Molding die for ribbed pipe

Details Molding die for ribbed pipe Molding die for ribbed pipe

2005-04-12

2005-04-12

Del Sole, Joseph S. (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Diverse distinct type shaping means

Shaping orifice and either a downstream preform reshaping...

C425S326100, C425S380000, C425S393000, C425S396000, C425S369000

Reexamination Certificate

active

06877976

ABSTRACT:
A ribbed pipe molding apparatus has a die with a plastic flow passage which carries molten plastic from an extruder to a mold for making the ribbed pipe. The plastic flow passage has a downstream flow region which exits at an acute angle through the external surface of the die. The inner wall of the end region which locates downstream of the outer wall of the flow passage in the downstream flow region of the passage has a transition wall part which is also inclined relative to the exterior surface of the die but which is sloped at a angle less than the main part of the downstream flow region of the passage. The transition wall part of the inner wall shapes the mouth of the passage so as to produce a wedging of the plastic flowing through the passage into the mold for extremely efficient production of the ribs on the pipe.

REFERENCES:
patent: 4365948 (1982-12-01), Chaplain
patent: 4510013 (1985-04-01), Lupke et al.
patent: 4721594 (1988-01-01), Jaervenkylae
patent: 4900503 (1990-02-01), Hegler
patent: 4936768 (1990-06-01), Lupke
patent: 4983347 (1991-01-01), Rahn
patent: 6210617 (2001-04-01), Holso et al.

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