Plastic article or earthenware shaping or treating: apparatus – Stock pressurizing means operably associated with downstream... – Including auxiliary shaping means associated with molding...
Patent
1978-08-02
1980-05-06
Thurlow, Jeffery R.
Plastic article or earthenware shaping or treating: apparatus
Stock pressurizing means operably associated with downstream...
Including auxiliary shaping means associated with molding...
4253261, 425467, B29D 2304
Patent
active
042015324
ABSTRACT:
In an extrusion die of the spiral mandrel type the cross holes and their respective helical channels or grooves are arranged in sets, each set including at least two cross-holes disposed one above the other in the direction of the mandrel longitudinal axis. Preferably each set includes three or four cross holes disposed one above the other. This structure permits the provision of a large number of cross holes while leaving large spaces between the sets through which other passages, such as for bubble internal cooling system pipes, can be passed. All of the channels or grooves are relieved into the melt flow passage in the die at the same plane perpendicular to the mandrel axis. Unexpectedly the structure permits desired uniformity of annular flow from the die orifice to be obtained.
REFERENCES:
patent: 3418687 (1968-12-01), Albert
patent: 3452125 (1969-06-01), Schurman et al.
patent: 3689192 (1972-09-01), Upmeier
patent: 3809515 (1974-05-01), Farrell
patent: 3966861 (1976-06-01), Papesh et al.
Flow Analysis In Extrusion Dies-SPE Journal-Feb., 1972-vol. 28, pp. 34-41.
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