US3734669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for continuous manufacture of chipboard
Assignee: Mende Wilhelm and Co
•
Filing: 1971-10-26
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Granted: 1973-05-22
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Expires: 1991-10-26
Abstract
Abstract Apparatus for the continuous manufacture of chipboard comprising an endless steel band encircling a portion of the circumference of a drum and adapted to press and cure the chip material and which includes hot gas heating means for heating the chip material through the steel belt. The heating means comprises a sheet metal housing surrounding the portion of the belt which runs against the drum, an oil heater for discharging hot air and exhaust gas into said housing and a recirculating duct for carrying the discharged gases back to the point where the fresh gases enter the housing. The sheet metal housing may be of a configuration to direct the gases flowing through the housing into a tortuous path to promote heat transfer.
Inventors
- 👤 H Ettel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:27
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
Apparatus for the continuous manufacture of chipboards, comprising an endless band consisting of steel, on to which is scattered a layer of wood chips mixed with binders, said band being under tension and running continuously on to a pressing roller and wrapping partially around the latter, characterized in that the band, in the region in which it wraps around the pressing roller, forms at least partially a duct through which hot gAses are circulated.
Claim 2
Dependent Claim
74 words
Apparatus for the continuous manufacture of chipboards, comprising an endless band consisting of steel, on to which is scattered a layer of wood chips mixed with binders, said band being under tension and running continuously on to a pressing roller and wrapping partially around the latter, characterized in that the band, in the region in which it wraps around the pressing roller, forms at least partially a duct through which hot gAses are circulated.
Claim 3
Dependent Claim
49 words
Apparatus according to claim 1, characterized in that the pressing roller, in the region in which the band wraps around it, is covered with spaced gas-directing plates, both on the circumference and also laterally, so that the gas duct is formed between these air-directing plates and the steel band.
Claim 4
Dependent Claim
15 words
Apparatus according to claim 1, characterized in that this gas duct constitutes a recirculating system.
Claim 5
Dependent Claim
20 words
Apparatus according to claim 2, characterized in that gas-directing plates are disposed to direct the gas towards the steel band.
Claim 6
Dependent Claim
38 words
Apparatus according to claim 4, characterized in that the gas-directing plates lie between pressure rollers, which press the steel band against the pressing roller, so that the gas is directed between the pressure rollers towards the steel band.
Claim 7
Dependent Claim
20 words
Apparatus according to claim 1, characterized in that the hot air is heated by the exhaust gases of a burner.
Claim 8
Dependent Claim
34 words
Apparatus according to claim 6, characterized in that the burner is connected to the circulating system, which system is vented by an excess pressure valve at the point at which the lowest temperatures occur.
References Cited (Backward Citations)
US1953704A
Cited
US2526318A
Cited
US2812542A
Cited
US2991824A
Cited
US3039137A
Cited
US3096227A
Cited
US3241182A
Cited
US3400196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |