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EP0337296A2
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A fibrous composition for absorbent pads, a method for the manufacture of an absorbent material from such a composition, and an absorbent material produced by the method
Assignee: Angelini Ricerche SpA
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Filing: 1989-04-06
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Granted: —
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Expires: 2009-04-06
Abstract
Abstract A fibrous composition for absorbent pads which, in addition to cellulose fibres, also contains first and second synthetic polymeric materials. At least the second polymeric material is constituted by synthetic fibres which have a higher melting point than that of the first polymeric material. The fibrous mixture is formed into the desired shape, for example, an absorbent body for disposable sanitary products, by pneumatic means. The absorbent body thus formed is then heat-treated to a temperature higher than the melting point of the first polymeric material but lower than that of the second polymeric material for a period of time so as to melt the first polymeric material and form bonding points or bridges (5) between at least the synthetic fibres (4) which have not melted and which constitute the second polymeric material. The absorbent body is cooled to a temperature such that the first polymeric material sets, bonding at least the synthetic fibres together so as to form a framework containing the cellulose fibres (6).
Inventors
- 👤 Gianfranco Palumbo
- 👤 Giovanni Carlucci
- 👤 Antonio D'ambrosio
- 👤 Staffan Fors
- 👤 Birgitta Johansson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 23:02
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/48; A61F; A61F13/00; A61F13/15; A61F13/53; D; D01; D01F; D01F8/00; D01F8/04; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/425; D04H1/54; D04H1/541; D04H1/5412; D04H1/5414; D04H1/5418; D04H1/542; D04H1/544; D04H1/549; D04H1/55
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
64 words
An absorbent fibrous composition containing cellulose fibres and synthetic fibres, characterised in that, in addition to cellulose fibres, the mixture contains first (2, 2′) and second (3, 3′) synthetic polymeric materials, in that at least the second polymeric material is constituted by synthetic fibres, and in that the melting point of the first polymeric material is lower than that of the second polymeric material.
Claim 2
Dependent Claim
64 words
An absorbent fibrous composition containing cellulose fibres and synthetic fibres, characterised in that, in addition to cellulose fibres, the mixture contains first (2, 2′) and second (3, 3′) synthetic polymeric materials, in that at least the second polymeric material is constituted by synthetic fibres, and in that the melting point of the first polymeric material is lower than that of the second polymeric material.
Claim 3
Dependent Claim
31 words
A fibrous composition according to Claim 1, characterised in that at least one of the synthetic polymeric materials is treated with or incorporates a surfactant which makes the material permanently hydrophilic.
Claim 4
Dependent Claim
35 words
A fibrous composition according to Claim 1 or Claim 2, characterised in that at least 90% by weight of the synthetic fibres of the second polymeric material have lengths of between 3 and 60 mm.
Claim 5
Dependent Claim
32 words
A fibrous composition according to Claim 3, characterised in that at least 90% by weight of the synthetic fibres of the second polymeric material have lengths of between 5 and 20 mm.
Claim 6
Dependent Claim
35 words
A fibrous composition according to Claim 3 or Claim 4, characterised in that the synthetic fibres consist of a second component of two-component fibres of which a first component consists of the first polymeric material.
Claim 7
Dependent Claim
27 words
A fibrous composition according to Claim 5, characterised in that the synthetic fibres of the second polymeric material have a fineness of between 1 and 10 dtex.
Claim 8
Dependent Claim
28 words
A fibrous composition according to Claim 6, characterised in that the synthetic fibres have a fineness of between 1.5 and 7 dtex, preferably between 1.7 and 4.4 dtex.
Claim 9
Dependent Claim
22 words
A fibrous composition according to Claim 5, characterised in that the two components of the two-component fibre are arranged side by side.
Claim 10
Dependent Claim
30 words
A fibrous composition according to Claim 5, characterised in that the first component is arranged around the second component which has a higher melting point than the first polymeric material.
Claim 11
Dependent Claim
30 words
A fibrous composition according to any one of Claims 1 to 4, characterised in that it contains fibres of the first polymeric material and fibres of the second polymeric material.
Claim 12
Dependent Claim
31 words
A fibrous composition according to any one of Claims 8 to 10, characterised in that the two-component fibres and at least the fibres of the second polymeric material respectively, are curled.
Claim 13
Dependent Claim
32 words
A fibrous composition according to any one of Claims 1 to 11, characterised in that it contains from 2-80% by weight of synthetic fibres based on the total weight of the composition.
Claim 14
Dependent Claim
19 words
A fibrous composition according to Claim 12, characterised in that it contains from 10-40% by weight of synthetic fibres.
Claim 15
Dependent Claim
35 words
A fibrous composition according to any one of Claims 1 to 13, characterised in that the second polymeric material has a melting point at least 15C degrees higher than that of the first polymeric material.
Claim 16
Dependent Claim
72 words
A fibrous composition according to Claim 14, characterised in that the first polymeric material consists of any one of the following materials, that is polyethylene, polypropylene, copolymers of esters or of esters and other monomers, or copolymers of amides or of amides and other monomers, whilst the second polymeric material consists of any one of the following polymeric materials, namely polypropylene, polyester or polyamide in a combination with the first polymeric material.
Claim 17
Dependent Claim
61 words
A fibrous composition according to claim 2, characterised in that the surfactant consists of at least one of the following agents: a) an alkylphenol alkoxylate together with or in combination with a mixture of a mono-, a di-, and/or a tri-glyceride, or b) a polyoxyalkylene ester of a fatty acid, or c) a combination of b) and any compound from a).
Claim 18
Dependent Claim
45 words
A fibrous composition according to any one of Claim 1 to 16, characterised in that the cellulose fibres are derived from chemical wood pulp, chemically modified thermomechanical wood pulp, thermomechanical wood pulp, mechanical wood pulp, or a mixture of two or more of these pulps.
Claim 19
Dependent Claim
32 words
A fibrous composition according to any of Claims 1 to 17, characterised in that the first synthetic polymeric material consists of a powder and/or fibres having lengths no longer than 1 mm.
Claim 20
Dependent Claim
35 words
A fibrous composition according to any one of Claims 1 to 18, characterised in that it is produced by the wet mixing of the cellulose fibres and the polymeric materials and is in dried-sheet form.
Claim 21
Dependent Claim
30 words
A fibrous composition according to any one of Claims 1 to 18, characterised in that it is produced by the dry mixing of the cellulose fibres and the polymeric materials.
Claim 22
Independent Claim
150 words
A method for the production of an absorbent body for disposable sanitary products, constituted by a fibrous composition according to any one of Claims 1 to 18, characterised by the following steps: - the forming of the fibrous composition into an absorbent body of the desired shape, - the heating of the absorbent body to a temperature at least equal to the melting point of the first polymeric material but below the melting point of the second polymeric material for a period of time such as to melt the first polymeric material and develop bonding points or bridges between at least the synthetic fibres which have not melted, - the cooling of the absorbent body to a temperature such that the first polymeric material resolidifies and the bonding points or bridges bond together at least the synthetic fibres to form a framework constituted by synthetic fibres containing the cellulose fibres.
Claim 23
Dependent Claim
81 words
An absorbent body for disposable sanitary products, consisting of a mixture of fibres of cellulose and of synthetic material, characterised in that the synthetic material consists of at least a first polymeric material and a second polymeric material with a melting point higher than the first, and in that at least the second polymeric material is in the form of fibres which form a framework containing the cellulose fibres held together by means of the fusion of the first polymeric material.
Claim 24
Dependent Claim
81 words
An absorbent body for disposable sanitary products, consisting of a mixture of fibres of cellulose and of synthetic material, characterised in that the synthetic material consists of at least a first polymeric material and a second polymeric material with a melting point higher than the first, and in that at least the second polymeric material is in the form of fibres which form a framework containing the cellulose fibres held together by means of the fusion of the first polymeric material.
Claim 25
Dependent Claim
17 words
An absorbent body according to Claim 22, characterised in that the synthetic material consists of two-component fibres.
Claim 26
Dependent Claim
36 words
An absorbent body according to Claim 22 and Claim 23, characterised in that at least some of the cellulose fibres contained in the framework are bonded to the framework by means of the first polymeric material.
Claim 27
Dependent Claim
17 words
A disposable absorbent article incorporating an absorbent body according to any one of Claims 22 to 24.
References Cited (Backward Citations)
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