Apparatus for molding a plastic pipe

Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – Forming baffle – bottleneck – or handle

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Details

264540, 264541, 264542, 264543, 425150, 425166, 425532, 425540, 4253261, B29C 1707

Patent

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042394740

ABSTRACT:
A lower mold half is horizontally placed. The top surface of the lower mold half is provided with a first groove of any desired shape, one end of which is closed with the other end having a notch for allowing air to be blown in. An upper mold half has a bottom surface which matches with the top surface of the lower mold half and which is provided with a second groove corresponding to said first groove. Thus, when the upper and lower mold halves are in contact, there is formed a mold cavity defined by the first and second grooves. A nozzle for discharging a parison is disposed above the lower mold half. The relative positional relation between the nozzle and the lower mold half is changed in such a manner that the nozzle follows the first groove without changing the distance therefrom so that a parison can be properly placed in the first groove. If at least two lower mold halves are provided, it is possible to carry out molding operation continuously.

REFERENCES:
patent: 1634160 (1927-06-01), Semple
patent: 2128239 (1938-08-01), Ferngren
patent: 3425092 (1969-02-01), Taga
patent: 3733309 (1973-05-01), Wyeth et al.

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