US4208015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of regeneration of plastics material by removing outer deteriorated layer
Assignee: Meiji Rubber and Chemical Co Ltd
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Filing: 1978-10-06
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Granted: 1980-06-17
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Expires: 1998-10-06
Abstract
Abstract Method of regeneration of plastics material with higher quality from scrapped plastics, in which scrapped plastics having deteriorated surface layer caused by, such as, exposure to ultraviolet rays etc. are chopped, broken or crushed into fragmented product and this product is subjected to agitation in the presence of aqueous medium and solid particles exhibiting higher hardness than the product to scrape off the deteriorated surface layer of the scrapped plastics, whereupon the plastics material is recovered.
Inventors
- 👤 Masanao Fujita
- 👤 Toshiaki Sugawara
- 👤 Keizo Oosaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:01
CPC Classifications
B; B29; B29B; B29B17/00; B29B17/0026; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A method of regenerating plastic material of a higher quality from a scrapped plastic material bearing a deteriorated surface layer, comprising the steps of: comminuting said scrap plastic material to form a plurality of plastic particles having a size in the range of from about 5 to about 40 mm; agitating said plastic materials at high speed in the presence of an aqueous medium and a plurality of solid particles having a higher hardness than said plastic particles; continuing said agitating operation until said deterioration layer has been removed from said plastic particles; and separating the plastic particles from said removed deterioration layer and said solid particles.
Claim 2
Independent Claim
107 words
A method of regenerating plastic material of a higher quality from a scrapped plastic material bearing a deteriorated surface layer, comprising the steps of: comminuting said scrap plastic material to form a plurality of plastic particles having a size in the range of from about 5 to about 40 mm; agitating said plastic materials at high speed in the presence of an aqueous medium and a plurality of solid particles having a higher hardness than said plastic particles; continuing said agitating operation until said deterioration layer has been removed from said plastic particles; and separating the plastic particles from said removed deterioration layer and said solid particles.
Claim 3
Dependent Claim
20 words
The method according to claim 1, wherein said solid particles consist of silica sand, fused alumina or a mixture thereof.
Claim 4
Dependent Claim
21 words
The method according to claim 2, wherein the particle size of said solid particles is within the range of 2-7 mm.
Claim 5
Dependent Claim
12 words
The method according to claim 1, wherein said aqueous medium is water.
Claim 6
Dependent Claim
42 words
The method according to claim 1, wherein said solid particles and said aqueous medium are employed each in an amount of 3.5-12 parts by weight and of 1.5-8 parts by weight respectively per one part by weight of the scrapped plastic material.
Claim 7
Dependent Claim
25 words
The method according to claim 1, wherein the agitation is conducted with an agitating blade at a circumferential velocity in the range of 4˜13 m/sec.
Claim 8
Dependent Claim
29 words
The method according to claim 1 wherein said separating step is performed by sedimentation, said plastic particles being thereafter separated from said removed deterioration layer by employing a screen.
Claim 9
Dependent Claim
13 words
A regenerated plastic material produced by the method of any of claims 1-7.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |