4.1.3 polymer fibers.
Polymer fibers can be classified by material chemical composition and fiber shape:
a) By material chemical composition:
1) Aromatic polyamide fiber, according to the molecular structure, is divided into polyterephthalyl p-phenylenediamine fiber (material ** is pp-
TA) and polyisophthalephthalein m-phenylenediamine fibers (material ** PMIA), etc. When the specific chemical composition of the material is not specified.
material ** is ar;
2) Polypropylene fiber, material ** is PP;
3) Polyacrylonitrile fiber, material ** is pan:
4) Polyester fiber, according to the molecular structure, is divided into polyethylene terephthalate fiber (material **PET) and polyethylene terephthalate.
Propylene formate (material ** is PTT) and polybutylene terephthalate (material ** is PBT). When it is not specified.
The chemical composition of the material** is PES.
b) By fiber shape:
1) Monofilament fiber, shape ** DS;
2) Membrane fissures reticular fibers with a shape of ml.
5.3 polymer fibers.
5.3.1. Polymer fibers should be visually inspected and inspected in natural light, and the color should be single.
1. No color difference; Soft to the touch; No pollution, no impurities.
Quality. Aromatic polyamide fibers, polypropylene monofilament fibers and polyester fibers should be bundled filaments with uniform cuts; The polyacrylonitrile fiber should be a bundle of filaments, and the incision should be a cashew-shaped cross-section; Polypropylene mesh fibers should be evenly and regularly opened, with at least one connection point per 10mm length, and be a mesh structure.
5.3.2. The technical requirements and test methods of aromatic polyamide fibers shall be in accordance with the provisions of Table 5.