US4605467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing steam hardened pressedboard
Assignee: G Siempelkamp GmbH and Co KG
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Filing: 1985-03-29
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Granted: 1986-08-12
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Expires: 2005-03-29
Abstract
Abstract An apparatus for pressing and steam curing a wood-particle mat to produce a wood-particle board includes a pair of pressing belts which are arranged above each other at a distance to define a gap therebetween within which the wood-particle mat is conveyed and shaped. Along its passage through the pressing belts, the wood-particle mat is first moved along a compression zone in which the gap is gradually reduced and then passes along a sizing zone. Cooperating with the pressing is a steam injection unit which includes a steam supply channel system and a steam discharge channel system. Both channel systems border on the pressing gap and are provided with nozzle bores extending towards the gap. Via the supply channel system, steam is injected along the compression zone in direction of the wood-particle mat while the discharge channel system which extends at least along a downstream section of the sizing zone is provided to collect and eventually to discharge steam.
Inventors
- 👤 Friedrich Bottger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:08
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
An apparatus for pressing and steam curing a wood-particle mat to produce a wood-particle board, comprising: a pair of pressing belts for moving the wood-particle mat along a predetermined path, said belts being arranged with a spacing to define a pressing gap therebetween such that a compression zone and a sizing zone are provided in succession along said path; and steam injection means extending laterally along each side of said path and including a first channel system bordering said pressing gap along said compression zone for injecting steam into the mat and a second channel system bordering said pressing gap at least along a section of said sizing zone for collecting and discharging steam.
Claim 2
Independent Claim
114 words
An apparatus for pressing and steam curing a wood-particle mat to produce a wood-particle board, comprising: a pair of pressing belts for moving the wood-particle mat along a predetermined path, said belts being arranged with a spacing to define a pressing gap therebetween such that a compression zone and a sizing zone are provided in succession along said path; and steam injection means extending laterally along each side of said path and including a first channel system bordering said pressing gap along said compression zone for injecting steam into the mat and a second channel system bordering said pressing gap at least along a section of said sizing zone for collecting and discharging steam.
Claim 3
Dependent Claim
22 words
An apparatus as defined in claim 1, further comprising a vacuum source, said second channel system being connected to said vacuum source.
Claim 4
Dependent Claim
39 words
An apparatus as defined in claim 1, further comprising a third channel system for ventilating the passing wood-particle mat, said third channel system bordering on said gap and lying between said first channel system and said second channel system.
Claim 5
Dependent Claim
27 words
An apparatus as defined in claim 3 wherein each of said first, second and third channel systems is provided with nozzle bore extending toward said pressing gap.
Claim 6
Dependent Claim
33 words
An apparatus as defined in claim 1 wherein said first channel systems respectively arranged at each side of said pressing belts are provided to simultaneously supply steam onto the passing wood particle mat.
Claim 7
Dependent Claim
31 words
An apparatus as defined in claim 1 wherein at least one of said first channel systems is alternatively switchable from steam supply to steam discharge at least along a portion thereof.
Claim 8
Dependent Claim
33 words
An apparatus as defined in claim 3 wherein said steam injection means further includes a unitary beam extending along each side of said pressing belts and accommodating said first and second channel systems.
Claim 9
Dependent Claim
16 words
An apparatus as defined in claim 7 wherein said beam further accommodates said third channel system.
Claim 10
Dependent Claim
18 words
An apparatus as defined in claim 7 wherein said beam is provided as a spacer between said belts.
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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) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |