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Absorbent article having liquid swellable material coated breathable backsheet

A product and film technology, which is applied in the field of breathable film, can solve the problems of not eliminating wetness, lower protection level, and inability to use breathable film, etc.

Inactive Publication Date: 2000-10-11
THE PROCTER & GAMBLE COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the data given in the patent, the liquid passage is not blocked to a large extent, so that these meshes do not eliminate the wet-through problem
[0012] Therefore, since the introduction of breathable backsheets in absorbent articles results in a reduced level of protection, further product comfort improvements such as reduced product thickness and increased product flexibility (which would further exacerbate the problem) do not appear to be available in absorbent articles. breathable backsheet
Thus, there are two sides to the problem in the resulting approach, namely the need to improve the comfort of the absorbent product to the consumer on the one hand and to provide an acceptable level of protection to the absorbent product on the other hand.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] This example is a backsheet consisting of two layers, the first and second layers both comprising polyester non-woven fabric with a basis weight of 40 g / m 2 , (obtained from Suominen, Finland, trade designation F 4100 / 40). The surface of the second layer facing the wearer is coated with a water-based acrylic adhesive, (obtained by Rohm and Haas Co., USA, the product code is EP 5560 F, and the basis weight is 10g / m 2 ). Then apply 50g / m2 on the entire wearer facing surface 2 Acrylic superabsorbent powder (available from Hoechst A.G., Germany, trade designation Sanwet 3746-1). Next the garment facing surface of the first layer is placed on the wearer facing surface of the second layer. Position the first and second layers together with staples along the perimeter of the layers.

[0074] Air permeability in dry state = 4000l / (m 2 .s)

[0075] Air permeability in wet state=4l / (m 2 .s)

[0076] Thickness in dry state = 850μm

[0077] Thickness in wet state = 2390μm ...

Embodiment 2

[0081] This embodiment is the same as Example 1, except that the swellable material is made of locust bean gum powder (purchased from Franco Vanni Italy, the trade name is Albagum, quantitatively 43g / m 2 ) instead. Using water-based acrylic adhesive (purchased from Rohm and Haas Co., the code name is EP 5560 F, the basis weight is 6g / m 2 ) bonding locust bean gum powder to the wearer facing surface of the first layer.

[0082] Air permeability in dry state=7350l / (m 2 .s)

[0083] Air permeability in wet state=4l / (m 2 .s)

[0084] Thickness in dry state = 825μm

[0085] Thickness in wet state = 1140μm

[0086] Swelling rate in the z direction (Δ%) = 38%

Embodiment 3

[0088] This embodiment is the same as embodiment 2, but the second layer is covered with a perforated formed film (available from Tredegar Co., USA, the product code is S-225 MD 25, the basis weight is 25g / m 2 ) instead. The wearer-facing surface of the second layer is coated with a water-based acrylic adhesive (available from Rohm and Haas Co., code name EP5560 F, basis weight 10 g / m 2 ) adhesive layer, and apply a quantitative 14g / m 2 Locust bean gum powder (available from Franco Vanni Italy, trade name is Albagum).

[0089] The water-swellable material is discontinuously applied to the wearer-facing surface of the apertured formed film, ie the cone protrudes from the surface.

[0090] Air permeability in dry state=645l / (m 2 .s)

[0091] Air permeability in wet state=24l / (m 2 .s)

[0092] Thickness in dry state = 800μm

[0093] Thickness in wet state = 1050μm

[0094] Swelling rate in the z direction (Δ%) = 31%

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PUM

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Abstract

The present invention relates to absorbent articles such as sanitary napkins and panty liners comprising a topsheet, absorbent core and backsheet which are breathable by the incorporation of a breathable backsheet and have a reduced tendency to exhibit garment wet through. The backsheet comprises at least one air permeable layer such as an apertured formed film or fibrous layer which is applied and preferably coated with a non-soluble, liquid swellable material, such as polyvinyl alcohol. Upon contact with fluid discharge, the material swells and closes the apertures of the layer, thereby reducing air permeability and preventing the passage of liquid through the layer and thus through the backsheet onto the garment of the wearer of the article.

Description

field of invention [0001] The present invention relates to the provision of breathable backsheets for use in absorbent articles which are activated upon contact with liquids to prevent wet out of the garments. Background of the invention [0002] A major consumer demand that has underpinned the development of the absorbent article field, especially menstrual products, is the provision of products with a high level of protection and comfort. [0003] One approach to providing comfort benefits to consumers in absorbent articles is to provide breathable products. Breathability has generally focused on the incorporation of so-called "breathable backsheets" in absorbent articles. Commonly used breathable backsheets are directionally liquid transport microporous films and apertured formed films such as those disclosed in US 4,591,523. All of these types of breathable backsheets are water vapor permeable, allowing gas exchange with the surrounding environment. This allows some o...

Claims

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Application Information

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IPC IPC(8): A61F13/56A61F13/00A61F13/15A61L15/00A61L15/60
CPCA61F13/51405A61F13/51403A61F2013/15552A61F13/15
Inventor 费比奥·查梅彻拉迈克尔·迪沃伊塔洛·科扎尼
Owner THE PROCTER & GAMBLE COMPANY