Presses – With flexible or deformable pressure surface
Patent
1992-03-03
1994-10-18
Gerrity, Stephen F.
Presses
With flexible or deformable pressure surface
99495, 100110, B30B 502, B30B 922
Patent
active
053557905
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a diaphragm of a press intended for separating liquid and solid materials wherein the fabric of the diaphragm has a particular thread system.
DESCRIPTION OF THE PRIOR ART
Diaphragms of the above mentioned kind have become known among other things through pneumatically or hydraulically driven presses (CH-PS 604 841).
The pressing pressure exerted in the pressing space by air pressure or water pressure against a mash consisting of fruit, grapes, produce or berries located in the pressing space produces a drainage from which the squeezed-out juice leaves the pressing space through a drainage system consisting of ducts or a perforated vessel wall.
The pressing cycles necessary for extracting the juice from the mash are normally repeated in several time intervals. The partially squeezed-out mash is loosened up between the pressing cycles.
To absorb the pressure in the pressing space and to convey this pressure against the mash or other products, a diaphragm made of a fabric of yarn or the like that is coated on both sides with plastic has been generally used. Two thread systems forming warp and filling are interlinked with one another into a fabric by upward and downward interweaving movements.
At the point of intersection the thread systems partially loop around one another into interlacing points and cause the yarns or threads to come out not smooth but crimped.
This crimping is responsible for a so-called structural stretching, by which the crimping is drawn almost smooth as a result of the tensile load on the fabric. It thus becomes apparent that the dimensional stability in a direction diagonal to the warp and filling of the fabric is insufficient and the load is transferred to the plastic coating which is completely unsuited for this purpose.
The high tensile and shear forces lead to the destruction of the bond between fabric and coating and cause bubble-like hollow spaces between the plastic layers. The surfaces of the plastic layers then come loose from the fabric and afterward break out of the fabric structure.
This condition makes such a diaphragm completely unusable, since it can no longer fulfill the function of imperviousness between pressure space and pressing space in a pressure vessel.
SUMMARY OF THE INVENTION
This deficiency in prior art diaphragms has led to the object of the present invention, in which a diaphragm of the initially mentioned kind is to be made whose resistance to damage is significantly improved.
According to the invention this object is attained by a particular thread system.
As a result it becomes possible to reinforce the diaphragm by appropriate measures on the parts thereof which are subjected to high stresses, either by a controlled alignment of the thread systems or by an additional provision of a thread systems according to kind and direction of the stress on the diaphragm.
It is particularly advantageous to provide a diaphragm which is fastened to the outer vessel wall in a plane passing through the central longitudinal axis of a cylindrical vessel lying in horizontal position and the diaphragm has at least a half vessel shape and an approximately semi-circular part facing the front wall of the vessel. The semi-circular diaphragm part consists of several segment-like sections, so that in each case one of the thread systems forming a fabric runs approximately parallel to the radial center bisector of a segment-like section. In other words, the diaphragm part facing a front or end wall of the vessel that is particularly stressed by the pressure spreading approximately perpendicular to the vessel wall experiences a significantly better deformation stability. With just two such segment-like sections a noticeable improvement of the wear properties in the semicircular diaphragm parts occurs through the alignment of the thread systems in divergent directions. Three segment-like sections further reinforce the semicircular diaphragm part.
Alternatively, a similar sheet whose thread systems run approximately diagonal to the
REFERENCES:
patent: 2014264 (1935-09-01), Patrick
patent: 4024810 (1977-05-01), Braun
patent: 4476799 (1984-10-01), Bandy
patent: 4679519 (1987-07-01), Linville
patent: 5038700 (1991-08-01), Conrad
Bucher-Guyer AG Maschinenfabrik
Gerrity Stephen F.
Jaskiewicz Edmund M.
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