EP0106775B1 - Verfahren zur Herstellung von Kunststoffgeweben, insbesondere für Papiermaschinen und nach dem Verfahren hergestelltes Kunststoffgewebe - Google Patents

Verfahren zur Herstellung von Kunststoffgeweben, insbesondere für Papiermaschinen und nach dem Verfahren hergestelltes Kunststoffgewebe Download PDF

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Publication number
EP0106775B1
EP0106775B1 EP19830440051 EP83440051A EP0106775B1 EP 0106775 B1 EP0106775 B1 EP 0106775B1 EP 19830440051 EP19830440051 EP 19830440051 EP 83440051 A EP83440051 A EP 83440051A EP 0106775 B1 EP0106775 B1 EP 0106775B1
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EP
European Patent Office
Prior art keywords
weft
threads
warp threads
warp
thread
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19830440051
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English (en)
French (fr)
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EP0106775A1 (de
Inventor
André Pothier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toiles Franck Sa SA
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Toiles Franck Sa SA
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Publication date
Application filed by Toiles Franck Sa SA filed Critical Toiles Franck Sa SA
Publication of EP0106775A1 publication Critical patent/EP0106775A1/de
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Expired legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths

Definitions

  • the present invention relates to the field of fabrics for forming the paper sheet of paper machines, and relates to a process for manufacturing plastic fabrics intended for this purpose.
  • the invention also relates to a plastic fabric obtained by applying this method.
  • the pulp which is a suspension in water of cellulose fibers and fillers at a concentration of about 1%, is poured over an endless sieve called canvas, through which it must drain quickly and regularly.
  • the fabrics used were metallic fabrics woven in twill weaves of 3, or knitting, these fabrics being rendered endless to the desired length by brazing or joining the canvas, and undergoing a treatment of finish before cutting to the desired width.
  • These fabrics are constituted by a number N of warp threads per cm called comb number, and by a number 5 of weft threads per cm called duitage, these numbers representing the texture are final after weaving.
  • the diameter of the weft threads is greater than the diameter of the warp threads by about 2/100 mm.
  • the warp threads are strongly wavy, while the weft threads remain practically straight, so that the warp threads are prominent in relation to the weft threads.
  • the linking of the warp threads with the weft threads is ensured by their intertwining: the weft threads pass alternately above the ply of warp threads, then below the same ply of warp threads.
  • a weave of fabric is determined by the number of harnesses and the distribution of the warp threads between the points of change of direction of the weft threads, the change of direction being made perpendicular to the plane formed by the web of warp threads.
  • the weft threads pass over two warp threads, then below the third directly adjacent warp thread, which achieves a 2-1 tying.
  • this corresponds to a float of the warp thread located on the face of the fabric in contact with the machine, and the weft thread has a float on the opposite face of the fabric, in contact with the paper.
  • the knitted wire fabrics present prominent chain floats towards the machine, resulting in premature wear of the warp threads causing deterioration of the fabrics as well as the work hardening of the threads subjected to alternating bending as well as corrosion phenomena.
  • the plastic threads used are either multifilament, that is to say constituted by twisted filaments, or monofilament, that is to say formed by a unitary horsehair of the desired diameter.
  • thermofixation is necessary to prevent excessive stretching of fabrics on paper machines.
  • This treatment also has the effect of rendering the longitudinal son less wavy, while the transverse son become significantly, so that they are prominent compared to the longitudinal son. This is one of the reasons which leads to using plastic fabrics with the weft effect on the machine side.
  • US-A-4 281 688 proposes a type of symmetrical fabric whose two faces are almost identical to the face defined above, like the machine face. This result is obtained by weaving a first weft as in the usual fabrics, then by weaving a second symmetrical weft of the first, that is to say with the elbow of the second weft on the same face as the float of the first weft and the float of the second frame adjoining the elbow of the first frame.
  • the third, fifth and seventh frames are identical to the first frame, while the fourth, sixth and eighth frames are identical to the second frame.
  • each of the frames passes above a number P of warp threads and below M other warp threads the sum P + M being constant and equal to the number of harnesses.
  • double-layer fabrics have been proposed in which the weft threads form a succession of pair of wefts superimposed in the thickness of the fabric.
  • this type of fabric is difficult to manufacture and causes cleaning difficulties, in particular when the raw materials introduced into the paper pulp are recovered fibers.
  • the present invention aims to overcome these drawbacks.
  • the invention also relates to a plastic fabric obtained by application of this method, having a weave alternating at least two modes of weft bonding, each frame passing over a number P 1 , P 2 warp threads and in below M 1 , M 2 other warp threads, P 1 + M 1 being equal to P 2 + M 2 and to the number of harnesses, with Pt ⁇ M 1 and P 2 ⁇ M 2 , characterized in that it has a weave with a number of harnesses equal to or greater than four with at least two non-symmetrical alternate weft tying modes, the warp threads of which are strongly waved in the horizontal and vertical planes.
  • the process for manufacturing plastic fabrics, in particular for paper machines essentially consists in weaving, on a existing machine with any number of harnesses, for example five, by alternating at least two non-symmetrical weft tying modes.
  • the weft threads 1 pass over two and below three warp threads 3, that is to say that they carry out a tying 2-3 while the weft threads 2 pass through above one and below four warp threads by making a binding 1-4, the weft threads 1 and 2 being alternated and their binding being offset by a warp thread at each alternation.
  • FIG. 2 A weave thus constituted is represented in FIG. 2 where the ties of the weft yarns 1 are shown diagrammatically by hatched squares 1 'and those of the wires 2 by hatched squares 2', the arrows 1 "and 2" showing the renewal of the pattern. after a step of ten.
  • the binding of the threads 1 causes the two warp threads 3 to join together, over which they pass, and this bringing together is kept as short as possible by the fact that the next double binding point separated from the first by a weft thread 2, is offset by a warp thread 3 causing an oblique alignment called diagonal, so that a single warp thread from the first bond 2-3 belongs to the second bond 2-3.
  • FIG. 6 schematically represents another mode of armor with five harnesses with a pitch of twenty and alternate tying 2-3 and 1-4.
  • the simple tying points of the weft threads 2 give a float of the weft 2 below four warp threads 3 on the face of the fabric which will be in contact with the machine, this float supporting the abrasion during machine walking and allowing an extension of the service life of the fabric thus obtained due to the large volume to be abraded.
  • the double tying points of the weft threads 1 give, on the machine side, a float of the weft below only three warp threads 3, the tying above two warp threads 3 allowing to retain a greater number of paper fibers and thus improve retention.
  • the warp thread 3 passes, as shown in FIG. 3, over four weft threads, under a thread, over a thread, under a thread, then on two threads, and again under a thread at each step, i.e. a 4/1/1/1/2/1 tying, so that the greatest chain float is carried out above four weft yarns preventing premature wear or the risk of impact rupture against an external element of the machine.
  • the warp thread 3 is thus protected, both on the machine side and on the paper side by the prominent weft threads, so that its diameter can be chosen to ensure only the essential mechanical resistance.
  • the weaving method according to the invention makes it possible to obtain meshes of variable length due to the undulation of the wefts 1 in the horizontal plane. This small desired displacement is beneficial, since the paper side of the fabric tends to form a pseudo-alignment of the binding points of the weft promoting the deposition of paper fibers and thereby improving retention.
  • the weaving mode in accordance with the invention makes it possible to obtain a slight difference in level between the consecutive weft threads.
  • the weft thread 2 is lifted by a single warp thread 3 and pulled down by four warp threads 3 so that on the paper side and on the machine side, it is slightly below the level.
  • the weft thread 1 is, on the other hand raised by two threads 3 and pulled down by only three warp threads 3, thus lying slightly above the average level, both on the paper side and on the machine side.
  • This embodiment combining a particular mode of binding of numerous weft threads and / or of large diameter, as well as a difference in level between wefts, therefore makes it possible to obtain a thicker fabric than that obtained with a 5H weaving. classic, and thus, a more dynamic draining.
  • the insertion tension of the weft threads 1 is adjusted differently depending on the mode of tying. (1-4 or 2-3 in the example described), or else, these wires 1-2 are of different natures, for example, one made of polyester, and the others made of polyamide.
  • weft threads have a diameter very much greater than that of warp threads, so that their diameter ratio is at least equal to 1.7 while in existing fabrics this ratio is always less than 1.6.
  • the amplitude a of the residual undulation of the warp threads after heat-fixing, between the crossing points of a warp thread C with two weft threads T consecutive is relatively small and is not significantly larger than the diameter of the warp threads, the protrusion beyond this diameter never exceeding 5/100 mm, so that all the warp threads remain substantially in the same longitudinal secant plane.
  • the amplitude a of the undulation between the crossing points of a warp thread C with two weft threads T is large and may exceed the value of 1.5 times the diameter of warp wire C, so that no secant longitudinal plane shows a continuous section.
  • the fabric obtained after stabilization heat treatment becomes practically non-deformable, having a low longitudinal elongation and negligible transverse shrinkage for service tensions which can reach 10 to 15 kg / cm in width.
  • the increase in transverse rigidity results in a significant improvement in the characteristics of the fabrics, which become comparable to those of double-layer fabrics and approach those of metallic fabrics.
  • the average elementary meshes obtained by applying the method according to the invention have an almost square shape, even rectangular, the longest side being oriented in the direction of the weft.
  • the invention it is possible to produce fabrics for forming the sheet of paper, single layer, used in the manufacture of papers, wadding papers, or the like, as well as cardboard boxes based on old paper, and possibly neighboring products such as asbestos panels, chemical fiber panels, particle boards, etc., having qualities of transverse rigidity, thickness, and dynamic draining significantly better than those of the usual single layer fabrics and substantially comparable to those of a double layer canvas, while being less susceptible to fouling.

