1 can not reach should feel:

The soft style of the soft finish varies with the customer's requirements, such as soft, smooth, fluffy, soft, smooth, slippery, etc. Different softeners are used according to different styles. For example, in the film, softener films with different structures are different in softness, bulkiness, smoothness, yellowing, and water absorbency. In silicone oils, modified silicone oils with different modified genes have different performances. Such as amino silicone oil, hydroxy silicone oil, epoxy modified silicone oil, carboxy modified silicone oil and so on are all different.

2 yellowing change:

The yellowing is generally caused by certain structural films and amino groups in amino silicone oil. In the film, the cationic film is soft, feels good, easily adsorbed on the fabric, but easy to yellow discoloration, affecting the hydrophilicity, such as the cationic film into soft oil, its yellowing will be greatly reduced, there are also hydrophilic Improvements, such as compounding cationic films with hydrophilic silicone oils, or with hydrophilic finishes, have improved hydrophilicity.

Anionic film or non-ionic film is not easy to yellow, and some film does not yellow, does not affect the hydrophilicity.

Amino silicone oil is currently the most widely used silicone oil, but due to amino group will cause discoloration yellowing, the higher the ammonia value, the greater the yellowing, should be changed to low yellowing amino silicone oil or polyether modification, epoxy modification, etc. Yellow silicone oil.

In addition, cationic surfactants such as 1227, 1831, and 1631 are sometimes used as emulsifiers in emulsion polymerization. These emulsifiers also cause yellowing.

Different emulsifiers are used in the emulsification of silicone oils, and their "color stripping effect" is different, which will cause stripping and lightness under different conditions, which is already a matter of color change.

3 fabric hydrophilicity decreased:

The structure of the film is generally used and the lack of water-absorbing gene after film formation of the silicone oil, and the water-absorbing properties of the water-absorbing centers such as hydroxyl groups blocking cellulose fibers, wool carboxyl groups, amino groups, etc., are reduced, and anionic and non-ionic films should be selected as much as possible. And hydrophilic types of silicone oil.

4 dark spots:

The main reason is that the fabric of the pre-treatment is not decontaminated, the color of the oil stain is dark when dyeing, or the foam in the dyeing bath is too much, the mixture of foam and flower sweaters, dyes etc. is stained on the fabric, or the antifoaming agent floats to cause dark color. Oil spots; or tar in the dyeing tank is stained on the fabric; or the dyes agglomerate into dark stains under different conditions; or water and calcium and magnesium ions are combined with the dye and stained on the fabric. Targeted treatment, such as adding degreaser for scouring before treatment, dyeing auxiliaries using low-foaming, non-foaming auxiliaries, defoaming agents to select the species that are not easy to float, adding chelating agent to improve water quality, and adding cosolvent dispersant Anti-dye agglutination, timely clear cylinder cleaning cylinder cleaning agent.

5 light spots:

The main reason is that the pre-treatment is not uniform, some parts of the poor performance, resulting in a certain degree of repellency, or with a repulsive substance, or pre-treatment with calcium soap, magnesium soap, etc. or mercerized uneven, The semi-finished products are not evenly dried, or the cloth is stained with undissolved solid powder, soda ash or other solids, or the dyeing material is dripped with water before drying, or the dyeing material is softened, etc., and the auxiliary agent stains after finishing. The same must be targeted treatment, such as strengthening the pre-treatment, the choice of pretreatment auxiliaries must not be easy to form calcium magnesium soap, the pretreatment must be uniform and thorough (this is related to the choice of scouring agent, penetrant, chelating dispersant, mercerizing penetrant etc. ), Yuan Mingfen, soda ash, etc. must be well into the cylinder and must strengthen production management.

6 alkali spots:

The main reason is that the pre-treatment (such as bleaching, mercerizing) is not net or uneven after alkali, resulting in the generation of alkali spots, so it is necessary to strengthen the alkali treatment process of the pre-treatment process.

7 softener stains:

The causes are probably the following:

a. Films are not good material, there is a block of softeners adhere to the fabric;

b. After the film has been filled with too much foam, the fabric is covered with a softener foam when the cloth comes out of the tank.

c. The water quality is poor, the hardness is too high, and impurities in the water are combined with the softener on the fabric. Even some plants treat water with sodium hexametaphosphate or alum, which forms floc with impurities in the water and causes the fabric to stain after entering a soft treatment bath.

d. Cloth with anionic substance, in the soft processing, combined with the cationic softener stains, or cloth with alkali, so that the softener coagulation;

e. The structure of the softener is different, and some cause the softener to change from an emulsified state to a scum-like material adhered to the fabric at higher temperatures.

f. The original tar-like softeners and other substances in the tank fell onto the fabric.

