JPH063834U - Synthetic resin pallet - Google Patents

Abstract

(57) [Summary] [Purpose] To provide synthetic resin pallets with excellent compressive strength and bending strength. [Structure] Hollow molded body 1 forming synthetic resin pallet 11
Ribs 16 that integrally connect the outer surface plate 14 and the inner surface plate 15 are provided at an equal interval inside the inner surface 2.
5 is provided with a convex portion 17 ... In which a concave portion 18 is formed in the center, and a rib 16 is extended in the convex portion 17 and the concave portion 18 formed in the center of the convex portion 17. The extension portion 16a is formed, and the convex portion 17 is also integrally formed over the outer surface plate and the inner surface plate. [Effect] The compressive strength, bending strength and the like are improved as compared with the conventional pallet in which the convex portion has no rib extension portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is one in which a plate-shaped body integrally formed by hollow molding has two synthetic resin plate-shaped bodies having a plurality of convex portions on one surface, and the convex portions are heat-welded to each other. A double-sided use type pallet having

[0002]

[Prior art]

 Synthetic resin pallets manufactured by the blow molding method (hereinafter abbreviated as pallets) have been used because they are lightweight, have high bending strength, have flat upper and lower surfaces, and are hygienic. . This pallet is formed by sandwiching molten polyethylene parison in a mold and then blowing compressed air into the parison.

Conventionally, a pallet manufactured by blow molding has a structure as shown in FIGS. 5 and 6, for example. This pallet 1 is composed of two hollow molded bodies 2, 2. The hollow molded body 2 is internally provided with a required number of reinforcing plates (hereinafter abbreviated as ribs) 5 for integrally connecting the outer surface plate 3 and the inner surface plate 4, and the inner surface plate 4 has an upper surface. It has a structure in which nine convex portions 6 ... Which are flat surfaces are provided so as to project at the four corner portions, the central portion of each side, and the central portion of the inner face plate. That is, in the pallet 1, the convex portions 6 of the hollow molded bodies 2, 2 are made to face each other, and their flat surfaces are connected and integrated by heat welding.

In the pallet 1, the molten parison is extruded between a pair of split molds, the split mold is closed to press the rib 5 forming portion of the parison, and then the parison in the split mold is pressed. It can be manufactured by a method of blowing air by blowing air.

[0005]

However, each welded portion, that is, the convex portion 6 of the two hollow molded bodies 2, 2 forming the conventional pallet 1 has a shape expanded by the hollow molding. Since the reinforcing members such as the ribs 5 provided in other parts are not formed, the strength (especially compressive strength and bending strength) may be insufficient depending on the application.

Further, even if an attempt is made to form a reinforcing member such as a reinforcing rib on the convex portion 6 using the conventional reinforcing plate forming technique described above, there is a problem that the rib disappears during air blowing. , Could not be formed.

The present invention has been made in view of the above circumstances, and provides a pallet made of synthetic resin having excellent compressive strength and bending strength.

[0008]

[Means for Solving the Problems]

 The above-mentioned problem is to provide two blow moldings in which a reinforcing plate integrally formed over the outer surface plate and the inner surface plate is provided at a required position inside the hollow body made of synthetic resin, and the inner surface plate has a convex portion. In a pallet in which convex portions of a hollow body are connected and fixed by heat welding, a concave portion is provided at the center of the convex portion, and a reinforcing plate is integrally extended to the concave portion to solve the problem. .

[0009]

[Action]

 In the synthetic resin pallet of the present invention, a reinforcing plate integrally formed over the outer surface plate and the inner surface plate is provided inside the hollow body made of synthetic resin at a required position, and the inner surface plate is provided with a convex portion. In the pallet in which the convex portions of the two blow-molded hollow bodies that are connected to each other are fixed by heat welding, a concave portion is provided at the center of the convex portion, and a reinforcing plate is integrally extended to the concave portion. Compressive strength, bending strength, etc. are imparted to the pallet convex portion forming portion.

[0010]

【Example】

 Hereinafter, the present invention will be described in detail with reference to examples. 1 to 3 show one embodiment of the pallet of the present invention. FIG. 1 is a plan view of a pallet, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. It is a BB line sectional view. This pallet 11 is composed of two hollow molded bodies 12, 12.

As shown in FIG. 1, the hollow molded body 12 is internally provided with ribs 16 ... Which integrally connect the outer surface plate 14 and the inner surface plate 15 to each other. Nine convex portions 17 ... Are projectingly provided on the inner surface plate 15 at four corners of the hollow molded body 12, central portions of respective sides, and central portion of the inner surface plate. Further, a concave portion 18 is formed at the center of the convex portion 17, and the upper surface of the convex portion 17 other than the concave portion 18 forming portion is a flat surface.

As shown in FIG. 2, in the pallet 11 of this embodiment, the flat surfaces of the convex portions 17 of the two hollow molded bodies 12 and 12 described above are made to face each other, and the flat surfaces are abutted and welded to each other. However, they are connected and integrated.

