Heat-shrinkable polyester-based film roll

Abstract

The issue is to provide a heat-shrinkable polyester-based film roll that exhibits good winding properties, and in particular, good resistance to winding core wrinkling and end face displacement. The heat-shrinkable polyester-based film roll is characterized by being prepared by winding a heat-shrinkable polyester-based film on a paper tube, the film having a shrinkage rate in a primary film shrinkage direction of 40% or more following treatment in hot water at 90 DEG C for 10 seconds. The heat-shrinkable polyester-based film roll satisfies requirements (1) to (6): (1) the film winding length is 2000-20,000 m; (2) the film width is 400-2500 mm; (3) the film thickness is 5-30 [mu]m; (4) the thickness irregularity at a surface layer part of the film roll in the film width direction is 12% orless; (5) the paper tube has an internal diameter of 3 inches, the difference in clearance of the paper tube in the width direction is 0.5 mm or less after the film is removed from the film roll, andthe flat pressure resistance of the paper tube is 1700 N / 100 mm or more after the film is removed; (6) the average winding hardness of a surface layer part of the film roll in the width direction is 500-850.

Description

technical field [0001] The present invention relates to a film roll obtained by winding a heat-shrinkable polyester film. In more detail, it is related with the heat-shrinkable polyester film roll which improves the wrinkle of the winding core part of a film roll, and has little loss at the time of printing and processing. Background technique [0002] In recent years, stretched films (so-called heat-shrinkable films) made of polyvinyl chloride-based resins, polystyrene-based resins, polyester-based resins, etc. Indicated label packaging, bottle cap sealing, integrated packaging, etc. Among such heat-shrinkable films, the polyvinyl chloride-based film has problems such as low heat resistance, generation of hydrogen chloride gas during incineration, and a cause of dioxin. In addition, polystyrene-based films have problems in that they have poor solvent resistance, require the use of inks with a special composition during printing, and must be incinerated at high temperature...

AI Technical Summary

Problems solved by technology

Among such heat-shrinkable films, polyvinyl chloride-based films have problems such as low heat resistance, hydrogen chloride gas generation during incineration, and dioxins.

In addition, the problem of polystyrene-based film is that it has poor solvent resistance, needs to use special composition ink during printing, and must be incinerated at high temperature, which will be accompanied by foul smell and a large amount of black smoke when incinerated.

[0003] However, heat-shrinkable labels are mostly discarded as garbage in the end, and thinner walls are required from the viewpoint of environmental protection.

As the thickness becomes thinner, the stiffness decreases, and the handling becomes more difficult, so there is a problem in the film roll after slitting the film

Heat-shrinkable films are difficult to handle compared to other general-purpose films, but according to research by the present inventors, defects are particularly likely to occur in heat-shrinkable polyester films with a film thickness of 30 μm or less

Trouble in printing and processing film rolls due to defects

In particular, if wrinkles are generated in the core portion of the film roll, it will cause trouble at this position during printing and processing, and there is a problem of loss.

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