Two-way stretching mold for polytetrafluoroethylene hollow fibrous membrane

A technology of polytetrafluoroethylene and biaxial stretching, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as hollow fiber collapse and hollow fiber rupture, and achieve small pore size and high porosity Effect

Inactive Publication Date: 2019-04-12
CHANGYUAN ELECTRONICS DONGGUAN +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] U.S. Patent No. 4,496,507 provides a stretching device using slotted hot rollers. In this device, heating rollers are used for temperature control, and one hollow fiber is stretched at a time. During the stretching process, the hollow fiber is prone to breakage and hollow fiber collapse. And other issues

Method used

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  • Two-way stretching mold for polytetrafluoroethylene hollow fibrous membrane
  • Two-way stretching mold for polytetrafluoroethylene hollow fibrous membrane
  • Two-way stretching mold for polytetrafluoroethylene hollow fibrous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] see Figure 1 to Figure 3 , a polytetrafluoroethylene hollow fiber membrane biaxial stretching mold, comprising an outer mold 1, a core mold 2, an expansion outer mold 3, and an expansion core mold 4.

[0047] The outer mold 1 and the core mold 2 are installed and fixed at the outlet end of the pushing equipment (not shown).

[0048] The inside of the outer mold 1 is dug to be provided with the outer mold through hole 12 that runs through front and back.

[0049] The outer mold through hole 12 includes an outer mold through hole rear section 122 and an outer mold through hole front section 124 that communicate with each other from back to front.

[0050] The rear section 122 of the through hole of the outer mold is in the shape of a truncated cone, and its diameter gradually becomes smaller from the back to the front.

[0051] The front section 124 of the through hole of the outer mold is cylindrical and has a constant diameter.

[0052] The core mold 2 is installed ...

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Abstract

The invention discloses a two-way stretching mold for a polytetrafluoroethylene hollow fibrous membrane. The mold comprises an outer mold, a core mold, an expanding outer mold and an expanding core mold; an outer mold through hole penetrating through frontward and backward is dug in the outer mold; the core mold is fixedly installed in the outer mold through hole; a longitudinal stretching throughpassage with the back wide section and the front narrow section is formed between the outer mold and the core mold; the expending outer mold is installed on the front end portion of the outer mold; an expanding outer mold through hole penetrating through frontward and backward is dug in the expanding outer mold; the expanding core mold is installed on the front end portion of the core mold; the expanding core mold is fixedly installed in the expanding outer mold through hole of the expanding outer mold; a vertical and horizontal two-way stretching passage with the same width is formed betweenthe expanding outer mold and the expanding core mold; the longitudinal stretching passage is communicated with the vertical and horizontal two-way stretching passage. The polytetrafluoroethylene hollow fibrous membrane is stretched transversely and longitudinally, and therefore the polytetrafluoroethylene hollow fibrous membrane with the smaller hole diameter and high porosity can be obtained simply and efficiently.

Description

technical field [0001] The invention relates to a stretching die for a hollow fiber membrane, in particular to a bidirectional stretching die for a polytetrafluoroethylene hollow fiber membrane. Background technique [0002] Hollow fiber membranes are widely used in membrane separation fields such as reverse osmosis, ultrafiltration, microfiltration, membrane contactors and membrane reactors. Common hollow fiber membrane materials include cellulose acetate, polyvinyl chloride, polypropylene, polyethylene, polyacrylonitrile, polysulfone, polyethersulfone, polyvinylidene fluoride, etc. Different applications put forward different requirements for hollow fiber membranes, including requirements for membrane pore size, porosity, mechanical properties, and corrosion resistance. [0003] PTFE has excellent properties such as strong acid and alkali resistance, oxidation resistance, microbial erosion resistance, and high and low temperature resistance. In addition to the excellent p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/08B01D67/00
CPCB01D67/0013B01D69/08B01D71/36
Inventor 许宇权李可涛鲁雪莲
Owner CHANGYUAN ELECTRONICS DONGGUAN
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