EP0101082A1 - Plastic film - Google Patents

Plastic film Download PDF

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Publication number
EP0101082A1
EP0101082A1 EP83107987A EP83107987A EP0101082A1 EP 0101082 A1 EP0101082 A1 EP 0101082A1 EP 83107987 A EP83107987 A EP 83107987A EP 83107987 A EP83107987 A EP 83107987A EP 0101082 A1 EP0101082 A1 EP 0101082A1
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EP
European Patent Office
Prior art keywords
plastic film
openings
tea
film
thermoplastic material
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.)
Ceased
Application number
EP83107987A
Other languages
German (de)
French (fr)
Inventor
Arie Heij
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.)
Unilever PLC
Unilever NV
Original Assignee
Unilever PLC
Unilever NV
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Filing date
Publication date
Application filed by Unilever PLC, Unilever NV filed Critical Unilever PLC
Publication of EP0101082A1 publication Critical patent/EP0101082A1/en
Ceased 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

Definitions

  • the invention relates to a plastic film, in particular for the production of liquid-permeable bags or the like. With finely divided openings.
  • the invention has for its object to provide a plastic film which is suitable for producing such bags for a wide variety of uses.
  • the size of the openings is between -90 and 110 ⁇ m and the number of openings is 900 to 1200 per square centimeter.
  • This configuration ensures that, on the one hand, sufficient water can penetrate the bag, and on the other hand, the often very small tea particles cannot escape from the bag.
  • thermoplastic material which softens at a temperature of 115 to 140 ° C. Both the plastic film and the bag can be produced relatively easily from this material.
  • thermoplastic material there is no risk of softening the thermoplastic material at the temperatures that occur when the bags are used.
  • thermoplastic material of the film softens at a temperature of 120 to 130 ° C.
  • thermoplastic material of the plastic film is polyethylene or a copolymer of ethylene.
  • thermoplastic material of the film is a polyethylene of medium to high density and high molecular weight.
  • a plastic film was produced from a low-pressure polyethylene of high density (density at 23 ° C 0.953 g per cm 3 ; melt index (190/5): 1.2 g / 10 min .; reduced specific viscosity in decaline at 135 ° C: 2, 7dl / g).
  • the film thickness was between 10 and 12 ⁇ m and the average hole size was 100 ⁇ m; the number of holes was 1024 per cm 2 , while the surface area of the openings was 6.4% of the total film surface.
  • the liquid permeability was compared to a commercially available paper tea bag with the same dimensions and the same tea content.
  • the liquid permeability of the plastic film bag was much better than that of the commercially available paper tea bag.
  • the amount of tea components dissolved was The amount of fine particles of tea allowed through was less than or at most equal to the amount that the paper bag let through.
  • the plastic film was made from the same polyethylene as in Example 1, but with a film thickness of 12 ⁇ m; the average hole size was 169 ⁇ m and the number of openings was 400 per square centimeter. The area of all openings was 6.5% of the total surface of the plastic film.
  • Example 2 The test was carried out in the same manner as in Example 1. The amount of tea components dissolved was conventional tea bags.
  • Example 2 a plastic film was used as in Example 1, the thickness of which was 12 ⁇ m.
  • the average size of the openings was below 75 pm (65% of the openings were between 35 and 65 ⁇ m and 17% were between 10 and 20 ⁇ m).
  • the number of openings was 991 per square centimeter, the area of the openings being 4.1% based on the total surface of the plastic film.
  • a plastic film according to Example 1 was also used in this example.
  • the thickness was again between 10 and 12 ⁇ m, while the average size of the openings was 93 ⁇ m and the number of openings per square centimeter was 992. This resulted in an area of all openings of 8.5% of the total area of the plastic film.
  • tea bags of size 5.4 x 6.3 cm would again be made by heat sealing and each filled with 2 g of tea.
  • the amount of tea parts removed was here paper teabags. Dabe.i, the permeability of solid tea components was equal to or less than that of the paper bag compared.

Abstract

The plastic film has openings for allowing liquid to pass through. A film of this type is intended especially for the manufacture of teabags instead of the previously customary bags made of paper. The film has particular properties and dimensions, which make it particularly suitable for this purpose.

Description

Die Erfindung betrifft einen Kunststoff-Film, insbesondere für die Herstellung von flüssigkeitsdurchlässigen Beuteln oder dgl. mit feinverteilten Öffnungen.The invention relates to a plastic film, in particular for the production of liquid-permeable bags or the like. With finely divided openings.

Bisher wurde für derartige flüssigkeitsdurchlässige Beutel in erster Linie Papier verwendet, da Versuche mit anderen Materialien nicht befriedigt haben.Until now, paper has primarily been used for such liquid-permeable bags, since attempts with other materials have not been satisfactory.

Der Erfindung liegt die Aufgabe zugrunde, einen Kunststoff-Film zu schaffen, der zur Herstellung solcher Beutel für unterschiedlichste Einsatzzwecke geeignet ist.The invention has for its object to provide a plastic film which is suitable for producing such bags for a wide variety of uses.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Film folgende Merkmale enthält:

  • a) Stärke des Kunststoff-Films 8 bis 25 µm
  • b) durchschnittliche Größe der öffnungen 30 bis 120 pm
  • c) Anzahl der Öffnungen 700 bis 2000 pro cm2 Filmfläche
  • d) Gesamtfläche der Öffnungen etwa 5 bis 15% der Kunststoff-Film-Fläche.
This object is achieved in that the film contains the following features:
  • a) thickness of the plastic film 8 to 25 microns
  • b) average size of openings 30 to 120 pm
  • c) Number of openings 700 to 2000 per cm 2 film area
  • d) total area of the openings about 5 to 15% of the plastic film area.

Durch diese Merkmale ist gewährleistet, daß einerseits genügend Flüssigkeit durch den Kunststoff-Film durchtreten kann, andererseits aber die in dem Beutel befindliche, mit der Flüssigkeit in Kontakt zu bringende Masse nicht durch die Öffnungen austreten kann.These features ensure that on the one hand enough liquid can pass through the plastic film, but on the other hand that the mass in the bag that is to be brought into contact with the liquid cannot escape through the openings.

Bei einem Kunststoff-Film für die Herstellung von Teebeuteln ist es sehr vorteilhaft, wenn erfindungsgemäß die Größe der Öffnungen zwischen-90 und 110 µm und die Anzahl der Öffnungen 900 bis 1200 pro Quadratzentimeter beträgt.In the case of a plastic film for the production of tea bags, it is very advantageous if, according to the invention, the size of the openings is between -90 and 110 μm and the number of openings is 900 to 1200 per square centimeter.

Durch diese Ausgestaltung ist gewährleistet, daß einerseits genügend Wasser in den Beutel eindringen kann, andererseits die oft sehr kleinen Teeteilchen nicht aus dem Beutel austreten können.This configuration ensures that, on the one hand, sufficient water can penetrate the bag, and on the other hand, the often very small tea particles cannot escape from the bag.

Sehr vorteilhaft ist es auch, wenn gemäß der Erfindung ein thermoplastisches Material verwendet ist, das bei einer Temperatur von 115 bis 140 °C erweicht. Aus diesem Material läßt sich sowohl der Kunststoff-Film als auch der Beutel verhältnismäßig leicht herstellen.It is also very advantageous if, according to the invention, a thermoplastic material is used which softens at a temperature of 115 to 140 ° C. Both the plastic film and the bag can be produced relatively easily from this material.

Andererseits besteht bei den bei der Verwendung der Beutel auftretenden Temperaturen keine Gefahr der Erweichung des thermoplastischen Materials.On the other hand, there is no risk of softening the thermoplastic material at the temperatures that occur when the bags are used.

Bei einer bevorzugten Ausführung der Erfindung erweicht das thermoplastische Material des Films bei einer Temperatur von 120 bis 130 °C.In a preferred embodiment of the invention, the thermoplastic material of the film softens at a temperature of 120 to 130 ° C.

Ebenfalls sehr vorteilhaft - insbesondere bei Verwendung für Teebeutel - ist es, wenn erfindungsgemäß das thermoplastische Material des Kunststoff-Films Polyäthylen oder ein Copolymer von Äthylen ist.It is also very advantageous - especially when used for tea bags - if, according to the invention, the thermoplastic material of the plastic film is polyethylene or a copolymer of ethylene.

Erfindungsgemäß ist es auch vorteilhaft, wenn das thermoplastische Material des Films ein Polyäthylen mittlerer bis hoher Dichte und hohem Molekulargewicht ist.According to the invention, it is also advantageous if the thermoplastic material of the film is a polyethylene of medium to high density and high molecular weight.

Die Erfindung wird nachstehend anhand von zwei Ausführungsbeispielen veranschaulicht:The invention is illustrated below using two exemplary embodiments:

Beispiel 1example 1

Ein Kunststoff-Film wurde aus einem Niederdruckpolyäthylen hoher Dichte hergestellt (Dichte bei 23 °C 0,953g pro cm3; Schmelzindex (190/5): 1,2g/10 min.; reduzierte spezifische Viskosität in decaline bei 135 °C: 2,7dl/g). Die Filmdicke betrug zwischen 10 und 12 µm und die durchschnittliche Lochgröße war 100 um; die Anzahl der Löcher betrug 1024 pro cm2, während die Oberfläche der Öffnungen 6.4% der gesamten Filmoberfläche ausmachte.A plastic film was produced from a low-pressure polyethylene of high density (density at 23 ° C 0.953 g per cm 3 ; melt index (190/5): 1.2 g / 10 min .; reduced specific viscosity in decaline at 135 ° C: 2, 7dl / g). The film thickness was between 10 and 12 µm and the average hole size was 100 µm; the number of holes was 1024 per cm 2 , while the surface area of the openings was 6.4% of the total film surface.

Aus dieser gelochten Folie wurden Teebeutel in der Größe 5,4 cm x 6,3 cm durch Heißsiegeln hergestellt, in welche jeweils 2g Tee einer Standard-Marke eingefüllt wurden.5.4 cm x 6.3 cm tea bags were produced from this perforated film by heat sealing, into each of which 2 g of tea of a standard brand were filled.

Die Flüssigkeitsdurchlässigkeit wurde verglichen mit einem im Handel erhältlichen Teebeutel aus üblichem Papier mit den gleichen Abmessungen und dem gleichen Teeinhalt.The liquid permeability was compared to a commercially available paper tea bag with the same dimensions and the same tea content.

In beiden Fällen wurde eine Methode angewandt, wie sie in ISO 1574 - 1980 (E) beschrieben ist, nur mit dem Unterschied, daß Tee in die Teebeutel eingefüllt war.In both cases a method as described in ISO 1574 - 1980 (E) was used, with the only difference that tea was filled into the tea bags.

Die Flüssigkeitsdurchlässigkeit des Beutels aus dem Kunststoff-Film war sehr viel besser als die des im Handel erhältlichen Papier-Teebeutels. Die Menge an gelösten Teebestandteilen war

Figure imgb0001
Dabei war die Menge der durchgelassenen Feinteile des Tees kleiner oder höchstens gleich derjenigen Menge, die der Papierbeutel durchließ.The liquid permeability of the plastic film bag was much better than that of the commercially available paper tea bag. The amount of tea components dissolved was
Figure imgb0001
 The amount of fine particles of tea allowed through was less than or at most equal to the amount that the paper bag let through.

