Decomposition of formaldehyde due to free formaldehyde or resin of N-methylol structure in the resin causes excessive formaldehyde content. Should adopt ultra-low formaldehyde resin or formaldehyde-free resin. Although the source of formaldehyde problems is very wide, such as fixatives 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 cause yellowing. Therefore, it is necessary to control the PH value, acid content, and catalyst component of the resin finishing agent to minimize yellowing and discoloration. 3 strong landing problems: All resin finishing will produce strong drop, and fiber protection agents such as oxidized polyethylene wax emulsion can be added. 4 feel problems: 1 General resin finishing will cause a hard-to-feel phenomenon, and soft components can be added, but care must be taken not to affect the resin finishing quality. Feel is improved, and improvement of strong landing is also greatly improved. However, problems such as the hard texture of the surface resin are caused by the resin itself and drying, etc., and it is necessary to improve the specificity. 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 also have serious consequences like formaldehyde exceeding the standard. In the additives, these metal ions are relatively Less, but some auxiliaries will cause excessive standards, such as flame retardant zirconia 2 oxime emulsion containing 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, we must follow the process to carry out the corresponding finishing, determine whether the dye is used in the finishing The color change occurs under the influence of the agent. Of course, it is best to choose a finishing agent that will not cause discoloration. This is often the most ideal solution. However, this often has limitations (for example, the copper-containing antibacterial agent itself is colored, and the chromium-containing water repellent agent also has Color picking will cause the fabric color change. At the same time, it should also take into account the dyeing fabric dyeing sublimation color and color change caused by the dye and the temperature is too high caused by the yellowing and other factors. 3APEO exceeded: APEO is also strictly limited by some countries as an indicator. This indicator is consistent with the scouring agent and penetrant used in pretreatment, the detergent and leveling agent used in printing and dyeing, and the emulsifier used in softener after finishing. In the current situation where TX and 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 to strictly eliminate additives containing APEO and toxic and harmful substances. Used in factory. Plastic Machinery,Co-Extruded Cast Film Production Line,Automatic Laminator Laminating Machine,Cast Stretch Film Machine Changzhou Xinzhongshun Nonwoven Machinery Co., Ltd. , https://www.xzsnonwovenmachine.com
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