Stretch blow molding method for manufacturing an expanded bottle
AssigneeDai Nippon Insatsu K. K.
InventorsTsutoo Yamada, Takemi Shibuya
Life of this patent
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Abstract
A stretched bottle (1) has an inclined mouth portion (31). The bottle (1) is formed in a manner that a straight parison is set in a blow mold (M.sub.1, M.sub.2) having an inclined cavity (20, 404) to be stretched by a stretching rod (17) during an air-blow operation or that a curved parison (405, 512) is set in the blow mold (M.sub.1, M.sub.2) to be stretched by air-blow. The parison is curved or deformed by a defining mold (431, 711) or a pushing bar (514).
Claims12
A stretch blow molding method for manufacturing an expanded bottle in which a parison is set in a blow mold to be expanded by air-blowing, comprising the steps of:
- a) preparing a straight cylindrical parison made of resin;
- b) stretching the straight cylindrical parison in its longitudinal direction so as to have a predetermined length;
- c) curving the stretched parison by bringing the stretched parison into contact with a curved and heated surface which is formed in a deforming mold having an open space through which the stretched parison is inserted into the deforming mold while the stretched parison contact the curved and heated surface and through which the curved parison is removed from the deforming mold;
- d) setting the curved parison in a cavity inclinedly formed in the blow mold;
- and
- e) blowing air into the curved parison thereby forming the bottle.
A stretch blow molding method for manufacturing an expanded bottle in which a parison is set in a blow mold to be expanded by air-blowing, comprising the steps of:
- a) preparing a straight cylindrical parison made of resin;
- b) stretching the straight cylindrical parison in its longitudinal direction so as to have a predetermined length;
- c) curving the stretched parison by bringing the stretched parison into contact with a curved and heated surface which is formed in a deforming mold, the deforming mold comprising a main body having the curved and heated surface formed therein and a supplementary body which is opened and closed with respect to the main body, a curved space being formed for accommodating the parison when the supplementary and main bodies are closed, the supplementary body being automatically opened and closed when the supplementary body is moved respectively away from and close to a holder for holding the stretched parison, the stretched parison slidingly contacting the curved and heated surface when the holder and the deforming mold are moved close to each other;
- d) setting the curved parison in a cavity inclinedly formed in the blow mold;
- and
- e) blowing air into the curved parison thereby forming the bottle.
Dependencies are inferred from the claim text.