Patent US5409359A successfully refreshed from Google Patents.
EP0337597A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in and relating to heat shrinkable fibres and products therefrom
Assignee: Albany International Corp
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Filing: 1989-02-22
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Granted: —
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Expires: 2009-02-22
Abstract
Abstract This invention relates to a composition of matter having a fibre structure incorporating a major proportion of heat shrinkable fibres, the structure includes within it discreet fibre groupings which serve to provide structural elements within the composition. The composition of the invention is capable of being formed to provide shaped products. A particular aspect of the invention relates to compositions comprising flame retardent fibres typically polyimide fibres which enables the production of flame retardent compositions. The density of the structures can be controlled as can the rigidity thereof.
Inventors
- 👤 Frederick S. Campbell
- 👤 Gordon J. Varney
- 👤 Dewitt R. Petterson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 16:25
CPC Classifications
D; D01; D01D; D01D10/00; D04; D04H; D04H1/00; D04H1/04; D04H1/06; B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B5/02; B32B5/022; D04H1/40; D04H1/44; D04H1/46; D04H1/48; D04H1/482; D04H1/54; D04H1/58; D04H1/593; B32B2262/00; B32B2262/02; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
41 words
A composition of matter comprising a fibre structure at least a major proportion of which comprises heat shrinkable fibres, which structure has been heat treated to produce fibre to fibre bonding at least some of the fibre to fibre contact points.
Claim 2
Dependent Claim
41 words
A composition of matter comprising a fibre structure at least a major proportion of which comprises heat shrinkable fibres, which structure has been heat treated to produce fibre to fibre bonding at least some of the fibre to fibre contact points.
Claim 3
Dependent Claim
28 words
A composition of matter comprising a fibre structure, a major proportion of which comprises heat shrinkable fibres which have been heat treated to produce densification of the structure.
Claim 4
Dependent Claim
28 words
A composition of matter comprising a fibre structure, a major proportion of which comprises heat shrinkable fibres which have been heat treated to produce densification of the structure.
Claim 5
Dependent Claim
54 words
A composition of matter comprising a fibre structure including a major proportion of heat shrinkable fibres, said structure including discrete fibre groups, said structure being capable of heat treatment to produce a structure of increased density in which the density of said fibre groups is greater than that of the remainder of the structure.
Claim 6
Dependent Claim
54 words
A composition of matter comprising a fibre structure including a major proportion of heat shrinkable fibres, said structure including discrete fibre groups, said structure being capable of heat treatment to produce a structure of increased density in which the density of said fibre groups is greater than that of the remainder of the structure.
Claim 7
Dependent Claim
78 words
A composition of matter in the form of a shaped article produced by a method which comprises forming a fibre structure comprising a heat shrinkable fibre, locating said structure contiguous a shaping surface, constraining said structure against shrinkage in at least one direction, subjecting said material to heat at a temperature and for a time sufficient to obtain fibre to fibre bonding to increase the rigidity of the structure, and thereafter removing said shaped article from said surface.
Claim 8
Dependent Claim
78 words
A composition of matter in the form of a shaped article produced by a method which comprises forming a fibre structure comprising a heat shrinkable fibre, locating said structure contiguous a shaping surface, constraining said structure against shrinkage in at least one direction, subjecting said material to heat at a temperature and for a time sufficient to obtain fibre to fibre bonding to increase the rigidity of the structure, and thereafter removing said shaped article from said surface.
Claim 9
Dependent Claim
19 words
A composition as claimed in any preceding claim wherein the density of the structure after heat treatment is non-uniform.
Claim 10
Dependent Claim
35 words
A composition as claimed in any preceding claim wherein the structure has a plurality of longitudinal elements therein, each element comprising a group of said fibres oriented in a plane and densified by heat treatment.
Claim 11
Dependent Claim
28 words
A composition as claimed in any preceding claim wherein the fibre structure comprises a layer having a plurality of longitudinal elements extending transverse the plane of said layer.
Claim 12
Dependent Claim
29 words
A composition as claimed in any preceding claim wherein the fibre structure is selected from one or more of a non-woven felt, a knitted material and a woven material.
Claim 13
Dependent Claim
22 words
A composition as claimed in claim 8 wherein the felt structure is a batt comprising a series of layers of separated fibres.
Claim 14
Dependent Claim
23 words
A composition as claimed in any preceding claim wherein the fibre structure layer is formed by several layers of fibre material laminated together.
Claim 15
Dependent Claim
29 words
A composition as claimed in claim 10 characterised in that lamination adhesives are employed selected from acrylic adhesives, polyester adhesives, polyamide adhesives, polyolefin adhesives, polyurethane adhesives and polyimide adhesives.
Claim 16
Dependent Claim
36 words
A composition as claimed in any one of claims 3 to 11 wherein the groups of fibres are formed transverse to the plane of the fibre structure and felts are formed by needling or by hydro-entangling.
Claim 17
Dependent Claim
20 words
A composition as claimed in any preceding claim wherein the density is within the range of 0.005 to 1.2 gm/cc.
Claim 18
Dependent Claim
28 words
A composition as claimed in any preceding claim characterised in that the fibre structure is a felt layer in which fibre lengths are oriented within the felt layer.
Claim 19
Dependent Claim
37 words
A composition as claimed in claim 14 wherein the oriented fibres are disposed in discrete laminae within each layer, said laminae being arranged such that the orientation direction of adjacent laminae defines an angle greater than 5°.
Claim 20
Dependent Claim
31 words
A composition as claimed in any preceding claim wherein said material is subjected to heat at a temperature and for a time sufficient to shrink the fibre to obtain fibre-to-fibre bonding.
Claim 21
Dependent Claim
46 words
A composition as claimed in any preceding claim wherein the fibres constituting said major portion of the fibres of the fibre structure are heat shrinkable fibres selected from polyamide fibres, acrylic fibres, polypropylene fibres, polyphenylene sulphide fibres, polyimide fibres, aromatic ether ketone fibres and polyetherimide fibres.
Claim 22
Dependent Claim
35 words
A composition as claimed in any preceding claim characterised in that the individual fibres of the fibre structure include a proportion of not more than 5% by weight of a plasticising low molecular weight material.
Claim 23
Dependent Claim
32 words
A composition as claimed in claim 18 wherein said low molecular weight plasticising material is selected from solvents for the fibre polymer and low molecular weight oligomers of the same polymer material.
Claim 24
Dependent Claim
35 words
A composition as claimed in claim 18 or claim 19 wherein the fibres are polyimide fibres and the solvent is one or more of consisting of dimethyl formamide, N-methyl pyrrolidone, N-vinyl pyrrolidone and dimethyl acetamide.
Claim 25
Dependent Claim
54 words
A composition as claimed in any preceding claim wherein the structure is heated to a temperature sufficient to allow densification to occur whilst constrained against shrinkage in at least one direction, locating said structure contiguous a shaping surface while maintaining said constraint, continuing to constrain said structure during cooling and thereafter removing said constraint.
Claim 26
Dependent Claim
37 words
A composition as claimed in any one of claims 4 to 21 wherein characterised in that the fibre structure is constrained in at least two dimensions against shrinkage thereby allowing shrinkage substantially only in the third dimension.
Claim 27
Dependent Claim
27 words
A composition as claimed in any preceding claim characterised in that the heating is to a temperature in excess of the glass transition temperature of the fibres.
Claim 28
Dependent Claim
23 words
A composition as claimed in any preceding claims wherein the fibre structure comprises yarns or fibres selected from continuous filaments and staple fibre.
Claim 29
Dependent Claim
31 words
A composition as claimed in any one of claims 4 to 23 wherein the shaping surface comprises at least two cooperating surfaces which cooperation to produce a three dimensional contoured panel.
Claim 30
Dependent Claim
25 words
A composition as claimed in any one of claims 7 to 25 wherein said transverse direction is substantially normal to the plane of the layer.
Claim 31
Dependent Claim
72 words
A composition as claimed in any preceding claim wherein the fibre structure is a laminated assembly formed from several layers of rigidified non-woven material, said structure having groups of fibres extending in a direction transverse to each layer and wherein said structure is shaped to allow said groups of densified fibres to form a structural component within each layer per se to impart a degree of structural rigidity to the resultant laminate.
Claim 32
Dependent Claim
27 words
A composition as claimed in anyone of claims 4 to 27 wherein the densification of the transversely disposed fibre groups is accompanied by fibre to fibre bonding.
Claim 33
Dependent Claim
30 words
A composition as claimed in any preceding claim wherein the fibres of the fibre structure have been subjected to a draw ratio in forming of between 2 and 7 times.
Claim 34
Dependent Claim
39 words
A composition as claimed in any preceding claim wherein the fibres are capable of an inherent shrinkage of at least 15 to 80% on heating in order to provide the appropriate shrinkage and densification of the cohesive fibre assembly.
Claim 35
Dependent Claim
30 words
A composition as claimed in any preceding claim wherein the fibre structure comprises a major proportion of polyimide fibres based on structural units of the general formula and/or the group
Claim 36
Independent Claim
71 words
A method of producing a composition as claimed in any preceding claim which method comprises forming a fibre structure comprising a heat shrinkable fibre, heating said structure to a temperature sufficient to allow densification to occur while constraining said structure against shrinkage in at least one direction, locating said densified structure contiguous a shaping surface while maintaining said constraint, cooling said structure while maintaining said constraint, and thereafter removing said constraint.
References Cited (Backward Citations)
No citation records indexed.
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