EP0054206B1 - Feutre de séchage pour la section de séchage des machines à papier - Google Patents

Feutre de séchage pour la section de séchage des machines à papier Download PDF

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Publication number
EP0054206B1
EP0054206B1 EP81109962A EP81109962A EP0054206B1 EP 0054206 B1 EP0054206 B1 EP 0054206B1 EP 81109962 A EP81109962 A EP 81109962A EP 81109962 A EP81109962 A EP 81109962A EP 0054206 B1 EP0054206 B1 EP 0054206B1
Authority
EP
European Patent Office
Prior art keywords
threads
dryer
felt
fibres
paper web
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
Application number
EP81109962A
Other languages
German (de)
English (en)
Other versions
EP0054206A1 (fr
Inventor
Giovanni Geschmay
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.)
FELTRIFICIO VENETO SpA
Original Assignee
FELTRIFICIO VENETO SpA
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
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Application filed by FELTRIFICIO VENETO SpA filed Critical FELTRIFICIO VENETO SpA
Priority to AT81109962T priority Critical patent/ATE13322T1/de
Publication of EP0054206A1 publication Critical patent/EP0054206A1/fr
Application granted granted Critical
Publication of EP0054206B1 publication Critical patent/EP0054206B1/fr
Expired 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
    • 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
    • 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
    • D21F1/10—Wire-cloths
    • 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
    • D21F1/10—Wire-cloths
    • D21F1/105—Multi-layer wire-cloths

Definitions

  • the invention relates to a dry felt for the dryer section of paper machines, with threads containing metal fibers which contain, in particular spun, textile fibers, glass fibers or the like in at least some of the warp threads and / or the weft threads in connection with natural and / or artificial or synthetic fibers or are twisted.
  • the dry felts containing metal fibers have a significantly greater heat capacity than the dry felts consisting only of textile fibers and are consequently heated to a significantly greater extent, in particular to such an extent that the residual water evaporated from the paper web does not condense in the dry felt, but instead escapes through it as steam to the outside.
  • the heated, metal fiber-containing dry felt forms a heat source that the paper web from the outside, i. H. heated from the opposite side of the drying cylinders. This significantly increases the drying speed of the paper web and consequently reduces the dwell time of the paper web in the drying section of the paper machine accordingly.
  • the metal fibers are approximately evenly distributed over the thickness or over all the layers of the felt fabric.
  • the heat losses through the external, i.e. H. side of the dry felt facing away from the paper web is relatively large.
  • the entanglement of the metal fibers on the entire thickness or on all thread layers of the dry felt reduces the flexibility of the felt to an undesirably high degree.
  • the object of the invention is to eliminate these disadvantages of the known designs, i. H. in the case of a dry felt containing metal fibers, to reduce the heat losses through the outer side of the dry felt opposite the paper web and to increase the flexibility of the dry felt without impairing the advantages caused by the metal fiber content.
  • the thread layer on the outer side of the dry felt facing away from the paper web contains no metal fibers.
  • this outer metal fiber-free thread layer of the dry felt has a lower thermal conductivity and acts as a heat-insulating layer for the inner, metal fiber-like thread layer coming into contact with the paper web.
  • the heat losses through the outer side of the dry felt are reduced and the desired advantageous heat accumulation in the dry felt is increased accordingly.
  • the good heat-conducting connection to the paper web is ensured by the metal fibers which are in the threads of the inner, i.e. H. the paper web closest to or in contact with the thread layer are contained.
  • the limitation of the metal fibers to the mentioned inner thread layer also increases the flexibility of the dry felt.
  • a design of the dry felt according to the invention in which the metal fibers in the inner, ie. H. are closest to the paper web or come into contact with the thread layer made of stainless steel.
  • the low thermal conductivity of the stainless steel increases the heat storage capacity of the dry felt.
  • the flexibility of the dry felt according to the invention can be increased further in that the metal fibers in the inner, ie. H. the closest to or in contact with the thread layer of short, fine metal fibers.
  • the known dryer section of a paper machine shown in FIG. 2 consists of two superimposed, mutually parallel rows of circumferential, heated drying cylinders A which are offset from one another in a gap.
  • the paper web B arriving from the press section of the paper machine is alternately passed around and passed through the drying cylinders A.
  • the dryer section in the direction of the arrow C.
  • the continuous, smooth contact of the paper web B with the drying cylinders A is ensured by an endless drying felt D which runs in the direction of the arrow F and is guided over deflection rollers and which covers the paper web B in the region of the drying cylinders A.
  • the dry felt D consists of a woven web (drying cloth) with warp threads 6 and weft threads 5.
  • the weft threads 5 are arranged in a manner known per se in three layers S, Si, Se lying on top of one another and are bonded by the warp threads 6, d. H. the course of the warp threads 6 in the dry felt D can be chosen as desired.
  • two different, conventional types of binding are shown in the left and in the right half of the figure. However, the invention is not limited to these two types of binding.
  • the paper web B and the outer surface of a drying cylinder A are also shown schematically in FIG. 2.
  • the warp threads 6 can consist of any material previously used for these threads, in particular natural, artificial and / or synthetic textile material.
  • metal fibers are partially contained in the weft threads 5 according to the invention.
  • These metal fibers can consist of any metal or alloy or of metal fiber mixtures of two or more metals and / or alloys.
  • the metal fibers are preferably made of stainless steel and / or copper.
  • the metal fibers, which are arranged in the weft threads 5 of the weft thread layer S closest to the paper web consist of stainless steel.
  • the metal fibers can be contained in the weft threads 5 in connection with any material previously used for these threads, in particular in connection with natural, artificial and / or synthetic textile fibers or the like.
  • An exemplary embodiment of such a weft thread 5 is shown in FIG.
  • This weft thread can have short, fine metal fibers 7 which, together with short staple or cut fibers 8 made of natural and / or artificial or synthetic material, are spun or twisted into a thread.
  • the weft threads 5 can consist of one or more, long or endless, ie. H. continuous metal fibers in particular consist of one or more, fine metal threads or metal wires, which together with one or more, long or endless, d. H. continuous and optionally pre-spun, natural and / or artificial or synthetic, in particular textile fibers or threads are spun or twisted.
  • FIG. 4 Another exemplary embodiment of a weft thread 5 is shown in FIG. 4.
  • This weft thread has a load-bearing core 9 which, for. B. consists of a monofilament or multifilament plastic yarn or glass thread or the like. And is provided with a winding of metal fibers 7.
  • metal fibers 7 In this case too, short, fine metal fibers or long or endless, ie. H. continuous metal fibers, especially fine metal threads or metal wires are used.
  • the winding of the core 9 in any, known from the so-called core yarns, for. B. by spinning or twisting the thread core 9 with the metal fibers 7.
  • the winding of the thread core 9 consists of approximately parallel or helically twisted, long or endless metal fibers or metal threads 7, which are connected by at least one outer, approximately helically wound connecting thread 10 z. B. from natural and / or artificial or synthetic textile fibers are held together.
  • any thread, yarn and thread types that consist of metal fibers or metal threads or preferably metal fibers or metal threads in connection with any other spinnable or twistable, natural or artificial can be used as weft threads 5 in the dry felt D according to FIG. 2 Contain materials, especially textile fibers.
  • the density of the weft threads 5 in the dry felt D according to FIG. 2 depends, among other things, on the heat gradient which arises in the dry felt D during operation of the dryer section and on the metal fiber content of the weft threads 5.
  • the dry felt D described above has a high degree of vapor permeability, excellent flexibility and a sufficiently fine surface structure so that the best possible, gentle and uniform drying of the paper web B is achieved.
  • the dry felt D acts as a heat store, which absorbs and stores the heat emanating from the drying cylinders A.
  • the dry felt D according to the invention is heated significantly more than the conventional dry felts, in particular to such an extent that the residual water evaporated from the paper web B does not condense in the dry felt D, but instead escapes through the steam as a vapor.
  • the hot dry felt D that heats the paper web B from the outside, i. H. from the side opposite the drying cylinders A.
  • the drying speed of the paper web B is significantly increased and, as a result, the dwell time of the paper web B in the dryer section is correspondingly reduced.
  • the resistance of the dry felt to the usual chemical agents is improved by the metal fibers.
  • the advantage is achieved that the thermal conductivity of the steel fibers is significantly lower than that of the other metal fibers, in particular the copper fibers.
  • the steel fibers or the weft layer S reach a temperature closer to the surface temperature of the drying cylinders A and give off the heat absorbed to the paper web B over longer periods of time, in particular to the paper web side coming into contact with the weft layer S and away from the drying cylinders A.
  • the paper web B to be dried is enclosed to a certain extent between two approximately equally heated surfaces, one of which is also vapor-permeable.

Landscapes

  • Paper (AREA)
  • Woven Fabrics (AREA)

Claims (3)

1. Feutre de séchage pour la section de séchage des machines à papier, fait avec des fils qui contiennent des fibres de métal (7) et qui sont contenus, notamment introduits par filage ou retordage, conjointement à des fibres naturelles et/ou artificielles ou synthétiques, des fibres textiles (8), des fibres de verre (9), ou autres, dans au moins un certain nombre de fils d'ordissage (6) et/ou de fils de trame (5), caractérisé en ce que les fibres de métal (7) se trouvent seulement dans les fils (5) de la couche de fils (S) étant la plus proche du ruban de papier (B) ou entrant en contact avec celui-ci.
2. Feutre de séchage suivant la revendication 1, caractérisé en ce que les fibres de métal (7) sont des fibres d'acier inoxydable.
3. Feutre de séchage suivant les revendications 1 ou 2, caractérisé en ce que les fibres de métal (7) sont des fibres de métal courtes et fines.
EP81109962A 1980-12-15 1981-11-27 Feutre de séchage pour la section de séchage des machines à papier Expired EP0054206B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81109962T ATE13322T1 (de) 1980-12-15 1981-11-27 Trockenfilz fuer die trockenpartie von papiermaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVE1980U61980U IT8061980U1 (it) 1980-12-15 1980-12-15 Telatramata a foggia di nastro per circuiti essiccatori di carta a nastro continuo
IT6198080U 1980-12-15

Publications (2)

Publication Number Publication Date
EP0054206A1 EP0054206A1 (fr) 1982-06-23
EP0054206B1 true EP0054206B1 (fr) 1985-05-15

Family

ID=11293171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109962A Expired EP0054206B1 (fr) 1980-12-15 1981-11-27 Feutre de séchage pour la section de séchage des machines à papier

Country Status (4)

Country Link
EP (1) EP0054206B1 (fr)
AT (1) ATE13322T1 (fr)
DE (1) DE3170548D1 (fr)
IT (1) IT8061980U1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4738752A (en) * 1986-08-12 1988-04-19 Beloit Corporation Heated extended nip press apparatus
ES2015284B3 (es) * 1987-05-14 1990-08-16 Thomas Josef Heimbach Gmbh & Co Pista de material
US5082533A (en) * 1990-04-10 1992-01-21 Beloit Corporation Heated extended nip press with porous roll layers
GB9521190D0 (en) * 1995-10-17 1995-12-20 Scapa Group Plc Papermakers dryer fabric
DE19654434A1 (de) 1996-12-30 1998-07-02 Voith Sulzer Papiermasch Gmbh Maschine zur Herstellung einer kontinuierlichen Materialbahn

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR560947A (fr) * 1923-01-12 1923-10-12 Debouchaud & Cie Nouveau genre de feutres tissés dits : de papeterie
CH238316A (de) * 1943-07-10 1945-07-15 Fink Armin Armiertes Gewebe und Verfahren zu dessen Herstellung.
FR1061571A (fr) * 1951-08-25 1954-04-13 Johnson & Sons Ltd C H Fil composé et toile métallique fabriquée à l'aide de ce fil et utilisable notamment dans les machines à papier
FR1161568A (fr) * 1956-10-22 1958-09-02 Cie Hudson France Perfectionnements aux tamis catalytiques
GB1085098A (en) * 1964-06-23 1967-09-27 Bba Group Ltd Improvements in or relating to yarn and fabric made therefrom
NO139278C (no) * 1967-04-05 1979-01-31 Albany Felt Co Papirmaskinfilt.
FR2438114A3 (fr) * 1978-10-06 1980-04-30 Applic Gaz Sa Element textile et materiau tisse destines notamment a servir de substrat a une matiere catalytique, par exemple de combustion

Also Published As

Publication number Publication date
ATE13322T1 (de) 1985-06-15
DE3170548D1 (en) 1985-06-20
IT8061980V0 (it) 1980-12-15
IT8061980U1 (it) 1982-06-15
EP0054206A1 (fr) 1982-06-23

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