Patent US943492A successfully refreshed from Google Patents.
Patent US3884855A successfully refreshed from Google Patents.
US3884855A
Expired / Lapsed
US
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Process for the production of regenerate from polypropylene waste
Assignee: Davy Ashmore AG
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Filing: 1973-11-02
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Granted: 1975-05-20
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Expires: 1993-11-02
Abstract
Abstract Regenerate produced from ''''wool,'''' fiber, band and foil waste products from a polypropylene process are processed to produce a material suitable for reintroduction into the process. The polypropylene regenerate is produced by comminuting the waste and forming a fleece. The fleece is washed and dried, divided into fiber clusters, and the clusters are compacted. The compacted product, after granulation, may be passed back to the high polymer process.
Inventors
- 👤 Reinhold Baumann
- 👤 Robert Lauerbach-Lemeier
- 👤 Ernst-Gunter Kunze
- 👤 Alfred Striebich
- 👤 Hans-Joachim Rothe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:09
CPC Classifications
B; B29; B29B; B29B17/00; B29B17/04; B29B17/0412; B29B17/0026; B29B17/0036; C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; D; D01; D01D; D01D10/00; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4274; D04H1/4282; D04H1/4291; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
A PROCESS FOR THE PRODUCTION OF REGENERATE FROM THE WASTE PRODUCT FROM A PROCESS FOR PRODUCING SYNTHETIC POLYPROPYLENE FIBERS, SAID POLYPROPYLENE WASTE PRODUCTS WOOL, FIBERS, BANDS OR FOIL WHICH COMPRISES THE STEPS OF: I. CUTTING THE POLYPROPYLENE WASTE PRODUCT TO PRODUCE A CUT WASTE PRODUCT; II. SPREADING THE CUT WASTE PRODUCTS INTO A FLEECE; III. WASHING SAID FLEECE IN A WASHING ZONE TO PRODUCE A WET, WASHED FLEECE; IV. DRYING THE WASHED FLEECE IN A DRYING ZONE TO PRODUCE A DRIED FLEECE; V. DIVIDING SAID FLEECE INTO FIBER CLUSTERS; VI. COMPACTING THE FIBER CLUSTERS TO PRODUCE A COMPACTED WASTE MATERIAL; AND VII. GRANULATING THE COMPACTED WASTE MATERIAL TO PRODUCE A REGENERATE.
Claim 2
Dependent Claim
111 words
A PROCESS FOR THE PRODUCTION OF REGENERATE FROM THE WASTE PRODUCT FROM A PROCESS FOR PRODUCING SYNTHETIC POLYPROPYLENE FIBERS, SAID POLYPROPYLENE WASTE PRODUCTS WOOL, FIBERS, BANDS OR FOIL WHICH COMPRISES THE STEPS OF: I. CUTTING THE POLYPROPYLENE WASTE PRODUCT TO PRODUCE A CUT WASTE PRODUCT; II. SPREADING THE CUT WASTE PRODUCTS INTO A FLEECE; III. WASHING SAID FLEECE IN A WASHING ZONE TO PRODUCE A WET, WASHED FLEECE; IV. DRYING THE WASHED FLEECE IN A DRYING ZONE TO PRODUCE A DRIED FLEECE; V. DIVIDING SAID FLEECE INTO FIBER CLUSTERS; VI. COMPACTING THE FIBER CLUSTERS TO PRODUCE A COMPACTED WASTE MATERIAL; AND VII. GRANULATING THE COMPACTED WASTE MATERIAL TO PRODUCE A REGENERATE.
Claim 3
Dependent Claim
44 words
A process according to claim 1 wherein the cutting of step (i) is accomplished by cutting the waste product to a size between 1 and 15 mm with respect to the greatest dimension and the granulate size amounts to between 2 and 6 mm.
Claim 4
Dependent Claim
27 words
A process according to claim 1 wherein the granulated regenerate is returned to a main product stream in the polymer process by means of a degasing extruder.
Claim 5
Dependent Claim
21 words
A process according to claim 1 wherein the fiber clusters are compacted in the compacting step in admixture with a lubricant.
Claim 6
Dependent Claim
35 words
A process according to claim 1 wherein there is added at least one additive to generate a delustered material, said additive added in an amount of 0.01% to 10% by weight of the waste products.
Claim 7
Dependent Claim
18 words
A process according to claim 5 wherein said additive is titanium dioxide, carbon black or a dye pigment.
Claim 8
Dependent Claim
36 words
A process according to claim 1 wherein the temperature of the washing step is between 20* and 60*C and the washing step is affected with an aqueous solution containing 0.05% to 0.9% by weight washing agent.
Claim 9
Dependent Claim
31 words
A process according to claim 1 wherein the drying tempeature is between 20* and 60*C with a residence time of the waste in the drying zone of 2 to 15 minutes.
Claim 10
Dependent Claim
26 words
A process according to claim 1 wherein the compacting process is effected under the action of high sheering forces in a disk compactor with heat withdrawal.
Claim 11
Dependent Claim
16 words
A process according to claim 1 wherein the compacting operation takes place under exclusion of oxygen.
Claim 12
Dependent Claim
23 words
A process according to claim 1 wherein said fleece is squeezed of moisture to produce a squeezed fleece prior to the drying step.
Claim 13
Dependent Claim
16 words
A process according to claim 11 wherein the squeezed fleece is loosened before the drying step.
References Cited (Backward Citations)
US3344218A
Cited
US3223581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |