Method of and an apparatus for making preforms from a pourable s

Details Method of and an apparatus for making preforms from a pourable s Method of and an apparatus for making preforms from a pourable s

1978-05-10

1980-07-29

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

With upstream screen or perforated plate for straining,...

Plural screens or plates

425197, 425449, B29J 502

Patent

active

042148618

ABSTRACT:
A pourable substance is introduced into a container having a perforated bottom which defines, together with a mold, forming space which is to be filled with the pourable substance. The forming space has a configuration substantially corresponding to that of the preform to be made, and the pourable substance passes through the perforations of the bottom of the container and is distributed throughout the forming space, owing to vibrations to which the perforated bottom of the container, either alone or together with the container, is subjected. The pourable substance is compacted within the forming space due to the vibration of the perforated bottom so that the preform can be subsequently taken out of the mold and compressed elsewhere into a profiled article, or the profiled article can be produced from the preform directly in the mold. The bottom wall may have projections or recesses, and the wall portions bounding such projections or recesses may be solid walls, at least those surfaces which are inclined relative to the plane of vibration of the bottom. The bottom may include two juxtaposed bottom members each having a different perforation spacing and each conducting an independent vibratory movement relative to the other bottom member. The speeds of vibration of the two bottom members may be different, and so may be the vibratory trajectories thereof.

REFERENCES:
patent: 1177854 (1916-04-01), Garfield
patent: 1990634 (1935-02-01), Brown
patent: 2689597 (1954-09-01), Kinnear
patent: 2696330 (1954-12-01), Fahrni
patent: 3171872 (1965-03-01), Jarrett
patent: 3648649 (1972-03-01), Wasserman
patent: 3697208 (1972-10-01), Munk

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