3 secrets about fabric testing

1, hand visual inspection method: This method is applicable to textile raw materials in the state of loose fibers.

 

(1), cotton fiber than ramie fiber and other hemp process fiber, wool fiber are short and fine, often with a variety of impurities and blemishes.

 

(2), hemp fibers feel coarse and hard.

 

(3), wool fiber curly and elastic.

 

(4), silk is a long silk, long and thin, with a special luster.

 

(5), chemical fibers only viscose fibers in the dry and wet state strength differences.

 

(6), spandex silk has a very large elasticity, at room temperature it can be stretched to more than five times the length.

2、Microscopic observation method.

 

(1), cotton fibers: cross-sectional morphology: waist round, with a mid-waist; longitudinal morphology: flattened band, with a natural turning curve.

 

(2), hemp fiber: cross-sectional morphology: rounded or polygonal waist, with a cavity; longitudinal morphology: with transverse knots, vertical lines.

 

(3), wool fiber: cross-sectional morphology: round or nearly round, some have pith; longitudinal morphology: the surface has scales.

 

(4), rabbit hair fiber: cross-sectional morphology: dumbbell-shaped, with hair pith; longitudinal morphology: surface with scales.

 

(5), mulberry silk fiber: cross-sectional morphology: irregular triangle; longitudinal morphology: smooth and straight, longitudinal stripes.

 

(6), ordinary viscose fiber: cross-sectional morphology: serrated, skin core structure; longitudinal morphology: longitudinal grooves.

 

(8), acrylate fiber: cross-sectional form: trilobal or irregular serrated; longitudinal form;

 

3、Burning method.

 

(1), cotton, linen, viscose fiber, copper ammonia fiber: near the flame: not shrink or melt; contact flame: rapid combustion; leave the flame: continue to burn; smell: the smell of burning paper; residue characteristics: a small amount of gray-black or gray-white ashes.

 

(2), silk, wool fiber: near the flame: curled and molten; contact flame: curled, melted, burning; leave the flame: slow burning sometimes self-extinguishing; odor: the smell of burning hair; residue characteristics: loose and brittle black particles or coke.

 

(3), polyester fiber: near the flame: melt shrinkage; contact flame: melt, smoke, slow burning; leave the flame: continue to burn, sometimes self-extinguishing; odor: special aromatic sweet smell; residue characteristics: hard black beads.

 

(4), nylon fiber: near the flame: melt shrinkage; contact flame: melt, smoke; leave the flame: self-extinguishing; odor: amino taste; residue characteristics: hard light brown transparent beads.

 

(5), acrylic fiber: near the flame: melt shrinkage; contact flame: melt, smoke; leave the flame: continue to burn, black smoke; odor: spicy taste; residue characteristics: black irregular small beads, fragile.

 

(6), polypropylene fiber: near the flame: melt shrinkage; contact flame: melt, burning; leave the flame: continue to burn; smell: paraffin smell; residue characteristics: gray-white hard transparent beads.

 

(7), spandex fiber: near the flame: melt shrinkage; contact flame: melt, burning; leave the flame: self-extinguishing; odor: special smell; residue characteristics: white gelatinous.

 

(8), chlorine spandex fiber: close to the flame: melt shrinkage; contact flame: melt, burning, black smoke; leave the flame: self-extinguishing; odor: pungent odor; residue characteristics: dark brown hard.

 

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