Patent US5340551A successfully refreshed from Google Patents.
Patent US4005169A successfully refreshed from Google Patents.
US4005169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-woven fabrics
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1975-04-17
•
Granted: 1977-01-25
•
Expires: 1995-04-17
Abstract
Abstract A method for making a segmentally thermally bonded non woven fabric by compressing a fibrous web between heated members with different surface land patterns of isolated projections which overlap with each other to different extents in defined manner so that registration problems are avoided in manufacture and a complex surface texture is produced in the fabric.
Inventors
- 👤 David Charles Cumbers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:18
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/44; D04H1/46; D04H1/48; D04H1/485; D04H1/541; D04H1/542; D04H1/549; D04H1/55; D04H1/70; D04H1/74
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
150 words
In a method of making a thermally segmentally bonded non woven fabric comprising compressing a fibrous web containing distributed thermally bondable material between two members whose opposed co-operating surfaces each have different surface land patterns heated sufficiently to activate the thermally bondable material in contact with them, the improvement comprising using regular patterns of lands which are isolated discontinuous projections spaced-apart on all sides from adjacent projections opposed pairs of lands, one on each member, differing from at least some other such pairs in their degrees of relative register in two directions at right angles the differences in register between different opposed pairs of lands ranging in each direction from zero to half of the corresponding interland spacings whereby uncontrolled variations in register between the members as a whole cause no visible difference in the segmental bond pattern in the resultant fabric and no intermeshing can occur between the members.
Claim 2
Dependent Claim
150 words
In a method of making a thermally segmentally bonded non woven fabric comprising compressing a fibrous web containing distributed thermally bondable material between two members whose opposed co-operating surfaces each have different surface land patterns heated sufficiently to activate the thermally bondable material in contact with them, the improvement comprising using regular patterns of lands which are isolated discontinuous projections spaced-apart on all sides from adjacent projections opposed pairs of lands, one on each member, differing from at least some other such pairs in their degrees of relative register in two directions at right angles the differences in register between different opposed pairs of lands ranging in each direction from zero to half of the corresponding interland spacings whereby uncontrolled variations in register between the members as a whole cause no visible difference in the segmental bond pattern in the resultant fabric and no intermeshing can occur between the members.
Claim 3
Dependent Claim
12 words
A method according to claim 1 in which the members are rolls.
Claim 4
Dependent Claim
56 words
A method according to claim 2 in which the lands on both rolls form rows in close or overlapping echelon inclined to the direction of the nip between the rolls whereby as the rolls rotate there are always some pairs of lands in face to face contact in the nip serving to withstand the nip pressure.
Claim 5
Dependent Claim
34 words
A method according to claim 1 in which the product of the aggregate land areas of each of the two members expressed as a percentage of their total areas is between 2% and 20%.
Claim 6
Dependent Claim
19 words
A method according to claim 4 in which the product of the land areas is between 5% and 12%.
Claim 7
Dependent Claim
23 words
A method according to claim 1 in which the ratio of the aggregate land areas of the two members is less than 5:1.
Claim 8
Dependent Claim
17 words
A method according to claim 1 in which the distributed thermally bondable material is present as fibres.
Claim 9
Dependent Claim
31 words
A method according to claim 7 in which the web comprises thermally bondable fibres and also fibres which do not soften at the temperature used to activate the thermally bondable fibres.
Claim 10
Dependent Claim
36 words
A method according to claim 7 in which the distributed thermally bondable material is present as the sheaths of bicomponent fibres which have cores which do not soften at the temperature used to activate their sheaths.
Claim 11
Dependent Claim
27 words
A method according to claim 9 in which the web comprises also fibres which do not soften at the temperature used to activate the bondable bicomponent fibres.
Claim 12
Dependent Claim
23 words
A method according to claim 1 in which at least a substantial proportion of the fibres used to form the web is uncrimped.
Claim 13
Dependent Claim
22 words
A method according to claim 1 in which the fibres used to form the web have less than 2 crimps per centimetre.
Claim 14
Dependent Claim
94 words
A method according to claim 1 in which the product of the aggregate land areas of the two members expressed as percentages of their total areas is between 2% and 20% and in which the ratio of the aggregate land areas of the two members is less than 5:1, and in which the distributed thermally bondable material is present as the sheaths of bicomponent fibres which have cores which do not soften at the bonding temperature and in which at least a substantial proportion of the fibres used to form the web is uncrimped.
Claim 15
Dependent Claim
94 words
A method according to claim 1 in which the product of the aggregate land areas of the two members expressed as percentages of their total areas is between 2% and 20 % and in which the ratio of the aggregate land areas of the two members is less than 5:1, and in which the distributed thermally bondable material is present as the sheaths of bicomponent fibres which have cores which do not soften at the bonding temperature and in which the fibres used to form the web have less than 2 crimps per centimeter.
References Cited (Backward Citations)
US3120449A
Cited
US3255064A
Cited
US3272898A
Cited
US3507943A
Cited
US3692622A
Cited
US3607992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |