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Structure and properties of biaxially stretched poly(ethylene terephthalate) sheets
Author(s) -
Maruhashi Yoshitsugu,
Asada Tadahiro
Publication year - 1996
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10434
Subject(s) - materials science , poly ethylene , ethylene , composite material , polyethylene terephthalate , polymer chemistry , organic chemistry , catalysis , chemistry
Huge numbers of PET (poly[ethylene terephthalate]) bottles are produced in the world. Especially in Japan, the number of hot‐fillable PET bottles used is extremely large and is still increasing. This type of bottle is generally manufactured by the heat‐set method using hot molds after stretch‐blow molding. Herein, we examined how the PET sheet stretching condition affects the PET heat‐shrinkage behavior at 85°C, which is the hot‐filling temperature. Sheets stretched at a higher temperature and higher speed had higher thermal stability for a wider range of draw ratios. This is because those sheets have a higher crystallinity and relaxed amorphous regions. The higher stretch speed gives the sheet a higher crystallinity with self heat generation during rapid deformation. A higher stretch temperature makes the molecular segments relaxed.