Blowing head for making a synthetic-resin tube

Details Blowing head for making a synthetic-resin tube Blowing head for making a synthetic-resin tube

1983-03-29

1984-12-18

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

Including heating or cooling means

264 406, 2642097, 4253261, 425380, 425467, B29F 308

Patent

active

044888619

ABSTRACT:
An apparatus for forming a thin-wall and flattenable synthetic-resin tube has inner and outer nozzle parts generally centered on a common axis and defining an annular passage centered on the axis. At least one of the parts is formed with an annular and substantially closed chamber juxtaposed with the passage and extending axially therealong. A hot plastic mass is fed under pressure to one end of the passage so that it passes axially along the passage to emerge from the other end thereof as a tube. A body of liquid partially fills the chamber, this liquid being vaporizable generally at the temperature of the hot mass in the passage. Thus the liquid is vaporized at hot spots of the passage and the vapor thus produced condenses in cool spots of the passage. The space in the chamber above the liquid body is normally largely evacuated. The liquid may be water.

REFERENCES:
patent: 2796632 (1957-06-01), Willert
patent: 3385917 (1968-05-01), Breukink et al.
patent: 3525125 (1970-08-01), Berger et al.
patent: 3726743 (1973-04-01), Reifenhauser et al.
patent: 3822977 (1974-07-01), Hinrichs
patent: 3926706 (1975-12-01), Reifenhauser et al.
patent: 3930768 (1976-01-01), Zimmermann et al.
patent: 3950118 (1976-04-01), Adair
patent: 3957566 (1976-05-01), Rahifs
patent: 4088434 (1978-05-01), Fukuda et al.
patent: 4339403 (1982-07-01), Upmeier et al.

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