EP1237447B1 - Conditionnements d'infusions et materiaux correspondants - Google Patents

Conditionnements d'infusions et materiaux correspondants Download PDF

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Publication number
EP1237447B1
EP1237447B1 EP00985547A EP00985547A EP1237447B1 EP 1237447 B1 EP1237447 B1 EP 1237447B1 EP 00985547 A EP00985547 A EP 00985547A EP 00985547 A EP00985547 A EP 00985547A EP 1237447 B1 EP1237447 B1 EP 1237447B1
Authority
EP
European Patent Office
Prior art keywords
package
thermoplastic
fibrous material
porous
thermoplastic fibres
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
EP00985547A
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German (de)
English (en)
Other versions
EP1237447A2 (fr
Inventor
John Edward Rose
Andrew Kevin Jordan
Glyn A. Wardle
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
Priority claimed from GBGB9929349.0A external-priority patent/GB9929349D0/en
Priority claimed from GBGB9929452.2A external-priority patent/GB9929452D0/en
Application filed by J R Crompton Ltd filed Critical J R Crompton Ltd
Publication of EP1237447A2 publication Critical patent/EP1237447A2/fr
Application granted granted Critical
Publication of EP1237447B1 publication Critical patent/EP1237447B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
    • B65D85/808—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package for immersion in the liquid to release part or all of their contents, e.g. tea bags
    • 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
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/14—Polyalkenes, e.g. polystyrene polyethylene
    • 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

Definitions

  • the present invention relates to a beverage infusion packages (e.g. tea bags, coffee bags and the like) as well as to porous, fibrous web materials for use in producing such packages.
  • a beverage infusion packages e.g. tea bags, coffee bags and the like
  • porous, fibrous web materials for use in producing such packages.
  • Beverage infusion packages such as tea bags comprise a particulate beverage precursor material, e.g. tea leaves or coffee granules, in a bag, sachet, pouch or the like (all conveniently referred to herein as a bag) of a porous, fibrous 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".
  • tissue may be of the "heat seal” or “non-heat seal” type and the invention is primarily concerned with the production of beverage infusion packages by techniques which do not involve heat sealing although a description of "heat seal” tissue is given below for the sake of completeness.
  • Heat seal tissue comprises two or more layers wet-laid in succession one on top of the other.
  • One layer contains only cellulosic fibres and the other incorporates thermoplastic fibres.
  • a beverage infusion package is produced from such tissue by forming the bag such that layers of the tissue incorporating thermoplastic fibres are juxtaposed and then heat sealed.
  • Non-heat seal tissue generally (but not necessarily) comprises a single wet-laid layer of cellulosic fibres produced from mixtures of well known paper-making fibres which may include both woody and non-woody materials, e.g. Manila hemp, sisal, jute, bleached and unbleached soft wood and hard wood species and in some instances approved synthetic fibres such as viscose rayon.
  • the material is typically manufactured by the wet laid process on an inclined wire paper-making machine. The material is generally treated with classic wet and dry strength chemical enhancing products, such as CMC (carboxymethyl cellulose) and Kymene (epichlorohydrin).
  • Beverage infusion packages e.g. tea bags
  • non-heat seal material incorporate a seam formed by a mechanical compression action (e.g. involving crimping).
  • Examples of such packages are those of the "double-chamber” type having attached string and tag as produced by both Constanta and Perfecta machines the world over.
  • such double chamber packages are produced by longitudinally folding a strip of the non-heat seal tissue so that the free longitudinal edges are adjacent to each other. These two edges are then folded over together several times and the fold then reinforced by means of a pressure controlled toothed wheel known to those skilled in the art as a Crimp Wheel.
  • the thus formed tube is then formed into the final double-chamber beverage infusion package (incorporating beverage precursor material).
  • Such a package comprises, in effect, a short length of the tube folded transversely so that the widthwise ends are adjacent to each other and with the crimped seal extending lengthwise along the inner sides of the package which is closed at its transverse ends by a staple to which may be attached a string and tag.
  • 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. This action, of infusing the package with hot water, causes the bag to inflate and float due to water bridging the pore structure of the tissue and creating a gas barrier film entrapping the atmosphere and volatiles generated during the brewing process.
  • the inflation of the package increases stress on the mechanically formed seam to a degree dependent, at least in part, on the type and dosage of the beverage precursor material in the package, e.g. black tea or herbal tea.
  • the stress on the mechanical seam may be such as to result in failure thereof causing tea leaves, coffee grounds or the like to be released into the beverage and this is obviously undesirable.
  • the problem of seam failure occurs when the wet crimp strength of the seam is not sufficiently high and is exaserpated in the microwave method of infusing the beverage where the extended period of energy input (e.g. for two minutes) increases the stress placed on the mechanical seam both in a cold and hot environment and has a detrimental effect on most classical wet and dry chemical systems employed.
  • DE-A-1 800 032 discloses a beverage infusion (e.g. a tea bag) formed of porous fibrous cellulosic material and having a closure seam produced by a mechanical compression action without heat sealing.
  • the fibrous cellulosic material may incorporate 20% of viscose synthetic fibre.
  • a beverage infusion package formed of porous, fibrous cellulsoic material and having a closure seam produced by a mechanical compression action without heat sealing, porous material containsing thermoplastic fibres which are amorphous or only partially crystalline characterised in that the thermoplastic fibres are present as a fused or thermally bonded network.
  • the beverage infusion package is formed from a material incorporating fibres of a thermoplastic which is amorphous or (more preferably) partially crystalline-, the thermoplastic fibres being present as a fused or thermally bonded network.
  • a thermoplastic which is amorphous or (more preferably) partially crystalline-
  • the thermoplastic fibres being present as a fused or thermally bonded network.
  • the dry strength of the seam is sufficient to prevent the package bursting open and spilling the beverage precursor material during manufacture, packaging, delivery and or consumer use.
  • the wet crimp strength is such that there is no significant seam failure when infusion packages in accordance with the invention either when boiling water is poured onto the package to brew the beverage or when the infusion package is heated with water in a microwave oven.
  • thermoplastic fibres in the paper at the opposite sides of the seam are bent and form an inter-locked synthetic matrix which is impervious to boiling water and microwave energy.
  • thermoplastic fibres are amorphous or only partially crystalline ensures that fibre recovery is limited which enables the crimped seam to be maintained under high stress in a hot aqueous environment.
  • the invention is particularly effective in the case where the mechanically formed seam is formed by folding over together adjacent edges of the porous material and applying a mechanical compressive force to the folded over edges.
  • the compressive force may be applied by crimping, e.g. using a pressure controlled toothed wheel (a so-called Crimp Wheel).
  • Crimp Wheel a pressure controlled toothed wheel
  • the fibres are crimped together providing an additional degree of interlocking and therefore enhancement of seam integrity.
  • the beverage infusion package of the invention may for example be a tea bag, e.g. of the double-chamber type, but is also applicable to other beverages, e.g. coffee.
  • the porous fibrous material will generally have a basic weight of 10 to 30gm -2 , more typically 10 to 20 gm 2, e.g. 10-13 gm 2 .
  • the material will comprise 5 to 30%, more preferably 10% to 30%, and ideally 15% to 25% by weight of the thermoplastic fibres.
  • the material may be formed by conventional paper-making techniques by laying a suspension comprised of cellulosic and thermoplastic fibres onto a paper-forming fabric of a paper-making machine (e.g. an inclined wire paper-making machine) and withdrawing water from the laid suspension through the fabric.
  • a paper-making machine e.g. an inclined wire paper-making machine
  • Cellulsoic fibres forming the suspension may be those conventionally used for producing non-heat paper for beverage infusion bags and may include both ''woody'' and "non-woody” materials such as manila hemp, sisal, jute, and bleached and unbleached soft wood and hard wood species.
  • non-woody material to woody material will be 40 to 80 parts of non-woody material to 20 to 60 parts woody material.
  • the material may be produced by laying successive layers of suspension (possibly of differing composition) one on top of the other, e.g. as described in WO-A- 704956. It is however more preferred that the material comprises only a single layer of the cellulosic and thermoplastic fibres.
  • a porous fibrous web material having a basis weight of 10 to 30 gm -2 and being comprised of a single, wet-laid layer of an admixture of cellulosic and thermoplastic fibres which are amorphous or are only partially crystalline, characterised in that the thermoplastic fibres are present as a fused or thermally bonded network.
  • Material in accordance with the second aspect of the invention is suitable, and primarily intended for, producing beverage infusion packages in accordance with the first aspect of the invention.
  • the material is also suitable for any use where a porous, high wet strength, mechanically crimped seam is required.
  • the crystallinity of the thermoplastic fibres is less than 40% to reduce fibre recovery to 10% which enables the mechanical seam to be retained under high stress in a hot aqueous environment. More preferably the crystallinity is 10-20%.
  • thermoplastics which may be used are polypropylene, polyester, polyamide 6, 66, 11, 12 and high density polyethylene. Blocked or random copolymers or terpolymers of propylene and ethylene may also be used.
  • thermoplastic fibres will preferably have a thickness of 0.55 to 6.7 decitex (0.5 to 6.0 denier) although best results will generally be achieved with fibres in the 2.2 to 4.4 decitex (2 to 4 denier) range.
  • the length of the thermoplastic fibres may be 0.5mm to 12mm, preferably 3mm to 6mm and more typically 5mm.
  • thermoplastic fibres in the web have been "fused” or thermally bonded together, at a temperature greater than the crystalline melt temperature of the thermoplastic fibres.
  • the crystallinity of the thermoplastic fibres from which the web is manufactured may be reduced to a desired value.
  • the fibres may initially have significant crystallinity (e.g. greater then 50% and possibly greater than 80%) and this crystallinity may be reduced by the heat treatment to the preferred value of, say, 10-20%.
  • the fibres become fused together at their junctions (or points of contact) to provide a cohesive reinforced crystalline matrix.
  • the affect of fusing the thermoplastic web further improves the dry and wet crimp functionality by increasing web elasticity specifically in the cross machine direction orientation.
  • thermoplastic fibres from which the web is produced may be of isotatic polypropylene drawn into fibres having a degree of crystallinity of at least 75%, the crystallinity subsequently being reduced during the above described "fusing" step.
  • the crystallinity of the fibres may be assessed colorimetrically.
  • polypropylene a preferred thermoplastic for use in the invention
  • the arrays of crystallites known as spherilites
  • the fibres when viewed under polarised light show a distinctive bright yellow colouration demonstrating a degree of crystallinity.
  • the material of the second aspect of the invention or any other material from which a beverage infusion package in accordance with the first aspect of the invention is to be produced may be treated (by either addition to the wet pulp stock suspension or at a size press unit) with agents known per se for imparting wet and dry strength, e.g. carboxymethyl cellulose (CMC) and epichlorohydrin (e.g. available under the name KYMENE (Trade Mark). These agents may be used such as to provide at least 1% by weight thereof on the material.
  • CMC carboxymethyl cellulose
  • KYMENE Trade Mark
  • the web is treated with epichlorohydrin
  • the poly(vinyl alcohol) is preferably one having a degree of hydrolysis of at least 60%, more preferably at least 80%, and most preferably 95% to 99.9%.
  • the poly(vinyl alcohol) may for example of the type known as the "super-hydrolysed” variety, e.g. as available under the AIRVOL (Trade Mark) as available from Air Products.
  • Levels at which the poly(vinyl alcohol) will be applied to the web will generally be in the range 0.5 to 4% by weight typically 1.0 to 2% by weight.
  • the porous fibrous material (from which the infusion package is produced) to be relatively hydrophilic such that, during brewing of the beverage, the bag rapidly wets out and sinks in the brew liquor providing a satisfactory infusion rate.
  • the hydrophilicity of the porous fibrous material may be measured by a water climb test in which the lower end of a vertically disposed strip (1"x 5" (2.54 x 12.70cm)) of the material is dipped into water and then time taken for the water to rise 1" (2.54cm) up the material is measured.
  • the porous, fibrous material has a water climb value of less than 70 seconds, e.g. 20 to 40 seconds, ideally about 30 seconds.
  • a further means of measuring, hydrophilicity is by the Water Drop Test in which a micro syringe is used to drop a small bead of water at ambient temperature on to a single layer of the infuser web, which is supported around its perimeter by a small diameter ring, typically 2" (5.08cms).
  • the time taken for the droplet of water to spread out and collapse into the infuser web, i.e. zero contact angle, is timed by means of a stopwatch.
  • the porous, fibrous material has a value in the Water Drop Test of less than 10 seconds, more preferably less than 5 seconds, and even more preferably less than 1 second.
  • the hydrophilicity of the web may be achieved by treatment with epichlorohydrin and poly(vinyl alcohol).
  • a standard NHSTB 12.3-13.0 gsm infuser web was produced on an inclined pilot paper machine from 70% Manila and 30% soft wood and bonded with 1% Kymene and 2% CMC. This material was then slit to 94.3 mm coils and conditioned in a humidified laboratory to the typical industry standard of 7-8% moisture content, as low moisture is known to significantly affect conversion parameters adversely.
  • a USA style latex NHSTB prototype at 12.3-13.0 gsm infuser web was produced in the inclined pilot paper machine from 70% Manila and 30% softwood and bonded with 1% Kymene and 13.5% of a co-polymer of Ethyl and Butyl acrylate latex. This material was then slit to 94.3mm coils and conditioned in a humidified laboratory to the typical industry standard of 7-8% moisture content.
  • a European style latex NHSTB prototype at 12.3-13.0 gsm infuser web was produced on the inclined pilot paper machine from 60% Manila, 30% softwood, 10% hardwood and bonded with 1% Kymene and 13.5% of a co-polymer of methacrylate Styrene Butadiene latex. This material was then slit to 94.3 mm coils and conditioned in a humidified laboratory to the typical industry standard of 7-8% moisture content.
  • a standard NHSTB 12.3-13.0 gsm infuser web was produced on the inclined pilot paper machine from 55% Manila and 30% softwood, 15% Polypropylene (3 denier, 5mm) and bonded with 1% Kymene. During the production of this material the polypropylene was "fused”/"thermally bonded” to an amorphous state by taking the polymer past its crystalline melt temperature. This material was then slit to 94.3mm coils and conditioned in a humidified laboratory to the typical industry standard of 7-8% moisture content.
  • a standard NHSTB 12.3-13.0 gsm infuser web was produced on the inclined pilot paper machine from 55% Manila and 30% softwood, 15% polypropylene (3 denier, 5mm) and bonded with 1% Kymene and 2% PVOH (Airvol 165). During the production of this material the polypropylene was "fused”/"thermally bonded” to an amorphous state by taking the polymer past its crystalline melt temperature. This material was then slit to 94.3mm coils and conditioned in a humidified laboratory to the typical industry standard of 7-8% moisture content.
  • the energy out put of microwaves has increased dramatically over the recent couple of years and is now typically 850-1200 watts for domestic appliances. It has also been observed that the energy inputted to the fusion packet during the typical brew cycle can also vary for a given microwave wattage depending on make, model and whether the microwave is "cold” i.e. the first use or is "hot” i.e. the second and subsequent uses during a sustained period.
  • test regime that has been adopted to evaluate the above observation and to provide a broad indication of infusion material acceptability over a range of conditions is outlined as follows:
  • the amount of tea that is allowed to pass through the infuser web is of critical importance as it limits how the tea bag producer can blend/mill the tea used. This impacts on both the final infusion rate of the tea bag and how much tea is lost into the package during transport (Tea sift).
  • the infusion rate is evaluated by measuring the colour change of the brew liquor of a period of time, typically 5-6 minutes, by colourimetry.
  • the following test regime has been adopted and is outlined as follows:
  • the dry strength of the crimp fin seal is of critical importance to both dry functionality in manufacture, packaging and end use, while the wet integrity of the crimped fin seal is obviously the key factor in brewing functionality.
  • Herbal teas are of high bulk for a given grammage.
  • the amount of tea dosed to herbal tea is still typically 1.5g-2.0g however the tea expands significantly during brewing and contains significant volumes of both ambient atmosphere and gases produced during the brewing process. The effect of this is to put an increased strain on the crimped fin seal, which with standard paper grades causing a rupturing of this seam.
  • Ex 1 Ex 2 Ex 3 Ex 4 Ex 5 Pour on Typical Latex Latex Microwave Microwave Test NHSTB Product US Product EU HSTB HSTB Ballooning 100% 20% 30% 100% 100% Open on Inspection 0% 20% 20% 5% 5% Burst 90% 10% 15% 5% 0%

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Apparatus For Making Beverages (AREA)
  • Laminated Bodies (AREA)
  • Tea And Coffee (AREA)
  • Non-Alcoholic Beverages (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)

Claims (35)

  1. Conditionnement d'infusion formé d'un matériau cellulosique fibreux, poreux et possédant un joint de fermeture produit par une action de compression mécanique sans thermoscellage, ledit matériau poreux contenant des fibres thermoplastiques qui sont amorphes ou qui ne sont que partiellement cristallines caractérisé en ce que les :fibres thermoplastiques sont présentes sous forme d'un réseau fondu ou thermiquement lié.
  2. Conditionnement suivant la revendication 1, dans lequel le thermoplastique présente une cristallinité de moins de 40%, de préférence de 10% à 20%.
  3. Conditionnement suivant la revendication 1 ou 2, dans lequel le thermoplastique est choisi parmi un polypropylène, un polyester, un polyamide et un polyéthylène haute densité.
  4. Conditionnement suivant la revendication 3, dans lequel la thermoplastique est ua polypropylène.
  5. Conditionnement suivant l'une quelconque des revendications 1 à 4, dans lequel le matériau fibreux comprend de 5 à 30% en poids des fibres thermoplastiques.
  6. Conditionnement suivant la revendication 5, dans lequel le matériau fibreux poreux comprend de 10 à 30% en poids des fibres thermoplastiques.
  7. Conditionnement suivant la revendication 6, dans lequel le matériau fibreux poreux comprend de 15% à 25% en poids des fibres thermoplastiques.
  8. Conditionnement suivant l'une quelconque des revendications 1 à 7, dans lequel les fibres thermoplastiques possèdent une épaisseur dans l'intervalle de 0,55 à 6,7 décitex (de 0,5 à 6,0 deniers).
  9. Conditionnement suivant la revendication 8, dans lequel les fibres thermoplastiques possèdent une épaisseur dans l'intervalle de 2,2 à 4,4 décitex (de 2 à 4 deniers).
  10. Conditionnement suivant l'une quelconque des revendications 1 à 8, dans lequel le matériau fibreux poreux est hydrophile.
  11. Conditionnement suivant la revendication 9, dans lequel le matériau fibreux poreux possède une valeur de montée d'eau de moins de 70 secondes, telle que mesurée par le temps pris pour que de l'eau s'élève à 2,54 cm (1 pouce) dans ce matériau.
  12. Conditionnement suivant la revendication 11, dans lequel le matériau fibreux poreux possède une voleur de montée d'eau de 20 à 40 secondes.
  13. Conditionnement suivant l'une quelconque des revendications 1 à 12, dans lequel le matériau fibreux poreux a été traité avec un poly(vinylalcool) présentant un degré d'hydrolyse d'au moins 60%.
  14. Conditionnement suivant la revendication 13, dans lequel le poly(vinylalcool) présente un degré d'hydrolyse d'an moins 80%.
  15. Conditionnement suivant la revendication 14, dans lequel le poly(vinylalcool) présente un degré d'hydrolyse de 95% à 99%.
  16. Conditionnement suivant l'une quelconque des revendicaaons 1 à 15, dans lequel le matériau fibreux poreux possède une masse surfacique de 10 à 30 gm-2.
  17. Conditionnement suivant l'une quelconque des revendications 1 à 16, dans lequel le joint formé mécaniquement a été formé en repliant ensemble des bords adjacents du matériau poreux et en appliquant une force de compression mécanique sur les bords repliés.
  18. Conditionnement suivant l'une quelconque des revendications 1 à 17, dans lequel le joint est un joint serti.
  19. Conditionnement suivant l'une quelconque des revendications 1 à 18, qui est du type double chambre.
  20. Conditionnement suivant l'une quelconque des revendications 1 à 19, qui est un sac de thé.
  21. Matériau fibreux poreux possédant une masse surfacique de 10 à 30 g m-2 et qui est composé d'une seule couche, déposée par voie humide d'un mélange de matériau cellulosique et de fibres thermoplastiques qui sont amorphes ou qui ne sont que partiellement cristallines caractérisé en ce que les fibres thermoplastiques sont présentes sous forme d'un réseau fondu on thermiquement lié.
  22. Matériau suivant la revendication 21, dans lequel le thermoplastique présente une cristallinité de moins de 40%.
  23. Matériau. suivant la revendication 21 ou 22, dans lequel le thermoplastique est choisi parmi un polypropylène, un polyester, un polyamide et un polyéthylène haute densité.
  24. Matériau suivant la revendication 23, dans lequel le thermoplastique est un polypropylène des revendications 21 à 24, dans, lequel le
  25. Matériau suivant l'une quelconque des revendications 21 à 24, dans lequel le matériau fibreux comprend de 5 à 30% en poids des fibres thermoplastiques.
  26. Matériau suivant la revendication 25, dans lequel le matériau fibreux poreux comprend de 10 à 30% en poids des fibres thermoplastiques.
  27. Matériau suivant la revendication 26, dans lequel le matériau fibreux poreux comprend de 15% à 25% en poids des fibres thermoplastiques.
  28. Matériau suivant l'une quelconque des revendications 21 à 27, dans lequel les fibres thermoplastiques possèdent une épaisseur dans l'intervalle de 0,55 à 6,7 décitex (de 0,5 à 6,0 deniers).
  29. Matériau suivant la revendication 28, dans lequel les fibres thermoplastiques possèdent une épaisseur dans l'intervalle de 2,2 à 4,4 décitex (de 2 à 4 deniers).
  30. Matériau suivant l'une quelconque des revendications 21 à 29, dans lequel le matériau fibreux poreux est hydrophile.
  31. Matériau suivant la revendication 30, dans lequel le matériau fibreux poreux possède une valeur de montée d'eau de moins de 70 secondes, telle que mesurée par le temps pris pour que de l'eau s'éléve à 2,54 cm (1 pouce) dans ce matériau.
  32. Matériau suivant la revendication 31, dans lequel le matériau fibreux poreux possède une valeur de montée d'eau de 20 à 40 secondes.
  33. Matériau suivant l'une quelconque des revendications 21 à 32, dans lequel le matériau fibreux poreux a été traité avec un poly(vinylalcool) présentant un degré d'hydrolyse d'an moins 60%.
  34. Matériau suivant la revendication 33, dans lequel le poly(vinylalcool) présente un degré d'hydrolyse d' an moins 80%.
  35. Matériau suivant la revendication 34, dans lequel le poly(vinylalcool) présente un degré d'hydrolyse de 95% à 99%.
EP00985547A 1999-12-13 2000-12-13 Conditionnements d'infusions et materiaux correspondants Expired - Lifetime EP1237447B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9929349 1999-12-13
GBGB9929349.0A GB9929349D0 (en) 1999-12-13 1999-12-13 Beverage infusion packages and materials therefor
GBGB9929452.2A GB9929452D0 (en) 1999-12-14 1999-12-14 Beverage infusion packages and materials therefor
GB9929452 1999-12-14
PCT/GB2000/004759 WO2001041610A2 (fr) 1999-12-13 2000-12-13 Conditionnements d'infusions et materiaux correspondants

Publications (2)

Publication Number Publication Date
EP1237447A2 EP1237447A2 (fr) 2002-09-11
EP1237447B1 true EP1237447B1 (fr) 2006-02-22

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EP00985547A Expired - Lifetime EP1237447B1 (fr) 1999-12-13 2000-12-13 Conditionnements d'infusions et materiaux correspondants

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EP (1) EP1237447B1 (fr)
AT (1) ATE318095T1 (fr)
AU (1) AU2195901A (fr)
DE (1) DE60026170T2 (fr)
WO (1) WO2001041610A2 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0219600D0 (en) 2002-08-22 2002-10-02 J R Crompton Ltd Beverage package
GB0313708D0 (en) * 2003-06-13 2003-07-16 J R Crompton Ltd Beverage package
GB0503714D0 (en) * 2005-02-23 2005-03-30 J R Crompton Ltd Beverage package
DE102018107944B3 (de) * 2018-04-04 2019-06-19 Delfortgroup Ag Verbessertes filterpapier, herstellungsverfahren und daraus gefertigter beutel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2925171A (en) * 1958-10-13 1960-02-16 Pneumatic Scale Corp Infusion bag and method of making the same
DE1800032A1 (de) * 1968-04-08 1969-10-23 Adolf Rambold Aufgussbeutel,insbesondere fuer Tee
US6303769B1 (en) 1994-07-08 2001-10-16 Immunex Corporation Lerk-5 dna

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ATE318095T1 (de) 2006-03-15
WO2001041610A2 (fr) 2001-06-14
AU2195901A (en) 2001-06-18
DE60026170D1 (de) 2006-04-27
WO2001041610A3 (fr) 2002-01-17
EP1237447A2 (fr) 2002-09-11
DE60026170T2 (de) 2006-11-23

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