US3607348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twice-coated cellulosic-fiber structure and its manufacture
Assignee: Little Rapids Pulp Co
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Filing: 1968-05-14
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Granted: 1971-09-21
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Expires: 1988-05-14
Abstract
Abstract A sheet product comprised of a substrate of nonwoven cellulosic fibers (which substrate either has a substantial porosity or is water-sensitive), a discontinuous prime coating of hydrophobic material adhering to the cellulosic fibers, and a second material filling surface interstices, and process for making same.
Inventors
- 👤 Joseph A Wray
- 👤 Herbert N Johnston
- 👤 Robert L Leaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:10
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/10; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24934; Y10T428/249921; Y10T428/249953; Y10T428/249962; Y10T428/249964; Y10T428/249965; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
25 words
A paper product accordinG to claim 1 wherein said hydrophobic material is sufficiently discontinuous so as not to substantially alter the porosity of said sheet.
Claim 2
Dependent Claim
21 words
A paper product according to claim 1 wherein said second coating is selectively deposited in the discontinuities of said first coating.
Claim 3
Dependent Claim
87 words
A paper product comprising: a sheet of nonwoven cellulosic fibers interlaced to form a network of interstices, said sheet having substantial porosity indicated by an air permeability of at least about 300 ml./min. in the uncoated state: a first discontinuous surface coating of hydrophobic, thermoplastic material adhering to said fibers; and a second, discontinuous, hydrophilic coating on said thermoplastic coated sheet substantially filling surface interstices therein and reducing the porosity of said sheet to a level indicated by an air permeability of less than about 50 ml./min.
Claim 4
Dependent Claim
25 words
A paper product according to claim 4 wherein said thermoplastic material is sufficiently discontinuous so as not to substantially alter the porosity of said sheet.
Claim 5
Dependent Claim
24 words
A paper product according to claim 4 wherein said first coating has a weight of from about 0.4 to about 2.0 pounds per ream.
Claim 6
Dependent Claim
25 words
A paper product according to claim 4 wherein said second coating has a dry weight of from about 0.1 to about 1.5 pounds per ream.
Claim 7
Dependent Claim
13 words
A paper product according to claim 4 wherein said sheet is tissue paper.
Claim 8
Dependent Claim
47 words
A paper product according to claim 4 wherein said first coating consists essentially of a material selected from the class consisting of paraffin and microcrystalline waxes and wherein the second coating consists essentially of a substance selected from the class consisting of acetylated starch and hydrophilic clay.
Claim 9
Independent Claim
89 words
The method of twice-coating a porous sheet of nonwoven cellulosic fibers which comprises the steps of: applying a first discontinuous coating of hydrophobic, thermosplastic material to a surface of said sheet; wherein the open regions of said discontinuous hydrophobic coating constitute at least about 10 percent and no more than about 70 percent of the gross surface area of said sheet and subsequently applying hydrophilic material to said once-coated surface, said hydrophilic material including a second coating substance forming a discontinuous coating substantially filling discontinuities in the hydrophobic coating.
Claim 10
Dependent Claim
16 words
The method according to claim 10 wherein said hydrophobic material is applied in the molten state.
Claim 11
Dependent Claim
38 words
A method according to claim 10 wherein a molten discontinous pattern of said hydrophobic material is applied directly onto the surface of said sheet and subsequently contacted with a hot smoothing means before application of said hydrophilic material.
Claim 12
Dependent Claim
15 words
A method according to claim 12 wherein said pattern is established by an engraved device.
Claim 13
Dependent Claim
112 words
In the process of coating a porous nonwoven substrate composed of natural cellulosic fibers with ink which upon application to the untreated porous substrate penetrates and bleeds therethrough, the combination of steps of: A pretreating the porous nonwoven substrate to provide a twice-coated substrate by i. firstly applying to a surface of said substrate a hydrophobic, thermoplastic coating composition as a discontinuous coating thereon, ii. and secondly applying a hydrophilic coating composition as a discontinuous coating onto the substrate''s surface bearing the discontinuous coating of the hydrophobic, thermoplastic coating composition so as to substantially fill discontinuities thereof and provide said twice-coated substrate; b. and then coating said twice-coated substrate with said ink.
References Cited (Backward Citations)
US1966747A
Cited
US2407549A
Cited
US2470493A
Cited
US2962385A
Cited
US2955970A
Cited
US2970932A
Cited
US3196031A
Cited
US3257226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |