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Manufacture process and apparatus for PTFE supported composite filtering film

A polytetrafluoroethylene and composite filtration technology, applied in the field of filter membranes, can solve the problems of easy deformation, disadvantage, and the inability of polytetrafluoroethylene microporous filter membranes to be self-supporting, so as to improve shrinkage and formability, compact structure, The effect of autoclavable physicochemical properties

Inactive Publication Date: 2008-01-02
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for manufacturing a polytetrafluoroethylene supported composite filter membrane in view of the above-mentioned current state of the art. Through special manufacturing equipment and special manufacturing methods, the supporting material can be effectively laminated to the On the surface of the polytetrafluoroethylene membrane, not only the lamination is firm, but the yield of the product and the service life of the product are improved, and the air permeability of the polytetrafluoroethylene microporous filter membrane is not affected; the present invention overcomes the problem of single polytetrafluoroethylene The microporous filter membrane cannot be self-supporting and easily deformed, which is not conducive to the defects of folding and processing into commonly used pleated filter elements, and maintains the original membrane structure and pore size of the membrane, and has little effect on the air permeability, which greatly improves the filter membrane. Material shrinkage and formability

Method used

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  • Manufacture process and apparatus for PTFE supported composite filtering film
  • Manufacture process and apparatus for PTFE supported composite filtering film
  • Manufacture process and apparatus for PTFE supported composite filtering film

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Example 1: A manufacturing method of a PTFE-supported composite filter membrane, which is manufactured by laminating a PTFE microporous filter membrane with a layer of polypropylene mesh. The manufacturing method is as follows: ① The PTFE microporous filter membrane set on the PTFE microporous filter membrane feed roller and the polypropylene screen set on the support material feed roller are transported to the heated composite roller arranged up and down through the transmission control system. In the pressing device composed of the roller and the cooling composite roller, the PTFE microporous filter membrane is close to the heating composite roller, and the polypropylene screen is close to the cooling composite roller; ②By evenly setting the heating composite roller The heating device composed of 18 halogen lamps in the roller makes the surface temperature of the heating composite roller 300℃, and the cooling device composed of 5 fans arranged in parallel along the axial ...

Embodiment 2

[0020] Example 2: A manufacturing method of a PTFE-supported composite filter membrane. The basic method is the same as that of Example 1. The difference is that in step ②, the surface temperature of the composite roller is heated to 150°C, and the composite roller is cooled. The surface temperature is 85°C, the pressing pressure between the heating composite roller and the cooling composite roller in step ③ is 20 MPa, and the composite linear velocity in step ④ is 15 m / min.

Embodiment 3

[0021] Example 3: A manufacturing method of a PTFE-supported composite filter membrane. The basic method is the same as that of Example 1, except that in step ②, the surface temperature of the composite roller is heated to 230°C, and the composite roller is cooled. The surface temperature is 40°C, the pressing pressure between the heating composite roller and the cooling composite roller in step ③ is 10 MPa, and the composite linear velocity in step ④ is 30 m / min.

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Abstract

The present invention discloses the manufacture process and apparatus for supported composite PTFE filtering film. The manufacture apparatus has heating compounding roller with surface temperature higher than the smelting point of the support material and cooling compounding roller with surface temperature lower than the hot deformation temperature of the support material, so that the support material has its surface molten partially to combine with the microporous PTFE filtering film while maintaining the shape of the support material and the permeability of PTFE filtering film. The composite film has excellent filtering performance and other chemical and physical properties, and the manufacture apparatus is suitable for continuous industrial production of the composite film.

Description

Technical field [0001] The invention relates to a filter membrane, in particular to a manufacturing method of a polytetrafluoroethylene supported composite filter membrane. As a whole microporous filter membrane, this composite membrane still maintains the original membrane morphology and membrane structure. The pore size and air permeability decrease less, and the shrinkage and moldability of the filter membrane material are greatly improved. Background technique [0002] Polytetrafluoroethylene (PTFE) material has outstanding performance among polymer materials; high temperature resistance, acid and alkali resistance, organic solvents, and non-toxic and biocompatibility. When the stretched PTFE microporous filter membrane is used for gas or liquid filtration, it has a larger size than other polymer materials (such as regenerated cellulose, nylon, polyvinylidene fluoride, and polyethersulfone). Open porosity, better particle blocking and durability, and other comprehensive prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D71/36
Inventor 肖通虎陈珊妹
Owner NINGBO UNIV
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