JP4335706B2 - Prefabricated body-interior resin panel and prefabricated body-interior resin panel. - Google Patents

Description

  The present invention is a resin panel having a hollow double-wall structure having a front wall and a back wall, and a preformed body made of a thermoplastic resin preformed in a shape substantially the same as the space in the hollow part is internally provided in the hollow part. Further, the present invention relates to a pre-molded body-interior resin panel and a prefabricated body-interior resin panel.

  A blow method for forming a hollow molded product by vacuum-sucking a sheet-like parison onto the cavity surface of a mold and introducing a pressurized fluid into the parison after clamping the mold is disclosed in JP 2000-218684 A and JP 2000 2000 A. JP-A 2000-218682 discloses a blow method for forming a hollow molded product in which a foam formed in advance is disposed between a pair of sheet-like parisons. It has been introduced.

Further, a hollow double wall molded product in which a heat insulating material containing air in a hollow portion thereof is enclosed in a dense state is described in Japanese Patent Application Laid-Open No. 11-48320. JP, 2003-164315, A, in which a hollow portion is filled with a foam and an air vent hole is provided on the opening side end face of the storage recess so as not to increase the internal pressure due to buffer deformation of the storage recess. It is described in the publication.
JP 2000-218684 A JP 2000-218682 A Japanese Patent Laid-Open No. 11-48320 JP 2003-164315 A

  The hollow double-wall molded article described in the above-mentioned JP-A-2000-218684, JP-A-2000-218682, JP-A-11-48320, and JP-A-2003-164315 has a foam in its hollow part. Although it is sealed or filled in a dense state, it is a problem in that it is inferior in strength such as rigidity, heat insulation, etc., because the foam and the wall inner surface of the hollow double wall molded product are in contact with each other. In addition, there is a problem that if there is no opening, the inner wall of the front and back walls of the preform and the resin panel may be peeled off due to expansion deformation due to internal pressure after molding and after molding. was there.

  Therefore, the present invention has welded the preform formed in the hollow part to the inner wall surface of the front wall and the back wall of the resin panel, and provided at least one hole for communicating the hollow part inner space with the outside air. This eliminates air trapping between the inner wall of the resin panel and the inner wall of the resin panel and the preform during molding and completely integrates the preform to the inner wall of the resin panel. It is an object of the present invention to provide a preformed body-interior resin panel excellent in strength such as rigidity and heat insulation, and a prefabricated container composed of the preformed body-interior resin panel.

  In order to achieve the above object, a preformed body-interior resin panel according to claim 1 of the present invention is a resin panel having a hollow double wall structure having a front wall and a back wall, There is a welded part on the entire circumference, and inside the hollow part, a preformed body made of a thermoplastic resin preformed in substantially the same shape as the space inside the hollow part is internally provided, and the preformed body is connected to the front wall of the resin panel. It is welded to the inner wall surface of the back wall, and is characterized in that at least one aperture is formed to communicate the hollow space and the outside air.

  The preformed body-interior resin panel according to claim 2 of the present invention is the preformed body-interior resin panel according to claim 1, wherein at least one opening communicating the hollow space and the outside air is sealed after molding. It is characterized by that.

  A preformed body-incorporated resin panel according to claim 3 of the present invention is the preformed body-incorporated resin panel according to claim 1 or 2, wherein the preformed body is formed to be embedded in the space in the hollow portion without any gap. It is characterized by being a foam.

  A preformed body-incorporated resin panel according to claim 4 of the present invention is the preformed body-incorporated resin panel according to claim 1 or 2, wherein at least one opening communicating the hollow space and the outside air is an opening. Is formed in the vicinity of the welded portion.

  According to a fifth aspect of the present invention, there is provided a prefabricated container comprising the preformed body-interior resin panel according to the first to fourth aspects.

  Furthermore, the assembly-type container according to claim 6 of the present invention has a pair of opposite side walls that are connected to each side of the bottom wall so as to be able to rise and fall, and another pair of side walls that face each other. A box-shaped container having an open top surface, wherein the pair of side walls are folded so as to face the top surface of the bottom wall, and the other pair of side walls are folded and overlapped on the pair of side walls. The wall and all the side walls are constituted by the preformed body-interior resin panel according to claims 1 to 4.

