Foldable protection plastic sheet and manufacturing method thereof

Abstract

To provide a foldable protection plastic sheet that can be easily opened and closed in order to protect a track loading platform and a loaded object.SOLUTION: Provided is a foldable plastic sheet that can be arranged only on a loading platform bottom surface side including a connection sheet having flexibility for connecting plastic sheets, or a foldable protection plastic sheet that can be easily arranged not only on the loading platform bottom surface but also on a loading platform side surface side, and has excellent durability.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a foldable protective plastic sheet that can be easily opened and closed for the purpose of protecting a truck bed and the loaded goods.

Background Art

[0002] In addition, there is a method of coating a metal plate with a thermosetting resin (see Patent Document 1). However, since a metal plate is used, it is heavy, and when it comes into contact with the rotary part of a tractor or a combine, the resin surface layer may peel off or be damaged.

[0003] As another example, there is a method of assembling resin-made snowshoe-like parts (see Patent Document 2). In this case, it is necessary to mold a snowshoe-like plate, and it is considered difficult to provide it easily.

[0004] As other known examples, commercially available rubber mats, air cushion mats, plate materials, mats made of flannel or fabric are used. However, rubber deteriorates quickly, the mats are thin and easily torn. Plywood is likely to be deformed or cracked by rain. There are problems such as rubber and mats being cut when a blade hits them. Also, although it is possible to lay a plastic sheet such as a vinyl chloride sheet on the floor surface, there are problems such as the plate coming off or falling over on the side surface because it can only be leaned against the side surface.

[0005] In addition, as a conventional technique for folding a plastic sheet, there is a method of forming a fold by recessing a cut groove (see Patent Document 3). In this case, when used for a long time, there is a problem that it is easily damaged from the cut groove.

[0006]

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0008] The present invention has been made to solve the above problems, and an object thereof is to provide an excellent durability including a joint portion in which two protective plastic sheets are integrated by the joint sheet without damaging the truck bed or the loaded goods, and to provide the foldable protective plastic sheet for the purpose of protecting only the bottom surface of the truck bed and protecting the bottom surface and the side surface of the truck bed.

Means for Solving the Problems

[0009] The invention according to claim 1 is, as shown in FIG. 1, to provide a foldable plastic sheet for protecting a truck bed and loaded goods, which is assembled by heating the joint surface of the polyethylene sheet and the joint surface of the joint sheet with hot air and continuously pressing them with a pressure roller, where there is a polyethylene sheet with a smooth or patterned surface and a flexible joint sheet.

[0010] The invention according to claim 2 is to provide a foldable plastic sheet, characterized in that the polyethylene sheet according to claim 1 may be a mixture including low-density polyethylene, high-density polyethylene, linear low-density polyethylene, or a mixture thereof, and further including polypropylene.

[0011] The invention according to claim 3 is to provide a foldable plastic sheet, characterized in that one of olefin resins such as ethylene vinyl acetate, low-density polyethylene, linear low-density polyethylene, and polypropylene is suitable for the flexible joint sheet according to claim 1.

[0012] The invention according to claim 4 is a method for manufacturing a foldable plastic sheet as described in claim 1, comprising the steps of heating the plastic sheet manufactured in advance with a predetermined dimension and the bonding sheet, and bonding them with a pressure roller, and cutting the bonded plastic sheet, thereby providing a method for manufacturing a foldable plastic sheet.

Advantages of the Invention

[0013] According to the present invention, in order to achieve the above object, as shown in FIG. 1, the longitudinal directions of the two plastic sheets 1 manufactured to be equal to or smaller than the width and length of the truck bed are bonded by the bonding sheet 2. The bonding method is to heat the bonding surface with a heat source 3 such as hot air or a heater, and a foldable protective plastic sheet continuously integrated by a pressure roller 4 is completed. This foldable protective plastic sheet can not only protect only the bottom surface of the truck bed, but also easily protect the bottom surface and the side surface of the truck bed by standing it on the side surface as shown in FIG. 2.

[0014] Even when unloading, there is little friction between the loaded goods and the foldable protective plastic sheet, and it is expected that the goods can be moved with a small force. Furthermore, by providing unevenness on the surface and reducing the contact area, it is expected that the goods can be moved with an even smaller force.

[0015] In addition, since the product of the present invention is made of plastic, it has waterproof and chemical-resistant properties, has a compressive strength capable of loading heavy objects, becomes a flat truck bed just by laying it, has an effect of preventing damage to cultivators and cutting tools, and can provide a foldable protective plastic sheet with excellent durability.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0017] Next, preferred embodiments of the foldable protective plastic sheet according to the present invention will be given and described below with reference to the accompanying drawings.

