US4199109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recovering different plastic materials from laminated articles
Assignee: Toppan Inc
•
Filing: 1978-06-20
•
Granted: 1980-04-22
•
Expires: 1998-06-20
Abstract
Abstract A method for recovering plastics which is easy in working and effective in separation of materials. The method comprises the steps of: heating multilayer plastic articles, immediately crushing the heated plastic articles by means of shearing, impact or tearing force and peeling the layers of the plastic articles into small pieces of respective component layer materials, and separating the crushed and peeled pieces of materials into the respective component layer materials, thereby recovering the component layer materials in separated state.
Inventors
- 👤 Tadao Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:01
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/06; B03B9/061; B03C; B03C7/00; B29; B29B; B29B17/00; B29B17/02; B29B2017/0213; B29B2017/0217; B29B2017/0234; B29B2017/0237; B29B2017/0244; B29B2017/0262; B29B2017/0265; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/10; B29K2023/12; B29K2031/00; B29K2031/04; B29K2077/00; B29L; B29L2007/00; B29L2007/008; B29L2009/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/52; Y02W30/62; Y10; Y10S; Y10S156/00; Y10S156/934; Y10S156/935; Y10T; Y10T156/00; Y10T156/19
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
A method for separating and recovering the plastics contained in multilayer plastic articles comprising a plurality of layers of plastic components, said method comprising heating said multilayer plastic articles, crushing said heated plastic articles by the application of shearing, impact or tearing force so as to peel the layers of said plastic articles and produce comminuted pieces of said separate plastic components, and separating said comminuted pieces of each of said separate plastic components from each other.
Claim 2
Independent Claim
77 words
A method for separating and recovering the plastics contained in multilayer plastic articles comprising a plurality of layers of plastic components, said method comprising heating said multilayer plastic articles, crushing said heated plastic articles by the application of shearing, impact or tearing force so as to peel the layers of said plastic articles and produce comminuted pieces of said separate plastic components, and separating said comminuted pieces of each of said separate plastic components from each other.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said shearing, impact or tearing force is applied by means of a rapidly rotating impact element.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein said plastic articles are heated to a temperature below the lowest melting point of said plastic components.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein said temperature is between about 80° and 200° C.
Claim 6
Dependent Claim
33 words
The method of claim 1 wherein said layers of said plastic components includes at least one layer selected from the group consisting of nylon and a saponification product of ethylene vinyl acetate copolymer.
Claim 7
Dependent Claim
45 words
The method of claim 1 wherein said layers of said plastic components includes at least one layer selected from the group consisting of polyethylene, polypropylene, polyethylene combined with extender pigments or reformed resins, and polypropylene combined with extender pigments or reformed resins, and mixtures thereof.
Claim 8
Dependent Claim
27 words
The method of claim 1 wherein said comminuted pieces of each of said plastic components is separated from each other by differences in the specific gravities thereof.
Claim 9
Dependent Claim
58 words
The method of claim 7 wherein said comminuted pieces of each of said plastic components are separated from each other by placement in water whereby the comminuted pieces of one of said plastic components having a first specific gravity floats in said water and said comminuted pieces of said other of said plastic components sinks in said water.
Claim 10
Dependent Claim
28 words
The method of claim 1 wherein said comminuted pieces of each of said plastic components is separated from each other by differences in the sizes and shapes thereof.
Claim 11
Dependent Claim
27 words
The method of claim 9 wherein said comminuted pieces of each of said plastic components is separated from each other by impingement of an air current thereon.
Claim 12
Dependent Claim
27 words
The method of claim 1 wherein said comminuted pieces of each of said plastic components is separated from each other by differences in the dielectric constants thereof.
Claim 13
Dependent Claim
52 words
The method of claim 11 wherein said comminuted pieces of each of said plastic components is separated from each other by attracting said comminuted pieces of one of said plastic components to a positive electrode and by attracting said comminuted pieces of said other of said plastic components to a negative electrode.
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) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |