Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – With heating or cooling means
Patent
1979-07-19
1981-05-12
Silbaugh, Jan H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
With heating or cooling means
264521, 264525, 264534, 425524, 425527, B29C 1707
Patent
active
042669278
ABSTRACT:
Apparatus and method are disclosed for closing and sealing a molded plastic article formed by expanding a heated plastic parison within a chamber or cavity defined by a plurality of mold sections. The article is closed and sealed by at least one movable sealing member which has a protruding pinch surface to weaken or sever the parison and recess surface portions selectively above or below the protruding pinch surface which provide plastic-receiving reservoirs that aid in the formation of an unobtrusive seal adjacent the surface of the article. The sealing member may also include parison engaging seat or heel portions which further aid in the sealing operation. The temperature of the mold sections adjacent the sealing operation is controlled to selectively retard the cooling of the parison, which is in direct contact with the cavity surface, to maintain the parison at a sufficiently elevated temperature to permit closing and sealing by the sealing member.
REFERENCES:
patent: 3390425 (1968-07-01), Sheptak
patent: 3423495 (1969-01-01), Bachner
patent: 3464085 (1969-09-01), Burkett et al.
patent: 3499071 (1970-03-01), Hurst
patent: 3592885 (1971-07-01), Goins et al.
patent: 3619857 (1971-11-01), Gilbert
patent: 3817676 (1974-06-01), Seefluth
patent: 3942932 (1976-03-01), Gilbert
Gilbert Robert W.
Torau Gunther W.
Baxter Travenol Laboratories Inc.
Caruso John A.
Flattery Paul C.
McFarron Gary W.
Silbaugh Jan H.
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