JP2012066871A - Resin-made pallet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin-made pallet capable of being used for a long period of time without separation on a mutual welded surface or a parting line even in the case that curved deformation distortion is generated by a load of a freight added to a hollow double wall structure constituting the pallet.SOLUTION: The resin-made pallet 1 is obtained by blow-molding a thermoplastic resin. The hollow double wall structure 2 constituting the pallet has one wall or the upper surface wall 4 and the other wall or the lower surface wall 5, and both walls face each other with a clearance serving as a hollow part placed between them. The parting line 7 or the mutual welded surface of one half body and the other half body of the hollow double wall structure 2 is formed during blow molding. An outward protruding ridge 8 is formed along the parting line 7 to increase the welded surface area.

Description

  The present invention relates to a resin pallet having a hollow double wall structure obtained by blow molding a thermoplastic resin.

  As the resin pallet having a hollow double wall structure obtained by blow molding a thermoplastic resin, those described in Japanese Patent Application Laid-Open No. 2003-1790941 or Japanese Utility Model Laid-Open No. 6-3834 are known.

JP 2003-170941 A Japanese Utility Model Publication No. 6-3834

The resin pallet described in the above-mentioned Patent Document 1 is an integrated upper part and a lower part, and the side walls connecting the upper part and the lower part are joined to each other. An adhesive part (parting line) to which is welded is formed.
Further, the resin pallet described in Patent Document 2 is also obtained by welding and integrating two hollow molded bodies constituting the pallet so as to face each other. A line is formed.

Such a conventional pallet in which two hollow components and two hollow molded bodies are welded and integrated is basically a hollow body even if various reinforcing structures are applied. When a load is applied by the load, there is a drawback that deformation deformation occurs in a curved shape, which causes separation at the parting line which is a welding surface of each other and makes it unusable at an early stage.
That is, as shown in FIGS. 6 and 7, the pallet a has a configuration in which one half b and the other half c of the hollow double-wall structure are integrated together, so that the load d is placed on the pallet a. When the deformation distortion due to the load is generated, peeling is likely to occur in the parting line e which is a welding surface of each other due to the repetition.

  Accordingly, an object of the present invention is to form a weld surface between one half of the hollow double wall structure and the other half of the hollow double wall structure at the time of blow molding on the peripheral wall of the hollow double wall structure constituting the pallet. By forming ridges facing outward so as to enlarge each other's welding area along the parting line, the hollow double-wall structure constituting the pallet is deformed into a curved shape due to the load from the load Therefore, even if distortion occurs, there is provided a resin-made bullet that can be used for a long period of time without causing peeling at the parting line that is the welding surface of each other.

  The resin pallet of the present invention that achieves the above object is a resin pallet having a hollow double wall structure obtained by blow molding a thermoplastic resin, and the hollow double wall structure constituting the pallet has a hollow portion. And a peripheral wall that integrally connects the peripheral walls of the upper wall and the lower wall that are opposite to each other with a gap therebetween, and the peripheral wall at the time of blow molding A parting line serving as a welding surface of one half and the other half of the hollow double wall structure is formed, and the welding area is expanded outwardly along the parting line. It is characterized by forming a ridge toward the surface.

  In the resin pallet according to the present invention, the opening end of the fork insertion hole for inserting the fork of the forklift formed on the peripheral wall of the hollow double wall structure constituting the pallet is formed outward. It is preferable that the edge portion surrounded by the ridges facing the ridge is formed and reinforced, and a rib that integrally connects the upper surface wall and the lower surface wall is formed adjacent to the fork insertion hole.

  According to the present invention, even if a load due to a load is applied to the hollow double wall structure constituting the pallet and a deformation distortion occurs in a curved shape, peeling occurs in the parting line that is the mutual welding surface. In addition, even when the forklift pawl is in contact with a portion other than the fork insertion hole, breakage such as cracking can be prevented, and a resin bullet that can be used for a long period of time can be obtained.

1 is an overall perspective view showing an embodiment of a resin pallet according to the present invention. It is an AA expanded partial sectional view of FIG. It is BB expanded partial sectional drawing of FIG. FIG. 2 is an enlarged partial cross-sectional view taken along a line CC in FIG. 1. It is an expanded sectional view of the forklift insertion hole part of FIG. It is a fragmentary sectional view which shows a prior art example regarding the subject of this invention. It is a fragmentary sectional view explaining an effect | action same as the above.

1 to 5, reference numeral 1 denotes a resin pallet. This resin pallet 1 is composed of a hollow double wall structure 2 obtained by blow molding a thermoplastic resin. The hollow double-wall structure 2 constituting the pallet has a square shape in plan view, and the upper wall 4 as one wall and the lower wall 5 as the other wall facing each other with a space to become the hollow portion 3 and both of them. It has a peripheral wall 6 that connects the peripheral ends of the wall together. The peripheral wall 6 is formed with a parting line 7 serving as a welding surface of one half and the other half of the hollow double wall structure 2 at the time of blow molding. Ridges 8 directed outward are formed so as to enlarge the welding area of each other.
The peripheral wall 6 is formed with fork insertion holes 9 for inserting a fork of a forklift on each of its four surfaces. Since the parting line 7 of the peripheral wall 6 is formed in a portion clamped at the time of blow molding, a burr (not shown) is generated, so that the welding area along the parting line 7 is expanded outwardly. The protruding ridges 8 are formed by cutting away the burrs leaving a required protruding length.
The hollow double-wall structure 2 constituting the pallet is formed with a plurality of ribs 10 adjacent to the fork insertion hole 9 and integrally connecting the upper wall 4 and the lower wall 5. The ribs 10 are protruded from the upper surface wall 4 side and the lower surface wall 5 side in the direction of the hollow portion 3 and are welded and integrated with each other. It can also be set as the aspect integrated by welding. In addition to being formed adjacent to the fork insertion hole 9, a plurality of ribs 10 are also formed at the center of the hollow double wall structure 2 to improve overall reinforcement and rigidity.
Further, the open end of the fork insertion hole 9 is reinforced by forming an edge portion 11 surrounded by a convex strip with its periphery facing outward. The ridges that form the edging portion 11 are the same height as the ridges 8 formed along the parting line 7, but this need not be the case.

  In the illustrated embodiment, the average thickness of the hollow double-wall structure 2 constituting the pallet is 2 to 8 mm, the height of the hollow portion 3 is 90 to 200 mm, and the ridge formed along the parting line 7. 8 has a protrusion width of 1.0 to 7.0 mm, and the protrusion 8 has a thickness of 1.0 to 5.0 mm. The ridges 8 may have a shape in which the burrs are cut off while leaving a necessary protruding length, but in view of the appearance, it is preferable to make the shape slightly tapered or rounded in the protruding direction.

  The thermoplastic resin constituting the resin pallet 1 according to the present invention is a polyolefin resin such as polyethylene or polypropylene, polyamide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polystyrene resin, ABS resin, polycarbonate resin, modified polyphenylene. It is a thermoplastic resin having excellent rigidity, such as an oxide resin or a blend thereof.

  In the resin pallet 1 according to the present invention, the upper wall 4 and the other half of the hollow double-wall structure at the time of blow molding are provided on the peripheral wall 6 of the hollow double-wall structure 2 constituting the pallet. Since the protruding ridges 8 are formed so as to enlarge each other's welding area along the parting line 7 which is a mutual welding surface of the lower surface wall 5 which is a half of the pallet, a pallet is formed. Even if the hollow double wall structure 2 is deformed and deformed in a curved shape due to a load by a load, it does not cause peeling at the parting line 7 which is a welding surface of each other. Since the periphery of the opening end is reinforced by an edge portion 11 surrounded by a ridge facing outward, the fork is inserted while the resin pallet 1 loaded with a heavy object is lifted by a forklift. It is possible to secure the strength to withstand loads to concentrate on the upper side of the fork insertion holes 9.

DESCRIPTION OF SYMBOLS 1 Resin pallet 2 Hollow double wall structure 3 Hollow part 4 Upper surface wall 5 Lower surface wall 6 Peripheral wall 7 Parting line 8 Convex strip 9 Fork insertion hole 10 Rib 11 Edge part

Claims (3)

A resin pallet having a hollow double wall structure obtained by blow molding a thermoplastic resin,
The hollow double-wall structure constituting the pallet is composed of an upper wall as one wall and a lower wall as the other wall, which are opposed to each other with a space as a hollow part, and a peripheral wall integrally connecting the peripheral ends of both walls. Have
The peripheral wall is formed with a parting line that serves as a welding surface of one half and the other half of the hollow double-walled structure during blow molding, and is formed along the parting line. A resin pallet characterized by forming outward ridges so as to enlarge the welding area.   A fork insertion hole for inserting a fork of a forklift is formed in the peripheral wall of the hollow double-wall structure constituting the pallet, and the opening end of the fork insertion hole is convex with the periphery facing outward. The resin pallet according to claim 1, wherein an edge part surrounded by a strip is formed and reinforced.   3. The resin pallet according to claim 2, wherein the hollow double-wall structure constituting the pallet is formed with ribs that integrally connect the upper wall and the lower wall adjacent to the fork insertion hole.

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