Unlock instant, AI-driven research and patent intelligence for your innovation.

Release method in the production of polyvinyl alcohol solution cast film

A polyvinyl alcohol solution, polyvinyl alcohol technology, applied in the direction of flat products, household appliances, other household appliances, etc., can solve problems such as film defects, achieve convenient and easy demoulding, and improve the effect of use and application performance

Active Publication Date: 2015-10-28
SOUTH CHINA UNIV OF TECH
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a release method in the production of polyvinyl alcohol solution cast film, to overcome the film defects and deficiencies that are easy to occur and occur in the existing polyvinyl alcohol solution cast film production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The stainless steel strip is frosted so that the surface roughness is Ra = 0.4; Rz = 3.2; ▽8.

[0020] Use the treated steel strip to cast polyvinyl alcohol solution to dry the template, and use the polyvinyl alcohol aqueous solution without adding any release agent to evenly cast it on the steel strip and control the temperature in four zones of 120 / 140 / 160 / 150 ℃ After the area is dried, the formed polyvinyl alcohol film can be detached from the drying steel strip without hindrance, and the polyvinyl alcohol film also has anti-blocking and easy-to-open properties after being rolled. However, it is extremely difficult to release the template of the stainless steel strip with high surface finish after casting and drying of the same polyvinyl alcohol solution.

Embodiment 2

[0022] The stainless steel strip is processed by cold-rolling rough rolls, so that the surface roughness is Ra = 6.3; Rz = 25; ▽4.

[0023] The steel strip treated by this method is used for polyvinyl alcohol solution casting and drying template, and the polyvinyl alcohol aqueous solution without any release agent is uniformly cast on the steel strip and controlled by four zones of 120 / 140 / 160 / 150 ℃. After drying in the warm area, the formed polyvinyl alcohol film can be detached from the drying steel strip without hindrance, and the polyvinyl alcohol film also has anti-blocking and easy-to-open properties after winding. However, it is extremely difficult to demould after the same polyvinyl alcohol aqueous solution is tape-casted and dried to form a film using a template with a mirror-surface high-gloss stainless steel strip.

Embodiment 3

[0025] The steel roller is roughened by sandblasting to make it a matte pearl silver surface, and its surface roughness is Ra = 0.8; Rz = 6.3; ▽7.

[0026] Usage The treated steel roll is used for polyvinyl alcohol solution casting and drying template roll, and the polyvinyl alcohol solution without any release agent is uniformly cast on the steel belt and dried at 95 ℃, the formed polyvinyl alcohol film can be Detached from the drying steel roll without hindrance, the polyvinyl alcohol film is also anti-blocking and easy to open after winding. However, it is extremely difficult to release the mold after casting and drying the same polyvinyl alcohol aqueous solution to form a film using a mirror-surface high-gloss steel roller.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a de-molding method in the production of polyvinyl alcohol solution tape casting films. The de-molding method is characterized in that surface coarsening of dry steel bands or steel rollers used in the tap casting production process is carried out. The surface coarsening of the steel bands or the steel rollers is carried out through technologies comprising scrubbing, drawing, sandblasting, embossing and the like, and the surface roughness of the processed steel bands or steel rollers is Ra0.2-Ra12.5 and Rz1.6-Rz50, and the surface smoothness of the processed steel bands or steel rollers is del9-del3. The processed surfaces of the steel bands or the steel rollers practically are delustring or semi-delustring surfaces, and there is no adhesion between the dry polyvinyl alcohol films on the surfaces of the steel bands or the steel rollers and the template steel bands or the steel rollers, so the de-molding is extremely convenient and easy.

Description

technical field [0001] The invention relates to a release method in the technical field of film production by polyvinyl alcohol solution casting method, in particular to a release method for continuous production of water-soluble film by polyvinyl alcohol (PVA) solution casting method. Background technique [0002] Due to the hydrolysis and degradation characteristics of polyvinyl alcohol (PVA), as well as its water solubility, it has become an environmentally friendly, safe and green material; in addition to water solubility, polyvinyl alcohol (PVA) has good compactness and high crystallinity , Strong adhesion, the film made of it is not only flexible and smooth, non-electricity, but also oil-resistant, solvent-resistant, wear-resistant, gas-barrier, and can be water-resistant after special treatment. Widely used in the packaging of water transfer printing (approval), computer embroidery, pesticides, fertilizers, pigments, fuels, detergents, water treatment agents, mineral ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B29C41/42B29L7/00
Inventor 崔跃飞
Owner SOUTH CHINA UNIV OF TECH