Preventing gas leakage around blow needle in blow molding method

Details Preventing gas leakage around blow needle in blow molding method Preventing gas leakage around blow needle in blow molding method

1988-09-30

1989-08-22

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

425536, B29C 4918, B29C 4960

Patent

active

048593974

ABSTRACT:
Blow molding of a parison with a blow needle is aided by the use of a sealing member which includes at least one projection which completely surrounds the blow needle. During inflation of the parison, the projections come into sealing contact with the exterior surface thereof so as to effectively prevent leakage of blow gas from the interior of the parison around the blow needle.

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