US4268340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming an absorbent article
Assignee: Colgate Palmolive Co
•
Filing: 1979-03-07
•
Granted: 1981-05-19
•
Expires: 1999-03-07
Abstract
Abstract An absorbent article comprising, an absorbent pad having a mass of hydrophilic fibers and a matrix of a comminuted hydrophobic material dispersed in the interfiber spaces defined by the fibers throughout at least a portion of the pad.
Inventors
- 👤 Harry G. Fitzgerald
- 👤 Donald Patience
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:47
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/26; A; A61; A61F; A61F13/00; A61F13/15; A61F13/15577; A61F13/15617; D21H27/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
186 words
The method of making a disposable absorbent pad comprising the steps of: collecting a quantity of raw materials including both hydrophilic and hydrophobic materials, said hydrophobic materials being at least in part thermoplastic sheet material; simultaneously comminuting said raw materials together to provide a mixture of non-fibrous hydrophobic particles and hydrophilic fibers; forming said mixture of particles and fibers into a fibrous web comprising a mass of said hydrophilic fibers and a matrix of said non-fibrous hydrophobic particles dispersed throughout said web in interfiber spaces defined by said fibers; simultaneously heating and compressing said web to fuse said hydrophobic particles to said hydrophilic fibers without completely destroying said particles; winding said web into a feed roll; providing a second feed roll containing compressed hydrophilic materials; unwinding webs from said first and said second feed rolls; simultaneously comminuting portions of said webs into a fibrous mass; and, forming said fibrous mass into sections as pads, said unwinding and simultaneous comminuting being controlled such that said pads include 1 to 15 percent by weight said non-fibrous hydrophobic particles and 85 to 99 percent by weight said hydrophilic fibers.
Claim 2
Independent Claim
186 words
The method of making a disposable absorbent pad comprising the steps of: collecting a quantity of raw materials including both hydrophilic and hydrophobic materials, said hydrophobic materials being at least in part thermoplastic sheet material; simultaneously comminuting said raw materials together to provide a mixture of non-fibrous hydrophobic particles and hydrophilic fibers; forming said mixture of particles and fibers into a fibrous web comprising a mass of said hydrophilic fibers and a matrix of said non-fibrous hydrophobic particles dispersed throughout said web in interfiber spaces defined by said fibers; simultaneously heating and compressing said web to fuse said hydrophobic particles to said hydrophilic fibers without completely destroying said particles; winding said web into a feed roll; providing a second feed roll containing compressed hydrophilic materials; unwinding webs from said first and said second feed rolls; simultaneously comminuting portions of said webs into a fibrous mass; and, forming said fibrous mass into sections as pads, said unwinding and simultaneous comminuting being controlled such that said pads include 1 to 15 percent by weight said non-fibrous hydrophobic particles and 85 to 99 percent by weight said hydrophilic fibers.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein said thermoplastic sheet material is a backing sheet having a thickness greater than or equal to 1 mil.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said raw material includes a comminuted waste absorbent article which includes a hydrophobic sheet material.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein said heating and compressing step comprises the step of calendering said fibrous web.
Claim 6
Dependent Claim
57 words
The method of claim 4 wherein said calendering step comprises the steps of simultaneously compressing and heating the fibrous web with a first calender at a first temperature into a compacted web, and simultaneously compressing and heating the compacted web passing from the first calender with a second calender at a second temperature into said compressed web.
Claim 7
Dependent Claim
22 words
The method of claim 1 including the step of wetting said fibrous web with a liquid before said compressing and heating step.
Claim 8
Dependent Claim
29 words
The method of claim 1 wherein said new materials are shredded by a shredder and including the step of limiting the quantity of said materials supplied to the shredder.
Claim 9
Dependent Claim
18 words
The method of claim 7 including the step of separating the lighter and heavier of the shredded particles.
Claim 10
Dependent Claim
22 words
The method of claim 8 including the steps of discarding the lighter of said particles, and collecting the heavier of said particles.
Claim 11
Dependent Claim
40 words
The method of claim 1 wherein said quantity of raw materials is in the range of 5 to 25 percent waste feed material and 75 to 95 percent virgin feed material, said waste feed material including said thermoplastic sheet material.
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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) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |