US4087506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a fluid absorbent web
Assignee: Parke Davis and Co LLC
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Filing: 1976-08-05
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Granted: 1978-05-02
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Expires: 1996-08-05
Abstract
Abstract A method of producing a fluid absorbent web for the manufacture of disposable absorbent articles is provided, such as diapers, underpads, sanitary napkins or similar articles. The method includes the step of forming a uniform moving web of fiberized wood pulp having a central zone, applying hydrocolloid polymer particles onto the surface of the central zone, and distributing the applied particles into the body of the moving web by air pressure means. Apparatus for producing such articles is also provided featuring means for incorporating absorbent polymer particles within a central zone of a moving web of the matrix.
Inventors
- 👤 Roy Gordon Cook
- 👤 James Patrick Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:00
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/15577; A61F13/15617; A61F13/1565
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
174 words
A method of producing a fluid absorbent web for the manufacture of disposable absorbent articles such as diapers, underpads and sanitary napkins, which includes the steps of forming on a carrier layer a dimensionally uniform horizontally moving web of fiberized wood pulp having a body, top and bottom surfaces, and a central zone; applying water absorbent polymer particles onto the top surface across the central zone of the moving web by means of a spreader having a delivery end corresponding in width to the width of the central zone, in the amount of about 1 to 11.5 parts by weight of wood pulp fiber in the central zone for each part by weight of polymer; and distributing the surface applied particles into the central zone of the moving web by air pressure means such that the particles become mutually dispersed within voids in the body of the central zone of the web, the steps being carried out at a constant rate to produce a web having polymer-free lateral zones and a polymer-containing central zone.
Claim 2
Independent Claim
174 words
A method of producing a fluid absorbent web for the manufacture of disposable absorbent articles such as diapers, underpads and sanitary napkins, which includes the steps of forming on a carrier layer a dimensionally uniform horizontally moving web of fiberized wood pulp having a body, top and bottom surfaces, and a central zone; applying water absorbent polymer particles onto the top surface across the central zone of the moving web by means of a spreader having a delivery end corresponding in width to the width of the central zone, in the amount of about 1 to 11.5 parts by weight of wood pulp fiber in the central zone for each part by weight of polymer; and distributing the surface applied particles into the central zone of the moving web by air pressure means such that the particles become mutually dispersed within voids in the body of the central zone of the web, the steps being carried out at a constant rate to produce a web having polymer-free lateral zones and a polymer-containing central zone.
Claim 3
Dependent Claim
14 words
Method according to claim 1 where the carrier layer is a layer of wadding.
Claim 4
Dependent Claim
15 words
Method according to claim 1 where the polymer particles measure about 250 microns or less.
References Cited (Backward Citations)
US2544019A
Cited
US2981999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |