Textile Finishing Resin Finishing

The so-called resin finishing is the use of resin to change the physical and chemical properties of fabrics and fibers, improve the fabric shrink-proof, wrinkle-free finishing performance. The finishing of cotton fiber fabric resin is based on general shrink-proof and crease-free finishing. It has undergone development stages such as ironing-free (washable and wearable) and durable press-iron finishing (referred to as PP or DP finishing), except for cotton and viscose fiber fabrics. In addition, it is also used in the finishing of polyester/cotton, polyester/viscose and other blended fabrics.

Wrinkles are caused by the fabric, so that due to the external force, the fibers are bent and deformed, and the fibers are not fully recovered after removal of the fabric. In the case of cellulosic macromolecules, there are many polar hydroxyl groups on the macromolecular chain. When the fiber macromolecules undergo relative displacement by cleavage, new hydrogen bonds are formed at the new position; when the external force is removed, due to newly formed The hindrance of hydrogen bonds prevents the cellulose macromolecule from immediately returning to its original state, which often lags behind. If external forces act, the breaking of the hydrogen bonds between cellulose macromolecules and the formation of new hydrogen bonds have reached a sufficient level, so that the new hydrogen bonds have considerable stability, and permanent deformation occurs, which is also the cause of wrinkles. the reason. The resin finishing agent can combine with the hydroxyl group in the cellulose molecule to form a covalent bond, or be deposited between the fiber molecules, and establish hydrogen bonds with the cellulose macromolecules, limiting the relative sliding between the macromolecular chains, thereby increasing the fabric's Shrinkproof, wrinkle-free performance.

There are many kinds of resin finishes, but they are still mostly used as N-methylolamides. Such as dimethylol urea (urea formaldehyde resin, referred to as UF), melamine formaldehyde resin (cyanide resin, referred to as TMM), dimethylol ethylene urea resin (DMEU), dimethylol dihydroxyethylene urea (DMDHEU) Or 2D). However, the amount of formaldehyde remaining on the treated fabrics exceeds the standard and is unfavorable to people's health. Therefore, a new type of resin finishing agent is used instead.

According to the degree of moisture content of cellulose fibers, the resin finishing process can be divided into a dry cross-linking process, a tidal cross-linking process, and a wet cross-linking process. At present, the resin finishing process mostly adopts dry cross-linking and has different functions. This process is easy to control, has good reproducibility, and is continuous and rapid, but the fabric breakage strength, tear strength and wear resistance decrease more.

The process of resin finishing (dry cross-linking) is:

The padding resin finishing solution → pre-bake → hot air tenter drying → curing → soaping → post-treatment (such as soft, calendering, tentering, drying).


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