showing a state in which the single foam parison is supported and sealed in the method for manufacturing a foam molded body according to the first embodiment.
As shown in FIG. 3, in the method for manufacturing a foam molded body according to the first embodiment, the single foam parison 20 is clamped and sealed.
At this time, the split mold 13 is provided with a protrusion 13 a, and the protrusion 13 a supports the single foam parison 20 in the split mold 13.

Thereby, it is suppressed that the single-piece | mold foam parison 20 adheres to the one division | segmentation metal mold | die 13 biased.
In addition, since the single foam parison 20 is supported by the protrusions 13a, it is possible to prevent the single foam parison 20 from being drawn down.

In the method for manufacturing a foamed molded product according to the first embodiment, the mold clamping step S2 and the support step S3 are performed simultaneously, so that the manufacturing cost can be reduced.
Further, the protrusion 13 a of the split mold 13 serves as a means for forming a recess on the surface of the single foam parison 20 and a means for supporting the single foam parison 20. For this reason, it becomes possible to manufacture the foaming molding by which the recessed part was formed in the surface by simple structure.

(Suction process)
The suction step S4 is a step in which the single foamed parison 20 is supported by the protrusions 13a and the air in the split mold 13 is sucked and decompressed while being sealed between the split molds 13.

FIG. 4 is a cross-sectional view schematically showing a state in which a single foam parison is subjected to a suction step and bulged in the method for manufacturing a foam molded body according to the first embodiment.
As shown in FIG. 4, in the suction step S <b> 4, air in the split mold 13 is sucked from an air port 13 b provided in the split mold 13. Thereby, since the air pressure in the sealed space in the divided mold 13 is lowered, the single foam parison 20 bulges toward the air port 13b. At the same time, bubbles grow and the volume of the single foam parison 20 increases.
In this way, a foaming molding is obtained.

  In the method for manufacturing a foam molded body according to the first embodiment, even if the air in the split mold 13 is sucked and reduced in the suction step S4, the single foam parison 20 is supported by the protrusions 13a. Adhering to the split mold is suppressed. For this reason, when the single-piece | mold foam parison 20 is expanded, a curvature does not arise and the foaming molding with a uniform foam density is obtained.

Next, the foam molded article will be described.
FIG. 5 is a perspective view showing a foam molded body obtained by the method for manufacturing a foam molded body according to the first embodiment.
As shown in FIG. 5, the foamed molded body 40 has a recess formed on the surface. Thereby, weight reduction is achieved. In addition, the foamed molded body 40 has a uniform foam density, does not warp, and has excellent strength such as impact resistance.

  The foamed molded body 40 has a closed cell structure including a plurality of cell cells. Here, the closed cell structure is a structure having a plurality of bubble cells, and means a structure having at least 50% of closed cells. Therefore, the surface smoothness is excellent.

The bubble cell preferably has an average bubble diameter of less than 1000 μm, and more preferably less than 500 μm. Here, the average bubble diameter means an average value of the maximum diameters of many bubbles.
When the average bubble diameter is 1000 μm or more, the surface roughness tends to be large and the surface smoothness tends to be inferior compared with the case where the average bubble diameter is within the above range.

  The foamed molded product 40 is a highly foamed molded product, and has an expansion ratio of 3.0 to 20 times. Here, the expansion ratio is a value obtained by dividing the density of the thermoplastic resin by the apparent density of the foam molded article.

The foamed molded body 40 is suitably used as a foam core material. Specifically, it is a flexural rigidity or bending for automobiles, aircrafts, vehicles / marine vessels, building materials, housings of various electric devices, sports / leisure. Used for structural members that resist buckling.
Especially when used as automotive structural members such as cargo floor boards, deck boards, rear parcel shelves, roof panels, door trims, interior panels, door inner panels, platforms, hardtops, sunroofs, bonnets, bumpers, floor spacers, devia pads, etc. Since the weight of an automobile can be measured, fuel efficiency is improved.

[Second Embodiment]
2nd Embodiment of the manufacturing method of the foaming molding which concerns on this invention is described.
FIG. 6 is a flowchart showing a method for manufacturing a foam molded article according to the second embodiment.
As shown in FIG. 6, the manufacturing method of the foam molded body according to the second embodiment is the first except that the mold clamping step S5 and the support step S6 are separate steps and the types of the divided molds are different. It is the same as that of the manufacturing method of the foaming molding which concerns on embodiment. That is, the extrusion process S1, the mold clamping process S5, the support process S6, and the suction process S7 are performed in this order.

(Clamping process)
In the mold clamping step S5, similarly to the mold clamping step S2 in the method for manufacturing a foam molded body according to the first embodiment, the foam parison is sandwiched between a pair of split molds, and the mold is sealed and clamped to obtain a sheet-like foam parison. It is a process.

FIG. 7 is a cross-sectional view schematically showing a state in which the single foam parison is sealed in the method for manufacturing a foam molded body according to the second embodiment.
As shown in FIG. 7, in the method for manufacturing a foam molded body according to the first embodiment, a single foam parison 20 is clamped and sealed with a split mold 14. At this time, the split mold 14 is provided with a slidable slide core 14a.

(Support process)
The support step S6 is a step of supporting the sheet-like foam parison in the split mold.
FIG. 8 is a cross-sectional view schematically showing a state in which the single foam parison 20 is supported in the method for manufacturing a foam molded body according to the second embodiment.
From the state in which the single foam parison 20 shown in FIG. 7 is clamped by the split mold 14, as shown in FIG. 8, the slide core 14 a is slid to support the outer wall surface of the single foam parison 20.
Thereby, it is suppressed that the single-piece | mold foam parison 20 adheres to one division | segmentation metal mold | die 14 biased.

