Shanghai Daoqin Plastics Co., Ltd.

        1 wire drawing, 烧 时候 in machine upper lower filament, filament long long, rear filament 拉断, in 间 断点, filament is is formed small 圈状, 卷 越 more melting point high. generally if is bottle sheet/slice, 应该都不会 has what large issues.  
    2先闻味道, PET plastics different generally plastics , use machine lower, pure PET plastics 会 dispersion non 常芳香 味道, if PET plastics has other formed separation, 味道就 very 刺鼻. has types bottle 子里面含 has SEBS formed separation can use.
    3看烧起 部 separation, if separation or 者油滴 very fast, more melting point positive 常, this in PET plastics film sheet/slice in has.  
    4 most key/critical is separation its in is has PET plastics, this can is PET 致命伤. more 取样, rear in cationic light 充足 方, PVC in cationic light lower 呈淡蓝 color. if for in has white 折痕. above is identification, property has 限, main/primary experience.