Vergleichsversuch AComparative experiment A

Der Kunststoff-Film wurde aus dem gleichen Polyäthylen hergestellt wie im Beispiel 1, jedoch mit einer Filmstärke von 12µm; die durchschnittliche Lochgröße war 169 µm und die Anzahl der Öffnungen 400 pro Quadratzentimeter. Die Fläche aller öffnungen betrug dabei 6,5% der gesamten Oberfläche des Kunststoff-Films.The plastic film was made from the same polyethylene as in Example 1, but with a film thickness of 12 µm; the average hole size was 169 µm and the number of openings was 400 per square centimeter. The area of all openings was 6.5% of the total surface of the plastic film.

Der Versuch wurde in der gleichen Weise durchgeführt wie beim Beispiel 1. Die Menge an gelös.ten Teebestandteilen war

Figure imgb0002
kömmlichen Teebeutel.The test was carried out in the same manner as in Example 1. The amount of tea components dissolved was
Figure imgb0002
 conventional tea bags.

Dabei war allerdings die Menge der durchgelassenen Feinteile des Tees geringfügig größer als beim Teebeutel aus Papier.However, the amount of fine particles in the tea that passed through was slightly larger than that of the paper tea bag.

Vergleichsversuch BComparative experiment B

Auch hierbei wurde ein Kunststoff-Film wie beim Beispiel 1 verwendet, dessen Dicke 12 pm betrug. Die durchschnittliche Größe der Öffnungen lag unter 75 pm (65% der Öffnungen lagen zwischen 35 und 65 µm und 17% lagen zwischen 10 und 20 µm). Die Anzahl der Öffnungen betrug 991 pro Quadratzentimeter, wobei sich eine Fläche der öffnungen von 4.1% bezogen aüf die Gesamtoberfläche des Kunststoff-Films ergab.Here, too, a plastic film was used as in Example 1, the thickness of which was 12 μm. The average size of the openings was below 75 pm (65% of the openings were between 35 and 65 µm and 17% were between 10 and 20 µm). The number of openings was 991 per square centimeter, the area of the openings being 4.1% based on the total surface of the plastic film.

Dieser Versuch wurde wieder in gleicher Weise wie bei 1) und A) durchgeführt.This experiment was again carried out in the same way as in 1) and A).

Dabei war die gelöste Menge an Teebestandteilen

Figure imgb0003
Teebeutel.The amount of tea components dissolved was there
Figure imgb0003
 Teabag.

Der Teebeutel dieses Versuches konnte daher nicht befriedigen, obwohl die Menge der durchgelassenen festen Teeteile niedrig genug war.The teabag of this experiment was therefore unsatisfactory, although the amount of solid tea parts allowed through was low enough.

Beispiel 2 ;Example 2;

Auch bei diesem Beispiel wurde ein Kunststoff-Film gemäß Beispiel 1 verwendet. Die Dicke betrug wieder zwischen 10 und 12 µm, während die durchschnittliche Größe der Öffnungen 93 µm und die Anzahl der Öffnungen pro Quadratzentimeter 992 betrug. Damit ergab sich eine Fläche aller Öffnungen von 8.5% der Gesamtfläche des Kunststoff-Films.A plastic film according to Example 1 was also used in this example. The thickness was again between 10 and 12 μm, while the average size of the openings was 93 μm and the number of openings per square centimeter was 992. This resulted in an area of all openings of 8.5% of the total area of the plastic film.

Hieraus würden wieder Teebeutel der Größe 5.4 x 6,3 cm durch Heißsiegeln gefertigt und jeder mit 2 g Tee gefüllt.From this, tea bags of size 5.4 x 6.3 cm would again be made by heat sealing and each filled with 2 g of tea.

Die gelöste Menge an Teebestahdteilen war hier

Figure imgb0004
lichen Teebeutel aus Papier. Dabe.i war die Durchlässigkeit fester Teebestandteile gleich oder kleiner als beim verglichenen Papierbeutel.The amount of tea parts removed was here
Figure imgb0004
 paper teabags. Dabe.i, the permeability of solid tea components was equal to or less than that of the paper bag compared.

Claims (6)

1. Kunststoff-Film, insbesondere für die Herstellung von flüssigkeitsdurchlässigen Beuteln oder dgl. mit feinverteilten Öffnungen, gekennzeichnet durch die folgenden Merkmale: a) Stärke des Kunststoff-Films 8 bis 25 pm; b) Durchschnittliche Größe der Öffnungen 30 bis 120 µm; c) Anzahl der Öffnungen 700 bis 2000 pro Quadratzentimeter Filmfläche;- d) Gesamtfläche der Öffnungen etwa 5 bis 15% der Kunststoff-Film-Fläche. 1. Plastic film, in particular for the production of liquid-permeable bags or the like with finely divided openings, characterized by the following features: a) thickness of the plastic film 8 to 25 pm; b) Average size of the openings 30 to 120 microns; c) number of openings 700 to 2000 per square centimeter of film area; d) total area of the openings about 5 to 15% of the plastic film area. 2. Kunststoff-Film nach Anspruch 1, für die Herstellung von Teebeuteln, dadurch gekennzeichnet, daß die Größe der Öffnungen zwischen 90 und 110 pm und die Anzahl der Öffnungen 900 bis 1200 pro Quadratzentimeter beträgt.2. Plastic film according to claim 1, for the production of tea bags, characterized in that the size of the openings between 90 and 110 pm and the number of openings is 900 to 1200 per square centimeter. 3. Kunststoff-Film nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein thermoplastisches Material verwendet ist, das bei einer Temperatur von 115 bis 140 °C erweicht.3. Plastic film according to claim 1 or 2, characterized in that a thermoplastic material is used which softens at a temperature of 115 to 140 ° C. 4. Kunststoff-Film nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das thermoplastische Material des Films bei einer Temperatur von 120 bis 130 °C erweicht.4. Plastic film according to claim 1 or 2, characterized in that the thermoplastic material of the film softens at a temperature of 120 to 130 ° C. 5. Kunststoff-Film nach Anspruch 1,2,3 oder 4, dadurch gekennzeichnet, daß das thermoplastische Material des Kunststoff-Films Polyäthylen oder ein Copolymer von Äthylen ist.5. Plastic film according to claim 1, 2, 3 or 4, characterized in that the thermoplastic material of the plastic film is polyethylene or a copolymer of ethylene. 6. Kunststoff-Film nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das thermoplastische Material des Films ein Polyäthylen mittlerer bis hoher Dichte und hohem Molekulargewicht ist.6. Plastic film according to one of claims 1 to 5, characterized in that the thermoplastic material of the film is a polyethylene of medium to high density and high molecular weight.
EP83107987A 1982-08-18 1983-08-12 Plastic film Ceased EP0101082A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8203234A NL8203234A (en) 1982-08-18 1982-08-18 FILM FITTED WITH MICROPERFORATIONS.
NL8203234 1982-08-18

Publications (1)

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EP0101082A1 true EP0101082A1 (en) 1984-02-22

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EP83107987A Ceased EP0101082A1 (en) 1982-08-18 1983-08-12 Plastic film

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EP (1) EP0101082A1 (en)
JP (1) JPS5953543A (en)
AU (1) AU1800183A (en)
NL (1) NL8203234A (en)
ZA (1) ZA836067B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145499A2 (en) * 1983-12-15 1985-06-19 Ethyl Corporation Infusion bag
EP0145500A2 (en) * 1983-12-15 1985-06-19 Ethyl Corporation Infusion package
EP0155035A1 (en) * 1984-02-24 1985-09-18 Wavin B.V. Plastic bag with venting perforations, closed plastic bag with venting perforations containing filler material and a plastic foil for forming such a bag
US4591523A (en) * 1985-05-31 1986-05-27 The Procter & Gamble Company Apertured macroscopically expanded three-dimensional polymeric web exhibiting breatheability and resistance to fluid transmission
US4681793A (en) * 1985-05-31 1987-07-21 The Procter & Gamble Company Non-occluding, liquid-impervious, composite backsheet for absorptive devices
US4839216A (en) * 1984-02-16 1989-06-13 The Procter & Gamble Company Formed material produced by solid-state formation with a high-pressure liquid stream
WO2008152498A1 (en) * 2007-06-11 2008-12-18 Ima Flavour S.R.L. Single-lobe filter bag for infusion products

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4839076A (en) * 1988-04-07 1989-06-13 The Procter & Gamble Company Pouched through the washer and dryer laundry additive product having at least one wall comprised of finely apertured polymeric film

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1586733A1 (en) * 1967-02-14 1970-05-14 Johnson & Johnson Filter bags and process for their manufacture
FR2243890A1 (en) * 1973-09-19 1975-04-11 Breveteam Sa
FR2255230A1 (en) * 1973-12-22 1975-07-18 Scheuch Kg Sealed plastic bag for foodstuffs - with inner and outer bags welded together along two seams
GB1556614A (en) * 1976-06-11 1979-11-28 Bakelite Xylonite Ltd Bags
DE2830402A1 (en) * 1978-07-11 1980-01-24 Oberschmitten Papierfab Perforated polypropylene or polyethylene film for mfr. of tea bags - by passing plain film between rollers one of which is coated with inorganic hard granulate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1586733A1 (en) * 1967-02-14 1970-05-14 Johnson & Johnson Filter bags and process for their manufacture
FR2243890A1 (en) * 1973-09-19 1975-04-11 Breveteam Sa
FR2255230A1 (en) * 1973-12-22 1975-07-18 Scheuch Kg Sealed plastic bag for foodstuffs - with inner and outer bags welded together along two seams
GB1556614A (en) * 1976-06-11 1979-11-28 Bakelite Xylonite Ltd Bags
DE2830402A1 (en) * 1978-07-11 1980-01-24 Oberschmitten Papierfab Perforated polypropylene or polyethylene film for mfr. of tea bags - by passing plain film between rollers one of which is coated with inorganic hard granulate

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145499A2 (en) * 1983-12-15 1985-06-19 Ethyl Corporation Infusion bag
EP0145500A2 (en) * 1983-12-15 1985-06-19 Ethyl Corporation Infusion package
EP0145499A3 (en) * 1983-12-15 1986-12-30 Ethyl Corporation Infusion bag
EP0145500A3 (en) * 1983-12-15 1987-01-07 Ethyl Corporation Infusion package
US4839216A (en) * 1984-02-16 1989-06-13 The Procter & Gamble Company Formed material produced by solid-state formation with a high-pressure liquid stream
EP0155035A1 (en) * 1984-02-24 1985-09-18 Wavin B.V. Plastic bag with venting perforations, closed plastic bag with venting perforations containing filler material and a plastic foil for forming such a bag
US4591523A (en) * 1985-05-31 1986-05-27 The Procter & Gamble Company Apertured macroscopically expanded three-dimensional polymeric web exhibiting breatheability and resistance to fluid transmission
US4681793A (en) * 1985-05-31 1987-07-21 The Procter & Gamble Company Non-occluding, liquid-impervious, composite backsheet for absorptive devices
WO2008152498A1 (en) * 2007-06-11 2008-12-18 Ima Flavour S.R.L. Single-lobe filter bag for infusion products
US8047360B2 (en) 2007-06-11 2011-11-01 Ima Flavour S.R.L. Single lobe filter bag for infusion products

Also Published As

Publication number Publication date
JPS5953543A (en) 1984-03-28
AU1800183A (en) 1984-02-23
NL8203234A (en) 1984-03-16
ZA836067B (en) 1985-03-27

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