US3017671A - Fibre web dividing tape - Google Patents

Description

R. POESCHL FIBRE WEB DIVIDING TAPE Jan. 23, 1962 2 Sheets-Sheet 1 Filed April 4, 1955 INVENTOR QQSCA/ fi a ATTORNEYS Jan. 23, 1962 R. POESCHL 3,017,671

FIBRE WEB DIVIDING TAPE Filed April 4, 1955 2 Sheets-Sheet 2 INVENTOR Eesc/( ATTORNEYS hire St 3,017,67l Patented Jan. 23, 1962 3,017,671 FHBRE WEB DIVIDING TAPE Rudolf Poesclil, 135 Mariahilferstrasse, Vienna, Austria Filed Apr. 4, 1955, Ser. No. 499,131 Claims priority, application Austria Apr. 10, 1954 1 Claim. (Cl. 19-151) Fibre web dividing tapes, also called fibre web dividing belts, are used in connection with spinning machines to divide the fibre Web, arriving in the width of the ma chine, so as to obtain neat edges, and to feed the resulting sliver to the actual spinning apparatus. The sliver adhering to the fibre web dividing tape constitutes the substance of the rove thus formed. Depending on the width of the tape, 160 tapes may be operated on the spinning machines, 80 of which move upwardly and 80 downwardly, and which altogether correspond in their total width to the fibre web of the spinning machine. Running edge on edge, these tapes divide or cut the entire fibre web without loss into, e.-g., .160 future rove strands. Instead of machines having 160 tapes 1.8 metres long there are machines having only one tape which in that case is 290 metres long and moving in manifold turns performs the function of the several tapes. In view of their intended function the belts must remain perfectly true to size in order to provide for such uniform conditions as are necessary for a uniform rove.

Such fibre web dividing tapes do not at all serve for transmitting power from one shaft to another, as in the case of transmission belts, but contact several driven shafts only in order to carry a sliver urged upon the tapes. In this connection it is of special importance that all tapes of one set should have the least possible stretch during operation if irregularities in the division of the fibre web by the several tapes are to be avoided. For the same reason it is also required that if a slight stretch occurs all bands should be stretched as simultaneously and uniformly as possible. This is important because the carding set does permit of a general re-adjustment of the roller tension but does not permit of an individual adjustment of the tension of the several fibre web dividing tapes.

Fibre web dividing tapes have been made of leather, either in the form of single tapes or of double tapes. Leather has the advantage of affording relative to the fibre web the known natural adhesion on which the function of the entire machine is based. On the other hand, leather has the disadvantage that it is penetrated within short time to a considerable extent by the so-called wool lubricant or spike oil, a mineral-oil containing spray applied onto the wool. The first result is an increased softness of the leather, with consequent stretch, this must be compensated by a tension adjustment of the machine. That stretch also involves a change in the width and thickness of the tapes whereas gaping begins at the cracks formed in the leather after some time under the action of mineral oil and at the joints Where the tapes are spliced together. At the sharp edges and corners thus formed the fibre web will be carried along in an irregular manner; this has an adverse effect not only on the quality of the yarn but also on the uniformity of the woven fabric to be prepared subsequently.

Whereas it is highly desirable, for the reasons stated above, to replace the leather with another material, in view of its tendency to stretch unevenly and too easily, it has not been possible before to make fibre web dividing tapes from such material. Leather, e.g., having a tensile strength of 300 kg./ sq. cm. has a coefficient of friction of 0.33 and cotton fabric having a tensile strength of 500 kg./sq. cm. has a coefficient of friction of 0.30, Whereas high-tensile silk and Perlon fabrics have a tensile strength of 1000 kg/ sq. cm. but a coefficient of only 0.25. Stretched molecule oriented poly-amides having a tensile strength of 200 kg./ sq. cm. have a coefiicient of friction of 0.20 where-as steel having a tensile strength of 4000 kg./sq. cm. has a coeflicient of friction of only 0.15. Fibre web dividing tapes made from such material cannot fulfill the required function because their surface is too smooth to enable such tapes to feed any or suflicient quantities of fibre web.

In the fibre web dividing tape according to the invention the aforementioned difficulties are overcome because it consists of a high-tensile carrying strip of steel or plastics, such as polyamides, po'lyvinylchloride, rubberized fabric or the like, which has at least on one face a covering of rougher material such as velvet, cork, or the like.

Such fibre web dividing tapes comply with all requirements in a most perfect manner because they combine the good running properties of plastic strips with a surface affording a good grip not possessed by the plastic strip itself. Whereas with transmission belts the low stretch thereof is of interest, the value of the present invention resides in the invariable width and thickness of the fibre web dividing tape. For this reason the fibre web dividing tapes running crosswise in opposite directions maintain contact at the edges so that at the crossing point thefibre web is cut with neat edges, as by scissors, and is not torn. The high importance of that property is due to the fact that the tapes must be ordered and supplied in accordance with the grooves of the machine with an accuracy of tenths and hundredths of a millimetre. For this reason the absence of knots in the rove is directly related to the ensurance of the width of the tape and the edge contact according to the invention.

Preferably the high-tensile carrying strip consists of a polyamide strip, which is stretched to orient the molecules and molecule groups in the direction of the tensile stress. Such oriented stretched polyamide strip may be formed in a simple manner by extruding polyamides in the form of continuous strips, foils, tubing, or the like, at suitable temperature above 200 deg. C. in an extrusion press through dies, narrow slots, or the like, or by rolling on hot rolls while the material subjected to a special tensile stress in the outgoing direction. It is also possible to make the strips, foils or the like first and to cold-strain them thereafter.

With fibre web dividers it is usual to provide an deg. axial turn in one tape end before the tape is spliced, to cause the tape to run in spiral for-m. With high tensile strips of stretched polyamides or the like this fact gives rise to a tendency of the tapes to crack in their longitudinal direction. By the arrangement of a rougher covering according to the invention, that tendency is opposed too because the covering applied to the high-tensile band either prevents any longitudinal cracking or, where such cracking does take place, ensures the coherence of the two separated parts of the high-tensile insert. The covering of rougher material may be applied only on one face of the thigh-tensile material or on both faces, or may be formed as a sleeve entirely enclosing the high-tensile strip. It has been proved most suitable to apply on the high tensile strip a covering which consists of a leather strip or of leather patches. If desired the covering may be formed directly on the high-tensile carrying strip consisting of stretched polyamides, polyvinylchloride, rubberized fabric, etc.; this may be effected by pasting fibrous material such as leather wool, leather meal, or the like, on the carrying strip. Alternatively the covering may be formed by the application of a textile fibre spray containing appropriate binders.

Illustrative embodiments of the invention are shown diagrammatically in the drawing.

FIG. 1 is a perspective view of a fibre web dividing tape covered on both sides,

FIG. 2 shows an overall arrangement of a fiber web divider and a tape condenser, and,

FIG. 3 shows a fragmentary diagrammatic view of the two cylinders of a fiber web divider and the dividing tapes.

The fibre web dividing tape according to FIG. 1 consists of a high-tensile carrying strip 1, of steel or of plastics such as polyamides, polyvinylchlor-ide, rubberized fabric, or the like, which has on both faces a covering 2 of rougher material, e.g. of leather, velvet, textiles, cork or the like, which is adhesively connected to the hightensile strip by a suitable adhesive, by vulcanization or the like.

FIG. 3 shows two cylinders 3 and 4 of the fiber web divider. A fiber web 5 is adapted to be fed between the nip of the two cylinders 3 and 4, and 6 denotes the tapes of the present invention. The tapes 6 are in edge-to-edge contact with each other. The fiber web 5 is divided by the tapes 6 into strips of roving 7.

FIG. 2 shows an overall arrangement of a fiber web divider and a tape condenser. A web to be divided is indicated 5, and only one dividing tape 6 is shown for simplicitys sake. The tape is shown to have a twist of 180 and, 8 are the rubbing leathers.

The manufacture of a fibre web dividing tape according to the invention is eflected by first cutting a plastic strip to accurate dimensions in width and length or a rnultiple thereof, for later division, and covering the strip at least on one face, normally on both faces, with the covering of leather, velvet, cork or the like. The covering, which may be applied either as a continuous strip or in the form of short =lengths is suitably bonded to the hightensile band in an undetachable manner by an appropriate binder or adhesive. As has been mentioned, an alternative procedure resides in covering the plastic band with a cement, whereafter leather wool, obtained from leather which is roughened by scratching, is strewn or sprayed onto the adhesive. The long-fiber leather wool may be replaced by leather meal, which affords a very smooth surface after the adhesive has set. Textile fibres may also be sprayed on the carrying strip. According to the invention the high-tensile carrying strip should have a tensile strength of at least 500 kg./sq. cm. and the rough covering should have a coefiicient of friction of at least 0.3.

What I claim is:

In a spinning machine having a plurality of conveyor tape runs with a twist of arranged initially in a substantially edge-to-edge contact for receiving a web of textile fibres and then separated alternately to divide the Web into sharply cut apart strips of rove fibres, a fibre web conveying and dividing tape comprising an endless tape strip of a stretched polyamide having its molecules oriented in the direction of stress on the tape and having a tensile strength of at least 500 kgs. per square centimeter which is dimensioned to resist the tensile force and prevent any material stretching and narrowing of the tape during normal use, a leather layer fully covering both sides of the tape, said layer having a coefficient of friction of at least 0.3 and serving for conveying the fibres, and an adhesive intimately securing the leather layer on the tape strip, said tape having parallel side faces and sharp corner edges of leather and serving to divide and convey a layer of the textile fibres in a substantially uniform distribu tion.

References Cited in the file of this patent UNITED STATES PATENTS 568,014 Beaumont Sept. 22, 1896 1,648,064 Schimek -2 Nov. 8, 1927 2,188,332 Carothers Jan. 30, 1940 2,191,367 Carothers Feb. 20, 1940 2,302,332 Leekely Nov. 17, 1942 2,322,779 Gocher et a1. June 29, 1943 2,491,188 Lesesne Dec. 13, 1949 FOREIGN PATENTS 65,134 Denmark Nov. 25, 1946

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