Temperature stage type calendaring film forming method of nonwoven filter cloth

A film-forming method and non-woven fabric technology, applied in separation methods, chemical instruments and methods, filtration separation, etc., can solve the problems of poor film-forming smoothness, poor regeneration effect, and low filtration precision, and achieve high wear resistance coefficient, Fast filtering speed and good finish

Inactive Publication Date: 2013-12-25
LIAONING XUANYUAN FILTRATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the temperature for calendering treatment of non-woven fabrics used in non-woven filter cloths is the softening point temperature of the fibers on the surface of the non-woven fabrics. There are problems such as poor and unstable film-forming smoothness and low wear resistance coefficient, which directly lead to filter cake Difficult to peel off, low filtration accuracy, short service life and poor regeneration effect, etc.

Method used

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  • Temperature stage type calendaring film forming method of nonwoven filter cloth
  • Temperature stage type calendaring film forming method of nonwoven filter cloth
  • Temperature stage type calendaring film forming method of nonwoven filter cloth

Examples

Experimental program
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Embodiment

[0020] The surface fibers of the non-woven filter cloth are polypropylene fibers, the melting point T1 is 170°C and the softening point T3 is 130°C as measured by the melting point instrument (DSC).

[0021] Follow the steps below in turn:

[0022] a. Carry out the first calendering treatment with the melting point temperature T1=170°C of the fibers on the surface of the non-woven fabric as the temperature of the calendering roll;

[0023] b. Carry out the second calendering treatment with the transition point temperature T2=150°C as the calender roll temperature;

[0024] c. Carry out the third calendering treatment with the softening point temperature T3=130°C of the fibers on the surface of the non-woven fabric as the calender roll temperature.

[0025] The pressure and speed of the three calendering treatments are in accordance with the conventional requirements.

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Abstract

The invention discloses a temperature stage type calendaring film forming method of a nonwoven filter cloth. The method has the beneficial effects of stable finish of a formed film, high wearing coefficient, good regeneration effect and high filter precision. The method comprises the following steps in sequence: carrying out first calendaring treatment, with the melting temperature T1 of surface fibers of a non-woven as the temperature of calendaring rolls; carrying out second calendaring treatment, with the transition point temperature T2 as the temperature of the calendaring rolls; carrying out third calendaring treatment, with the softening point temperature T3 of the surface fibers of the non-woven as the temperature of the calendaring rolls, wherein the transition point temperature T2 is equal to (T1+T3)/2+/-5 DEG C.

Description

technical field [0001] The invention relates to a calendering film-forming method of non-woven filter cloth, in particular to a non-woven filter cloth temperature-step calendering film-forming method with stable film-forming smoothness, high wear resistance coefficient, good regeneration effect and high filtration precision . Background technique [0002] Non-woven filter cloth (also known as non-woven filter cloth, needle-punched felt filter cloth) uses non-woven fabric as the filter layer to achieve solid-liquid separation. The surface of the filter cake continues to trap particles, and finally realizes solid-liquid separation. Since the non-woven filter cloth is composed of non-woven fabric and base cloth by acupuncture method, the surface is uneven. In order to improve the surface smoothness of the non-woven fabric, it is necessary to go through calendering to form a film during the processing of the non-woven filter cloth. Processing means that the non-woven fabric pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06C15/00B01D39/08
Inventor 杨玉刚
Owner LIAONING XUANYUAN FILTRATION TECH
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