US5268074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recycling polymeric film
Assignee: BANK OF OKLAHOMA NA
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Filing: 1991-03-21
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Granted: 1993-12-07
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Expires: 2011-03-21
Abstract
Abstract A method for producing rolled plastic pellets comprising from about 5 to about 10 weight percent cellulosic fiber and less than about 10 weight percent water from mixed plastic waste comprising polymeric film.
Inventors
- 👤 Joe G. Brooks
- 👤 Billy D. Goforth
- 👤 Charles L. Goforth
- 👤 J. Douglas Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:40
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/28; B03B1/00; B03B1/04; B03B9/00; B03B9/06; B03B9/061; B29; B29B; B29B17/00; B29B17/02; D; D21; D21B; D21B1/00; D21B1/02; D21B1/026; D21B1/04; D21B1/12; D21B1/30; D21B1/32; D21B1/322; B29B2017/0213; B29B2017/0217; B29B2017/0237; B29B2017/0244; B29B2017/0286; B29B2017/0289; B29B17/04; B29B2017/0424; B29B2017/0484; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2105/00; B29K2105/06; B29K2105/065; B29K2705/00; B29K2711/00; B29K2711/12; B29K2711/14; B29L; B29L2007/00; B29L2007/008; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/52; Y02W30/62; Y02W30/64
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
133 words
A method for reclaiming polymeric film from mixed plastic waste comprising polymeric film and cellulosic fiber, said method comprising the steps of: Introducing the plastic waste into apparatus adapted to reduce the polymeric film to pieces having a maximum dimension ranging between about 1 inch and about 4 inches; Separating the polymeric film from a portion of the cellulosic fiber by passing the plastic waste through at least one wash tank; Further reducing the size of the pieces of polymeric film to pieces having a maximum dimension of about 1/2 inch; Separating the polymeric film and a further portion of the cellulosic fiber by flotation with agitation; Dewatering the polymeric film; Drying the polymeric film to a moisture content of less than about 10 weight percent; and Rolling the polymeric film into pellets.
Claim 2
Dependent Claim
22 words
The method of claim 1 wherein the plastic waste comprises from about 6 percent to about 33 percent cellulosic fiber by weight.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein the plastic waste is baled.
Claim 4
Dependent Claim
32 words
The method of claim 3 wherein the baled plastic waste is cut into sections before reducing the pieces of polymeric film to a maximum dimension between about 1 and about 4 inches.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the plastic waste is screened prior to washing.
Claim 6
Dependent Claim
37 words
The method of claim 1 wherein the step of reducing the polymeric film to pieces having a maximum dimension between about 1 and about 4 inches includes the step of reducing the plastic waste in a shredder.
Claim 7
Dependent Claim
33 words
The method of claim 1 wherein the step of reducing the polymeric film to a maximum dimension of about 1/2 inch includes the step of reducing the maximum dimension in a wet grinder.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein the step of dewatering the polymeric film comprises the step of passing it through a screw press for dewatering.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein the dewatered polymeric film is dried to a moisture content or less than about 10 weight percent.
Claim 10
Dependent Claim
29 words
The method of claim 1 comprising the additional step of passing the dried polymeric film through a cyclone separator to remove an additional portion of the cellulosic fiber therefrom.
Claim 11
Dependent Claim
21 words
The method of claim 1 wherein the pellets comprise from about 5 percent to about 10 percent cellulosic fiber by weight.
Claim 12
Dependent Claim
17 words
The method of claim 1 wherein the pellets comprise less than about 8 percent moisture by weight.
Claim 13
Dependent Claim
13 words
The method of claim 1 wherein the polymeric film is high density polyethylene.
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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) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |