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Patent Searching and Data


Title:
FORMING METHOD OF PARISON FOR ORIENTATION BLOW MOLDING
Document Type and Number:
Japanese Patent JPS61108509
Kind Code:
A
Abstract:

PURPOSE: To enable to mold a thick-walled parison in normal molding cycle by a method wherein the injection-molded parison is axially compressed in a temperature-controlled mold during temperature control process in order to shorten the neck length of the parison and at the same time to form the wall thickness of the parison more thicker.

CONSTITUTION: A mold clamping is done by inserting a core 4 into an injection mold 1 from the above of a neck mold 3, which is attached onto the lower side surface of a transfer plate 2 and fitted to the injection mold 1 in order to injection-mold a bottomed parison 5. The parison is removed from the mold 1 at a temperature as high as possible and transferred to the upper part of a temperature-controlled mold 6 while being pinched at the neck part 5a of the parison 5. The parison 5 is inserted in a cavity 7 so as to close the mold with the neck mold 3 and the mold 6. During the process of the above-mentioned mold closing, because he difference exists between the length of the neck 5b and the depth of the cavity 7, the neck 5b is axially compressed and shortened before closing the mold and at the same time the wall thickness is increased so as to realize the shortened parison 9. Due to the change of wall thickness under compression and the heat given from the outside of the parison, the temperature distribution in the neck 5b becomes uniform quicker than that in the case, when only the heat from the outside is given. In addition, the strain developed during injection molding is also removed.


Inventors:
NAKAMURA YOSHINORI
Application Number:
JP1984000229724
Publication Date:
May 27, 1986
Filing Date:
October 31, 1984
Export Citation:
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Assignee:
NISSEI ASB MACHINE CO LTD
International Classes:
B29B11/08; B29B11/12; B29C49/64; B29C43/00; B29C49/06; B29L22/00; (IPC1-7): B29B11/08; B29B11/12; B29C49/64