Method for blow molding articles with deeply recessed edges

Details Method for blow molding articles with deeply recessed edges Method for blow molding articles with deeply recessed edges

1985-08-26

1986-10-14

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

425532, 425541, B29C 4904, B29C 4956

Patent

active

046171665

ABSTRACT:
A method and apparatus for blow molding articles with deeply recessed edges utilizing mold halves each of which consists of a center section and end sections that are relatively movable in a direction lengthwise of the mold to enable both lengthening and shortening of the mold. Rack and pinion assemblies are associated with the mold sections so that in response to movement of one end section toward or away from the center section, the other end section is similarly moved toward or away from the center section to thereby enable selective lengthwise lengthening or shortening of the mold halves. This enables the mold halves to be shortened after they are closed on a parison to thereby compress the shape of the parison within the mold to thereby move portions of the parison closer to the edges of the mold cavity. This facilitates a uniform distribution of plastic material along the surface of the mold cavity when the parison is blown into conformity with the mold cavity.

REFERENCES:
patent: 3672799 (1972-06-01), Liebertz et al.
patent: 3860683 (1975-01-01), Ward
patent: 4265102 (1981-05-01), Shimakata et al.
patent: 4333905 (1982-06-01), Hestehave et al.

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