Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – Including means to prepare parison
Patent
1995-09-18
1997-12-23
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
Including means to prepare parison
264523, 264526, 425 73, 425541, B29C 4904
Patent
active
057004986
ABSTRACT:
Apparatus for blow-molding an article curved in three dimensions comprises two horizontally movable mold parts which, when in contact with each other, define a mold cavity curved in three dimensions to match the required article. An extrusion head extrudes a parison of synthetic resin material into the cavity so that it descends towards the lower end thereof. During this process, a first air flow is fed through apertures in a cover and passes through the mold cavity around the outside of the parison to ease the passage of the parison towards the lower end. In addition, a second air flow is fed through a nozzle in the extrusion head into the interior of the parison so as to help it descend and also to prevent its distortion as it moves into the mold cavity. Thereafter, closure members, which are slidable on, but movable independently of, the main mold parts, close off the upper and lower ends of the mold cavity and pinch the parison between them, their movements being controlled by respective actuators. Blow-molding then takes place in order to produce the required article. The mold parts are then separated. The article remains suspended by the closure members and can be grabbed by a manipulator arm or a robot arm and then removed after separation of the closure members.
REFERENCES:
patent: 3662048 (1972-05-01), Turner
patent: 4034036 (1977-07-01), Farrel
patent: 4192843 (1980-03-01), Trieschock et al.
patent: 4865799 (1989-09-01), Sadr
Drusche, "Seamless Solutions," European Plastics News, 21, 21-22 (1994).
Renzo Bernard
Robinault Michel
Urbain Didier
Draftex Industries Limited
Schwartz Iurie A.
Woo Jay H.
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