US4000237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a soft, absorbent, unitary, laminate-like fibrous web with delaminating strength
Assignee: Kimberly Clark Tissue Co
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Filing: 1975-06-04
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Granted: 1976-12-28
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Expires: 1995-06-04
Abstract
Abstract The method of the invention consists of forming a web of substantially planar-aligned fibers, applying a surface disposition of bonding material to one side of the web to penetrate only part way through the web in order to form a first surface region having the surface bonding material and a central core region free from the surface bonding material and bounded on the side opposite the first surface region by a second surface region, applying a penetrating disposition of bonding material to one side of the web in a fine, spaced-apart pattern which occupies less area in the plane of the web than the surface bonding material in the first surface region and penetrates through the central core region to connect the first and second surface regions together, and creping the web to decrease the fiber concentration in the central core region to less than that in the first surface region. In a preferred method, a surface disposition of bonding material is also applied to the second surface region, and the surface bonding material applied to the first surface region is in a fine, spaced-apart pattern and is used to adhere the bonded portions of the first surface region of the web to a creping surface in order to finely crepe those portions of the web upon creping the web from the creping surface.
Inventors
- 👤 Clifford J. Roberts, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
D; D21; D21H; D21H27/00; D21H27/02; B; B31; B31F; B31F1/00; B31F1/12; B31F1/126; D21F; D21F11/00; D21F11/14; D21H17/00; D21H17/20; D21H17/33; D21H21/00; D21H21/14; D21H21/18; D21H21/22; D21H23/00; D21H23/02; D21H23/22; D21H23/50; D21H23/52; D21H23/56; D21H23/58
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
209 words
Method of forming an integral laminate-like fibrous sheet material, comprising the steps of: a. forming a web of substantially planar-aligned fibers; b. applying bonding material to one side of the web to penetrate only partway through the thickness of the web to create in the web a first surface region having the bonding material disposed within and a central core region free of the partway penetrating bonding material, the central core region being bounded on one side by the first surface region and on the other side by a second surface region; c. applying bonding material in a spaced-apart pattern to one side of the web to penetrate through the central core region and to connect the first and second surface regions together, the spaced-apart pattern of bonding material occupying less area in the plane of the web than the partway penetrating bonding material, wherein steps (b) and (c) are performed simultaneously by applying the bonding material from a rotogravure roll having cells for containing the fully penetrating bonding material which are deeper than the cells containing the partway penetrating bonding material; and d. adhering the first surface of the web to a creping surface with the partway penetrating bonding material and creping the web from the creping surface.
Claim 2
Dependent Claim
209 words
Method of forming an integral laminate-like fibrous sheet material, comprising the steps of: a. forming a web of substantially planar-aligned fibers; b. applying bonding material to one side of the web to penetrate only partway through the thickness of the web to create in the web a first surface region having the bonding material disposed within and a central core region free of the partway penetrating bonding material, the central core region being bounded on one side by the first surface region and on the other side by a second surface region; c. applying bonding material in a spaced-apart pattern to one side of the web to penetrate through the central core region and to connect the first and second surface regions together, the spaced-apart pattern of bonding material occupying less area in the plane of the web than the partway penetrating bonding material, wherein steps (b) and (c) are performed simultaneously by applying the bonding material from a rotogravure roll having cells for containing the fully penetrating bonding material which are deeper than the cells containing the partway penetrating bonding material; and d. adhering the first surface of the web to a creping surface with the partway penetrating bonding material and creping the web from the creping surface.
Claim 3
Independent Claim
216 words
A method of forming an integral laminate-like fibrous sheet material, comprising the steps of: a. forming a web of substantially planar-aligned fibers; b. applying bonding material to one side of the web to penetrate only partway through the thickness of the web to create in the web a first surface region having the partway penetrating bonding material disposed within and a central core region free of the partway penetrating bonding material, the central core region being bounded on one side by the first surface region and on the other side by a second surface region; c. applying bonding material in a spaced-apart pattern to one side of the web to penetrate through the central core region and to connect the first and second surface regions together, the spaced-apart pattern of bonding material occupying less area in the plane of the web than the partway penetrating bonding material; d. adhering the first surface of the web to a creping surface with the partway penetrating bonding material and creping the web from the creping surface; and e. applying bonding material to the second surface region of the web to penetrate only through the second surface region and to occupy an area in the plane of the web greater than the area occupied by the fully penetrating bonding material.
Claim 4
Independent Claim
216 words
A method of forming an integral laminate-like fibrous sheet material, comprising the steps of: a. forming a web of substantially planar-aligned fibers; b. applying bonding material to one side of the web to penetrate only partway through the thickness of the web to create in the web a first surface region having the partway penetrating bonding material disposed within and a central core region free of the partway penetrating bonding material, the central core region being bounded on one side by the first surface region and on the other side by a second surface region; c. applying bonding material in a spaced-apart pattern to one side of the web to penetrate through the central core region and to connect the first and second surface regions together, the spaced-apart pattern of bonding material occupying less area in the plane of the web than the partway penetrating bonding material; d. adhering the first surface of the web to a creping surface with the partway penetrating bonding material and creping the web from the creping surface; and e. applying bonding material to the second surface region of the web to penetrate only through the second surface region and to occupy an area in the plane of the web greater than the area occupied by the fully penetrating bonding material.
Claim 5
Dependent Claim
117 words
A method recited in claim 1, wherein the web is formed from randomly oriented fibers having a predominant length of less than 1/4 inch to have a basis weight of from about 12 to about 80 pounds per 2880 square feet, the bonding material in the first surface region is applied in a fine, spaced-apart pattern occupying from about 15 to about 60% of the surface area of the finished web in the first surface region and penetrating through a depth of from about 10 to about 60% of the finished web thickness, and the fully penetrating bonding material occupies an area in the plane of the web of less than about 10% of the web area.
Claim 6
Dependent Claim
81 words
The method are recited in claim 2, wherein the bonding material in the first and second surface regions are disposed in a fine, spaced-apart pattern occupying from about 15 to about 60% of the surface area of the finished web in their respective surface regions and penetrating from about 10 to about 40% of the finished web thickness, and the fully penetrating bonding material occupies from about 0.05 to about 2% of the area in the plane of the finished web.
Claim 7
Dependent Claim
39 words
The method as recited in claim 4, including the steps of: f. adhering the web, by use of the bonding material in the second surface region, to a creping surface, and g. creping the web from the creping surface.
Claim 8
Dependent Claim
67 words
The method recited in claim 5, wherein the web is formed under conditions resulting in very low interfiber bonding strength, the bonding materials are characterized as elastomeric materials, and the bonding material in the second surface region is arranged to uniformly space groups of bonding material in that pattern apart from each other from about 1/8 inch to about 2 inches across the plane of the web.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |