Patent EP0390755A2 successfully refreshed from Google Patents.
EP0390755A2
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EP
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Composite layered geotextile having low deformability and high filtering and drainage capability
Assignee: SAVAL Srl
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Filing: 1990-03-27
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Granted: —
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Expires: 2010-03-27
Abstract
Abstract A laminated composite geotextile with a good filtering-drainage capacity and an extensibility of at least 50% less than that of conventional geotextiles or known composites having similar tensile strength is produced by the interconnection of at least one layer which is adapted to afford tensile strength and low deformation and a set of two or more layers having good drainage and/or filtering properties.
Inventors
- 👤 Adrian Costantin Ionescu
- 👤 Carmine Tedesco
- 👤 Mario Castrignano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 23:53
CPC Classifications
E; E01; E01C; E01C3/00; B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B32; B32B; B32B27/00; B32B27/02; B32B27/12; B32B5/00; B32B5/22; B32B5/24; B32B5/26; D; D04; D04H; D04H13/00; D04H5/00; D04H5/02; D04H5/08; D04H5/12; B01D2239/00; B01D2239/06; B01D2239/065; B01D2239/0654; B01D2239/0659; B01D2239/0668; B01D2239/0681; B01D2239/10; B01D2239/12; B01D2239/1291
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
303 words
A laminated composite geotextile formed by a plurality of interconnected layers, characterised in that it includes at least two geotextile layers having filtering and/or drainage characteristics selected from: a1) a conventional woven or non-woven geotextile layer which acts primarily as a filter and is made of synthetic yarns or fibres and has interspace or pore apertures of between 50 and 100 micrometers; a2) a non-woven geotextile layer made of synthetic fibres of a high denier greater than 30 dtex and having pore apertures at least three times larger than those of the aforesaid layer of type a1); and at least one reinforcing layer selected from the group consisting of: b1) - a layer of fabric of synthetic monofilaments and/or parallel and/or twisted multifilaments and/or spun-fibre yarns so as to have substantially balanced tensile strengths less than 125 daN/5cm (strip method) in both production directions and an extensibility of less than 20%; b2) - a layer of fabric of mineral yarns with substantially balanced tensile strengths greater than 200 daN/5cm (strip method) in both production directions and an extensibility of less than 15%; b3) - a layer of net of synthetic or mineral filaments connected by thermal and/or chemical means so as to have substantially balanced tensile strengths greater than 150 daN/5cm (strip method) in both production directions and an extensibility of less than 20%; b4) - a non-woven textile layer of synthetic fibrillated filaments or fibres consolidated by mechanical and/or thermal means, with substantially balanced tensile strength characteristics greater than 80 daN/5cm (strip method) in both production directions and an extensibility of less than 30%; and b5) - a non-woven textile layer of mineral fibres consolidated by thermal and/or chemical means with substantially balanced tensile strengths greater than 100 daN/5cm (strip method) in both production directions and an extensibility of less than 20%.
Claim 2
Dependent Claim
303 words
A laminated composite geotextile formed by a plurality of interconnected layers, characterised in that it includes at least two geotextile layers having filtering and/or drainage characteristics selected from: a1) a conventional woven or non-woven geotextile layer which acts primarily as a filter and is made of synthetic yarns or fibres and has interspace or pore apertures of between 50 and 100 micrometers; a2) a non-woven geotextile layer made of synthetic fibres of a high denier greater than 30 dtex and having pore apertures at least three times larger than those of the aforesaid layer of type a1); and at least one reinforcing layer selected from the group consisting of: b1) - a layer of fabric of synthetic monofilaments and/or parallel and/or twisted multifilaments and/or spun-fibre yarns so as to have substantially balanced tensile strengths less than 125 daN/5cm (strip method) in both production directions and an extensibility of less than 20%; b2) - a layer of fabric of mineral yarns with substantially balanced tensile strengths greater than 200 daN/5cm (strip method) in both production directions and an extensibility of less than 15%; b3) - a layer of net of synthetic or mineral filaments connected by thermal and/or chemical means so as to have substantially balanced tensile strengths greater than 150 daN/5cm (strip method) in both production directions and an extensibility of less than 20%; b4) - a non-woven textile layer of synthetic fibrillated filaments or fibres consolidated by mechanical and/or thermal means, with substantially balanced tensile strength characteristics greater than 80 daN/5cm (strip method) in both production directions and an extensibility of less than 30%; and b5) - a non-woven textile layer of mineral fibres consolidated by thermal and/or chemical means with substantially balanced tensile strengths greater than 100 daN/5cm (strip method) in both production directions and an extensibility of less than 20%.
Claim 3
Dependent Claim
28 words
A composite geotextile according to Claim 1, characterised in that it comprises a pair of layers of type a1) between which a layer of type a2) is interposed.
Claim 4
Dependent Claim
27 words
A composite geotextile according to Claim 1 or Claim 2, characterised in that the reinforcing layer b1)-b5) is interposed between two layers selected from a1) and a2).
Claim 5
Dependent Claim
25 words
A composite geotextile according to any one of Claims 1 to 3, in which the layers constituting the geotextile are interconnected by a raising process.
Claim 6
Dependent Claim
23 words
A composite geotextile according to any one of Claims 1 to 3, in which the layers constituting the geotextile are interconnected by stitching.
Claim 7
Dependent Claim
97 words
A composite geotextile according to any one of Claims 1 to 3, characterised in that at least one of the layers of type a) includes from 10 to 20% of fibres or yarns of a polymer with a melting point at least 50C° below the melting point of the rest of the fibres or yarns constituting the layer, the layers constituting the composite geotextile being interconnected by heat-sealing by the feeding of the pile of layers to a heat-sealing plant with rollers heated to a temperature such as to melt the polymer with the lower melting point.
Claim 8
Dependent Claim
57 words
A composite geotextile according to any one of Claims 1 to 3, characterised in that the layers are interconnected by heat-sealing as a result of the melting of an auxiliary layer of synthetic material having a melting point at least 50C° below the lowest melting point of the fibres or yarns constituting the layers a) and b).
Claim 9
Dependent Claim
24 words
A composite geotextile according to any one of Claims 1 to 3, in which the layers are interconnected by an application of adhesive resin.
References Cited (Backward Citations)
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