Title:
MOLDING METHOD AND DEVICE FOR HOLLOW CONTAINER
Document Type and Number:
Japanese Patent JP2760369
Kind Code:
B2
Abstract:
PURPOSE: To expand a parison and cool a molded product efficiently and mold a container of large capacity by sticking a hollow needle of small diameter into the parison, blowing a fluid, sticking a hollow needle of large diameter in the state of applying internal pressure and blowing the fluid of a large flow volume.
CONSTITUTION: A cavity of a molding tool comprises a cavity 4 forming a hollow container and a cavity 5 forming a flash section. A hollow needle 6 of small diameter is set on a section of the cavity 5 corresponding to the flash section and a hollow needle 7 of large diameter below the hollow needle of small diameter. The hollow needle 6 of small diameter known to the public can be used, and the passage sectional area of the hollow needle 7 of large diameter is preferably 3-15 times as large as the hollow needle 6 of small diameter. It is preferable that the hollow needle 6 of small diameter is stuck into a parison first and then the hollow needle 7 of large diameter is stuck in after 0.5-2 seconds. In the case the timing is shorter than the above-said range, the internal pressure of the parison is not sufficient for sticking the hollow needle 7 of large diameter, while there is no advantage nor merit in setting the timing longer than the range.
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Inventors:
MATSUHASHI SETSU
Application Number:
JP6858093A
Publication Date:
May 28, 1998
Filing Date:
March 26, 1993
Export Citation:
Assignee:
TOYO SEIKAN KK
International Classes:
B29C49/04; B29C49/58; B29C49/60; B29C49/66; B29D22/00; B29C49/02; B29L22/00; (IPC1-7): B29C49/58; B29C49/02; B29C49/04
Domestic Patent References:
| JP357622A | ||||
| JP5104615A | ||||
| JP593260B1 |
Attorney, Agent or Firm:
Suzuki Ikuo