US3686383A - Method for hot-pressing sheets of substances containing lignocellulose - Google Patents

Method for hot-pressing sheets of substances containing lignocellulose Download PDF

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Publication number
US3686383A
US3686383A US877687A US3686383DA US3686383A US 3686383 A US3686383 A US 3686383A US 877687 A US877687 A US 877687A US 3686383D A US3686383D A US 3686383DA US 3686383 A US3686383 A US 3686383A
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US
United States
Prior art keywords
press
pressure
blank
board
hot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US877687A
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English (en)
Inventor
Alpo Eino Makinen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Insinooritoimisto Alpo Makinen and Co
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Insinooritoimisto Alpo Makinen and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Insinooritoimisto Alpo Makinen and Co filed Critical Insinooritoimisto Alpo Makinen and Co
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Publication of US3686383A publication Critical patent/US3686383A/en
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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
    • B27N3/20—Moulding or pressing characterised by using platen-presses
    • B27N3/203—Moulding or pressing characterised by using platen-presses with heating or cooling means
    • 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
    • B27N3/086—Presses with means for extracting or introducing gases or liquids in the mat

Definitions

  • the blank is sub- Jected to heat and pressure and steam lS withdrawn in Nov. 18,1968 Finland ..3296/68 an initial pressing stage Then the press gap i closed and the spent cellulose liquor gasifies in the en- 164/120 264/ closed space, causing an increase in temperature and v [58] Fieid g 83 pressure, aiding in the rapid formation of a board. After the pressure has reached'a desired level the pressure is controlled by venting any excess gas.
  • the [56] References Cited pressing is done in one press and treatment time is NI STATES PATENTS greatly reduced in comparison with prior processes.
  • This invention relates generally to a method for hotpressing sheets of substances containing lignocellulose, such as fiber boards or chipboards.
  • pressure and temperature are important factors in the utilization of said reactions, and they also have a mutual relationship.
  • the pressure applied in hot presses is primarily intended to produce mutual contact between fibers and fiber groups and between chips in order that compactness of the board product might be achieved.
  • Endeavors have also been made to utilize the gas pressure of the gases which occur, by making the space between plates in the press gas-tight, and this has been accomplished by compressing the near-marginal portion of the fiber board blank with such great force that this portion serves as seal.
  • the gas pressure has then been controlled by changing the press force, whereby gases may be allowed to escape by reducing this force or pressure.
  • a method for hotpressing substances containing lignocellulose wherein the gases produced in the course of pressing and the gases introduced from the outside are utilized and various treatment phases are carried out in one stage, in which connection the gas pressure can be regulated by simple means, comprises the steps of pressing and heating the sheet blank in an enclosed pressing space where there is controllably maintained a desired gas atmosphere either by means of the gases produced in the sheet or with the aid of gases conducted from the outside into the pressing chamber.
  • a device used for embodying said method has a connection with the press plates of the press gap or of each press gap, respectively, a gasket encircling the whole press gap and which has been arranged to seal the press gap when the press is closed, a conduit provided with a regulating member being lead into the part of the press gap between the 2 margin of the sheet blank placed in the press and said gasket element.
  • Said gasket is advantageously fixed to the edge of the upper press plate, while the conduit is mounted in connection with the lower press plate.
  • the gasket consists of a moulding having the cross section of a letter U lying on its side and the open side of which is outwardly directed, and which has been attached by means of a supporting element fixed to the press plate and projecting into the gasket.
  • conduits from each press gap are advantageously connected to a common header.
  • a press according to the invention may also be provided with an auxiliary device placed in the press gap, and in itself belonging to previous art, for conducting the gases and vapors generated in the sheet blank from the central part of this blank into the space between its margins and said gasket.
  • the reference numerals l and 2 indicate the press plates, of which the plate 1 is movable and the plate 2 is stationary, and which can be pressed against each other, for instance hydraulically, as has been schematically indicated by arrows.
  • a gasket 3 which seals the press gap hermetically when the plates 1 and 2 are pressed against the sheet blank.
  • the gasket 3 has been made of an elastically deformable material which tolerates the temperatures that come into use, and it comprises a sealing moulding having the cross section of a letter U lying on its side and running around the entire periphery of the press gap.
  • the gasket 3 has been fixed by means of a supporting member 4 projecting into the gasket and which in its turn has been attached to the edge of the press plate 1.
  • the supporting member 4 may be continuous or it may consist of sections placed at a given spacing. Since the gasket 3 has been attached to the upper plate 1, it follows along with this plate when the press gap is opened, whereby it is possible to place the sheet blank into the press gap and to remove from it the pressed board without interference from the gasket.
  • a chip board blank 6 has been shown between the press plates 1 and 2.
  • an auxiliary device previously known in itself, for the purpose of facilitating the escape of gases and vapors from the central part of the sheet blank, namely, a wire 7 placed between the sheet blank and the press plate.
  • This auxiliary device may equally be a combination of a perforated plate and wire, in which instancethe perforated plate is turned against the sheet blank, and it may be used on either side of the sheet blank although in the drawing it has only been shown on top of the sheet blank.
  • this space connects with the ambient atmosphere or with a header line or tank (the latter elements are not shown in the drawing but their function and structure are well known to those familiar with the art).
  • blanks are formed, which are pressed in a hot press according to the invention at a temperature which is higher than. 165 C. and with a pressure which is in excess of kp/cm in the press gap, which has been so closed outside the edges of the blank that the pressure of the gas entrapped in the press gap is uniformly distributed in the blank and that gas may be conducted through a valve away from the blank and in this manner adjustment of the acting gas pressure within desired limits is possible.
  • gases which are useful in the process may be introduced into this system from outside the press through the aforementioned valve.
  • the blank is pressed in the hot press with 35 kp/cm pressure, at the temperature of 200 C.
  • the press time is about 18 minutes.
  • the press autoclave is here understood to be the autoclave which is formed when the press is closed and the press gap becomes a space which is enclosed at least in certain degree, and in which space the amount of gas and its pressure may be controlled according to the invention with the aid of a valve.
  • the pressure in the press autoclave begins to increase.
  • the gas pressure in the press autoclave increases in l 1 minutes to 10 kp/cm
  • the board is kept for another 9 minutes under the said pressure of 10 kp/cm in order that the board might attain the desired properties.
  • This kind of board has good transversal tensile strength, compared to traditional chipboard.
  • the autoclave period is only 20 minutes.
  • the method according to the present invention has proved to. be particularly advantageous when board products are made from timber barking residue and spent sulphite liquor.
  • the product thus obtained has presented moisture tolerance properties superior to those of boards manufactured with bonding agents belonging to previous art.
  • a method of forming boards comprising:

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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)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
US877687A 1968-11-18 1969-11-17 Method for hot-pressing sheets of substances containing lignocellulose Expired - Lifetime US3686383A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI329668 1968-11-18

Publications (1)

Publication Number Publication Date
US3686383A true US3686383A (en) 1972-08-22

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ID=8508252

Family Applications (1)

Application Number Title Priority Date Filing Date
US877687A Expired - Lifetime US3686383A (en) 1968-11-18 1969-11-17 Method for hot-pressing sheets of substances containing lignocellulose

Country Status (12)

Country Link
US (1) US3686383A (da)
AT (1) AT298770B (da)
BE (1) BE741839A (da)
CH (1) CH515116A (da)
DE (1) DE1957604A1 (da)
DK (1) DK128992B (da)
ES (1) ES373607A1 (da)
FR (1) FR2023547A1 (da)
GB (1) GB1275445A (da)
IT (1) IT974523B (da)
NL (1) NL6917250A (da)
NO (1) NO137932C (da)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104101A (en) * 1972-08-11 1978-08-01 Armen Garabedian Process for making a plastic sheet
US4235836A (en) * 1978-01-31 1980-11-25 United Kingdom Atomic Energy Authority Method for making thermal insulating, fire resistant material
US4243368A (en) * 1978-07-31 1981-01-06 Armen Garabedian Apparatus for making a stress-free plastic article
US4350545A (en) * 1979-10-12 1982-09-21 Armen Garabedian Method of laminating plastic sheets
EP0063404A1 (en) * 1981-04-14 1982-10-27 Carbocol Inc. Steam bonding of solid lignocellulosic material
US4409170A (en) * 1981-12-31 1983-10-11 John Jansky Production of composite products by consolidation using pressure and convection heating
US4623499A (en) * 1983-02-28 1986-11-18 Nihon Sekiso Kogyo Co., Ltd. Method for manufacture of shaped article of organic substance
US6083437A (en) * 1996-07-22 2000-07-04 Eidai Co., Ltd. Method for dimensional stabilizing treatment of wood and wood composite
US6103180A (en) * 1993-10-06 2000-08-15 Matec Holding Ag Method for producing a low odor, sound- and heat-insulation shaped element
US6132656A (en) * 1998-09-16 2000-10-17 Masonite Corporation Consolidated cellulosic product, apparatus and steam injection methods of making the same
US20050011621A1 (en) * 2001-11-01 2005-01-20 Ulla Westermark Lignocellulose product
EP2045058A1 (en) * 2007-10-03 2009-04-08 Wiri B.V. Arrangement for producing a composite slab.
CN106064420A (zh) * 2016-06-16 2016-11-02 宁波大世界集团有限公司 一种保压排气装置
US20230044042A1 (en) * 2021-08-04 2023-02-09 Hyundai Mobis Co., Ltd. Wood preforming device for manufacturing crash pad for vehicle including real wood sheet

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0611638B1 (en) * 1993-02-18 1999-07-28 Eidai Co. Ltd. Process for stabilizing lignocellulosic material and device therefor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622276A (en) * 1948-07-24 1952-12-23 Winfred E Wilson Process for manufacturing composite board
GB993693A (en) * 1962-01-23 1965-06-02 Dansk Spaanplade Kompagni As Improvements in and relating to the manufacture of chipboard or the like

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622276A (en) * 1948-07-24 1952-12-23 Winfred E Wilson Process for manufacturing composite board
GB993693A (en) * 1962-01-23 1965-06-02 Dansk Spaanplade Kompagni As Improvements in and relating to the manufacture of chipboard or the like

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104101A (en) * 1972-08-11 1978-08-01 Armen Garabedian Process for making a plastic sheet
US4235836A (en) * 1978-01-31 1980-11-25 United Kingdom Atomic Energy Authority Method for making thermal insulating, fire resistant material
US4243368A (en) * 1978-07-31 1981-01-06 Armen Garabedian Apparatus for making a stress-free plastic article
US4350545A (en) * 1979-10-12 1982-09-21 Armen Garabedian Method of laminating plastic sheets
EP0063404A1 (en) * 1981-04-14 1982-10-27 Carbocol Inc. Steam bonding of solid lignocellulosic material
US4357194A (en) * 1981-04-14 1982-11-02 John Stofko Steam bonding of solid lignocellulosic material
US4409170A (en) * 1981-12-31 1983-10-11 John Jansky Production of composite products by consolidation using pressure and convection heating
US4623499A (en) * 1983-02-28 1986-11-18 Nihon Sekiso Kogyo Co., Ltd. Method for manufacture of shaped article of organic substance
US6103180A (en) * 1993-10-06 2000-08-15 Matec Holding Ag Method for producing a low odor, sound- and heat-insulation shaped element
US6083437A (en) * 1996-07-22 2000-07-04 Eidai Co., Ltd. Method for dimensional stabilizing treatment of wood and wood composite
US6132656A (en) * 1998-09-16 2000-10-17 Masonite Corporation Consolidated cellulosic product, apparatus and steam injection methods of making the same
US20050011621A1 (en) * 2001-11-01 2005-01-20 Ulla Westermark Lignocellulose product
US7326317B2 (en) * 2001-11-01 2008-02-05 Ulla Westermark Lignocellulose product
EP2045058A1 (en) * 2007-10-03 2009-04-08 Wiri B.V. Arrangement for producing a composite slab.
CN106064420A (zh) * 2016-06-16 2016-11-02 宁波大世界集团有限公司 一种保压排气装置
US20230044042A1 (en) * 2021-08-04 2023-02-09 Hyundai Mobis Co., Ltd. Wood preforming device for manufacturing crash pad for vehicle including real wood sheet
US12011847B2 (en) * 2021-08-04 2024-06-18 Hyundai Mobis Co., Ltd. Wood preforming device for manufacturing crash pad for vehicle including real wood sheet

Also Published As

Publication number Publication date
IT974523B (it) 1974-07-10
NO137932C (no) 1978-05-24
GB1275445A (en) 1972-05-24
NO137932B (no) 1978-02-13
DK128992B (da) 1974-08-05
AT298770B (de) 1972-05-25
NL6917250A (da) 1970-05-20
CH515116A (de) 1971-11-15
FR2023547A1 (da) 1970-08-21
ES373607A1 (es) 1972-08-01
BE741839A (da) 1970-05-04
DE1957604A1 (de) 1970-06-11

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