JPS636420B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin pallet reinforced with a reinforcing core.

In order to give rigidity to synthetic resin pallets, they are reinforced with reinforcing cores such as iron pipes or iron bars, but synthetic resin pallets that are reinforced with reinforcing cores have a tendency for the synthetic resin to shrink inside when molding shrinks. The molding shrinkage in the longitudinal direction of the reinforcing core around the reinforcing core is impeded, and the entire molding shrinkage becomes uneven, causing distortion in the synthetic resin pallet. There were flaws.

The present inventors have conducted research on a synthetic resin pallet that is reinforced with a reinforcing core but does not suffer from distortion due to uneven molding shrinkage in the longitudinal direction of the reinforcing core. As a result, we have arrived at the present invention.

The present invention provides a synthetic resin pallet reinforced with a reinforcing core, which consists of a lower pallet and an upper pallet, and the lower pallet has a deck board and a box-shaped body erected at both left and right ends of the deck board and in the center. In addition, the reinforcing core is buried in the deck board, and the end of the buried reinforcing core is exposed in the box, and the upper part of the pallet has a deck board and a box-shaped body erected at both left and right ends of the deck board and in the center. In addition, as the reinforcing core is buried in the deck board, the end of the buried reinforcing core is exposed inside the box, and the box at the bottom of the pallet and the box at the top of the pallet are thermally welded. The present invention relates to a synthetic resin pallet characterized in that the synthetic resin pallet is integrally formed with a reinforcing core and the end portion of the reinforcing core is held in a space sealed by a deck board and a box-shaped body.

According to the present invention, since the ends of the reinforcing core are exposed outside the resin, the synthetic resin does not hit the ends of the reinforcing core during molding shrinkage. The synthetic resin undergoes molding shrinkage in the longitudinal direction of the reinforcing core in the same way as other parts, making the entire molding shrinkage uniform and preventing distortion at the bottom and top of the pallet. Since the ends of the reinforcing core are confined in a sealed space after the pallet is manufactured, even though the ends of the reinforcing core are exposed outside the resin, it is possible to prevent rust from forming. can.

The present invention will be described below with reference to the drawings.

Fig. 1 is a partially cutaway perspective view showing an example of the pallet lower part 1 or the pallet upper part 2 having the same structure, and Fig. 2 is a synthetic resin made by thermally welding the pallet lower part 1 and the pallet upper part 2. FIG. 2 is a perspective view showing an example of a manufactured pallet.

The pallet lower part 1 and the pallet upper part 2 have a deck board 3 and a box-shaped body 4 at both left and right ends of the deck board 3 and in the center. The lower part of the pallet 1 and the upper part of the pallet have reinforcing cores 5 extending from side to side.
is buried, and both left and right ends of the reinforcing core 5 are exposed inside the enclosure 4.

The reinforcing core 5 that can be used in the present invention is made of metal such as iron, stainless steel, copper, or aluminum, or polyester reinforced with fibers such as glass fiber, carbon fiber, or metal fiber. Examples include pipes, rods, etc. made of thermosetting resins such as resins, epoxy resins, polyamide resins, and phenolic resins.

By applying a lubricant to the reinforcing core 5, an even better effect can be achieved in preventing distortion in the lower part 1 and the upper part 2 of the pallet during molding. Examples of the lubricant that can be used in the present invention include XS52-906 manufactured by Toshiba Silicon Co., Ltd.
Examples include silicone lubricants such as YF3808 and TSK5432M, amide lubricants represented by the structural formula C ₁₇ H ₃₅ CONH-CH ₂ -HNOCH ₃₅ C ₁₇ , and fluorine-based lubricants. To apply a lubricant to the reinforcing core 5, for example, the lubricant is diluted with an organic solvent such as toluene, xylene, methylene chloride, trichloroethane, or isopropyl alcohol to a concentration of 3 to 20% by weight, and the lubricant is applied by brushing, spraying, or the like. After coating by dip coating, etc., it may be cured at room temperature or by heating to form a film, or if the lubricant is in powder form, the lubricant may be uniformly sprinkled on a flat plate and then heated. After the reinforcing core 5 is rotated to adhere and melt the lubricant, it may be cooled at room temperature.

A reinforcing core 5 coated with a lubricant is placed in a mold, and a thermoplastic resin such as polyethylene or polypropylene is injected into the mold to form a lower pallet 1 and an upper pallet 2 reinforced by the reinforcing core 5. The lower part 1 of the pallet as well as the upper part 2 of the pallet may be non-foamed or foamed. When forming the pallet lower part 1 reinforced with reinforcing cores 5 as shown in FIG. 1, a plurality of reinforcing cores 5 may be arranged at right angles to the fork insertion holes 6, Accordingly, a plurality of reinforcing cores 5 may be arranged along the fork insertion hole 6.

In order to manufacture a synthetic resin pallet, a pallet lower part 1 reinforced with a reinforcing core 5 as shown in FIG.
and a pallet upper part 2 having the same structure as this,
Turn over the upper part 2 of the pallet, and attach the end of the box 4 of the lower part 1 of the pallet to the end of the box 4 of the upper part 2 of the pallet.
After heating and melting an iron plate heated to 180 to 240°C for 30 to 90 seconds, the end of the box 4 of the lower part 1 of the pallet and the end of the box 4 of the upper part 2 of the pallet are overlapped. Heat welding can be achieved by pressing at a pressure of 0.5 to 8 kg/cm ² for 30 to 120 seconds. Note that both ends of the reinforcing core 5 are exposed inside the box 4 in the lower part 1 and upper part 2 of the pallet. However, by overlapping the pallet lower part 1 and the pallet upper part 2 and heat welding them into one piece, both ends of the reinforcing core 5 are held in a space sealed by the deck board 3 and the box-shaped body 4, Because it can prevent contact with water,
Rust can also be prevented when the reinforcing core 5 is made of metal.

Example 1 XS52-906 manufactured by Toshiba Silicon Corporation was diluted with trichloroethane to a concentration of 8% by weight, and a length of
After immersing an iron pipe 5 having a diameter of 1040 mm and an outer diameter of 13.8 mm, it was dried for 2 minutes at 110° C. in a hot air drying oven.

By preparing five iron pipes 5 coated with a silicone lubricant as described above and arranging them in parallel in a mold so as to be perpendicular to the fork insertion hole 6, polyethylene was injected, as shown in Fig. 1. A pallet lower part 1 is formed by having a deck board 3 as shown, and a box body 4 at both left and right ends and the center of the deck board 3, in which an iron pipe 5 is buried and both ends of the iron pipe 5 are exposed inside the box body 4. As a result, despite the presence of the iron pipes 5, the molding shrinkage was uniform and no distortion occurred in the lower part of the pallet 1.

Prepare a pallet lower part 1 and a pallet upper part 2 having the same structure, turn the pallet upper part 2 over, and heat the ends of the box 4 of the pallet lower part 1 and the ends of the box 4 of the pallet upper part 2 to 190°C. After heating and melting the steel plates by contacting them for 60 seconds, the ends of the boxes 4 on the lower part 1 of the pallet and the ends of the boxes 4 on the upper part 2 of the pallet were immediately overlapped and heated at a pressure of 3 kg/cm ² . A synthetic resin pallet was obtained by pressing for 60 seconds and heat welding. In the obtained synthetic resin pallet, since both ends of the iron pipe 5 are held in a space sealed by the deck board 3 and the enclosure 4, it is possible to prevent the iron pipe 5 from rusting. did it.

Example 2 A powdered amide lubricant represented by the structural formula C ₁₇ H ₃₅ CONH―CH ₂ ―HNOC ₁₇ H ₃₅ was uniformly sprinkled on a flat plate, and then heated to 150°C. Length 1040 mm, outer diameter
A 13.8 mm iron pipe 5 was rotated to adhere and melt the amide lubricant, and then cooled at room temperature.

Iron pipe 5 coated with amide lubricant as described above
By preparing five pieces and arranging them parallel to each other in a mold so as to be perpendicular to the fork insertion hole 6, by injecting polyethylene, the deck board 3 and both left and right ends of the deck board 3 as shown in FIG. When the lower part of the pallet, which has a box body 4 in the center and has an iron pipe 5 buried therein and both ends of the iron pipe 5 are exposed inside the box body 4, the iron pipe 5
Despite the presence of molding, the molding shrinkage was uniform and no distortion occurred in the lower part 1 of the pallet.

Prepare a pallet lower part 1 and a pallet upper part 2 having the same structure, turn the pallet upper part 2 over, and place the end of the box 4 of the pallet lower part 1 and the end of the box 4 of the pallet upper part 2 at 190°C. After heating and melting the heated iron plate by contacting it for 60 seconds, immediately overlap the ends of the boxes 4 on the lower part 1 of the pallet with the ends of the boxes 4 on the upper part 2 of the pallet and apply a pressure of 3 kg/cm ^2. at 60
A synthetic resin pallet was obtained by pressing for a second and heat welding. In the obtained synthetic resin pallet, both ends of the iron pipe 5 are connected to the deck board 3 and the box body 4.
Since the iron pipe 5 is held in a sealed space, it is possible to prevent rust from forming on the iron pipe 5.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing an example of the lower part of the pallet or the upper part of the pallet according to the present invention, and Fig. 2 is an example of a synthetic resin pallet manufactured by thermally welding the lower part of the pallet and the upper part of the pallet. FIG. 1... Lower part of the palette, 2... Upper part of the palette, 3
... Deck board, 4... Concave body, 5... Reinforcement core.

Claims (1)

[Claims] 1. A synthetic resin pallet reinforced with a reinforcing core, consisting of a lower pallet and an upper pallet,
The lower part of the pallet has a deck board and a box-like body erected at both left and right ends and the center of the deck board, and a reinforcing core is buried in the deck board, and an end of the buried reinforcing core is exposed inside the box, The upper part of the pallet has a deck board and a box-like body erected at both left and right ends and the center of the deck board, and a reinforcing core is buried in the deck board, and an end of the buried reinforcing core is exposed inside the box, A synthetic resin pallet is integrally formed by heat welding the box at the bottom of the pallet and the box at the top of the pallet, and the ends of the reinforcing core are sealed by the deck board and the box. A synthetic resin pallet characterized by being held within a space.