EP0325167B1 - Doppellagige Bespannung für den Blattbildungsbereich einer Papiermaschine - Google Patents

Doppellagige Bespannung für den Blattbildungsbereich einer Papiermaschine Download PDF

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Publication number
EP0325167B1
EP0325167B1 EP89100521A EP89100521A EP0325167B1 EP 0325167 B1 EP0325167 B1 EP 0325167B1 EP 89100521 A EP89100521 A EP 89100521A EP 89100521 A EP89100521 A EP 89100521A EP 0325167 B1 EP0325167 B1 EP 0325167B1
Authority
EP
European Patent Office
Prior art keywords
threads
transverse
layer
thread
double
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
EP89100521A
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German (de)
English (en)
French (fr)
Other versions
EP0325167A1 (de
Inventor
Georg Dipl.-Ing. Borel
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.)
Herman Wangner GmbH and Co KG
Original Assignee
Herman Wangner GmbH and Co KG
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 Herman Wangner GmbH and Co KG filed Critical Herman Wangner GmbH and Co KG
Priority to AT89100521T priority Critical patent/ATE72590T1/de
Publication of EP0325167A1 publication Critical patent/EP0325167A1/de
Application granted granted Critical
Publication of EP0325167B1 publication Critical patent/EP0325167B1/de
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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/903—Paper forming member, e.g. fourdrinier, sheet forming member

Definitions

  • the invention is based on a double-layer covering for the sheet formation area of a paper machine with two layers of transverse threads which are interwoven with a single system of longitudinal threads.
  • Double-layer screens brought a significant improvement in sheet formation properties compared to single-layer screens.
  • the high degree of filling of the longitudinal threads of 95 - 110% has significantly improved the longitudinal stability.
  • the drainage properties of these screens are also more favorable because there are no large meshes running through in the vertical direction and the water is drained from the pulp through numerous fine, slit-like meshes, which are predominantly arranged in the oblique direction.
  • a two-layer sieve is a covering for the sheet formation area of a paper machine, which consists of an upper sieve and a lower sieve, both of which are complete woven fabrics of longitudinal threads and transverse threads, the upper sieve and the lower sieve either by means of special binding threads or by weaving in the Longitudinal or transverse threads of the top wire are connected to the bottom wire or vice versa.
  • the top sieve is fine-meshed. It consists of many thin threads and is not very stable in itself.
  • the bottom wire is coarse and consists of thick threads. It gives the fabric the required longitudinal and transverse stability.
  • the binding threads can run in the longitudinal direction, in the transverse direction or simultaneously in both directions.
  • the weak point of these two-layer screens is the binding thread. It is often destroyed prematurely by wear on the barrel side or by the internal friction between the two fabric layers. A remedy for this is provided by DE-C-3 329 739.
  • This sieve has transverse threads arranged in pairs on the running side and the binding thread is no longer on the running surface, but is clamped in by a pair of transverse threads and held against the longitudinal thread crossing over it. In the case of two-layer sieves, the connection between the two layers is not strong enough to avoid mutual relative movement. When the screen is alternately deflected over the outside and inside guide rollers, there is an internal friction between the two fabric layers.
  • the abrasive particles of the filler get through the high proportion of fillers in writing and printing papers between the two fabric layers. Due to the relative movement and the filler, the surface between the two layers of fabric is also heavily ground down. The binding threads at the points of contact with the fabric layers are often worn through early. As a result, the fabric layers separate and the sieve becomes unusable.
  • EP-A-0 224 276 describes a sieve which is similar to the double-layer sieve, but has the finer surface structure of a two-layer sieve.
  • the paper-side structure is very finely designed by a special longitudinal thread guide and by double the number of transverse threads. In contrast, the running side of this sieve is rough and very open.
  • Successive cross threads on the paper side are also supported in different ways by carrying a cross thread saddle-shaped from a longitudinal thread so that it lies exactly in the transverse direction in the fabric, while the next cross thread is supported by two adjacent longitudinal threads, one of the longitudinal threads on the screen surface rises and the other descends, so that the support of the transverse thread is scissor-shaped and the transverse thread float is rotated so that it lies at an angle to the floats of the saddle-supported transverse thread.
  • the marking properties of the screen are significantly improved.
  • the number of transverse threads on the paper side is twice as large as on the running side.
  • the marking properties and the retention of the fibers are improved in that an additional supporting thread is inserted without binding in a single-layer or double-layer screen on the paper side after each structural thread. This reduces the mesh size and the fibers of the paper pulp are better supported. For technical reasons of weaving, however, it is not possible to weave in further additional threads if the maximum possible thread density of the double-layer sieve has already been reached. The number of transverse threads in the original weave must be reduced by approximately one third in order to achieve approximately the same total number of transverse threads with additional threads.
  • the longitudinal threads stretch and force the transverse threads to bend.
  • the long transverse thread floatation is formed on the running side, that in the finished sieve protrudes from the fabric plane and forms the abrasion surface of the sieve.
  • the longitudinal thread is pressed into the interior of the fabric by the high longitudinal tension.
  • the transverse threads slide over one another, and it is extremely difficult to weave the fabric in such a way that all the transverse threads lie perfectly over one another over the entire length and width of the sieve.
  • the sieve With a sieve 9 m wide and 70 longitudinal threads / cm, the sieve has a total of 63,000 longitudinal threads. With a cross thread count of 30 cross threads in the top layer and 30 cross threads in the bottom layer / cm, the screen has a total of 135,000 cross thread pairs with a screen length of 45 m. With a 7-thread weave, there are 1215 million cross thread floats, all of which must lie cleanly on top of each other. If there is only a single point where the upper transverse thread slips off the lower one, this point will cause an inadmissible marking of the paper web at the high operating speeds of the sieves and the entire sieve becomes unusable.
  • the polyamide monofilament bends differently under tension and heat than the polyester monofilament. This depends on the temperature and voltage.
  • the longitudinal thread embeds less deep into the fabric when the polyamide thread is tied in than when the polyester thread is tied.
  • the number of transverse threads on the running side is lower in these sieves, and thus the distances between the transverse threads are considerably larger than in double-layered sieves with the same number of transverse threads in the upper and lower layers.
  • hydrodynamic pressure waves emanating from the running side have a decisive influence on the marking
  • the large spacing of the transverse threads on the running side has an adverse effect on the marking.
  • the strength of the pressure waves depends on the distance between successive transverse threads. When using fabrics with only half the number of transverse threads on the running side, it sometimes happens that unacceptably strong transverse thread markings become visible in the paper web.
  • the density of the lines of the marking in the paper web does not correspond to every lower transverse thread, but only to every second transverse thread on the running side; this is the polyamide cross thread.
  • the reasons for this are the differences in the layering (slipping) described above and the differences in the offset between polyamide and polyester. In this way, the otherwise interesting advantages of these screens are sometimes nullified.
  • the invention has for its object to design a double-layer paper machine screen so that the risk of slipping of the upper transverse threads compared to the lower transverse threads is significantly reduced.
  • this object is achieved in that the lower transverse threads are woven in parallel in pairs and a transverse thread of the upper layer is arranged over each pair of transverse threads in the lower layer.
  • a transverse thread of the upper layer can also be arranged between each pair of transverse threads of the lower layer.
  • the paper machine sieve according to the invention is produced in such a way that, with the structural features remaining unchanged, instead of a lower transverse thread, two lower transverse threads each with a diameter of approximately 20% to 30% smaller are woven in.
  • the number of transverse threads in the lower layer is thus doubled compared to the sieves according to EP-A-0 085 363 and EP-A-0 224 276.
  • doubling the number of transverse threads in the lower layer does not result in a reduction in the number of transverse threads in the upper layer .
  • Each pair of cross threads in the lower layer therefore only has the same effect as a single cross thread on the total number of transverse threads that can be achieved.
  • the weaving sequence is such that a lower transverse thread of a pair, then an upper transverse thread and finally the other transverse thread of this pair are woven in.
  • the two transverse threads of the lower layer are therefore not woven in one after the other, but the upper transverse thread is woven in between them.
  • the abrasion resistance is also increased in the paper machine sieve according to the invention, since the total volume of the transverse threads of the lower layer available for the abrasion is higher.
  • the material volume of the lower transverse threads is increased by a total of about 34%. This leads to an improvement in the abrasion resistance and thus an increase in the running time.
  • the diameter of the lower transverse threads is at least equal to that of the upper transverse threads and that it can be up to 30% larger.
  • each pair of transverse threads preferably consists of a polyester thread and a polyamide thread, generally a polyester monofilament and a polyamide monofilament.
  • the thickness of the lower layer is also reduced and at the same time the open area of the lower layer is reduced.
  • the distances between the cross thread pairs also become smaller, which further reduces the risk of marking.
  • the paper machine screen according to the invention and the upper fabric of the multi-layer paper machine screen according to the invention also have the typical features of a double-layer paper machine screen.
  • the upper transverse threads are finer than the lower transverse threads, although the difference is not as pronounced as in the prior art, since in the paper machine screen according to the invention each individual lower transverse thread is thinner than usual.
  • the longitudinal and transverse threads are generally monofilaments.
  • the upper transverse threads and the longitudinal threads are generally polyester monofilaments.
  • the paper machine screen can be flat or endless be woven. In particular in the case of endless weaving, the longitudinal threads can be multifilaments, for example.
  • the paper machine screen according to the invention can be woven in any number of shafts. A seven-year, eight-year, ten-year, fourteen-year or sixteen-year bond is particularly useful.
  • Cross threads woven in pairs are known in single-layer and two-layer or multi-layer paper machine screens. With these paper machine screens, however, there is no risk of displacement of transverse threads arranged vertically one above the other, or such a displacement does not have a serious influence on the marking properties.
  • Multi-layer paper machine screens with cross threads running in pairs in parallel in one of the layers are known from US-A-4,636,426 and DE-C-3,329,739. In the former case, the two transverse threads of a pair are bound together over their entire length by a hydrophilic, water-absorbing polyester, so that the two transverse threads act like a single thread with a flat cross-section.
  • the second case it is a two-ply paper machine screen, in which the transverse threads of the lower layer are guided in pairs in parallel in order to enclose the binding cross thread between them and the crossing longitudinal thread, so that this is largely removed from abrasion.
  • EP-A-0 117 856 describes a two-layer paper machine screen in which the warp threads of the lower layers are woven in pairs in parallel over their entire course. This makes it possible, on the one hand, to produce double-layer paper machine sieves and, on the other hand, two-layer paper machine sieves with warp threads of the same diameter in the same warp thread density.
  • a two-ply paper machine screen is known in which, in order to avoid high tensions in the binding threads, the lower fabric contains two groups of transverse threads, of which the first group in 1: 1 binding and the second group in 1: n weave are interwoven with the warp threads of the lower fabric, successive transverse threads of different types of weave, which form double offsets on the inside of the lower fabric, touch, and wherein the long n-offsets form a plane of wear on the outside.
  • n means an odd number greater than l.
  • the double-layer paper machine screen shown in FIGS. 1 and 4 has upper transverse threads 1 and lower transverse threads 2 and 3 woven in parallel in pairs, which are interwoven with longitudinal threads 4.
  • the upper transverse threads 1 together with the longitudinal threads 4 form the paper side 5 of the paper machine screen, on which the sheet is formed.
  • the lower transverse threads 2 and 3 form the running side 6 of the paper machine screen, with which the paper machine screen faces most of the rollers and the guide elements of the paper machine.
  • the longitudinal threads 4 are generally not involved in the formation of the running side, since they are decisive for the longitudinal stability of the paper machine screen and should therefore be exposed to the abrasion as little as possible. This is achieved in the manufacture of the paper machine screen in that a correspondingly high longitudinal tension is exerted on the paper machine screen during heat setting, so that the lower offsets of the longitudinal threads 4 are pulled upward.
  • the paper machine screen shown in FIGS. 1 and 4 is essentially identical to the paper machine screen according to FIGS. 1 and 2 and example 1 of EP-A-0 224 276 same, but with the exception of the double cross threads 2, 3.
  • the paper machine fabric was produced with the following data, the values after the weaving and heat setting being indicated where relevant:
  • the fabric thickness is 0.716 mm and the free distance between the lower cross threads is 0.405 mm. It can be seen from this that in the paper machine screen according to the invention the lower layer is significantly thinner and is no longer so extremely open.
  • Figure 3 shows an embodiment with a different weave, in which the upper layer of the transverse threads 1 alternately consists of polyester monofilaments of 0.11 and 0.18 mm in diameter.
  • the other design features are unchanged in both the state after weaving and the state after heat setting.
  • Figures 5 and 6 relate to an embodiment in which the double-layer paper machine wire known from Figures 5a and 5b of EP-A-0 245 851 has been modified in accordance with the present invention by each of the transverse threads of the lower layer being replaced by a pair of transverse threads woven in parallel was replaced.
  • the present invention also covers embodiments in which the uppermost fabric 7 of a multi-layer paper machine wire is formed by a fabric which corresponds to one of the double-layer paper machine wires described above (FIG. 7).
  • the upper fabric 7 is connected to the lower fabric 8 in that the one transverse thread 2 of a parallel cross thread pair is interwoven with a longitudinal thread 9 of the lower fabric 8.
  • the structure of the upper fabric 7 is not impaired, since the longitudinal thread 4 of the upper fabric 7 has its normal course due to the other transverse thread 3, which has remained unchanged in the course. This also means that there are no troughs on the paper side 5 at the binding points, which would lead to a noticeable marking in the paper.
  • a double-layer fabric as the lower fabric 8 instead of the single-layer fabric shown in FIG.

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  • Paper (AREA)
  • Woven Fabrics (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP89100521A 1988-01-15 1989-01-13 Doppellagige Bespannung für den Blattbildungsbereich einer Papiermaschine Expired - Lifetime EP0325167B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89100521T ATE72590T1 (de) 1988-01-15 1989-01-13 Doppellagige bespannung fuer den blattbildungsbereich einer papiermaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3801051A DE3801051A1 (de) 1988-01-15 1988-01-15 Doppellagige bespannung fuer den blattbildungsbereich einer papiermaschine
DE3801051 1988-01-15

Publications (2)

Publication Number Publication Date
EP0325167A1 EP0325167A1 (de) 1989-07-26
EP0325167B1 true EP0325167B1 (de) 1992-02-12

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ID=6345363

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89100521A Expired - Lifetime EP0325167B1 (de) 1988-01-15 1989-01-13 Doppellagige Bespannung für den Blattbildungsbereich einer Papiermaschine

Country Status (9)

Country Link
US (1) US4934414A (pt)
EP (1) EP0325167B1 (pt)
JP (1) JPH02133691A (pt)
AT (1) ATE72590T1 (pt)
BR (1) BR8806758A (pt)
CA (1) CA1312530C (pt)
DE (2) DE3801051A1 (pt)
ES (1) ES2029906T3 (pt)
FI (1) FI890169A (pt)

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Also Published As

Publication number Publication date
FI890169A (fi) 1989-07-16
FI890169A0 (fi) 1989-01-13
CA1312530C (en) 1993-01-12
DE58900822D1 (de) 1992-03-26
DE3801051A1 (de) 1989-07-27
BR8806758A (pt) 1989-10-17
EP0325167A1 (de) 1989-07-26
US4934414A (en) 1990-06-19
ATE72590T1 (de) 1992-02-15
ES2029906T3 (es) 1992-10-01
JPH02133691A (ja) 1990-05-22

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