PET pack of production process:
First is the extruder temperature control is in commonly 250 ℃ ~ 280 ℃. Next up is cooling, take out after high temperature for helicopter, immediately into the water cooling, because equivalence rules in urgent cold polypropylene under the condition of the crystal structure, easy to generate Yun Yun molecular structure than loose crystal. Easy to stretch orientation, get high quality products. Then, the purpose of drawing tensile is to improve the longitudinal strength of the pack, reduce the elongation. Drawing must be in boiling water, generally USES a stretch. Finally, after the stretch is embossed pack after two of the pressure roller with decorative pattern, are pressure patterns on, the role is in use increase friction, no sliding, in appearance beautiful and easy.
PET pack to bring the fracture parameters and elongation: tension
1, 12 mm wide and 0.6 mm thick specifications of pure PP packing material with the fracture tension > 1000 N elongation: < 20%
2 and 13.5 mm wide and 0.6 mm to 0.8 mm thick specifications of pure PP packing material with the fracture tension: 1000 N-1500 N elongation: < 20%
3 and 15.5 mm wide and 0.6 mm to 0.8 mm thick rules and pure PP packing material with the fracture tension: 1500 N-2000 N elongation: < 20%
4, 19 mm wide 0.6 mm to 0.8 mm thick rules and pure PP packing material with the fracture tension: 2000 N
