US3827281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet material and knife edge abrasive test
Assignee: Domtar Inc
•
Filing: 1972-07-31
•
Granted: 1974-08-06
•
Expires: 1992-07-31
Abstract
Abstract A method and apparatus for testing the abrasiveness of materials such as paper, textiles, or the like, by pressing a sharp but relatively easily dulled cutting edge through a plurality of layers of paper and registering the force necessary to move the knife edge through the layers relative to the depth of cut thereby to obtain an indication of the rate of dulling of the knife and thus the abrasion characteristics of the paper.
Inventors
- 👤 R Hamel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:04
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/58
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
A method of testing the abrasion characteristics of sheet material comprising forming a book of a plurality of layers of said sheet material, positioning said book relative to a cutting edge that is more easily dulled than cutting edges normally used commercially to cut said material, applying forces to move said cutting edge through a plurality of said layers at a substantially constant speed, recording the change in said forces required to maintain said constant speed after a selected period of time as said edge penetrates through said layers thereby to obtain an indication of the rate of dulling of said edge and an indication of the abrasion characteristics of the material.
Claim 2
Independent Claim
112 words
A method of testing the abrasion characteristics of sheet material comprising forming a book of a plurality of layers of said sheet material, positioning said book relative to a cutting edge that is more easily dulled than cutting edges normally used commercially to cut said material, applying forces to move said cutting edge through a plurality of said layers at a substantially constant speed, recording the change in said forces required to maintain said constant speed after a selected period of time as said edge penetrates through said layers thereby to obtain an indication of the rate of dulling of said edge and an indication of the abrasion characteristics of the material.
Claim 3
Dependent Claim
31 words
A method as defined in claim 1 wherein said cutting edge is moved in a direction substantially perpendicular to said book whereby said edge cuts successively through said plurality of layers.
Claim 4
Dependent Claim
12 words
A method as defined in claim 2 wherein said material is paper.
Claim 5
Dependent Claim
24 words
A method as defined in claim 2, wherein said cutting edge is moved in said direction for a distance of at least 3 inches.
Claim 6
Dependent Claim
34 words
A method as defined in claim 2, wherein said edge severs completely across said book thereby to separate a portion of each layer from said book as each layer is severed by said edge.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |