EP0672784B1 - Papermakers marking felt - Google Patents

Papermakers marking felt Download PDF

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Publication number
EP0672784B1
EP0672784B1 EP19950300727 EP95300727A EP0672784B1 EP 0672784 B1 EP0672784 B1 EP 0672784B1 EP 19950300727 EP19950300727 EP 19950300727 EP 95300727 A EP95300727 A EP 95300727A EP 0672784 B1 EP0672784 B1 EP 0672784B1
Authority
EP
European Patent Office
Prior art keywords
felt
marking
papermakers
marking felt
needled
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
EP19950300727
Other languages
German (de)
French (fr)
Other versions
EP0672784A1 (en
Inventor
Paul Sudre
Jean-Pierre Lalue
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.)
Voith Fabrics Heidenheim GmbH and Co KG
Original Assignee
Scapa Group Ltd
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 Scapa Group Ltd filed Critical Scapa Group Ltd
Publication of EP0672784A1 publication Critical patent/EP0672784A1/en
Application granted granted Critical
Publication of EP0672784B1 publication Critical patent/EP0672784B1/en
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
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts

Definitions

  • the present invention relates to a papermakers marking felt.
  • Marking felts are used in the manufacture of various grades of paper which require a distinctive pattern embossed thereon.
  • the most common area of application is in the manufacture of writing paper, envelopes, and other such stationery.
  • the most commonly used form of marking felt is made entirely from wool.
  • a papermakers marking felt comprising two woven base cloths and one or more additional layers, needled to the base cloths so as to bond the two base cloths together.
  • the marking felts of the present invention have a far greater working life than conventional woollen felts.
  • the quality and intensity of the marking by the felt remains more regular over long periods of usage than known felts.
  • a further advantage is the consistent reproducibility of marking of similar felts which have only minor dimensional variation unlike woollen felts which exhibit significant dimensional variation.
  • the marking felts of the invention allow for water drainage for a paper web, whereas woollen felts do not.
  • the two woven base cloths have different weave patterns.
  • the non-correspondence of the weave patterns i.e. the fact that the two weave patterns are out of phase creates an irregular array of bumps distributed over a sufficiently wide area such that no repetitive pattern can be distinguished by the naked eye.
  • the woven base cloths preferably comprise synthetic fibres, for example monofilaments, cabled monofilaments, multi-filaments or any spun fibres in general.
  • the needled layer or layers may be provided on one or both faces of the marking felt.
  • a papermakers marking felt 10 comprises an upper base cloth 11, a lower base cloth 12 and a further layer 13 needled to the two base layers 11, 12.
  • Felt 10 comprises upper and lower base cloths woven from cabled PA 6.6 yarn, needled on both sides with 22 dtex PA6 staple, giving a unit weight of 1320 g/m 2 ⁇ 8% and a permeability of 64 cfm ⁇ 10%.
  • Figs. 2 and 3 show the impression left on paper during the manufacture thereof using solely the base cloths 11 and 12 respectively.
  • Fig. 4 shows the impression left on paper during the manufacture thereof using the felt 10.
  • Fig. 5 shows a seamed papermakers marking felt 20 of similar construction to that shown in Fig. 1.
  • Felt 20 comprises a lower base cloth woven from monofilament yarns and an upper base cloth woven from multifilament warp and monofilament weft yarns. The base cloths are needled on both sides with 22 dtex PA6 staple giving a unit weight of 1380 g/m 2 ⁇ 8% and a permeability of 60 cfm ⁇ 10%.
  • Figs. 6 and 7 show the impression left on paper during manufacture thereof using solely the upper and lower base cloths of the felt respectively.
  • Fig. 8 shows the impression left on paper during the manufacture thereof using the felt 20.

Description

  • The present invention relates to a papermakers marking felt.
  • Marking felts are used in the manufacture of various grades of paper which require a distinctive pattern embossed thereon. The most common area of application is in the manufacture of writing paper, envelopes, and other such stationery. The most commonly used form of marking felt is made entirely from wool.
  • It is an object of the present invention to provide superior marking felts to conventional woollen felts.
  • According to the present invention there is provided a papermakers marking felt comprising two woven base cloths and one or more additional layers, needled to the base cloths so as to bond the two base cloths together.
  • The marking felts of the present invention have a far greater working life than conventional woollen felts. The quality and intensity of the marking by the felt remains more regular over long periods of usage than known felts. A further advantage is the consistent reproducibility of marking of similar felts which have only minor dimensional variation unlike woollen felts which exhibit significant dimensional variation. Furthermore, the marking felts of the invention allow for water drainage for a paper web, whereas woollen felts do not.
  • Ideally the two woven base cloths have different weave patterns. In such circumstances the non-correspondence of the weave patterns, i.e. the fact that the two weave patterns are out of phase creates an irregular array of bumps distributed over a sufficiently wide area such that no repetitive pattern can be distinguished by the naked eye.
  • The woven base cloths preferably comprise synthetic fibres, for example monofilaments, cabled monofilaments, multi-filaments or any spun fibres in general.
  • The needled layer or layers may be provided on one or both faces of the marking felt.
  • In order that the present invention may be more readily understood specific embodiments thereof will now be described by way of example only with reference to the accompanying drawings in which:-
  • Fig.1 shows side elevations of the two base cloths of a marking felt in accordance with the invention and a plan view of the needled layer;
  • Fig.2 shows a pattern provided in paper made by using the upper base cloth alone of the felt shown in Fig.1;
  • Fig.3 shows a pattern provided in paper made by using the lower base cloth alone of the felt shown in Fig. 1;
  • Fig.4 shows a pattern provided in paper made by using the marking felt of Fig.1;
  • Fig.5 shows side elevations of the two base cloths of a second marking felt in accordance with the invention and a plan view of the needled layer;
  • Fig.6 shows a pattern provided in paper made by using the upper base cloth alone of the felt shown in Fig.5;
  • Fig.7 shows a pattern provided in paper made by using the lower base cloth alone of the felt shown in Fig.5; and
  • Fig. 8 shows a pattern provided in paper made by using the marking felt of Fig. 5.
  • Referring to Fig. 1 a papermakers marking felt 10 comprises an upper base cloth 11, a lower base cloth 12 and a further layer 13 needled to the two base layers 11, 12. Felt 10 comprises upper and lower base cloths woven from cabled PA 6.6 yarn, needled on both sides with 22 dtex PA6 staple, giving a unit weight of 1320 g/m2 ± 8% and a permeability of 64 cfm ± 10%.
  • Figs. 2 and 3 show the impression left on paper during the manufacture thereof using solely the base cloths 11 and 12 respectively. Fig. 4 shows the impression left on paper during the manufacture thereof using the felt 10.
  • Fig. 5 shows a seamed papermakers marking felt 20 of similar construction to that shown in Fig. 1. Felt 20 comprises a lower base cloth woven from monofilament yarns and an upper base cloth woven from multifilament warp and monofilament weft yarns. The base cloths are needled on both sides with 22 dtex PA6 staple giving a unit weight of 1380 g/m2 ± 8% and a permeability of 60 cfm ± 10%.
  • Figs. 6 and 7 show the impression left on paper during manufacture thereof using solely the upper and lower base cloths of the felt respectively. Fig. 8 shows the impression left on paper during the manufacture thereof using the felt 20.

Claims (5)

  1. A papermakers marking felt (10, 20) comprising two woven base cloths (11, 12) and one or more additional layers (13), needled to the base cloths (11, 12) so as to bond the two base cloths (11, 12) together.
  2. A papermakers marking felt (20) as claimed in claim 1, characterised in that the two base cloths (11, 12) have different weave patterns.
  3. A papermakers marking felt as claimed in claim 1 or claim 2, characterised in that an additional layer (13) is needled to one face of the marking felt (10, 20).
  4. A papermakers marking felt as claimed in claim 1 or claim 2, characterised in that additional layers (13) are needled to both faces of the marking felt (10, 20).
  5. A papermakers marking felt as claimed in any preceding claim, characterised in that the woven base cloth (11, 12) comprises any of the following: monofilaments, cabled monofiiaments, multi-filaments or spun fibres.
EP19950300727 1994-03-10 1995-02-06 Papermakers marking felt Expired - Lifetime EP0672784B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9405187 1994-03-10
GB9405187A GB2287257A (en) 1994-03-10 1994-03-10 Papermakers marking felt

Publications (2)

Publication Number Publication Date
EP0672784A1 EP0672784A1 (en) 1995-09-20
EP0672784B1 true EP0672784B1 (en) 2000-09-13

Family

ID=10751980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950300727 Expired - Lifetime EP0672784B1 (en) 1994-03-10 1995-02-06 Papermakers marking felt

Country Status (3)

Country Link
EP (1) EP0672784B1 (en)
DE (1) DE69518776T2 (en)
GB (1) GB2287257A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6610173B1 (en) 2000-11-03 2003-08-26 Kimberly-Clark Worldwide, Inc. Three-dimensional tissue and methods for making the same
DE102020121627A1 (en) 2020-08-18 2022-02-24 Voith Patent Gmbh press felt

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2437303A1 (en) * 1974-08-02 1976-02-12 Marx Gmbh J J Paper making wet felt - made of several superposed woven mesh fabrics coated with matted fibre layers
US4283454A (en) * 1980-02-08 1981-08-11 Porritts & Spencer Inc. Papermakers wet felt with ribbed and smooth surface textures
JPS57176295A (en) * 1981-04-23 1982-10-29 Ichikawa Woolen Textile Papermaking needle felt and method
JPS5887392A (en) * 1981-10-08 1983-05-25 日本フエルト株式会社 Papermaking felt and production thereof
US4503113A (en) * 1982-03-12 1985-03-05 Huyck Corporation Papermaker felt with a three-layered base fabric
FI72767B (en) * 1985-11-01 1987-03-31 Tamfelt Oy Ab FOERFARANDE FOER TILLVERKNING AV EN PRESSFILT OCH EN PRESSFILT.
DE3915909A1 (en) * 1989-05-16 1990-11-22 Marx Gmbh J J FELT CLOTH FOR PAPER MACHINES
US5277967A (en) * 1991-11-21 1994-01-11 Huyck Licensco, Inc. Multilayer fabrics

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6610173B1 (en) 2000-11-03 2003-08-26 Kimberly-Clark Worldwide, Inc. Three-dimensional tissue and methods for making the same
DE102020121627A1 (en) 2020-08-18 2022-02-24 Voith Patent Gmbh press felt
WO2022037832A1 (en) 2020-08-18 2022-02-24 Voith Patent Gmbh Press felt

Also Published As

Publication number Publication date
GB2287257A (en) 1995-09-13
EP0672784A1 (en) 1995-09-20
DE69518776T2 (en) 2001-04-12
GB9405187D0 (en) 1994-04-27
DE69518776D1 (en) 2000-10-19

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