EP1299596A1 - Sachets d'infusions et materiaux a cet effet - Google Patents

Sachets d'infusions et materiaux a cet effet

Info

Publication number
EP1299596A1
EP1299596A1 EP01949619A EP01949619A EP1299596A1 EP 1299596 A1 EP1299596 A1 EP 1299596A1 EP 01949619 A EP01949619 A EP 01949619A EP 01949619 A EP01949619 A EP 01949619A EP 1299596 A1 EP1299596 A1 EP 1299596A1
Authority
EP
European Patent Office
Prior art keywords
tissue
fibres
pla
weight
insulating layer
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.)
Withdrawn
Application number
EP01949619A
Other languages
German (de)
English (en)
Inventor
Nicholas Robin Whittaker
John Edward Rose
Simon Mark Scott
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.)
J R Crompton Ltd
Original Assignee
J R Crompton 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 J R Crompton Ltd filed Critical J R Crompton Ltd
Publication of EP1299596A1 publication Critical patent/EP1299596A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/08—Filter paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/24—Polyesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/02—Synthetic cellulose fibres
    • D21H13/08—Synthetic cellulose fibres from regenerated cellulose
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]

Definitions

  • the present invention relates to porous, fibrous web materials of the heat seal type for use in producing beverage infusion packages (e.g. tea bags, coffee bags and the like) as well as to beverage infusion packages produced using such materials.
  • beverage infusion packages e.g. tea bags, coffee bags and the like
  • Beverage infusion packages comprise a particulate beverage precursor material, e.g. tea leaves or ground coffee, in a bag, sachet, pouch or the like (all conveniently referred to herein as a bag) of a porous, fibrous (usually cellulosic) material.
  • This material typically has a basis weight of 10 to 30 g m “2 and is often referred to as "tissue” or "tissue paper”.
  • the package is infused with hot water. This may be done, for example, by immersing the package in hot water, pouring hot water onto the package, or heating water and the bag in a microwave oven.
  • the infusion package may be of a size, and contain an amount of the beverage precursor material, so as to be intended for producing a single cup of the beverage.
  • the package may be of a "catering size” and as such intended to produce a plurality of servings of the beverage.
  • Such a "catering size” package may for example contain ground coffee. as the beverage precursor material and be used in a- commercial coffee-making machine.
  • Heat seal tissue usually (but not necessarily) comprises two or more layers wet-laid in succession one on top of the other.
  • One layer incorporates thermoplastic fibres (e.g. polypropylene) and the other incorporates only thermally inactive materials.
  • the tissue will generally also incorporate a wet strength agent and is typically manufactured by a wet laid process on an inclined wire paper making machine.
  • a beverage infusion package is produced from the heat seal such tissue by forming the bag such that layers of the tissue incorporating thermoplastic fibres are juxtaposed and then heat sealed.
  • thermoplastics which can be used as fibres for producmg heat seal tissue and, when used for producing beverage infusion packages, give more than adequate performance.
  • tissue has a disadvantage in that the waste material (“broke") generated during manufacture of the tissue (e.g. as a result of reeling operations) cannot successfully be reused. This is because the tissue will not break down during standard alkaline conditions used in fibre recovery processes.
  • non standard chemicals and high levels of mechanical energy have to be used, and these result in a low grade recovered fibre source, still containing thermoplastic material, which is undesirable.
  • the fibre length of the resultant material is dramatically reduced from a virgin mean fibre range of typically 3.5 - 6 mm down to 0.96 - 1.65 mm.
  • thermoplastic fibres are generally not biodegradable and therefore remain in the environment. This disadvantage also applies to the disposal of used beverage infusion packages (produced form the tissue) in land fill sites.
  • a non-woven porous, fibrous tissue for use in producing beverage infusion packages, wherein said tissue comprises fibres produced from poly lactic acid (PL A).
  • a beverage infusion package comprising a bag of a non-woven porous, fibrous tissue as defined in the previous paragraph, and a beverage precursor material contained within the bag.
  • the PLA fibres in the tissue are thermoplastic and serve as heat seal fibres for the purposes of thermally bonding two layers of the tissue together.
  • PLA fibres in tissue to be used for producing beverage infusion bags significantly improves the "re-pulpabilty" of the tissue.
  • Material produced using PLA will re-pulp under alkaline condition as the PLA readily hydrolyses.
  • This method of removing the PLA fibres fits with the process for removing the typical wet strength systems used in the production of the aforementioned porous tissue.
  • the ability to "peel" the PLA fibres away from the de- wet strengthened cellulose matrix enables the fibre length of the recovered pulp to be maximised to a typically mean fibre range of 2.5 - 3.5 mm.
  • thermoplastic fibres This increase in overall mean fibre length range and the removal of thermoplastic fibres enables more waste material to be utilised in both the "parent" product, without detracting from product performance or production efficiencies, and other non related NHSTB products without the problem of inclusion of a small percentage of thermoplastic from the inclusion of broke. These factors result in a significant reduction in the requirement for the use of landfill or incineration of waste "broke” materials.
  • PLA polymers degrade in the . environment into lactic acid (monomer).
  • tissue disposed of to a typical landfill site e.g. in the form of a "used beverage infusion package”
  • tissue disposed of to a typical landfill site e.g. in the form of a "used beverage infusion package”
  • the impact on the environment is significantly reduced compared to the current thermoplastic containing materials.
  • PLA polylactic acid
  • PLA polylactic acid
  • D(+) and L(-) isomers used in the polycondensation reaction, it is possible to significantly affect the degree of crystallinity of the PLA and therefore adjust properties such as melting/softening point.
  • a 100% L(-) isomer would give a melt flow temperature of circa 170°C, while a combination of 88% L(-) and 12 % D(+) isomers would produce a melt flow value of circa 120°C.
  • PLA fibres for use in the invention may be obtained from Unitika Fibre of Japan under the trade name of Terramac.
  • Beverage infusion packages may be produced from tissue in accordance with the invention on standard converting machinery at throughput rates commensurate with those achieved using conventional tissue with seals of adequate strength.
  • the PLA fibres will preferably have a fibre length of 2mm to 8mm, more preferably 4mm to 6mm, and ideally about 5mm.
  • the PLA fibres are from 0.9 dcTex to 4.4 dcTex, more preferably from 1.4 dcTex to 3.3 dcTex, even more preferably 1.7 dcTex to 2.6 dcTex and most preferably from 1.9 dcTex to 2.2 dcTex for optimum fibre coverage.
  • the PLA fibres preferably melt (soften) at a temperature of 140-175°C and have an MFI (MFR) value of 10 - 14 (230°C, 2.16 kgs).
  • the PLA fibres may be single component fibres. It is however also possible for at least a portion of the PLA fibres to be bicomponent fibres comprised of a PLA core and an outer PLA sheath of significantly lower melting point than the core.
  • the PLA core may have a melting point of about 260°C whereas that of the PLA sheath may be 105°C to 175°C.
  • the bicomponent fibres may be the sole PLA fibres in the tissue.
  • the sheath of the bicomponent fibres will generally be such as to melt (soften) at a temperature of 140- 175°C and have an MFI (MFR) value of 10 - 14 (230°C, 2.16 kgs), i.e.
  • the tissue incorporates single component PLA fibres as the heat seal fibres and bicomponent fibres having a sheath with a lower melting (softening) temperature than the single component fibres.
  • the sheath of the bicomponent fibres may have a melting/softening temperature in the range 105°C to 165°C but lower than the melting (softening) temperature of the single component fibres.
  • the core of the bicomponent fibres may have a melting (softening) temperature of about 260°C with the core providing for added strength of the tissue.
  • PLA bicomponent fibres are incorporated in the tissue then these may be thermally bonded to each other at the cross-over points of these fibres during manufacture of the tissue (see infra) to give a significant increase in both dry and wet tensile strength, again with no affect on total tissue re-pulpability and product biodegradability.
  • the incorporation of bicomponent .(sheath and core) fibres in the tissue allows optionally for a string and tag to be thermally bonded to the beverage infusion bag.
  • Tissue in accordance with the invention will generally have a basis weight of 10 to 50 g m "2 more preferably 10 to 30 g m '2 , even more preferably 10 to 20 g m " 2 and still more preferably 10 to 18 g m "2 , e.g. 12 to 17 g m "2 .
  • the tissue will be a wet-laid material although production of the tissue as a dry laid material is also possible.
  • a heat seal tissue in accordance .with the invention may comprise only a single layer which is the thermally active layer and which incorporates the PLA fibres and also cellulosic material as conventionally used in the formation of tissue.
  • the heat seal tissue may also comprise an insulating layer incorporating only thermally inactive fibres.
  • the heat seal tissue incorporates a total of 10% to 40%, more preferably 15% to 35% by weight of the PLA fibres based on the weight of the thermally active layer. If the PLA fibres are comprised of both single component and bicomponent fibres then it is preferred that 60-80% by weight of the PLA fibres are single component fibres and correspondingly 20-40% by weight (of the PLA fibres) are bicomponent fibres.
  • Cellulosic fibres for incorporation in the thermally active layer may be conventionally woody and/or non-woody materials, e.g. Manila hemp, sisal, jute, bleached and unbleached soft wood and hard wood species.
  • the cellulose fibres may be of a regenerated or reconstituted cellulose such as viscose rayon or lyocell.
  • the cellulosic fibres in the thermally active layer will have a length of 1 mm to 5 mm.
  • Cellulosic fibres preferably provide 30% to 65% by Weight of the thermally active layer. It is preferred that the tissue incorporates 1% to 20%, more preferably 7% to 15% by weight of floe based on the weight on the thermally active layer.
  • Floes for use in the invention are heavily fibrillated fibres and for materials produced by a wet-laying technique on a papermaking machine (e.g. an inclined wire machine) act as an effective binder to provide "classic" wet web strength prior to drying and removing the non-woven tissue from the inclined wire forming fabric and provide dry web strength after drying the non-woven web.
  • the floe will generally have a fibre length within the range 0.1mm to 1.5mm but preferably about 1.0mm. At this fibre length, the area coverage of the fibre is significantly increased, compared to a typical fibrillated 5mm fibre, by a combination of internal and. external "cleaving" of the fibre wall surface.
  • the floe will have a SR value in the range 60° to 100°, more preferably 70° to 95°.
  • the heat seal tissue may optionally comprise both a thermally active layer (i.e. one incorporating the heat seal fibres) and a thermally inactive or insulating layer.
  • the former preferably comprises 60% to 80% by weight of the heat seal tissue and the latter 20% to 40% on the same basis. More preferably the former comprises 60% to 75% and the latter 25% to 40% on the same basis. Most preferably the heat seal tissue comprises 65% to 75% by weight of the thermally active layer and 25% to 35% by weight of the insulating layer.
  • the heat seal tissue incorporates a thermally inactive layer then this preferably comprises natural cellulosic fibres. Although it can also contain regenerated cellulose such as viscose rayon or lyocell in the order of 70% to 95% by weight of wood pulp and 5% to 30% by weight of synthetic cellulose, most preferably about 85% by weight wood pulp and about 15% by weight synthetic cellulose.
  • regenerated cellulose such as viscose rayon or lyocell in the order of 70% to 95% by weight of wood pulp and 5% to 30% by weight of synthetic cellulose, most preferably about 85% by weight wood pulp and about 15% by weight synthetic cellulose.
  • the synthetic cellulose fibres are preferably shorter than those in the thermally active layer and may have a length of 0.5mm to 5mm, preferably 1mm to 3mm.
  • Tissue in accordance with the invention is most preferably produced by wet- laying employing technique well established in this field.
  • the tissue may for example be produced on an inclined wire papermaking machine.
  • tissue comprises a thermally active layer and an insulating layer then these may be laid in either order. If biocomponent fibres are included then they may be thermally bonded during drying of the tissue on the paper making machine giving a significant increase in both dry and wet tensile strength.
  • the dry tensile strength of a wet laid tissue can be increased by coating (e.g. using a size press, blade coater, gravure printing press etc.) with a solution of a starch, or poly(vinyl)alcohol (95 - 99% hydrolysed) or latex (preferably a food approved SBR) or a cellulose ether, e.g. selected from methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, propyl cellulose, hydroxypropyl cellulose but most preferably carboxymethyl cellulose, at a level of 0.5% to 3%, more preferably 1% to 2% by weight of the tissue, to improve mechanical strengths.
  • a starch or poly(vinyl)alcohol (95 - 99% hydrolysed) or latex (preferably a food approved SBR) or a cellulose ether, e.g. selected from methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, propyl cellulose,
  • wet strength may be enhanced by the use of melamine.
  • Tissue in accordance with the invention may alternatively be produced by a dry-laying technique, in which case it will be preferred that the tissue incorporate bicomponent fibres.
  • Beverage infusion packages may be produced from tissue in accordance with the invention on standard converting machinery at throughput rates commensurate with those achieved using conventional tissue.
  • Example 1 The invention is illustrated by the following non-limiting Examples.
  • Example 1 The invention is illustrated by the following non-limiting Examples.
  • Example 1 The invention is illustrated by the following non-limiting Examples.
  • a wet-laid heat seal tissue having a basis weight of 16.5 g m '2 was prepared from a furnish comprising
  • the fibrous web was treated with 3.0% by weight melamine applied at the wet end of the paper machine.
  • the resultant product converted at satisfactory speeds on standard tea-bag manufacturing machinery and gave tea bags with adequate seal strengths.
  • a wet-laid heat seal tissue having a basis weight of 16.5 gs was prepared from a furnish comprising
  • Lyocell fibres (3mm, 2.4 dcTex) 21.0%
  • the melting point for the single PLA fibre was 170°C
  • the melting points for the bi-component PLA fibre were 130°C sheath and 170°C core
  • the product obtained also again converted well on standard tea bag . manufacturing apparatus to give tea bags with adequate seal strength to with stand brewing by microwave method.
  • tissue produced in Examples 1 and 2 was under laboratory conditions to replicate the typical production scale re-pulping process.
  • the re-pulping procedure was also carried out on a standard polypropylene-containing tissue.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nonwoven Fabrics (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un tissu non tissé, poreux et fibreux s'utilisant dans la production de sachets d'infusion comprenant des fibres cellulosiques et des fibres d'acide polylactique afin d'améliorer la retrituration des déchets de matériaux.
EP01949619A 2000-06-30 2001-06-19 Sachets d'infusions et materiaux a cet effet Withdrawn EP1299596A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB0016116.6A GB0016116D0 (en) 2000-06-30 2000-06-30 Beverage infusion packages and materials therefor
GB0016116 2000-06-30
PCT/GB2001/002642 WO2002002871A1 (fr) 2000-06-30 2001-06-19 Sachets d'infusions et materiaux a cet effet

Publications (1)

Publication Number Publication Date
EP1299596A1 true EP1299596A1 (fr) 2003-04-09

Family

ID=9894781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01949619A Withdrawn EP1299596A1 (fr) 2000-06-30 2001-06-19 Sachets d'infusions et materiaux a cet effet

Country Status (5)

Country Link
US (1) US20040013831A1 (fr)
EP (1) EP1299596A1 (fr)
AU (1) AU2001270742A1 (fr)
GB (1) GB0016116D0 (fr)
WO (1) WO2002002871A1 (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10206924B4 (de) * 2002-02-19 2005-12-15 Papierfabrik Schoeller & Hoesch Gmbh & Co. Kg Heisssiegelfähige Filtermaterialien
DE10206926B4 (de) * 2002-02-19 2005-12-15 Papierfabrik Schoeller & Hoesch Gmbh & Co. Kg Heisssiegelfähige Filtermaterialien
DE10231403B3 (de) * 2002-07-11 2004-02-05 Papierfabrik Schoeller & Hoesch Gmbh & Co. Kg Heisssiegelfähiges Filtermaterial
GB0219600D0 (en) * 2002-08-22 2002-10-02 J R Crompton Ltd Beverage package
US6752905B2 (en) 2002-10-08 2004-06-22 Kimberly-Clark Worldwide, Inc. Tissue products having reduced slough
US6861380B2 (en) * 2002-11-06 2005-03-01 Kimberly-Clark Worldwide, Inc. Tissue products having reduced lint and slough
DE102004051298A1 (de) 2004-10-20 2006-04-27 Kalle Gmbh Faservlies mit verbesserter Naß- und Alkalifestigkeit und damit hergestellte Nahrungsmittelhülle auf Basis von Cellulosehydrat
US20080095959A1 (en) * 2006-10-20 2008-04-24 The Republic Of Tea Infusion package
DK2109637T3 (en) * 2007-01-16 2018-11-12 Frank Prissok HYBRID SYSTEMS OF FOAMED THERMOPLASTIC ELASTOMERS AND POLYURETHANES
US20100193116A1 (en) * 2007-07-12 2010-08-05 Innventia Ab Method for manufacturing a composite material having reduced mechanosorptive creep, the composite material, use of the method and the composite material
US9085410B2 (en) * 2010-06-10 2015-07-21 Fres-Co System Usa, Inc. Single brew beverage cartridge system including same and method of use
US8828895B2 (en) * 2010-08-25 2014-09-09 Nonwoven Network LLC Webs of bi-component and mono-component Co-PLA fibers
PL2663447T3 (pl) * 2011-01-13 2015-10-30 Unilever Nv Sposób termoformowania pakietów do parzenia
CN102277795A (zh) * 2011-08-12 2011-12-14 浙江凯恩特种材料股份有限公司 一种滤袋滤纸及茶叶滤袋和袋装茶叶
DK2847383T3 (en) * 2012-05-11 2017-02-20 Södra Skogsägarna Ekonomisk Förening A process for preparing a composition comprising cellulose pulp fibers and thermoplastic fibers
CN103572647B (zh) * 2013-10-15 2015-11-18 昆山威胜干燥剂研发中心有限公司 一种干燥剂包覆膜
WO2016201414A1 (fr) 2015-06-11 2016-12-15 Tyton Biosciences, Llc Procédé et système de production de pâte, d'énergie et de biodérivés à partir de matières recyclées et végétales
EP3737783A4 (fr) 2018-01-12 2021-10-27 Circ, LLC Procédés de recyclage de fibres de coton et de polyester à partir de déchets textiles
CN109335254B (zh) * 2018-10-10 2019-12-20 江苏云之尚节能科技有限公司 一种全降解的保温环保速运包装袋

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JP3319531B2 (ja) * 1993-11-05 2002-09-03 東洋紡績株式会社 生分解性不織布
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WO1998050611A1 (fr) * 1997-05-02 1998-11-12 Cargill, Incorporated Fibres polymeres degradables; preparation; produit; et procedes d'utilisation
JP4390302B2 (ja) * 1998-10-27 2009-12-24 ユニチカ株式会社 生分解性を有する成型用不織布、その製造方法、同不織布を用いてなる容器形状品

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Also Published As

Publication number Publication date
US20040013831A1 (en) 2004-01-22
WO2002002871A1 (fr) 2002-01-10
AU2001270742A1 (en) 2002-01-14
GB0016116D0 (en) 2000-08-23

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