Heat-shrinkable polystyrene based resin film roll and method for production thereof, and heat-shrinkable label

A technology of polystyrene resin and polystyrene, which is applied in the direction of thin material processing, photoplate making process of patterned surface, instruments, etc., and can solve problems such as poor heat resistance, natural shrinkage, and heat resistance decline

Inactive Publication Date: 2004-11-03
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the adhesive stress at the time of installation in the container varies depending on the location, which is the cause of poor heat resistance even if a film with excellent heat resistance is used in the heater
In addition, when the film has low-temperature shrinkability, that is, if the shrinkage temperature is set low, there will be problems such as increased natural shrinkage in the state before packaging or a decrease in heat resistance after shrinkage and installation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115]Calcium carbonate particles with an average particle diameter of 1.0 μm as a lubricant are compounded and mixed with syndiotactic polystyrene (weight average molecular weight 300,000) copolymerized with 40 mol% of 4-methylstyrene as a constituent component so that the content reaches 0.05% by weight main resin raw material sheet, styrene-butadiene block copolymer (rubber component) raw material sheet formed by copolymerizing styrene as a constituent component to 40% by weight, and The shape and size of the raw material sheet of high styrene rubber (styrene-butadiene copolymer rubber, containing 85wt% styrene as a constituent) of the modifying agent of solubility adjustment are set as shown in table 2, and are fed with quantitative screw The feeder is fed according to the weight ratio of 65 / 30 / 5 (main resin / rubber component / modifier), and the raw material pieces are mixed in the hopper with an inclination angle of 70 degrees directly above the extruder. The raw material s...

Embodiment 2

[0117] The shape and size of the raw sheet are shown in Table 2, and the modifying agent is: styrene-grafted styrene formed by graft-copolymerizing styrene in styrene-butadiene copolymer (25% by weight of styrene content) - Butadiene rubber (graft ratio: 100% by weight), the fluctuation range of the surface temperature when forming a film is set to be an average temperature of ±0.8°C in the preheating process, and an average temperature of ±0.5°C in the stretching process, A film roll was obtained in the same manner as in Example 1 except that the average temperature was within the range of ±0.8° C. in the heat setting step.

reference example 1

[0127] The shape and size of the raw material sheet are shown in Table 2. The polystyrene of the main resin is syndiotactic polystyrene without copolymerization components, and the mixing ratio of the main resin, rubber components and modifiers is set to 50 / 50 / 0 weight ratio (main resin / rubber component / modifier), a film roll was obtained in the same manner as in Example 1.

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Abstract

A film roll comprising a heat-shrinkable polystyrene based resin film wound into a roll, characterized in that, each of the samples taken out from the roll exhibits, in a heat shrinkage test under the condition of the immersion in a hot water at 85 DEG C. for 10 sec, a heat shrinkage rate in the main shrinking direction of within +-5% relative to an average rate of the total samples; a heat-shrinkable polystyrene based resin film taken from the roll; a heat-shrinkable label comprising the film; a method for producing the heat-shrinkable polystyrene based resin film roll which comprises using raw material chips having a specific form, or using a hopper having a specific shape for feeding raw material chips to an extruder, or limiting the variation of the surface temperature of a film in a specific production step to a specific range.

Description

technical field [0001] The present invention relates to a heat-shrinkable polystyrene-based resin film roll obtained by winding a heat-shrinkable polystyrene-based resin film suitable for use as a packaging material for covering, bundling, and sealing containers, and a method for producing the same. Heat shrinkable label. Background technique [0002] Since the heat-shrinkable film has a so-called shrinkable function, it can be laminated and integrated on the object through the film's own shrinkage force and formability without the use of fixing mechanisms such as adhesives and fastening tools. Therefore, it can not only protect the object mechanically through lamination and covering, but also has functions such as binding and sealing. Furthermore, when the heat-shrinkable film itself has a special function, it can be added to the object by post-processing such as lamination. This property can be effectively utilized in the field of packaging whose main purpose is to prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C63/42C08J5/18
CPCC08J2325/04B29C63/42B29K2025/00C08J5/18Y10T428/1328
Inventor 武川善纪伊藤胜也早川聪多保田规米田茂野濑克彦
Owner TOYOBO CO LTD
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