Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – For extrusion or injection type shaping means
Patent
1975-08-14
1978-04-11
Husar, Francis S.
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
For extrusion or injection type shaping means
264DIG81, 425382N, 425464, 425465, B29F 304
Patent
active
040836673
ABSTRACT:
Apparatus for extruding tubular plastic netting including concentric, counterrotatable inner and outer dies mounted in a housing with a space therein for the downward flow of molten plastic to a circular series of holes in each of the dies leading to their respective extrusion orifices, the apparatus having means for splitting the downward flow of plastic into two separate streams, one for the extrusion orifices of the inner die and the other for the extrusion orifices of the outer die, this means being formed substantially to equalize the rate of flow of the plastic to the extrusion orifices. The apparatus is also shown as including a seal arrangement in which a first and a second set of wedge seals protect bearings journalling one of the dies in the housing from the plastic, with the provision of a vent between the sets of seals so as to prevent application of pressure to the second set of seals in the vent the first set leaks. Also shown is a circular mandrel below the dies located below the surface of water in a water bath, the tubular netting surrounding the mandrel as the netting exits downwardly from the dies into the water bath. The mandrel is supported by means of a pipe which directs a flow of cooling water into the inner surfaces of the tubular netting so as to maintain the water level on the inside and outside of the tubular netting substantially the same. Also shown is means for momentarily increasing the amount of plastic extruded in timed relation to the formation of intersections of the netting filaments thereby to apply an increased amount of plastic to the filaments at the intersections so as to reinforce the latter.
REFERENCES:
patent: 2919467 (1960-01-01), Mercer
patent: 3051989 (1962-09-01), Mercer
patent: 3228063 (1966-01-01), Gutierrez
patent: 3422648 (1969-01-01), Lemelson
patent: 3560306 (1971-02-01), Nalle
patent: 3616080 (1971-10-01), Nalle
patent: 3758359 (1973-09-01), Azuma
patent: 3905743 (1975-09-01), Bagley
Livingston Wayne W.
Melin Gerald W.
Bemis Company Inc.
Husar Francis S.
Rosenbaum Mark
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