WO2002088464A1 - Toile de fabrication et procede de creation de motifs sur papier - Google Patents

Toile de fabrication et procede de creation de motifs sur papier Download PDF

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Publication number
WO2002088464A1
WO2002088464A1 PCT/GB2002/001720 GB0201720W WO02088464A1 WO 2002088464 A1 WO2002088464 A1 WO 2002088464A1 GB 0201720 W GB0201720 W GB 0201720W WO 02088464 A1 WO02088464 A1 WO 02088464A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
pattern forming
drainage
paper
mesh
Prior art date
Application number
PCT/GB2002/001720
Other languages
English (en)
Inventor
John Edward Rose
Original Assignee
J R Crompton Limited
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
Priority claimed from GB0110616A external-priority patent/GB0110616D0/en
Priority claimed from GB0111680A external-priority patent/GB0111680D0/en
Application filed by J R Crompton Limited filed Critical J R Crompton Limited
Priority to DE60222251T priority Critical patent/DE60222251T2/de
Priority to EP02720212A priority patent/EP1383957B1/fr
Priority to US10/475,564 priority patent/US6998020B2/en
Publication of WO2002088464A1 publication Critical patent/WO2002088464A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper

Definitions

  • the present invention relates to a screen for use in forming a patterned paper, particularly but not exclusively a tissue for manufacture of a beverage infusion package, and also to a method of producing patterned paper.
  • Beverage infusion packages comprise a beverage precursor material (e.g. tea leaves or ground coffee) enclosed within a bag, pouch, sachet or the like (all conveniently referred to herein as a bag) of a paper usually having a basis weight in the range 10 to 30 gm " .
  • the paper is frequently referred to as "tissue” or “tea bag tissue” and is typically formed by a conventional wet-laying technique in which an aqueous suspension of paper forming fibres is laid onto a travelling, water pervious paper-forming screen with water then being drained through the screen to produce the paper.
  • the tissue may be of the heat seal type which incorporates thermoplastic fibres and from which the beverage infusion bag is produced by heat sealing two layers of the tissue together.
  • the tissue may be of the non-heat seal type from which the closure seams(s) of the beverage infusion bag is/are produced by a mechanical, e.g. crimping, action without heat sealing.
  • the tissue be produced with a pattern.
  • Various examples of patterns are used, e.g. the initials and/or logo of the manufacturer of the beverage infusion packages.
  • the pattern may comprise a repeat of small circular or diamond-shaped "dots" that are intended to give the impression of perforations in the tissue.
  • fluid jet-patterning the pattern is formed using fluid jets (usually water) directed at the web whilst it is still on the paper forming screen during the process of manufacture by wet-laying.
  • fluid jets usually water
  • a cylindrical patterning screen rotating about a horizontal axis is provided above the paper forming screen and its wall is pierced by apertures that define the pattern to be produced.
  • a source of fluid jet pressure e.g. a water supply
  • a source of fluid jet pressure e.g. a water supply
  • GB-A-1 008 703 discloses a method of manufacturing a heat seal tissue in which the heat seal fibres are preferentially deposited on a criss-cross network of lines along which the heat sealed seams of the final infusion bags will be formed. More particularly, GB-A-1 008 703 discloses a paper forming screen having a repeating pattern (in both the travelling direction of the screen during paper manufacture and the direction perpendicular thereto) of spaced regions (e.g. squares) that are blocked to the passage of water, e.g. by gelatin. These spaced, blocked regions define, in effect, a criss-cross arrangement of lines (by which the blocked regions are separated) and these lines are unblocked.
  • spaced regions e.g. squares
  • the screen comprises, in effect, a criss-cross arrangement of lines in which there is no blockage to drainage with these lines bounding the discrete blocked-off areas.
  • the criss-cross lines of the paper (which there is preferential accumulation of fibres) are used for providing the seams of beverage infusion bags whereas those regions of the paper corresponding to the blocked off areas of the screen provide the "faces" of the bags.
  • the blocked off areas of the screen typically have an area of at least 500mm 2 , e.g. about 625mm 2 .
  • a further type of paper-forming screen that is "configured” to provide a desired "effect” in the finally produced paper is disclosed in EP-A-0 135 231 (Procter & Gamble).
  • the screen of this disclosure comprises a honeycomb-type frame formed on the base material of the paper forming screen, this frame providing areas of the screen that are blocked to drainage.
  • the screen is used to produce a paper (such for paper towels or facial tissue) having surface protrubrunces formed in the open cells of the honeycomb. It is an object of the present invention to obviate or mitigate the abovmentioned disadvantages.
  • a screen for use in forming a patterned paper by a wet-laying technique the screen being of a mesh material that is pervious to water and having formed therein repeats of pattern forming elements which are defined by an area of at least partial blockage of the mesh and which are bounded by mesh that is not blocked to drainage wherein the pattern forming elements have a maximum area of 100mm 2 that is blocked to drainage.
  • the invention also provides, in a second aspect, a method of forming a patterned paper comprising wet-laying a suspension of paper-forming fibres onto a screen as defined in the previous paragraph so as to form a web and draining water from the web to produce the patterned paper.
  • a pattern forming element is an area of the mesh material which is completely bounded externally (and possibly also internally see infra by unblocked mesh and which (i.e. the pattern forming element) is at least partially blocked to drainage, provided that within the area of the pattern forming element there is no more than 100mm blockage of the screen.
  • the area of the pattern forming element that is blocked to drainage is preferably a maximum of 50mm 2 and may be considerably less, e.g. a maximum of 25mm 2 or even a maximum of 10mm 2 .
  • individual pattern forming elements are bounded by unblocked mesh. This will be an unblocked area of the mesh surrounding the outer boundary of the element so that individual pattern forming elements will be separated from each other by an area of the screen where there is no blockage to drainage. It should also be understood that a pattern forming element can also be bounded internally by an area of the screen that is unblocked to drainage.
  • the boundary (inner or outer) of the character that is unblocked to drainage will generally comprise at least one line of apertures of the mesh that are totally unblocked to drainage. Thus, at a minimum, there will generally be a single line of (totally) unblocked apertures that may be traced between two adjacent pattern forming elements. Generally the boundary between two adjacent pattern defining elements will comprise (in going from one pattern forming element to the adjacent element) a plurality of apertures of the mesh that are totally unblocked to drainage.
  • a "motif comprised of, say, a letter within a circular (or oval, elliptical etc) boundary comprises two pattern forming elements, i.e. the letter and the circular boundary.
  • the pattern forming elements may be of any desired visual appearance and may for example, be letters of the alphabet or alternatively may be pictorial. It is possible for the pattern forming elements as defined above to be combined with non- blocked areas of the web so that it is the combination which gives rise to a recognisable pattern. Thus consider for example the letter "O". In this case, the pattern forming element will be formed by blockage of the screen to define the outline of the letter whereas the centre of the letter will be provided by an unblocked region of the screen.
  • the pattern forming elements are formed by at least partial blockage of the apertures of the mesh in the area of the pattern forming element.
  • the pattern forming elements may for example be defined by areas of complete blockage of the web to drainage. Alternatively the pattern forming elements may incorporate areas where there is no blockage to drainage.
  • Such unblocked areas may comprise one or more full apertures of the mesh that is/are unblocked to drainage. Several such unblocked full apertures of the mesh maybe juxtaposed to each other. Alternatively or additionally unblocked areas of the pattern forming elements may be formed by incomplete blockage of individual apertures of the mesh. Several such partially blocked apertures may be provided adjacent to each other so that their individual unblocked areas lie within the boundary of a larger unblocked area.
  • any one pattern forming element there may be several discontinuous areas that are unblocked to drainage.
  • a minority of the area of the pattern forming element is open to drainage. This ensures sufficient fibre concentration within the bounds of the pattern to ensure integrity of the web. Generally there will be at least 60% blockage in this area, more preferably at least 80%. The blockage may for example be 90%-100% of the area of the pattern forming element.
  • the screen in accordance with the invention will generally be in the form of an endless belt.
  • the individual pattern forming elements will generally be repeated in both the longitudinal transverse directions of the screen.
  • the material used for effecting blockage of base material does not project out of the plane of the base material.
  • the base material of the paper screen is a mesh-like structure, most preferably one formed from synthetic monofilaments.
  • the diameter of the fibres forming the mesh is in the range ⁇ .15 - 0.30mm.
  • the mesh comprises 32 filaments per centimetre in the machine direction and 30 filaments per centimetre in the cross direction.
  • a suitable mesh material is available from Albany International under the trade name of MONTOTEX K3.
  • Blockage of the base material to drainage may be provided by applying a synthetic resin to block apertures of the mesh so that the desired repeat of pattern forming elements is produced.
  • the resin may be applied by a printing technique such a screen printing, gravure printing, blanket offset printing.
  • a further possibility is the use of photoresist technology in which a negative of the desired formation of pattern forming elements is juxtaposed to the base screen material impregnated with curable resin.
  • Light e.g. uv radiation
  • Other techniques that can be used include transfer coating.
  • the polymer used for effecting blockage of the apertures should be compatible with the base material of the screen and may for example be a film forming polymeric resin.
  • suitable resins include polyamides and polyurethanes
  • Paper forming screens as described above may be used for producing tissue, for beverage infusion bags, by standard wet-laying techniques, e.g. using an inclined wire paper making machine.
  • the material produced may be of the heat seal or non- heat seal type and may for example have a basis weight of 10 to 30 gm "2 , e.g. 10 to 20 gm "2 .
  • the spacings between the repeats of the patterns will generally be such that there are a number of repeats of the pattern on each "face" of the beverage infusion bag.
  • the fibres used in this paper making process will have a length of 3 to 5mm and may comprise only cellulose fibres (for a non-heat seal material) or a blend of cellulose and thermoplastic fibres for a heat seal material.
  • Tissues produced with the paper making screen of the invention have a number of advantages compared with those produced by fluid jet patterning.
  • tissues produced in accordance with the invention have good mechanical properties (since there has been no disruption of the fibres by a patterning jet).
  • the improved strength is an advantage for resisting tearing of the web by deckle edge sprays and also for conversion of the web into beverage infusion packages on standard conversion machinery.
  • the papers have better sifting properties.
  • a further advantage lies in the fact that production speed of the paper web is not limited by the speed by which the fluid patterning arrangement may be operated. Similar advantages apply to the present invention as compared to the use of "knuckles" for forming a pattern in the paper. Moreover, as compared to the use of "knuckles", the present invention allows complete flexibility of the choice of the pattern forming elements and the invention is not confined to the use of fibres of a particular morphology.
  • Tissues produced in accordance with the invention may be produced on standard conversion machinery to produce (beverage infusion bags).
  • Fig 1 illustrates one embodiment of paper-forming screen in accordance with the invention
  • Fig 2 illustrates, to a much enlarged scale, the base material from which the screen illustrated in Fig 1 is produced;
  • Fig 3 illustrates the manner in which a pattern is provided in the base material of Fig 2 to produce a screen as shown in Fig 1;
  • Fig 4 illustrates the production of paper.
  • a screen 1 in accordance with the invention for use in forming, by a conventional wet-laying technique, a patterned tissue for the production of beverage infusion bags such as tea-bags or coffee-bags.
  • the screen 1 is formed of a water pervious base material 2 (described below with reference to Fig 2) in which regions thereof have been at least partially blocked, in the manner described more fully below, to the passage of water so as to define repeats of pattern forming elements.
  • the at least partially blocked regions are depicted in Fig 1 by dark coloration and unblocked areas of the base material 2 are depicted as white.
  • Various types of pattern forming element are shown in Fig 1 with each type repeating in two perpendicular directions, i.e. along the length and across the width of the screen.
  • the repeating pattern forming elements are as follows:
  • Each of the pattern forming elements 3a-c, 4a-d and 5 has an area of less than 100mm 2 .
  • the base material 2 is shown to a much enlarged scale in Fig 2 and is of a mesh-like structure comprised of synthetic plastics monofilaments 6 arranged to define apertures 7 whereby material 2 is water pervious. It should be appreciated that those areas of the screen 1 which are shown in Fig 1 as white (to represent unblocked areas) are of the open mesh structure shown in Fig 2.
  • Fig 3 shows the manner in which the letter "J” is formed for the patterning of the screen. More particularly, for each repeating "J” there is a "J-shaped” region in which certain of the original apertures 7 within the bounds of the "J” are blocked to an extent of 75% by a polymer 8. More particularly, unblocked areas of four apertures 7 are arranged in groups so as to define a larger diamond-shaped unblocked areas of the mesh. Furthermore, as seen in Fig 3, the unblocked diamond-shaped areas are arranged such that the "bar” and “vertical stem” of the letter “J” incorporates several such diamond-shaped areas where there is no blockage (of the mesh) to drainage.
  • the letter “C” of the letter set “JRC” may be constructed in like manner as also may be the letter “R” although in the latter case it should be noted that the area of the "loop" of the letter is unblocked to drainage so as to give the required overall appearance.
  • Each "cup and saucer” design is made up of four pattern forming elements 4a, 4b, 4c and 4d each of which is bounded by an unblocked region of the screen and which together with unblocked regions of the mesh give the overall appearance of a cup-and-saucer.
  • Each of the elements 4a-d may be formed in a similar manner to the letter "J" as described above.
  • the diamonds 5 may be constructed in like manner to the letter "J".
  • the screen 1 may be produced, for example, by a printing technique which lays down onto the base material 2 the areas of polymer (e.g. as represented by reference numeral 8 for the letter "J") which provide for at least partial blockage of the apertures 7 thereby defining the pattern forming elements 3a-c, 4a-d and 5.
  • printing techniques that can be used include screen printing, gravure printing, blanket offset printing. Transfer coating may also be used.
  • the screen 1 (with its areas of cured resin) may be produced using photoresist technology.
  • the base material 2 may be coated with a resin (e.g. curable by ultraviolet light) and juxtaposed to a negative of the arrangement of blocked and/or partially blocked apertures to be provided in the final screen.
  • the assembly of negative and resin coated base material 2 is then irradiated so as to cure the resin in those areas of the base material which are to be blocked or partially blocked.
  • uncured resin is removed to leave the final screen.
  • the curable resin system is one which is such that the uncured areas may be removed by water.
  • the screen 1 is intended for use in producing paper by a wet-laying technique.
  • a wet-laying technique is illustrated schematically in Fig 4 from which it will be seen that the screen 1 is provided as an endless belt onto which is deposited an aqueous suspension of paper-forming fibres from a headbox 9.
  • the screen 1 is provided as an endless belt onto which is deposited an aqueous suspension of paper-forming fibres from a headbox 9.
  • water is drained through the screen (e.g. with the aid of vacuum boxes) so as to form the paper web 10 which is subsequently removed for drying and reeling operations, all of which are entirely conventional.
  • the endless belt may be of the "inclined wire" type.
  • the final web 10 carries a pattern corresponding to that on the screen 1.
  • the formation of this pattern results from the drainage characteristics of the screen 1. More particularly, during drainage of the laid suspension, a greater "concentration" of fibres accumulates in those areas of the screen that are not obscured by resin than in those areas which are so obscured. The visible pattern on the final web is therefore due to differential amounts of fibres in the web as between those areas laid on blocked and unblocked regions of the screen. Consequently the final has a pattern corresponding to that of the screen 1.
  • the paper web 10 incorporates repeats of the letter set JRC on a lozenge-shaped background and repeats of the cup and saucer. There are also repeats of the diamond shape and in the final paper web 1 these give the impression of perforations in the paper.

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  • Paper (AREA)

Abstract

La présente invention se rapporte à une toile (i) destinée à la formation d'un papier à motifs selon une technique de formation par voie humide. Cette toile de fabrication est composée d'un matériau de type filet (2) qui est perméable à l'eau et comporte des éléments répétitifs (3a-c, 4a-d et 5) de formation de motifs, lesdits éléments étant définis par une surface de blocage au moins partiel du filet et étant liés par le filet qui n'est pas bloqué vis à vis du drainage. Les éléments de formation de motifs présentent une surface maximale de 100mm2 qui est bloquée vis à vis du drainage. Cette toile de fabrication peut être utilisée pour produire du papier de soie à motifs destiné à la fabrication de sachets pour le thé ou le café.
PCT/GB2002/001720 2001-05-01 2002-04-12 Toile de fabrication et procede de creation de motifs sur papier WO2002088464A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60222251T DE60222251T2 (de) 2001-05-01 2002-04-12 Verfahren zur herstellung von gemustertem papier
EP02720212A EP1383957B1 (fr) 2001-05-01 2002-04-12 Procede de creation de motifs sur papier
US10/475,564 US6998020B2 (en) 2001-05-01 2002-04-12 Screen and process for paper patterning

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0110616.0 2001-05-01
GB0110616A GB0110616D0 (en) 2001-05-01 2001-05-01 Paper patterning
GB0111680A GB0111680D0 (en) 2001-05-11 2001-05-11 Paper patterning
GB0111680.5 2001-05-11

Publications (1)

Publication Number Publication Date
WO2002088464A1 true WO2002088464A1 (fr) 2002-11-07

Family

ID=26246021

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/001720 WO2002088464A1 (fr) 2001-05-01 2002-04-12 Toile de fabrication et procede de creation de motifs sur papier

Country Status (5)

Country Link
EP (1) EP1383957B1 (fr)
AT (1) ATE372415T1 (fr)
DE (1) DE60222251T2 (fr)
ES (1) ES2292745T3 (fr)
WO (1) WO2002088464A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6998020B2 (en) * 2001-05-01 2006-02-14 J R Crompton Limited Screen and process for paper patterning
US7005044B2 (en) 2002-12-31 2006-02-28 Albany International Corp. Method of fabricating a belt and a belt used to make bulk tissue and towel, and nonwoven articles and fabrics
US7005043B2 (en) 2002-12-31 2006-02-28 Albany International Corp. Method of fabrication of a dryer fabric and a dryer fabric with backside venting for improved sheet stability
US7008513B2 (en) 2002-12-31 2006-03-07 Albany International Corp. Method of making a papermaking roll cover and roll cover produced thereby
US7014735B2 (en) 2002-12-31 2006-03-21 Albany International Corp. Method of fabricating a belt and a belt used to make bulk tissue and towel, and nonwoven articles and fabrics
US7022208B2 (en) 2002-12-31 2006-04-04 Albany International Corp. Methods for bonding structural elements of paper machine and industrial fabrics to one another and fabrics produced thereby
US7166196B1 (en) 2002-12-31 2007-01-23 Albany International Corp. Method for manufacturing resin-impregnated endless belt structures for papermaking machines and similar industrial applications and belt
US7169265B1 (en) 2002-12-31 2007-01-30 Albany International Corp. Method for manufacturing resin-impregnated endless belt and a belt for papermaking machines and similar industrial applications
US7815978B2 (en) 2002-12-31 2010-10-19 Albany International Corp. Method for controlling a functional property of an industrial fabric
WO2019051434A1 (fr) * 2017-09-11 2019-03-14 Crane & Co., Inc. Feuille de filigrane, appareil et document, et leurs procédés de fourniture
RU2787863C2 (ru) * 2017-09-11 2023-01-13 Крейн Энд Ко., Инк. Устройство для создания водяных знаков, лист и документ с водяными знаками, а также способы их изготовления

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3350260A (en) * 1963-07-29 1967-10-31 Crompton & Bros James R Method of forming a configured fibrous web containing paper-making fibers and fibers of a heat-sealable material
WO1993000474A1 (fr) * 1991-06-28 1993-01-07 The Procter & Gamble Company Procede et appareil de fabrication de structures fibreuses cellulosiques par drainage a obturation selective et structures fibreuses cellulosiques ainsi produites
US5462642A (en) * 1993-09-16 1995-10-31 Kajander; Richard E. Method of forming a fibrous mat
WO1996035018A1 (fr) * 1995-05-05 1996-11-07 Kimberly-Clark Worldwide, Inc. Formation decorative de papier mousseline

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3350260A (en) * 1963-07-29 1967-10-31 Crompton & Bros James R Method of forming a configured fibrous web containing paper-making fibers and fibers of a heat-sealable material
WO1993000474A1 (fr) * 1991-06-28 1993-01-07 The Procter & Gamble Company Procede et appareil de fabrication de structures fibreuses cellulosiques par drainage a obturation selective et structures fibreuses cellulosiques ainsi produites
US5462642A (en) * 1993-09-16 1995-10-31 Kajander; Richard E. Method of forming a fibrous mat
WO1996035018A1 (fr) * 1995-05-05 1996-11-07 Kimberly-Clark Worldwide, Inc. Formation decorative de papier mousseline

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6998020B2 (en) * 2001-05-01 2006-02-14 J R Crompton Limited Screen and process for paper patterning
US7005044B2 (en) 2002-12-31 2006-02-28 Albany International Corp. Method of fabricating a belt and a belt used to make bulk tissue and towel, and nonwoven articles and fabrics
US7005043B2 (en) 2002-12-31 2006-02-28 Albany International Corp. Method of fabrication of a dryer fabric and a dryer fabric with backside venting for improved sheet stability
US7008513B2 (en) 2002-12-31 2006-03-07 Albany International Corp. Method of making a papermaking roll cover and roll cover produced thereby
US7014735B2 (en) 2002-12-31 2006-03-21 Albany International Corp. Method of fabricating a belt and a belt used to make bulk tissue and towel, and nonwoven articles and fabrics
US7022208B2 (en) 2002-12-31 2006-04-04 Albany International Corp. Methods for bonding structural elements of paper machine and industrial fabrics to one another and fabrics produced thereby
US7166196B1 (en) 2002-12-31 2007-01-23 Albany International Corp. Method for manufacturing resin-impregnated endless belt structures for papermaking machines and similar industrial applications and belt
US7169265B1 (en) 2002-12-31 2007-01-30 Albany International Corp. Method for manufacturing resin-impregnated endless belt and a belt for papermaking machines and similar industrial applications
US7297234B2 (en) 2002-12-31 2007-11-20 Albany International Corp. Methods for bonding structural elements of paper machine and industrial fabrics to one another and fabrics produced thereby
US7527707B2 (en) 2002-12-31 2009-05-05 Albany International Corp. Methods for bonding structural elements of paper machine and industrial fabrics to one another and fabrics produced thereby
US7815978B2 (en) 2002-12-31 2010-10-19 Albany International Corp. Method for controlling a functional property of an industrial fabric
US7919173B2 (en) 2002-12-31 2011-04-05 Albany International Corp. Method for controlling a functional property of an industrial fabric and industrial fabric
WO2019051434A1 (fr) * 2017-09-11 2019-03-14 Crane & Co., Inc. Feuille de filigrane, appareil et document, et leurs procédés de fourniture
CN111051611A (zh) * 2017-09-11 2020-04-21 克瑞尼股份有限公司 水印片板、装置和文档、以及用于提供水印片板、装置和文档的方法
US10843500B2 (en) 2017-09-11 2020-11-24 Crane & Co., Inc. Watermark sheet, apparatus, and document, and methods for providing the same
RU2787863C2 (ru) * 2017-09-11 2023-01-13 Крейн Энд Ко., Инк. Устройство для создания водяных знаков, лист и документ с водяными знаками, а также способы их изготовления
CN111051611B (zh) * 2017-09-11 2023-02-28 克瑞尼股份有限公司 水印片板、装置和文档、以及用于提供水印片板、装置和文档的方法

Also Published As

Publication number Publication date
EP1383957A1 (fr) 2004-01-28
ATE372415T1 (de) 2007-09-15
DE60222251D1 (de) 2007-10-18
EP1383957B1 (fr) 2007-09-05
DE60222251T2 (de) 2008-06-26
ES2292745T3 (es) 2008-03-16

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