US3758655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of rough blocks
Assignee: Dynamit Nobel AG
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Filing: 1970-04-29
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Granted: 1973-09-11
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Expires: 1990-04-29
Abstract
Abstract A process for the production of sheeting from chips of a thermoplastic material includes the steps of forming a granulated thermoplastic synthetic polymeric material transversely and longitudinally into a crude sheet, cutting the crude sheet into transverse strips, and cutting the transverse strips longitudinally into chips having approximately rectangular configurations. Thereafter the process further includes stacking the chips in a uniform distribution in a thin layer, heating the stacked chips to sinter the layer of stacked chips into a sheet, winding the sheet into a round multilayered block, radially compressing the multilayered block, cooling the compressed block and peripherally paring the compressed block into sheeting.
Inventors
- 👤 M Wienand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:00
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/222; B29B; B29B11/00; B29B11/02; B29B11/06; B29C31/00; B29C31/04; B29C31/08; B29C31/085; B29C43/228; B29C43/30; B29C43/305; B29C67/00; D; D06; D06N; D06N7/00; D06N7/0005; D06N7/0028; D06N7/0039; D06N7/0057; B29C43/32; B29C43/34; B29C2043/3405; B29C2043/3416; B29C43/44; B29C43/46
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
12 words
The process of claim 1, wherein said chips have approximately rectangular configurations.
Claim 2
Dependent Claim
25 words
The process of claim 2, wherein the thickness of the thin layer of the stacked chips to be sintered is about 2 to 30 mm.
Claim 3
Dependent Claim
25 words
The process of claim 2, wherein the thickness of the thin layer of the stacked chips to be sintered is about 4 to 20 mm.
Claim 4
Dependent Claim
37 words
The process of claim 1, wherein in step (b) the heating of the thin layer of stacked chips is conducted in two heating stages, the thin layer being subjected to preliminary compression between said two heating stages.
Claim 5
Dependent Claim
28 words
The process of claim 5, wherein the heating of the stacked chips in the first stage is conducted at a temperature lower than that of the second stage.
Claim 6
Dependent Claim
18 words
The process of claim 6, wherein the second stage is conducted at a temperature of about 170*-180* C.
Claim 7
Dependent Claim
49 words
The process of claim 1, wherein after step (c) said multi-layered round block has end faces, before step (d) the end faces of the multi-layered round block are axially compressed to about the width of the crude sheet and then in step (d) the round block is compressed radially.
Claim 8
Dependent Claim
17 words
The process of claim 8, wherein the round block is compressed radially by a hydraulic press means.
Claim 9
Dependent Claim
17 words
The process of claim 8, wherein the round block is compressed radially by a pneumatic press means.
Claim 10
Dependent Claim
19 words
The process of claim 8, wherein the round block is compressed radially from the outside of the round block.
Claim 11
Dependent Claim
19 words
The process of claim 8, wherein the round block is cooled internally by said cooled core in step (e).
Claim 12
Dependent Claim
124 words
A process for the production of sheeting from granulated thermoplastic synthetic polymeric material which comprises: a. calendering a granulated thermoplastic synthetic polymeric material into at least one crude sheet, b. cutting said crude sheet into transverse strips, c. cutting said transverse strips longiduinally into chips having approximately rectangular configurations, d. stacking said chips in a uniform distribution in a thin layer, e. heating the thin layer of stacked chips to sinter said stacked chips into a sintered sheet, f. winding said sintered sheet into a multi-layered round block, g. radially compressing said multi-layered round block to fuse said multi-layers, h. cooling the compressed fused block with a cooled core disposed in said compressed block, and i. peripherally paring said compressed fused block into sheeting.
Claim 13
Dependent Claim
25 words
The process of claim 13, wherein the thickness of the thin layer of the stacked chips to be sintered is about 2 to 30 mm.
Claim 14
Dependent Claim
25 words
The process of claim 13, wherein the thicknes of the thin layer of the stacked chips to be sintered is about 4 to 20 mm.
Claim 15
Dependent Claim
33 words
The process of claim 13 wherein the heating of the thin layer of the stacked chips is conducted in heating stages, the thin layer being subjected to preliminary compression between said heating stages.
Claim 16
Dependent Claim
39 words
The process of claim 13, wherein the heating of the stacked chips in step (e) is conducted in two stages, the heating in the first stage is being conducted at a temperature lower than that of the second stage.
Claim 17
Dependent Claim
19 words
The process of claim 17, wherein the second heating stage is conducted at a temperature of about 170*-180* C.
Claim 18
Dependent Claim
49 words
The process of claim 13, wherein after step (f) said multi-layered round block has end faces, before step (g) the end faces of the multi-layered round block are axially compressed to about the width of the crude sheet and then in step (g) the round block is compressed radially.
Claim 19
Dependent Claim
49 words
The process of claim 13, wherein in step (a) the granulated thermoplastic material is calendered into a plurality of crude sheets and each of the crude sheets are laminated into a single crude sheet before step (b), said single crude sheet being cut into transverse strips in step (b).
Claim 20
Dependent Claim
34 words
The process of claim 20, wherein before lamination of said crude sheets an electrically conductive material is inserted between the crude sheets followed by subsequent heating of said crude sheets prior to step (b).
Claim 21
Dependent Claim
13 words
The process of claim 21, wherein the electrically conductive material is carbon black.
Claim 22
Dependent Claim
27 words
The process of claim 21, wherein the electrically conductive material is carbon black and the carbon black is brushed, dry, into the surface of the crude sheets.
Claim 23
Dependent Claim
43 words
The process of claim 21, wherein the electrically conductive material is a paste which comprises about 10 to 60 percent by weight carbon black, about 4 to 7 percent by weight plasticizer and about 83 to 90 percent by weight of an alcohol.
Claim 24
Dependent Claim
42 words
The process of claim 21, wherein the electrically conductive material is a paste comprises which about 4 to 17 percent by weight carbon black, about 58 to 67 percent by weight plasticizer and about 25 to 29 percent by weight polyvinyl chloride.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |