JPH0713735U - Hollow synthetic resin pallet - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] It is an object of the present invention to provide a hollow synthetic resin pallet that is integrally provided with prismatic portions at both ends. [Structure] A hollow synthetic resin panel 10 in which plate-shaped portions facing each other are connected by ribs and a space is formed between the upper and lower plate-shaped portions and the ribs is used.
Is a hollow synthetic resin pallet in which both ends in the length direction of the ribs are bent at right angles four times each to form the prismatic portion 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hollow synthetic resin pallet, and more particularly to a hollow synthetic resin pallet that is constructed by processing hollow synthetic resin panels.

[0002]

[Prior art]

 A synthetic resin panel having a hollow interior is known. Such a hollow synthetic resin panel is formed by placing a core of a special shape in the mouth of the extruder, and connecting plate-shaped parts facing each other with ribs. This is a hollow synthetic resin panel having a space between the plate portion and the rib. Such a panel can be integrally molded with a synthetic resin and has a structure similar to that of a corrugated board, and is widely used in various boxes.

Such a hollow synthetic resin panel has water resistance. In addition, since it is stronger than corrugated board, it can be used repeatedly. It is also considered to assemble a pallet using such a synthetic resin panel. When assembling a pallet with such hollow synthetic resin panels, injection-molded prismatic reinforcing materials are joined to both ends in the extending direction of the ribs. The strength of the pallet was given to maintain the shape of the pallet.

[0004]

[Problems to be solved by the device]

 According to the pallet thus assembled by joining the prismatic reinforcements to both ends in the extending direction of the rib, an injection-molded prismatic reinforcement is required together with the hollow synthetic resin panel. This increases the number of parts. Further, it is necessary to bond the above-mentioned prismatic reinforcing material to the hollow synthetic resin panel by some means. However, when the synthetic resin panel is made of a polypropylene resin extruded product, the adhesion is poor and the reinforcing material may come off.

The present invention has been made in view of the above problems, and is made of a hollow synthetic resin that is assembled only by a synthetic resin panel without using a prismatic injection molded body that is a separate member. The purpose is to provide a pallet.

[0006]

[Means for Solving the Problems]

 The present invention comprises a hollow synthetic resin panel in which plate-shaped portions facing each other are connected by ribs, and a region surrounded by the plate-shaped portions and the ribs is a space, and both ends in the extending direction of the ribs. The present invention relates to a hollow synthetic resin pallet formed by bending a part four times at substantially right angles to form a prismatic part.

[0007]

[Action]

 A hollow synthetic resin panel having a predetermined size is prepared in which plate-shaped portions facing each other are connected by ribs, and an area surrounded by the plate-shaped portions and the ribs is a space. A hollow synthetic resin pellet is obtained by forming both ends of the panel in the extending direction of the ribs four times at substantially right angles to form prismatic columns.

[0008]

【Example】

 1 and 2 show a hollow synthetic resin panel for manufacturing a hollow synthetic resin pallet according to an embodiment of the present invention. This panel 10 has a structure in which upper and lower plate-shaped portions 11 and 12 are connected by ribs 13 arranged at predetermined intervals, as shown in an enlarged view in FIG. A region surrounded by 12 and the left and right ribs 13 forms a space 14.

Such a hollow synthetic resin panel 10 is manufactured by extrusion molding while melting a polyolefin resin such as polyethylene or propylene. A special die is arranged in the die part of the extrusion molding machine, and the upper and lower plate-like portions 11 and 12 are connected by the rib 13 by such a die so that a space 14 is formed between them. The hollow panel is extruded and solidified. Therefore, such a panel is lightweight, uses a small amount of material, is excellent in strength, and is particularly excellent in water resistance.

FIGS. 3 and 4 show a hollow synthetic resin pallet assembled by such a hollow synthetic resin panel 10. That is, a hollow synthetic resin panel 10 having a predetermined size as shown in FIG. 2 is prepared, and both ends of the rib 1 of the panel 10 in the extending direction of 3 are bent at right angles four times, respectively, to form a prismatic shape. The part 16 is formed.

By bending both ends of the panel 10 in the extending direction of the ribs 13 to form the prismatic parts 16, it is possible to impart a predetermined strength to this pallet. Further, since both ends of the panel 10 are simply bent, it is not necessary to use a prismatic reinforcing member which is a separate member made of an injection molded body. Further, there is no need for a bonding step for joining the prismatic reinforcing member which is a separate member to the synthetic resin panel. In addition, the bonded portion will not peel off later and the prismatic portion will not fall off.

FIG. 5 shows an apparatus for forming the prismatic portions 16 at both ends of such a pallet, in which a seal bar 20 having a size slightly larger than the width of the panel 10 is used. Both ends of the seal bar 20 are supported by a pair of press cylinders 21. The press cylinders 21 on both sides are supported by a bracket 22, and the bracket 22 is connected to a piston rod 24 of a moving cylinder 23.

The moving cylinders 23 are also preferably provided on both the left and right sides, and the pair of moving cylinders 23 preferably move the seal bar 20. Further, as shown in FIG. 5, the moving cylinder 23 is arranged such that its axis is inclined.

A hold wing 27 for receiving the hollow synthetic resin panel 10 is arranged when the prismatic portion 16 is formed by such a seal bar 20. The hold wing 27 is rotatably supported by a pin 28. The receiving plate 29 is arranged so as to face the tip of the seal bar 20, and the lower surface of the panel 10 which is heat-welded by the seal bar 20 is received by the receiving plate 29.

Next, a process of manufacturing the hollow synthetic resin pallet by forming the prismatic portions 16 at both ends of the hollow synthetic resin panel 10 by the apparatus having the above-described configuration will be described in order. As shown in FIGS. 5 and 6, the hollow synthetic resin panel 10 is received by the receiving plate 29 and the hold wings 27 in the extending direction of the ribs 13. At this time, the hold wing 27 is rotated around the pin 28 and maintains a horizontal posture.

In this state, by pushing the piston rod 24 of the moving cylinder 23, the seal bar 20 is moved obliquely downward. Then, after this, the seal bar 20 is lowered by the press cylinder 21 as shown in FIG. A heater 25 is built in the seal bar 20, and the heat of the heater 25 melts a predetermined position of the synthetic resin panel 10.

After this, the seal bar 20 is raised by the pressing cylinder 21, and the seal bar 20 is retracted obliquely upward by the moving cylinder 23. Then, the hold wing 27 is rotated 90 ° about the pin 28. As a result, the portion melted by the seal bar 20 is bent at a right angle and solidified.

Next, the hold wing 27 is returned to the horizontal state with the pin 28 as the center. Then, the hollow synthetic resin panel 10 is moved rightward by a predetermined dimension as shown in FIG. After this, the seal bar 20 is lowered again by the moving cylinder 23 and the pressing cylinder 21, and the portion of the synthetic resin panel 10 received by the receiving plate 29 is melted by the seal bar 20. The pressing cylinder 21 moves the seal bar 20 upward, and the moving cylinder 23 retracts the seal bar 20 to the upper left.

Thereafter, as shown in FIG. 9, the hold wing 27 is rotated counterclockwise by 90 ° about the pin 28 to perform the second bending.

After this, the hold wing 27 is leveled again around the pin 28 as shown in FIG. Then, the hollow synthetic resin panel 10 is moved to the right by a predetermined dimension. Then, the seal bar 20 is moved to the lower right by the moving cylinder 23. Further, the seal bar 20 is lowered by the pressing cylinder 21 to melt the portion of the hollow synthetic resin panel 10 which is received at the predetermined position by the receiving plate 29. Then, after this, the seal bar 20 is moved upward by the pressing cylinder 21, and is retracted to the upper left by the moving cylinder 23.

Thereafter, as shown in FIG. 11, the hold wing 27 is rotated 90 ° counterclockwise about the pin 28. This forms the third corner.

Thereafter, as shown in FIG. 12, the hold wing 27 is rotated clockwise about the pin 28 to be horizontal. Then, the synthetic resin panel 10 is fed rightward by a predetermined size. After this, the seal cylinder 20 is moved to the lower right by the moving cylinder 23. Next, the seal bar 20 is lowered by the pressing cylinder 21, and the predetermined position of the panel 10 received by the receiving plate 29 is thermally melted. Then, after this, the seal bar 20 is raised by the press cylinder 21 and retracted to the upper left by the moving cylinder 23.

Thereafter, as shown in FIG. 13, the hold wing 27 is rotated counterclockwise by 90 ° about the pin 28. By such an operation, the prismatic portion 16 is formed at the end of the hollow synthetic resin panel 10 as shown in FIG.

The prismatic portion 16 as described above imparts a predetermined strength to the hollow synthetic resin pallet. In addition, the hollow pallet made of synthetic resin is provided with a predetermined shape retention property.

As described above, the hollow synthetic resin pallet according to this embodiment is bent at both ends in the extending direction of the rib 13 of the synthetic resin panel 10 forming the pallet to form the prismatic portion 16. I am trying. Therefore, according to such a structure, there is no need to prepare a prismatic reinforcing member made of a separate member that has been injection molded in advance, and to attach such a reinforcing member to the hollow synthetic resin panel by a method such as bonding. One-piece synthetic resin panels make it possible to assemble pallets. Also, the prismatic portions 16 at both ends will not fall off later.

Since the prismatic portions 16 at both ends of the panel 10 are automatically formed by the device shown in FIG. 5, it is not necessary for a human to manually fold and manufacture them. In particular, the step of bending at a right angle is achieved by the rotational movement of the hold wing 27, and since the portion melted by the seal bar 20 is bent at a right angle by the hold wing 27, it is folded. The angle of the bent portion becomes an exact right angle, the dimensional variation becomes small, and the prismatic portion 16 having a stable shape can be obtained.

The device shown in FIG. 5 also includes a moving cylinder 23 for moving the seal bar 20 from diagonally upper left to diagonally lower right. Since the seal bar 20 is obliquely moved by such a cylinder 23, it is possible to bend the seal bar 20 without any trouble even when forming the fourth bent portion as shown in FIG. Become Noh. That is, according to the structure in which the seal bar 20 is lowered from above, the flap already bent at the time of the final bending interferes with the seal bar 20 and interferes with the panel 10, thereby facilitating the bending operation. Will be hindered. However, such inconvenience can be effectively and surely resolved by the device shown in FIG.

A pallet having a width of 1100 mm, a length of 1100 mm and a height of 120 mm was actually manufactured. A load of 500 kg was applied to such a pallet, and no buckling was observed even after 100 hours specified by JIS.

Next, a modification of the above embodiment will be described. As shown in FIG. 13, in the hollow synthetic resin pallet of the above embodiment, the tip flap 17 of the prismatic portion 16 is not joined to the lower surface of the panel 10. Therefore, the prismatic portion 16 may fluctuate. Therefore, as shown in FIG. 14, the receiving plate 32 is inserted below the tip flap 17 of the prismatic portion 16 so that the welding head 33 performs spot heat welding. According to such a configuration, the tip flap 17 of the prismatic portion 16 is more strongly welded to the lower surface of the panel 10, and the strength is further improved, and in particular, the prismatic portion 16 is not deformed. To be prevented.

[0030]

[Effect of device]

 As described above, according to the present invention, a hollow synthetic resin pallet is formed from a hollow synthetic resin panel in which plate-shaped portions facing each other are connected by ribs, and a region surrounded by the plate-shaped portions and the ribs is a space. In this structure, both ends of the rib in the extending direction are bent four times at substantially right angles to form a prismatic portion.

Therefore, according to such a configuration, the pallet can be assembled only by the hollow synthetic resin panel, and it is not necessary to attach the prismatic portion made of another member to both ends by a method such as bonding. Therefore, the number of parts is reduced, the manufacturing is facilitated, and the defect that the prism is later dropped off is eliminated. Further, since the assembly is performed by simply bending the end portion of one synthetic resin panel, it becomes possible to provide the hollow synthetic resin pallet at low cost.

[Brief description of drawings]

FIG. 1 is an enlarged front view of a main part of a hollow synthetic resin panel.

FIG. 2 is a perspective view in which a hollow synthetic resin panel is partially broken.

FIG. 3 is a perspective view of an assembled pallet.

FIG. 4 is a front view of the assembled pallet.

FIG. 5 is a front view of a folding device for assembling a pallet.

FIG. 6 is a main part front view showing an operation of forming a prismatic portion.

FIG. 7 is a main part front view showing an operation of forming a prismatic portion.

FIG. 8 is a front view of relevant parts showing an operation of forming a prismatic portion.

FIG. 9 is a front view of relevant parts showing an operation of forming a prismatic portion.

FIG. 10 is a front view of relevant parts showing an operation of forming a prismatic portion.

FIG. 11 is a main part front view showing an operation of forming a prismatic portion.

FIG. 12 is a main part front view showing an operation of forming a prismatic portion.

FIG. 13 is a main part front view showing an operation of forming a prismatic portion.

FIG. 14 is a perspective view of relevant parts showing the assembly of a hollow synthetic resin pallet of a modified example.

[Explanation of symbols]

 10 Hollow Synthetic Resin Panels 11 and 12 Plate-shaped Part 13 Rib 14 Space 16 Square Column 17 Flap 20 Seal Bar 21 Press Cylinder 22 Bracket 23 Moving Cylinder 24 Piston Rod 25 Heater 27 Hold Wing 28 Pin 29 Receiving Plate 32 receiving plate 33 welding head

Claims (1)

[Scope of utility model registration request] 1. A hollow synthetic resin panel which is formed by connecting plate-shaped portions facing each other with ribs, and has a space in an area surrounded by the plate-shaped portions and the ribs. Hollow synthetic resin pallet that is formed by bending both ends approximately 4 times at right angles to form prismatic parts.