US1500124A - Filter-press cloth - Google Patents

Description

July 8 HALE FILTER PRESS CLOTH Filed July 26 e Patented July 8, 1924.

y UNHTEE YATES HARRY c. HALE,

eena era QEFFEQEE,

OF BALTIMORE, MARYLAND, ASSIGNOR- TO WILLIAM E. I-IOOPER AND SONS COMPANY, A CORPORATION OF MARYLAND.

FILTER-PRESS CLOTH.

Application filed July 26,

To all whom it may concern:

Be it known that I, HARRY C. HALE, a citizen of-the United States of America, residing in the city of Baltimore, State of Maryland, have invented certain new and useful Improvements in Filter-Press Cloths,

of which the following is a specification.

In the manufacture of cotton seed oil and in other similar processes where a liquid is obtained by filter pressing a finely divided solid or semi-solid material as ground cotton seed or fruit, the material being pressed is wrapped in a cloth called a press cake clot-h which holds the solid material permitting the liquid to escape by filtration through the cloth. The cloth, in order to hold the solid material beingpressed, and to withstand the pressure sufficiently to prevent the es cape of the latter, which would cause the solid to be mixed with the liquid, must be of a thickness corresponding to the pressure to be applied to it. Such pressure ordinarily depends upon the nature of the material being treated. The present invention having been developed in connection with the treatment of cotton seed in the production of cotton seed oil, the disclosure relates particularly to the treatment of this commodity though the invention is capable of 39 a more general application.

The fabric used in the wrapping of the.

filter cake, i. e., the filter cloth, must in the treatment of materials requiring high pres sure to extract the liquid therefrom as does the portions thereof which are subject to the direct pressure of filtration particularly where there is but a single thickness of the fabric covering the filter cake. However, Q0

portions are not subject to the full pressure applied to the cake, and do not perform the passed through them being also passed through at least one other thickness. of the fabric.

filtering is extremely heavy, being composed of twenty or thirty ounce duck and. is proportionately expensive, and as it is used in considerable quantities, any saving which can be made in the weight of the fabric as .55 a whole, which means a corresponding save cotton seed, be correspondingly heavy as tov there are certain portions of the fabric, par-' full duty of filtration, the liquid which is 1923. Serial No. 653,972.

ing in the fiber used and a proportionate saving in cost is of great importance.

In view of the necessity for economy in this connection, the inventor has produced a filter press cake wrapper or cloth composed or constructed of a fabric especially manufactured for this purpose, which fabric is heavy and closely woven at the center, the weight and the closeness of the weave being reduced as to the edge portions by reducing the number of threads per inchover a margin of several inches, or whatever seems desirable in view of the size of the filter cake, at each side. In this way a considerable percentage of the weight and hence of the expense of the fabric is saved, and none of the utility thereof whatever is sacrificed; the filter cloth being so constructed and folded in operation that these edge portions are 1 always overlapped in wrapping the material so that they take neither the full stress in cident to supporting the material during pressing nor the full pressure of the liquid in filtration meaning that a single thickness of the material is not subjected to the pressures referred to.

In the accompanying drawing I have illustrated a filter press cloth embodying the features of my invention.

In the drawing:

Figure l is a plan showing the filter cloth open, viewing it from the upper side which comes next to the material in wrapping.

Figure 2 is a perspective view of a filter cake cloth, made in accordance with invention.

Figure 3 is a plan of a fragment of the fabric of which the cloth of my invention is made;

Figure l is a cross section of the wrapped filter cake taken on the line 4-4t of Figure 2.

Figure 5 is a side elevation of the filter cake wrapped ready for pressing as shown in Figure 4.

Referring to the drawings by numerals,

the press cake cloth as shown in Figure 1 consists of a central longitudinally 'extend- The fabric which is used in high pressure its central portion 5,;extending the length of 'the material, of considerably increased e h and, cl seness of tex e as compared to the edge portions, 6, the said thinner edge portions, 6, being in the cloth illustrated some three or four inches wide. The differences in weight and texture referred to between the edges and the central portion of the strip are preferably effected by varying the number of Warp threads to the mob, it being understood that the warp extends from left to right of the press cloth as shown in Figure 1; said warp threads being indicated by reference character, 7, and the weft by reference character, 8. The arrangement of the weft is uniform throughout. The number of warp threads per inch in the edge portions referred to being reduced to lighten the fabric and at the same time causing it to be of a looser texture. Preferably the longitudinal edges, 9, of the fabric strip, 2, are uncut, the fabric being woven of the desired width.

The fabric strip, 2, woven with the thick, heavy closely woven central edges, 6, is regarded as an important feature of my invention.

The side flaps, 3-4, may to advantage be likewise constructed of similar material, i. e., a fabric strip having a central longitudinally extending portion, 10, of increased weight and closeness of texture as compared to the edge portions 11-12, it being understood that in neither instance is it important that the light edge portions be of uniform width. In fact the side flaps 3-4: are shown as woven with a narrow edge portion, 12, of decreased weight and looser texture on one side, and a wider edge portion, 11, of similar light looser texture on the other side, the narrow edge portion, 12, being sewed to the center strip, 2, adjacent the central heavier portion, 5, thereof, and there being one such flap on each side, the longitudinal edges of the side flaps being laid parallel to the corresponding edges of the center strip, the warp threads of all three memhers being parallel and it being understood that the variation in texture of the side flaps is produced in the same manner, i. e., by varying the number of warp threads to the inch as described in connection with the center strip.

The wrapped press cake, 14, is shown in Figures 2, 4 and 5. The wrapping of the press cake is accomplished by placing the material to be pressed on the center strip be tween the side flaps. The side flaps are then folded inward over it and the ends 15--16 .of the center strip are folded over the side flaps, one being laid over the other as illustrated in Figures 2, 4c and 5, the package being then ready for pressing. It will be noted on examination of Figure 2 that the sides 17, of the package are upright and are covered by the heavier portion 10 of the side flaps, the lighter edge portions, 11, being folded over the top and then covered by the ends, 1516 of the center strip, 2, and from further examination of the drawing it will be noted that each side, 17, of the package is covered by at least one thickness of the heavy fabric, the overlapping material being in the main of the lighter, looser texture, but it is not feasible in every instance to avoid entirely the overlapping of the heavy portions of the fabric. The wrapper as arranged avoids this to such an extent as to effect a very considerable saving in the textile fiber used in the manufacture of the cloths without any loss whatever of efficiency, at the same time making the cloths lighter, more flexible, and therefore, easier to handle.

It is possible and feasible to make filter press wrappers or cloths in accordance with the principles of the invention for various other purposes than those referred to herein, as, for instance, cloths for use in pressing apples and other fruit in the manufacture ofcider, and in some instances it is found desirable to change the relative position of the thin and thickened portions of the cloth to conform to necessities presented, by the particular process in which cloths are used.

I have thus described specifically and in detail a single filter press cloth embodying my invention in order that the nature and operation of the same may be clearly understood. However, the specific terms herein are used descriptively rather than in a limiting sense, the scope of the invention being defined in the claim.

What I claim and desire to secure y Letters Patent is A filter press cake wrapper composed of i woven fabric consisting of a center strip and s1de flaps, the center strip having warp threads in the central portion thereof, closely laid, and Warp threads in the edge por tions thereof less closely laid producing a heavy closely woven central portion, and a comparatively lightloosely woven edge portion, the side flaps likewise having a heavy closely woven central portion and a lighter more loosely woven edge portion, the thickened portion of the centre strip serving to cover the top, bottom and ends of the press cake, and the thickened portions of the side flaps serving to cover the sides of the press cake, the lighter edge portions serving to hold the flaps in position substantially as described.

Signed by me at Baltimore, Maryland, this 20th day of July, 1923.

HARRY C. HALE.

' Witnesses:

HOWARD H. Toms,

LAWRENCE G. YEAGLE.

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