Method of making a hollow molded product

Details Method of making a hollow molded product Method of making a hollow molded product

1991-07-17

1993-03-30

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

2643287, 2643288, 26432812, 26432813, B29C 4500, B29D 2200

Patent

active

051981777

ABSTRACT:
A mold for hollow injection molding has an inlet for admitting a fluid into the molten resin when injected to form an interior hollow in the molded product. The inlet is opened and closed by retraction and advancement of a movable pin having at least a portion to fill the inlet and close it. When the inlet is closed, while the resin is being injected, the pin has a portion which projects out of the inlet into the space where the resin is injected. When the inlet is opened, the retraction of the pin leaves a short passageway in the injected resin leading from the fluid inlet for flow thereinto of the hollow-forming fluid. Preferably, the pin is stepped with an inlet-closing large rear portion and a smaller projecting forward portion which is located in and has an annular clearance with the inlet when it is open. The pin may be detachably connected to a movable plunger, operated by fluid or spring pressure, to enable replacement by pins of different lengths, sizes, etc.

REFERENCES:
patent: 4474717 (1984-10-01), Hendry
European Search Report EP 91 11 1422, dated Mar. 18, 1992.

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