JPH0476846B2 - - Google Patents

Description

Claim 1: A band-shaped plastic material used for wrapping a group of coin cylinders stacked in a line with the ends protruding, the ends of which have greater heat absorption than the middle part, and which are heated. 1. A plastic film used for wrapping coins, characterized in that the ends of the film shrink more quickly than the middle parts when the film is folded.

2. The film according to claim 1, wherein an endothermic pigment is embedded in the end portion.

3. The film according to claim 1 or 2, wherein a perforation line extending in the longitudinal direction is formed substantially in the center.

Description This invention relates to a plastic film used for wrapping coins.

U.S. Pat. No. 3,491,507 proposes the use of a heat-shrinkable material to wrap coins, and the heat-shrinkable material envelops a group of cylinders of coins stacked in a line. At this time, the heat-shrinkable material is heated over the entire length of the group of cylinders of the coin and tightly engages the circumferential surface of the group of cylinders. In packaging obtained in this way, the heat-shrinkable material tends to tear at the ends of the coin cylinders, and in addition, printing to indicate, for example, the financial period of the bank that made the packaging, etc. It is difficult to give enough. This is because the print is distorted due to shrinkage of the heat-shrinkable material. Also, the resulting packaging was hard and inflexible.
The drawback is that it is difficult to open.

The present invention aims to facilitate packaging and to overcome the above-mentioned drawbacks of the prior art.

Objects and advantages of the invention will be further described and made clearer in the following description.

In order to achieve the above object, in this invention, a film band made of plastic material is wrapped around a group of coin cylinders so that its ends protrude from the ends of the group of cylinders of a coin, and the ends of the film cylinder group are This product provides a film made of plastic material used for packaging in which the film is heated in the vicinity and shrinks to the ends of the cylinder group of the film. When exposed to heat, the ends absorb heat and contract more quickly than the middle.

The accompanying drawings illustrate a portion of this specification and, together with the description, serve to explain the principles of the invention. In the figures, Fig. 1 is a side view showing the group of coin cylinders in the first step of the method of the invention, and Fig. 2 shows the next step, in which the film is heated at its ends for shrinkage. , FIG. 3 is a perspective view showing the entire package, FIG. 4 is a plan view showing a part of the plastic film band of the present invention, FIG. 5 is a sectional view showing the printed film, and FIG. FIG. 3 is a side view showing the manufacturing process of the film.

Embodiments will be described below with reference to figures.

1 to 3, a film strip 11 of plastic material is wrapped around a group of cylinders 10 containing coins stacked in a line. The film need not be of materials commonly used in conventional packaging, such as polyethylene or polypropylene. For this envelope, a group of cylinders is supported between supports 12, rolled in the direction shown by arrow 13, and a plastic film strip of appropriate length is wrapped around it. The width of the cylinder group is such that its end 14 protrudes from the end of the cylinder group 10.

In the next step shown in FIG. 2, the area containing the end 15 of the film strip is heated to an appropriate temperature to cause shrinkage. In FIG. 2, the heating area is limited by heating means 15. As such a heating means, one equipped with an electric radiation heater or a nozzle that blows hot air onto the ends of the cylinder group is used. During this heating, the cylinder group wrapped in the film band is rotated. The results are shown in FIG. That is, as a result of heating the plastic, the ends 15 shrink onto the ends 15 of the coin cylinders.

When carrying out the method of the present invention, even if some printing occurs, it will not be distorted. This is because the intermediate area between the limited ends of the package that is locally heated is not heated at all and therefore does not shrink into cylinders.

The coin packaging thus obtained is very easy to open. Furthermore, it is safe and can withstand rough handling when transported in large bags or boxes.
However, if the perforation line 16 is formed in the center of the film, it becomes even easier to open. That is, since the perforation line is provided, the package can be easily opened from the center, and since the film band has not contracted into a group of cylinders, the coins inside can be easily removed by cutting the package in two along this perforation line.

According to the present invention, the film for carrying out the above-described method has a shape as shown in FIG. As the material, materials commonly used for packaging such as polyethylene and polypropylene can be used. The end portion 17, for example, a portion having a width of 5 to 7 mm is formed to have greater heat absorption than the intermediate portion 18. That is, an endothermic material is embedded or applied to this end 17. As such an endothermic material, one containing a metal or metal oxide pigment can be used. Additionally or alternatively, the end portion 17 may be made opaque by applying a dark color or the like. The intermediate portion 18 may be printed to provide desired information. The width of the end portion 17 is adjusted so that when the film strip is aligned with the center of the group of cylinders and covers the latter end, it protrudes from the latter end. Because the end portion 17 is more endothermic than the middle portion 18, heating the end portion heats the end portion more quickly, causing rapid shrinkage at the end portion while the middle portion 18 is largely unaffected by heating. get up. Then, as shown in FIG. 3, the end portion 17 is bent over the end portion of the cylinder group by about 3 to 5 mm. When this state is reached, the heat radiation is immediately stopped so that the intermediate portion 18 is not affected.

Preferably, the plastic film strip is transparent to prevent fraud by inserting iron washers or iron rods in place of coins inside the package. In other words, if the package is made transparent, the contents can be visually inspected from the outside without tearing the package.

The films can also be stacked as shown in FIG. That is, one surface of the inner layer 19 is printed as shown by the line 20, and this surface is covered with a transparent outer layer 21. Further, the inner layer 19 may also be made transparent for the above-mentioned reasons, but it is not necessarily necessary to make it transparent. When wrapping the cylinder group with a film, the outer layer 21 is placed on the outside to prevent the printing from being damaged or worn out.

The arrangement shown in Fig. 5 can be further advanced to the arrangement shown in Fig. 6. Prior to combining the films constituting the inner and outer layers 19 and 21, the inner layer film is pre-stretched so that the laminated film is curved. As a result, during packaging, the film band wraps well around the cylindrical group of coins, making packaging easy.