Further, as shown in FIGS. 2 and 3, a rib extension portion 16a formed by extending the rib 16 is formed in the convex portion 17 and the concave portion 18 formed in the center of the convex portion 17, Moreover, the convex portion 17 is also integrally molded over the outer surface plate and the inner surface plate.

In the pallet 11 of the present embodiment, by providing the concave portion 18 at the center of the convex portion 17, it is possible to form the rib extension portion 16 a integrated with the rib 16 also in the convex portion 17. Therefore, the pallet 11 of this embodiment is improved in compressive strength, bending strength and the like as compared with the conventional pallet in which the ribs 16 are not provided on the convex portion 17.

Next, a method of manufacturing the pallet 11 of the above embodiment will be described. FIG. 4 is a diagram showing the flow of the manufacturing process of the pallet of this example. The blow mold 21 is composed of split molds 21a and 21b, and 21b for molding the inner surface plate 15 is provided with a tapered insert 25 at the center of a mold concave portion 23 for forming the convex portion 17. ing. Sliding pins 25 ... Are pierced through the recess 23 so as to be able to move in and out of the mold 21b except for the end portion.

The width (I) of the recess 23 is preferably 1.5 times or less the height (H) of the insert 24. This is because if the width (I) exceeds 1.5 times the height (H), it becomes difficult to form the rib extension portion 16a between the inner surface plate and the outer surface plate.

Further, a sliding plate 26 for forming the ribs 16 which is previously arranged at a desired interval is provided through 21a for molding the outer surface plate 14 so as to freely move in and out.

In the pallet manufacturing method of this example, first, as shown in FIG. 4 (a), a molten parison 27 is placed in the center of the split mold halves 21 a, 21 b opened by an extruder (not shown). After pushing out, the split mold is closed and the parison 27 is pinched off. Next, as shown in FIG. 4B, the sliding plate 26 penetrating the split mold 21a is projected into the mold 21, and the parison 27 is partially pressed to be pressure bonded. Further, at this time, the sliding pin 25 is projected into the mold 21 from the mold recess 23 of the split mold 21b, and the opposing parison 27 is securely pressure-bonded.

Next, after the sliding plate 26 of the mold 21a and the sliding pin 25 of the mold 21b are housed, the parison 27 is blown with air. At this time, as shown in FIG. 4 (c), the parison 27 expands to the full capacity, whereby the welded part expands and is stretched into a plate shape, and the ribs 16 ... Are formed. Each extension 16a of the ribs 16 is integrally formed over the inner surface plate and the outer surface plate. The sliding pin 25 is not necessarily required, but is a preferable means for extending the rib 16 more reliably.

Next, the convex portions 17 formed on the two produced hollow molded bodies 12, 12 are made to face each other, their flat surfaces are butted and welded, and they are connected and integrated to form the pallet shown in FIG. 11 is produced.

“Experimental Example” Å (Example) A pallet 11 was prototyped and the compressive strength and bending strength were measured. The pallet body of the prototype pallet was made of high-density polyethylene, and the entire external shape was width x length x thickness = 1300 mm x 1100 mm x 130 mm. (Comparative Example) As a comparative example, the compression strength and bending strength of the conventional pallet 1 having an overall outer shape of width x length x thickness = 1300 mm x 1 100 mm x 130 mm were measured.

The compressive strength and bending strength tests were carried out according to the methods defined in JIS Z 0602. The results are shown in Table 1.

[0023]

[Table 1]

[0024]

[Effect of device]

 As described above, in the synthetic resin pallet of the present invention, since the concave portion is provided at the center of the convex portion and the reinforcing plate is integrally extended to the concave portion inside, the synthetic resin pallet is formed. The compressive strength and bending strength of the pallet will be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

4A and 4B are views for explaining a method of manufacturing a synthetic resin pallet according to the present invention, in which FIG. 4A shows a mold clamping process, FIG. 4B shows a sliding plate and a sliding pin projecting, and FIG. It is a figure which shows time.

FIG. 5 is a plan view showing a conventional synthetic resin pallet.

6 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 11 ... Synthetic resin pallet 12 ... Hollow molded body 14 ... Outer surface plate 15 ... Inner surface plate 16 ... Reinforcement plate (rib) 16a ... Reinforcement plate (rib) extension 17 ... Convex part 18 ... Recessed part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Eto 3-2 Chidori-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Showa Denko K.K.

Claims (1)

[Scope of utility model registration request] 1. Two blow-molded hollows each having a reinforcing plate integrally formed over an outer surface plate and an inner surface plate at a required position inside a hollow body made of a synthetic resin, and having a convex portion on the inner surface plate. In a pallet in which convex portions of a body are connected and fixed by heat welding, a concave portion is provided at the center of the convex portion, and a reinforcing plate is integrally extended to the concave portion, and is made of a synthetic resin pallet. .