Plastic article or earthenware shaping or treating: apparatus – Diverse distinct type shaping means – Shaping orifice and either a downstream preform reshaping...
Reexamination Certificate
2005-06-14
2005-06-14
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...
C425S369000, C425S336000, C425S380000, C264S508000
Reexamination Certificate
active
06905325
ABSTRACT:
Pipe molding apparatus having a molding mold tunnel includes an upstream (3) and at least one downstream mold block (7). Each mold block (3, 5, 7) comprises mold block sections which close with one another to form the pipe and which open relative to one another to release the pipe. The mold blocks (3, 5, 7) move downstream of the apparatus together with one another when forming the pipe and move upstream separately from one another when releasing the pipe which cools and shrinks in both diameter and length in the mold tunnel. Each mold block (3, 5, 7) has a hollow pipe forming region with the pipe forming region of the downstream mold block being decreased in both diameter and length relative to the pipe forming region of the upstream mold block (3) to compensate for the plastic shrinkage.
REFERENCES:
patent: 5017321 (1991-05-01), Comfort
patent: 5510071 (1996-04-01), Van Wonderen et al.
patent: 5744091 (1998-04-01), Lupke
patent: 200 11 666 (2000-10-01), None
Lupke Manfred A. A.
Lupke Stefan A.
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