The tentering is based on the fact that the cotton fiber has a certain plasticity in a wet state, adjusts the state of the warp and weft yarns in the fabric under slow drying, and stretches the fabric width to a predetermined size to achieve a uniform and stable shape.
Cotton fabrics are usually tentered by cloth clip tenter machines, and wool, silk and chemical fiber fabrics are often used by needle clip tenter machines.
The front end of the tenter is often equipped with a padding machine and a drum drying device, so tenter finishing is often combined with certain additive finishing (such as softness, whitening, etc.).
2. Jacking finishing
And embossing finishing calendering, electro-optical finishing can increase the gloss of the fabric, the embossing finishing makes the surface of the fabric rolled with a three-dimensional impression of uneven patterns.
These finishings are made by using the plasticity of the cotton fiber in the hot and humid state through different degrees of roller rolling.
3. Hard finishing
Stiffening finishing, commonly known as sizing finishing, is to use a slurry made of high-molecular substances (wet starch or chemical slurry) to pad on the fabric to form a film, so that the fabric can obtain smooth, stiff, thick and full of various feels. And improve the strength and wear resistance of the fabric, extend the service life.
In addition to cotton fabrics can be processed by calendering, mechanical pre-shrinking and other processing to obtain a softer feel, but also by adding a softener method for soft finishing.
Soft finishing usually adopts the method of padding finishing liquid and then heat treatment, which is mostly combined with hot air tenter finishing.
Fluorescent whitening agent (fluorescent Whitening Agent) can absorb the invisible ultraviolet light in the sunlight into bright blue-violet visible light radiation, mixed with the original yellow light on the fabric into white light, thereby greatly improving the whiteness of the fabric. Fluorescent brighteners have an affinity for fibers and can be dyed like dyes. Therefore, whitening can be done by hot air stentering after dipping or padding.
6. Anti-shrinkage and anti-crease finishing
When the fabric dried after dyeing and finishing is wetted again in a relaxed state, a significant shrinkage in the warp and weft directions will occur. This phenomenon is called shrinkage. Dyeing and finishing processes often use mechanical pre-shrinking and chemical finishing methods to solve the problem of excessive shrinkage of fabrics.