CA2159925C - Absorbent article having adhesive fastening means - Google Patents
Absorbent article having adhesive fastening means Download PDFInfo
- Publication number
- CA2159925C CA2159925C CA 2159925 CA2159925A CA2159925C CA 2159925 C CA2159925 C CA 2159925C CA 2159925 CA2159925 CA 2159925 CA 2159925 A CA2159925 A CA 2159925A CA 2159925 C CA2159925 C CA 2159925C
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- CA
- Canada
- Prior art keywords
- adhesive
- pantiliner
- article according
- perimeter
- stretchable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
An elastically stretchable, absorbent article, such as a pantiliner, is provided for adhesive attachment to an undergarment. A stretchable adhesive is applied to a major portion of the surface of the article, the adhesive extending at least substantially to its perimeter over a major portion of the perimeter.
Adhesive patterns which can be used include ones in which adhesive-free regions are left at the ends or corners of the article, and ones in which there is a narrow, adhesive-free strip extending along at least a substantial part of the perimeter.
Adhesive patterns which can be used include ones in which adhesive-free regions are left at the ends or corners of the article, and ones in which there is a narrow, adhesive-free strip extending along at least a substantial part of the perimeter.
Description
AHSORHENT ARTICLE HAVING ADHESIVE FASTENING MEANS
This invention relates to an absorbent article having adhesive fastening means for attaching such an article to an undergarment. The invention is particularly concerned with a pantiliner, and, more particularly, a thin pantiliner, which, in use, is attached to the crotch region of the user's panty by means of adhesive. The following description is particularly concerned with such pantiliners. It is to be understood, however, that the invention is also applicable to sanitary napkins, incontinent pads, and other articles which are designed to absorb and retain liquid and other discharges from the human body.
The use of an adhesive, usually referred to as panty fastening adhesive, is well known in the above context, and attention is directed to International Patent Publications Nos. WO 92/04000 (Papa et al) and WO
93/01785 (Osborn et al) which include descriptions of various patterns in which the panty fastening adhesive may be applied. It is obj ect of the present invention to provide an absorbent article in which the panty fastening adhesive is applied thereto in a pattern which is particularly advantageous.
The Osborn patent publication identified above describes sanitary articles which are elastic, and some of which have a thickness of as little as about 3mm.
This invention relates to an absorbent article having adhesive fastening means for attaching such an article to an undergarment. The invention is particularly concerned with a pantiliner, and, more particularly, a thin pantiliner, which, in use, is attached to the crotch region of the user's panty by means of adhesive. The following description is particularly concerned with such pantiliners. It is to be understood, however, that the invention is also applicable to sanitary napkins, incontinent pads, and other articles which are designed to absorb and retain liquid and other discharges from the human body.
The use of an adhesive, usually referred to as panty fastening adhesive, is well known in the above context, and attention is directed to International Patent Publications Nos. WO 92/04000 (Papa et al) and WO
93/01785 (Osborn et al) which include descriptions of various patterns in which the panty fastening adhesive may be applied. It is obj ect of the present invention to provide an absorbent article in which the panty fastening adhesive is applied thereto in a pattern which is particularly advantageous.
The Osborn patent publication identified above describes sanitary articles which are elastic, and some of which have a thickness of as little as about 3mm.
2'~ 599 2 5 Even thinner sanitary articles, in the form of pantiliners, are now being manufactured. Some of these have a thickness of less than 2mm and, in some cases, less than lmm. Such articles are highly flexible and, because of their elasticity, are potentially able to follow the stretch of the panty in use.
However, these very characteristics pose potential problems in relation to the panty fastening adhesive.
Unless that is appropriately applied, there is a tendency for the panty movement to cause bunching of the pantiliner so that it tends to separate itself from the panty, and to curl and stick to itself. Furthermore, the adhesive connection between the panty and the pantiliner must be such that it does not impair the elastic properties of the pantiliner, or at least does not do so to any significant extent. It is an aspect of an object of the present invention to provide an adhesively pattern which is able to deal with these problems.
According to the present invention there is provided a stretchable, absorbent article for adhesive attachment to an undergarment, wherein a stretchable adhesive is applied to a surface of the article, the surface being outwardly defined by a perimeter, the adhesive being applied to a major portion of the surface, and extending substantially to the perimeter over from 50o to 900 of the perimeter.
A
.-Preferably the adhesive extends completely to the perimeter or, if there is a gap between the edge of the adhesive and the perimeter, the gap is not more than 3mm, and more preferably from 1 to 2mm in width.
Some embodiments of the invention will now be described with reference to Figures 1 to 4 of the accompanying drawings, which are plan views of pantiliners of hourglass shape, showing that face of the pantiliner which carries the panty fastening adhesive.
Each of Figures 1 to 4 shows a pantiliner of the same shape and size. In one emodiment, it has a length of about 153mm, a maximum width of about 67mm, and a minimum width of about 5lmm. It is to be understood that the pantiliner could have other dimensions and/or be of some other shape, e.g. rectangular.
The pantiliner has an absorbent layer of which one face is adhesively bonded to a liquid-impermeable backsheet and the other face may be covered by a liquid permeable topsheet to which it is adhesively bonded. The absorbent layer may itself consist of a plurality of sub-layers having different characteristics. The pantiliner may be either non-elastically stretchable or (and this is preferred) elastically stretchable. Where i 2i599~~
However, these very characteristics pose potential problems in relation to the panty fastening adhesive.
Unless that is appropriately applied, there is a tendency for the panty movement to cause bunching of the pantiliner so that it tends to separate itself from the panty, and to curl and stick to itself. Furthermore, the adhesive connection between the panty and the pantiliner must be such that it does not impair the elastic properties of the pantiliner, or at least does not do so to any significant extent. It is an aspect of an object of the present invention to provide an adhesively pattern which is able to deal with these problems.
According to the present invention there is provided a stretchable, absorbent article for adhesive attachment to an undergarment, wherein a stretchable adhesive is applied to a surface of the article, the surface being outwardly defined by a perimeter, the adhesive being applied to a major portion of the surface, and extending substantially to the perimeter over from 50o to 900 of the perimeter.
A
.-Preferably the adhesive extends completely to the perimeter or, if there is a gap between the edge of the adhesive and the perimeter, the gap is not more than 3mm, and more preferably from 1 to 2mm in width.
Some embodiments of the invention will now be described with reference to Figures 1 to 4 of the accompanying drawings, which are plan views of pantiliners of hourglass shape, showing that face of the pantiliner which carries the panty fastening adhesive.
Each of Figures 1 to 4 shows a pantiliner of the same shape and size. In one emodiment, it has a length of about 153mm, a maximum width of about 67mm, and a minimum width of about 5lmm. It is to be understood that the pantiliner could have other dimensions and/or be of some other shape, e.g. rectangular.
The pantiliner has an absorbent layer of which one face is adhesively bonded to a liquid-impermeable backsheet and the other face may be covered by a liquid permeable topsheet to which it is adhesively bonded. The absorbent layer may itself consist of a plurality of sub-layers having different characteristics. The pantiliner may be either non-elastically stretchable or (and this is preferred) elastically stretchable. Where i 2i599~~
the latter is the case, at least one of the layers of the pantiliner (and for this purpose the term "layer"
includes the adhesive connection between the absorbent layer and the backsheet and, if present, the adhesive connection between the absorbent layer and the topsheet) is elastic, and all layers which are not elastic are at least stretchable. By this means the article as a whole is rendered elastic. Further details of this can be found in our Italian Patent Application identified above. Where the pantiliner is to be non-elastically stretchable, no elastic layer is required.
For present purposes it is sufficient to note that the pantiliner just described has panty fastening adhesive applied to the aforementioned backsheet, and it is the disposition of this panty fastening adhesive which is shown in Figures 1 to 4. As supplied to the user, the face of the backsheet to which the panty fastening adhesive is applied is covered by a protective release layer, but this is removed by the user prior to use.
Since the adhesive covers substantially the whole surface of the pantiliner, the panty fastening adhesive must be stretchable, in the sense that if the pantiliner stretches then so must the adhesive, without the adhesive breaking.
In each of Figures 1 to 4 a small area of the backsheet is left free of adhesive. As will be seen, in the case of Figure 1 the adhesive-free areas are at the '~' 215992 ends. The adhesive-free end portions each preferably extend a distance from 2mm to 4mm, more preferably about 3mm, from the end of the pantiliner. In Figure 2 the adhesive-free areas are at the corners. The width of each of the four adhesive-free portions, i.e. the distance from the lateral edge of the adhesive to the point at which the pantiliner has its greatest width, is preferably from 2mm to 4mm, more preferably about 3mm.
In Figure 3 there is a narrow-adhesive free strip running around the perimeter of the backsheet. The width of the adhesive-free strip is preferably less than 3mm, and more preferably from 1 to 2mm. The pattern shown in Figure 4 is the same as that shown in Figure 3, except that the adhesive-free strip is broken at opposite ends of the pantiliner by adhesive which extends to the very edge of the pantiliner.
It will be seen that in each of the patterns shown in Figures 1 and 2, the adhesive extends to the very edge of the pantiliner over at least a major portion of the perimeter thereof, i.e. more than 50$, preferably more than about 65~. In the case of Figure 1 the proportion is preferably from 75~ to 90$, more preferably from 80~ to 85~. In the case of Figure 2 the proportion is preferably from 70$ to 90~, more preferably from 75~ to 85~.
In the case of the patterns of Figures 3 and 4 the adhesive does not extend to the very edge of the pantiliner (except over a short distance in the case of ,.-Figure 4), but extends to a point very close to that edge over the whole of the perimeter.
It has been found that the provision of a stretchable adhesive at or adjacent the perimeter of a stretchable pantiliner over a major portion of the perimeter, and over a major portion of the total area of the pantiliner, enables the pantiliner to retain a secure grip on the panty during movement of the latter, and avoids, or at least reduces, the tendency of the pantiliner to bunch and wrinkle and, not infrequently, stick to itself. The effect thus provided is particularly advantageous in the context of an elastic pantiliner, such as the very thin elastic pantiliner described in our above- mentioned Italian Patent Application.
Suitable panty fastening adhesives which can be used include SAVARE LA203* (produced by Savare I.C.S.r.l.) and KORAMELT 869* produced by Kommerling Chemische Fabrik K.G.. Both of these are SEBS
(styrene-ethylene-butylene- styrene) block copolymer based, hot melt adhesives which are stretchable in the sense mentioned above.
The adhesive is preferably applied with a basis weight of about 24g/m2 by coating, for example using a slot die coater, or by spraying or by printing.
It is desirable that, where a pantiliner is adhesively fastened to a panty, it should be gas-permeable, though liquid-impermeable, so as to allow * Trade-mark . ~ 2159925 water vapour to pass through it . To this end, not only must the backsheet be gas-permeable, but its permeability must not be too greatly impaired by the panty fastening adhesive.
Tests were done to determine the permeability to water vapour of various pantiliner materials, including material from two known pantiliners, and the permeability of a sample of material from the crotch of a cotton panty. The results were as follows:
1. Sample from pantiliner according to the invention, with PFA (panty fastening adhesive) pattern of Fig. 1 @ 24g/m2: 980g/m2.day.
2. Sample from same pantiliner but without any PFA: 1407g/m2.day.
3. Carefree* Light New Sensitive:
918g/m2.day.
4. Always Pantiliner: 150g/m2.day.
includes the adhesive connection between the absorbent layer and the backsheet and, if present, the adhesive connection between the absorbent layer and the topsheet) is elastic, and all layers which are not elastic are at least stretchable. By this means the article as a whole is rendered elastic. Further details of this can be found in our Italian Patent Application identified above. Where the pantiliner is to be non-elastically stretchable, no elastic layer is required.
For present purposes it is sufficient to note that the pantiliner just described has panty fastening adhesive applied to the aforementioned backsheet, and it is the disposition of this panty fastening adhesive which is shown in Figures 1 to 4. As supplied to the user, the face of the backsheet to which the panty fastening adhesive is applied is covered by a protective release layer, but this is removed by the user prior to use.
Since the adhesive covers substantially the whole surface of the pantiliner, the panty fastening adhesive must be stretchable, in the sense that if the pantiliner stretches then so must the adhesive, without the adhesive breaking.
In each of Figures 1 to 4 a small area of the backsheet is left free of adhesive. As will be seen, in the case of Figure 1 the adhesive-free areas are at the '~' 215992 ends. The adhesive-free end portions each preferably extend a distance from 2mm to 4mm, more preferably about 3mm, from the end of the pantiliner. In Figure 2 the adhesive-free areas are at the corners. The width of each of the four adhesive-free portions, i.e. the distance from the lateral edge of the adhesive to the point at which the pantiliner has its greatest width, is preferably from 2mm to 4mm, more preferably about 3mm.
In Figure 3 there is a narrow-adhesive free strip running around the perimeter of the backsheet. The width of the adhesive-free strip is preferably less than 3mm, and more preferably from 1 to 2mm. The pattern shown in Figure 4 is the same as that shown in Figure 3, except that the adhesive-free strip is broken at opposite ends of the pantiliner by adhesive which extends to the very edge of the pantiliner.
