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A method for preparing polyvinyl alcohol film using multiple coating film forming process

A technology of polyvinyl alcohol film and polyvinyl alcohol, which is applied in the field of casting polyvinyl alcohol film to achieve the effects of increasing drying speed, improving film forming efficiency and stabilizing coating accuracy

Active Publication Date: 2020-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method can effectively improve and solve the deficiencies and defects existing in the existing production technology of polyvinyl alcohol film, increase the production speed and efficiency by more than 30%, and improve the tolerance accuracy. %; Simultaneously, do not need to use release agent in the inventive method, adopt PET film as base film, easy and smooth release film after drying, improved the outward appearance quality of polyvinyl alcohol film, guaranteed the normal heat-sealing of polyvinyl alcohol film simultaneously performance and printability

Method used

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  • A method for preparing polyvinyl alcohol film using multiple coating film forming process
  • A method for preparing polyvinyl alcohol film using multiple coating film forming process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The polyvinyl alcohol film was prepared using a multiple-coating film-forming process, using 2 figure 1 The process modules shown are connected in series for 2 times of precision coating and film production, which specifically includes the following steps:

[0038] (1) Through the precision coating die, the polyvinyl alcohol aqueous solution (solid content of 18%) is precisely coated on the PET film (thickness is 30μm, width is 1200mm), and the two sets of process modules are connected in series to form the film thickness. Both are 10µm (the thickness is 20µm after the secondary coating is formed), and the coating width is 1200mm; it is dried through the hot air drying channel, and the temperature is controlled in 6 sections for drying. 80 / 100 / 120 / 140 / 160 / 120°C, cool down to 30°C after drying;

[0039] The conveying speed of the PET film is all 50m / min, and finally a polyvinyl alcohol film with a thickness of 20µm is formed on the PET film; the moisture content of the ...

Embodiment 2

[0043] The polyvinyl alcohol film was prepared using a multiple-coating film-forming process, using 3 figure 1 The process modules shown are connected in series for 3 times of precision coating and film production, which specifically includes the following steps:

[0044] (1) Through the precision coating die, the polyvinyl alcohol aqueous solution (solid content of 15%) is precisely coated on the PET film (thickness is 60μm, width is 1500mm), and the thickness of the precision coating film is 10μm (after The thickness of the film after three times of coating is 30µm), and the coating width is 1500mm; it is dried through the hot air drying channel, and the temperature is controlled in 6 sections for drying. According to the order of introduction, the first and third process modules are divided into The temperature of the segment is 90 / 105 / 125 / 145 / 165 / 120℃, the temperature of the second process module is 100 / 120 / 140 / 150 / 160 / 120℃, and it is cooled to 28℃ after drying;

[0045] ...

Embodiment 3

[0049] The polyvinyl alcohol film was prepared using a multiple coating film-forming process, using 1 figure 1 The process module shown is repeated 3 times for precision coating and film production, which specifically includes the following steps:

[0050] (1) Through the precision coating die, the polyvinyl alcohol aqueous solution (solid content of 25%) is precisely coated on the PET film (thickness is 100μm, width is 300mm), and the thickness of the precision coating film is 15μm (after three times. The thickness of the film after coating is 45µm), and the coating width is 300mm; it is dried through the hot air drying channel, and the temperature is controlled in 6 sections for drying. / 120℃, cooled to 25℃ after drying;

[0051] (2) Repeat the operation of step (1) twice, the thickness of the coating film is 15 μm, and the other conditions are the same;

[0052] The conveying speed of the PET film is 30m / min, and finally a polyvinyl alcohol film with a thickness of 45µm i...

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Abstract

The invention discloses a method for preparing a polyvinyl alcohol film by using a multi-coating film forming process. The method comprises the following steps of: (1) precisely coating a polyvinyl alcohol aqueous solution on a PET film through a precision coating die head, and carrying out drying through a hot air drying channel; and (2) repeating the operation of the step (1) for more than one time, carrying out stripping and film removal, strengthening drying, and carrying out shaping and winding to obtain the polyvinyl alcohol film. The method provided by the invention can effectively improve and solve the shortages and defects existing in the prior art for producing the polyvinyl alcohol film to ensure that the production speed and the efficiency are improved by more than 30%, the tolerance precision is improved, and the thickness tolerance of the film is less than or equal to 5%; meanwhile, in the method, a release agent is not added, a PET film is used as a base film to ensure smooth film stripping after drying, so that the appearance quality of the polyvinyl alcohol film is improved, and simultaneously the normal heat seal performance and printing performance of the polyvinyl alcohol film is ensured.

Description

technical field [0001] The invention relates to the technical field of the production of polyvinyl alcohol films by a casting method, in particular to a method for preparing polyvinyl alcohol films by using multiple coating film-forming processes. Background technique [0002] Due to the hydrolysis and biodegradation properties and water-soluble properties of polyvinyl alcohol (PVA), it becomes a safe, green and environmentally friendly material; in addition to its outstanding water-soluble properties, polyvinyl alcohol (PVA) has high crystallinity. Therefore, it has the characteristics of good compactness and high adhesion at the same time. The film prepared from it is not only flexible and smooth, polar and non-charged, but also oil-resistant, solvent-resistant, wear-resistant and gas-barrier. Therefore, it is widely used in the packaging of computer embroidery, water transfer printing, pesticides, fertilizers, pigments, fuels, detergents, water treatment agents, mineral a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L29/04
CPCC08J5/18C08J2329/04
Inventor 崔跃飞李少香
Owner SOUTH CHINA UNIV OF TECH
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