Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Extrusion shaping means
Patent
1982-11-26
1984-11-27
Thurlow, Jeffery
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Extrusion shaping means
156500, 264173, 264174, 4251331, 425376A, 425462, 425467, B29D 2304
Patent
active
044848773
ABSTRACT:
The twin-nozzle extrusion head in accordance with the invention includes basically three axially spaced but radially overlapping annular housing members, together establishing two nozzle gaps and a first and a middle one of the two members are provided with annular feeder ducts for these nozzles. Each of these ducts has on its exit side a baffle ring wherein one baffle ring is effective on its radially inner surface while the second baffle ring is effective on a radially outer surface of larger diameter. These surfaces are nonround in a particular determined manner to establish nonuniform gap width related directly to the location of feed ducts for the annular channels, generally, the gaps are wider in locations away from a proximity of such feed ducts. The nozzle gaps are both frustoconical of different steepness and terminate in a common plane. The nozzles are particularly provided for disposing an adhesive on top of a steel pipe and a polyethylene coating and envelope on top of the adhesive.
REFERENCES:
patent: 2978748 (1961-04-01), McCauley et al.
patent: 2987766 (1961-06-01), Porter
patent: 3605190 (1971-09-01), Christy
patent: 3899276 (1975-08-01), Sokolow
patent: 3957942 (1976-05-01), Meudec
patent: 4042661 (1977-08-01), Cook
patent: 4280801 (1981-07-01), Wheeler et al.
Glissmann Karl-Heinz
Stucke Walter
Mannesmann AG
Siegemund Ralf H.
Thurlow Jeffery
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