Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Patent
1979-04-05
1981-07-07
Woo, Jay H.
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
366323, 425208, B29B 106
Patent
active
042771820
ABSTRACT:
An extruder having a multichannel wave screw is disclosed wherein at least one portion of the screw is provided with a helical passage that is divided into a pair of parallel flow channels. The helical passage is defined by a helical conveying land which extends radially outwardly to a first diameter from the screw root, which defines the bottom surface of the helical passage. To divide the helical passage into the pair of flow channels, a helical barrier land extends radially outwardly to a second diameter which is less than the first diameter. Each flow channel is further characterized by the existence of an undulating screw root which defines a plurality of waves, each with a crest and a valley. The crests of one flow channel are helically displaced relative to the crests of the adjacent flow channel. In addition, the difference between the second diameter and the first diameter is selected such that plasticated synthetic resinous material may flow from one flow channel into the other flow channel while unplasticated particles are subjected to intensive shearing forces by the crests of the respective flow channels. The wave cycle of each flow channel, defined as the distance between successive crests, is relatively short, e.g. less than about 360.degree. along each channel (i.e., less than about one full screw turn). Preferably, the wave crests are positioned 180.degree. apart along the channel.
REFERENCES:
patent: 3517095 (1970-06-01), Dunnington et al.
patent: 3897937 (1975-08-01), Limbach
patent: 4053143 (1977-10-01), Hosokawa et al.
patent: 4079463 (1978-03-01), Miller
patent: 4099897 (1978-07-01), Takano et al.
patent: 4173417 (1979-11-01), Kruder
patent: 4184772 (1980-01-01), Meyer
Hoffman John F.
HPM Corporation
Jeffers Albert L.
Woo Jay H.
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