Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With accumulator – trap chamber – or serially arranged valves...
Patent
1996-09-26
2000-01-25
Heitbrink, Jill L.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With accumulator, trap chamber, or serially arranged valves...
2643281, 425562, B29C 4554
Patent
active
06017210&
ABSTRACT:
To avoid generation of air bubbles and silver which otherwise may be caused due to forced retraction of a dwelling plunger after a dwelling cycle is completed. A dwelling cycle is performed at the same time of metering by using an injection machine 1 and a dwelling machine 2. The injection machine 1 comprises an injection screw 11 mounted in a heating cylinder 12. The dwelling machine 2 comprises a dwelling plunger 21 slidably mounted therein and faced to a resin passage 14. An advancing motion of the dwelling plunger 14 is limited to the side surface of the resin passage while a backward movement of the dwelling plunger is limited to a position at which a desired volume of a resin trap 26 is formed for the resin to be packed in the passage between the head of the plunger and the resin passage 14. The dwelling plunger 21 is allowed to be in a free state during an injection cycle or the metering. The dwelling plunger 21 is retracted by means of a pressure of the resin to be injected or a pressure of a metered resin to from the resin trap 26. The resin in the resin trap 26 is forced into the resin passage 14 as the dwelling plunger 21 moves forward when the injection cycle is completed and the valve 16 is closed to block the resin passage 14. This provides the dwelling.
REFERENCES:
patent: 4342717 (1982-08-01), Gardner
patent: 4784819 (1988-11-01), Spurr
patent: 5071341 (1991-12-01), Poehlsen
patent: 5135701 (1992-08-01), Farrell
Takayama Kazutoshi
Takizawa Kiyoto
Heitbrink Jill L.
Nissei Plastics Industrial Co. Ltd.
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