Threaded bunghole for plastic containers

Details Threaded bunghole for plastic containers Threaded bunghole for plastic containers

1977-08-04

1978-05-30

Hall, George T.

Receptacles

Closures

Removable closure guided in rotary movement

B65D 5300

Patent

active

040919609

ABSTRACT:
A threaded bunghole structure for plastic containers is disclosed which requires no gaskets, has a warp-free sealing surface, and is leakproof. In one embodiment, the structure is formed by insert blowmolding over a female-threaded metal flange such that the outermost plastic-to-metal interface border is disposed inwardly from the sealing surface. In a second embodiment, an annular metal insert is disposed between plastic blowmolded threads and a sealing surface.

REFERENCES:
patent: 3432069 (1969-03-01), Craig
patent: 3437231 (1969-04-01), Carpenter

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