Embodiment

[0018] Figure 1 shows a plastic sheet 1 made of low - density polyethylene, cut according to the truck bed, with a thickness of 6 mm, a width of 690 mm, and a length of 940 mm. The bonding sheet 2 was cut from ethylene - vinyl acetate resin with a thickness of 1 mm, a width of 50 mm, and a length of 940 mm. While heating the bonding portion in the longitudinal direction of the plastic sheet 1 and the bonding portion of the bonding sheet 2 with hot air at 480 °C, they were pressure - bonded at a speed of 1.6 m / min by a roller and continuously integrated.

[0019] Figure 2 shows a state where four foldable protective plastic sheets 1 are arranged when protecting the bottom surface and side surfaces of the truck bed. By simply opening the foldable protective plastic sheet upwards, it is possible to protect not only the bottom surface of the bed but also the side surfaces of the bed.

[0020] Figure 3 shows a state where two foldable protective plastic sheets are arranged when protecting only the bottom surface of the truck bed.

[0021] FIG. 4 shows a state in which two foldable protective plastic sheets 1 (thickness: 6 mm, width: 620 mm, length: 1350 mm) are arranged to protect the bottom surface of the truck bed and the side surface on the driving side of the bed. By simply opening the foldable protective plastic sheet upward, it is possible to protect not only the bottom surface of the bed but also the side surface on the driving side of the bed. When protecting, it shows a state in which two foldable protective plastic sheets are arranged.

[0022] FIG. 5 shows a state in which three foldable protective plastic sheets 1 (thickness: 6 mm, width: 470 mm, length: 1350 mm) are arranged to protect the bottom surface of the truck bed, the side surface on the driving side of the bed, and the side surface on the rear part side of the bed. By simply opening the foldable protective plastic sheet upward, it is possible to protect not only the bottom surface of the bed but also the side surface on the driving side of the bed. When protecting, it shows a state in which three foldable protective plastic sheets are arranged.

[0023] Schematic diagram showing the first cutting step of continuously cutting the central part of the plastic sheet 1. (See FIG. 6)

[0024] FIG. 7 is a schematic diagram showing the heat - pressure bonding step of continuously manufacturing the foldable protective plastic sheet 1 in which the plastic sheet 1 and the bonding sheet 2 are heat - pressure bonded and integrated.

[0025] FIG. 8 is a schematic diagram showing the second cutting step of continuously cutting the integrated foldable protective plastic sheet 1 into a predetermined length.

Industrial Applicability

[0026] In addition to the truck bed, for storing important items in warehouses, museums, etc.

Explanation of Reference Numerals

[0027] 1 --- Plastic sheet 2 --- Bonding sheet 3 --- Hot air 4 --- Pressure - bonding roller 5 --- Rubber roller 6 ――― Air cylinder 7 ――― Saw blade (for cutting) 8 ――― Hot air generator

Claims

1. A foldable protective plastic sheet used to protect truck beds and their cargo, The invention comprises a plurality of polyethylene-based plastic sheets arranged in parallel, and a bonding sheet made of an olefin-based resin that is more flexible than the polyethylene-based plastic sheets, which is positioned across the bonding surfaces of adjacent polyethylene-based plastic sheets. The joining surfaces of the polyethylene-based plastic sheets and the joining surfaces of the bonding sheets have a joint that is welded together by heating with hot air and continuous pressing with a pressure roller. A foldable protective plastic sheet characterized in that the connecting portion functions as a bending portion that connects the plurality of polyethylene-based plastic sheets to each other in a bendable manner, and the plastic sheet is formed so that it can be raised from a state where it is laid on the bottom surface of the cargo bed to the side of the cargo bed via the bending portion.

2. The foldable protective plastic sheet according to claim 1, characterized in that the plastic sheet is low-density polyethylene, high-density polyethylene, linear low-density polyethylene, or a mixture thereof, and further a mixture containing polypropylene.

3. The foldable protective plastic sheet according to claim 1, characterized in that the binding sheet is an olefin resin consisting of ethylene vinyl acetate, low-density polyethylene, linear low-density polyethylene, or polypropylene.

4. A process of welding together the plastic sheet and the bonding sheet, which are manufactured to predetermined dimensions, using a pressure roller at a speed of 0.5 to 3.0 m / min while heating them with hot air at 450 to 650°C, and then integrating them together. A method for manufacturing a foldable protective plastic sheet, characterized by comprising a step of cutting an integrated sheet to a predetermined length.

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