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EP0656967B1 - Toile de mise en forme - Google Patents

Toile de mise en forme Download PDF

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Publication number
EP0656967B1
EP0656967B1 EP93919118A EP93919118A EP0656967B1 EP 0656967 B1 EP0656967 B1 EP 0656967B1 EP 93919118 A EP93919118 A EP 93919118A EP 93919118 A EP93919118 A EP 93919118A EP 0656967 B1 EP0656967 B1 EP 0656967B1
Authority
EP
European Patent Office
Prior art keywords
threads
group
transverse
transverse threads
screen according
Prior art date
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 - Lifetime
Application number
EP93919118A
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German (de)
English (en)
Other versions
EP0656967A1 (fr
Inventor
Daniel Zimmermann
Liam Maher
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.)
Siebtuchfabrik AG
Original Assignee
Siebtuchfabrik AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siebtuchfabrik AG filed Critical Siebtuchfabrik AG
Publication of EP0656967A1 publication Critical patent/EP0656967A1/fr
Application granted granted Critical
Publication of EP0656967B1 publication Critical patent/EP0656967B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • D21F1/0036—Multi-layer screen-cloths

Definitions

  • the invention relates to a forming fabric for the sheet formation section of a paper machine, consisting of a more than single-layer, in particular flat-woven, fabric made of plastic threads with longitudinal threads extending in the machine direction and transverse threads extending transversely thereto, a first group of transverse threads lying in the plane of the paper side and there floated over longitudinal threads, the number of which is at least as large as the number of transverse threads over which the longitudinal threads float on the paper side, and the plane of the machine side being formed exclusively by a second group of transverse threads.
  • a conventional paper machine essentially consists of three consecutive lots.
  • the paper web is dewatered or dried in different ways in the individual lots.
  • the paper web is supported and guided by so-called paper machine clothing.
  • the so-called sheet formation section a forming wire is used for this.
  • the liquid to pulpy fibrous material is applied to this.
  • This is then removed from the forming fabric and guided to the second section, the so-called press section.
  • press felts which generally consist of a base fabric and a non-woven fabric needled on it at least on the paper side.
  • the drying section the paper web is essentially thermally dewatered by being passed over heated drying cylinders almost without pressure. It is supported by so-called dryer fabrics, which dryer fabrics can be designed as a fabric or as wire link belts.
  • forming fabrics serve primarily to form a paper web from a liquid mass, so that there is not already a coherent paper web - as in the press and dryer sections.
  • forming fabrics serve primarily to form a paper web from a liquid mass, so that there is not already a coherent paper web - as in the press and dryer sections.
  • the behavior of the individual fibers in relation to the forming fabric must therefore be taken into account, a requirement that naturally does not arise in the press and dryer section because of the paper web already formed there.
  • the demands are often conflicting, meaning that they can only be met by compromise.
  • a forming fabric must have a good separating effect, that is to say hold the paper fibers on the paper-side surface of the forming fabric on the one hand and effect good drainage on the other.
  • the property called fiber retention the fibers on the Holding the forming fabric must also be combined with the ability to prevent parts of the fibers from being drawn into the forming fabric and thereby creating a sheat-sealing. The latter not only results in a reduction in dewatering performance, but also makes sheet removal at the end of the forming wire more difficult due to the interlocking with it.
  • a generic paper machine screen is disclosed for example in EP-A-0-390 ⁇ 0 ⁇ 0 ⁇ 5. It has long floating cross threads on the machine side that only form the plane of the machine side and thus protect the longitudinal threads from abrasion. On the paper side, longitudinal and transverse threads are bound in such a way that a monoplane surface is created if possible. Both the longitudinal and the transverse threads have a circular cross section in a conventional manner. This has one Series of disadvantages.
  • the support of the individual fibers is not satisfactory on the paper side.
  • the conical gaps in the opening due to the round cross-section result in some of the fibers being drawn into the inside of the sieve, thereby producing at least one toothing between the fabric and the fibers which is harmful to the paper removal. This also results in a high surface roughness of the paper and poor printability.
  • Another disadvantage is that dynamic pressure fluctuations, which occur in the water being carried when driving over machine parts of the wet end, easily penetrate to the paper web and lead to markings there.
  • the invention has for its object to develop a forming fabric of the generic type so that significantly improved conditions with regard to the formation of paper web and in terms of abrasion properties are created.
  • transverse threads of the first group lying in the plane of the paper side are flattened. Since the flattened transverse threads on the paper side extend transversely to the main direction of the fibers of the paper stock, this results in optimal fiber support with a significantly reduced risk that part of the fibers will slide into the inside of the wire.
  • the flattened cross threads act like small, transversal plateaus, which effectively take the pulp fibers with them and, because they are oriented in the running direction, provide them with optimal support without the risk of slipping.
  • the toothing effect occurring with round threads is largely avoided and in this way the sheet removal at the end of the sheet formation section is made considerably easier.
  • the basic idea of the invention can also be realized in forming fabrics, in which the first group of transverse threads consists of at least two subgroups of transverse threads, of which a first subgroup forms normal transverse threads and a second subgroup forms filling transverse threads.
  • the filling transverse threads can have floats that go over more longitudinal threads than the longest floats of the normal transverse threads, as a result of which the above-described transverse plateau effect is particularly pronounced.
  • the floats of the flattened cross threads can be designed according to the respective requirements. In the case of a one-and-a-half-ply fabric, the longest floats should go over at least four longitudinal threads, in a double-ply fabric over at least three longitudinal threads and in a three-ply fabric over at least one longitudinal thread.
  • the flattened transverse threads of the first group have a fiber support width which is at least 9% larger than that of a circular thread with the same cross-sectional area.
  • the fiber support width should preferably be at least 15% and particularly advantageously at least 30%.
  • the fiber support width is to be understood as the width of a flat thread surface that arises when 10 ⁇ % of its height, ie the extent transverse to the plane of the fabric, is removed from the paper side of the respective transverse thread.
  • the degree of coverage of the transverse threads of the first group in one and a half and double-layer fabrics without filling transverse threads is at least 32%, better still 37% and preferably at least 42 or even 47%, better still 52%.
  • the degree of coverage is defined as the product of the previously defined fiber support width (in cm), the number of threads (thread density) per cm screen length and the number 10 ⁇ 0 ⁇ . If different types of threads are used for the first group of transverse threads, separate degrees of coverage are determined for each thread type. The total degree of coverage then corresponds to the sum of the degrees of coverage of the individual types of cross threads. In the case of two-layer fabrics with filling cross threads or at least three-layer fabrics, the degree of coverage should be at least 40%, better still 50% or even 55% and preferably 60%.
  • Such a design has the advantage that the essential properties of the forming wire no longer change so strongly and then in a much more uniform manner than in the case of forming fabrics in which these transverse threads are designed as round threads.
  • This is due, on the one hand, to the fact that the contact surface of the forming fabric does not change as much during abrasion or - in the case of rectangular transverse threads - practically does not change, and that the transverse threads nestle better against the underside of the forming fabric because of their greater flexibility, so they do not protrude as much .
  • the latter has the consequence that the length of the abrasion surface changes only insignificantly over time. Optimization options are also opened up here. While maintaining the thickness of the forming fabric, considerably more abrasion volume can be made available.
  • the thickness of the forming fabric can be reduced with the same abrasion volume. Precisely because the transverse threads of the second group protrude on the machine side, these transverse threads can be used to exert a strong influence on the one hand with regard to the abrasion volume and on the other with regard to the thickness of the sieve.
  • the transverse threads of the second group should float over at least four longitudinal threads in the case of a one-and-a-half layer fabric and over at least five longitudinal threads in the case of a double-layer fabric. In the case of a double-layer fabric, a differentiation can be made according to the number of shafts in the transverse threads. With a number of fourteen shafts, the transverse threads of the second group should float over at least ten longitudinal threads and with a number of sixteen shafts over at least twelve longitudinal threads.
  • Ratio of the maximum to the standard abrasion surface is a maximum of 2.9, better still 2.2 and preferably 1.7 or even better 1.4.
  • the machine surface contact surface with the elements of the paper machine is referred to as the abrasion surface of a thread floating on the machine side.
  • the maximum abrasion area means the largest contact area which arises in the course of wear of the transverse threads.
  • the contact surface is defined as the standard abrasion surface, which occurs after removal of 10% of the height of the respective transverse thread, that is to say the extension of the relevant thread transverse to the tissue plane.
  • the degree of coverage should be over 52% for transverse threads in the second group, better still over 62% if the fabric is one and a half layers.
  • the degree of coverage of the cross threads in the second group should be over 40%, better still over 45%, and in the case of a double-layer fabric with fill cross threads in the first group over 32%, preferably over 37%.
  • the degree of coverage should be over 45%, better still over 50 ⁇ %.
  • transverse threads flattened according to the invention with such longitudinal threads.
  • the flattened longitudinal threads should be arranged so that their cross-sectional extent in the tissue plane is greater than transverse to the tissue plane and that The ratio between the cross-sectional extent in the tissue plane to the cross-sectional extent transverse to the tissue plane is between 1.2 and 2.2.
  • the flattened longitudinal threads should have an area of 0 ⁇ , 15 to 0 ⁇ , 226 mm 2 .
  • the flattened transverse threads of the first group expediently have an area of 0 ⁇ , 0 ⁇ 13 to 0 ⁇ , 195 mm 2 , that of the second group an area of 0 ⁇ , 0 ⁇ 22 to 0 ⁇ , 4 mm 2 .
  • the flattened threads can have any cross-sectional shape, provided that the conditions of the basic idea of the invention are observed. Particularly suitable are oval, in particular elliptical and, above all, rectangular cross sections, the latter preferably with chamfered edges. However, other thread shapes can also be used, for example trapezoidal or rhomboidal ones.
  • the surface unit which is designated “cm 2 ", extends in the tissue plane.
  • the fabric is at least three layers and the layers are connected to one another by binding threads
  • the cross-sectional area should go from 0 ⁇ , 0 ⁇ 12 to 0 ⁇ , 0 ⁇ 62 mm 2 .
  • the one and a half-layer forming screen (1) shown in the figures (1) and (2) has longitudinal threads (2) which are circular in cross section and which extend in the machine direction (MD).
  • the forming fabric (1) also has a first group of transverse threads (3) with a circular cross section.
  • a second group of transverse threads (4) which have a rectangular cross section, the extent transverse to the plane of the forming fabric (1) being less than in its plane.
  • the integration of the longitudinal threads (2) and the first group of transverse threads (3) is such that a monoplane top, i.e. H. Paper side is created.
  • a longitudinal thread (2) binds every fifth transverse thread (3) of the first group.
  • the transverse threads (3) of the first group float over four longitudinal threads before they bind with one longitudinal thread (2) (see FIG. 2). This creates a distinctive transverse structure on the paper side of the forming fabric (1), d. H. the transverse floats of the transverse threads (3) of the first group dominate the paper side.
  • the second group of transverse threads (4) floats to the machine side over a total of nine longitudinal threads (2) before these cross threads (4) tie in with a longitudinal thread (2). Since the cross threads (4) are the same compared to a round cross thread Cross-sectional area are significantly more flexible, they have no arc shape. Rather, because of their conformability, they run straight between the ties with the longitudinal threads. This fact and the rectangular cross-section have the consequence that the abrasion surface, ie the surface with which the forming screen (1) rubs over the stationary parts of the paper machine, hardly changes with increasing wear. The change in sieve thickness per unit of time is less than when using cross threads of round cross-section and remains essentially constant. This means that the sieving properties change only slightly and then only very uniformly while the forming sieve (1) is running.
  • the embodiment shown in Figure (3) of a two-layer forming fabric (5) has round longitudinal threads (6) and a first group of transverse threads (7) on the paper side and a second group of transverse threads (8) on the machine side.
  • one cross thread (7) of the first group lies above a cross thread (8) of the second group.
  • the transverse threads 7, 8 of both groups have a rectangular, flattened cross section.
  • the longitudinal threads (6) float first over two transverse threads (7) of the first group on the paper side, then between three transverse threads (7, 8) of the first and the second group and then tie in with a transverse thread (8) of the second group.
  • the transverse threads (7) of the first group Due to their flattened cross-section, the transverse threads (7) of the first group form transverse plateaus for the support of the paper fibers, which are mainly oriented in the running direction of the forming fabric (5). Compared to circular transverse threads of the same cross-sectional area, the transverse threads (7) of the first group have a lower height, which results in flatter crankings for the longitudinal threads (6). This reduces the risk of wire markings and ensures better length constancy of the forming wire (5) on the paper machine.
  • transverse threads (8) of the second group Their abrasion properties correspond to the transverse threads (4) in the embodiment according to Figures (1) and (2).
  • a forming wire (9) is shown, which is formed in three layers. It has paper-side longitudinal threads (10 ⁇ ) that bind in plain weave with a first group of transverse threads (11). Both the longitudinal threads (10 ⁇ ) and the transverse threads (11) have a circular cross-section. Below the paper-side longitudinal threads (10 ⁇ ) machine-side longitudinal threads (12) also have a round cross-section. You bind with a second group of transverse threads (13), which run on the machine side and thereby protect the longitudinal threads (10 ⁇ , 12) against wear. The transverse threads of the second group (13) have a rectangular cross section. Their cross-sectional area is larger than that of the transverse threads (11) of the first group.
  • the ratio of the number of transverse threads (11) in the first group to that of the transverse threads (13) in the second group is 2: 1.
  • the use of flattened cross-sectional shapes reduces the thickness of the forming screen (9) compared to embodiments with round cross-sections of the same cross-sectional area.
  • FIG. 5 shows a two-layer forming fabric (14), which has a first group of transverse threads in the upper layer, normal transverse threads (15) alternating with filling transverse threads (16) in this group. They each have a circular cross-section.
  • the lower, machine-side layer is formed by a second group of long floating cross threads (17) with a rectangular cross-section.
  • Both groups of transverse threads (15, 16, 17) are bound in by longitudinal threads (18), each of which floats on the paper side via two normal transverse threads (15) and a filling transverse thread (16) and each incorporates a transverse thread (17) from the second group on the machine side.
  • Each Adjacent longitudinal threads (18) are offset by three transverse threads (15, 16) of the first group in the machine direction.
  • the forming screen (19) shown in Figure (6) is similar in structure to the forming screen (14) according to Figure (5). It is accordingly constructed in two layers and has alternating normal transverse threads (20 ⁇ ) and filling transverse threads (21), which form the first group of transverse threads running on the paper side. Both have a flattened rectangular cross section.
  • the lower layer is formed by a second group of transverse threads (22), which in this case have a circular cross-section and are integrated on the machine side with a long float.
  • the longitudinal threads (23) float in the same way as in the exemplary embodiment according to FIG. (5).
  • the rectangular cross sections of the normal and filling transverse threads 20, 21, 21 ensure in the exemplary embodiment according to FIG (6) an improved fiber support, in particular when these transverse threads (20 ⁇ , 21) dominate on the paper side and produce a transverse rib structure there.
  • the possibilities of design optimization depending on the requirements in the paper machine in question are shown here in particular.
  • the flattened cross-sections have a freely selectable parameter more than round cross-sections, which increases the design options taking into account the diverse requirements that are currently placed on a forming fabric.
  • the exemplary embodiment shown in FIG. (7) is also a two-layer forming fabric (24), but without filler cross threads.
  • a first group of cross threads (25) with round cross-section forms the upper layer.
  • the lower layer is formed by a second group of transverse threads (26) which have a rectangular cross section and are integrated in a long float.
  • Longitudinal threads (27) extend in the machine direction, float on the paper side each over two transverse threads (25) of the first group and incorporate one transverse thread (26) of the second group on the machine side.
  • Adjacent longitudinal threads (27) are each offset by three transverse threads (25) of the first group in the machine direction.
  • Figure (8) shows in cross section two adjacent transverse threads (28, 29) with a round cross section and each below two adjacent transverse threads (30 ⁇ , 31) with a rectangular cross section.
  • the round cross threads (28, 29) and the rectangular cross threads (30 ⁇ , 31) have the same horizontal dimensions and matching cross-sectional areas.
  • the minimum distances between the round cross threads (28, 29) correspond to the distances of the rectangular cross sections (30 ⁇ , 31).
  • Paper fibers (32, 33) are supported on the round transverse threads (28, 29). They are oriented in the machine direction due to the difference in speed between the fiber headbox and the paper machine wire.
  • the support is unsatisfactory because there is a tendency that the pulp fibers (32, 33) are drawn in by the dewatering stream and also the negative pressure into the upwardly conically opening gap between the round transverse threads (28, 29). This creates problems with dewatering and due to the interlocking effect in the later sheet removal.
  • Paper fibers (34, 35) are also deposited on the rectangular transverse threads (30 ⁇ , 31). Although the gap between the rectangular cross threads (30 ⁇ , 31) is the same size as between the round cross threads (28, 29), it is clear that the support of the pulp fibers (34, 35) is significantly improved. The paper fibers (34, 35) are no longer drawn into the gap between the transverse threads (30 ⁇ , 31), so they do not interfere with the drainage. There is also no interlocking with the transverse threads (30 ⁇ , 31), which could impair the sheet removal.
  • the definition of the fiber support width (FIBER SUPPORT WIDTH) can be explained with reference to FIG. It results when 10 ⁇ % of the height of the threads is removed from the top of the threads.
  • the fiber support width corresponds to the width of these cross threads (30 ⁇ , 31).
  • the fiber support width - each indicated by the length of the arrows - is considerably smaller than the diameter of the cross threads (28, 29) and thus also the fiber support width of the rectangular cross threads (30 ⁇ , 31).

Landscapes

  • Paper (AREA)
  • Materials For Medical Uses (AREA)
  • Undergarments, Swaddling Clothes, Handkerchiefs Or Underwear Materials (AREA)
  • Liquid Crystal (AREA)
  • User Interface Of Digital Computer (AREA)
  • Sheet Holders (AREA)
  • Optical Communication System (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Prostheses (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Magnetic Heads (AREA)
  • Resistance Heating (AREA)
  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
  • Saccharide Compounds (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Woven Fabrics (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Claims (33)

  1. Toile de mise en forme (1) pour la partie de transformation en feuille d'une machine à papier, constituée d'un tissu notamment tissé plat à plus d'une couche de fils synthétiques avec des fils longitudinaux (2) s'étendant dans le sens machine et des fils transversaux (3, 4) s'étendant en direction transversale, un premier groupe de fils transversaux (3) se trouvant dans le plan du côté papier et y flottant sur des fils longitudinaux (2) dont le nombre est au moins égal au nombre de fils transversaux (3) sur lesquels les fils longitudinaux (2) flottent du côté papier, et le plan du côté machine étant exclusivement formé par un deuxième groupe de fils transversaux (4),
    caractérisée par les caractéristiques suivantes :
    a) les fils transversaux possèdent, pour au moins une partie d'entre eux (4, 7, 8, 13, 17, 20, 21, 26, 30, 31), une section aplatie,
    b) les fils transversaux aplatis (4, 7, 8, 13, 17, 20, 21, 26, 30, 31) sont disposés de telle sorte que leur dimension de section dans le plan du tissu est plus grande que leur dimension de section transversalement au plan du tissu,
    c) le rapport entre la dimension de section dans le plan du tissu et la dimension de section transversalement au plan du tissu se situe entre 1, 2 et 2,2, de préférence entre 1,2 et 1, 8.
  2. Toile de mise en forme selon la revendication 1, caractérisée en ce que des fils transversaux aplatis (7, 20 21) font partie du premier groupe de fils transversaux (7, 20, 21).
  3. Toile de mise en forme selon la revendication 2, caractérisée en ce que tous les fils transversaux (7, 20, 21 du premier groupe sont aplatis.
  4. Toile de mise en forme selon la revendication 2 ou 3, caractérisée en ce que le premier groupe de fils transversaux est constitué d'au moins deux sous-groupes de fils transversaux, dont un premier sous-groupe est constitué de fils transversaux normaux (15, 20) et un deuxième sous-groupe de fils transversaux de remplissage (16, 21).
  5. Toile de mise en forme selon la revendication 4, caractérisée en ce que les fils transversaux de remplissage (16, 21) possèdent des flottages qui s'étendent sur plus de fils longitudinaux (23) que les plus longs flottages des fils transversaux normaux (15, 20).
  6. Toile de mise en forme selon la revendication 4 ou 5, caractérisée en ce que les fils transversaux normaux (15, 20) et les fils transversaux de remplissage (16, 21) possèdent des superficies de section et/ou des formes de section respectives différentes.
  7. Toile de mise en forme selon une des revendications 2 à 6, caractérisée en ce que les fils transversaux (3, 7, 11, 15, 16, 20, 21, 25) du premier groupe flottent sur un nombre de fils longitudinaux (2, 6, 12, 18, 23, 27) qui est supérieur au nombre de fils transversaux (3, 7, 11, 15, 16, 20, 21, 25) sur lesquels flottent les fils longitudinaux (2, 6, 12, 18, 23, 27).
  8. Toile de mise en forme selon une des revendications 2 à 7, caractérisée en ce que, pour un tissu à une couche et demie, les fils transversaux (3) du premier groupe flottent, par leurs flottages les plus longs, sur au moins quatre fils longitudinaux (2).
  9. Toile de mise en forme selon une des revendications 2 à 7, caractérisée en ce que, pour un tissu à deux couches, les fils transversaux (6, 15, 16, 20, 21, 25) du premier groupe flottent, par leurs flottages les plus longs, sur au moins trois fils longitudinaux (6, 18, 23, 27).
  10. Toile de mise en forme selon une des revendications 2 à 7, caractérisée en ce que, pour un tissu à trois couches, les fils transversaux (11) du premier groupe s'étendent sur au moins un fil longitudinal (12).
  11. Toile de mise en forme selon une des revendications 2 à 8, caractérisée en ce que les fils transversaux aplatis (7, 20, 21) du premier groupe possèdent une largeur de soutien des fibres qui est supérieure d'au moins 9% à celle d'un fil circulaire de même superficie de section.
  12. Toile de mise en forme selon une des revendications 2 à 11, caractérisée en ce que le degré de recouvrement des fils transversaux (3, 7, 25) du premier groupe est d'au moins 32% pour des tissus à une couche et demie et à deux couches sans fils transversaux de remplissage.
  13. Toile de mise en forme selon une des revendications 2 à 11, caractérisée en ce que le degré de recouvrement des fils transversaux (11, 15, 16, 20, 21) du premier groupe est d'au moins 40% pour des tissus qui sont à deux couches avec des fils transversaux de remplissage (16, 21), ou qui sont à au moins trois couches.
  14. Toile de mise en forme selon une des revendications 1 à 13, caractérisée en ce que des fils transversaux (4, 8, 13, 17, 26) du deuxième groupe sont aplatis.
  15. Toile de mise en forme selon la revendication 14, caractérisée en ce que tous les fils transversaux (4, 8, 13, 17, 26) du deuxième groupe sont aplatis.
  16. Toile de mise en forme selon la revendication 14 ou 15, caractérisée en ce que, pour un tissu à une couche et demie, les fils transversaux (4) du deuxième groupe flottent sur au moins quatre fils longitudinaux (2).
  17. Toile de mise en forme selon la revendication 14 ou 15, caractérisée en ce que, pour un tissu à deux couches, les fils transversaux (8, 17, 22, 26) du deuxième groupe flottent sur au moins cinq fils longitudinaux (6, 18, 23, 27).
  18. Toile de mise en forme selon la revendication 17, caractérisée en ce que, pour un tissu à deux couches, les fils transversaux (17, 22, 26) du deuxième groupe flottent, s'ils sont de taille quatorze, sur au moins dix fils longitudinaux (18, 23), et sur au moins douze fils longitudinaux (27) s'ils sont de taille seize.
  19. Toile de mise en forme selon une des revendications 14 à 17, caractérisée en ce que, pour un tissu à trois couches, les fils transversaux du deuxième groupe flottent sur des fils longitudinaux dont le nombre par flottage est inférieur de 1 à la taille de ces fils transversaux.
  20. Toile de mise en forme selon une des revendications 14 à 19, caractérisée en ce que, pour les fils transversaux aplatis (4, 8, 13, 17, 26) du deuxième groupe, le rapport de la surface d'abrasion maximale à la surface d'abrasion standard est au maximum de 2, 9.
  21. Toile de mise en forme selon une des revendications 14 à 20, caractérisée en ce que le degré de recouvrement des fils transversaux (4) du deuxième groupe est supérieur à 52% pour un tissu à une couche et demie.
  22. Toile de mise en forme selon une des revendications 14 à 20, caractérisée en ce que le degré de recouvrement des fils transversaux (8, 17, 22, 26) du deuxième groupe est supérieur à 40% pour un tissu à deux couches sans fils transversaux de remplissage dans le premier groupe, et à 32% avec des fils transversaux de remplissage (16, 21) dans le premier groupe.
  23. Toile de mise en forme selon une des revendications 14 à 20, caractérisée en ce que le degré de recouvrement des fils transversaux (13) du deuxième groupe est supérieur à 45% pour un tissu à trois couches dans lequel le rapport du nombre de fils transversaux du premier groupe au nombre de fils transversaux du deuxième groupe est de 1:1, est supérieur à 42% pour un tissu à trois couches dans lequel le rapport du nombre de fils transversaux du premier groupe au nombre de fils transversaux du deuxième groupe est de 3:2, et est supérieur à 39% pour un tissu à trois couches dans lequel le rapport du nombre de fils transversaux (11) du premier groupe au nombre de fils transversaux (13) du deuxième groupe est de 2:1.
  24. Toile de mise en forme selon une des revendications 1 à 23, caractérisée en ce que les fils longitudinaux possèdent, pour au moins une partie d'entre eux, une section aplatie, les fils longitudinaux aplatis étant disposés de telle sorte que leur dimension de section dans le plan du tissu est plus grande que leur dimension de section transversalement au plan du tissu, et que le rapport entre la dimension de section dans le plan du tissu et la dimension de section transversalement au plan du tissu se situe entre 1, 2 et 2,2.
  25. Toile de mise en forme selon la revendication 24, caractérisée en ce que tous les fils longitudinaux sont aplatis.
  26. Toile de mise en forme selon la revendication 25, caractérisée en ce que les fils longitudinaux aplatis possèdent une superficie de 0,15 à 0,226 mm2.
  27. Toile de mise en forme selon une des revendications 1 à 25, caractérisée en ce que les fils transversaux aplatis (7, 20, 21) du premier groupe possèdent une superficie de 0,013 à 0, 195 mm2.
  28. Toile de mise en forme selon une des revendications 1 à 27, caractérisée en ce que les fils transversaux aplatis (4, 8, 13, 17, 22, 26) du deuxième groupe possèdent une superficie de 0,022 à 0,4 mm2.
  29. Toile de mise en forme selon une des revendications 1 à 28, caractérisée en ce que les fils aplatis (4, 7, 8, 13, 17, 20, 21, 26) possèdent une section ovale ou rectangulaire.
  30. Toile de mise en forme selon une des revendications 1 à 29, caractérisée en ce que le volume intérieur ouvert du tissu est inférieur à 54 mm3/cm2, et de préférence à 46 mm3/cm2.
  31. Toile de mise en forme selon la revendication 30, caractérisée en ce que le volume intérieur ouvert du tissu est
    a) inférieur à 55 mm3/cm2, et de préférence à 46 mm3/cm2, pour un tissu à une couche et demie,
    b) inférieur à 38 mm3/cm2, et de préférence à 33 mm3/cm2, pour un tissu à deux couches,
    c) inférieur à 53 mm3/cm2, et de préférence à 44 mm3/cm2, pour un tissu à deux couches avec un premier groupe de fils transversaux constitué de fils transversaux normaux et de fils transversaux de remplissage,
    d) pour un tissu à trois couches
    aa) inférieur à 60 mm3/cm2, et de préférence à 55 mm3/cm2, pour un tissu avec un rapport du nombre de fils du premier au deuxième groupe de fils transversaux de 2:1,
    ab) inférieur à 40 mm3/cm2, et de préférence à 38 mm3/cm2, pour un tissu avec un rapport du nombre de fils du premier au deuxième groupe de fils transversaux de 1:1.
  32. Toile de mise en forme selon une des revendications 1 à 31, caractérisée en ce que le tissu est à au moins trois couches et les couches sont mutuellement reliées par des fils de liage, les fils de liage possédant eux aussi une section aplatie avec une dimension de section dans le plan du tissu qui est plus grande que la dimension de section transversalement à ce plan.
  33. Toile de mise en forme selon la revendication 32, caractérisée en ce que la superficie de section des fils de liage se situe entre 0,012 et 0,062 mm2.
EP93919118A 1992-08-25 1993-08-20 Toile de mise en forme Expired - Lifetime EP0656967B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9211391U DE9211391U1 (de) 1992-08-25 1992-08-25 Formiersieb
DE9211391U 1992-08-25
PCT/EP1993/002234 WO1994004748A1 (fr) 1992-08-25 1993-08-20 Toile de mise en forme

Publications (2)

Publication Number Publication Date
EP0656967A1 EP0656967A1 (fr) 1995-06-14
EP0656967B1 true EP0656967B1 (fr) 1996-10-30

Family

ID=6883020

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93919118A Expired - Lifetime EP0656967B1 (fr) 1992-08-25 1993-08-20 Toile de mise en forme

Country Status (11)

Country Link
US (1) US5613527A (fr)
EP (1) EP0656967B1 (fr)
AT (1) ATE144804T1 (fr)
BR (1) BR9306955A (fr)
CA (1) CA2142283C (fr)
DE (2) DE9211391U1 (fr)
DK (1) DK0656967T3 (fr)
ES (1) ES2094563T3 (fr)
FI (1) FI97156C (fr)
NO (1) NO305091B1 (fr)
WO (1) WO1994004748A1 (fr)

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DE9211776U1 (de) * 1992-09-02 1992-11-12 Württembergische Filztuchfabrik D. Geschmay GmbH, 7320 Göppingen Trockensieb
GB9609761D0 (en) * 1996-05-10 1996-07-17 Jwi Ltd Low air permeability papermaking fabric including flattened secondary weft yarns and pin seam
US5799708A (en) * 1996-10-11 1998-09-01 Albany International Corp. Papermaker's fabric having paired identical machine-direction yarns weaving as one
US6179013B1 (en) * 1999-10-21 2001-01-30 Weavexx Corporation Low caliper multi-layer forming fabrics with machine side cross machine direction yarns having a flattened cross section
US7331944B2 (en) * 2000-10-23 2008-02-19 Medical Instill Technologies, Inc. Ophthalmic dispenser and associated method
JP4261341B2 (ja) * 2001-07-05 2009-04-30 アステンジョンソン・インコーポレーテッド 糸アセンブリを含む工業用ファブリック
US20030208886A1 (en) * 2002-05-09 2003-11-13 Jean-Louis Monnerie Fabric comprising shaped conductive monofilament used in the production of non-woven fabrics
BRPI0317333B1 (pt) * 2002-12-16 2016-11-08 Albany Int Corp combinação de um tecido de suporte para um processo de hidro-emaranhamento com um dispositivo de hidro-emaranhamento
US6835284B2 (en) * 2002-12-30 2004-12-28 Albany International Corp. Monofilament low caliper one-and-a-half layer seamed press fabric
US6902652B2 (en) * 2003-05-09 2005-06-07 Albany International Corp. Multi-layer papermaker's fabrics with packing yarns
DE102004035519A1 (de) * 2004-07-22 2006-02-09 Voith Fabrics Patent Gmbh Papiermaschinenbespannung
DE102004035522A1 (de) * 2004-07-22 2006-03-16 Voith Fabrics Patent Gmbh Papiermaschinenbespannung
DE102004035523A1 (de) * 2004-07-22 2006-02-09 Voith Fabrics Patent Gmbh Papiermaschinenbespannung
US7721769B2 (en) * 2007-01-19 2010-05-25 Voith Patent Gmbh Paper machine fabric with trapezoidal shaped filaments
US7581569B2 (en) * 2007-03-27 2009-09-01 Lumsden Corporation Screen for a vibratory separator having wear reduction feature
DE202014001502U1 (de) * 2013-03-01 2014-03-21 Voith Patent Gmbh Gewobenes Sieb mit flachen Kettfäden

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Also Published As

Publication number Publication date
US5613527A (en) 1997-03-25
ES2094563T3 (es) 1997-01-16
CA2142283C (fr) 2004-08-17
DE59304370D1 (de) 1996-12-05
NO305091B1 (no) 1999-03-29
NO950703D0 (no) 1995-02-24
CA2142283A1 (fr) 1994-03-03
BR9306955A (pt) 1999-01-12
DK0656967T3 (da) 1997-01-13
ATE144804T1 (de) 1996-11-15
DE9211391U1 (de) 1992-10-29
FI950813A0 (fi) 1995-02-22
EP0656967A1 (fr) 1995-06-14
FI97156B (fi) 1996-07-15
NO950703L (no) 1995-02-24
FI97156C (fi) 1996-10-25
FI950813A (fi) 1995-02-22
WO1994004748A1 (fr) 1994-03-03

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