Dust collector bag production process First, the dust bag filter material weaving processing
1, the filter material fiber weaving methods
Different filter materials using different weaving methods of its use performance and effects vary widely, so the choice of weaving method is also very important.
The plain weave method
The plain weave method is made by weaving the warp and weft yarns one by one from top to bottom. The fabric has no directionality. The yarns change the distance between the contact points. When the force is applied, they are not easily deformed and elongated, but the plain fabric has poor air permeability and pressure loss. Large, difficult to clean, easy to plug, and plain weave used as filter material is rarely used.
Twill weave
The twill weave is woven from two or more warps and wefts. The surface is twill-like. The yarn is easily dislocated after being stressed, and the elasticity is better. As a filter material, it has good wear resistance, less clogging, high processing air volume, dust removal efficiency and dropping dust effect.
satin fabric
satin fabric has the advantage of twill fabric elasticity, weave pattern is flat, compared with plain, twill more easily cleaned, good luck, low pressure loss, but the dust removal efficiency is low.
tens of thousands of needles with hooked teeth are fixed on a machine that can be used to sprint up and down quickly.
Each of the needles consists of a combed fiber layer (composed of one or more types of short fibers). The assembly layer) uses the needle’s hook teeth to spur each fiber onto the base fabric and the piles of fibers at the upper and lower ends of the base fabric, and they are wound around each other to form a high-strength three-dimensional felt. Fabric-like material, after the post-treatment and surface treatment, can be made into filter mat filter material, which is called needle felt. Needle felt felt has the best air permeability in four kinds of fabrics, and the efficiency of dust removal bags is the most common weaving method for making filter materials.
2. Filter material post-treatment process
According to different filter fiber and use conditions, some treatment of filter material can effectively improve the performance of filter material. Such as surface singeing, calendering, heat setting, water and oil repellent, dipping, film coating, antistatic treatment, etc.
singeing, dawning
The singeing and calendering treatments use high temperature or roller compaction to smooth one side of the filter media and improve the cleaning performance of the filter media. However, this treatment method tends to bring about changes in the air permeability of the filter media.
heat setting treatment
Heat setting treatment is to pre-treat the spinning filter material at a high temperature. The shrinkage of the textile filter material in a high temperature environment causes a change in the size of the filter bag and maintains the dimensional stability.
waterproof and oil treatment
Waterproof and oil-repellent treatment is to treat the filter material in the waterproof and oilproof agent to improve the performance of the filter material in the aqueous and oil-containing medium.
impregnation
Impregnation is carried out by soaking the filter in a PTFE solution and then drying. Improve the filter temperature and chemical resistance.
film
The film is covered with a layer of expanded PTFE film on the surface of the filter material, which is hot-melted or bonded. This layer has a high porosity and a small pore size, which improves dust removal efficiency and can be almost zero emissions.
fire flowers, anti-static
Fireproof, anti-static treatment is to put some metal fibers in the filter material to improve the conductivity of the filter material, so that the filter material can release the charge in time when the static electricity generated. In order to avoid sparks, explosions of flammable and explosive materials are caused.
3, bag sewing line requirements
The dust removal bag is made of acid-resistant suture thread and consists of an alkali-free glass fiber yarn, a modified polyaryeloxadiazole fiber yarn in parallel, and a twist. The surface of the suture line is twisted and coated on the surface of the sewing line by a coating processor. The fluoroethylene mixed solvent was coated with polytetrafluoroethylene (PTFE) as the main component of the surface of the sewing line with a thickness of ≤ 1 mm. The alkali-free glass fiber yarn is 8 strands of 80 alkali-free glass fiber yarns, and the modified polyaryioxadiazole fiber yarn is 8 strands of 80 modified polyaramide biazole fiber yarns. The tetrafluoroethylene mixed solvent is a mixture of PTFE emulsion, epoxy-modified silicone softener, silane coupling agent and water. The beneficial effect is that due to adopting the alkali-free glass fiber yarn and the modified polyaromatic diazole fiber yarn, the flame retardant property is good, and the polytetrafluoroethylene film coated on the surface increases the acid and alkali resistance of the product and satisfies the requirement. The need for manufacturing industrial dust bags for the flue gas high temperature filtration industry