Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1976-11-29
1979-04-17
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Including application of internal fluid pressure to hollow...
264 405, 264536, 264151, 264161, 264163, 425150, 425527, 425531, B29C 1707, B29C 1710
Patent
active
041500806
ABSTRACT:
A method of and apparatus for separating off waste material from a moulded article in the production of hollow articles of thermoplastics material by a blowing process in a multi-part mould involves pinching together regions of a partly-made article during closure of the mould parts around it and once a satisfactory weld seam has been created at the pinch regions then increasing the closure speed of the mould parts. Control of the mould closure speed may be effected by open loop control or by automatic control, and may be made dependent on time and/or on displacement of the mould parts. The increased final closure speed can with advantage be equal to the mould closure speed at which the mould parts are moved up to the beginning of the pinching process.
REFERENCES:
patent: 1514183 (1924-11-01), Steele et al.
patent: 3217357 (1965-11-01), Martin, Jr.
patent: 3422174 (1969-01-01), Hagen
patent: 3484897 (1969-12-01), Kovacs
Greigg Edwin E.
Kautex-Werke Reinold Hagen GmbH
Silbaugh Jan H.
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