US3904336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making pressed board
Assignee: G Siempelkamp GmbH and Co KG
•
Filing: 1973-07-30
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Granted: 1975-09-09
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Expires: 1993-07-30
Abstract
Abstract In manufacturing pressed boards, a flowable mixture of thermosetting resinous material and filler is blown through one or more nozzles into a converging throat formed by a pair of relatively inclined perforated conveyor bands in which the mixture is compacted into a continuous, coherent but preferably still pliable web by the application of heat to preset the resinous material thereof. The web may be immediately converted into a rigid board by being led, without intermediate cooling, into a continuously working press for final condensation of the resin; on the way to that press it may be subjected to a finishing operation, as by adhesion of preheated strips of paper or other coverings to its still tacky surfaces.
Inventors
- 👤 Heinrich Axer
- 👤 Gerd Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:57
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/20; B27N1/00; B27N1/02; B27N1/029; B27N3/06; B27N3/10; B27N3/14; B27N3/143; B27N3/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
In an apparatus for making pressed board from thermosetting resinous material and filler, in combination: a pair of perforated, endless conveyor bands with generally horizontal, relatively inclined confronting surfaces forming a converging throat between them; nozzle means adjacent said conveyor bands for continuously blowing a substantially horizontal stream of thermosetting resinous material and filler entrained by a carrier fluid into said throat from the broad end thereof; heating means at said throat for at least partly setting said resinous material during compaction of the mixture between said conveyor bands into a continuous and coherent web; a continuously operating press adjoining said conveyor bands at the narrow end of said throat for receiving said web therefrom and further compacting same with final setting of said resinous material; and a finishing stage inserted between said conveyor bands and said press, said finishing stage being provided with supplemental heating means for at least maintaining the temperature of the web issuing from said throat.
Claim 2
Dependent Claim
160 words
In an apparatus for making pressed board from thermosetting resinous material and filler, in combination: a pair of perforated, endless conveyor bands with generally horizontal, relatively inclined confronting surfaces forming a converging throat between them; nozzle means adjacent said conveyor bands for continuously blowing a substantially horizontal stream of thermosetting resinous material and filler entrained by a carrier fluid into said throat from the broad end thereof; heating means at said throat for at least partly setting said resinous material during compaction of the mixture between said conveyor bands into a continuous and coherent web; a continuously operating press adjoining said conveyor bands at the narrow end of said throat for receiving said web therefrom and further compacting same with final setting of said resinous material; and a finishing stage inserted between said conveyor bands and said press, said finishing stage being provided with supplemental heating means for at least maintaining the temperature of the web issuing from said throat.
Claim 3
Dependent Claim
25 words
The combination defined in claim 1 wherein said conveyor bands are provided with respective pressure plates for compacting the mixture of resinous material and filler.
Claim 4
Dependent Claim
27 words
The combination defined in claim 2 wherein said pressure plates are provided with channels, said heating means comprising a source of hot fluid circulating through said channels.
Claim 5
Dependent Claim
32 words
The combination defined in claim 2 wherein said heating means comprises a pair of electrodes connected across a high-frequency generator, said electrodes being constituted at least in part by said pressure plates.
Claim 6
Dependent Claim
26 words
The combination defined in claim 1, further comprising guide means for said mixture bracketing said nozzle means and narrowing toward the broad end of said throat.
Claim 7
Dependent Claim
23 words
The combination as defined in claim 1 wherein said heating means comprises a heater for said carrier fluid ahead of said nozzle means.
Claim 8
Dependent Claim
48 words
The combination defined in claim 1 wherein said finishing stage includes a supply of covering material for at least one surface of said web, said supplemental heating means being juxtaposed with said supply for elevating the temperature of said covering material prior to application thereof to said surface.
Claim 9
Dependent Claim
39 words
The combination defined in claim 1 wherein said filler consists predominantly of narrow particles, further comprising orienting means at said throat for positioning said particleS in said stream generally transversely to the direction of motion of said conveyor bands.
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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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |