Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Extrusion shaping means
Reexamination Certificate
2000-03-02
2002-02-12
Nguyen, Nam (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Extrusion shaping means
C425S133100, C425S380000, C425S462000, C425S467000
Reexamination Certificate
active
06345972
ABSTRACT:
BACKGROUND OF THE INVENTION
It is the purpose of this invention to provide a unique distribution groove for a balanced flow passage used to disperse the molten plastic in an extrusion die evenly within an annular extrusion channel. Die systems, employing balanced flow distribution grooves, are constructed by assembling a series of cylindrical components along a common axis. A continuous flow passage is formed by the cooperation of the adjacent components. The passage may comprise an inlet, a pair of flow channels, a distribution groove, a conical extrusion channel, and an outlet which sequentially communicate to form a continuous passage. It is the purpose of this invention to provide components which have multiple applications and to facilitate the replacement of certain parts of the passage to provide different functions.
SUMMARY OF THE INVENTION
In the extrusion die of this invention, the die body is constructed with an inlet which communicates with a pair of flow channels. The flow channels supply molten plastic to a pair of distribution grooves constructed in the upstream face of the die component adjacent to the die body. The die body can be used for a variety of applications by replacing the die component with alternate designs. In addition the distribution groove of this invention maybe formed by a pair of opposing semi-volute shaped grooves which are spirally nested or enlarged by combination with grooves on the mating faces of the components.
REFERENCES:
patent: 3327349 (1967-06-01), Lennox
patent: 3334382 (1967-08-01), Lefevre
patent: 4120633 (1978-10-01), Feuerherm
patent: 5667818 (1997-09-01), Guillemette
patent: 5882694 (1999-03-01), Guillemette
patent: 5980226 (1999-11-01), Guillemette
patent: 6077062 (2000-06-01), Guillemette et al.
Guill Tool And Engineering Co., Inc.
Leyson Joseph
Nguyen Nam
Perman & Green LLP
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