Keflux fine gradient filter needle felt and its production method

Abstract

The invention discloses a Keflux fine gradient filter needle-punched felt and a manufacturing method thereof. The Keflux fine gradient filter needle felt includes an outer glass fiber layer, a reinforced base cloth layer, an inner glass fiber layer and a polytetrafluoroethylene filter layer from outside to inside, and the surface of the polytetrafluoroethylene filter layer is coated with A coupling drug layer is provided. The production method includes the following steps: firstly, the outer glass fiber layer, the reinforced base cloth layer and the inner glass fiber layer are stacked together from the outside to the inside, and the three-layer base material is pierced with a puncture needle, and the three-layer base material is pierced by the barb on the thorn needle. The fibers between the substrates are entangled together to combine the three-layer substrates; then the PTFE filter layer is needle-punched to the inner surface of the above-mentioned three-layer substrates; finally, the coupling agent solution is applied to the PTFE filter The surface of the layer forms a coupling drug layer. The product of the invention has the advantages of high air permeability, high filtration precision, long service life and low defect generation rate, and is beneficial for wide popularization and application in industry.

Description

technical field [0001] The invention relates to the technical field of filter cloths, in particular to a Kevlar fine gradient filter needle felt and a manufacturing method thereof. Background technique [0002] At present, there are two main methods of making industrial filter cloth: (1) Mixing glass fiber and base cloth fiber, and then blending into filter cloth specifications (length, width and thickness). Such production is very simple and inexpensive. The disadvantage is that the air permeability is not uniform, because in the process of blending, the mixing ratio of each part is uncontrollable, because the resistance at the lower density is less, so the filter object (smoke) passes through this part correspondingly There will be a lot of them. After a large amount of residue accumulates in this position, the fibers will harden and form hardened defects. If found at this time, it can be replaced. If not found, continue to use. The hardened fibers will break. Holes are ...

AI Technical Summary

Problems solved by technology

The disadvantage is that the air permeability is not uniform, because in the process of blending, the mixing ratio of each part is uncontrollable, because the resistance at the lower density is less, so the filter object (smoke) passes through this part correspondingly There will be a lot of them. After a large amount of residue accumulates in this position, the fibers will harden and form hardened defects. If found at this time, it can be replaced. If not found, continue to use. The hardened fibers will break. Holes are formed, the filter object will be discharged directly without any filtration, and the entire set of filter cloths will fail and must be replaced; (2) The glass fiber and base cloth are needled layer by layer. In order to achieve the purification degree of filtration, increase the number of layers, or even It can be increased to eight to ten layers, and the filtering effect is good, but because of too many layers, the air permeability decreases

It can be seen that simply increasing the number of filter cloth layers will increase the surface area, but the air permeability will decrease, which cannot meet the production needs; moreover, the diameter of the discharge pipe is designed at the beginning of construction, because the discharge is not up to standard, and even Some production lines have to be replaced with thicker exhaust pipes, and the entire production line has to be adjusted