(19) |
|
|
(11) |
EP 0 746 515 B1 |
(12) |
EUROPEAN PATENT SPECIFICATION |
(45) |
Mention of the grant of the patent: |
|
15.12.1999 Bulletin 1999/50 |
(22) |
Date of filing: 20.02.1995 |
|
(86) |
International application number: |
|
PCT/DK9500/071 |
(87) |
International publication number: |
|
WO 9523/100 (31.08.1995 Gazette 1995/37) |
|
(54) |
DISPOSABLE FILTER BAG FOR THE PREPARATION OF EXTRACTION DRINKS SUCH AS TEA
EINWEGFILTERBEUTEL ZUR HERSTELLUNG VON AUFGUSSGETRÄNKEN WIE TEE
SACHET FILTRANT JETABLE DESTINE A DES INFUSIONS TELLES QUE CELLE DU THE
|
(84) |
Designated Contracting States: |
|
AT BE CH DE DK ES FR GB GR IE IT LI NL SE |
(30) |
Priority: |
23.02.1994 DK 22194
|
(43) |
Date of publication of application: |
|
11.12.1996 Bulletin 1996/50 |
(73) |
Proprietors: |
|
- UNIGREEN INTERNATIONAL A/S
DK-2950 Vedbaek (DK)
- VANGEDAL-NIELSEN, Erling
2950 Vedbaek (DK)
|
|
(72) |
Inventor: |
|
- VANGEDAL-NIELSEN, Erling
DK-2950 Vedbaek (DK)
|
(74) |
Representative: Nielsen, Henrik Sten et al |
|
Budde, Schou & Ostenfeld A/S,
Bredgade 41,
P.O. Box 1183 1011 Copenhagen K 1011 Copenhagen K (DK) |
(56) |
References cited: :
EP-A- 0 463 181 WO-A-94/05549 CH-A- 566 909 US-A- 2 413 686
|
WO-A-93/15974 CH-A- 563 756 FR-A- 1 327 192
|
|
|
|
|
|
|
|
|
Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
|
[0001] The present invention relates to a disposable filter bag to be used in the preparation
of extraction drinks, such as tea, and in particular a disposable filter bag which
is especially suitable for the preparation of one single portion of tea directly in
a cup or a mug.
[0002] During several years, disposable tea filter bags of the kind comprising a bag made
from paper material and being prefilled with tea leaves and which tea filter bag is
connected to a holder component, made from a piece of cardboard or as part of an envelope,
through a string fixated by means of a staple, have been extensively used in the preparation
of tea, not least in the preparation of tea in small quantities such as the preparation
of one single portion directly in a cup or a mug.
[0003] However, the manufacture of such disposable filter bags is costly as in addition
to the production of the tea filter bag and the filling of tea into the bag it comprises
fixating a piece of cardboard or the like to a string, closing the tea filter bag
by folding and fixating the string, which is provided with a piece of cardboard, to
the closed tea filter bag by means of a staple. A further disadvantage of such tea
filter bags is that they are not very environmentally desirable.
[0004] Disposable filter bags made from two sheets of a fiber material as e.g. heat sealed
filter paper which is sealed along their edges for containing a portion of tea leaves
have been suggested for substituting the above mentioned tea filter bags. In the sealed
edge areas, a cut or a weakening line is made enabling partly detachment of a part
of the sealed edge areas from the filter bag for the formation of a holder component
for handling of the bag. Examples of this prior art is described in US patent No.
2,413,686 and French patent No. 1,327,192.
[0005] It has furthermore been suggested to provide tea filter bags with a special fixation
means to be placed around the spout of a teapot or the handle of a cup.
[0006] US patent No. 3,899,599 thus describes the assembly of a tea filter bag in which
the tea filter bag proper is confined between two sheets which may be used for fixating
the bag to the spout of a teapot by means of a number of cuts. Moreover, it is illustrated
how the bag may be brought to hang on the edge of a mug, which way of hanging is considered
to be very unstable. Anyway, this US patent relates to an assembly which may be considered
very expensive to produce.
[0007] WO 93/15974 shows a disposable filter bag manufactured by means of two sheets of
filter paper which are sealed together around a material to be extracted and in which
assembly an edge area is cut for the formation of a loop formed handle to be placed
around the handle of a cup. This assembly suffers from the drawback that it is applicable
for cups or mugs, only, the handle size, handle form and handle position of which
fit with the dimensions of the loop formed tea bag handle.
[0008] The present invention provides a disposable filter bag to be used for the preparation
of extraction drinks in containers of different dimensions, especially in cups and
mugs of different dimensions and without considering the design and position of a
handle, if any, of the container, the disposable filter bag in accordance with the
present invention being meant for hanging on the edge of the container during extraction
and furthermore being designed in a manner enabling it to be hung on container edges
of different dimensions, especially cups or mugs having different rim configurations.
[0009] Thus, the present invention relates to a disposable filter bag as specified in claim
1.
[0010] When in the following expressions such as "upper" and "lower", "upwards" and "downwards"
etc. are being used these expressions have to be apprehended in relation to the position
of the filter bag when it is positioned in a hanging position on the edge of a container
with the suspension areas resting against the rim of the container.
[0011] The disposable filter bag according to the present invention is inexpensive to produce
as it may be produced from two sheets of material joined together for producing of
the extraction chamber for containing the material which is to be extracted, the extraction
chamber being either totally closed around a suitable quantity of extractable material
or being upwardly open for later filling by an extractable material to be chosen by
the user. The surrounding part of the two sheets of material may be joined totally
or partly as desired.
[0012] As examples of suitable materials for manufacturing of disposable filter bags according
to the present invention various kinds of paper material may be mentioned, including
paper material mixed with other fibrous materials than cellulose, such as thermoplastics
fibers, various kinds of plastics materials, including non-woven or melt-blown plastics
or polymeric material. Also coated materials such as paper coated by latex or plastics
materials may be used. Perforated plastics foils are also applicable. A heat sealable
paper material is presently preferred. Usually, the paper material has a grammage
of 10 to 50 g/m
2, e.g. a grammage of 12.5 to 25 g/m
2 and perferably a grammage of 12.5 g/m
2 to 16.5 g/m
2, such as a preferred grammage of 12.5 g/m
2 provided the paper material is joined together in an embossing or printing process,
and a grammage of 16.5 g/m
2 provided the paper material is joined together in a heat sealing process. Such paper
materials are available on the market bearing the trade mark Tea Bag Paper and Heatsealable
Tea Bag Paper from the German company Papierfabrik Schoeller & Hoesch GmbH, D-7562
Gernsbach, Germany. Another preferred material is a polypropylene materiale, especially
a non-woven, point by point heat seable polypropylene material. Such a material is
available on the market bearing the trade mark Holmestra Non-Woven® from the company
Fiberweb Sweden AB, Box 193, S-601 Norrköping, Sweden. The material is available in
various grammages and usually a material having a grammage of from 10 to 100 g/m
2 will be used, e.g. a grammage of from 20 to 80 g/m
2 and especially from 25 to 60 g/m
2.
[0013] The material sheets used must be characterized by being able to substantially retaining
the extractable material in the extraction chamber, but being able to allow the liquid
used for the extraction to pass to such an extent that the desired extraction can
take place. It is to be understood that the extraction chamber defining material sheets
are able jointly to substantially retain the extractable material in the chamber,
but allow the liquid necessary for the extraction to pass to such an extent that the
extraction desired can take place. Thus, it would be possible to leave e.g. one of
the material sheets impermeable or substantially impermeable for the extraction liquid,
provided that the second material sheet is sufficiently porous for allowing the desired
extraction to take place and at the same time is in all essentials able to retain
the extractable material in the chamber. Thus, one of the material sheets may be produced
from a continuous foil, e.g. a foil made from thermoplastics material, such as polypropylene.
Furthermore, one of the material sheets or both of them may be designed with one part
being permeable for the extraction liquid as well as a second part being unimpermeable
for the liquid.
[0014] For joining the material sheets any suitable joining technique may be utilized, such
as welding, glueing, printing and/or embossing as the joining technique is to be chosen
in consideration of the nature of the material sheets. Cold sealing as well as heat
sealing techniques are applicable, and a rotation technique suchs as rotation heat
sealing/cutting is just as applicable as a more discontinuously effective technique,
such as flush heat welding or cutting.
[0015] The disposable filter bag according to the present invention comprises an upper part
constituting a holder component and a lower part constituting an extraction chamber
for containing the material to be extracted. The upper part and the lower part are
integrally made and are connected to each other in an area around a common central
axis of the holder component and of the extraction chamber. On each side of the central
axis, the holder component is provided with a suspension means. Each of these suspension
means comprises a suspension area intended to rest on the rim of the extraction container.
These suspensions areas are designed in a manner enabling them to receive edges of
different dimensions. This suspension by means of two suspension means, one of each
side of the central axis and each being provided with a suspension area designed in
a way enabling them to receive container rims of different dimensions, causes the
disposable filter bag according to the present invention to rest safely on the rim
of e.g. cups and mugs of different designs during the extraction.
[0016] In order to save materials the disposable filter bag according to the present invention
is typically of rectangular configuration, but principally it may be produced in other
configurations, e.g. having a circular extraction chamber. In consideration of the
balance when hanging the bag on the rim of a container, the bag may usually in all
essentials be symmetrical around the central part.
[0017] The suspension means will typically be produced by means of cuts or weakening lines
made in the bag material, the cut or weakening lines being produced simultaneously
with the bag being cut from continuously conveyed and joined material sheets.
[0018] The cutting may take place in any suitable manner, but typically it will be made
by blanking. The blanking may be made coldly or during influence of heat. By blanking
during influence of heat, a joined welding of the material sheets in the blanking
area is simultaneouly obtained if the material sheets comprise a sufficient quantity
of thermoplastics material.
[0019] It is an essential feature of the disposable filter bag according to the present
invention that the suspension areas in each of the suspension means are designed in
a manner so as to enable receipt of container rims of different dimensions. This feature
may be obtained by producing the suspension area by means of an upwardly to convex
cutting in the holder component. This upwardly convex cutting may be of many different
configurations and may be of an angular or an annular configuration. The cutting may
e.g. take the configuration of an upward triangle top, an upwardly section of a rectangle,
a trapezium, a circle, an ellipse, an oval or similar. Moreover, the cutting may constitute
a closed configuration, e.g. a circle or an oval, so that a figure of this configuration
is cut in the holder component. A similar effect is obtained when the suspension area
forms a star-like cut in the holder component. The cutting may also have the same
shape as the upper part of a shepherd's stick. The shepherd's stick-shaped cutting
as well as other kinds of cuttings may have its free end turned towards the central
axis or against it. It is of vital importance that the upwardly convex part of the
cutting comprises a good surface of contact for the container rim.
[0020] Usually, curved cuttings are preferred since they do not constitute a natural point
for an unintended breach of the holder component.
[0021] In one embodiment of the disposalble filter bag according to the present invention,
the suspension means are made in the upper part of the bag. However, the suspension
means may also extend from the upper part of the bag and further down into the lower
part of the bag on both sides of the extraction chamber. For instance, the suspension
means may extend downwardly along one third or one fourth of the sides of the extraction
chamber as a couple of downwardly projecting flaps. The flaps may be of different
configurations, but may e.g. be made by means of a cutting or weakening line extending
from the edge of the bag and discontinuing in a distance from the central axis and
causing the upper part of the extraction chamber and the lower part of the bag defining
this part of the extraction chamber to get a curved configuration as a couple of rounded
shoulders.
[0022] In the above description, the disposable filter bag according to the present invention
is described with special reference to a simple bag produced by joining two material
sheets together. The disposable filter bag according to the present invention may,
however, be produced as a so-called twofold bag.
[0023] Traditional twofold bags are produced from one hose length of e.g. filter paper which,
after having been filled up with for instance tea, is bent together in the middle
so that its free ends reach one another and are thereafter folded once and closed
by a staple and provided with a string and a holder component flap. A disposable filter
bag according to the present invention and produced as a twofold bag is produced correspondingly
by means of a hose filled up with material to be extracted, but after bending of the
hose, the two ends of the hose are joined together for the formation of an upper part
consisting of four layers and constituting a holder component as described above.
Due to its four layers, this holder component is of course characterized by being
of increased strength and rigidity.
[0024] Also in other embodiments of the disposable filter bag according to the present invention,
the holder component may be made more rigid by adding one further material sheet.
The holder component may also be made more rigid by embossing of a suitable pattern,
e.g. by embossing of slots or ribs for strengthening in the desired direction.
[0025] The holder component may also be provided with some kind of characteristic for identification
of the product and/or the manufacturer. Such a characteristic may be made by means
of embossing or blanking in connection with the manufacturing procedure, by printing
on the finished bag or by printing on the material sheet before manufacturing the
bag. Of course, it is also possible to provide the holder component with a characteristic
by sticking a label or the like which will make the holder component more rigid, as
well.
[0026] The holder component may, moreover, be provided with means for reducing the wick
effect, e.g. by means of a water repellant ribbon to be welded into the assembly and
which may further serve the purpose of reinforcing the holder component in cross direction.
The means for reducing the wick effect may also comprise transverse welding lines
or cutting lines. The wick effect may also be reduced by increasing the temperature
during welding of the holder component.
[0027] In the following the present invention will be described further with reference to
the drawing in which
Fig. 1 is a view of an embodiment of the disposable filter bag according to the present
invention in which the suspension means is provided in the upper part of the bag and
the extraction chamber is a closed chamber containing material to be extracted,
Fig. 2 is a view of another embodiment of the disposable filter bag according to the
present invention in which the suspension means extends from the upper part of the
bag and further down in the lower part of the bag on each sides of the extraction
chamber and the extraction chamber is a closed chamber containing material to be extracted,
Fig. 3 is a view of yet another embodiment of the disposable filter bag according
to the present invention in which the bag is made as a twofold bag, the suspension
means is made in the upper part of the bag and the extraction chamber is a closed
chamber containing the material to be extracted,
Fig. 4-10 are schematic views of different embodiments of the holder component, and
Fig. 11 illustrates a disposable filter bag according to Fig. 2 in a hanging position
on the rim of a mug before filling of boiling water.
[0028] Fig. 1 illustrates a presently preferred embodiment of the disposable filter bag
according to the present invention designated by the reference numeral 1. The bag
comprises an upper part 2 constituting a holder component 3 and a lower part 4 constituting
an extraction chamber 5. The filter bag is produced from two material sheets 11, 12
of a paper material mixed with thermoplastics fibers for the formation of a heat weldable
filter paper with a grammage of 16.5 g/m
2. Between the two material sheets 11, 12 a portion of tea leaves 10 is situated as
shown in the lowermost lefthand corner of the bag in which a part of the material
sheet 11 is removed for purposes of illustration. The upper part 2 of the filter bag
as well as the side edges of the lower part are joined for defining the extraction
chamber 5. It is evident that the upper part 2 of the filter bag and its lower part
4 are integrally made and connected to each other in an area 6 around the common central
axis 7 of the holder component 3 and the extraction chamber 5. On each side of the
central axis the holder component 3 is provided with a suspension means 8. The suspension
means 8 is produced by means of cuttings for weakening lines 13 made in the bag material.
Over an upward section, the cuttings or the weakening lines 13 have an upwardly convex
course each of the cuttings or weakening lines 13 ending upwardly in an annular cut
17 in the holder component. These annular cuts 17 constitute suspension areas 9 intended
to rest during the extraction on the edge of the container in which the extraction
is to take place, e.g. on the rim of a cup or a mug, and will typically be of a diameter
in the range of 3-8 mm, e.g. approx. 5 mm. When being hung on the rim of e.g. a mug,
the disposal filter bag 1 is positioned with the lower part including the extraction
chamber 5 which contains the tea leaves hanging down into the mug with the suspension
areas 9 resting on the rim of the mug and the downwardly projecting flaps of the suspension
means 8 positioned against the exterior of the mug. The special design of the suspension
areas 9 causes the disposable filter bag 1 to hang safely on edges of dimensions of
ordinary occurance. In the upper part of the bag, perpendicular slots or ribs are
made by embossing which causes the upper part of the bag to be more rigid in the cross
direction. However, in an area 24 the slots or ribs are omitted e.g. for esthetic
reasons, in order to provide a special holder component area or in order to provide
an area intended to be printed with a logo or the like.
[0029] If instead an increase of the rigidity in the cross direction is desired it is of
course also possible to produce the upper part of the bag with horizontal slots or
ribs. By embossing of horizontal slots or ribs in the joining area along the horizontal
upper edge of the extraction chamber, a further increase of the advantageous supporting
effect already provided by the joining along this horizontal upper edge in the cross
direction may be obtained. Also a combination of horizontal and vertical slots or
ribs or other embossing patterns are applicable. Even the joining proper of the two
material sheets provides an increased rigidity.
[0030] Fig. 2 illustrates another embodiment of the disposable filter bag 1. This embodiment
is different from the one shown i Fig. 1 in that the suspension means 8 extends from
the upper part of the bag 2 and further down into the lower part 4 of the bag on each
side of the extraction chamber. The upper part of the extraction chamber is also rounded
upwardly so that the configurations of the suspension means 8 and the extraction chamber
5 are adjusted to each other. Further, it is evident how the lower edge of the bag
is not in this case formed by a fold, but by a joining. Like in the embodiment shown
in Fig. 1, the suspension areas 9 are formed by annular cuttings in the holder component
3, but the cuts or weakening lines 13 end up somewhere else in the annular curve so
that the suspension means 8 forms an upward projection 19 immediately below the suspension
area 9. These upward projections 19 serve the purpose of being able to engage with
an outward edge, e.g. of a mug and thereby contribute to further fixation of the filter
bag during the extraction. Like in the embodiment shown in Fig. 1, the holder component
3 is provided with embossed slots or ribs in cross direction, but in the present embodiment
the slots or ribs continue in the side seams of the lower part of the bag.
[0031] Fig. 3 illustrates a disposable filter bag 1 produced as a so-called twofold bag.
In this bag, the extraction chamber 5 is made by a hose of filter paper which is filled
with tea leaves (not shown) and folded in the centre, so that the two free ends of
the hose abut on one another. Thereafter, these two free ends are welded or embossed
together for the formation of the upper part 2 of the bag with the holder component
3 which thus comprises four layers of joined filter paper. The suspension means 8
is made by means of cuts for weakening lines 13 which over an upward section are upwardly
convex so that an upwardly convex cut 16 is provided in the holder component which
cut is of almost the same configuration as the upper part of a shepherd's stick. The
holder component 3 of the bag is provided with characteristics 20 which may be made
by embossing, blanking or printing. In the embodiment illustrated, the suspension
means converge downwardly towards the central axis of the bag, and in this area a
water repellant ribbon 21 is welded into the assembly which water repellant ribbon
partly serves the purpose of breaking the wick effect of the paper material and partly
serves the purpose of strengthening and supporting the area in which the suspension
means converge towards the central axis. The mutual distance between the converging
projections of the suspension means 8 is relatively short, of the range of 5 to 10
mm, and therefore it contributes to further ensure fixation of the filter bag to a
cup or to a mug by engaging with the handle of the cup or the mug.
[0032] Further embodiments of the holder component are illustrated schematically in Fig.
4-10. In the embodiment of the filter bag shown in Fig. 4, the cuts or weakening lines
13 have a curved course 14 during a section so that a kind of barbs are provided contributing
to prevent the bag from sliding down from the rim of the container. A corresponding
effect is obtained by the embodiment shown in Fig. 5 in which the cuts or weakening
lines 13 are transversely provided with small cuts 15.
[0033] Fig. 6 illustrates an embodiment of a filter bag in which the suspension areas are
formed by star-shaped cuts 17 in the holder component. These star-formed cuts 18 have
the double function of being able to receive container edges of different dimensions
and at the same time being able to engage with any container edge.
[0034] In the embodiment shown in Fig. 7, a scale 22 is provided on the upper part of the
bag for indication of infusion time, as the distance reached by the liquied in the
upper part of the bag indicates the infusion time.
[0035] Fig. 8 illustrates that the upward cutting or weakening lines may just as well have
an inward as an outward bending as shown in some of the other figures.
[0036] In fig. 9, a cut 23 is made in the holder component which cut may be utilized for
grasping the bag either during the preparation of an extraction drink or during the
manufacture of the bag proper. The cut may be of various configurations, a circular
cut being suitable for suspension of the bag on a punch during the process of production.
An oval cut like the one shown in the figure is suitable for grasping the bag in connection
with use of the bag and would furthermore be able to provide a certain breach of the
wick effect. In this embodiment, the cuts or the weakening lines 13 are of a softly
outward configuration.
[0037] Fig. 10 illustrates a cutting line 21 provided for breach of the wick effect.
[0038] Fig. 11 illustrates a mug 50 with a filter bag 1 of the embodiment shown i Fig. 2
hanging on the edge 51 of a mug with the extraction chamber 5 hanging down into the
mug and with the suspension means 8 (not shown) protruding beyond the rim of the mug
on its reverse side (not shown) with the suspension areas 9 resting against the edge
51 of the mug 50. In the condition shown water has not yet been poured into the mug.
When hot water is poured into the mug, the extraction chamber 5 will swing out from
the inside of the mug and float in the water or turn tilted between the opposite sides
of the mug so that the extraction may take place freely.
[0039] At the same time, the suspension means 8 is pressed against the exterior of the mug
and contributes to fixate the filter bag against the edge of the mug. Gradually, as
the water is absorbed by the part of the holder component situated between the suspension
areas and the extraction chamber, this part of the filter bag adheres to the inside
of the mug above the surface of the liquid and serves the purpose of further fixating
the bag. When the desired extraction has taken place the filter bag is removed from
the extract by grasping around the holder component.
[0040] In the above description, the invention is described by means of preferred embodiments
of the invention, but it will be understood that different modifications and amendments
can be made within the scope of the attached patent claims.
1. A disposable filter bag (1) for preparation of extraction drinks, such as tea, in
a container (50) having a rim (51), said disposable filter bag (1) comprising an upper
part (2) forming a bolder component (3) and a lower part (4) forming an extraction
chamber (5) for containing material (10) to be extracted, the upper part (2) and the
lower part (4) being integrally made from a common web of material (11, 12) and connected
to one another in an area (6) around a common central axis (7) of the holder component
(3) and of the extraction chamber (5),
characterised in that
the holder component (3) on each side of the central axis (7) is provided with cuts
or weakening lines (13) each extending from an edge of the bag and ending at a distance
form the central axis (7), such that a couple of downwardly projecting suspension
means (8) in the form of a flap on each side of the axis (7) are formed in the upper
part (2) of the bag,
and in that each suspension means (8) comprises a container rim receiving area (9)
intended during the extraction to rest on and receive the rim (51) of the container
(50), said rim receiving area (9) being adapted to receive container rims (51) of
different dimensions.
2. A disposable filter bag according to Claim 1, in which the container rim receiving
area (9) is made by an upwardly convex cut (16) in the holder component, the cut (16)
being connected to a corresponding cut or weakening line (13) for the suspension means
(8).
