Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1997-11-05
1999-11-02
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...
425338, 4254501, 425532, 425534, 425541, B29C 4904, B29C 4956
Patent
active
059764520
ABSTRACT:
A method and apparatus wherein an extruder provides extruded plastic parisons to a first and second horizontally movable blow mold assemblies, and each blow mold assembly includes two sets of blow molds, and each set includes a pair of blow mold halves. The blow mold halves are closed about the tubular parisons and moved to one of two blow molding stations where a blow pin at the blow molding station blows the parison to form a hollow blow molded article. More specifically, four platens are provided in each blow mold assembly. A first pair of outer and inner platens supports the first pair of blow mold halves and a second pair of outer and inner platens supports the second pair of blow mold halves. A pair of tie rods passes through all four platens. The first outer platen is attached to the ends of the tie rods. The second outer platen is moved by a mechanism such as a cylinder or toggle mechanism for movement on the tie rods. The first inner platen is connected to the second outer platen by a second set of tie rods. The second inner platen is connected to the first outer platen by a third set of tie rods. When the first assembly of open blow mold sets is brought into position adjacent the extruder station, parisons are extruded between both sets of mold halves. The first assembly of mold sets are closed about the parisons and then moved to one of the blow stations. As the first assembly of mold sets moves away from the extruder means, the second assembly of mold sets at the other blow station is opened, releasing the containers which have been blown at the other station and the second assembly of open blow mold halves are moved to the extruder station for a continuation of the cycle.
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Lee Dae Young
Owens-Brockway Plastic Products Inc.
Silbaugh Jan H.
LandOfFree
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