  According to the present invention, the preform formed in the hollow portion is welded to the inner wall surfaces of the front and back walls of the resin panel, and at least one opening is provided to communicate the hollow portion inner space with the outside air. This eliminates air accumulation and expansion deformation between the inner wall of the front and back walls of the resin panel and the preform during molding, so that the preform is welded and integrated with the inner wall of the front and rear walls of the resin panel. Therefore, it is possible to obtain a pre-molded body-incorporated resin panel and a pre-molded-inner resin panel that are excellent in strength such as rigidity and heat insulation.

  FIG. 1 is a partially cutaway perspective view of a preformed body-interior resin panel according to an embodiment of the present invention.

  In FIG. 1, reference numeral 1 denotes a preformed body-incorporated resin panel, which is a hollow portion of a resin panel 4 having a hollow double wall structure having a front wall 2 and a back wall 3. A preformed body 6 made of a thermoplastic resin preformed in substantially the same shape as the inner space of the hollow portion 5 is housed in the interior 5, and the preformed body 6 is a foamed resin body. The resin panel 4 has a welded portion 7 over its entire circumference, and this welded portion 7 is formed on a parting line at the time of molding. The preformed body 6 housed in the hollow portion 5 is welded to the inner wall surface of the front wall 2 and the back wall 3 of the resin panel 4. In the resin panel 4, at least one opening (not shown because it is formed in the back wall) is formed in the vicinity of the welded portion 6 to communicate the space inside the hollow portion 5 and the outside air during molding. However, since the opening is sealed so as not to leave a trace by welding or the like after molding, the opening does not appear in FIG. The resin panel 4 and the preform 6 are made of a polyolefin resin such as polyethylene or polypropylene, and the resin panel 4 and the preform 6 are made of the same resin. Furthermore, the preform 6 is preferably a foam, but a molded body that is pre-molded with a thermoplastic resin in a shape substantially the same as the space in the hollow portion of the resin panel, such as a honeycomb-shaped molded body, can be applied. is there.

  FIG. 2 illustrates an assembly type container 8 constituted by the preformed body-interior resin panel 1. As shown in FIG. 2, the assembly type container 8 has four side walls attached to the bottom wall 9 by pivoting so that the side walls 10 can be tilted up and down, and the side walls 10 adjacent to each other are detachably connected by a latch 11. ing. Further, the assembly-type container 8 is folded so that the pair of side walls 10a, 10a are folded on the back wall 3 of the bottom wall 9 and the other pair of side walls 10b, 10b are folded on the pair of side walls 10a, 10a. Configured. The bottom wall and the back wall 3 of the side wall have an opening 23. However, the opening 23 is preferably sealed by welding or the like after molding.

  The assembly-type container according to the present invention is not limited to the above-described configuration, and the bottom wall and the side wall may be integrally connected to each other via a thin-walled hinge. In the case of a thin hinge, the bottom wall and the side wall can be folded outwardly without being overlapped and folded.

  FIG. 3 to FIG. 9 show the molding modes of the preform-molded resin panel shown in FIG. 1 in the order of steps, and each figure is a sectional view.

  Next, the blow molding aspect of the resin hollow molded article 1 as shown in FIG. 1 will be described. As shown in FIG. 3, the pair of sheet-like parisons 13 and 13 extruded from the resin extrusion head 12 are disposed between the divided molds 14 and 14. The split molds 14 and 14 have concave cavities 15 and 15 for vacuum forming, and 16 is a contact surface that forms the vacuum suction gap and communicates with the vacuum chamber 17. Reference numeral 18 denotes an inner frame, and the inner frame 18 can protrude from the body 20 having the heating surfaces 19 and 19 facing the cavities 15 and 15 of the divided molds 14 and 14 and the periphery of the cavities 15 and 15. Moving frames 21 and 21 are provided.

  As shown in FIG. 3, the split molds 14, 14 are opened and an intermediate frame 18 is disposed at an intermediate position thereof, and sheet-like parisons 13, 13 are disposed between the intermediate frame 18 and the cavities 15, 15, respectively. . Next, as shown in FIG. 4, the moving frames 21, 21 are moved in the direction of the divided molds 14, 14, and the sheet-like parisons 13, 13 are sandwiched between the cavities 15, 15, whereby the cavities 15, A closed space is formed between 15 and the sheet-like parisons 13 and 13. Next, as shown in FIG. 5, in this state, the closed space is vacuum-sucked from the contact surface 16 so as to be adsorbed to the sheet-like parisons 13 and 13 cavities 15 and 15, and as shown in FIG. 14 is closed and the pressurized fluid is introduced through the blowing means provided in the inner frame 18 to bring the sheet parisons 13 and 13 into close contact with the cavities 15 and 15. Next, as shown in FIG. 7, the split molds 14 and 14 are opened, the middle frame 18 is detached, and as shown in FIG. 8, the sheet-like parison 13 along one cavity 15 of the split molds 14 and 14. The preform 6 which is a foam is joined and arranged on the inner surface of the sheet, and in this state, as shown in FIG. 9, the split molds 14 and 14 are closed and an opening is formed in one sheet-like parison 13 The needle 22 is protruded from the surface of the cavity 14 to allow the space between the preform 6 to communicate with the outside air, and the preform 6 is completely welded and integrated with the inner surfaces of the pair of sheet parisons 12 and 12. A preformed body-interior resin panel 1 shown in FIG.

When the divided molds 14 and 14 are closed and the pressurized fluid is introduced through the blowing means provided in the inner frame 18, the inner surfaces of the sheet parisons 13 and 13 are heated by the heating surfaces 19 and 19 provided in the inner frame 18. Is kept in a molten state, and by placing the preformed body 6 which is a foam, the preformed body is welded to the inner wall surface of the front and back walls of the resin panel.

It is a perspective view which partially fractures | ruptures and shows the preforming body interior resin panel which concerns on one embodiment of this invention. It is a perspective view of the assembly-type container comprised with the preformed body interior resin panel which concerns on this invention. It is sectional drawing which shows the shaping | molding aspect of the preforming body interior resin panel which concerns on this invention, opens a division mold, arrange | positions an inner frame, and shows the process of having arrange | positioned a pair of sheet-like parison. FIG. 4 is a cross-sectional view showing a state in which the split mold is closed from the state of FIG. 3 until it comes into contact with the moving frame of the middle frame. It is sectional drawing which shows the state which carried out the vacuum suction of a pair of sheet-like parison from the state of FIG. FIG. 5 shows a state in which the split mold is further closed until it abuts against the middle frame while pushing down the moving frame, and a pressurized fluid is introduced through the blowing means of the middle frame to bring the sheet parison into close contact with the cavity. It is sectional drawing. It is sectional drawing which shows the state which opened the division | segmentation metal mold | die from the state of FIG. 6, and removed the inner frame. It is sectional drawing which shows the state which joined and arranged the preforming body on the inner surface of the sheet-like parison along one cavity from the state of FIG. FIG. 9 is a cross-sectional view showing a state in which the split mold is closed from the state shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Preliminary body interior resin panel 2 Front wall 3 Back wall 4 Resin panel 5 Hollow part 6 Preliminary body 7 Welding part 8 Assembling type container 9 Bottom wall 10 Side wall 10a, 10b A pair of side wall 10c, 10d The other pair Side wall 11 Latch 12 Resin extrusion head 13, 13 Sheet-shaped parison 14, 14 Split mold 15, 15 Cavity 16 Contact surface 17 Vacuum chamber 18 Middle frame 19, 19 Heating surface 20 Body 21 Moving frame 22 Stitching needle 23 Hole

Claims (6)

A resin panel with a hollow double wall structure having a front wall and a back wall,
The resin panel has a welded part all around it,
Inside the hollow portion is pre-molded body made of a thermoplastic resin preformed in substantially the same shape as the space inside the hollow portion,
The preform is welded to the inner wall of the front and back walls of the resin panel,
A preformed body-incorporated resin panel, wherein at least one aperture is formed to communicate the hollow space and the outside air.   2. The preformed body-incorporated resin panel according to claim 1, wherein at least one opening communicating the hollow space and the outside air is sealed after molding.   4. The preformed body-incorporated resin panel according to claim 1, 2 or 3, wherein the preform is a foam formed so as to be embedded in the space inside the hollow portion without any gap.   3. The preformed body-incorporated resin panel according to claim 1 or 2, wherein at least one opening communicating the hollow space and the outside air is formed on one of a front wall and a back wall of the resin panel. .   A prefabricated body-incorporated resin panel according to claim 1, wherein the prefabricated container is an assembly type container.   A box-shaped container having a pair of opposing side walls that are connected to each side of the bottom wall so as to be able to rise and fall, and a pair of opposing side walls, each side wall standing upright and having an upper surface open. 5. The spare wall according to claim 1, wherein the side wall is folded so as to be opposed to the upper surface of the bottom wall, and the other pair of side walls are folded on the pair of folded side walls. A prefabricated container characterized by being formed of a molded product interior resin panel.

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