3. A disposable filter bag according to Claim 1, in which the container rim receiving
area (9) is made by an annular or oval cut (17) in the holder component, the cut (17)
being connected to a corresponding cut or weakening line (13) for the suspension means
(8).
4. A disposable filter bag according to Claim 1, in which the container rim receiving
area (9) is made by a star-shaped cut (18) in the holder component, the cut (18) being
connected to a corresponding cut or weakening line (13) for the suspension means (8).
5. A disposable filter bag according to one or more of the preceding Claims, in which
the cuts or weakening lines (13) extend upwardly convex over an upward section.
6. A disposable filter bag according to one or more of the preceding Claims, wherein
the common web of material of the disposable filter bag is produced by means of joining
at least two material webs (11, 12) together.
7. A disposable filter bag according to Claim 6, in which at least one of the material
webs (11, 12) is made from a paper material such as a paper material mixed with thermoplastic
fiber or porous plastics material or polymeric material, such as a perforated plastics
foil or a non-woven polymeric material such as a scattered heat sealed, non-woven
polypropylene material.
8. A disposable filter bag according to Claim 6 or 7, in which the joining is made by
welding, gluing and/or embossing.
9. A disposable filter bag according to one or more of the preceding Claims, which disposable
filter bag has the form of a twofold bag.
10. A disposable filter bag according to one or more of the preceding Claims, in which
the suspension means converge downwardly towards the central axis (7).
11. A disposable filter bag according to one or more of the preceding Claims, in which
the suspension means form an upward projection (19) immediately below the container
rim receiving area.
12. A disposable filter bag according to one or more of the preceding Claims, which disposable
filter bag is of a substantially rectangular configuration.
13. A disposable filter bag according to one or more of the preceding Claims, in which
the extraction chamber (5) is upwardly open.
14. A disposable filter bag according to one or more of Claims 1-12, in which the extraction
chamber (5) is a closed chamber containing material (10) to be extracted.
15. A disposable filter bag according to one or more of the preceding Claims, in which
the holder component (3) is reinforced by embossing.
16. A disposable filter bag according to one or more of the preceding Claims, in which
the holder component (3) is reinforced by adding a further material web.
17. A disposable filter bag according to one or more of the preceding Claims, in which
the holder component (3) is provided with a characteristic (20), preferably by embossing,
blanking or printing.
18. A disposable filter bag according to one or more of the preceding Claims, in which
the holder component (3) is provided with means (21) for reduction of the wick effect.
19. A disposable filter bag according to Claim 18, in which the means (21) for reduction
of the wick effect are transverse welding lines, cutting lines, cuttings or inserted
welded ribbons.
20. A disposable filter bag according to one or more of the preceding Claims, in which
the cuts or the weakening lines (13) have a section with a curved course (14) or are
provided with small transverse cuts (15).
21. A disposable filter bag according to one or more of the preceding claims, which disposable
filter bag is substantially symmetrical around the central axis (7).
1. Einwegfilterbeutel (1) zur Herstellung von Aufgußgetränken, wie Tee, in einem Behälter
(50) mit einem nach außen umgebogenen Rand (51), wobei dieser Einwegfilterbeutel (1)
einen oberen Bereich (2), welcher ein Halteelement (3) bildet, und einen unteren Bereich
(4) aufweist, welcher eine Aufgußkammer (5) zum Beinhalten des aufzugießenden Materials
(10) bildet, wobei der obere Bereich (2) und der untere Bereich (4) integral aus einem
gemeinsamen Materialgewebe (11, 12) hergestellt und in einem Bereich (6) um eine gemeinsame
Mittelachse (7) des Halteelementes (3) und der Aufgußkammer (5) herum miteinander
verbunden sind,
dadurch gekennzeichnet, daß
das Halteelement (3) auf jeder Seite von der Mittelachse mit Einschnitten oder perforierten
Linien (13) versehen ist, welche jeweils von einer Kante des Beutels ausgehen und
in einem Abstand von der Mittelachse (7) enden, so daß ein Paar nach unten vorspringender
Aufhängevorrichtungen (8) in der Form einer Klappe auf jeder Seite der Achse (7) in
dem oberen Bereich (2) des Beutels gebildet wird,
und daß jede Aufhängevorrichtung (8) einen Bereich (9) zur Aufnahme eines Behälterrandes
aufweist, welcher während des Aufgusses dafür bestimmt ist, auf dem nach außen umgebogenen
Rand (51) des Behälters (50) zu ruhen und diesen aufzunehmen, wobei der den nach außen
umgebogenen Rand aufnehmende Bereich (9) dafür eingerichtet ist, Behälterränder (51)
mit verschiedenen Abmessungen aufzunehmen.
2. Einwegfilterbeutel gemäß Anspruch 1, bei welchem der den Behälterrand aufnehmende
Bereich (9) von einem nach oben hin konvexen Einschnitt (16) in dem Halteelement gebildet
ist, wobei der Einschnitt (16) mit einem entsprechenden Einschnitt oder einer perforierten
Linie (13) für die Aufhängevorrichtung (8) verbunden ist.
3. Einwegfilterbeutel gemäß Anspruch 1, bei welchem der den Behälterrand aufnehmende
Bereich (9) von einem ringförmigen oder ovalen Einschnitt (17) in dem Halteelement
gebildet ist, wobei der Einschnitt (17) mit einem entsprechenden Einschnitt oder einer
perforierten Linie (13) für die Aufhängevorrichtung (8) verbunden ist.
4. Einwegfilterbeutel gemäß Anspruch 1, bei welchem der den Behälterrand aufnehmende
Bereich (9) von einem sternförmigen Einschnitt (18) in dem Halteelement gebildet ist,
wobei der Einschnitt (18) mit einem entsprechenden Einschnitt oder einer perforierten
Linie (13) für die Aufhängevorrichtung (8) verbunden ist.
5. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, bei welchem
sich die Einschnitte oder perforierten Linien (13) nach oben konvex über einen nach
oben gerichteten Abschnitt erstrecken.
6. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, bei welchem
das gemeinsame Materialgewebe des Einwegfilterbeutels mittels Verbindung von wenigstens
zwei Materialgeweben (11, 12) miteinander hergestellt wird.
7. Einwegfilterbeutel gemäß Anspruch 6, bei welchem wenigstens eines der Materialgewebe
(11, 12) aus einem Papiermaterial hergestellt ist, wie einem Papiermaterial, welches
mit thermoplastischer Faser oder porösem Kunststoffmaterial oder Polymermaterial vermischt
ist, wie perforierter Kunststoffolie oder einem Vliespolymermaterial, wie einem gestreuten,
heißgesiegelten Vliespolypropylenmaterial.
8. Einwegfilterbeutel gemäß Anspruch 6 oder 7, bei welchem die Verbindung durch Verschweißen,
Verleinien und/oder Vollprägen hergestellt wird.
9. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, wobei der Einwegfilterbeutel
die Form eines Doppelbeutels aufweist.
10. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, bei welchem
die Aufhängevorrichtungen nach unten zu der Mittelachse (7) hin konvergieren.
11. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, bei welchem
die Aufhängevorrichtungen einen nach oben gerichteten Überhang (19) unmittelbar unterhalb
des den Behälterrand aufnehmenden Bereiches bilden.
12. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, wobei der Einwegfilterbeutel
eine im wesentlichen rechteckige Konfiguration aufweist.
13. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, bei welchem
die Aufgußkammer (5) nach oben hin offen ist.
14. Einwegfilterbeutel gemäß einem oder mehreren der Ansprüche 1-12, bei welchem die Aufgußkammer
(5) eine geschlossene Kammer ist, welche aufzugießendes Material (10) enthält.
15. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, bei welchem
das Halteelement (3) durch Vollprägen verstärkt wird.
16. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, bei welchem
das Halteelement (3) durch Hinzufügen eines weiteren Materialgewebes verstärkt wird.
17. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, bei welchem
das Halteelement (3) mit einer Kennzeichnung (20) versehen ist, vorzugsweise durch
Vollprägen, Blankdruck oder Aufdruck.
18. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, bei welchem
das Halteelement (3) mit einer Vorrichtung (21) zur Verringerung des Dochteffektes
versehen ist.
19. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, bei welchem
die Vorrichtung (21) zur Verringerung des Dochteffektes aus querliegenden Schweißlinien,
Schnittlinien, Einschnitten oder eingesetzten Schweißbändern besteht.
20. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, bei welchem
die Einschnitte oder die perforierten Linien (13) einen Querschnitt mit einem gebogenen
Verlauf (14) aufweisen oder mit schmalen, querliegenden Einschnitten (15) versehen
sind.
21. Einwegfilterbeutel gemäß einem oder mehreren der vorherigen Ansprüche, wobei der Einwegfilterbeutel
im wesentlichen symmetrisch um die Mittelachse (7) ausgebildet ist.
