Void-containing heat-shrinkable polyester film and process for production thereof

A technology of heat shrinking and shrinking direction, used in chemical instruments and methods, flat products, other household appliances, etc., can solve problems such as difficult specific gravity, difficult polystyrene printing, poor perforation unsealing, and achieve good solvent adhesion. and mechanical strength, good shrinkage completion, good perforation unsealing effect

Inactive Publication Date: 2012-05-30
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, polyvinyl chloride has the problem of chlorine gas being generated when it is discarded and incinerated, and polystyrene has problems such as difficulty in printing. Polyester-based heat-shrinkable films that have fewer of these problems have attracted attention.
However, the existing heat-shrinkable polyester film has the following disadvantages: Since it is basically not stretched in the longitudinal direction perpendicular to the main shrinking direction, when it is shrunk and wrapped on a PET bottle or the like as a label, it cannot be stretched along the Perforations tear labels smoothly (i.e., poor perforation unsealing)
In addition, the specific gravity of the polyester film is about 1.4, and when used as a label, there is a problem that it is difficult to separate from the specific gravity of the bottle in water.

Method used

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  • Void-containing heat-shrinkable polyester film and process for production thereof
  • Void-containing heat-shrinkable polyester film and process for production thereof
  • Void-containing heat-shrinkable polyester film and process for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8、 and comparative example 1～8

[0197]

Embodiment 1

[0199] 6% by mass of polyester a and 94% by mass of polyester b were mixed as a layer A, and 45% by mass of polyester b was mixed with 15% by mass of polyester c, 10% by mass of polyester d, and 30% by mass of raw material e. The polyester of the B layer is melted at 280°C, and co-extruded from a T-shaped die so that the layer thickness ratio is A layer / B layer / A layer = 20 / 60 / 20, and quenched on a cooling roll to obtain the thickness An unstretched multilayer film of 160 μm. At this time, the shear speed of the T-shaped die is 150 seconds -1 , The draw ratio is 12.5.

[0200] Then, the unstretched film obtained as described above is introduced into a longitudinal stretching machine in which a plurality of roll groups are continuously arranged, and stretched in the longitudinal direction by utilizing the difference in the rotational speed of the rolls. That is, after the unstretched film is preheated on the preheating roll until the film temperature reaches 85°C, it is rotat...

Embodiment 2

[0204] A biaxially stretched film was continuously produced by the same method as in Example 1, except that the stretch ratio in the longitudinal direction was set to 1.2 times and the thickness of the unstretched multilayer film was set to 125 μm. In addition, the shear rate of the T-die during melt extrusion is 150 seconds -1 , The draw ratio is 14.2. Then, the properties of the obtained film were evaluated by the same method as in Example 1. The evaluation results are shown in Table 4 and Table 6.

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PUM

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Abstract

Disclosed is a void-containing heat-shrinkable polyester film which is composed of at least two layers, wherein at least one of the layers is a polyester resin layer comprising a cyclic polyolefin resin and containing voids. The film has an apparent specific gravity of less than 1.00 and has specified heat shrinking properties and mechanical properties. Also disclosed is a void-containing heat-shrinkable polyester film as mentioned above, which exhibits specified cuttability along a perforation. Further disclosed is a process for producing a void-containing heat-shrinkable polyester film as mentioned above.

Description

technical field [0001] The invention relates to a cavity-containing heat-shrinkable polyester film, in particular to a heat-shrinkable polyester film suitable for labels. In more detail, it relates to a heat-shrinkable polyester film containing a cavity, which is used for the label of a PET bottle. When the label is peeled off from the PET bottle, the label can be easily and smoothly torn along the perforation. It is easy to separate from water when the label is peeled off from the PET bottle, and it is difficult to cause printing processing failure due to insufficient mechanical strength in the flow direction of the film machine (the longitudinal direction of the film, the direction perpendicular to the main shrinkage direction), and the shrinkage is good. . Background technique [0002] As the heat-shrinkable film, especially as the heat-shrinkable film for the label of the bottle body, a film made of polyvinyl chloride, polystyrene, or the like is mainly used. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B29C47/08B29C55/14B29C61/06B29K67/00B29K105/02B29L7/00
CPCB32B2250/40B32B2250/244B29C55/023B29K2023/38C08L67/02B32B27/205B32B2307/54B32B3/266B29C55/005B29K2067/00B32B27/36B32B2307/72B32B2305/026B32B2307/518B32B2270/00B32B27/325B32B2264/0257B32B2305/30B32B2519/00C08L23/02B29K2995/0049B32B27/08B32B2307/75B32B2250/03B32B2307/736B32B2307/5825B32B2250/24B29C55/143B32B2307/412B29K2105/04Y10T428/249953Y10T428/24999C08L2666/06B32B3/26B32B2367/00
Inventor 山本茂知春田雅幸向山幸伸岩崎正一
Owner TOYOBO CO LTD
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