US3835754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for creating lines of weakness in thread-reinforced structures
Assignee: Kimberly Clark Tissue Co
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Filing: 1972-12-29
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Granted: 1974-09-17
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Expires: 1992-12-29
Abstract
Abstract A laminated structure comprising at least one ply of cellulosic wadding with reinforcing threads secured thereto has a plurality of spaced lines of perforations separating discrete sheets of the laminated structure. Each line of perforations is defined by a series of spaced, discrete cuts spaced apart by uncut regions. The tensile strength of segments of reinforcing threads disposed in the uncut regions is substantially lower than the tensile strength of segments of reinforcing threads disposed outside of the uncut regions to thereby define lines of weakness along the lines of perforations. Method and apparatus for creating the above-described lines of weakness in the laminated structure by applying a crushing force in at least uncut regions to substantially weaken the segments of reinforcing threads disposed in the uncut regions.
Inventors
- 👤 R Lewyckyj
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:38
CPC Classifications
A; A41; A41D; A41D31/00; A41D31/02; A61; A61F; A61F13/00; A61F13/00987; A61F13/00991; A61F13/00995; B; B26; B26F; B26F1/00; B26F1/18; B32; B32B; B32B38/00; B32B38/0004; B32B5/00; B32B5/02; B32B5/22; B32B5/24; B32B5/26; B32B38/04; B32B2038/047; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2262/0276; B32B2262/04; B32B2262/06; B32B2262/062; B32B2262/10; B32B2262/101; B32B2307/00; B32B2307/50; B32B2307/54; B32B2432/00; Y; Y10; Y10S; Y10S428/00; Y10S428/906; Y10S493/00; Y10S493/963; Y10T; Y10T428/00; Y10T428/15; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T428/24107; Y10T428/24355; Y10T428/24471; Y10T428/24479; Y10T428/2457; Y10T428/24595; Y10T83/00; Y10T83/02; Y10T83/0207; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/4847; Y10T83/929; Y10T83/9372; Y10T83/9408; Y10T83/9411; Y10T83/9449
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
158 words
A method for creating at least one line of weakness in a laminated structure having reinforcing threads secured to a substrate layer, said lines of weakness each including a discontinuous cut line extending through the laminated structure and spaced regions between the cuts in which the substrate layer is uncut, said reinforcing threads crossing said lines of weakness and having a tensile strength which is substantially reduced by crushing forces of a magnitude which leaves substantially unreduced the tensile strength of the substrate layer, said method including the following sequential steps: A. applying a crushing force to said laminated structure in at lease regions corresponding to the spaced regions of a line of weakness and of a magnitude for substantially reducing the tensile strength of the reinforcing threads disposed in said spaced regions without substantially reducing the tensile strength of said substrate layer; and B. cutting said laminated structure at spaced intervals to form said discontinuous cut line.
Claim 2
Independent Claim
158 words
A method for creating at least one line of weakness in a laminated structure having reinforcing threads secured to a substrate layer, said lines of weakness each including a discontinuous cut line extending through the laminated structure and spaced regions between the cuts in which the substrate layer is uncut, said reinforcing threads crossing said lines of weakness and having a tensile strength which is substantially reduced by crushing forces of a magnitude which leaves substantially unreduced the tensile strength of the substrate layer, said method including the following sequential steps: A. applying a crushing force to said laminated structure in at lease regions corresponding to the spaced regions of a line of weakness and of a magnitude for substantially reducing the tensile strength of the reinforcing threads disposed in said spaced regions without substantially reducing the tensile strength of said substrate layer; and B. cutting said laminated structure at spaced intervals to form said discontinuous cut line.
Claim 3
Dependent Claim
29 words
A method according to claim 1, wherein the crushing force is of a magnitude for substantially destroying the tensile strength of the reinforcing threads disposed in said uncut regions.
Claim 4
Dependent Claim
20 words
The method according to claim 1, wherein the substrate layer is comprised of at least one ply of cellulosic wadding.
Claim 5
Dependent Claim
27 words
The method according to claim 1, wherein said laminated structure is crushed in a continuous compressed region whereby all reinforcing threads in said compressed region are crushed.
Claim 6
Dependent Claim
51 words
The method according to claim 1, wherein said laminated structure is crushed in spaced, narrow regions which are substantially parallel to each other and which are disposed at an acute angle to the direction of the discontinuous cut line for assuring that all reinforcing threads in said uncut regions are crushed.
Claim 7
Dependent Claim
30 words
The method according to claim 5, wherein said laminated structure is crushed such that portions of adjacent, narrow regions overlap each other in a perpendicular direction to said discontinuous line.
Claim 8
Independent Claim
145 words
A method for creating at least one line of weakness in a laminated structure having reinforcing threads disposed between substrate layers, and lines of weakness each including a discontinuous cut line extending through the laminated structure and spaced regions between cuts in which said substrate layers are uncut, said reinforcing threads crossing said lines of weakness and having a tensile strength which is substantially reduced by crushing forces, said method including the following steps performed in either order or simultaneously: A. applying a crushing force to said laminated structure in at least regions corresponding to the spaced regions of a line of weakness without cutting said substrate layers, said crushing force being of a magnitude for reducing the tensile strength of the reinforcing threads disposed in said spaced regions; and B. cutting through said laminated structure at spaced intervals to form said discontinuous cut line.
Claim 9
Independent Claim
145 words
A method for creating at least one line of weakness in a laminated structure having reinforcing threads disposed between substrate layers, and lines of weakness each including a discontinuous cut line extending through the laminated structure and spaced regions between cuts in which said substrate layers are uncut, said reinforcing threads crossing said lines of weakness and having a tensile strength which is substantially reduced by crushing forces, said method including the following steps performed in either order or simultaneously: A. applying a crushing force to said laminated structure in at least regions corresponding to the spaced regions of a line of weakness without cutting said substrate layers, said crushing force being of a magnitude for reducing the tensile strength of the reinforcing threads disposed in said spaced regions; and B. cutting through said laminated structure at spaced intervals to form said discontinuous cut line.
Claim 10
Dependent Claim
29 words
The method according to claim 7 wherein the crushing force is of a magnitude for substantially destroying the tensile strength of the reinforcing threads disposed in said uncut regions.
Claim 11
Dependent Claim
32 words
The method according to claim 7, wherein said laminated structure is crushed in a continuous compressed region extending between said spaced marginal edges for crushing all reinforcing threads in said compressed region.
Claim 12
Dependent Claim
45 words
The method according to claim 7, wherein said laminated structure is crushed in spaced, narrow regions which are substantially parallel to each other and disposed at an acute angle to the discontinuous cut line for assuring that all reinforcing threads in uncut regions are crushed.
Claim 13
Dependent Claim
30 words
The method according to claim 10, wherein said laminated structure is crushed such that portions of adjacEnt narrow regions overlap each other in a perpendicular direction to said discontinuous line.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |