US3734669A - Apparatus for continuous manufacture of chipboard - Google Patents

Apparatus for continuous manufacture of chipboard Download PDF

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Publication number
US3734669A
US3734669A US00192373A US3734669DA US3734669A US 3734669 A US3734669 A US 3734669A US 00192373 A US00192373 A US 00192373A US 3734669D A US3734669D A US 3734669DA US 3734669 A US3734669 A US 3734669A
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band
gas
pressing roller
duct
housing
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US00192373A
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H Ettel
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Mende Wilhelm and Co
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Mende Wilhelm and Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/26—Moulding or pressing characterised by using continuously acting presses having a heated press drum and an endless belt to compress the material between belt and drum

Definitions

  • 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.
  • the invention relates to an arrangement for the continuous manufacture of chipboards, comprising an endless band made of steel, on to which is scattered a layer of wood chips to which binders are added, the said band being under tension and running continuously over a pressing roller and wrapping partially around the latter.
  • the invention has for its object to provide an arrangement for the continuous manufacture of chipboards, with which the heat is supplied from outside towards the band and thus to the layer of wood chips in an economical and simple manner.
  • the object forming the basis of the invention is achieved by the band, in the region in which it wraps around the pressing roller, forming at least partially a part of an air duct through which hot air is flowing.
  • the hot air in the air stream can be simply supplied with the exhaust gas of a burner, more especially an oil burner. Heat can be cheaply produced by such a burner without the more involved method of electric current, which is expensive. Since the exhaust gas of the burner can be fed directly into the air duct, heat exchanges are also superfluous, which would be necessary if the hot air were heated by steam, for example, by heat exchange.
  • the heat transfer between the hot gases and the steel strip is relatively poor, but it can be substantially improved by high flow velocities and by additional guiding plates or plates producing a turbulent flow.
  • the air duct prefferably be arranged to provide a circulation in the region of the wrapping position of the band, so that the discharging air and exhaust gas is recirculated into the entry side.
  • a burner more especially an oil burner
  • This excess pressure valve is most expediently arranged at a position in the circulation where the temperature is lowest. This position is usually just upstream of the connecting point for the burner, that is to say, downstream of the outlet point at the end of the wrapping of the band. It is obvious that all exposed parts of the duct are heat-insulated. The manufacture of the duct or the duct sections is possible in a quite simply manner from comparatively thin sheet metal, because the pressures being set up are low. The heat insulation also does not present any difficulties.
  • chips 2 mixed with a binder are scattered on a band 3, which travels continuously in the direction of an arrow 4 over a table 5.
  • a uniform layer or bed 6 of chips is formed.
  • the band 3 travels with the bed 6 around a guide roller 8 on to a pressing roller 7 and wraps around the latter as far as a guide roller 9.
  • the band is held under tension by means which are not shown.
  • it is pressed by pressure rollers 10, l1, l2 and 13 against the pressing roller 7 in the wrapping region of the latter.
  • the band 3 is covered by a metal sheet 14, so that an air duct 15 is formed between the band 3 and the metal sheet 14.
  • the inlet and the outlet of the air duct 15 are connected to one another by a hollow pipe 16, to provide for recirculating the gases.
  • a fan 17 provides for a sufficiently high flow velocity, which guarantees a sufficient heat transfer between the band 3 and the gas.
  • the plate 14 and duct 16 are insulated by heating insulating means 17 and 18. The heat insulation 18 is only partly shown.
  • guide plates 19, 20 and 21 Arranged on the metal sheet 14 are guide plates 19, 20 and 21 which project into the interstices between the pressure rollers 10-11, 11-12 and 12-13 and direct the hot air and gas into these interstices towards the band 3.
  • a burner 22 Connected to the duck 16 upstream of the fan 17 is a burner 22, which delivers heat into the circulating system by means of its exhaust gas. Excess pressure in the circulating system is avoided by an excess pressure valve 23, through which the excess gases are vented.
  • Apparatus for the continuous manufacture of chipboards comprising an endless band consisting of steel,
  • 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.
  • Apparatus according to claim 2 characterized in that gas-directing plates are disposed to direct the gas.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Press Drives And Press Lines (AREA)

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.

Description

[ 1 May 22,1973
1541 APPARATUS FOR CONTINUOUS MANUFACTURE OF CHIPBOARD [75] Inventor: Hubert Ettel, Harz, Germany [73] Assignee: Wilhelm Mende & Co., Harz, Germany 22 Filed: Oct. 26, 1971 21 Appl.No.:192,373
[30] Foreign Application Priority Data 3,039,137 6/1962 Smith et al ..425/373 X 3,096,227 7/1963 Van Elten ..425/373 X 3,241,182 3/1966 Kessler ..425/373 X 3,400,196 9/1968 Le Roy ..425/373 X Primary Examiner-J. Howard Flint, Jr. Attorney-Molinare, Allegretti, Newitt & Witcoff 57 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.
7 Claims, 1 Drawing Figure PATENTED W22 3 734, 669
INVENTOR 1 /6/5573? ETTEL APPARATUS FOR CONTINUOUS MANUFACTURE OF CHIPBOARD The invention relates to an arrangement for the continuous manufacture of chipboards, comprising an endless band made of steel, on to which is scattered a layer of wood chips to which binders are added, the said band being under tension and running continuously over a pressing roller and wrapping partially around the latter.
PRIOR ART An arrangement for the continuous manufacture of chipboards has been proposed, in which an endless band partially wraps around a pressing roller and presses a heaped layer of wood chips against the said roller.
With this arrangement as proposed, difficulties arise in connection with the heating of the pressing roller for the final hardening of the chipboards. It is certainly true that the pressing roller itself can be cheaply and simply heated by steam under pressure, but the transfer of heat through the compressed layer of wood chips is very low, so that it can happen that temperatures which are too low can occur on the outside of the wrapping of material in the region of the band. Consequently, it is necessary for heat to be additionally supplied from outside. This cannot be effected with steam, because the necessary temperatures can only be produced with high steam pressures. These high steam pressures would make necessary a very complicated arrangement.
It would certainly be possible in principle to supply the heat from outside electrically, but this is very costly and disadvantageous, because it is difficult to provide for a uniform distribution of the heat supply to the band. If the heat supply is irregular, tensions are set up in the steel band, and these lead to impermissibly high loads on the band and more especially to distortions, which result in the layer or bed of wood chips being pressed on and compressed irregularly.
THE INVENTION The invention has for its object to provide an arrangement for the continuous manufacture of chipboards, with which the heat is supplied from outside towards the band and thus to the layer of wood chips in an economical and simple manner.
The object forming the basis of the invention is achieved by the band, in the region in which it wraps around the pressing roller, forming at least partially a part of an air duct through which hot air is flowing.
The hot air in the air stream can be simply supplied with the exhaust gas of a burner, more especially an oil burner. Heat can be cheaply produced by such a burner without the more involved method of electric current, which is expensive. Since the exhaust gas of the burner can be fed directly into the air duct, heat exchanges are also superfluous, which would be necessary if the hot air were heated by steam, for example, by heat exchange.
The heat transfer between the hot gases and the steel strip is relatively poor, but it can be substantially improved by high flow velocities and by additional guiding plates or plates producing a turbulent flow.
Relatively low pressures are sufficient for producing a sufficient flow velocity, so that the sealing of the flow duct around the steel band does not present any difficulties.
It is expedient for the air duct to be arranged to provide a circulation in the region of the wrapping position of the band, so that the discharging air and exhaust gas is recirculated into the entry side. In order to supply heat to the circulation system, a burner, more especially an oil burner, is connected to the duct and supplies heat by means of its exhaust gas. By continuously supplying this exhaust gas to the duct, the quan tity of the circulating gas increases. Consequently it is necessary to allow the excess gas to escape through an excess pressure valve. This excess pressure valve is most expediently arranged at a position in the circulation where the temperature is lowest. This position is usually just upstream of the connecting point for the burner, that is to say, downstream of the outlet point at the end of the wrapping of the band. It is obvious that all exposed parts of the duct are heat-insulated. The manufacture of the duct or the duct sections is possible in a quite simply manner from comparatively thin sheet metal, because the pressures being set up are low. The heat insulation also does not present any difficulties.
SPECIFIC EXAMPLE The invention is to be more fully explained by reference to a constructional example shown in the drawing which is an elevational view of the apparatus, partly in section.
By means of a dispersing or scattering machine 1, chips 2 mixed with a binder are scattered on a band 3, which travels continuously in the direction of an arrow 4 over a table 5. In this way, a uniform layer or bed 6 of chips is formed. The band 3 travels with the bed 6 around a guide roller 8 on to a pressing roller 7 and wraps around the latter as far as a guide roller 9. The band is held under tension by means which are not shown. In addition, it is pressed by pressure rollers 10, l1, l2 and 13 against the pressing roller 7 in the wrapping region of the latter.
In the wrapping region, the band 3 is covered by a metal sheet 14, so that an air duct 15 is formed between the band 3 and the metal sheet 14. The inlet and the outlet of the air duct 15 are connected to one another by a hollow pipe 16, to provide for recirculating the gases. A fan 17 provides for a sufficiently high flow velocity, which guarantees a sufficient heat transfer between the band 3 and the gas. The plate 14 and duct 16 are insulated by heating insulating means 17 and 18. The heat insulation 18 is only partly shown.
Arranged on the metal sheet 14 are guide plates 19, 20 and 21 which project into the interstices between the pressure rollers 10-11, 11-12 and 12-13 and direct the hot air and gas into these interstices towards the band 3.
Connected to the duck 16 upstream of the fan 17 is a burner 22, which delivers heat into the circulating system by means of its exhaust gas. Excess pressure in the circulating system is avoided by an excess pressure valve 23, through which the excess gases are vented.
What is'claimed is:
1. Apparatus for the continuous manufacture of chipboards, comprising an endless band consisting of steel,
band, in the region in which it wraps around the pressing roller, forms at least partially a duct through which hot gases are circulated.
2. 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.
3. Apparatus according to claim 1, characterized in that this gas duct constitutes a recirculating system.
4. Apparatus according to claim 2, characterized in that gas-directing plates are disposed to direct the gas.
towards the steel band.
the point at which the lowest temperatures occur.

Claims (7)

1. 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.
2. 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.
3. Apparatus according to claim 1, characterized in that this gas duct constitutes a recirculating system.
4. Apparatus according to claim 2, characterized in that gas-directing plates are disposed to direct the gas towards the steel band.
5. 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.
6. Apparatus according to claim 1, characterized in that the hot air is heated by the exhaust gases of a burner.
7. 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.
US00192373A 1970-10-30 1971-10-26 Apparatus for continuous manufacture of chipboard Expired - Lifetime US3734669A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2053351A DE2053351C3 (en) 1970-10-30 1970-10-30 Device for the production of an endless thin chipboard sheet

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US3734669A true US3734669A (en) 1973-05-22

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US (1) US3734669A (en)
AT (1) AT309787B (en)
BE (1) BE774597A (en)
BR (1) BR7107286D0 (en)
CA (1) CA924227A (en)
CH (1) CH524450A (en)
CS (1) CS153596B2 (en)
DE (1) DE2053351C3 (en)
ES (1) ES396889A1 (en)
FR (1) FR2111438A5 (en)
NL (1) NL7114762A (en)
NO (1) NO129445B (en)
RO (1) RO77052A (en)
SE (1) SE366248B (en)
SU (1) SU388394A3 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3832115A (en) * 1971-05-29 1974-08-27 Mende & Co W Apparatus for compressing chipboards
US3915612A (en) * 1973-02-22 1975-10-28 Berstorff Gmbh Masch Hermann Apparatus for the continuous manufacture of pressed panels for loose materials
US4946635A (en) * 1985-10-30 1990-08-07 Wilheim Mende Gmbh & Co. Method for the continuous production of chip, fiber-and similar boards
US5094308A (en) * 1989-04-25 1992-03-10 Firma Theodor Hymmen Method and device for heating pressure belt of a press
US5558016A (en) * 1987-06-15 1996-09-24 Firma Theodor Hymmen Arrangement for applying a surface pressure to workpieces driven by a pressing band
US5711972A (en) * 1994-05-13 1998-01-27 Sunds Defibrator Industries Ab Device for board manufacture
WO2014195445A1 (en) * 2013-06-07 2014-12-11 Dieffenbacher GmbH Maschinen- und Anlagenbau Press for producing boards of material and method for operating such a press

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1953704A (en) * 1930-06-02 1934-04-03 Erdmann Konrad Apparatus for manufacturing porous bodies from fibrous materials
US2526318A (en) * 1948-02-10 1950-10-17 Us Rubber Co Sheet finishing apparatus
US2812542A (en) * 1955-08-04 1957-11-12 American Biltrite Rubber Co Method and apparatus for relieving vulcanized belting of internal stresses
US2991824A (en) * 1957-08-29 1961-07-11 Celotex Corp Recessed end gypsum board and process of manufacture
US3039137A (en) * 1958-02-10 1962-06-19 American Biltrite Rubber Co Apparatus for forming plastic sheets
US3096227A (en) * 1958-06-04 1963-07-02 Gerrit Jan Van Elten Apparatus for producing fibrous building boards
US3241182A (en) * 1963-04-23 1966-03-22 Kessler Milton Apparatus for the production of heavily embossed, thick plastic mats
US3400196A (en) * 1964-06-30 1968-09-03 Union Carbide Corp Method for the permanent compression of a sheet of flexible polyurethane foam

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1953704A (en) * 1930-06-02 1934-04-03 Erdmann Konrad Apparatus for manufacturing porous bodies from fibrous materials
US2526318A (en) * 1948-02-10 1950-10-17 Us Rubber Co Sheet finishing apparatus
US2812542A (en) * 1955-08-04 1957-11-12 American Biltrite Rubber Co Method and apparatus for relieving vulcanized belting of internal stresses
US2991824A (en) * 1957-08-29 1961-07-11 Celotex Corp Recessed end gypsum board and process of manufacture
US3039137A (en) * 1958-02-10 1962-06-19 American Biltrite Rubber Co Apparatus for forming plastic sheets
US3096227A (en) * 1958-06-04 1963-07-02 Gerrit Jan Van Elten Apparatus for producing fibrous building boards
US3241182A (en) * 1963-04-23 1966-03-22 Kessler Milton Apparatus for the production of heavily embossed, thick plastic mats
US3400196A (en) * 1964-06-30 1968-09-03 Union Carbide Corp Method for the permanent compression of a sheet of flexible polyurethane foam

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3832115A (en) * 1971-05-29 1974-08-27 Mende & Co W Apparatus for compressing chipboards
US3915612A (en) * 1973-02-22 1975-10-28 Berstorff Gmbh Masch Hermann Apparatus for the continuous manufacture of pressed panels for loose materials
US4946635A (en) * 1985-10-30 1990-08-07 Wilheim Mende Gmbh & Co. Method for the continuous production of chip, fiber-and similar boards
US5558016A (en) * 1987-06-15 1996-09-24 Firma Theodor Hymmen Arrangement for applying a surface pressure to workpieces driven by a pressing band
US5713271A (en) * 1987-06-15 1998-02-03 Firma Theodor Hymmen Method of and arrangement for applying a surface pressure to workpieces driven by a pressing band
US5094308A (en) * 1989-04-25 1992-03-10 Firma Theodor Hymmen Method and device for heating pressure belt of a press
US5711972A (en) * 1994-05-13 1998-01-27 Sunds Defibrator Industries Ab Device for board manufacture
WO2014195445A1 (en) * 2013-06-07 2014-12-11 Dieffenbacher GmbH Maschinen- und Anlagenbau Press for producing boards of material and method for operating such a press

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Publication number Publication date
RO77052A (en) 1983-04-29
AT309787B (en) 1973-09-10
SE366248B (en) 1974-04-22
DE2053351B2 (en) 1974-04-04
SU388394A3 (en) 1973-06-22
ES396889A1 (en) 1974-06-16
CH524450A (en) 1972-06-30
DE2053351A1 (en) 1972-05-10
FR2111438A5 (en) 1972-06-02
CA924227A (en) 1973-04-10
CS153596B2 (en) 1974-02-25
BE774597A (en) 1972-02-14
DE2053351C3 (en) 1974-11-07
BR7107286D0 (en) 1973-05-17
NO129445B (en) 1974-04-16
NL7114762A (en) 1972-05-03

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