8 silicone oil stains:

This is the most difficult type of stain, mainly because:

a. The PH value of the fabric is not neutral, especially with alkali, causing the silicone oil to break emulsion and float.

b. Treatment bath water quality is too bad, hardness is too high, silicone oil in the> 150PPM hardness of the water is easy to float oil;

c. The silicone oil quality problems include poor emulsification (poor choice of emulsifier, poor emulsification process, too large emulsifying particles, etc.), and impatience with shear (mainly silicone oil itself, such as silicone oil quality, emulsification system, silicone oil type, silicone oil synthesis process, etc. ).

It is possible to choose silicone oils that are resistant to shearing, electrolytes, and resistance to changes in pH. However, attention should be paid to the use of silicone oil and the environment. Hydrophilic silicone oils may also be considered.

9 bad hair:

Poor lint is closely related to the operation of the raising machine (such as tension control, raising roller rotation speed, etc.). For the raising of hair, when the softening agent (commonly called wax) is used, the dynamic and static friction coefficient of the control fabric is the key, so the raising is soft The formulation of the agent is the key. If the softener is used poorly, it will directly cause poor fuzzing, and even cause a change in the blind or the width of the door.

2. Common quality problems in resin finishing:

1 formaldehyde problem:

Decomposition of formaldehyde due to free formaldehyde or resin of N-methylol structure in the resin causes excessive formaldehyde content. Should use ultra-low formaldehyde resin or formaldehyde-free resin.

Of course, the source of formaldehyde is very wide, such as fixing agents Y, M, softeners MS-20, S-1, water repellent AEG, FTC, adhesive RF, flame retardant THPC and other additives may also cause formaldehyde Excessive standards. At the same time, the formaldehyde migration in the air may also cause excessive formaldehyde on the fabric.

2 yellowing or discoloration problems:

After the resin is finished, it will generally cause yellowing. Therefore, the PH value, acid content, and catalyst component of the resin finishing agent should be controlled to minimize yellowing and discoloration.

3 Power drop problem:

General resin finishing will produce a strong drop, you can add fiber protection agents, such as oxidized polyethylene wax emulsion.

4 feel problems:

General resin finishing will result in a hard-to-feel phenomenon, and soft components can be added, but care must be taken not to affect the quality of resin finishing. Feelings have improved and improvements have also been made to improve the drop in strength. However, problems such as the hard touch caused by the surface resin are caused by the resin itself and drying, and it is necessary to improve the properties.

3, other quality issues:

1 metal ions exceeded:

Metal ions such as Cu, Cr, Co, Ni, Zn, Hg, As, Pb, Cd, etc. are detected in the export products. If they exceed the standard, they will have serious consequences like formaldehyde exceeds the standard. In the additives, these metal ions are less. , But some auxiliaries will cause excessive, such as flame retardant antimony trioxide emulsion contains a lot of mercury, water repellent CR, PhoboTexCR (ciba), Cerolc (Shandez) and other chromium. When a medium dye is used for wool spinning, the dyeing agent used is potassium dichromate or sodium dichromate or sodium chromate, and Cr6+ will exceed the standard.

2 color change problem:

After the finishing, the problem of color change is more, this must pay attention to the choice of dye in dyeing, in the dyeing and proofing, must be processed according to the corresponding finishing, determine whether the dye will be used in the finishing Under the effect of color change, of course, the best choice is not caused by post-staining agent is the most ideal solution, but this often has limitations (such as copper-containing antibacterial agent itself is colored, chromium-containing water repellent also has color , It will cause the fabric's color change), but also take into account the dyeing fabric in the drying and baking dye sublimation caused by the color and color change and high temperature caused by yellowing and other factors.

3APEO exceeded:

APEO as an indicator is also strictly limited by some countries. This indicator is related to the scouring agent and penetrant in the pretreatment, the detergent and leveling agent in the printing and dyeing, and the emulsifier in the softener after finishing. In the current situation where TX, NP series surfactants are widely used as auxiliary materials, it is difficult to prevent them. The only way is for printing and dyeing plants to adhere to the use of environmental protection auxiliaries and strictly eliminate the additives containing APEO and toxic and harmful substances. use.

Knitted Fabric

Knitted Fabric,Ribbed Knitted Fabric,Rib Knitted Fabric,Polyester Knit Fabric

Shaoxing Longwell Tetxtiles Co.,Ltd. , https://www.longwellfabric.com