In addition, since the single foam parison 20 is supported by the slide core 14a, the draw down of the single foam parison 20 can be prevented.
Furthermore, there is an advantage that the width of sandwiching the single foam parison 20 can be freely adjusted by adjusting the slide condition of the slide core 14a.
Furthermore, by providing a plurality of slide cores 14a, it is possible to serve as a means for forming a recess on the surface of the single foam parison 20 and a means for supporting the single foam parison 20. Note that the split mold may have a protrusion separately.

(Suction process)
The suction step S7 is a step in which the single foam parison 20 is supported by the slide core 14a and the air inside the split mold 14 is sucked and decompressed while being sealed between the split molds 14.

FIG. 9 is a cross-sectional view schematically showing a state in which a single foam parison is subjected to a suction step and bulged in the method for producing a foam molded body according to the second embodiment.
As shown in FIG. 9, in the suction step S <b> 7, the air in the split mold 14 is sucked from the air port 14 b provided in the split mold 14. Thereby, since the air pressure in the sealed space in the divided mold 14 is lowered, the single foam parison 20 swells toward the air port 14b. At this time, the slide core 14 a is pulled up to the surface of the split mold 14.
Thereby, the foaming molding without a recessed part can be manufactured. In addition, it is also possible to adjust the depth of the recessed part formed in a foaming molding by adjusting the drawing-in amount of the slide core 14a.
In this way, bubbles grow and the volume of the single-piece foamed parison 20 increases, and a foamed molded product is obtained.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

For example, in the method for manufacturing a foam molded body according to the first and second embodiments, a foam molded body is manufactured using a single foam parison, but a composite foam parison in which the foam parisons are in close contact with each other is used. Also good.
In this case, the method for producing a foamed molded product includes an extrusion process in which a mixed resin containing a foaming agent and a thermoplastic resin is extruded to form a foamed parison, and the foamed parison is brought into close contact with each other to form a composite foamed parison (sheet-like foamed parison); A mold clamping step for sandwiching and sealing the composite foam parison with the split mold, a support step for supporting the composite foam parison in the split mold, and a suction step for sucking air in the split mold and reducing the pressure. It will be.

The foamed parison extruded in the extrusion step may be cylindrical or a plurality of sheets.
In addition, there is no particular limitation on the method in which the foamed parisons are brought into close contact with each other to form a composite foamed parison. For example, as shown in FIG. 10, the foamed parisons may be brought into close contact with each other using a pressure roller 24 to form a composite foamed parison.
In the mold clamping step, it is preferable to blow air into the split mold from an air port provided in the split mold. In this case, the adhesion between the foamed parisons can be further improved.

  In the method for producing a foamed molded product according to the first and second embodiments, the extruded sheet-like foam parison is directly conveyed between the divided molds, and after molding, the sheet-like foam parison is cooled and solidified. Then, a foamed parison molded body may be formed, and then the foamed parison molded body may be reheated to return to a sheet-like foamed parison and conveyed between the divided molds to be molded.

  Moreover, in the manufacturing method of the foaming molding which concerns on 2nd Embodiment, the pressing board 14c may be provided in the front-end | tip of a slide core (refer FIG. 11). In this case, since the area which supports a sheet-like parison increases, it can suppress more reliably that a sheet-like parison is biased.

  The foam molded article obtained by the method for producing a foam molded article according to the present invention is suitably used as a foam core material, specifically, for automobiles, aircraft, vehicles / ships, building materials, and various electrical equipment. It is used for structural members that are resistant to bending rigidity or bending buckling for housing and sports / leisure. Such a foam-molded product is excellent in strength without warping.

DESCRIPTION OF SYMBOLS 13, 14 ... Split mold 13a ... Protrusion 13b, 14b ... Air port 14a ... Slide core 14c ... Holding plate 20 ... Single-piece foam parison (sheet-like foam parison)
24... Pressure roller 40... Foam molded body 42.
43 ... Accum chamber 41 ... T die 44 ... Roller S1 ... Extrusion process S2, S5 ... Clamping process S3, S6 ... Support process S4, S7 ... Suction process

Claims (6)

A method for producing a foam molded article for producing a foam molded article from a foam parison,
Extruding a mixed resin containing a foaming agent and a thermoplastic resin to form a sheet-like foamed parison;
A mold clamping step of sandwiching and sealing the sheet-like foamed parison with a pair of split molds;
A support step for supporting the sheet-like foamed parison in a split mold;
A suction step of sucking and depressurizing air in the split mold;
The manufacturing method of a foaming molding provided with.   The method for producing a foam-molded article according to claim 1, wherein the sheet-like foam parison comprises one sheet and has a thickness of 1 mm or more.   The manufacturing method of the foaming molding of Claim 1 with which the said clamping process and the said support process are performed simultaneously.   The manufacturing method of the foaming molding as described in any one of Claims 1-3 in which the processus | protrusion is provided in the said division mold, and this processus | protrusion supports the said sheet-like foaming parison in a division mold.   The foamed molded product according to any one of claims 1 to 3, wherein the split mold is provided with a slidable slide core, and the slide core supports the sheet-like foam parison in the split mold. Manufacturing method.   The manufacturing method of the foaming molding as described in any one of Claims 1-5 which blows air in the said division mold from the air port provided in the said division mold in the said mold clamping process.

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