Method of producing bottles of saturated polyester resin

Details Method of producing bottles of saturated polyester resin Method of producing bottles of saturated polyester resin

B - Operations, Transporting

29

D

18/515

B29D 23/03 (1980.01)

Patent

CA 1147114

ABSTRACT OF THE DISCLOSURE A method of producing a saturated polyester resin bottle having a white-patterned wall by bringing at least one heat absorbing member into partial contact with a transparent tubular parison of a saturated polyester resin, when the tubular parison is heated, so that the portions of the saturated parison other than that contacting with the heat absorbing member may be heated to a relatively high temperature and may be locally crystallized to leave a desired white pattern. The heat absorbing member is inserted into the tubular parison [the heat absorbing member attached to a stem] there- by to prevent the portion of the tubular parison in contact with the heat absorbing member from turning locally white. The relatively high temperature is higher than the glass transition temperature and lower than the crystallization temperature of the saturated polyester resin used. The heating treatment is interrupted while the parison portion in contact with the heat absorbing member is left in its uncrystallized transparent condition.

335054

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