Presses – Methods – With separation from material of liquid expressed
Patent
1995-11-22
1996-12-03
Gerrity, Stephen F.
Presses
Methods
With separation from material of liquid expressed
100 45, 100 50, 100104, 426231, 426489, B30B 902
Patent
active
055796834
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for supplying material for pressing to a filter press having a press chamber for separating solids and liquids in the material for pressing; the material for pressing is supplied to the press chamber and there is pressed out under the influence of a press element acted upon by compressive force.
BACKGROUND OF THE INVENTION
In discontinuous filter presses of this kind, the liquid component of the material for pressing is carried to the outside via filter, under the influence of a pressing pressure. The pressing pressure is exerted upon the material for pressing directly via a rigid pressure plate, or pneumatically or hydraulically via a flexible diaphragm. At the onset of supply of the material for pressing, the question arises as to what amount must be prefilled in the press chamber so that an adequate pressing cushion will be available for the first pressing. Care must be taken that with the pressure plate or diaphragm extended, the ratio between the effective filter surface area and the instantaneous press chamber volume is higher than with the press element retracted.
The press is overfilled if the ratio between the effective surface area and the instantaneous press chamber volume becomes too small as a consequence of an overly large pressing cushion, the result being worsening of the juice extraction output. In known pressing methods, the material for pressing was supplied in such a way that filling is done during a constant prefilling time chosen on the basis of empirical values. Experience has taught that for materials that are difficult to press, only a fraction of the time appropriate for readily pressed material is needed as the prefilling time. Particularly when fruit is pressed, it proves to be very difficult to ascertain an optimal prefilling time, because the pressability of the materials fluctuates very sharply from one batch to another.
SUMMARY OF THE INVENTION
It is therefore the object of the invention to disclose a method for supplying material for pressing to a filter press which produces an optimal output and yield in the separation of liquids and solids.
According to this invention, this object is attained in that in a first step, the material for pressing is supplied uninterruptedly to the press chamber, and at the same time by means of pressing strokes of the press element, a plurality of pressings are performed, and that in a second step, the pressings are continued, and the supply of material for pressing to the press chamber is interrupted during the pressings.
Advantageous embodiments of the method can be learned from the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Exemplary embodiments of the invention are described in further detail in the ensuing description and in the drawing figures. Shown are:
FIG. 1, a section through a pneumatically driven press of a known kind;
FIG. 2, a section through a chamber filter press of a known kind;
FIG. 3, a section through a filter press with a pressing piston, along with a graph showing the course over time of piston strokes, pressing pressure and supply of the material for pressing; and
FIG. 4, a flowchart for a first step of the filling method according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A pneumatically driven press of a known kind for performing the method of the invention is shown in FIG. 1. It has an elongated cylindrical pressing tank 1, inside which in whose central plane a flexible diaphragm 2 is secured. The diaphragm 2 divides the pressing tank 1 longitudinally into a pressure chamber 3 and a press chamber 6. The pressure chamber 3 is supplied with or drained of compressed air via an opening symbolically represented by a double arrow 4. The material to be pressed is supplied to the press chamber 6 via an opening 5. Under the influence of the compressed air in the pressure chamber 3 upon the diaphragm 2, the liquid component of the material for pressing flows via a filter 7 in the press tank 1 into a collecting conduit 8, from which it is rem
REFERENCES:
patent: 4467715 (1984-08-01), Bunger
patent: 4568549 (1986-02-01), Melandri
patent: 5207154 (1993-05-01), Bonnet
patent: 5275740 (1994-01-01), Spyker et al.
Bucher-Guyer AG Maschinenfabrik
Gerrity Stephen F.
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