JP2000296845A - Logistics board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a hard-to-slip and smooth carrying work to every kind of loaded articles by forming an article distribution board of at least two layers of a loading surface layer of which the coefficient of dynamic friction to a gloss surface of aluminum foil is a specified value, and a non-loaded surface layer of which the main component is a polyolefin based resin. SOLUTION: This article distribution board by which a safe an smooth loading/unloading can be performed while preventing loaded articles from falling down, by using a push-pull forklift, is formed of two layers of a loading surface layer 9 of which the coefficient of dynamic friction to a gloss surface of aluminum foil is 0.75 or higher, and a non-loaded surface layer 10 of which the main component is a a polyolefin based resin. As the loading surface layer 9, a resin of which the main component is a polyolefin based thermoplastic elastomer is preferably used, and more preferably, a resin of which the major component is a resin wherein the shear melting viscosity under conditions of a temperature of 230 deg.C, and a shear speed of 20 sec-1, is 600-5000 Pa.s is used. By this constitution, fear wherein loaded articles collapse during transport is eliminated, and a safe and smooth loading/unloading is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution board capable of handling a load safely and smoothly by using a push-pull forklift without slipping a load.

[0002]

2. Description of the Related Art A package consisting of various goods or products is placed on a sheet-like table, and a member called a platen is attached.
It is common practice to carry cargo by so-called push-pull forklifts. The sheet-like table on which these loads are loaded is generally called a sheet pallet or a slip sheet. FIGS. 3 and 4 show examples of a conventional sheet pallet. 3 and 4, a sheet pallet 1 is a loading surface 2 for loading a load, a non-loading surface 3 on the back side thereof, and a portion that is gripped or nipped by a forklift grip. And a gripping part 4 called a part. FIG. 5 shows one mode of handling a load by a forklift using the sheet pallet. In FIG. 5, in order to support a load 5, a platen 6 is inserted under the sheet pallet 1, the whole is lifted, and transported by a forklift 7. When lowering the load 5, the platen 6 is pulled out of the sheet pallet 1 on which the load 5 is loaded, and if necessary, only the sheet pallet 1 is pulled out of the load 5 while holding the grip portion 4. Such a cargo handling operation is generally called a sheet save. In order to improve the sheet save property, for example, Japanese Utility Model Publication No. 6-46831 proposes a sheet pallet in which the friction coefficient of the loading surface layer is reduced. ing.

[0003]

However, depending on the application, there is a case where the sheet pallet is not pulled out from the load even when the cargo is loaded and carried using the push-pull forklift, that is, the sheet storability is not required. There are the following problems when carrying cargo without pulling it out. (1) Conventional sheet pallets require a sheet-saving property, so the loading surface layer is slippery, and the load is shifted during transportation by truck or the like. There is. (2) If the luggage is an intermediate product in the production of a product and it is required to place it on a production line using a robot or the like with high accuracy, smooth movement becomes difficult due to a load shift. (3) The misalignment causes friction between the sheet pallet and the luggage, thereby reducing the commercial value of the product. The present invention has been made in order to solve the above-mentioned drawbacks of the conventional sheet pallet, and has as its object to provide a distribution board that is less slippery with respect to any load and that can smoothly carry cargo. I do.

[0004]

According to the present invention, there is provided at least two layers, a loading surface layer having a dynamic friction coefficient of 0.75 or more with respect to a glossy surface of an aluminum foil and a non-loading surface layer mainly composed of a polyolefin resin. It is intended to provide a logistics board. The present invention also provides a distribution board in which the loading surface layer is a resin containing a polyolefin-based thermoplastic elastomer as a main component. Further, the present invention has a shear melt viscosity of 6 at a temperature of 230 ° C. and a shear rate of 20 sec-1.
Another object of the present invention is to provide a distribution board having a loading surface layer whose main component is a resin having a thickness of 00 to 5000 Pa · s.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The loading surface layer of the physical distribution sheet of the present invention has a dynamic friction coefficient of 0.7 against the glossy surface of aluminum foil.
It is necessary to be 5 or more. Further, in order to obtain a sufficient frictional resistance without being affected by a change in the surface state such as exposure of the loading surface or slight adhesion of a foreign substance, the friction coefficient is set to 0.1.
More preferably, it is 90 or more. The coefficient of friction is 0.
If it is less than 75, a sufficient anti-slip effect is not exhibited, which is not preferable.

As the loading surface layer of the present invention, a polyolefin-based thermoplastic elastomer or a polyolefin-based resin having a rubber component is used in order to obtain a sufficient effect as an adhesive and a non-slip when melted with the non-loading surface layer. Examples of the main component include a resin. Specific examples include an ethylene / α-olefin copolymer resin and a resin obtained by completely or partially cross-linking polypropylene and ethylene propylene rubber. These may be used alone or as a mixture. Examples of commercially available resins include "Engage" manufactured by Dupont Dow Elastomer Co., Ltd., "Oleflex" manufactured by Nippon Polyolefin Co., Ltd., "Cataroy Super Soft Type KS Series" manufactured by Montel Polyolefin Co.,
Sumitomo Chemical's "Sumitomo TPE", Mitsubishi Chemical's "Thermorun", "SPX", Mitsui Chemical's "Milastomer",
"Gudmer" and the like.

The loading surface layer has a temperature of 230 ° C.
Shear melt viscosity at a shear rate of 20 sec-1 is 6
It is more preferable that the resin is 00 to 5000 Pa · s. If the ratio is out of this range, there is a possibility that problems such as a decrease in the adhesive strength between the layers and an uneven thickness of the molded product may occur. The thickness of the loading surface layer is 0.05 to
The thickness is preferably 5.00 mm, but is more preferably 0.20 to 1.0 mm from the viewpoint of moldability, strength retention, cost, and the like.

The resin of the non-stacking surface layer in the present invention preferably contains a polyolefin resin as a main component in order to adhere to the stacking surface layer at the time of melting and to maintain the performance as a distribution board. Examples of the polyolefin resin include a homopolymer of ethylene, a homopolymer of propylene, a homopolymer of butylene, a copolymer of ethylene and an α-olefin, and a copolymer of propylene and an α-olefin. The weight average molecular weight of these polyolefin resins is generally 10,000 to 1,000,000, preferably 20,000 to 500,000, and particularly preferably 50,000 to 300,000. These polyolefin-based resins are a catalyst system (Ziegler catalyst) obtained from a transition metal compound and an organoaluminum compound, or a catalyst obtained by supporting a chromium compound (eg, chromium oxide) on a carrier (eg, silica). It is obtained by homopolymerizing or copolymerizing an olefin using a system (Phillips catalyst) or a radical initiator (for example, an organic peroxide). These may be single or a mixture.

The strength of the non-stacking surface layer is not particularly limited because it varies depending on the thickness and area of the load, the distribution board, etc., and further according to the required performance. Further, the resin constituting the loading surface layer and the non-loading surface layer is a stabilizer generally used in the synthetic resin field for oxygen and heat, light, and a filler (for example, mica, talc, glass, organic fiber, Carbon), a flame retardant or the like may be added to use as a composite material. The stacking surface layer and the non-stacking surface layer need to be adhered to each other at the time of molding, and in order to further enhance the adhesiveness, a small amount of a resin that is a main component of each layer may be mixed with each other. Further, in order to improve the productivity, burrs and unnecessary portions which are generated at the time of forming the distribution board may be pulverized and recycled to be mixed with the non-stacking surface layer within a range not to impair the physical properties of the product. In addition, a recycling layer is provided in the middle.
It may have a structure of more than layers. Considering the recycling of plastic, if the physical properties required for the product are obtained, a recycled resin mainly composed of a polyolefin resin may be used or mixed in the non-stacking surface layer. The distribution board uses a laminated sheet of two or more layers obtained by general multilayer T-die molding or the like in plastic molding.

[0010]

Next, examples of the present invention will be described, but the present invention is not limited to these examples. The shear melt viscosity was measured in accordance with JIS K7199, under the conditions of a barrel die of 9.55 mm, a capillary range of 10 mm, a capillary die of 1.0 mm, and a temperature of 230 ° C. at a shear rate of 6.08 to 243.20 sec-1.
The value at a shear rate of 20 sec-1 was read. Dynamic friction coefficient is 63 × 63m in accordance with JIS K7125.
m, 200 g of the sliding piece is attached to the non-loading surface of the distribution board cut to the same size as the sliding piece, and the loading surface of the distribution board and the mating material (thickness 100 μm, double-sided glossy aluminum foil)
Was measured under the conditions of a test speed of 100 mm / min. Adhesion strength conforms to JIS Z1707, sample width 15mm, pulling speed 300mm / min, 1
It was measured by 80 ° bending peeling.

