Compound technique of film filtering material and equipment

Abstract

The invention provides a composite technique for membrane filter material and an equipment. Polytetrafluoroethylene membrane and glass fiber base cloth are synchronously input between the heating roller and the press roller of a composite equipment at a speed ranging from 3 to 5m per min, and the polytetrafluoroethylene membrane is input in the direction of the tangent between the heating roller and a lower press roller and is formed by hot pressing with a linear pressure ranging from 15 to 30kN / m at the temperature ranging from 260 to 360 DEG C; after the membrane filter material formed by the hot press is heated by the one-fourth surface of the heating roller and then is formed by hot pressing with a linear pressure ranging from 15kN / m to 20kN / m. The technique method realizes rubber-free hot pressing compounding of the polytetrafluoroethylene membrane and the glass fiber base cloth, thus effectively saving the original physical and chemical property of the polytetrafluoroethylene membrane, enhancing the permeability and filtration efficiency of the membrane filter material, strengthening the composite strength of the membrane filter material and extending the service life of themembrane filter material; simultaneously, the hot pressing composite equipment has reasonable structure, thus ensuring the production and preparation of the membrane filter material.

Description

technical field [0001] The invention relates to a compound process and equipment for membrane filter materials, specifically, a compound process and equipment for compounding polytetrafluoroethylene membranes and glass fiber base cloth through high-temperature hot pressing to form new membrane filter materials. Background technique [0002] Polytetrafluoroethylene (PTFE) membrane is a new type of filter material with excellent chemical stability, smooth surface, high and low temperature resistance, acid and alkali resistance, not easy to age, permanent durability, oil and water repellency, good air permeability, and the surface of the membrane There are more than 9 billion micropores in a square inch, and the diameter of the micropores is 0.03 to 3 μm. Even the smallest dust particles are difficult to pass through. The filter bag made of polytetrafluoroethylene (PTFE) coated filter material, when filtering, the dust will not penetrate into the interior of the fabric, the fil...

AI Technical Summary

Problems solved by technology

However, the current composite process is usually: use viscose (such as: PUR glue, etc.) to compound the polytetrafluoroethylene film and the glass fiber base cloth, and then heat it at a temperature not higher than 120°C and a pressure of 0.1-0.5MPa. Pressing and setting; this composite process has the following disadvantages: first, poor air permeability and low filtration efficiency

Due to the use of viscose, the micropores of the viscose part of the membrane are blocked, thereby reducing the air permeability and filtering effect of the membrane; the second is that the membrane is easy to peel off and the compound is not firm

Although both polytetrafluoroethylene and glass fiber have good chemical stability, the high temperature resistance of viscose is poor, especially in high temperature filtration conditions, the membrane and the base cloth are easily separated, thus reducing the use of membrane filter materials life

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