1. Sachet (1) filtrant jetable de préparation d'infusions, telles que du thé, dans un
récipient (50) ayant un bord (51), le sachet (1) filtrant jetable comprenant une partie
(2) supérieure formant un élément (3) de maintien, et une partie (4) inférieure formant
une chambre (5) d'infusion, destinée à contenir de la matière (10) à infuser, la partie
(2) supérieure et la partie (4) inférieure étant constituées d'un seul tenant en une
nappe commune de matière (11, 12), et reliées l'une à l'autre dans une zone (6) autour
d'un axe (7) central commun de l'élément (3) de maintien et de la chambre (5) d'infusion,
caractérisé en ce que
l'élément (3) de maintien est muni de chaque côté de l'axe (7) central d'entailles
ou de lignes (13) d'affaiblissement, partant chacune d'un bord du sachet et se terminant
à distance de l'axe (7) central de manière à former, dans la partie (2) supérieure
du sachet, une paire de moyens (8) de suspension faisant saillie vers le bas, sous
la forme d'un pan de chaque côté de l'axe (7),
et en ce que chaque moyen (8) de suspension comprend une zone (9) de réception du
bord du récipient destinée à venir, pendant l'infusion, sur le bord (51) du récipient
(50) et à le recevoir, la zone (9) de réception du bord étant apte à recevoir des
bords (51) de récipient de dimensions différentes.
2. Sachet filtrant jetable suivant la revendication 1, dans lequel la zone (9) de réception
du bord du récipient est constituée d'une entaille (16) convexe vers le haut, ménagée
dans l'élément de maintien, l'entaille (16) étant reliée à une entaille correspondante
ou à une ligne (13) d'affaiblissement correspondante pour les moyens (8) de suspension.
3. Sachet filtrant jetable suivant la revendication 1, dans lequel la zone (9) de réception
du bord du récipient est constituée d'une entaille (17) annulaire ou ovale ménagée
dans l'élément de maintien, l'entaille (17) étant reliée à une entaille correspondante
ou à une ligne (13) d'affaiblissement correspondante pour les moyens (8) de suspension.
4. Sachet filtrant jetable suivant la revendication 1, dans lequel la zone (9) de réception
du bord d'un récipient est constituée d'une entaille (18) en forme d'étoile ménagée
dans l'élément de maintien, l'entaille (18) étant reliée à une entaille correspondante
ou à une ligne (13) d'affaiblissement correspondante pour les moyens (8) de suspension.
5. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
dans lequel les entailles ou les lignes (13) d'affaiblissement s'étendent en étant
convexes vers le haut, sur une partie vers le haut.
6. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
dans lequel la nappe commune de matière du sachet filtrant jetable est produite en
réunissant au moins deux nappes (11, 12) de matière.
7. Sachet filtrant jetable suivant la revendication 6, dans lequel au moins l'une des
nappes (11, 12) de matière est en une matière à base de papier, tel que du papier
mélangé à des matières thermoplastiques fibreuses ou poreuses, ou une matière polymère,
telle qu'une feuille de matière plastique perforée ou une matière polymère non tissée,
telle que du polypropylène non tissé et thermosoudé point par point.
8. Sachet filtrant jetable suivant la revendication 6 ou 7, dans lequel la jonction est
faite par soudage, par collage et/ou par gaufrage.
9. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
le sachet filtrant jetable ayant la forme d'un sachet à deux plis.
10. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
dans lequel les moyens de suspension convergent vers le bas en direction de l'axe
(7) central.
11. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
dans lequel les moyens de suspension forment une partie saillante (19) vers le haut
immédiatement en dessous de la zone de réception d'un bord de récipient.
12. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
le sachet filtrant jetable ayant une configuration sensiblement rectangulaire.
13. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
dans lequel la chambre (5) d'infusion est ouverte vers le haut.
14. Sachet filtrant jetable suivant l'une ou plusieurs des revendications 1 à 12, dans
lequel la chambre (5) d'infusion est une chambre fermée contenant de la matière (10)
à infuser.
15. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
dans lequel l'élément (3) de maintien est renforcé par gaufrage.
16. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
dans lequel l'élément (3) de maintien est renforcé par addition d'une autre nappe
de matière.
17. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
dans lequel l'élément (3) de maintien est muni d'une caractéristique (20) de préférence
par gaufrage, découpage ou impression.
18. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
dans lequel l'élément (3) de maintien est muni du moyen (21) de réduction de l'effet
de mèche.
19. Sachet filtrant jetable suivant la revendication 18, dans lequel les moyens (21) de
réduction de l'effet de mèche sont des lignes de soudure transversales, des lignes
de coupes transversales, des entailles transversales ou des rubans soudés et insérés
de manière transversale.
20. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
dans lequel les entailles ou les lignes (13) d'affaiblissement ont une partie (14)
s'étendant de manière incurvée ou sont munies de petites entailles (15) transversales.
21. Sachet filtrant jetable suivant l'une ou plusieurs des revendications précédentes,
dans lequel le sachet filtrant jetable est sensiblement symétrique par rapport à l'axe
(7) central.