JPH0257554A - Pallet - Google Patents

Abstract

PURPOSE:To obtain a pallet which is thinner and has a flexural rigidity stronger than a pallet, the whole of which is made of a synthetic resin by forming the pallet main body with a core material covered with a glass fiber reinforced thermoplastic resin, and at the same time, forming the leg part by extending a part of the resin of this pallet main body integrally. CONSTITUTION:This pallet 10 has a structure in which three leg parts 14 (14A, 14B, 14C) are integrally projected from a main body 12. For the main body 12, a core material 18 is burried in a synthetic resin 16. For this reason, the core material 18 is covered by the synthetic resin 16, and a part of this synthetic resin 16 is integrally connection-extended to the leg part 14. The synthetic resin 16 is a thermoplastic synthetic resin which is reinforced by the filling of a glass fiber. For the core material 18, a plywood or medium density fiber board, etc. is applicable. The leg parts 14A-14C, three of them are formed mutually in parallel and with an even space on the back surface of the main body 12, and they have a hollow shape with a deep groove 22 which is formed from the tip part. This deep groove 22 is divided into a plurality of pieces by ribs 24.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a pallet used for cargo handling operations.

[Background technology]

A pallet for loading heavy objects and transporting them by a forklift or the like is constructed by assembling wooden boards into a frame shape. This wooden pallet has an uneven surface and has problems with nails etc. protruding, so synthetic resin pallets are being used instead. These synthetic resin pallets are impact resistant, lightweight, and have a long lifespan, but due to the nature of the synthetic resin, their bending strength is lower than that of wooden pallets, and they have the disadvantage that they must be made thicker overall. There is.

In consideration of the above facts, the present invention aims to obtain a pallet made of synthetic resin that is thin and has high bending strength.

[Summary and operation of the invention]

The present invention is characterized in that a core material is covered with a glass fiber reinforced thermoplastic resin to form a pallet body, and the resin is integrally extended to form legs.

As described above, in the present invention, since the core material is embedded in the synthetic resin as the pallet body, this core material improves the bending strength of the pallet body, making it possible to carry a high load. In addition, the core material is covered with glass fiber reinforced thermoplastic resin, so
The surface of the pallet body is as smooth as if it were made entirely of synthetic resin, and has excellent weather resistance and chemical resistance. Furthermore, since the legs are also formed by integrally extending synthetic resin, the glass fiber-reinforced thermoplastic resin can reliably support the load.

[Embodiments of the invention]

FIG. 1.2 shows a pallet 10 according to this embodiment. This pallet 10 has a main body 12 having a rectangular planar shape.
Three leg portions 14 (14A, 14B, 14C) integrally protrude from the top.

The main body 12 has a core material 18 embedded inside a synthetic resin 16. For this reason, the core material 18 is covered with a synthetic resin 16, and a portion of this synthetic resin 16 is integrally connected and extended to the leg portions 14.

The synthetic resin 16 is a thermoplastic synthetic resin reinforced by glass fiber filling. Core material 18 is plywood, MDF
(medium density fiberboard) etc. can be applied.

As shown in FIG. 2, three leg parts 14A to 14C are formed on the back surface of the main body 12 in parallel with each other and at equal intervals, and have a hollow shape with a deep groove 22 formed from the tip. This deep groove 22 is divided into a plurality of parts by ribs 24.

FIG. 3 shows an upper mold 32 and a lower mold 34 for manufacturing this pallet 10. The upper mold 32 has a lower mold 34
When the main body 1 is in close contact with the protrusion 34A of the lower mold,
A recessed portion 32A for forming a portion 2 is provided. In addition, when the lower mold 34 is in close contact with the upper mold 32, the leg portion 14
A plurality of deep grooves for forming the projection 34A are provided in the protrusion 34A.

These deep grooves are deep grooves 34B and 34C for forming the leg parts 14A and 14C, and deep grooves 34D and 34E for forming the leg part 14B. The sides are closed by the upper mold 32 when the upper mold 32 and the lower mold 34 are fitted together. deep groove 3
4B and 34. C and the deep grooves 34D and 34E communicate with each other on the front side and the back side of the paper in FIG. 3, and form a cylindrical leg portion as shown in FIG. 2.

Next, a procedure for manufacturing the pallet 10 according to this embodiment will be explained.

As shown in FIG. 3, a plurality of (for example, three) resin sheets 36 are placed on the protrusion 34A of the lower mold. The resin sheet 36 may cover the entire surface of the lower mold protrusion 34A, but it is placed concentrated near the deep grooves 34B, C and 34D, E so that it can easily enter these grooves. be able to. As the resin sheet 36, a long glass fiber-reinforced thermoplastic resin sheet can be used, and for example, an X sheet (trade name, manufactured by Idemitsu Petrochemical Co., Ltd.) can be used. This resin sheet 36 is a polypropylene sheet in which long glass fibers are embedded, and after molding, the strength is greatly improved by the glass fibers.

A core material 18 having a slightly smaller area than the resin sheet 36 is placed on the resin sheet 36, and a thin resin sheet 38 made of the same material as the resin sheet 36 is further placed on top of the core material 18.

In this state, the upper mold 32 and the lower mold 34 are matched, and a pressure of about 100 kg/affl is applied between them. In this case, it is preferable to maintain the resin sheet 36, 38 at around 200°C, and the temperature of the upper mold 32 and lower mold 34 to be 60 to 80°C.
It is preferable to maintain the temperature at ℃.

As a result, the resin sheets 36 and 38 melt and adhere to each other, securely covering the periphery of the core material 18, embedding the core material 18, and forming the synthetic resin 16 shown in FIG. It goes in and becomes the leg part 14.

When plywood is used as the core material 18, the wall thickness before molding becomes thinner due to pressure after molding, and the wall thickness of the core material 18 becomes 1.
The thickness is approximately 5 mm, and the overall thickness of the main body 12 is approximately 20 mm, which is a value that can reliably maintain the specified strength specified in JIS ZO602. In other words, this pallet 10 is entirely M.
The bending strength is improved by about 1.3 to 1.5 times with the same wall thickness compared to when the DF is manufactured alone.

Furthermore, since the surface of this pallet 10 is covered with synthetic resin 1d, the surface is smoother than that of a wooden pallet, and even when printing paper and the like are stacked in multiple layers, they will not be damaged. Additionally, they are lighter in weight than wooden pallets, making them easier to handle.

In the embodiments described above, an anti-slip elastomer can be welded to the main body 12 during molding. In this case, an elastomer plate made of olefin or the like may be placed in the mold and welded to the front or back surface of the main body 12.

〔Effect of the invention〕

As explained above, in the pallet according to the present invention, the core material is covered with glass fiber reinforced thermoplastic resin to form the pallet body, and a part of the resin of this pallet body is integrally extended to form the legs. Therefore, it has an excellent effect of being thinner and having stronger bending strength than a pallet made entirely of synthetic resin.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing a pallet according to an embodiment of the present invention, Fig. 2 is a rear perspective view of this pallet, and Fig. 3 is a longitudinal sectional view showing the relationship with a mold during production. . 10 salary/pallet, 12...main body, 14.14A, 14B, 14c...legs, 16...
Synthetic resin, 18... Core material, 32... Upper mold, 34... Lower mold, 34B, 34C, 34D, 34E... Deep groove, 36. 38 ・・Resin sheet.

Claims (1)

[Claims] (1) A pallet characterized in that a core material is covered with a glass fiber-reinforced thermoplastic resin to form a pallet body, and the resin is integrally extended to form legs.