Method and device for heating preform

Details Method and device for heating preform Method and device for heating preform

2005-06-14

2005-06-14

Campbell, Thor S. (Department: 3742)

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

C425S500000, C264S005000

Reexamination Certificate

active

06906290

ABSTRACT:
While blowing out cooling air to a preform which is biaxially stretched and blow molded into a bottle shape, heat sources are made operative by a high power and the first heating process as quick heating is performed to the preform. Subsequently, the heated preform is left as it is and a temperature adjusting process to reduce a temperature difference between an outer surface temperature and an inner surface temperature of the preform to a predetermined value or less is executed. The second heating process to heat the preform until the outer surface temperature is equal to a temperature which is slightly lower than a crystallization temperature of the PET is executed to the preform obtained after completion of the temperature adjusting process while blowing out the cooling air to the preform. Thus, the quick heating of the preform is safely accomplished without causing an overheating state.

REFERENCES:
patent: 4076071 (1978-02-01), Rosenkranz et al.
patent: 5326258 (1994-07-01), Gittner et al.
patent: 23 52 926 (1975-04-01), None
patent: 74 32906 (1974-10-01), None
patent: A 6-63940 (1994-03-01), None
patent: A 8-142175 (1996-06-01), None
patent: A 11-42702 (1999-02-01), None

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