Apparatus for forming deep containers
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United States of America Patent
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May 26, 1987
Grant Date -
N/A
app pub date -
May 23, 1985
filing date -
May 23, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for forming deep containers from a thermoplastic material including a first mold portion having a cavity therein defining the side and bottom configuration of the container and a second mold portion having a plunger provided for reciprocation therein and arranged so that the plunger moves into the cavity. The first mold portion is provided with a first passageway that terminates adjacent to the cavity and in the parting surface of the mold portion and a second passageway that extends therethrough into the cavity adjacent to the bottom of the container. A control apparatus is provided that directs a vacuum through the first passageway securely holding the thermoplastic against the parting surface of the first mold portion. Vacuum is then exerted into the cavity through the second passageway along with the deformation of the plastic by extension of the plug into the cavity so that the plastic conforms to the configuration defined by the cavity while maintaining a substantially uniform wall thickness free from surface blemishes caused by undue stretching or folding of the plastic sheet as it is deformed into the cavity.
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