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Claims (7)

1. Herstellungsverfahren für Endlossiebe aus Kunststoff, insbesondere für Papiermaschinen, bei dem auf einer vorhandenen Maschine durch Wechsel von mindestens zwei Arten von Schupfadenbindungen (1-2) ein Gewebe hergestellt wird, wobei jeder Schußfaden (1-2) über der Anzahl P1, P2 Kettfäden und unter M1, M2 der anderen Kettfäden verläuft, wobei PI + MI gleich P2 + M2 und der Harnischanzahl mit P1 ≠ M, und P2 ≠ M2, mit jedem aufeinanderfolgenden Schußfadenpaar, bestehend aus zwei Schußfäden (1-2) ist, wobei der erste Schußfaden (1) auf der Papierseite flottet, indem er über P, Kettfaden (3) verläuft, dann auf der Maschinenseite flottet, indem er unter M, Kettfaden (3) verläuft, während der zweite Schußfaden (2) auf der Papierseite flottet, indem er über P2 Kettfaden (3) verläuft, dann auf der Maschinenseite flottet, indem er unter M2 Kettfaden (3), mit P, < M, verläuft, dadurch gekennzeichnet, daß es darin besteht, im wesentlichen ein Gewebe, mit einer Harnischanzahl gleich oder größer als 4, indem mindestens zwei Arten von nicht-symetrischen Schußfadenbindungen (1-2), wie zum Beispiel P1 > P2, P2 < M1 und P2 < M2, so abwechseln, daß die Kettfäden (3), in Maschinenrichtung, nicht mehr in einer gleichen Längsebene verbleiben, herzustellen.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Gewebe mit einer starken Schußfadendichte, das heißt mit einer großen Anzahl von Schußfäden pro cm, und/oder Schußfäden mit einem deutlich über der Normalen liegenden Durchmesser, hergestellt wird, und vorteilhaft den Durchmesser der Kettfäden um einen Wert von ungefähr 70 % überschreiten kann.
3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß, um einen geringen Niveauunterschied der Schußfäden, vor allem auf der Papierseite zu erhalten, die Einzugsspannung der Schußfäden (1-2) je nach Bindungsart unterschiedlich eingestellt wird, oder auch, daß diese Fäden (1-2) von verschiedener Beschaffenheit sind.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Ausschlagweite (a) der Wellung zwischen den Kreuzungspunkten eines Kettfadens (C) mit zwei Schußfäden (T) hoch ist, und den Wert von 1,5 Durchmesser des Kettfadens (C) überschreiten kann, so daß keine schneidende Längsebene einen fortlaufenden Querschnitt erscheinen läßt.
5. Kunststoffsieb erhalten durch Anwendung des Verfahrens, nach einem der Ansprüche 1 bis 4, und eine Bindungsart aufweisend, bei welcher mindestens zwei Arten von Schußfadenbindungen (1-2) abwechseln, wobei jeder Schußfaden (1-2) über einer Anzahl P1, P2 Kettfäden und unter M1, M2 der anderen Kettfäden verläuft, wobei P1 + MI gleich P2 + M2 und der Harnischanzahl, mit P1 ≠ M1 und P2 ≠ M2 ist, dadurch gekennzeichnet, daß es eine Bindungsart mit der Harnischanzahl gleich oder größer als 4 mit mindestens zwei Arten von abwechselnden, nicht-symetrischen Schußfadenbindungen aufweist, und deren Kettfäden (3) in der horizontalen und vertikalen Ebene stark gewellt sind.
6. Kunststoffsieb nach Anspruch 5, dadurch gekennzeichnet, daß es flottende Kettfäden über höchstens fünf Schußfäden, um die besagten Kettfäden deutlich über dem oberen Niveau der Schußfäden zu halten und um sie vor jedem Risiko vorzeitiger Beschädigung zu bewahren, aufweist.
7. Sieb nach Anspruch 5, dadurch gekennzeichnet, daß es eine starke Restwellung der Kettfäden aufweist, um eine über der Normalen liegende Dicke des Siebes zu erreichen und um sehr zuverlässige Verspleißungen herzustellen.
EP19830440051 1982-10-14 1983-10-13 Verfahren zur Herstellung von Kunststoffgeweben, insbesondere für Papiermaschinen und nach dem Verfahren hergestelltes Kunststoffgewebe Expired EP0106775B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8217340 1982-10-14
FR8217340A FR2534601B1 (fr) 1982-10-14 1982-10-14 Procede de fabrication de toiles plastiques, en particulier pour machines a papier, et toile plastique ainsi obtenue

Publications (2)

Publication Number Publication Date
EP0106775A1 EP0106775A1 (de) 1984-04-25
EP0106775B1 true EP0106775B1 (de) 1988-03-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830440051 Expired EP0106775B1 (de) 1982-10-14 1983-10-13 Verfahren zur Herstellung von Kunststoffgeweben, insbesondere für Papiermaschinen und nach dem Verfahren hergestelltes Kunststoffgewebe

Country Status (3)

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EP (1) EP0106775B1 (de)
DE (1) DE3376026D1 (de)
FR (1) FR2534601B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1441840A1 (ru) * 1986-07-24 1990-09-23 Пермский филиал всесоюзного научно-исследовательского института целлюлозно-бумажной промышленности Всесоюзного научно-производственного объединения целлюлозно-бумажной промышленности Синтетическа ткана сетка дл бумагоделательной машины
US5297590A (en) * 1992-07-06 1994-03-29 Wangner Systems Corporation Papermaking fabric of blended monofilaments
US5228482A (en) * 1992-07-06 1993-07-20 Wangner Systems Corporation Papermaking fabric with diagonally arranged pockets
US7360560B2 (en) * 2006-01-31 2008-04-22 Astenjohnson, Inc. Single layer papermakers fabric

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2596803A (en) * 1947-08-07 1952-05-13 Williamson Dickie Mfg Co Woven fabric
US3094149A (en) * 1960-11-14 1963-06-18 Orr Felt & Blanket Company Paper makers felt
FR1396549A (fr) * 1964-03-13 1965-04-23 Martel Catala & Cie Ets Perfectionnements apportés aux moyens pour l'élaboration de bandes sans fin tissées à fils plastiques et à fils métalliques, ainsi qu'aux bandes correspondantes
GB1134566A (en) * 1966-04-30 1968-11-27 United Wire Works Ltd A method of weaving fourdrinier fabric for endless belts of paper or board making machines
FI56988C (fi) * 1969-06-10 1987-06-16 Huyck Corp Pappermaskinsduk innefattande sammanvaevda varp- och inslagstraodar.
CH630974A5 (de) * 1977-12-15 1982-07-15 Siebtuchfabrik Ag Papiermaschinensieb.
US4231401A (en) * 1978-06-16 1980-11-04 Unaform, Inc. Fabric for papermaking machines
US4281688A (en) * 1979-05-01 1981-08-04 Scapa Dryers (Canada) Ltd. Reversible forming fabric having dominating floats on each face
US4356844A (en) * 1980-02-11 1982-11-02 Huyck Corporation Papermaker's forming fabric
DE3044762C2 (de) * 1980-11-27 1982-11-25 Fa. F. Oberdorfer, 7920 Heidenheim Papiermachergewebe

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Publication number Publication date
FR2534601B1 (fr) 1986-08-22
DE3376026D1 (en) 1988-04-21
FR2534601A1 (fr) 1984-04-20
EP0106775A1 (de) 1984-04-25

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