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China plastic bag manufacturers.Custom printed plastic vest bags, punching bags,opp bags,carrier tote bags,ziplock bags,food bags,garbage bags,wholesale suppliers in china. or striped (10), polyvinyl chloride fiber: a cross-sectional shape: nearly circular; vertical surface morphology: smooth surface (11), spandex fibers: cross-sectional shape: irregular shapes, round, potato-shaped; vertical surface morphology: surface dark deep, was not clear bone-shaped stripes (12), polyester, nylon, polypropylene fibers: cross-sectional shape: round or shaped; vertical surface morphology: Smooth (13), polyvinyl alcohol fibers: cross-sectional shape: round the waist, skin-core structure. ; vertical surface morphology: 1 to 2 .3 groove density gradient method: It is based on a variety of fibers with different density characteristics to identify non-woven fibers, density gradient method: (1) with a given density gradient solution. xylene is generally used carbon tetrachloride system. (2), calibration density gradient tube, commonly used precision ball method. (3), measured and calculated, will be tested fiber de-oiling, drying, degassing pretreatment , made a
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