Roll-type press for extruding a filled or a multi-layer strand o

Details Roll-type press for extruding a filled or a multi-layer strand o Roll-type press for extruding a filled or a multi-layer strand o

1995-10-24

1997-12-16

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

4251311, 4251331, B29C 4706

Patent

active

056982330

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a roll-type press for extruding a filled or multi-layer strand of plastic compositions, said press comprising
a casing which contains on either side of a center plane one inlet channel and one pressure channel each,
a jet arrangement, in the direction of which the pressure channels converge,
a first rotatably driven feeding roll and a second rotatably driven feeding roll which are arranged within the casing on each side of the center plane between one of the inlet channels and the associated pressure channel and have their axes of rotation defining a transverse plane, and
two additional rotatably driven rolls which are arranged within the casing each on one side of the center plane and form together each with one of the feeding rolls one nib each.
In a roll-type press of the aforementioned kind as disclosed in DE-AS 12 62 572, a first feeding roll and a second feeding roll are arranged symmetrically to and at a small lateral distance from a vertical center plane, and above each of said feeding rolls an applicator roll having a saw-tooth shaped roll profile is arranged, also in a symmetrical fashion in respect of the center plane and at the smallest possible distance therefrom. In this manner, two nibs are defined through which a plastic composition each from a farther outwardly disposed inlet channel will be fed in a downwardly inclined direction towards the center plane. The two composition flows are kept separate from each other by guide plates placed between the feeding rolls, until they discharge, below the feeding rolls, into a common jet arrangement from which they will be extruded in the form of a two-layer strand.
The object of the present invention is to further develop a roll-type press in such a manner that it is enabled to gently process more than two compositions at the same time to a filled or multi-layer strand.
According to the present invention, this object is attained on the basis of a roll-type press of the kind mentioned thereabove in that
on the side of the transverse plane remote from the jet arrangement at least a third feeding roll is arranged to which a third inlet channel and a third pressure channel are assigned, and in that
the third pressure channel runs between the first and the second feeding roll to lead to the jet arrangement.


SUMMARY OF THE INVENTION

The present invention is based on the realization that room for a third feeding channel can be made available between the first and the second feeding rolls without the first or the second pressure channel needing to become considerably extended as compared with the roll-type press presumed to be known (DE-AS 12 62 572). The third feeding roll and, if necessary, another roll associated with it, for example an applicator roll, can be disposed as a compact unitary assembly above the first and the second feeding roll and the additional rolls therewith associated in such a manner that neither the third pressure channel would be excessively long.
Further modifications of the present invention are defined in the claims.


BRIEF DESCRIPTION OF THE DRAWINGS

In the following, embodiments of the present invention will be described with reference to schematic drawings. In FIGS. 1 through 3 three different roll-type presses each designed for three different compositions are illustrated each in a vertical section view.


DETAILED DESCRIPTION OF THE INVENTION

Each one of the three roll-type presses illustrated has a casing 10 which is built up, in a symmetrical manner with respect to a vertical center plane A, of a left-hand casing half 12 and a right-hand casing half 14, and is supported by a frame 16. As shown in FIG. 1, a lower casing insert 18 and an upper casing insert 20 are installed into the casing 10, both said inserts also being symmetrically configured relative to the center plane A; the lower casing insert 18 is an integral element, whereas the upper casing insert 20 is composed of a left-hand insert part 22 and a right-hand insert part 24. The upper casing inser

REFERENCES:
patent: 660717 (1900-10-01), Barber et al.
patent: 4264294 (1981-04-01), Ruiz
patent: 4647467 (1987-03-01), Pinto
patent: 4687429 (1987-08-01), Simelunas
patent: 4748031 (1988-05-01), Koppa

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