As a resin for the loading surface layer, an ethylene / octene copolymer resin (Engage D8150) having a shear melt viscosity of 3500 Pa · s (hereinafter referred to as “elastomer 1”) has a shear melt viscosity of 3300 Pa · s. Polyolefin-based thermoplastic elastomer (Oleflex T400GN) (hereinafter, referred to as “elastomer 2”), and polyolefin-based thermoplastic elastomer having a shear melt viscosity of 630 Pa · s (Cataroy Super Soft Type KS-359P) (hereinafter, referred to as “Elastomer 3”) )
Was used. For comparison, a shear melt viscosity of 400
Ethylene / octene copolymer resin having Pa · s (Engage D8130) (hereinafter referred to as “elastomer 4”)
Was used. As a resin for the non-loading surface, "Jiaromer PS470L" (hereinafter, referred to as "PP") manufactured by Japan Polyolefin Co., Ltd. was used.

Examples 1 to 3 Using each of the elastomers shown in Table 1, a feed block type extruder having an extruder having a screw diameter of 65 mmφ for forming a loading surface layer and a screw diameter of 98 mmφ for forming a non-loading surface layer was used. Using a layer sheet molding machine, molding was performed at a discharge resin temperature of 230 ° C. with a die having a width of 1400 mm, and passed through a multi-stage cooling roll having a mirror surface having a temperature of 100 ° C. or less to produce a two-layer sheet. The thicknesses of the loading surface layer and the non-loading surface layer were 0.5 mm and 2.0 mm, respectively.
The obtained sheet was processed into the distribution board shown in FIGS. 1 and 2, the board has a square shape with rounded corners, and the dimensions of the loading surface 2 are X = 1420 mm, Y
= 1120 mm and W = 1200 mm. The extension width of the holding section 4 is Z = 60 mm. This holding unit 4
The forklift is bent upward with respect to the loading surface 2 so as to be held by the gripper (8 in FIG. 5). The dynamic friction coefficient and the adhesive strength at the layer interface of each of the obtained distribution boards were measured. Table 1 shows the results.

Example 4 The same operation as in Example 1 was performed except that a resin obtained by mixing PP and a resin obtained by pulverizing and regenerating the distribution board of Example 1 at a weight ratio of 7: 3 was used as the non-stacking surface layer. Was. Table 1 shows the evaluation results.

Comparative Example 1 The same operation as in Example 1 was tried except that the elastomer 4 was used for the loading surface layer, but the formed film on the loading layer surface was unstable and a sheet having a desired thickness could not be obtained.

Comparative Example 2 A single-layer sheet of PP having a thickness of 2.5 mm was prepared and evaluated.
Table 1 shows the results.

[0016]

[Table 1]

[0017]

The logistics board of the present invention is useful because there is no fear that the load collapses during transportation, and safe and smooth handling of the load can be performed using a push-pull forklift.

[Brief description of the drawings]

FIG. 1 is a front view of a distribution board showing one example of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a perspective view showing a conventional sheet pallet.

FIG. 4 is a perspective view showing another conventional sheet pallet.

FIG. 5 is a diagram illustrating a use state of a conventional sheet pallet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Distribution board (sheet pallet) 2 Loading surface 3 Non-loading surface 4 Grasping part 5 Load 6 Platen 7 Forklift 8 Gripper 9 Loading surface layer 10 Non-loading surface layer

Continued on front page (72) Inventor Mitsuhiro Imaizumi 3-2 Chidori-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Denko KK R & D Center Kawasaki Laboratory F-term (reference)

Claims (4)

[Claims] 1. A distribution board comprising at least two layers: a loading surface layer having a coefficient of kinetic friction with respect to a glossy surface of an aluminum foil of 0.75 or more, and a non-loading surface layer containing a polyolefin resin as a main component. 2. The distribution board according to claim 1, wherein the loading surface layer is a resin containing a polyolefin-based thermoplastic elastomer as a main component. 3. The loading surface layer has a shear melt viscosity of 600 at a temperature of 230 ° C. and a shear rate of 20 sec-1.
The distribution board according to claim 1, wherein the main component is a resin having a pressure of Ｐａ5000 Pa · s. 4. The distribution board according to claim 1, wherein the thickness of the loading surface layer is 0.05 to 5 mm.