Patent US4216048A successfully refreshed from Google Patents.
US4216048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separating laminated layers
Assignee: Brady Corp
•
Filing: 1977-11-16
•
Granted: 1980-08-05
•
Expires: 1997-11-16
Abstract
Abstract Laminate layers, such as a label and its liner, are separated by directing both layers at an end of the laminate around a sharp bend to cause shearing and lengthwise offset between the layers, and then releasing the end, the overall orientation being such that, upon release of the end, a differential in the forces that tend to straighten the layers drives apart the shear-weakened adhesive bond. The bending is carried out by sliding the end around a sharply curved surface.
Inventors
- 👤 Edward C. Gehweiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:08
CPC Classifications
B; B65; B65C; B65C9/00; B65C9/0006; B29; B29C; B29C63/00; B29C63/0004; B29C63/0013; Y; Y10; Y10T; Y10T156/00; Y10T156/11; Y10T156/1168; Y10T156/19; Y10T156/1978; Y10T156/1989
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
162 words
A method of separating coterminous layers of a laminate at an end thereof, said layers comprising a flexible layer and a liner with an adhesive bond therebetween, said method comprising sliding said end around a sharply curved concave surface to bend both said layers sharply in the same direction at said end to cause shearing and lengthwise offset therebetween to weaken said bond, all of said sliding being end-first in the direction away from said laminate along said concave surface, said bending being carried out by forces applied to one said layer by its sliding contact with said concave surface and without direct guiding of the other said layer at said end, and then, without allowing said bond to re-form, releasing said end to permit both said layers to spring back from said bending, the overall orientation being such that, upon release of said end, a differential in the forces that tend to straighten the layers drives apart the shear-weakened adhesive bond.
Claim 2
Independent Claim
162 words
A method of separating coterminous layers of a laminate at an end thereof, said layers comprising a flexible layer and a liner with an adhesive bond therebetween, said method comprising sliding said end around a sharply curved concave surface to bend both said layers sharply in the same direction at said end to cause shearing and lengthwise offset therebetween to weaken said bond, all of said sliding being end-first in the direction away from said laminate along said concave surface, said bending being carried out by forces applied to one said layer by its sliding contact with said concave surface and without direct guiding of the other said layer at said end, and then, without allowing said bond to re-form, releasing said end to permit both said layers to spring back from said bending, the overall orientation being such that, upon release of said end, a differential in the forces that tend to straighten the layers drives apart the shear-weakened adhesive bond.
Claim 3
Dependent Claim
17 words
A method as claimed in claim 1 wherein said sliding step comprises sliding said end corner first.
Claim 4
Dependent Claim
50 words
A method of separating layers of a laminate as claimed in claim 1, comprising advancing said laminate corner first against a flat surface and at an angle thereto to cause said flat surface to initiate said bending, and then advancing said laminate along said curved surface to complete said bending.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |