US2933775A - Web dividing tapes or spinning tapes for textile machines - Google Patents

Description

A nl 26, 1960 x H. SIEGLING 2,933,775

WEB nxvmmc was 0R smmmc TAPES FOR TEXTILE MACHINES Filed Oct. 1, 1956 /NVENTOP the better will the roving be.

nIvInING TAPES R SPINNING TAPES FOR TEXTILE MACHINES Hellmut Siegliug, Hannover, Germany Application October 1, 1956, Serial No. 613,050 2 Claims. (Cl. 19--151) This invention relates to spinning tapes or web dividing tapes for textile machines.

The web dividing tapes are provided in the web divider for conveying the wool or fibre web from the comber to the rubbing apparatus, and in this operation the web is divided into strips which are preferably as uniform as possible. The web strips are worked to the state of roving. The more uniform the web strips are, In the web divider there are generally about 160 to 180 web dividing tapes. In order that the web in its full extent does not become distorted as it is fed along, but can be divided into equal strips with many edges, the web dividing tapes must all have the same thickness and must move at the same speed, and must be of like length and like breadth, must have the same tension sharp edges, and adequate adhering qualities. Another requirement is that there should be no formation of electrostatic charges between tape and web strip.

Web dividing tapes of leather, metal (more particularly steel) rubber, fabric and. other materials arealready known. However, it is diflicult with leather tapes to comply with the condition that the whole surface of the web dividing tapes should travel uniformly, since it is difiicult to produce leather bands'in lengths of several hundred metres so as to have uniform structure. Oil and fat, which are contained in the web, also have a detrimental efiect on leather tapes-and also on rubber tapes. The spinning lubricants soften the leather and make it spongy. As a result, not only does the leather tape develop differences in thickness, but it becomes permanently expanded, and the edges of the tapes become rounded or deformed. It is true that permanent elongation of the leather tapes can be compensated for by adjusting the rollers, up to .a certain extent, but since there are usually many web dividing tapes in spinning machines, and the permanent elongation of the individual tapes differs, the web dividing tapes which have been subsequently re-tensioned in this way have different tensions from one another. Thus, many sag downwards and some become very slack. The amount by which the tapes can be re-tensioned is limited, and there are undesirable interruptions in working if the tapes have to be shortened. Only too often the web dividing tapes can notbe shortened, since they are always made narrower by each subsequent stretching. As soon as the web dividing'tapes are reduced in width from their original width and no longer have sharp edges, the web can no longer be divided up into equal strips.

The surfaces of leather web dividing tapes are often too rough, so that small fibres of wool remain adhering to the web dividing tapes, and the fibre web or webs lose material. In order to eliminate this disadvantage, use is often made of grain leather, which has a relatively smooth surface. Since the web dividing tapes are gen erally connected with one turned through 180 with respect to the other, two tapes have been glued together at their flesh sides, so as to give grain sides both top and ice bottom. However, the grain side of the belts swells owing to the influence of spinning lubricants, becomes wavyand fissured, and in time starts to come away in 'istrips, resulting in the web being torn apart. A further disadvantage of leather web-dividing tapes is that the connection becomes unfastened by the action of the lubricants and the edge-of the connection bends upwards and scratches the web as a result of which the web loses its uniform structure. Similar phenomena occur if, owing to electrostatic charges, fibres become loosened from the web strip; alternatively, the whole web strip can only be released from the conveying tape with difliculty.

In order to obviate these difficulties, experiments have already been made with steel tapes, and these have also been used in practice. But steel tapes have also proved unsatisfactory despite their homogeneity and uniform thickness and sharp edges, since the adhesive power and therefore the conveying ability of steel conveying tapes is too poor.

Finally, it has also 'been proposed to use polyamide tapes, and to cover them with leather, cork or the like so as to obtain better adhering qualities. It is true that these web dividing tapes do not expand subsequently in a permanent manner, owing to their elastic property, nor do they become narrower, but they are not all of equal thickness throughout their entire length, and'in the course of time they develop blunt edges or their surface is too rough, or, if grain leather is used, the disadvantageous phenomena already described occur.

All these difficulties are obviated by the invention. The invention consists in that the Web dividing tape or spinning tape comprisesthree layers which are welded together, the central layer consisting of a polycaprolactam of the polyamide group, while the outer layers are composed of mixed polyamides consisting of 66.6% of hexamethlene diammonium adipate and the balance e-caprolactam, which polyamides are mixed with a plasticiser benzene sulphonic acid methylam-ide with an addition of a mixture of paraforinaldehyde and benzene sulphonic acid methylamide.

The middle layer of polycaprolactam with organised molecules ensures constant length, width and tension of the tape. The outer layers of mixed polyamides with plasticisers provide good ability to adhere to the web strips, and they are completely resistant to oil and fat. Their surface is completely uniform; they retain their sharp edges; no electrostatic charges are produced. The novel tapes can be produced without difiiculty to have the same thickness over-their whole extent, and can be connected endlessly in the machine easily and rapidly, even when they are crossed. Moreover, a joint is soft and homogenous and can scarcely be distinguished from of a mixture of paraformaldehyde and benzene sulphonic acid methylamide.

What I claim is:

1. A multi-layer web dividing tape comprising, a central layer consisting of polycaprolactam, and two outer layers composed of mixed polyamides consisting of 66.6% of hexamethylene diammonium adipate and the balance e-caprolactam, with which polyamides are mixed a plasticiser benzene sulphonic acid methylamide and with an addition of a mixture of paraformaldehyde and benzene sulphonic acid methylamide, said central and outer layers being welded together.

2. A multi-layer web dividing tape or spinning tape comprising, an inner layer at polyeaprolactam and two outer layers of mixed polyamides welded to said inner 5 2,244,208

layer; said mixed lpolyam'ides c onsisting of 56.6% of hexeimethylene diammonium adipate and; the bzilnnce e-caprolactam, said mixed polyamides having had added thereto a plasticiser consisting of benzenesulphonie acid methylamide and with an addition of a mixture of para- 10 formaldehyde and benzene sillphonic' acid methylamide.

t 4 s References Cited in the file of this patent UNITED STATES PATENTS Schimek Nov. 8, 1927 Miles June 3, 1941 OTHER REFERENCES APC Publicatibn Ser. No. 367,723, May 11, 1943.

Claims (1)

1. A MULTI-LAYER WEB DIVIDING TAPE COMPRISING, A CENTRAL LAYER CONSISTING OF POLYCAPROLACTAM, AND TWO OUTER LAYERS COMPSOED OF MIXED POLYAMIDES CONSISTING OF 66.6% OF HEXAMETHYLENE DIAMMONIUM ADIPATE AND THE BALANCE E-CAPROLACTAM, WITH WHICH POLYAMIDES ARE MIXED A PLASTICISER BENZENE SULPHONIC ACID METHYLAMIDE AND WITH AN ADDITION OF A MIXTURE OF PARAFORMALDEHYDE AND BENZENE SULPHONIC ACID METHYLAMIDE, SAID CENTRAL AND OUTER LAYERS BEING WELDED TOGETHER.

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