Shrinkable film and method for manufacturing same

A shrink film, degradable film technology, used in chemical instruments and methods, synthetic resin layered products, transportation and packaging, etc., can solve problems such as increased film opacity, aluminum delamination or separation, and reduced productivity, to achieve uniform shrinkage sexual effect

Active Publication Date: 2013-05-08
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the usability of the film deteriorates, causing an increase in opacity of the film, resulting in limited use, and the thermal properties of the blend resin itself lead to a decrease in productivity, and the shrinkage of the final product is difficult to control

Method used

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  • Shrinkable film and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0042] Example 1

[0043] 60% of polylactic acid resin was added as a raw material resin, polylactone (DAICELL Chemical Company, Celgreen), and silica having an average particle size of 2.7 μm so as to be 450 ppm in the final film, and then blended to prepare a master batch. The masterbatch was dried at 110°C for 2 hours by using a hot air dryer, melted at 200°C and extruded, and then rapidly cooled and solidified by a cooling roll at 25°C, thereby preparing an unstretched film.

[0044] The water-dispersed polyurethane coating composition is coated on one surface of the unstretched film through an in-line coating (ILC) process, so that the coating thickness after drying is 0.04 μm. The water-dispersed polyurethane coating composition contains 0.8 wt% of polyurethane resin solids (DKC, Superflex210), 0.1 wt% of a silicon-based wetting agent (Dow Corning, Q2-5212) and the balance of water.

[0045] The unstretched film coated with the water-dispersible polyurethane coating compositio...

Example Embodiment

[0047] Example 2

[0048] Except that 45 wt% of polylactone was used to prepare the masterbatch, a film was manufactured in the same manner as in Example 1, and the physical properties of the film are shown in Table 1.

Example Embodiment

[0049] Example 3

[0050] Except that 30 wt% of polylactone was used to prepare the masterbatch, the film was manufactured in the same manner as in Example 1, and the physical properties of the film are shown in Table 1.

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Abstract

The present invention relates to a film for packaging food and to a method for manufacturing same. More particularly, the present invention relates to a film for packaging food and to a method for manufacturing same, wherein the film has superior flexibility, transparency, and biodegradability, and has excellent adhesion to a metal coating layer to achieve improved moisture barrier properties.

Description

technical field [0001] The following disclosure relates to a food packaging film and its manufacturing method, and more specifically, to a film capable of excellent adhesion to a metal deposition layer and thereby maintaining excellent moisture resistance while having high flexibility, transparency A food packaging film with high performance and biodegradability and a method for manufacturing the same. Background technique [0002] Petroleum-derived polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyester, etc. are used to make conventional plastic shrinkable films. Since these shrinkable films are chemically and biologically stable, they take a very long time to decompose, which causes serious environmental problems. [0003] Currently, conventionally used biodegradable shrinkable films are mainly made of polylactic acid, but their use is limited because of their low shrinkage and brittleness due to a crystallization phenomenon during film manufacturing. In...

Claims

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Application Information

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IPC IPC(8): B32B15/08B32B15/20B32B27/04C08J7/043
CPCC08J2367/04C08J7/04C08J2475/04B32B27/08C08J7/045Y10T428/265Y10T428/31565Y10T428/31605C08J7/0423C08J7/043C08L67/04C23C14/20B29C55/08B32B15/09
Inventor 金东珍金时敏金允照宋起相
Owner KOLON IND INC
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