Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Patent
1980-07-15
1981-12-29
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
264 406, 264514, 264557, 264559, 264560, 264565, 264566, 264569, 264178R, 264180, 425 71, 425 72R, 4253261, B29D 720
Patent
active
043081924
ABSTRACT:
A molten thermoplastic resin is extruded in the form of a double-layer cylindrical hollow film with the two film layers being interconnected with each other by a number of spaced legs and is then immediately passed through an annular gap defined by annular side walls of inner and outer vessels in such a manner that the two film layers are in contact with the respective side walls defining the gap. Coolant is supplied to the inner and outer vessels and overflows above the side walls to bring the coolant into contact with the resin. The level of the coolant overflowing above both side walls is adjusted to be equal and also to have a liquid pressure on the extruded resin balanced with a gas pressure supplied in between the two film layers and the legs of the extruded resin.
REFERENCES:
patent: 3193547 (1965-07-01), Schott, Jr.
patent: 3655846 (1972-04-01), Kanoh et al.
patent: 3812230 (1974-05-01), Takahashi
patent: 3825641 (1974-07-01), Barnett
patent: 4003973 (1977-01-01), Kurokawa et al.
Okada Masao
Ono Masayoshi
Thurlow Jeffery R.
Ube-Nitto Kasei Co., Ltd.
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