JPS62158670A - Packaging material and packaging method thereof - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a packaging material made of a thermoplastic resin film used for packaging various articles, particularly raw rubber such as natural rubber or synthetic rubber, and a method for packaging the same.

(Prior art) Conventionally, raw rubber, which is essential as a raw material for tires, etc., has been packaged in bales as shown in Figure 1 in order to prevent contamination by foreign objects, etc., and to prevent the raw rubber from sticking together and making it easier to handle. The entire surface is packaged in a bag shape mainly using polyethylene film 1. In the figure, 2 is a raw rubber veil, and 3 is a hot sealing part.

(Problems to be Solved by the Invention) The individual bales of raw rubber wrapped in the above-mentioned polyethylene film are stacked in multiple stages on a pallet 4 in batches of several dozen bales as shown in FIG. Since the surface of the polyethylene film l is smooth, when the raw rubber hales 2 are stacked on each other without any gaps, the polyethylene films 2 are in close contact with each other, and the pallet 4
There was a problem in that it was very difficult to take out the hale 2 from the container, resulting in poor workability.

To improve workability, depending on the type of raw rubber, a lubricant (so-called powdering) can be applied to the surface of the film, but the use of lubricants not only poses problems of environmental pollution, but also causes excessive powdering. There is also a risk of the load collapsing.

In addition, the packaging material for the raw rubber is kneaded with the rubber as it is without being stripped from the heel during the kneading process.
It is necessary that the material has a low melting point and is inexpensive (for example, the above-mentioned polyethylene film) that can be melted during kneading.
From the viewpoint of the quality of such compounded rubber, it is not preferable to easily change to a material that has less mutual adhesion.

In view of the above problems, it is an object of the present invention to provide a packaging material and a packaging method that have good workability because they do not stick to each other, and also have good storage properties without causing the articles to collapse.

(Means for Solving the Problems) The packaging material 'r4 of the present invention is made of a thermoplastic film, and is characterized in that at least one side of the film is roughened. This method is characterized in that the article is packaged so that the roughened surface is located on the outside.

(Function) When articles packaged with the thermoplastic resin film of the present invention are stacked on top of each other, the rough surfaces (small protrusions) on the film surface create air between the films, eliminating adhesion between the films. The rough surface (small protrusions) digs into adjacent items, causing physical snags and making them difficult to slip.

(Example) The present invention will be described in detail below using an example with reference to the drawings.

In FIG. 3, the thermoplastic resin film 10 can be a polyethylene film, a polybutadiene film, or the like. The thermoplastic resin film 10 has at least one side roughened by a known embossing method and has a large number of small protrusions 11. FIG. 3(A) shows a state in which only one side is roughened, and FIG. 3(B) shows a state in which both sides are roughened. The shape, size, density, etc. of the small protrusions (or irregularities) 11 are determined by the shape and weight of the packaged articles, and basically when packaged articles are stacked on top of each other, air is present between the films, or Any type of material may be used as long as the small protrusions bite into the adjacent article and cause it to get caught. For example, when packaging soft rubber heel that is prone to cold flow, such as butadiene rubber, which is a synthetic rubber, the embodiment shown in FIG. 4 may be used. The height of the small protrusion was made comparatively higher (for example, 6
0μ or more), the small protrusions will bite into the smooth surface of the adjacent hel, preventing the load from collapsing (see Table 1 below).

In this case, the veil can be easily taken out regardless of the height of the small protrusions. The reason is thought to be that the sliding friction coefficient becomes smaller due to the presence of air between the polyfilms. In addition, when packaging relatively hard synthetic rubber (for example, styrene/butadiene rubber/oil black masterbatch) made by pre-blending carbon/oil into a master hatch, for example, Figs. 4 and 6 or Figs. If the process is carried out in the manner shown in Fig. 7 and the height of the small protrusions is designed to be relatively low (for example, 10μ to 20μ), adjacent roughened films will slide well against each other and the bale will be easy to take out without dusting (see below). (See Table 2). In this case, the problem is related to the height of the small protrusions (the load is difficult to collapse. The reason is that the masterbatch itself is difficult to cold flow, and the protrusions of the film increase the coefficient of static friction. The results of a comparative experiment on workability (ease of removal from loading pallets) and storage (degree of prevention of cargo collapse) of raw rubber wrapped in polyethylene film and conventional polyethylene film with a smooth surface are as follows: Met.

2) The roughened surface of the thermoplastic resin film 10 is intended to prevent the films from sticking to each other as described above, so the roughened surface is shown in FIGS. 4 to 7. The article 12 must be packaged so that the is located on the outside. In the embodiment shown in FIG. 4, one side of the article 12 is covered with a single-sided roughened film 10 with the rough surface facing outward, and the other side of the article 12 is covered with a conventional film 13 having a smooth surface, so that the entire article 12 is shaped like a bag. It is packaged in

FIG. 5 shows a state in which both sides of the article 12 are covered with single-sided roughened films 10 with the roughened surfaces facing outward, and the article 12 is packaged in a bag shape as a whole. FIG. 6 shows a state in which one side of the article 12 is covered with a double-sided roughened film 10, the other side of the article 12 is covered with a conventional film 13 having a smooth surface, and the whole article is packaged in a bag shape. FIG. 7 shows a state in which both sides of the article 12 are wrapped with double-sided roughened films 10 in the form of a bag. In each figure, numeral 14 is a hot-sealed part by mechanical packaging. The embodiments shown in FIGS. 4 and 6 have the advantage that the brand of the packaged article, etc. can be displayed (printed) smoothly on the surface 13, and the embodiments shown in FIGS. When the packaged article 12 is raw rubber, especially synthetic rubber, the film 1 is caused by rubber flow (cold flow) during storage or handling.
Each is particularly preferred since it has the advantage of reducing the risk of zero damage.

The present invention can be used to package various articles other than the raw rubber mentioned above. For example, for articles that are conventionally packaged in polyethylene bags and stacked in multiple stages, the present invention can be used instead of the polyethylene bags. Packaging materials can be used.

(Effects) As mentioned above, the packaging material of the present invention is made of thermoplastic resin,
The film has a structure in which at least one side is roughened, and the packaging method involves packaging the article with the roughened surface of the packaging material located on the outside, which improves workability and storage. Remarkably superior.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing raw rubber bales packaged in a bag shape using conventional polyethylene film, and Fig. 2 is a front view showing raw rubber bales stacked in multiple stages on a pallet.
FIG. 3(A) is a partial cross-sectional view of the single-sided roughened film of the present invention, FIG. 3(B) is a partial cross-sectional view of the double-sided roughened film of the present invention, and FIGS. 4 to 7 are the partial cross-sectional views of the double-sided roughened film of the present invention. It is sectional drawing which shows each Example of the packaging method. lO... Roughened thermoplastic resin film, 11.
... rough surface (small protrusions or irregularities), 12 ... article <raw material rubber hale), 13 ... thermoplastic resin film with smooth surface. Patent applicant: Sumitomo Rubber Industries, Ltd. Oats Tire Co., Ltd.

Claims (5)

[Claims] (1) A packaging material made of a thermoplastic resin film, characterized in that at least one side of the film is roughened. (2) The packaging material according to claim 1, wherein the thermoplastic resin film is a polyethylene film. (3) The packaging material according to claim 1, wherein the thermoplastic resin film is a polybutadiene film. (4) Packaging an article using a packaging material made of a thermoplastic resin film, in which at least one side of the film is roughened, so that the roughened surface of the packaging material is located on the outside. A packaging method characterized by: (5) The packaging method according to claim 4, wherein the article is natural rubber or synthetic rubber.