JPH0344895B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sheet for forming a shrinkable sleeve,
The present invention aims to provide a material suitable for a shrinkable sleeve for covering and protecting glass bottles containing carbonated drinks and the like.

Conventionally, the outer surface of a glass bottle, etc. is covered with a sleeve made of a heat-shrinkable synthetic resin sheet, and the sleeve is shrunk by heating to cover the outer surface of the glass bottle, etc., so as to cover the outer surface of the glass bottle, etc. Efforts are being made to provide buffer protection.

Particularly in the case of glass bottles subjected to internal pressure such as carbonated beverages, it is an important safety issue to prevent breakage as well as to prevent bottle fragments from scattering when broken.

However, the various synthetic resin sheets conventionally used as materials for sleeves have been unsatisfactory, as they are poor in either their cushioning protection properties or their properties in preventing scattering of bottle fragments. For example, non-foamed sheets such as polyvinyl chloride sheets and stretched polystyrene sheets are effective in preventing bottle fragments from scattering, but they are inferior in their ability to cushion and protect bottles from shock and vibration during transportation, and foamed sheets such as expanded polystyrene sheets Although the sheet had excellent cushioning properties, it had poor elongation and tensile strength, so it had little effect on preventing bottle fragments from scattering and was not practical.

In particular, conventional sheets adhere completely to the surface of the bottle, so when the bottle breaks due to impact from a fall, the sheet is also cut and crushed at the same time, and the bottle fragments are easily scattered.

Therefore, the present invention improves the properties of the foam sheet and provides a sleeve material that is excellent in both cushioning protection and prevention of scattering of bottle fragments. It is characterized by a concave pattern formed on one side of a foamed sheet of plastic resin.

Next, embodiments of the present invention will be illustrated below with reference to the drawings.

Reference numeral 1 denotes a sheet for forming a shrinkable sleeve, which is made of a foamed sheet of thermoplastic resin such as foamed polystyrene or foamed polyolefin, and has so-called heat-shrinkable properties that shrinks when heated.

The above-mentioned shrinkability is imparted by stretching when the foam sheet is manufactured by extrusion molding, or by a subsequent stretching process after molding.

On one side of the sheet 1, 10 is a concave pattern, and in the case of the figure, a large number of parallel grooves with a square cross section are formed over the entire surface of the sheet (first
(see Figures and Figure 2).

However, the cross-sectional shape of the groove is not only rectangular but also triangular (see Figure 3) or arc-shaped.
Furthermore, it is also possible to use a serrated structure in which triangular grooves are closely formed (see FIG. 4).

Moreover, instead of parallel grooves in one direction, grid-like grooves may be formed in both vertical and horizontal directions to form the concave pattern 10 (see FIG. 5).

Formation of the concave pattern 10 as described above is performed on the sheet 1
The sheet 1 may be formed by embossing, or it may be extruded using a breaker bridge type mold or a grooved mold during extrusion molding of the sheet 1, and the grooved mold may be made rotatable. You can leave it there.

In addition to polystyrene, materials for the shrinkable sleeve forming sheet 1 include crosslinked or non-crosslinked polyethylene or polypropylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, etc.
Foamed sheets made of various thermoplastic resins alone, copolymers, or mixed resins can be freely used. Since the surface of the foamed sheet on which the concave pattern 10 is not formed is smooth, printing can be applied thereto, and a non-foamed film made of polystyrene or other thermoplastic resin is laminated on the surface. is also possible.

The sheet 1 for forming a shrinkable sleeve of the present invention described above is cut into predetermined dimensions and then cut into a concave pattern 1.
It is wound into a cylindrical shape with 0 facing inside, and both ends are joined to form a cylindrical sleeve A. Furthermore, at this time,
When the concave pattern 10 is a parallel groove oriented in one direction, it is preferable to form the groove so that the direction of the groove is in the axial direction of the sleeve A (see FIG. 6).

After this sleeve A is placed over a glass bottle G for carbonated drinks, etc., the sleeve A is heated to shrink the breve A and tightly cover the glass bottle G, thereby protecting the glass bottle G. .

Therefore, the surface of the sheet 1 on which the concave pattern 10 is formed comes into contact with the surface of the glass bottle G, and a small space 2 is formed between the bottle surface and the concave pattern 10 (see FIGS. 7 and 7). (See Figure 8).

According to the sheet 1 for forming a shrinkable sleeve of the present invention configured as described above, when a glass bottle G is shrink-covered and used, the shrinkable sleeve forming sheet 1 can prevent volumetric expansion or deformation of the bottle G on the verge of breaking when the bottle G is damaged. sheet 1
Due to the space created by the concave pattern 10, the sheet 1 does not deform at the same time as the bottle G, but the sheet 1 deforms and expands with a slight delay from the deformation of the bottle G.

Therefore, part of the force of scattering the bottle fragments when the bottle G is broken is absorbed by the delayed deformation of the sheet 1, which has the effect of shortening the scattering distance of the bottle fragments, improving safety when the bottle breaks. becomes possible.

Further, the concave pattern 10 has various practical values, such as being effective in buffering and protecting the bottle G against shock and vibration.

[Brief explanation of drawings]

The figures illustrate embodiments of the present invention, and FIG. 1 is a plan view, FIG. 2 is an enlarged sectional view, and FIG.
4 and 4 are respectively cross-sectional views of modified examples, FIG. 5 is a plan view of further modified examples, FIG. 6 is a perspective view of the sleeve, FIG. 7 is a longitudinal cross-sectional view of the sleeve in use, and FIG. 8 is a cross-sectional view of the modified example. It is a diagram. 1... Shrinkage sleeve forming sheet, 10... Concave pattern, A... Sleeve, G... Glass bottle.

Claims (1)

[Scope of Claims] 1. A sheet for forming a shrinkable sleeve, characterized by forming a concave pattern on one side of a foamed sheet of a thermoplastic resin having shrinkability. 2. A sheet for forming a shrinkable sleeve according to claim 1, wherein the concave pattern comprises a number of parallel grooves. 3. A sheet for forming a shrinkable sleeve according to claim 1, wherein the concave pattern consists of vertical and horizontal lattice-like grooves. 4. A sheet for forming a shrinkable sleeve according to claim 1, which is a foamed sheet in which a shrinkable non-foamed film is laminated on the opposite side to the surface on which the concave pattern is formed.