US1794624A - Metallic cloth for paper-making machines - Google Patents

Description

Q MarCh 3, 1931. KASTNER 1,794,624

ME AL-Lie CLOTHFOR PAPER MAKING MACHINES F iIed Sept. 4, 1 928 2 Sheets-heet 1 m/ven/ To)? March .3, 1931. I R. KASTNER 1,794,624

METALLIC- CLOTH FOR PAPER MAKING MACHINES Filed sea. 4, 192a z'sjneet s-sneet 2 Patented Mar. 3, 1931 PAeTENT OFFICE.

31cm x'asrnna, or s rnmnmunrz, AUSTRIA METALLIC GLOTH FOR PAPERJEAKING ES Application filed September 4, 1928, Serial No. 903,945, and in Austria December 24, 1926.

5 warp and weft there is point contact between the metallic cloth and the surfaces contactin with it. This point contact leads to high local pressures and causes relatively rapid wearof the metallic cloths. Attempts 1 have been made to reduce the bulging places of the warp by using warps havinga flattened cross-section." It has also been proposed to make metallic cloths with a two have-the disadvantage that they mark the papers too strongly.

- The present invention has for its object to provide a metallic cloth, the essential feature of which is, that the fabric makes linear contact with the surface in contact with it and which does not have the disadvantage of producing sieve markings in thepaper The metallic cloth according to the invention is characterized by the featurethat it is woven with a multiple weft i. e. a double or multiple weft, the two or more wefts being incontact with one anotherdnthe weave. Preferably for a metallic clot such a fabric is used having a plain wea e. Other weaves have the disadvanta e compared with plain weave that they mar the paper. In a fabric such as that according to the invention the warp threads orwarp wires therefore he on the surface for a'greater distance than in an ordinary weave and the portions of the. warp threads or wires lying over and under the weft have a straight axis run- Sue the usual point contact of the well-known metallic woven or braided fabrics, that local pressures in the wearing surfaces can be considerably reduced, thus saving the material and increasing its life and durability. The same e eat as with a double or ple weft can be obtained with a weft of anlar, for instance rectangular, or flat, for

1nstance oval, cross-section.

'Hence,"for manufacturing a woven fabric according to the invention with round warp wire warp. Such metallic cloths, however,

niniparallel to the plane of the cloth or sieve. I

a line contact has this advantage overmulti wires a weft is used consistingnf a wire of flat or elongated cross-section or of two or more wires of round cross section.

The use of two or more wires as weft has. the advantage that .with a fabric having the same weight per unit area a thinner metallic I fabric or sieve is obtainable than with a single weft, for, if instead for instance of a single wire-of diameter d and weight g per meters run twowires of diameter d be used,

each of which per meters run weights only for the same weight a thinner woven fabric is obtained than is the case when a single weft is used and the fabric will be considerably more. flexible, which is of great advantage more especially for sieves and metal cloths whichas endless bands travel over rollers and the like. v

The invention thus also provides means for considerably increasing the flexibility of metallic cloths or metallic fabrics.

The invention is shown diagrammatically in the accompanying drawings in which Fi 1 shows a cross section taken through a we t wire of a metallic cloth accordin to the presentmventiom m wh1ch w1res 'o a flattened cross-sectlon are usedas the weft and wlres I with a round crossssection are used as the warp. 1

Fig. 2 shows'an' illustration similar to Fig. 1 of another embodiment of the invention.

Figs. 3 and show another embodiment of the invention in which the weft consists of two wires having a round cross section.

Fig. 5 shows an embodiment of the invention similar to Fig. 3 in which at the seam of the metalliccloth weft wires of larger diameter are woven in.

Fig. 6 illustrates: diagrammatically the process in the manufacture of the wire cloths. In the examples shown in Figs.'1 and 2 wires of a' flattened cross-section are used as the weft b. The example of 2 has this advantage over that '0 Fig. 1, t at the warp wires above and below the weft run in a straight line and thus oifer a linecontact wit the surfaces resting on them.

In the example. of Figs. 3 and 4 the weft consists of two wires 6, b. The wires bear the reference letter a. The portions of the warp wires lying above and below the multiple weft b, b have a straight axis -parallel to the plane of the sieve.

The constructional form shown in Figs. 3 and 4 has certain advantages where seams have to be made for forming endless bands. As is well known, in making seams for forming endless bands, the two ends of the fabric are placed with corresponding warp wires opposite one another and are sewn together with a sewing wire which is passed helically' over the weft wires lying on either side of the joint. In the fabric with double wefts shown in Figs. 3 and 4, owing to the fact that the/sewing wire is not itself specially exposed to wear, as has been the case in the constructional forms used hitherto, but is supported by the weft threads which present a broad surface, a substantial strengthening of the seam is attained. Q

The seam may be further strengthened by the weft wires lying on either side of it being of somewhat larger diameter d overa suitable length or breadth of the fabric, for instance the breadth e of 5 to 10 cm. (Fig. 5), whereby the fabric on either side of the seam forms a pad and the sewing wire it can recede somewhat with respect to the outer surface of the fabric, sothat it is protected from becomng worn.

a are the warp wires and b the double Wefts. a

The manufacture of such a wire cloth is effected by picking one and the same weft b :by means of a single shuttle or other device, two or more times in succession into the same shed formed by the warp a. In order,"howfully occupying the recesses to sustain the sheds of the warp wires in planes parallel to the plane ofthe cloth. I v

3. A metallic cloth for paper making machines comprising warp wires, the sheds of the warp wires defining substantially flat recesses, and a plurality of weft wires having intimate contact with each other and occupying the recesses and serving to sustain the sheds of the warp wires in a plane for a major portion of their length in planes parallel to the plane of the cloth.

4. A metallic cloth for paper making machines comprising warp and weft wires, the sheds of'the warp wires forming throughout their length elongated recesses, the weft wires being rectangular in cross section for fully occupying said recesses.

In witness whereof I have hereunto slgne my name.

RICHARD KASTNER.

ever, that the weft, in its reversal, may not be drawn out of the shed again, one or more warp wires '5 (the drawing shows three by way of example) are arranged at the lateral edge of the cloth, and the weft b is bound in with the warp wires i before its reversal,

these Warp wires 71 changing the shed and the weft b forming with them a selvedge of the breadth 7c. By arranging such a selved'ge only on one side of the -fieve cloth, the weft can be picked twice, and by arranging it on both sides it can be icked asoften as desired in the same shed o "the warp a What I claim is:

1. A metallic cloth for paper making machines com rising weft and warp wires, a plurality o weft wires arranged side by side and in contact with each other said weft in the sheds formed bythe warp wires.

2. A metallic cloth for paper making ma-' chines comprising weft and warp wires, the

sheds of the wa wires forming elongated recesses, and in w 'ch at least two weft wires are placed in contactwith, each other and

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