JP3152809U - Sheet pallet - Google Patents

Abstract

[PROBLEMS] To provide a temporary use that has the same performance as a sheet pallet formed from a synthetic resin that can be used repeatedly for the realization of a recycling-oriented society, and that does not require collection from overseas or return to overseas. A lightweight, environmentally friendly sheet pallet that can be used and has little impact on deforestation. A sheet pallet (1) includes a base layer (2) containing vulcanized fibers. The sheet pallet 1 may include an anti-slip layer 4 having a larger coefficient of static friction than the base material layer 2 on the stacking surface. [Selection] Figure 2

Description

  The present invention relates to a sheet pallet, and more particularly to a configuration of a base material layer of the sheet pallet.

  Conventionally, a wooden or plastic structure pallet has been often used as a pallet for loading a load during transportation. However, with the recent expansion of physical distribution, a sheet pallet disclosed in Patent Document 1 has been used in order to improve the efficiency of physical distribution by improving the loading efficiency and the transportation efficiency. The sheet pallet includes a sheet portion on which a load is loaded and a tab portion that extends integrally from the side of the sheet portion. A forklift equipped with a push-pull attachment is used to handle the load loaded on the sheet pallet with a forklift, and when loading the load onto the platen of the forklift, the tab portion is held by the push-pull attachment, and the push-pull attachment is used. This is done by moving the attachment back and forth on the platen.

  Since the sheet pallet itself is lightweight, an empty sheet pallet can be easily carried and handled by one worker, contributing to the efficiency of work in the factory. Furthermore, unlike a structural pallet, it is a sheet-like thin pallet, so the loading efficiency is high, and the energy efficiency for efficient use of warehouse space and logistics is high. The types of sheet pallets are mainly classified into synthetic resin products such as polyolefin resin for the purpose of repeated use, and paper and synthetic resin film products for the purpose of temporary use. In recent years, in particular, there has been an increase in the import and export of products using sheet pallets with good transport efficiency, and there has been a demand for paper and synthetic resin film-based sheet pallets intended for temporary use that do not require collection from overseas or return to overseas. It tends to increase.

JP 2000-289995 A

  By the way, a paper sheet pallet intended for temporary use has a significantly reduced tensile strength in a high humidity environment, and the tab portion gripped by the push-pull attachment at the time of unloading is cut and the original purpose cannot be achieved. Reinforcing measures such as compounding were necessary. However, there are various problems such as difficulty in processing such as complications and complex processing with highly safe adhesives, and concerns about damage to the load (cosmetic damage) due to increased thickness. Has occurred. On the other hand, from the viewpoint of protecting the global environment and waste disposal of plastics derived from petroleum resources, efforts to reduce waste through repeated use and realize a recycling-oriented society are becoming increasingly active. Yes. Plastic sheet pallets contribute to the realization of a recycling-oriented society because they are durable and can be used repeatedly, unlike paper and rigid resin film-based sheet pallets that are temporarily used. Even if there are various requirements for the sheet pallet in this way, it is difficult to be accepted in the market unless it has the same performance (tensile strength, elongation, etc.) as the conventional one.

  The present invention has the same performance as a sheet pallet formed from a synthetic resin that can be used repeatedly for the realization of a recycling-oriented society, and does not require temporary collection or return to overseas. The objective is to provide a lightweight, environmentally friendly sheet pallet that can be used and has little impact on deforestation.

According to one embodiment of the present invention, the sheet pallet is provided with a base material layer containing vulcanized fibers. Vulcanized fiber is a sheet material produced by treating raw materials made from natural materials such as cotton pulp and wood pulp with a zinc chloride solution and partially gluing it, followed by washing and drying. Vulcanized fibers are generally excellent in strength, and the elongation is within a range suitable for use as a sheet pallet. Therefore, the vulcanized fiber can be suitably used as a material for the sheet pallet. In addition, vulcanized fibers are manufactured by chemical treatment of natural materials, so CO ₂ emissions during production are small, and the final disposal is easy because the natural materials are used as the base layer.

  In this way, according to the present invention, it has the same performance as a sheet pallet formed from a synthetic resin that can be used repeatedly for the realization of a recycling-oriented society, and can be recovered from overseas or returned to overseas. It is possible to provide a lightweight and environmentally friendly sheet pallet that can be used temporarily and has little impact on deforestation.

  Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a sheet pallet according to an embodiment of the present invention. As shown in FIG. 1, the sheet pallet 1 preferably has a square plate-like sheet portion 1a and a tab portion 1b that extends integrally from one side of the sheet portion 1a. The sheet part 1a is a part on which a load is loaded. The tab portion 1b is a portion that is gripped by a push-pull attachment attached to the forklift when the sheet pallet 1 loaded with a load is handled by the forklift. In FIG. 1, the tab portion 1b extends from only one side of the sheet portion 1a. However, the tab portion 1b is formed from a plurality of sides such as two opposite sides, two adjacent sides, or three sides of the sheet portion 1a. It can also be extended.

  When handling the sheet pallet 1 loaded with a load, first, the tab portion 1b is gripped by the push-pull attachment attached to the forklift, and in this state, the push-pull attachment is pulled toward the base side of the platen of the forklift. As a result, the tab portion 1b is pulled, and the sheet pallet 1 moves while sliding on the platen. Then, the forklift is moved to a desired location while the sheet pallet 1 loaded with the load is placed on the platen, and the push-pull attachment is pushed back. As a result, the sheet pallet 1 is lowered from the platen.

  Due to such a method of use, a very large tensile force is applied to the sheet pallet 1 at the time of loading work. Moreover, this tensile force is repeatedly applied every time the sheet pallet 1 is used. In addition, the frictional force (coefficient of friction) between the loaded surface and the loaded surface should be as large as possible so that the loaded item does not move inadvertently or cause load collapse. desirable. Furthermore, it is desirable that the sheet pallet has an appropriate elongation in the direction in which the tensile force is applied. Specifically, the elongation of the sheet pallet is preferably 10 to 40%, more preferably 15 to 30%. If the elongation is less than 10%, the sheet pallet is easily broken when a sudden tensile load is applied, and if it exceeds 40%, the sheet pallet is easily stretched and difficult to use. In order to satisfy these requirements, the sheet pallet 1 of the present embodiment employs the structure described below.

  FIG. 2 is a schematic cross-sectional view of the sheet pallet shown in FIG. The sheet portion 1a of the sheet pallet 1 is formed by laminating the base material layer 2, the adhesive layer 3, and the anti-slip layer 4 in this order from the back surface S2 side. The tab portion 1b shown in FIG. 1 also has the same laminated structure as the sheet portion 1a.

  The base material layer 2 is formed of vulcanized fiber. As mentioned above, vulcanized fiber is a sheet produced by treating raw materials made from natural materials such as cotton pulp and wood pulp with a zinc chloride solution, and partially pulverizing it, followed by washing, drying, etc. It is a material.

  The adhesive layer 3 is an adhesive layer that joins the anti-slip layer 4 and the base material layer 2 together. The material of the adhesive layer 3 can be appropriately determined according to the materials of the base material layer 2 and the anti-slip layer 4.

  The anti-slip layer 4 constitutes a loading surface S1 on which a load on the sheet pallet 1 is loaded. The anti-slip layer 4 is composed of linear low density polyethylene, low density polyethylene, ethylene / vinyl acetate copolymer (EVA), ethylene / ethyl acrylate copolymer (EEA), ethylene / methyl methacrylate copolymer (EMMA). Selected from the group consisting of ethylene / acrylic acid copolymer (EAA), ethylene / methacrylic acid copolymer (EMAA), ionomer resin, or a mixture thereof. The thickness of the anti-slip layer 4 is desirably 10 μm to 40 μm.

  By providing the anti-slip layer 4 on the loading surface S1 side, an appropriate static friction coefficient can be obtained. In order to prevent the load from moving or collapsing during transportation, it is desirable that the anti-slip layer 4 has a larger coefficient of static friction than the base material layer 2. Specifically, the static friction coefficient is preferably 0.4 or more, and more preferably 0.5 or more. For example, when a C6A flute cardboard is used, the seat pallet 1 of the present embodiment can obtain a friction coefficient of 0.5 or more.

  The sheet thickness of the sheet pallet 1 is preferably 0.25 to 0.4 mm. If it is less than 0.25 mm, sufficient rigidity of the sheet pallet cannot be secured, so that it is difficult to grip with a forklift gripper, and workability is poor. If the thickness exceeds 0.4 mm, the rigidity becomes too high, and it becomes difficult to simultaneously wind up the dub part or surplus part of the sheet pallet when carrying the load collapse prevention with the stretch film after the load is loaded on the sheet pallet. Further, if the thickness is too large, not only is the cost increased and this is not economically preferable, but also the sheet pallet becomes heavy and handling properties deteriorate.

  The base material layer 2 may be composed of only vulcanized fibers as described above, but a layer made of a conventional thermoplastic resin may be appropriately provided. Further, in order to enable smooth movement of the load, a layer having a small friction coefficient may be additionally provided on the back surface of the base material layer 2 (the side to be the back surface S2 of the sheet pallet 1). Such a layer can be formed from a biaxially oriented polypropylene (OPP) film, a biaxially oriented polyethylene terephthalate (PET) film, or the like. These materials can obtain a coefficient of friction as small as about 0.3, and are suitable as a layer constituting the back surface S2. If necessary, a layer having a small friction coefficient such as kraft paper may be additionally provided.

  With reference to FIG. 3, the manufacturing method of the base material layer 2 using a vulcanized fiber is demonstrated. First, the base papers 2a to 2c manufactured from wood fibers, cotton fibers, etc. are fed out from the base paper rolls 5a to 5c, aligned with the rollers 6a to 6c, and sent to the zinc chloride solution layer 7 having a liquid temperature of 40 to 50 ° C. . The base papers 2a to 2c are immersed in a zinc chloride solution while being in close contact with each other, and the fibers are expanded and dissolved. The base papers 2a to 2c after the immersion are once taken out from the zinc chloride solution layer 7 and changed in direction by a roller 8 and sent to the water washing layer 9. The base papers 2a to 2c are washed with a water washing layer 9 to remove zinc chloride. Thereafter, the base papers 2a to 2c are taken out from the water washing layer 9, changed in direction by the roller 10, and sent to the drying rollers 11a and 11b. The base papers 2a to 2c are dried by the drying rollers 11a and 11b and then pressed by the calendar rollers 12a and 12b, so that the gloss and smoothness are enhanced. The base material layer 2 of the sheet pallet is manufactured through the above steps.

  The sheet pallet 1 can be created by appropriately selecting a laminating method generally used for laminating sheet materials, such as an extrusion lamination method or a thermocompression bonding method. In FIG. 4, an example of the manufacturing method of the sheet pallet 1 by the extrusion lamination method is shown. The base material layer 2 and the anti-slip layer 4 are wound in a roll shape. First, the base material layer 2 and the anti-slip layer 4 are supplied between the pressure roller pair 13 from different directions. An extruder 14 is installed above the joining portion of the base material layer 2 and the anti-slip layer 4, and a heat for joining the base material layer 2 and the anti-slip layer 4 from the T die 14 a. A binder (adhesive layer 3) made of a plastic resin is supplied between the base material layer 2 and the anti-slip layer 4. The supplied binder is sandwiched between the base material layer 2 and the anti-slip layer 4 between the pressure roller pair 13, and part of the binder soaks into the base material layer 2, thereby the base material layer 2 and the anti-slip layer. 4 are stacked. As described above, a laminated body as a material of the sheet pallet 1 is obtained. By processing the obtained laminate into a desired shape, a sheet pallet 1 as shown in FIG. 1 is obtained.

  Thus, since vulcanized fiber is manufactured according to a general papermaking method, the fiber is easily oriented in the flow direction of the base paper at the time of manufacture. The direction parallel to the flow direction is called the machine direction (MD), and the direction perpendicular to this is called the transverse direction (CD). Generally, the machine direction has a higher tensile strength and a lower elongation. In the specification of Japanese Patent Application No. 2004-36019, it is described that in the case of a normal vulcanized fiber, the longitudinal elongation is about 8 to 12% and the lateral elongation is about 15 to 22%. Therefore, when applied as a sheet pallet, it is generally desirable that the lateral direction be the load application direction of the sheet pallet, depending on the physical properties of the vulcanized fiber.

In the specification of Japanese Patent Application No. 2004-36019, in the case of a normal vulcanized fiber, the tensile strength is about 115 to 130 MPa (11.5 to 13 kg / mm ² ) in the longitudinal direction and 50 to 70 MPa (5 to 7 kg in the transverse direction). / Mm ² ) grade. For common thermoplastic resins, because longitudinal tensile strength is several tens of MPa about (10 to 50 MPa in a polyethylene resin (1~5kg / mm ^2), a polypropylene resin 40~80MPa (4~8kg / mm ² Therefore, it can be seen that the tensile strength of the base material layer made of vulcanized fiber is comparable to these existing resins.

  In this way, according to the present invention, it has the same performance as a sheet pallet formed from a synthetic resin that can be used repeatedly for the realization of a recycling-oriented society, and can be recovered from overseas or used overseas. Lightweight and environmentally friendly sheet pallets that can be used temporarily without the need for return and have little impact on deforestation are possible.

1 is a perspective view of a sheet pallet according to an embodiment of the present invention. It is typical sectional drawing of the sheet | seat pallet shown in FIG. It is a schematic diagram which shows the manufacturing method of a base material layer. It is a schematic diagram which shows the manufacturing method of the sheet pallet by the extrusion lamination method.

DESCRIPTION OF SYMBOLS 1 Sheet pallet 1a Sheet | seat part 1b Tab part 2 Base material layer 3 Adhesion layer 4 Anti-slip layer S1 Loading surface S2 Back surface

Claims (2)

  A sheet pallet with a base layer containing vulcanized fibers.   The sheet pallet according to claim 1, further comprising an anti-slip layer having a larger coefficient of static friction than the base material layer on the loading surface.

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