Patent US3874962A successfully refreshed from Google Patents.
US3874962A
Expired / Lapsed
US
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Apparatus for the continuous production of thin wood-wool boards
Assignee: KraussMaffei Extrusion GmbH
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Filing: 1973-05-08
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Granted: 1975-04-01
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Expires: 1993-05-08
Abstract
Abstract The production of thin wood-wool or wood shavings boards is effected by a method carried out with the aid of a heated drum of large diameter which cooperates with one or more heated pressure rollers of relatively smaller diameter to compact wood-wool carried on an endless band to which wool and adhesive has been applied. Infra-red or other heat acts on the compacted wood-wool and the band eventually delivers the partially cured board to cutters or to another machine.
Inventors
- 👤 Rolf Gersbeck
- 👤 Reinhold Reschke
- 👤 Reinhold Posielsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:19
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/26
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
202 words
A METHOD CONTINUOUSLY PRODUCING WOOD-WOOL BOARDS WITH THICKNESS UP TO 8 MM COMPRISING THE STEPS OF DEPOSITING WOOD-WOOL AND A BINDING AGENT ON AN ENDLESS BAND TO FORM A CONTINUOUSLY DEPOSITED LAYER OF WOODWOOL IMPREGNATED WITH A BONDING AGENT, PREHEATING THE UNDERSIDE OF SAID BAND BY UNDERLYING INFRARED HEATING MEANS WHILE SAID LAYER IS TRAVELING ON SAID BAND PRIOR TO THE PRESSING STEP, PRESSING BY MEANS OF THE BAND THE SAID LAYER AGAINST A MAJOR PROPORTION OF THE PERIPHERY OF A HEATED ROTARY DRUM, APPLYING PRESSURE ALONG A LINE TRANSVERSE TO THE DIRECTION OF MOTION OF THE LAYER SIMULTANEOUSLY WITH SAID PRESSING, THE SAID TRANSVERSE PRESSURE BEING SUBSTANTIALLY IN EXCESS OF THE PRESSURE EXERTED ON THE LAYER BY THE BAND AND DRUM ALONE, SAID LINEAR PRESSURE BEING EXERTED BY A HEATED ROLLER JUXTAPOSED TO THE DRUM SUBSTANTIALLY IMMEDIATELY FOLLOWING A LOCATION PROXIMATE WHERE SAID BAND AND SAID DRUM INITIALLY COME INTO JUXTAPOSITION, AND APPLYING HEAT BY INFRARED RADIATION TO THE SIDE OF SAID BAND OPPOSITE SAID DRUM FOR THE REMAINING PRESSING OF SAID LAYER BETWEEN SAID BAND AND THE HEATED PERIPHERY OF SAID DRUM WHEREBY THE LAYER DURING SAID REMAINING PRESSURING IS CONTINUALLY HEAT BY BOTH THE DRUM AND THE BAND .
Claim 2
Independent Claim
202 words
A METHOD CONTINUOUSLY PRODUCING WOOD-WOOL BOARDS WITH THICKNESS UP TO 8 MM COMPRISING THE STEPS OF DEPOSITING WOOD-WOOL AND A BINDING AGENT ON AN ENDLESS BAND TO FORM A CONTINUOUSLY DEPOSITED LAYER OF WOODWOOL IMPREGNATED WITH A BONDING AGENT, PREHEATING THE UNDERSIDE OF SAID BAND BY UNDERLYING INFRARED HEATING MEANS WHILE SAID LAYER IS TRAVELING ON SAID BAND PRIOR TO THE PRESSING STEP, PRESSING BY MEANS OF THE BAND THE SAID LAYER AGAINST A MAJOR PROPORTION OF THE PERIPHERY OF A HEATED ROTARY DRUM, APPLYING PRESSURE ALONG A LINE TRANSVERSE TO THE DIRECTION OF MOTION OF THE LAYER SIMULTANEOUSLY WITH SAID PRESSING, THE SAID TRANSVERSE PRESSURE BEING SUBSTANTIALLY IN EXCESS OF THE PRESSURE EXERTED ON THE LAYER BY THE BAND AND DRUM ALONE, SAID LINEAR PRESSURE BEING EXERTED BY A HEATED ROLLER JUXTAPOSED TO THE DRUM SUBSTANTIALLY IMMEDIATELY FOLLOWING A LOCATION PROXIMATE WHERE SAID BAND AND SAID DRUM INITIALLY COME INTO JUXTAPOSITION, AND APPLYING HEAT BY INFRARED RADIATION TO THE SIDE OF SAID BAND OPPOSITE SAID DRUM FOR THE REMAINING PRESSING OF SAID LAYER BETWEEN SAID BAND AND THE HEATED PERIPHERY OF SAID DRUM WHEREBY THE LAYER DURING SAID REMAINING PRESSURING IS CONTINUALLY HEAT BY BOTH THE DRUM AND THE BAND .
Claim 3
Dependent Claim
35 words
A method according to claim 1, wherein the wood-wool is distributed on the surface of the band at a position spaced from a line at which the band and the drum initially come into juxtaposition.
Claim 4
Dependent Claim
39 words
A method according to claim 2, wherein pressure is applied to the band along a plurality of lines transverse to the direction of movement of the band and the layer, said lines of pressure being applied by heated rollers.
Claim 5
Dependent Claim
26 words
A method according to claim 3, wherein heat is supplied to the layer between at least two of the lines at which transverse pressure is applied.
Claim 6
Dependent Claim
42 words
A method according to claim 2, wherein a layer of foil is applied and bonded to one face of the layer, said foil being applied to the layer at said line and on the face of the layer directed towards the drum.
Claim 7
Dependent Claim
40 words
A method according to claim 1, wherein the wood-wool layer is formed from an inner layer of relatively coarse wood-wool particles and two outer layers of relatively fine wood-wool particles, said binding agent including a glue, a hardener and water.
Claim 8
Dependent Claim
39 words
A method according to claim 1, wherein the drum has a diameter in the range 1,500 to 6,000 mm. and said roller applying linear pressure to the wood-wool layer has a diameter in the range 900 to 2,500 mm.
Claim 9
Dependent Claim
32 words
A method according to claim 7, wherein the drum has a diameter in the range 2,400 to 4,000 mm. and said roller has a diameter in the range 1,100 to 1,800 mm.
Claim 10
Dependent Claim
20 words
A method according to claim 1, wherein the drum is heated to a temperature in the range 120*C to 200*C.
Claim 11
Dependent Claim
20 words
A method according to claim 9, wherein the drum is heated to a temperature in the range 140*C to 160*C.
Claim 12
Dependent Claim
21 words
A method according to claim 1, wherein the linear-pressure-applying roller is maintained at a temperature in the range 120*C and 220*C.
Claim 13
Dependent Claim
17 words
A method according to claim 11, wherein the said linear-pressure-applying roller has a temperature of about 180*C.
Claim 14
Dependent Claim
27 words
A method according to claim 1, wherein the band during its passage around the periphery of the drum has a temperature in the range 100*C to 150*C.
Claim 15
Dependent Claim
15 words
A method according to claim 13, wherein the band has a temperature of about 110*C.
Claim 16
Dependent Claim
41 words
A method according to claim 1, wherein the roller applying linear pressure subjects the layer of wood-wool to a pressure in the range 250 to 600 kg./cm. length measured transversely of the direction of movement of the band and the layer.
Claim 17
Dependent Claim
31 words
A method according to claim 1, wherein the pressure exerted by the band on the drum and on the layer of wood-wool is in the range 1.5 kg./cm2 to 2.5 kg./cm2.
Claim 18
Dependent Claim
20 words
A method according to claim 16 wherein the pressure exerted by the band on the drum is approximately 2 kg./cm2.
Claim 19
Dependent Claim
19 words
A method according to claim 3, wherein the pressure exerted by said additional rollers amounts to 350 kg./cm. length.
References Cited (Backward Citations)
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US3536549A
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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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |