A composite material sewing thread for sewing polyphenylene sulfide filter bags

Abstract

The invention relates to a composite sewing thread for sewing polyphenylene sulfide filter bags. The composite sewing thread is obtained in the manner that teflon filaments and polyphenylene sulfide yarns are mixed and subjected to doubling and twisting, and then the mixture is coated with hot-melt liquid colloid matter. According to the composite sewing thread, sewing stitch holes of filter bags can be effectively filled, so that dust penetrating into dust removal filter bags is reduced, and the filter efficiency of filter materials is improved.

Description

Technical field [0001] The invention belongs to a special sewing thread used for sewing filter bags, in particular to a composite material sewing thread used for sewing polyphenylene sulfide filter bags. Background technique [0002] In the field of controlling industrial waste gas pollution and reducing the haze to the atmospheric environment, the emission control of coal-fired power plants is an important aspect. In recent years, the main technical means to control the emission of solid particles in the exhaust gas of coal-fired power plants are bag dust removal technology and electric and bag integrated dust removal technology, because these two technologies involve the use of dust removal filter bags and are suitable for coal-fired power plants The filter material for discharge filtration conditions is preferably polyphenylene sulfide (PPS) filter material or a filter material compounded with polyphenylene sulfide fiber and other high-performance fibers, such as a mixture of ...

AI Technical Summary

Problems solved by technology

However, while the polytetrafluoroethylene sewing thread meets the requirements of temperature resistance, chemical and mechanical functions of the filter bag, there is also a derivative problem that plagues filter bag manufacturers, that is, the problem of dust leakage from the sewing pinholes of the filter bag.

Specifically: Because the polyphenylene sulfide fibers used in the manufacture of filter materials are generally selected to meet the needs of high filtration efficiency, the fine fibers with a linear density between 1.5 and 3dtex are generally selected. These fibers feel softer and have a lower initial modulus. , there is a material characteristic of poor recovery after deformation

During the sewing process, the filter material shows that after the needle is pierced out of the pinhole, the fibers on the edge of the pinhole are less resilient and reset. After the sewing thread passes through, there will still be pinhole gaps around the suture; plus PTFE The surface of vinyl sewing thread is smooth, and the self-lubricating property of the material can lead to low cohesion between the thread and the filter material, resulting in the sewing thread not being able to solidify the dust particles blocked by the pinhole well and becoming a pinhole blocking body

Therefore, when the filter bag is working in the dust collector, due to the pressure of the discharge air, the dust can still penetrate through the pinhole clearance and enter the discharge, thus affecting the filtration efficiency

In order to overcome this shortcoming, most of the filter bag manufacturers currently use silica gel to manually smear and block the pinholes, and reprocess the sewing stitches of the filter bags. Although good results can be achieved, it results in a large amount of labor waste

And if the filter material company switches to a thicker sewing thread in order to block the pinhole, in addition to the need to increase the material cost, as mentioned above, the self-lubricating and non-adhesive properties of PTFE are also difficult to completely prevent dust from passing through. Escape after passing through the pinhole will also affect the filtration efficiency

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