To manufacture a plastic bottle container made thin-walled uniformly as a whole by uniformly and sufficiently stretching a preform as a whole by preventing the whitening caused by over-stretching or local stretching at the time of stretch blowing of the preform.
In a stretch blow molding method for forming the plastic bottle container by heating the bottomed cylindrical preform to a predetermined temperature to subject the same to stretch blow molding, blow air is supplied under heating and pressure to hold the preform to a softened state suitable for stretching at a region where the over-stretching or local stretching of the preform in a stretching process is easy to occur and the preform is reasonably stretched to prevent the whitening caused by over-stretching or local stretching to be stretched uniformly and sufficiently as a whole.
COPYRIGHT: (C)2006,JPO&NCIPI
Maeda Koji
Hidehiko Katsuta
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| JP4366604A | ||||
| JP3011058B2 | ||||
| JP2000334816A | ||||
| JP2002240136A |