EP0380127B1 - Thermosealing paper for tea bags, and process for making the same - Google Patents

Thermosealing paper for tea bags, and process for making the same Download PDF

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Publication number
EP0380127B1
EP0380127B1 EP90101601A EP90101601A EP0380127B1 EP 0380127 B1 EP0380127 B1 EP 0380127B1 EP 90101601 A EP90101601 A EP 90101601A EP 90101601 A EP90101601 A EP 90101601A EP 0380127 B1 EP0380127 B1 EP 0380127B1
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EP
European Patent Office
Prior art keywords
paper
phase
heat
tea bag
tea
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EP90101601A
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German (de)
French (fr)
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EP0380127A3 (en
EP0380127A2 (en
Inventor
Günter Dipl.-Phys. Heinrich
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UNICON PAPIER- und KUNSTSTOFFHANDELSGESELLSCHAFT MBH
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UNICON PAPIER- und KUNSTSTOFFHANDELSGESELLSCHAFT MBH
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Priority to AT90101601T priority Critical patent/ATE98720T1/en
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Publication of EP0380127A3 publication Critical patent/EP0380127A3/en
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    • 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
    • D21H13/16—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • 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
    • 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

Definitions

  • the invention relates to a teabag paper consisting of a first phase of natural fibers and a second phase of heat-sealing synthetic fibers.
  • the invention also relates to a method for producing such a teabag paper and its use for producing a teabag.
  • Heat-sealable teabag papers which have a basis weight of 16 g / m2 and up and which can be processed into teabags on high-speed packaging machines at up to 4000 units per minute.
  • These tea bag papers usually consist of about 75% natural fibers and about 25% heat-sealing synthetic materials.
  • DE-PS 1 546 330 describes a method in which the thermoplastic fibers and the non-heat-sealable fibers are deposited together in an aqueous suspension onto the screen in a paper machine. Due to the property of the lower density of the thermoplastic fibers made of polypropylene, a different content of polypropylene fibers is deposited on the two surfaces of the paper formed. The above-mentioned disadvantages of paper that can be sealed on one side also apply there. This process is described for a paper of 17 g / m2.
  • the object of the invention is achieved in that in one step an aqueous suspension of the natural fibers with a consistency of less than 0.1% is applied to a paper machine screen to form a first layer, that in a second step the heat-sealable synthetic fibers are deposited on the first layer in such a way that they penetrate the first layer, the penetration of the layers being stopped by the drainage, and that the synthetic fibers are subjected to a subsequent drying process are melted in such a way that they envelop the natural fibers during re-consolidation.
  • the penetration of the two layers can be particularly enhanced by sharp drainage.
  • Well-known natural fibers such as hemp, manila, jute, sisal and other long-fiber wood pulp are used for the first layer.
  • Polyethylene, polypropylene or copolymers of vinyl chloride and vinyl acetate are preferably used for the second layer of heat-sealable fibers.
  • Fig. 1b shows how through the described sharp drainage of the two layers, in particular the second layer with the fibers 2, a penetration of the two layers is achieved so that the synthetic fibers 2 get between the natural fibers 1 and from the top of the first layer down to the bottom between the natural fibers 1.
  • Fig. 2 shows the basic structure of a paper machine, as it can be used to produce a tea bag paper according to the invention.
  • a suspension “A” is formed from the ground natural fibers and water, and also a suspension “B” from the partially ground synthetic fibers and water.
  • the material 9 now formed from natural fibers and synthetic fibers is removed from the sieve and fed to drying.
  • This drying can be done in different ways, e.g. by contact drying or through-flow drying.
  • the elements 10 only give a rough schematic indication of corresponding drying elements.
  • the heating of the two-layer fiber material causes the synthetic fibers 2 in the mixed layer 9 to melt.
  • the synthetic fibers at least partially envelop the natural fibers, so that the tea bag paper rolled up on a roll 11 can be heat-sealed on both sides.
  • a tea bag paper according to the invention was compared with a conventional heat-sealable tea bag paper (sample B) and a conventional non-heat-sealable tea bag paper (sample C).
  • table A B C Basis weight [g / m2] 12.2 16.5 12.3 Time of first color development [sec.] 8.9 11.8 9.7 Tea diffusion factor (density x air resistance) 1.71 3.59 1.86
  • Pattern A is the subject of the invention, for pattern B around conventional known heat sealable tea bag papers, for pattern C around non-heat-sealable teabag papers.
  • the tea diffusion factor is a calculated quantity.
  • the lowest bulk density and high porosity (low air resistance) determine the speed at which tea leaching takes place from a bag. So if the product from bulk density and air resistance is as small as possible, the prerequisites for good tea leaching or tea diffusion are given.
  • the bulk density is the known quotient of the basis weight and the thickness.
  • the air resistance is specified in seconds and is determined by measuring the time in which a fixed volume of air flows through a defined area of the paper to be tested (see also Gurley measurement).

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Packages (AREA)
  • Tea And Coffee (AREA)
  • Making Paper Articles (AREA)
  • Apparatus For Making Beverages (AREA)
  • Laminated Bodies (AREA)

Abstract

The teabag paper comprises a first phase of natural fibres in a proportion of 60 - 85 % by weight and a second phase of heat-sealable synthetic fibres in the remaining proportion of 15 - 40 % by weight. The second phase penetrates the first phase in such a manner that both sides of the paper are heat-sealable, the weight per unit area of the paper being between 10 and 15 g/m<2>. The teabag paper has improved tea diffusion and can be processed in special, fast, automatic tea packing machinery due to the heat-sealability on both sides.

Description

Die Erfindung bezieht sich auf ein Teebeutelpapier, bestehend aus einer ersten Phase von Naturfasern und einer zweiten Phase von heißsiegelnden synthetischen Fasern. Außerdem betrifft die Erfindung ein Verfahren zur Herstellung eines solchen Teebeutelpapiers sowie dessen Verwendung zur Herstellung eines Teebeutels.The invention relates to a teabag paper consisting of a first phase of natural fibers and a second phase of heat-sealing synthetic fibers. The invention also relates to a method for producing such a teabag paper and its use for producing a teabag.

Es sind heißsiegelfähige Teebeutelpapiere bekannt, die ein Flächengewicht von 16 g/m² aufwärts haben und auf schnelllaufenden Abpackautomaten bis zu 4000 Stück pro Minute zu Teebeuteln verarbeitet werden können. Diese Teebeutelpapiere bestehen gewöhnlich etwa aus 75% Naturfasern und etwa 25% heißsiegelnden synthetischen Materialien.Heat-sealable teabag papers are known which have a basis weight of 16 g / m² and up and which can be processed into teabags on high-speed packaging machines at up to 4000 units per minute. These tea bag papers usually consist of about 75% natural fibers and about 25% heat-sealing synthetic materials.

In der EP-PS 00 39 686 sind ein mehrphasiges heißsiegelndes Fasermaterial und sein Herstellungsverfahren beschrieben. In diesem mehrphasigen Material sind Stellen mit hoher Teediffusion und solche mit geringer Teediffusion abwechselnd angeordnet. Dies wird dadurch erreicht, daß die Stellen hoher Teediffusion einen wesentlich geringeren Anteil an heißsiegelnden Fasern besitzen als die Stellen geringerer Diffusion. Abgesehen von dem dort beschriebenen aufwendigen Verfahren ist das Gewicht des Teebeutels mit 16,5 g/m² verhältnismäßig hoch. Durch die ungleichmäßige Anordnung der Heißsiegelfasern zur Ausbildung von Stellen hoher und niedriger Diffusion besteht außerdem die Gefahr, daß nach der Versiegelung des Teebeutels die Nähte im kochenden Wasser weniger beständig sind als die Nähte eines Beutels, welcher aus Papier mit einer durchgehend gleichmäßigen Heißsiegelschicht hergestellt ist.EP-PS 00 39 686 describes a multi-phase heat-sealing fiber material and its production process. In this multi-phase material, points with high tea diffusion and those with low tea diffusion are alternately arranged. This is achieved in that the points of high tea diffusion have a significantly lower proportion of heat-sealing fibers than the points of lower diffusion. Apart from the complex process described there, the weight of the tea bag is relatively high at 16.5 g / m². Due to the uneven arrangement of the heat seal fibers to form places of high and low diffusion, there is also the risk that after the sealing of the tea bag, the seams in the boiling water are less stable than the seams of a bag, which is made of paper with a consistently uniform heat seal layer.

In der DE-PS 2 147 322 wird die Herstellung eines heißsiegelfähigen Papiers beschrieben, das zwischen 14 und 17 g/m² schwer ist und bei dem die heißsiegelfähigen Fasern bzw. Teilchen bevorzugt auf einer Seite der Papieroberfläche konzentriert sind. Wenn aber die heißsiegelfähige Schicht bevorzugt nur auf einer Seite des Papiers liegt und dann während des Trocknungsprozesses auf der Papiermaschine verschmolzen wird, schließt sie die poröse Grundschicht ab und verhindert eine gute Teediffusion.DE-PS 2 147 322 describes the production of a heat-sealable paper which weighs between 14 and 17 g / m 2 and in which the heat-sealable fibers or particles are preferably concentrated on one side of the paper surface. However, if the heat-sealable layer is preferably only on one side of the paper and is then melted on the paper machine during the drying process, it closes off the porous base layer and prevents good tea diffusion.

In der DE-PS 1 546 330 wird ein Verfahren beschrieben, in dem die thermoplastischen Fasern und die nicht-heißsiegelfähigen Fasern in einer wässrigen Suspension gemeinsam auf das Sieb in einer Papiermaschine abgelagert werden. Aufgrund der Eigenschaft der geringeren Dichte der aus Polypropylen bestehenden thermoplastischen Fasern wird an den beiden Oberflächen des gebildeten Papiers ein unterschiedlicher Gehalt an Polypropylen-Fasern abgeschieden. Damit gelten auch dort die oben bereits genannten Nachteile von einseitig siegelbaren Papieren. Beschrieben wird dieses Verfahren für ein Papier von 17g/m².DE-PS 1 546 330 describes a method in which the thermoplastic fibers and the non-heat-sealable fibers are deposited together in an aqueous suspension onto the screen in a paper machine. Due to the property of the lower density of the thermoplastic fibers made of polypropylene, a different content of polypropylene fibers is deposited on the two surfaces of the paper formed. The above-mentioned disadvantages of paper that can be sealed on one side also apply there. This process is described for a paper of 17 g / m².

Bekannt sind des weiteren heißsiegelfähige Teebeutelpapiere mit einer sogenannten offenen Struktur, bei denen in regelmäßigen Abständen Öffnungen verschiedener Größe und Form durch verschiedene Verfahren in das Papier gebracht werden. Dies soll eine Verbesserung der Teediffusion bewirken, was jedoch nicht ohne weiteres eintritt. Durch diese offene Struktur im Papier ist jedoch die Anwendung als Teebeutelpapier sehr begrenzt, da zuviel staubförmiges Material durch das Papier hindurchfällt. Diese sog. offenen Papiere werden alle in einer Gewichtsklasse oberhalb von 16g/m² produziert.Also known are heat-sealable tea bag papers with a so-called open structure, in which openings of different sizes and shapes are introduced into the paper at regular intervals by various methods. This is said to improve tea diffusion, but this does not happen easily. Due to this open structure in the paper, however, the use as tea bag paper is very limited, since too much dust-like material falls through the paper. These so-called open papers are all produced in a weight class above 16g / m².

Alle diese bekannten heißsiegelfähigen Teebeutelpapiere haben gemeinsam, daß sie aufgrund ihres recht hohen Flächengewichtes und des hohen Anteils an synthetischen Fasern eine schlechtere Teediffusion aufweisen als die bekannten, leichten, nicht heißsiegelfähigen Materialien mit einem Gewicht von etwa 12 g/m². Diese bekannten, aus nur einer Phase bestehenden Teebeutelpapiere können jedoch nur mit einem recht komplizierten Faltungsprozeß auf Abpackmaschinen und nur bis zu einer maximalen Taktzahl von ca. 230 Beutel/Minute verarbeitet werden.All these known heat sealable tea bag papers have in common that due to their quite high basis weight and the high proportion of synthetic fibers they have a poorer tea diffusion than the known, light, non heat sealable materials with a weight of about 12 g / m 2. This well-known, from just one However, existing tea bag papers can only be processed with a very complicated folding process on packaging machines and only up to a maximum cycle rate of approx. 230 bags / minute.

Ziel der Erfindung ist es, ein leichtgewichtiges heißsiegelfähiges Teebeutelpapier zu schaffen, das gegenüber den herkömmlichen heißsiegelfähigen Papieren eine wesentlich verbesserte Teediffusion hat und auf schnellaufenden Teebeutel-Herstellungsmaschinen verarbeitet werden kann, die im besonderen eine doppelseitige Siegelung des Papieres verlangen. Außerdem soll ein Verfahren zur Herstellung eines solchen Teebeutelpapiers angegeben werden.The aim of the invention is to provide a lightweight heat-sealable tea bag paper which has a significantly improved tea diffusion compared to conventional heat-sealable papers and can be processed on high-speed tea bag manufacturing machines which in particular require a double-sided sealing of the paper. In addition, a method for producing such a teabag paper is to be specified.

Die erstgenannte Aufgabe wird erfindungsgemäß mit einem Teebeutelpapier gelöst, bei dem die erste Phase mit einem Gewichtsanteil von 60 - 85% von der zweiten Phase mit dem restlichen Gewichtsanteil von 15 - 40% derart durchdrungen ist und die Naturfasern von den geschmolzenen und wiederverfestigten synthetischen Fasern derart umhüllt sind, daß beide Seiten des Papiers heißsiegelbar sind, wobei das Flächengewicht des Papiers zwischen 10 und 15 g/m², vorzugsweise bei 12 g/m², liegt. In einer bevorzugten Ausführungsform besteht die erste Phase aus Naturfasern mit einem Flächengewicht von 8,5 - 9,7 g/m² und die zweite Phase aus synthetischen Fasern mit einem Flächengewicht von 3,1 - 4,0 g/m².The first-mentioned object is achieved according to the invention with a teabag paper in which the first phase with a weight fraction of 60-85% is permeated by the second phase with the remaining weight fraction of 15-40% and the natural fibers are melted and resolidified synthetic fibers in this way are coated so that both sides of the paper are heat-sealable, the basis weight of the paper being between 10 and 15 g / m², preferably 12 g / m². In a preferred embodiment, the first phase consists of natural fibers with a basis weight of 8.5-9.7 g / m² and the second phase consists of synthetic fibers with a basis weight of 3.1-4.0 g / m².

Bezüglich des Herstellungsverfahrens wird die Aufgabe der Erfindung dadurch gelöst, daß in einer Stufe eine wässrige Suspension der Naturfasern mit einer Stoffdichte von weniger als 0,1 % auf ein Papiermaschinensieb zur Bildung einer ersten Schicht aufgebracht wird, daß in einer zweiten Stufe die heißsiegelfähigen synthetischen Fasern auf der ersten Schicht derart abgelagert werden, daß sie die erste Schicht durchdringen, wobei die Durchdringung der Schichten durch die Entwässerung eingestellt wird, und daß durch einen nachfolgenden Trocknungsprozeß die synthetischen Fasern aufgeschmolzen werden, derart, daß sie bei der Wiederverfestigung die Naturfasern umhüllen. Die Durchdringung der beiden Schichten kann dabei durch scharfe Entwässerung besonders verstärkt werden.With regard to the manufacturing process, the object of the invention is achieved in that in one step an aqueous suspension of the natural fibers with a consistency of less than 0.1% is applied to a paper machine screen to form a first layer, that in a second step the heat-sealable synthetic fibers are deposited on the first layer in such a way that they penetrate the first layer, the penetration of the layers being stopped by the drainage, and that the synthetic fibers are subjected to a subsequent drying process are melted in such a way that they envelop the natural fibers during re-consolidation. The penetration of the two layers can be particularly enhanced by sharp drainage.

Für die erste Schicht werden bekannte Naturfasern, wie Hanf, Manila, Jute, Sisal und andere sowie langfaseriger Holzzellstoff verwendet. Für die zweite Schicht aus heißsiegelfähigen Fasern werden bevorzugt Polyethylen, Polypropylen oder Mischpolymerisate aus Vinylchlorid und Vinylacetat verwendet.Well-known natural fibers such as hemp, manila, jute, sisal and other long-fiber wood pulp are used for the first layer. Polyethylene, polypropylene or copolymers of vinyl chloride and vinyl acetate are preferably used for the second layer of heat-sealable fibers.

Beim Herstellungsvorgang durchdringen die synthetischen Heißsiegelfasern der zweiten Phase die erste Phase und umhüllen bei dem Trocknungsprozeß auf der Papiermaschine im geschmolzenen Zustand die Naturfasern. Dabei lassen sie die notwendigen Poren im Material frei. Somit wird bei dem erfindungsgemäßen Material die Teediffusion nicht verschlechtert. Außerdem kann das erfindungsgemäße Material auf beiden Seiten heißgesiegelt werden, was ebenfalls durch den Durchtritt der zweiten Phase durch die nichtsiegelnde erste Phase gewährleistet wird.During the manufacturing process, the synthetic heat seal fibers of the second phase penetrate the first phase and envelop the natural fibers in the melted state during the drying process on the paper machine. They leave the necessary pores in the material free. Thus, the tea diffusion is not deteriorated in the material according to the invention. In addition, the material according to the invention can be heat-sealed on both sides, which is also ensured by the passage of the second phase through the non-sealing first phase.

Die Erfindung wird nachfolgend anhand der Zeichnung an einem Ausführungsbeispiel näher erläutert. Dabei zeigen:

Fig. 1
die verschiedenen Stadien bei der Bildung des erfindungsgemäßen Teebeutelpapiers aus Naturfasern und synthetischen Fasern in einer allgemeinen, grob schematischen Darstellung, und
Fig. 2
den prinzipiellen, ebenfalls nur grob schematisch gezeigten Aufbau einer Anlage für die Durchführung des erfindungsgemäßen Verfahrens.
The invention is explained in more detail below with reference to the drawing using an exemplary embodiment. Show:
Fig. 1
the various stages in the formation of the teabag paper according to the invention from natural fibers and synthetic fibers in a general, roughly schematic representation, and
Fig. 2
the basic structure of a system for carrying out the method according to the invention, also shown only roughly schematically.

In Fig. 1 ist in einer schematischen Darstellung die Bildung des erfindungsgemäßen Teebeutelpapiers gezeigt. Dabei ist in Fig. 1a) die Bildung einer ersten Faserschicht aus Naturfasern 1 und die Bildung einer zweiten Faserschicht aus synthetischen, heißsiegelbaren Fasern 2 dargestellt. Die Bildung der zweiten Schicht mit den Fasern 2 erfolgt also durch Ablagerung über der ersten Schicht, welche durch die Naturfasern 1 gebildet ist. In der Zeichnung sind zur Unterscheidung die Naturfasern 1 waagerecht schraffiert, während die synthetischen Fasern 2 annähernd senkrecht schraffiert wurden.In Fig. 1, the formation of the tea bag paper according to the invention is shown in a schematic representation. 1a) shows the formation of a first fiber layer from natural fibers 1 and the formation of a second fiber layer from synthetic, heat-sealable fibers 2. The formation of the second layer with the fibers 2 thus takes place by deposition over the first layer, which is formed by the natural fibers 1. In the drawing, the natural fibers 1 are hatched horizontally to distinguish them, while the synthetic fibers 2 are hatched approximately vertically.

Fig. 1b) zeigt, wie durch die beschriebene scharfe Entwässerung der beiden Schichten, insbesondere der zweiten Schicht mit den Fasern 2, eine Durchdringung der beiden Schichten erzielt wird, so daß die synthetischen Fasern 2 zwischen die Naturfasern 1 gelangen und sich von der Oberseite der ersten Schicht bis hin zu deren Unterseite zwischen den Naturfasern 1 befinden.Fig. 1b) shows how through the described sharp drainage of the two layers, in particular the second layer with the fibers 2, a penetration of the two layers is achieved so that the synthetic fibers 2 get between the natural fibers 1 and from the top of the first layer down to the bottom between the natural fibers 1.

In einem weiteren Herstellungsschritt werden die einander durchdringenden Schichten 1 und 2 getrocknet und dabei derart erhitzt, daß die synthetischen Fasern 2 schmelzen und sich bei der Wiederverfestigung so um die Fasern 1 legen, daß diese zumindest teilweise umhüllt werden. Auf diese Weise ist das fertige Teebeutelpapier auf beiden Seiten heiß-siegelbar. (Fig. 1c)).In a further production step, the interpenetrating layers 1 and 2 are dried and heated in such a way that the synthetic fibers 2 melt and are thus wrapped around the fibers 1 during consolidation. that these are at least partially covered. In this way, the finished tea bag paper can be heat-sealed on both sides. (Fig. 1c)).

Fig. 2 zeigt den grundsätzlichen Aufbau einer Papiermaschine, wie sie zur Herstellung eines erfindungsgemäßen Teebeutelpapieres verwendet werden kann. Zunächst wird aus den gemahlenen Naturfasern und Wasser eine Suspension "A" gebildet, außerdem aus den zum Teil gemahlenen synthetischen Fasern und Wasser eine Suspension "B".Fig. 2 shows the basic structure of a paper machine, as it can be used to produce a tea bag paper according to the invention. First, a suspension "A" is formed from the ground natural fibers and water, and also a suspension "B" from the partially ground synthetic fibers and water.

Diese beiden Suspensionen A und B werden aus den jeweiligen Behältern (3 und 4) über den sogenannten Stoffauflauf (head box) der Papiermaschine zugeführt. Diese besitzt im wesentlichen ein umlaufendes Sieb (5), welches über eine Anzahl von Entwässerungskammern (6, 7 und 8) hinweggeführt wird.These two suspensions A and B are fed from the respective containers (3 and 4) via the so-called headbox to the paper machine. This essentially has a peripheral sieve (5) which is passed over a number of dewatering chambers (6, 7 and 8).

Über geeignete Rohrleitungen und Pumpvorrichtungen, die nicht näher dargestellt sind, wird die Suspension A auf das Sieb 5 über den ersten beiden Entwässerungskammern 6 geleitet, wobei durch die Kammern 6 und die Entwässerungsleitung das Wasser abgesaugt wird. Dabei bildet sich auf dem bewegten Sieb 5 eine erste Faserschicht aus den Naturfasern 1. Bei der Weiterbewegung des Siebes 5 über die Entwässerungskammern 7 wird die zweite Suspension B zugeführt, wobei über den Entwässerungskammern 7 eine zweite Schicht aus synthetischen Fasern auf der ersten Schicht abgelagert wird. Die Entwässerung erfolgt dabei über die Entwässerungsleitung . Bei der Weiterbewegung des Siebes 5 mit den beiden aufeinanderliegenden Faserschichten wird über die Entwässerungskammern 8 eine scharfe Entwässerung vorgenommen, wodurch die beiden Schichten einander durchdringen. Durch entsprechende Einstellung der Entwässerung kann die Durchdringung mehr oder weniger stark erzielt werden.The suspension A is passed onto the sieve 5 via the first two dewatering chambers 6 via suitable pipelines and pump devices, which are not shown in more detail, the water being sucked off through the chambers 6 and the dewatering line. A first fiber layer of natural fibers 1 is formed on the moving sieve 5. When the sieve 5 moves further over the dewatering chambers 7, the second suspension B is supplied, a second layer of synthetic fibers being deposited over the dewatering chambers 7 on the first layer . The drainage takes place via the drainage line. When the screen 5 with the two fiber layers lying one on top of the other moves sharply through the dewatering chambers 8, the two layers penetrate one another. The penetration can be achieved more or less by adjusting the drainage accordingly.

Das nunmehr gebildete Material 9 aus Naturfasern und synthetischen Fasern wird von dem Sieb abgenommen und einer Trocknung zugeführt. Diese Trocknung kann auf verschiedene Art und Weise erfolgen, z.B. durch Kontakttrocknung oder Durchströmtrocknung.The material 9 now formed from natural fibers and synthetic fibers is removed from the sieve and fed to drying. This drying can be done in different ways, e.g. by contact drying or through-flow drying.

Die Elemente 10 geben nur grob schematisch den Hinweis auf entsprechende Trocknungselemente.The elements 10 only give a rough schematic indication of corresponding drying elements.

In Fig. 2 sind 3 Trockenzylinder 10 gezeichnet, über die die geformte Papierbahn im Kontaktverfahren getrocknet wird. Es ist jedoch auch praktikabel, die gebildete Papierbahn nur über einen Zylinder zu führen und sie mit heißer Luft zu trocknen, ohne daß die Bahn auf diesem Zylinder aufliegt.In Fig. 2 3 drying cylinders 10 are drawn, over which the shaped paper web is dried in the contact process. However, it is also practical to pass the paper web formed over only one cylinder and to dry it with hot air without the web resting on this cylinder.

Die Erwärmung des zweischichtigen Fasermaterials bringt die synthetischen Fasern 2 in der Mischschicht 9 zum Schmelzen. Bei der Wiederverfestigung am Ausgang der Trockenstation umhüllen die synthetischen Fasern zumindest teilweise die Naturfasern, so daß das auf eine Rolle 11 aufgerollte Teebeutelpapier beidseitig heißsiegelbar ist.The heating of the two-layer fiber material causes the synthetic fibers 2 in the mixed layer 9 to melt. During re-consolidation at the exit of the drying station, the synthetic fibers at least partially envelop the natural fibers, so that the tea bag paper rolled up on a roll 11 can be heat-sealed on both sides.

Die verbesserten Eigenschaften des erfindungsgemäßen Teebeutelpapiers seien nachfolgend an einem Beispiel im Vergleich zu herkömmlichen Materialien aufgezeigt. Verglichen wurde dabei ein erfindungsgemäßes Teebeutelpapier (Muster A) mit einem herkömmlichen heißsiegelfähigen Teebeutelpapier (Muster B) und einem herkömmlichen nicht-heißsiegelfähigen Teebeutelpapier (Muster C). An diesen drei Materialien wurden folgende Eigenschaften ermittelt: Tabelle A B C Flächengewicht [g/m²] 12,2 16,5 12,3 Zeit der 1. Farbentwicklung [sec.] 8,9 11,8 9,7 Teediffusionsfaktor (Dichte x Luftwiderstand) 1,71 3,59 1,86 Bei Muster A handelt es sich um den Gegenstand der Erfindung,
bei Muster B um herkömmliche bekannte heißsiegelfähige Teebeutelpapiere,
bei Muster C um nichtheißsiegelfähige Teebeutelpapiere. The improved properties of the tea bag paper according to the invention are shown below using an example compared to conventional materials. A tea bag paper according to the invention (sample A) was compared with a conventional heat-sealable tea bag paper (sample B) and a conventional non-heat-sealable tea bag paper (sample C). The following properties were determined on these three materials: table A B C. Basis weight [g / m²] 12.2 16.5 12.3 Time of first color development [sec.] 8.9 11.8 9.7 Tea diffusion factor (density x air resistance) 1.71 3.59 1.86 Pattern A is the subject of the invention,
for pattern B around conventional known heat sealable tea bag papers,
for pattern C around non-heat-sealable teabag papers.

Erläuterung zu der Tabelle:Explanation of the table: Zeit der ersten Farbentwicklung:Time of first color development:

Es wurden aus den unterschiedlichen Papieren nach Muster A, Muster B und Muster C jeweils exakt formgleiche Teebeutel gefertigt, die mit der genauen Menge eines herkömmlichen Tees gefüllt wurden. Die Menge betrug ca. 5 g/Beutel. Nach dem Eintauchen der einzelnen Teebeutel in kochendes Wasser wurde die Zeit bestimmt, in der die ersten Farbschlieren aus dem Beutel sichtbar wurden. Diese Zeit ist ein Maß, wie schnell aus den Teebeuteln mit den unterschiedlichen Materialien die geschmacks- und farbestimmenden Bestandteile des Tees herausgelöst werden.Exactly the same shape tea bags were made from the different papers according to pattern A, pattern B and pattern C, which were filled with the exact amount of a conventional tea. The amount was about 5 g / bag. After immersing the individual tea bags in boiling water, the time was determined in which the first streaks of color were visible from the bag. This time is a measure of how quickly the flavor and color-determining components of the tea are extracted from the tea bags with the different materials.

Teediffusionsfaktor:Tea diffusion factor:

Während es sich bei der Bestimmung der oben genannten Zeit für die erste Farbentwicklung um eine experimentelle Methode handelt, ist der Teediffusionsfaktor eine rechnerische Größe. Geringste Rohdichte und hohe Porosität (niedriger Luftwiderstand) bestimmen die Geschwindigkeit, mit der die Teeauslaugung aus einem Beutel erfolgt. Wenn also das Produkt aus Rohdichte und Luftwiderstand so klein wie möglich ist, sind die Voraussetzungen für eine gute Teeauslaugung oder Teediffusion gegeben.While the determination of the above-mentioned time for the first color development is an experimental method, the tea diffusion factor is a calculated quantity. The lowest bulk density and high porosity (low air resistance) determine the speed at which tea leaching takes place from a bag. So if the product from bulk density and air resistance is as small as possible, the prerequisites for good tea leaching or tea diffusion are given.

Die Rohdichte ist der bekannte Quotient aus dem Flächengewicht und der Dicke. Der Luftwiderstand wird in Sekunden angegeben und dadurch bestimmt, daß die Zeit gemessen wird, in der ein festgelegtes Luftvolumen durch eine definierte Fläche des zu prüfenden Papieres hindurchströmt (s. auch Gurley-Messung).The bulk density is the known quotient of the basis weight and the thickness. The air resistance is specified in seconds and is determined by measuring the time in which a fixed volume of air flows through a defined area of the paper to be tested (see also Gurley measurement).

Wie man aus obiger Tabelle klar ersieht, sind sowohl die Zeit der ersten Farbentwicklung als auch der Teediffusionsfaktor beim Muster A, also bei dem erfindungsgemäßen Material, am besten. Dieses Material besitzt somit eine ebenso gute, sogar etwas bessere Teediffusion wie die herkömmlichen nicht-heißsiegelfähigen Papiere, ist aber auf speziellen schnellen Teeabpack-Automaten verarbeitbar.As can be clearly seen from the above table, both the time of the first color development and the tea diffusion factor are best for sample A, that is to say for the material according to the invention. This material thus has just as good, even slightly better tea diffusion as the conventional non-heat-sealable papers, but can be processed on special fast tea packaging machines.

Claims (8)

  1. Tea bag paper consisting of a first phase of natural fibres and a second phase of heat-sealing synthetic fibres, characterized in that the first phase, which accounts for from 60 to 85% of the weight, is interspersed by the second phase, which accounts for the other 15 to 40% of the weight, in such a way and the natural fibres have been enveloped by the molten and resolidified synthetic fibres in such a way that both sides of the paper are heat-sealable and in that the basis weight of the paper is between 10 and 15 g/m².
  2. Tea bag paper according to Claim 1, characterized in that the basis weight of the paper is about 12 g/m².
  3. Tea bag paper according to Claim 1 or 2, characterized in that the first phase consists of natural fibres having a basis weight of 8.5-9.7 g/m² and the second phase consists of synthetic fibres having a basis weight of 3.1-4.0 g/m².
  4. Tea bag paper according to anyone of Claims 1 to 3, characterized in that the first phase contains one or more of hemp, manila, jute, sisal and long-fibre wood pulp.
  5. Tea bag paper according to any one of Claims 1 to 4, characterized in that the second phase contains polyethylene and/or polypropylene and/or a copolymer of vinyl chloride and vinyl acetate.
  6. Process for producing a tea bag paper according to any one of Claims 1 to 5, characterized in that in a first stage an aqueous suspension of the natural fibres having a stock consistency of less than 0.1% is applied to a paper machine wire to form a first layer, in a second stage the heat-sealable synthetic fibres are deposited on the first layer in such a way that they intersperse the first layer, the degree of interspersion of the layers being controlled by the rate of drainage, and
    a subsequent drying process melts the synthetic fibres in such a way that, as they resolidify, they envelop the natural fibres.
  7. Process according to Claim 6, characterized in that the degree of interspersion of the two layers is enhanced by rapid drainage.
  8. Use of the tea bag paper according to any one of Claims 1 to 5 for making tea bags.
EP90101601A 1989-01-26 1990-01-26 Thermosealing paper for tea bags, and process for making the same Expired - Lifetime EP0380127B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90101601T ATE98720T1 (en) 1989-01-26 1990-01-26 HEAT-SEALABLE TEA BAG PAPER AND METHOD OF PRODUCTION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3902298 1989-01-26
DE3902298A DE3902298C1 (en) 1989-01-26 1989-01-26

Publications (3)

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EP0380127A2 EP0380127A2 (en) 1990-08-01
EP0380127A3 EP0380127A3 (en) 1991-08-21
EP0380127B1 true EP0380127B1 (en) 1993-12-15

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EP90101601A Expired - Lifetime EP0380127B1 (en) 1989-01-26 1990-01-26 Thermosealing paper for tea bags, and process for making the same

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EP (1) EP0380127B1 (en)
AT (1) ATE98720T1 (en)
DE (2) DE3902298C1 (en)
ES (1) ES2048329T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6784126B2 (en) 1990-12-21 2004-08-31 Kimberly-Clark Worldwide, Inc. High pulp content nonwoven composite fabric
US5573841A (en) * 1994-04-04 1996-11-12 Kimberly-Clark Corporation Hydraulically entangled, autogenous-bonding, nonwoven composite fabric
DE19719807A1 (en) * 1997-05-13 1998-11-19 Bayer Ag Heat sealable filter material with biodegradable polymers
DE10206924B4 (en) 2002-02-19 2005-12-15 Papierfabrik Schoeller & Hoesch Gmbh & Co. Kg Heat-sealable filter materials
DE10231403B3 (en) 2002-07-11 2004-02-05 Papierfabrik Schoeller & Hoesch Gmbh & Co. Kg Heat sealable filter material
GB2403719A (en) 2003-07-07 2005-01-12 Reckitt Benckiser Nv Water-softening method
DE102018107944B3 (en) * 2018-04-04 2019-06-19 Delfortgroup Ag IMPROVED FILTER PAPER, MANUFACTURING METHOD AND BAG OBTAINED THEREFROM

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1294064A (en) * 1970-09-23 1972-10-25 Dexter Corp Heat-sealant particles and web materials containing same
GB1411776A (en) * 1972-11-21 1975-10-29 Mitsubishi Paper Mills Ltd Method for producing a non-woven fabric
US4289580A (en) * 1979-11-13 1981-09-15 The Dexter Corporation Heat seal fibrous web and method of its manufacture
JPS6355074A (en) * 1986-08-18 1988-03-09 旭化成株式会社 Filter for tea bag
JPS63159599A (en) * 1986-12-23 1988-07-02 株式会社クラレ Thin paper for tea bag

Also Published As

Publication number Publication date
DE59003814D1 (en) 1994-01-27
ATE98720T1 (en) 1994-01-15
DE3902298C1 (en) 1990-08-23
ES2048329T3 (en) 1994-03-16
EP0380127A3 (en) 1991-08-21
EP0380127A2 (en) 1990-08-01

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