After finishing knitted fabrics Common quality problems and preventive measures-Iota

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News > Dynamic industry > After finishing knitted fabrics Common quality problems and preventive measures

After finishing knitted fabrics Common quality problems and preventive measures

① reach should feel: soft finish soft style with customer requirements differ, such as soft, smooth, fluffy, soft waxy, oily, dry slippery, use of different softener based on different styles. Such as film, there are different structures softener film, its softness, bulkiness, slip, yellowing case, the effects of different water-absorbent fabric etc; in a silicone oil, modified silicone oil properties of different modified genes are different, such as silicone oil, hydroxy silicone oil, epoxy-modified silicone oil, carboxyl-modified silicone oil and the like properties are different.
② yellowing discoloration: Usually the film a certain structure and amino silicone oil amino cause yellowing. In the film, the cationic film soft good, feel good, easily adsorbed on the fabric, but yellowing discoloration, hydrophilic effect, such as the cationic film converted into a soft spirits, which will greatly reduce the yellowing, hydrophilic there improvement, such as cationic silicone film with a hydrophilic compound or complex with hydrophilic finishing agent, will improve its hydrophilic.
Anionic or nonionic film film not yellowed, some non-yellowing film, does not affect the hydrophilic.
Amino silicone oil is currently the most widely used oil, but amino cause yellowing discoloration, yellowing greater the higher the ammonia value, it should use low yellowing amino silicone or polyether-modified, epoxy-modified so difficult pan yellow silicone oil.
Further, when the emulsion polymerization is sometimes used as a cationic surfactant as emulsifier 1227,1831,1631, these emulsifiers will produce yellowing.
When using an emulsifier different silicone emulsion, the "stripping effect" is different, will cause the peel color and light color under different circumstances, has been part of discoloration.
③ fabric hydrophilicity decreased: generally lack structural problems and the film after silicone deposition using absorbent genes, as well as closed-hydroxy cellulose fibers, wool on the carboxyl, amino, etc. These absorbent absorption center causing decreased, due Selection may be anionic, nonionic and hydrophilic type silicone film.
④ dark spots: The main reason is oil before treating fabrics not go to the net, oil staining at the darker color; or dye bath mixture too much foam, foam and flower sweater, stick to the fabric dyes; or defoamers floating oil resulting dark oil spots; or vat of tar-like substance into the fabric; or dye in different situations integrated condensate dark spots; or excessive water quality calcium and magnesium ions combine with the dye stick to fabric and other reasons. To targeted for processing, as applied to oil when refined before processing, dyeing auxiliary low-foam, no foam additives, defoamers select varieties of easily floating oil, add chelating agents to improve water quality, increase solubilization dispersant Anti-dye aggregation, timely and clear cylinder cylinder washing agent tank clean.
⑤ shallow spots: The main reason is the pre-treatment is uneven, poor capillary effect of some areas, a certain dye exclusion, OR with exclusion staining substances, calcium soap, magnesium soap with a cloth or pre-treatment or mercerized uneven, uneven drying or semi-finished products, or cloth coated with sodium sulphate, soda ash and other solid undissolved, or drop in Sheung Shui before drying dyed or dyed fabric softening treatment after finishing with a time of auxiliaries stains. Likewise must be targeted treatment, such as strengthening the pre-treatment, must be easy to form when the pre-treatment chemicals, calcium and magnesium soap selection, thorough pre-treatment must be uniform (this selection and scouring agent, penetrating agent, chelating dispersant, mercerizing penetrant and other relevant ), sodium sulfate, sodium carbonate, etc. must be of good into the cylinder and the need to strengthen production management.
⑥ base spot: The main reason is after pre-treatment (such as bleaching, mercerization) or to base the net is not uneven, resulting in plaque produce base, it is necessary to strengthen the base of the pretreatment step process.
⑦ softener stains: the causes about the following:
a. Poor film of material, there are massive adhered to the fabric softener;
b. After the film of the material too much foam in the cylinder when the cloth, fabric softener foam tape stains;
c. Poor water quality, high hardness, water impurities and binding lectin on the fabric softener. Even make the fabric with stains after some plants with hexametaphosphate or alum-treated water, these substances and impurities in the water formed floc into a flexible treatment bath;
d. Cloth with anionic species, in the soft processing, and combined into a cationic softener stains or cloth with alkali, so softener cohesion;
e. Softener different structure, causing some softening into slag from emulsified state was adhered to the fabric, and so at higher temperatures.
f. Cylinder original tar-like substance falling softener stick to the fabric.
⑧ silicone oil stains:
This is a kind of stains difficult to deal with, mainly due to:
a. Oil on less than neutral PH value, especially with the base, acausing the silicone oil demulsification floating oil;
b. Treatment baths poor water quality, high hardness, silicone oil in> 150PPM hardness of water floating oil easily;
c. Problems include poor quality silicone emulsion (emulsifier select poor, poor emulsification process, too emulsified particles, etc.), intolerance shear (mainly silicone itself quality problems, such as silicone oil emulsion system, silicone varieties, silicone synthesis process, etc. ).
You can choose shear resistance, electrolyte resistance, resistance to change PH silicone oil, but be careful of silicone oil usage and the environment, but also have considered hydrophilic silicone oil.
⑨ fluff poor: poor raising operations (such as tension control, pile roller speed, etc.) is closely related with raising machine for raising it, the softener (commonly known as wax), the control fabric of dynamic and static coefficient of friction The key, therefore raising softener preparation is the key, if softener poor, a direct result of raising the poor, and even cause broken or width changes Alhambra.a

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