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Roll of water-soluble polyvinyl alcohol film and method of storing the same

A polyvinyl alcohol film, polyvinyl alcohol-based technology, applied to flexible coverings, other household appliances, applications, etc., can solve the problems of film deformation, lower yield, and inability to completely prevent moisture absorption, etc., to achieve suppression of deformation or wrinkle Crease generation and effect of reducing residual stress

Active Publication Date: 2010-03-24
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, in order to prevent PVA films from absorbing moisture, optical PVA films and the like are packaged with highly moisture-proof packaging materials (Patent Document 4), or are designed to use dehumidifiers, etc., but water-soluble products that absorb moisture more easily than optical PVA films In the case of permanent PVA film, moisture absorption cannot be completely prevented by these methods, and if an attempt is made to unfold the stored roll, deformation or wrinkles will occur in the film, which will reduce the yield in the factory. Happening

Method used

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  • Roll of water-soluble polyvinyl alcohol film and method of storing the same
  • Roll of water-soluble polyvinyl alcohol film and method of storing the same
  • Roll of water-soluble polyvinyl alcohol film and method of storing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] By containing 88 mol % of saponification degree, PVA 15 weight parts of polymerization degree 1700, glycerin 0.65 weight part PVA concentration is the aqueous solution of 15 weight % casting on the conveyer belt, while blowing the hot air of 120 ℃ on the belt, dry 5 After 10 minutes, the film was obtained, and then, the film was passed on a metal roller that had been satin-finished (150 mesh sandblasting), and after embossing was performed on one side, the two ends of the film were cut off by a blade to obtain The film width (W) is 500 mm, the film thickness (M) is 30 μm, the roughness of the embossed surface is 0.3 μm, and the roughness of the non-embossed surface is 0.15 μm. Velocity 0.5m / sec, cut-off value λc=0.8 for measurement) PVA film {length (L) 1000m (no remainder)}, through initial winding tension 15kgf, winding speed 40m / min, contact pressure 3kgf / m 2, Taper 75%, wind this PVA film on a cylindrical paper tube [outer diameter (D) of the paper tube (D) 88.2mm, ...

Embodiment 2

[0133] In Example 1, except that the winding tension when the PVA film is wound on the paper tube is set to 10kgf, in the same manner as in Example 1, a roll of water-soluble PVA film {roll section of the roll Diameter (H) 228mm}. In the same manner as in Example 1, the obtained rolls were packaged into double coils using a low-density polyethylene film, and then stored in a warehouse for half a year as in Example 1. After storage, the water-soluble PVA film obtained from the roll taken out from the package was unfolded. Table 1 shows the results of determining the state of deformation and wrinkles of the water-soluble PVA film at this time in the same manner as in Example 1. In addition, when the take-up tension is converted into the take-up tension of the film per 1 m film width, the value is 20 kgf / lm width.

Embodiment 3

[0135] In Example 1, except that the take-up speed when the PVA film is wound on the paper tube is set to 50m / min, in the same manner as in Example 1, a roll of water-soluble PVA film {roll Section diameter (H) 219mm}. In the same manner as in Example 1, the obtained rolls were packaged into double coils using a low-density polyethylene film, and further stored in a warehouse the same as in Example 1 for half a year. After storage, the water-soluble PVA film obtained from the roll taken out from the package was unfolded. Table 1 shows the results of determining the state of deformation and wrinkles of the water-soluble PVA film at this time in the same manner as in Example 1.

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Abstract

The invention provides a roll of a water-soluble PVA film which has no or little slackness or creasing; and a process for producing the roll. The roll is formed from a water-soluble polyvinyl alcoholfilm which dissolves in 20 DEG C water with stirring. The film, when examined after a drying step, has a plasticizer content and water content of 1-30wt.% and 1-10wt.%, respectively, and gives a rollin which the proportion of the interstices between the film layers is 4-25%. In a subsequent winding step, this film is wound on a cylindrical core at a film winding tension of 5-40 kgf per meter of the width to form a roll. A film unwound from this roll has a total width of deformed parts extending in the width direction for the film of 10% or smaller based on the overall width of the film.

Description

[0001] related application [0002] This patent application was filed in Japan on May 14, 2007, and the priority of Japanese Patent Application No. 2007-127486 is claimed, and the whole thereof is referred to as a part of this patent application. technical field [0003] The present invention relates to a roll of water-soluble polyvinyl alcohol-based film, a method for producing the roll, and a method for storing the roll. Background technique [0004] Water-soluble polyvinyl alcohol-based film (hereinafter, polyvinyl alcohol-based film is abbreviated as PVA film, and the polyvinyl alcohol of its raw material is also referred to as PVA for short) has been widely used in the packaging of agricultural chemicals or cleaning agents (patent documents 1~ 3) and other fields of application. [0005] The water-soluble PVA film used in such applications is wound into a roll to make a roll after production, temporarily stored, and then transported to a processing plant, where the fil...

Claims

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Application Information

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IPC IPC(8): C08J5/18B65D65/46C08K3/38C08L29/04
CPCB65D65/46B29C41/26B29D7/01C08J5/18C08J2329/04C08K3/38C08L29/04C08L2203/16
Inventor 小田英晶细田直祐
Owner KURARAY CO LTD
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