DE1419465A1 - Process for the production of an endless piece of fabric - Google Patents

Description

The invention relates to a method of manufacture an endless piece of fabric or endless woven belt, e.g. a paper machine felt, of the type such as it in the production of pulp, paper, cardboard, asbestos panels and pipes or the like, is used. Such felts can be woven in endless form, or they can just be woven, and in this case become the ends joined together * so that they are known per se Yteise result in an endless web of fabric. Originally such felts were made entirely from woolen yarn, or especially in the case of felts for the production of asbestos-cement

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zeu .- .; nisr, en from oinor combination of ./olle and uauni wool manufactured. i.'it de:;, advent of liylon, polyester and similar synthetic fibers, v / been found that by Manufacture of felts from yarns from a. mixture are composed of // ollfibres and synthetic fibers, the The abrasion resistance of the felts was largely improved and the mushrooms had a longer useful life.

If ο in felt for the paper industry consists entirely of ollj or a mixture of j / olle and synthetic fibers, the v / alken forms an essential work step in the production of the that on the paper otherwise recognizable v / ary, obscured, while the üaujfähi ^ ¹ ^ eit ejenüber .. 'ater is maintained at a high tfert.

3IS recently ^ AIT ea al3 wichti _t ^ri, would that the proportion of contained in the felt synthetic fibers must be less than a fraction of a V / alkene of the felt in a significant i * iaße prevent, üb was jedooh found recently that If an endless piece of fabric made for the lance or predominantly of synthetic fibers is roughened on one of its surfaces or on both and the roughened fabric is subjected to processing with reproach made of solid comes close enough for use as paper machine felt

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uiLtels iladelri is introduced in belie.-ijor bek.-i.initer 'ieise augjofuhrt, sw iii ("J en dor jo'.vebte J to Ji") in a Laochine in which the surface' Tea Jewebe'j nit, ^ rof.ler iirjufi _r ; he: 'ΐ von mit .v': i derhaLen verse-! ioj.en j.Adeln will pierce what üur L ¹ Ol ^ e has, dal .: the il-iRse the ii ' -Hsorn u: der i? 'L ^.: -Ciie, whose j.''A: .nrn aufoind, .in the round tissue einje ^ ojen Vierden.

iüt in v ^ cjIüü i? '- lleri oin lan. j In ^ -UUOrUde3 "j-, your" (needling) required, ui., f-ie .lufjoi-j shared F.'iiaern in the ^ ev.'ebten Hurnpf oes otoffeü au lost. Iiifolje der l - ,. nj, en: ''. Auor am "ii ^; uieliio" b -.- st-li "; the 'IefaLr of the occurrence ο of i: /; ei significant,. _{' Ur 1 -JeIn} . HrateTiK best ';"it the ie ° r,' ir a substantial reduction in the ^r u. ' the ifilijeG nacii a prolonged processing mittelrj Iladeln the iüilfte their ursorünglicnen ".'ertes reduced WITD ^1. Dieüe Yei'irdnderun ^ absorbency has ness an adverse influence on the JescLwindi ^, with which, when the J ¹ IIz oicli on a 1-aper ^. as the machine is in operation, the water is removed from the paper web by the felt. "v / eitenn break many of the

of the fibers both on the surface on which the fibers are erected, as well as threads or ciarne in the interweaving of the felt. This has a Jchwächun ^ of Jewebes to FoI ^ e, and this is a greater LaL'e for ,, uality · -.. Vulnerable ;. tsverminderung by neclj'.mjiücheri abrasion "Gad

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The Jrfindunn; now creates a process for i-Ierstel-. 'lun ^' of an endless piece of weave in whole or for the most part made of synthetic fibers, which are suitable for use as paper machine felt, but not learner exposed by needles and therefore not exposed to the adverse effects resulting therefrom needs to become.

The term "endless piece of tissue" is fe in follow is to not only refer to a fabric that is woven endless, so the shot is at your in the loom in the finished fabric for the chain, but also a fabric web, die.als piece of a certain length woven and the ends of which are then joined together. In the present specification, therefore, the term "warp" means the group of yarns which lie in the longitudinal direction of the finished endless product, for example "a drying felt for papermaking", and the term "weft" means those yarns which lie in the transverse direction of the finished product. The proportion of the yarns in synthetic fibers can consist of a number of continuous threads or staple fibers, and where "synthetic fibers" or "fibers" are referred to in the following and in the claims, both types are to be understood by this.

Awake of the invention is an endless piece of fabric with Suitability for use as a dry felt for paper machines, at least predominantly made of synthetic fibers

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is made, characterized in that each other neighboring fibers at the point of their contact with one another are adhesively connected.

A method of making such endless pieces of fabric useful as paper machine felt, the consist at least predominantly of synthetic fibers, is characterized according to the invention in that after the "/ just exposes the felt to the action of an aqueous solution of an inorganic salt, which in concentrated Form a swelling and a dissolving or near dissolving effect on at least some of the synthetic Fibers exerts such that it causes neighboring fibers to run against each other at their points of mutual contact, and that one then the solvent by washing, eliminated.

The aqueous solution can preferably be made to concentrate and, preferably in the area of the contact points, to collect after the solution has been applied to the tissue. ^:

In the case of G-eweaves that are entirely or predominantly made of Hylon and / or acrylic fibers such as Orion (registered Trademark, owner B.I, du Pont de Nemours & Co.) or Courtelle (registered trademark, owned by Courtaults Ltd.), suitable salts are calcium and lithium bromide and calcium and magnesium thiocyanate. In the event that the substances consist entirely or predominantly Polyester fibers, such as perylene (registered trademark,

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Owner Imperial Chemical Industries limited) or Dacron (registered ilandelsmarlce, · owner 13.1. Du .. Pont de Uemours ώ Co.) exist or a substantial proportion of such fibers in addition to acrylic -

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and / or polyamide fibers are suitable Salts calcium and l'Iagnesium-l'hiocyanate.

In the implementation of the invention, a dance or predominantly made of synthetic fibers is used Endless piece of fabric suitable for use as a felt for paper machines or the like with an aqueous one Solution of a suitable salt soaked and the water from the piece of tissue "evaporates, so that the salt solution is concentrated. While concentrating, the saline solution has the tendency to predominantly to collect at the crossing points of the fibers. As the evaporation of the water progresses, the Saline solution finally sufficiently concentrated, and small parts of the fiber surfaces at the crossing points begin to gelatinize, and when complete Evaporation of the "lassers" will adjoin the fibers fibers attached. The inorganic salt is then washed out of the fabric with a barrel.

'Jena, an endless piece of fabric for use as a felt for paper machines is composed of a mixture of two synthetic fiber materials , a salt is used which is able to cause the surfaces of both fibers to swell and to dissolve or gelatinize. For example, if the fabric made of nylon and

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'rylene is composed, - calcium or magnesium thioeyanate is used as the reagent. The concentration of inorganic salt in the impregnating liquid 'need only 0.5 wt. # Amount, is preferable although each other, the use of 2 to 5 Solution filgev for reliable attachment of parsers are, and the solution may have a concentration of the inorganic reagent of up to 10 wt. <Fo have.

The invention is described below using an example.

A continuous length of fabric of a configuration suitable for use as a paper machine felt has Eett and weft yarns spun from crimped E'ylon staple fibers. The substance is stirred at room temperature for 15 minutes in a solution containing 5 wt. F »lithium bromide treated (4 gallons per 10 pound) are used by the 34.5 per 1 10.kg synthetic fibers The impregnated fabric is centrifuged and then dried in a PiIzstreeismmaschine, of which at least one cylinder is heated. In the cup in which the water from the fungus evaporates and the lithium bromide is concentrated, this has the tendency to collect at the crossing points of the fibers, and gelatinization at these points causes the fibers to adhere to one another will. When the fabric is completely dry, it is washed in water until it is free of lithium bromide, centrifuged and dried again on the mushroom stretcher. ,.

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The above represents only one possible implementation of the In accordance with the invention, any suitable method of soaking and drying can be used, and concentration and the amount of the keagent salt can be changed without departing from the spirit of the invention.

Furthermore, the G-ewebe does not necessarily need to be in its entirety made from spun synthetic yarn too and, as already mentioned above, the general references to "synthetic pasers" and "pasers" no restriction in the description and in the claims on the.! fibers of such yarns. For example The warp yarns can be spun from synthetic crimped fibers or from straight synthetic staple fibers may be synthetic yarns made from continuous filaments or synthetic stretch-free yarns Bulky yarns with continuous threads, e.g. Taslan structural yarns or yarns (Taslan-textured yarns), those made of a core, made of synthetic yarn made of continuous pads and wrapped around them finer yarn with Taslan structure yarn. The weft yarns are preferably synthetic Spun staple fibers, however, these staple fibers can be the industrially produced synthetic crimped fibers be or they can be prepared »by having the industrially manufactured known as bulk yarns, stretch yarns and bulk and stretch yarns Yarns made from continuous load on the length of sta-

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cut up fiber fibers.

In addition, the process of meeting one another can be learned fibers according to the invention with advantage in the G-änze or predominantly synthetic paper machine felts of the type described in patent $ r (patent application .......) Kind are used in which the weft yarns are spun from mixtures, the shrinkable fibers contain.

In the case of " U ¹ IIaWi for use" in certain types of paper machines, it is advantageous to roughen the fibers on one or both surfaces of the endless piece of fabric with the reagent solution before twisting. In the case of other types of felt, it is preferable to tack the fibers together by soaking them, to evaporate the absorbed water, to wash the fabric and only then to straighten the fibers on one or both surfaces. Even if the erection in this case loosens the bond at some of the stapling points between the superficial fibers, these fibers are still attached under the erected surface,

the and / by erecting the unimpaired fibers of the

Of course, yarns still cling to each other.

In areas where a particularly good connection at the adhesive points is required , the fabric can be pressed against the heated cylinder of the felt stretching machine by means of a relatively heavy roller during the drying process following the impregnation.

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Claims (8)

AQ claims 1. Boundless, piece of fabric suitable for use ale Papiermasclixnenfilz ι that at least predominantly ^ synthetic fibers are made, characterized that adjacent fibers are stapled together at their mutual points of contact. 2. Process for the production of an endless piece of tissue with suitability for use as paper machine felt, which consists at least predominantly of Kunatetoff fibers, characterized in that after weaving The felt of the action of an aqueous solution is an inorganic one Exposed to salt, which in concentrated form has a swelling and dissolving or almost dissolving effect exerts on at least some of the synthetic fibers so as to cause adjacent fibers to adhere to one another their mutual points of contact to each other, and that one then the inorganic salt through faschen eliminated, 3. Process for the production of an endless piece of fabric with suitability for use as paper machine felt, which is at least predominantly made of synthetic fibers' - 10 - 809812/1249 stands, characterized in that, after the V / exposes the fungus to the action of an aqueous solution of an inorganic salt, which is concentrated in lorm has a swelling and loosening or almost loosening effect on at least some of the synthetic fibers, so that "neighboring fibers are caused to attach to each other their mutual points of contact to each other, and that · one then the inorganic salt through Washing eliminated, the aqueous solution being concentrated and initiated as a further step before washing is mainly in the area of these points of contact after attaching the solution to the tissue piece. 4. A method for producing an endless piece of tissue suitable for use as a paper machine felt according to claim 3 »characterized in that the piece of tissue is at least predominantly made of a polyamide fiber, such as nylon and / or acrylic fiber, Z ₀ B. one of the registered trademarks Orion and Courtelle commercially available fibers, and that the inorganic salt is selected from a group consisting of calcium bromide, lithium bromide, calcium thiocyanate and magnesium cyanate. 5 »Process for the production of an endless piece of fabric suitable for use as a paper machine felt according to claim 3, characterized in that the Piece of fabric at least predominantly made of a polyester * - BATHROOM ORIGINAL 11 - 809812/124 "9 Plastic fibers, e.g. those under the Terylene trademarks or Dacron buying high pasers, or one contains a substantial proportion of such a fiber in addition to polyamide and / or acrylic fibers, and that Eian that selects organic salt from the group, the calcium thiocyanate and magnesium thiocyanate. 6. Process for the production of an endless piece of fabric with suitability for use as paper machine felt according to claim 4 or 5 »characterized in that the concentration of the inorganic salt at the beginning is between 0.5 and 10 percent by weight. .7. Process for the production of an endless piece of fabric with suitability for use as paper machine felt according to claim 4 or 5 »characterized in that that the concentration of the inorganic salt is between 2 and 5 wt. #, 8. Uacli the method according to any one of claims 2 "to 8 produced endless piece of fabric. BQ S & 4 ^ 7 Λ 2 49 BATHROOM - 12 -