U.S. patent application number 14/443165 was filed with the patent office on 2015-10-08 for moisture control label.
The applicant listed for this patent is ESSENTRA PACKAGING & SECURITY LIMITED, ESSENTRA POROUS TECHNOLOGIES CORP.. Invention is credited to Philip John Allen, Jenny Gater, Bennett Clayton Ward, Jian Xiang.
Application Number | 20150287346 14/443165 |
Document ID | / |
Family ID | 50726718 |
Filed Date | 2015-10-08 |
United States Patent
Application |
20150287346 |
Kind Code |
A1 |
Ward; Bennett Clayton ; et
al. |
October 8, 2015 |
MOISTURE CONTROL LABEL
Abstract
Self-adhesive moisture control label for product packaging
including a water absorbent layer capable of absorbing water and an
adhesive layer provided such that the label can be adhered to the
packaging. The moisture control label is capable of controlling the
humidity of the atmosphere within the packaging.
Inventors: |
Ward; Bennett Clayton;
(Midlothian, VA) ; Xiang; Jian; (Midlothian,
VA) ; Gater; Jenny; (Derbyshire, GB) ; Allen;
Philip John; (Nottinghamshire, GB) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ESSENTRA PACKAGING & SECURITY LIMITED
ESSENTRA POROUS TECHNOLOGIES CORP. |
Nottinghamshire
Colonial Heights |
VA |
GB
US |
|
|
Family ID: |
50726718 |
Appl. No.: |
14/443165 |
Filed: |
November 15, 2013 |
PCT Filed: |
November 15, 2013 |
PCT NO: |
PCT/GB2013/053015 |
371 Date: |
May 15, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61727482 |
Nov 16, 2012 |
|
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|
Current U.S.
Class: |
40/638 |
Current CPC
Class: |
A61B 10/0045 20130101;
B01L 3/5023 20130101; B65D 81/24 20130101; B01L 2200/143 20130101;
G09F 3/0291 20130101; G09F 3/0294 20130101; A24F 25/02 20130101;
G01N 33/52 20130101; G09F 3/02 20130101; G09F 3/10 20130101; A61B
2010/0006 20130101; A61B 2010/0009 20130101; B65D 85/1081 20130101;
B65D 81/22 20130101; G09F 2003/0272 20130101 |
International
Class: |
G09F 3/02 20060101
G09F003/02; G09F 3/10 20060101 G09F003/10 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 7, 2013 |
GB |
1300225.8 |
Claims
1. A self-adhesive moisture control label for product packaging,
comprising: a water absorbent layer capable of absorbing water; and
an adhesive layer provided such that the label can be adhered to
the packaging; wherein the moisture control label is capable of
controlling the humidity of the atmosphere within the packaging;
wherein in use, a graphical indicium disposed below the water
absorbent layer becomes less visible as the water absorbent layer
becomes drier, and becomes more visible as the water absorbent
layer becomes wetter.
2. A label according to claim 1, wherein water absorbed by the
water absorbent layer can evaporate from the water absorbent layer
so as to control the humidity of the atmosphere within the
packaging.
3. A label according to claim 1, wherein the water absorbent layer
comprises a fibrous pad.
4-6. (canceled)
7. A label according to claim 1, wherein the water absorbent layer
comprises a sponge material.
8. A label according to claim 1, further comprising a base layer to
which the water absorbent layer is adhered to on a front side,
wherein the adhesive layer is provided on the rear side of the base
layer.
9. A label according to claim 8, wherein the base layer is larger
than the water absorbent layer such that a display region extends
beyond the periphery of the water absorbent layer.
10. A label according to claim 9, wherein use instructions and/or
commercial graphics are provided on the display region of the base
layer.
11. A label according to claim 8, wherein the water absorbent layer
is located centrally with respect to the base layer.
12. A label according to claim 8, wherein the base layer comprises
polypropylene.
13. (canceled)
14. A label according to claim 8, wherein the water absorbent layer
is adhered to the base layer with a pressure sensitive
adhesive.
15. A label according to claim 1, wherein the adhesive layer
comprises a pressure sensitive adhesive.
16. A label according to claim 1, wherein the opacity of the water
absorbent layer varies as a function of the amount of water
retained by the water absorbent layer.
17. A label according to claim 1, wherein in a dry state the water
absorbent layer has a first opacity and wherein in a saturated
state the water absorbent layer has a second opacity which is lower
than the first opacity.
18-28. (canceled)
29. A plurality of labels, each in accordance with claim 1,
releasably adhered to a backing sheet.
30. A wound reel of labels comprising a wound backing sheet with a
plurality of labels, each in accordance with claim 1, releasably
adhered to the backing sheet.
31. Product packaging defining a volume for containing a product,
wherein a self-adhesive moisture control label in accordance with
claim 1 is adhered to the packaging such that the label is disposed
within the volume so that it can control the humidity of the
volume.
32. Product packaging according to claim 31, wherein the product
packaging is packaging for a tobacco product.
33. A method of manufacturing a wound reel of self-adhesive
moisture control labels for product packaging, comprising: applying
an adhesive to the rear side of a continuous web of water absorbent
material; releasably adhering the web of water absorbent material
to a backing sheet; cutting a series of discrete water absorbent
layers from the web of water absorbent material; removing the
skeleton of the water absorbent material; and winding a backing
sheet into a reel.
34. A method according to claim 33, further comprising: applying an
adhesive to the rear side of a continuous web of base material;
releasably adhering the web of base material to a backing sheet;
cutting a series of discrete base layers from the web of base
material; removing the skeleton of the base material; and
repeatedly removing a discrete water absorbent layer from its
backing sheet and adhering to a discrete base layer to form a
series of laminate self-adhesive moisture control labels.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is the National Stage of International
Application No. PCT/GB2013/053015, filed Nov. 15, 2013, which
claims the priority of Great Britain Application No. 1300225.8,
filed Jan. 7, 2013 and U.S. Provisional Application No. 61/727,482,
filed Nov. 16, 2012.
FIELD OF THE INVENTION
[0002] The invention relates to a self-adhesive moisture control
label for product packaging which is capable of controlling the
humidity of the atmosphere within the packaging. In particular,
although not exclusively, the invention relates to a self-adhesive
moisture control label which can be used to humidify the atmosphere
within product packaging, such as tobacco packaging, so as to
prevent the product, such as tobacco, from drying out.
BACKGROUND OF THE INVENTION
[0003] It may be desirable to control the moisture content (or
humidity) of the atmosphere in which perishable products are stored
in order to prevent them from deteriorating. Perishable products,
such as tobacco and food, are often stored in a sealed container in
an attempt to keep them fresh. However, the seal on such containers
is never perfect, particularly if the containers are disposable.
Therefore, over time, the perishable product may either dry out, or
absorb water and become damp.
[0004] For example, in order to prevent tobacco from drying out it
is desirable to store it in an atmosphere that is not too dry. In
another example, in order to prevent biscuits from going stale, it
is necessary to store them in an atmosphere that is not too
moist.
[0005] It is known to place a wet sponge in a cigar case in order
to prevent the cigars from drying out. However, this is not
appropriate for most other forms of tobacco, such as loose tobacco,
as if the wet sponge comes into contact with the tobacco it may rot
the tobacco. It is also known to use sachets of a desiccant
material in product packaging in order to maintain dryness.
However, the contents of such sachets can be poisonous if ingested
and therefore may not be suitable for food products or the
like.
[0006] It is therefore desirable to provide a means for controlling
the moisture content of the atmosphere within product
packaging.
SUMMARY OF THE INVENTION
[0007] According to an aspect of the invention there is provided
self-adhesive moisture control label for product packaging,
comprising: a water absorbent layer capable of absorbing water; and
an adhesive layer provided such that the label can be adhered to
the packaging; wherein the moisture control label is capable of
controlling the humidity of the atmosphere within the packaging.
The water absorbent layer may be wetted by a user such that in use
water evaporates from the surface so as to provide moisture (i.e.
humidify) the atmosphere within the packaging. The label may
therefore be used to prevent a product from drying out. In another
arrangement, the water absorbent layer may absorb water from the
atmosphere to dry (i.e. dehumidify) the atmosphere within the
packaging. The label may therefore be used to prevent a product
from absorbing water.
[0008] The water absorbed by the water absorbent layer may be able
to evaporate from the water absorbent layer so as to control the
humidity of the atmosphere within the packaging.
[0009] The water absorbent layer may comprise a fibrous pad or
layer. The fibrous pad or layer may be woven or non-woven (such as
a mat). The fibrous pad may comprise polymer fibres. The fibrous
pad may comprise polyolefin fibres and/or polyethylene
terephthalate (PET) fibres and/or polyethylene (PE) fibres and/or
nylon fibres and/or polyvinyl chloride (PVC) fibres and/or
polylactic acid (PLA) fibres. In other embodiments the water
absorbent layer may comprise cellulose and/or paper and/or cotton.
The water absorbent layer may be porous. The water absorbent layer
may comprise a hydrophilic material. The hydrophilic material may
comprise a hydrogel. The water absorbent layer may comprise a
sponge material. The water absorbent layer may be continuous.
[0010] The water absorbent layer may only be capable of absorbing
less than 10 ml, less than 8 ml, less than 6 ml, less than 4 ml,
less than 3 ml, less than 2 ml or less than 1 ml of water. Further,
the water absorbent layer may be capable of absorbing greater than
0 ml, greater than 0.1 ml, greater than 0.2 ml, greater than 0.3
ml, greater than 0.4 ml, or greater than 0.5 ml of water. The water
absorbent layer may be capable of absorbing at least 0.6 ml of
water. The water absorbent layer may be capable of absorbing
between 0.2-2 ml, 0.3-1.5 ml, 0.4-1 ml or 0.5-0.8 ml of water.
[0011] The water absorbent layer may have a thickness of less than
5 mm, less than 4 mm, less than 3 mm or less than 2 mm. The water
absorbent layer may have a thickness of at least 0.1 mm, at least
0.2 mm, at least 0.4 mm, at least 0.6 mm, at least 0.8 mm or at
least 1 mm. The water absorbent layer may have a thickness of
between 0.1 mm-5 mm, 0.2 mm-4 mm, 0.3 mm-3 mm, 0.5 mm-2 mm, or 0.7
mm-1.8 mm.
[0012] The water absorbent layer may have an area (in plan view) of
less than 100 cm.sup.2, less than 80 cm.sup.2, less than 60
cm.sup.2, less than 40 cm.sup.2, less than 20 cm.sup.2, less than
10 cm.sup.2, or less than 8 cm.sup.2. The water absorbent layer may
have an area (in plan view) of greater than 0.1 cm.sup.2, greater
than 0.2 cm.sup.2, greater than 0.5 cm.sup.2, greater than 1
cm.sup.2, greater than 1.5 cm.sup.2, greater than 2 cm.sup.2,
greater than 3 cm.sup.2, greater than 4 cm.sup.2, greater than 5
cm.sup.2, greater than 6 cm.sup.2, or greater than 7 cm.sup.2. The
water absorbent layer may have an area (in plan view) of between
0.2-20 cm.sup.2, 0.5-15 cm.sup.2, 1.5-10 cm.sup.2, or 3-8
cm.sup.2.
[0013] The water absorbent layer may have a density of less than 1
g/cm.sup.3, less than 0.9 g/cm.sup.3, less than 0.8 g/cm.sup.3,
less than 0.7 g/cm.sup.3, less than 0.6 g/cm.sup.3, less than 0.5
g/cm.sup.3, less than 0.4 g/cm.sup.3, less than 0.3 g/cm.sup.3, or
less than 0.2 g/cm.sup.3. The water absorbent layer may have a
density of greater than 0.01 g/cm.sup.3, greater than 0.02
g/cm.sup.3, greater than 0.03 g/cm.sup.3, greater than 0.04
g/cm.sup.3, greater than 0.05 g/cm.sup.3, greater than 0.06
g/cm.sup.3, greater than 0.07 g/cm.sup.3, greater than 0.08
g/cm.sup.3, greater than 0.09 g/cm.sup.3, or greater than 0.1
g/cm.sup.3. The water absorbent layer may have a density of between
0.01-1 g/cm.sup.3, 0.02-0.9 g/cm.sup.3, 0.03-0.8 g/cm.sup.3,
0.05-0.7 g/cm.sup.3, 0.08-0.5 g/cm.sup.3, 0.09-0.3 g/cm.sup.3, or
0.1-0.2 g/cm.sup.3.
[0014] The label may further comprise a base layer to which the
water absorbent layer is adhered to (either directly or indirectly)
on a front side. The base layer may be a uniform layer of material
or may be a laminate structure. The adhesive layer, which may be
continuous or discontinuous, may be provided on the rear side of
the base layer. The base layer may be larger than the water
absorbent layer such that a display region extends beyond the
periphery of the water absorbent layer. Use instructions and/or
commercial graphics may be provided on the display region of the
base layer. The water absorbent layer may be located centrally with
respect to the base layer. The base layer and/or the water
absorbent layer may be circular, square, triangular or any suitable
shape. If circular, the base layer and water absorbent layer may be
concentric with one another.
[0015] The base layer may have a thickness of at least 10 .mu.m, at
least 25 .mu.m, at least 50 .mu.m, at least 75 .mu.m or at least
100 .mu.m. The base layer may have a thickness of less than 1 mm,
less than 0.5 mm, less than 0.25 mm, or less than 0.15 mm. The base
layer may have a thickness of between 10 .mu.m-1000 .mu.m, 20
.mu.m-700 .mu.m, 50 .mu.m-500 .mu.m, 60-250 .mu.m, or 80 .mu.m-150
.mu.m.
[0016] The base layer may comprise polypropylene. The base layer
may comprise mono-oriented polypropylene. The base layer may
comprise polyethylene terephthalate (PET), polyethylene (PE) or
polyvinyl chloride (PVC).
[0017] The water absorbent layer may be adhered to the base layer
with a pressure sensitive adhesive, for example. The adhesive layer
may comprise a pressure sensitive adhesive.
[0018] The opacity of the water absorbent layer may vary as a
function of the amount of water retained by the water absorbent
layer. In a dry state the water absorbent layer may have a first
(high) opacity and in a saturated state the water absorbent layer
may have a second (low) opacity which is lower than the first
opacity. In use, a graphical indicium disposed below the water
absorbent layer may become less visible as the water absorbent
layer becomes drier, and may become more visible as the water
absorbent layer becomes wetter. This may provide a useful
indication to the user as to the moisture content of the water
absorbent layer. A graphical indicium may be provided below the
water absorbent layer. The graphical indicium may be provided on
the base layer. Alternatively, the graphical indicium may be
provided on the product packaging or on a separate component. The
graphical indicium may be any suitable graphic such as a logo,
text, colour, marking, promotional information, symbol, or
sign.
[0019] The invention also relates to a plurality of labels, each in
accordance with any statement herein, releasably adhered to a
backing sheet.
[0020] According to another aspect there is provided a wound reel
of labels comprising a wound backing sheet with a plurality of
labels, each in accordance with any statement herein, releasably
adhered to the backing sheet.
[0021] According to yet another aspect of the invention there is
provided product packaging defining a volume for containing a
product, wherein a self-adhesive moisture control label in
accordance with any statement herein is adhered to the packaging
such that the label is disposed within the volume so that it can
control the humidity of the volume.
[0022] The product packaging may be packaging for a tobacco
product. The tobacco product may be loose tobacco or cigars or
cigarettes or snuff or snus. The product packaging may comprise a
tub having a container base defining a volume and a detachably
attachable lid, wherein the label is adhered to the inside of the
lid.
[0023] According to a further aspect of the invention there is
provided a method of manufacturing a wound reel of self-adhesive
moisture control labels for product packaging, comprising: applying
an adhesive to the rear side of a continuous web of water absorbent
material; releasably adhering the web of water absorbent material
to a backing sheet; cutting a series of discrete water absorbent
layers from the web of water absorbent material; removing the
skeleton (or mask) of the water absorbent material; and winding the
backing sheet into a reel.
[0024] The method may further comprise: applying an adhesive to the
rear side of a continuous web of base material; releasably adhering
the web of base material to a backing sheet; cutting a series of
discrete base layers from the web of base material; removing the
skeleton of the base material; and repeatedly removing a discrete
water absorbent layer from its backing sheet and adhering to a
discrete base layer to form a series of laminate self-adhesive
moisture control labels.
[0025] It should be appreciated that the method steps may be
performed in any suitable order and are not limited to the order
presented herein.
[0026] The invention may comprise any combination of the features
and/or limitations referred to herein, except combinations of such
features as are mutually exclusive.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Embodiments of the invention will now be described, by way
of example, with reference to the accompanying drawings, in
which:
[0028] FIG. 1 schematically shows a plan view of a self-adhesive
moisture control label;
[0029] FIG. 2 schematically shows a cross-sectional view through a
self-adhesive moisture control label;
[0030] FIG. 3 schematically shows product packaging having a
moisture control label adhered thereto;
[0031] FIG. 4 schematically shows a moisture control label in a wet
state; and
[0032] FIG. 5 schematically shows a moisture control label in a dry
state.
DETAILED DESCRIPTION
[0033] FIGS. 1 and 2 show a self-adhesive moisture control label 10
for product packaging. In this particular embodiment the label 10
is intended to be adhered to product packaging so as to provide
moisture to the atmosphere within the packaging. As will be
described in detail below, the label 10 comprises a base layer 12
and a water absorbent layer 14 which is adhered to the upper side
of the base layer 12. The lower side of the base layer 12 is
provided with an adhesive layer 30 such that the label 10 can be
adhered to product packaging. In use, a small amount of water is
provided to the water absorbent layer 14 which is absorbed and
retained by the water absorbent layer 14. The water retained by the
water absorbent layer 14 is then able to evaporate from the water
absorbent layer 14 so as to provide moisture to the atmosphere
within the product packaging. The label 10 therefore acts to
humidify the surrounding atmosphere.
[0034] The label 10 is substantially circular and comprises a
circular base layer 12 of a first diameter, and a circular water
absorbent layer 14 of a second diameter that is less than the first
diameter. In this embodiment the diameter of the base layer 12 (and
therefore the overall label 10) is approximately 50mm and the
diameter of the water absorbent layer 14 is approximately 25 mm.
The base layer 12 and water absorbent layer 14 are concentric with
one another and the base layer 12 extends beyond the periphery of
the water absorbent layer 14 to form a display region 15. It should
be appreciated that other shapes and dimensions could be used, and
the base layer 12 and water absorbent layer 14 could be positioned
differently with respect to one another. Although it has been
described that the base layer 12 is larger than the water absorbent
layer 14, in other embodiments the layers could be identically
sized, or the base layer 12 could be smaller than the water
absorbent layer 14.
[0035] As shown in FIG. 2, the base layer 12 is a laminate
structure comprising a lower film 16, a print layer 18 and an upper
film 20. The print layer 18 is therefore sandwiched between the
lower film 16 and the upper film 20 which acts as a protective
layer. In this embodiment, the lower film 16 is a layer of white
polypropylene having a thickness of approximately 60 .mu.m and the
upper film 20 is a layer of clear polypropylene having a thickness
of approximately 20 .mu.m. It should be appreciated that other
materials or thicknesses could be used. It should be noted that in
other embodiments the base layer 12 could be a single uniform layer
of film. The print layer 18 is directly printed onto the lower film
16 and may comprise any suitable colours, graphics, designs or
text. In this embodiment the print layer comprises a solid colour
which extends over the entire surface of the lower film 16,
branding information 22, instructions for use 24 and a graphical
indicium 26. The branding information 22 and the use instructions
24 are printed in the display region 15 beyond the water absorbent
layer 14, whilst the graphical indicium 26 is printed in a region
underneath the water absorbent layer 14. The function of the
graphical indicium 26 will be described in detail below. The lower
surface of the lower film 16 (and hence the lower surface of the
base layer 12) is provided with a layer of pressure sensitive
adhesive 30. The adhesive layer 30 may either be a continuous or a
discontinuous coating. The adhesive layer 30 allows the label 10 to
be adhered to product packaging. In other embodiments the print
layer 18 may be separate from the base layer 12.
[0036] The water absorbent layer is in the form of a fibrous pad 14
which can absorb and retain water, and from which water can
evaporate. In this embodiment the fibrous pad 14 is non-woven and
is made from matted polyolefin fibres. The diameter, thickness and
density of the fibrous pad 14 may be chosen such that the fibrous
pad can absorb a required volume of water. For example, a
polyolefin fibrous pad 14 having a 25 mm diameter, a thickness of
1.5 mm and a density of between 0.1-0.2 g/cm.sup.3 may absorb
approximately 0.6 ml of water. In another example, a polyolefin
fibrous pad 14 having a 31 mm diameter, a thickness of 1 mm and a
density of between 0.1-0.2 g/cm.sup.3 may absorb approximately 0.6
ml of water. The lower surface of the fibrous pad 14 is provided
with a layer of pressure sensitive adhesive 32 which adheres the
fibrous pad 14 to the upper surface of the upper film 20 of the
base layer 12.
[0037] The polyolefin fibrous pad 14 permits visible light to pass
through it. However, the opacity of the fibrous pad 14 is the
function of the amount of water retained by it. In particular, when
the fibrous pad 14 is completely dry it has a higher opacity, and
when it is completely saturated with water it has a lower opacity.
The Applicant believes that this phenomena is due to the fibres
reflecting light when dry, but allowing light to pass through them
when wet. As will be described in detail below, this means that in
use, the graphical indicium 26 printed on the base layer 12 becomes
less visible as the fibrous pad 14 dries out. This may provide a
useful indicator to the use that the fibrous pad 14 needs to be
wetted.
[0038] A particular benefit of the fibrous pad 14 is that it
maintains its integrity and tends not to fragment. This may be
particularly important as it may be important to prevent fragments
of the fibrous pad 14 being mixed with the product which is
contained within the product packaging.
[0039] Although it has been described that the water absorbent
layer 14 is a polyolefin fibrous pad 14, it should be appreciated
that other materials could be used. The water absorbent layer 14
could be any woven or non-woven fibrous material and could be made
from materials other than polyolefin fibres such as polyethylene
terephthalate (PET) fibres, polyethylene (PE) fibres, nylon fibres,
polyvinyl chloride (PVC) fibres, or polylactic acid (PLA) fibres,
for example. In some embodiment the water absorbent layer may
comprise a mixture of polymer fibres, such as any combination of
the polymer fibres listed above. Further, the water absorbent layer
14 could be a sponge-like porous material capable of absorbing
water, or could be a hydrophilic material such as a layer of a
hydrophilic gel. Essentially, the water absorbent layer 14 could be
made from any suitable material that is capable of absorbing and
retaining water, and which allows water to subsequently evaporate
from it.
[0040] Self-adhesive moisture control labels 10 may be provided on
a wound backing sheet as a reel of labels. The labels 10 may then
be applied either manually, or automatically, or by a combination
of the two to product packaging.
[0041] A reel of moisture control labels 10 may be manufactured by
the following method:
[0042] A web of lower film material 16 is printed with the desired
print layer 18 which continually repeats. A web of upper film
material 20 is then applied over the print layer 18 to provide a
protective barrier. A pressure sensitive adhesive layer 30 is then
applied to the underside of the lower film material 16 and the
laminate structure is releasably adhered to a web of backing
material. The individual base layers 12 are then die cut from the
laminate and the skeleton (or mask) is removed.
[0043] A web of water absorbent material 14, such as a web of
polyolefin fibrous material, is coated on its lower surface with a
pressure sensitive adhesive layer 32. This is web is then
releasably adhered to a web of backing material. The individual
water absorbent layers 14 (or fibrous pads) are then die cut from
the web and the skeleton (or mask) is removed.
[0044] The individual base layers 12 and water absorbent layers 14
are then assembled together to form a moisture control label 10.
Specifically, by machine, the individual water absorbent layers 14
are peeled from the backing sheet and applied to the upper surface
of individual base layers 12 which remain on the backing sheet. The
backing sheet, having the assembled base layers 12 and water
absorbent layers 14, is then wound-up to provide a reel of
self-adhesive moisture control labels.
[0045] FIG. 3 shows product packaging in the form of a tub 100 for
containing loose (or rolling) tobacco. The tub 100 is generally
cylindrical and comprises a container base 102 having a cylindrical
wall and a circular base, and a circular lid 104 which can be
removably attached to the container base 102. The loose tobacco is
stored within the container base 102 and the lid 104 is attached to
the container base 102 in order to close the tub 100. Before the
tub 100 has been opened for the first time a foil seal (not shown)
hermetically seals the container base 102 and maintains the
freshness of the tobacco. However, once this has been removed to
obtain access to the tobacco for the first time, the lid 104 does
not seal the container base 102 to the same extent.
[0046] It is desirable to prevent the tobacco from drying out as
this can adversely affect its quality. Therefore, a self-adhesive
moisture control label 10 is applied to the underside of the lid
104 so that it is disposed within the tub 100 when the lid 104 is
attached to the container base 102. The label 10 may be adhered to
the lid from a reel of labels 10 during manufacture of the
packaging and may be applied either by hand, or by machine, or by a
combination of the two. In another arrangement the label 10 may be
disposed within the tub 100 with the tobacco and the consumer may
have to adhere the label 10 to the inside of the lid.
[0047] Once tub 100 has been opened by removing the lid 104 and the
foil seal (not shown), the consumer must wet the fibrous pad 14 of
the label 10. The instructions for use of the label 10, together
with branding information, is provided on the display region 15 of
the base layer 12 which means that it is not necessary to provide
any additional inserts or instructions for use. The use
instructions 24 may direct the consumer to add a certain amount of
water to the fibrous pad 14. In this embodiment, the consumer is
directed to add 6 drops of water to the fibrous pad 14. The lid 104
is then attached to the container base 102 with the label 10
disposed within the tub 100. Over time, water evaporates from the
fibrous pad 14 which acts to provide moisture to the atmosphere
within the tub 100, humidifying the atmosphere, and preventing the
tobacco from drying out. The label 10 therefore acts to maintain
the quality of the tobacco.
[0048] Referring now to FIGS. 4 and 5, as described above, the
opacity of the water absorbent layer 14 (fibrous pad) changes as
the volume of water retained by the fibrous pad 14 changes. In
particular, the opacity of the fibrous pad 14 increases as the
volume of water retained reduces. Therefore, when the fibrous pad
14 is saturated with water (i.e. when the consumer has added the
prescribed number of drops of water), the opacity of the fibrous
pad 14 is relatively low and therefore the graphical indicium 26
printed on the base layer 12 below the fibrous pad 14 is visible
through the fibrous pad 14 (FIG. 4). However, as the water
evaporates from the fibrous pad 14 and the fibrous pad 14 becomes
drier, the opacity of the fibrous pad increases. Therefore, as the
fibrous pad 14 becomes drier the graphical indicium 26 becomes less
visible, until the fibrous pad 14 completely dries out and the
graphical indicium 26 becomes its least visible (FIG. 5). It should
be appreciated that even when dry, the graphical indicium 26 may be
partly visible, if feint.
[0049] The change in opacity of the fibrous pad 14 in conjunction
with the graphical indicium 26 disposed below it provides a useful
indication to the consumer as to when it is necessary to add more
water to the fibrous pad 14 in order to ensure that the atmosphere
within the packaging is kept moist. The graphical indicium 26 may
be any graphic and may include branding relating to the product.
Although the change in opacity of the water absorbent layer 14 in
conjunction with the graphical indicium 26 located below it
provides a useful indicator, this is not essential to the
invention. In other embodiments there may be no graphical indicium,
and/or the water absorbent layer 14 may not change in opacity as a
function of the water absorbed/retained by it.
[0050] In the above embodiment it has been described that the label
10 is applied to a tub 100 for loose tobacco. However, it should be
appreciated that the label 10 could be used with other types of
packaging for loose tobacco such as pouches. Further, the label 10
may be used with packaging for other tobacco products such as
cigarettes, cigars, snuff or snus. As opposed to being applied to
packaging during manufacture, the labels 10 may be sold separately
to the end-user who may apply them to various types of packaging or
container as appropriate. For example, a label 10 could be applied
by an end-user to a tin within which is stored loose tobacco, or a
case for storing cigars or cigarettes.
[0051] It has been described that the label 10 is used to prevent
tobacco from drying out. However, it could be used to prevent other
products such as perishable goods, processed foods, fresh foods,
plants/flowers, agricultural compounds, seeds, pharmaceuticals,
cosmetics, domestic or household chemicals, industrial chemicals,
electronic components, instrumentation and devices, clothing or
garments, footwear, luggage or bags, stationary or documentation,
artwork or photography, jewellery, or musical instruments from
drying out, or becoming too wet (as described below), and
spoiling.
[0052] Although it has been described that the moisture control
label 10 is for providing moisture to an atmosphere in order to
prevent a product, such as tobacco, from drying out, the label 10
could work in the opposite manner. For example, the label 10 could
be applied to packaging, such as a tin or tub, for biscuits and the
water absorbent layer 14 could absorb moisture from the atmosphere
to prevent the biscuits from absorbing water and becoming soft or
stale. In another embodiment the label 10 could be adhered to salad
packaging, such as a filmic bag, and in use could absorb water from
the salad to prevent it from becoming overly wet.
[0053] In another embodiment, the label may simply comprise a
self-adhesive water absorbent layer 14, such as a fibrous pad,
which can be adhered to product packaging. In such an embodiment
the label would comprise the water absorbent layer 14 and the
adhesive 32. The label could be applied to product packaging over a
graphical indicium printed or otherwise provided on the packaging
itself. As for the first embodiment, the water absorbent layer 14
would change in opacity as a function of the water retained by it
and therefore the graphical indicium on the packaging would become
more visible as the label gets wetter, and less visible as the
label gets drier.
[0054] Due to the material properties of the fibrous pad, in
particular the density and substantially uniform structure, the
fibrous pad can be saturated with a specific known and reproducible
volume of water. This allows a fibrous pad to be designed so as to
hold a desired volume of water which is appropriate to the
particular application. This ensures that the fibrous pad cannot be
overfilled which helps to reduce the risk of damaging the product
with which it is to be used.
[0055] In some embodiments, the material properties allow a
relatively large fibrous pad to be manufactured, which holds a
relatively small volume of water.
[0056] Where the term "layer" has been used in the foregoing
specification, this should be understood as encompassing either a
continuous or discontinuous layer (such as a grid or a series of
discrete spots). For example, the adhesive layer 30 may be a
continuous film of adhesive, or could be a series of stripes, or a
grid, or spots.
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