It will be seen that in each of the patterns shown in Figures 1 and 2, the adhesive extends to the very edge of the pantiliner over at least a major portion of the perimeter thereof, i.e. more than 50$, preferably more than about 65~. In the case of Figure 1 the proportion is preferably from 75~ to 90$, more preferably from 80~ to 85~. In the case of Figure 2 the proportion is preferably from 70$ to 90~, more preferably from 75~ to 85~.
In the case of the patterns of Figures 3 and 4 the adhesive does not extend to the very edge of the pantiliner (except over a short distance in the case of ,.-Figure 4), but extends to a point very close to that edge over the whole of the perimeter.
It has been found that the provision of a stretchable adhesive at or adjacent the perimeter of a stretchable pantiliner over a major portion of the perimeter, and over a major portion of the total area of the pantiliner, enables the pantiliner to retain a secure grip on the panty during movement of the latter, and avoids, or at least reduces, the tendency of the pantiliner to bunch and wrinkle and, not infrequently, stick to itself. The effect thus provided is particularly advantageous in the context of an elastic pantiliner, such as the very thin elastic pantiliner described in our above- mentioned Italian Patent Application.
Suitable panty fastening adhesives which can be used include SAVARE LA203* (produced by Savare I.C.S.r.l.) and KORAMELT 869* produced by Kommerling Chemische Fabrik K.G.. Both of these are SEBS
(styrene-ethylene-butylene- styrene) block copolymer based, hot melt adhesives which are stretchable in the sense mentioned above.
The adhesive is preferably applied with a basis weight of about 24g/m2 by coating, for example using a slot die coater, or by spraying or by printing.
It is desirable that, where a pantiliner is adhesively fastened to a panty, it should be gas-permeable, though liquid-impermeable, so as to allow * Trade-mark . ~ 2159925 water vapour to pass through it . To this end, not only must the backsheet be gas-permeable, but its permeability must not be too greatly impaired by the panty fastening adhesive.
Tests were done to determine the permeability to water vapour of various pantiliner materials, including material from two known pantiliners, and the permeability of a sample of material from the crotch of a cotton panty. The results were as follows:
1. Sample from pantiliner according to the invention, with PFA (panty fastening adhesive) pattern of Fig. 1 @ 24g/m2: 980g/m2.day.
2. Sample from same pantiliner but without any PFA: 1407g/m2.day.
3. Carefree* Light New Sensitive:
918g/m2.day.
4. Always Pantiliner: 150g/m2.day.
5. Cotton panty crotch: 2300g/m2.day.
The pantiliner which constituted item (1) above consisted of the following layers:
Topsheet Elastic covering structure as described in our Italian Patent No. 1,268,108, filed on the same date as this application, 60 g/m2 Topsheet/core Savare PM 17*all over coated, 10 g/m2 adhesive Core Spunlaced nonwoven 70~ rayon/30$ PET, 50 g/m2 * Trade-mark.
A
. 21 599 2 5 s Core/backsheet Elastic hot melt adhesive as described in adhesive our Italian Patent No. 1,268,104.
filed on the same date as this application, all over coated 20 g/m2 Backsheet Spunlaced nonwoven 100 PP, 40 g/m2 PFA Savare LA 203, 24 g/m2 Release Silcone coated paper, 95 g/m2 layer In the case of item (3) above, the adhesive is in the form of three parallel stripes extending along its length. In the case of item (4), the adhesive is applied in a single stripe 40mm wide which extends along the length of the product and almost reaches the welded edges thereof.
It will be seen that using the adhesive at a relatively low basis weight (24g/m2), the reduction in permeability to water vapour produced by the adhesive was only about 30$ (comparing items 1 and 2), and the resulting value was still higher than the known product of item (3). The method by which the permeability to water vapour was determined was as follows. A sample of the product concerned, measuring 50mm x 50mm, (taken, in the case of item ( 1 ) from the centre of the pantiliner, and thus completely coated with adhesive) was mounted over the open end of .a cylindrical container having a height of 30mm and an internal diameter of 26mm, containing 5m1 of distilled water. The test apparatus is held at a temperature of A
23°C - 2°, and at a humidity of 50$ - 2~. Air is then caused to flow over the exposed surface of the sample at a rate of 2.5 to 3m/s. The water vapour permeability (WVP) measured in g/m2.day is then calculated from the following equation PO = weight at time 0 hours P24 = weight at time 24 hours Sc = area of sample exposed to air flow.
The pantiliner which constituted item (1) above consisted of the following layers:
Topsheet Elastic covering structure as described in our Italian Patent No. 1,268,108, filed on the same date as this application, 60 g/m2 Topsheet/core Savare PM 17*all over coated, 10 g/m2 adhesive Core Spunlaced nonwoven 70~ rayon/30$ PET, 50 g/m2 * Trade-mark.
A
. 21 599 2 5 s Core/backsheet Elastic hot melt adhesive as described in adhesive our Italian Patent No. 1,268,104.
filed on the same date as this application, all over coated 20 g/m2 Backsheet Spunlaced nonwoven 100 PP, 40 g/m2 PFA Savare LA 203, 24 g/m2 Release Silcone coated paper, 95 g/m2 layer In the case of item (3) above, the adhesive is in the form of three parallel stripes extending along its length. In the case of item (4), the adhesive is applied in a single stripe 40mm wide which extends along the length of the product and almost reaches the welded edges thereof.
It will be seen that using the adhesive at a relatively low basis weight (24g/m2), the reduction in permeability to water vapour produced by the adhesive was only about 30$ (comparing items 1 and 2), and the resulting value was still higher than the known product of item (3). The method by which the permeability to water vapour was determined was as follows. A sample of the product concerned, measuring 50mm x 50mm, (taken, in the case of item ( 1 ) from the centre of the pantiliner, and thus completely coated with adhesive) was mounted over the open end of .a cylindrical container having a height of 30mm and an internal diameter of 26mm, containing 5m1 of distilled water. The test apparatus is held at a temperature of A
23°C - 2°, and at a humidity of 50$ - 2~. Air is then caused to flow over the exposed surface of the sample at a rate of 2.5 to 3m/s. The water vapour permeability (WVP) measured in g/m2.day is then calculated from the following equation PO = weight at time 0 hours P24 = weight at time 24 hours Sc = area of sample exposed to air flow.
Claims (16)
1. A stretchable, absorbent article for adhesive attachment to an undergarment, wherein a stretchable adhesive is applied to a surface of the article, said surface being outwardly defined by a perimeter, the adhesive being applied to a major portion of said surface, and extending substantially to said perimeter over from 50% to 90% of said perimeter.
2. An article according to claim 1, wherein the adhesive extends completely to said perimeter over from 50% to 90% of said perimeter.
3. An article according to claim 2, wherein said surface has at least one adhesive-free region.
4. An article according to claim 3, which is elongate and which as an adhesive-free region at each and end thereof.
5. An article according to claim 3, which is hourglass and has an adhesive-free region at each corner thereof.
6. An article according to claim 1, wherein the said surface has an adhesive-free region in the form of a narrow adhesive-free strip extending along at least a substantial part of said perimeter.
7. An article according to claim 6, wherein said strip extends completely along said perimeter.
8. An article according to claim 1, which is in the form of a pantiliner.
9. An article according to claim 4, which is in the form of a pantiliner and in which each of said adhesive-free regions extends a distance of from 2 to 4mm from an adjacent end of the pantiliner.
10. An article according to claim 9, wherein said distance is about 3mm.
11. An article according to claim 5, which is in the form of a pantiliner and in which each of said adhesive-free regions extends a distance of from 2 to 4mm from an adjacent lateral edge of the pantiliner.
12. An article according to claim 11, wherein said distance is about 3mm.
13. An article according to claim 6, which is in the form of a pantiliner and in which said adhesive-free strip has a width of less than 3mm.
14. An article according to claim 13, wherein said width is from 1 to 2mm.
15. An article according to claim 1, wherein said stretchable adhesive is based on a styrene-ethylene-butylene-styrene block copolymer.
16. An article according to claim 1, which is elastically stretchable.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITTO94A000801 | 1994-10-07 | ||
| IT94TO000801A IT1268107B1 (en) | 1994-10-07 | 1994-10-07 | Absorbent article with adhesive fixing means |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2159925A1 CA2159925A1 (en) | 1996-04-08 |
| CA2159925C true CA2159925C (en) | 2000-01-18 |
Family
ID=11412820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2159925 Expired - Lifetime CA2159925C (en) | 1994-10-07 | 1995-10-05 | Absorbent article having adhesive fastening means |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2159925C (en) |
| IT (1) | IT1268107B1 (en) |
-
1994
- 1994-10-07 IT IT94TO000801A patent/IT1268107B1/en active IP Right Grant
-
1995
- 1995-10-05 CA CA 2159925 patent/CA2159925C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2159925A1 (en) | 1996-04-08 |
| ITTO940801A1 (en) | 1996-04-07 |
| ITTO940801A0 (en) | 1994-10-07 |
| IT1268107B1 (en) | 1997-02-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20151005 |