Patent US4417932A successfully refreshed from Google Patents.
US4417932A
Expired / Lapsed
US
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Process for the continuous production of a length of stratifield material from foam particles
Assignee: Dynamit Nobel AG
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Filing: 1981-09-25
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Granted: 1983-11-29
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Expires: 2001-09-25
Abstract
Abstract A process for the continuous production of a sheeting of stratified material from synthetic resin foam particles especially particles of crosslinking polyethylene includes the steps of scattering foam particles onto a conveying means, preheating the foam particles during conveyance, superficially to a temperature in the range between 100° and 160° C.; thereafter feeding the thus-preheated foam particles to means defining a free falling zone; causing the preheated particle to free-fall within said zone; further heating the particles during falling, to a temperature of at least 200° C., and, at the end of the free fall, piling up the particles on a support surface; compacting the piled-up particles into a sheet-like layer on said surface; and sizing the preliminarily compacted sheet with simultaneous cooling.
Inventors
- 👤 Hans-Ulrich Breitscheidel
- 👤 Paul Spielau
- 👤 Franz-Werner Alfter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:46
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29B; B29B13/00; B29C44/20; B29C44/30; B29C44/34; B29C44/3461; B29B17/00; B29B17/0026; B29B17/0036; B29K; B29K2023/00; B29K2105/00; B29K2105/04; B29L; B29L2007/00; B29L2009/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
131 words
A process for the continuous production of a sheeting of stratified material from synthetic resin foam particles which are capable, upon the application of heat, of being bonded together with the use of pressure which comprises scattering foam particles onto a conveying means, preheating the foam particles during conveyance, superficially to a temperature in the range between 100° and 160° C.; thereafter feeding the thus-preheated foam particles to means defining a free falling zone, causing the preheated particle to freefall within said zone, further heating the particles during falling, to a temperature of at least 200° C., and, at the end of the free fall, piling up the particles on a support surface, compacting the piled-up particles into a sheetlike layer and then sizing the preliminarily compacted sheet with simultaneous cooling.
Claim 2
Dependent Claim
131 words
A process for the continuous production of a sheeting of stratified material from synthetic resin foam particles which are capable, upon the application of heat, of being bonded together with the use of pressure which comprises scattering foam particles onto a conveying means, preheating the foam particles during conveyance, superficially to a temperature in the range between 100° and 160° C.; thereafter feeding the thus-preheated foam particles to means defining a free falling zone, causing the preheated particle to freefall within said zone, further heating the particles during falling, to a temperature of at least 200° C., and, at the end of the free fall, piling up the particles on a support surface, compacting the piled-up particles into a sheetlike layer and then sizing the preliminarily compacted sheet with simultaneous cooling.
Claim 3
Dependent Claim
23 words
A process according to claim 1, wherein a pressure of 0.1-1.0 kp/cm 2 is exerted during the preliminary compacting of the foam particles.
Claim 4
Dependent Claim
23 words
A process according to claim 1 or 2, wherein during sizing of the sheet, a pressure is exerted of 0.2-5.0 kp/cm 2 .
Claim 5
Dependent Claim
24 words
A process according to claim 1, wherein the foam particles have differing densities and are made of the same or a different synthetic resin.
Claim 6
Dependent Claim
21 words
A process according to claim 1, wherein the foam particles are made of polyolefin foam materials, especially crosslinked polyolefin foam materials.
Claim 7
Dependent Claim
24 words
A process according to claim 1, wherein the foam particles are admixed with fillers and binders prior to being compacted into the sheet-like layer.
Claim 8
Dependent Claim
37 words
A process according to claim 1, wherein the preliminarily compacted sheet is bonded with a cover layer made of at least one material selected from the group consisting of synthetic resin, metal, wood, textile material, and paper.
Claim 9
Dependent Claim
35 words
A process according to claim 1, wherein the foam particles are scattered on at least two conveying paths controllable mutually independently with respect to their conveying speed, and are fed to a common free-falling zone.
Claim 10
Dependent Claim
39 words
A process according to claim 1, wherein the sheet is, in the initial phase of the sizing step, cooled directly with water and, in the final phase of the sizing step, is cooled and dried by means of air.
Claim 11
Dependent Claim
22 words
A process according to claim 1, wherein the foam particles are admixed with binders prior to being compacted into the sheet-like layer.
Claim 12
Dependent Claim
22 words
A process according to claim 1, wherein the foam particles are admixed with fillers prior to being compacted into the sheet-like layer.
Claim 13
Dependent Claim
17 words
A process according to claim 7, wherein the cover layer is in the form of a film.
Claim 14
Dependent Claim
17 words
A process according to claim 7, wherein the cover layer is in the form of a fabric.
Claim 15
Dependent Claim
18 words
A process according to claim 7, wherein the cover layer is in the form of a non-woven mat.
Claim 16
Dependent Claim
17 words
A process according to claim 1, wherein the compacted sheet is bonded bilaterally with said cover layer.
References Cited (Backward Citations)
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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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |