US3832115A - Apparatus for compressing chipboards - Google Patents

Apparatus for compressing chipboards Download PDF

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Publication number
US3832115A
US3832115A US00256108A US25610872A US3832115A US 3832115 A US3832115 A US 3832115A US 00256108 A US00256108 A US 00256108A US 25610872 A US25610872 A US 25610872A US 3832115 A US3832115 A US 3832115A
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US
United States
Prior art keywords
gap
chipboard
pressure
layer
heated
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
US00256108A
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English (en)
Inventor
H Ettel
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.)
Mende Wilhelm and Co
Original Assignee
Mende Wilhelm 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
Publication date
Application filed by Mende Wilhelm and Co filed Critical Mende Wilhelm and Co
Application granted granted Critical
Publication of US3832115A publication Critical patent/US3832115A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 invention relates to an apparatus for producing chipboard, in which a layer or bed of wood chips, to which binders are added, is scattered onto a steel band and the chips moved into a gap between two heated pressing components which compress the wood chip layer to produce the chipboard.
  • the spacer element always guarantee a constant spacing, the layer or bed of the'wood chips is held during the pressing operation at a constant thickness, until the curing of the binder has occurred. In this way, there is no springing back, or at most, only a very slight springing back, depending on'the elastic properties of the manufactured and cured chipboard.
  • An'object of this invention is to provide a simple arrangement for compressing chipboards, whereby it is possible to produce a smoother surface than with the previously known chipboards and, as far as possible, to
  • This object which forms the basis of this invention is achieved by maintaining the width of the gap between the two pressing components at the commencement of the pressing operation at a distance smaller than the thickness of the chipboard to be manufactured.
  • the inner portion of the chipboard will spring outwardly again, since curing in this portion has still not occurred.
  • the extent the inner portion springs out is determined by the continuing downstream compressive pressure or the width of the following pressure gap, when using a 'continuously operating arrangement, and by the thickness of the heaped layer of chips and the material properties of the chips.
  • the outward springing produces a smaller chip density in the central region of the board, where, as is known, the chips only contribute to a small degree to the strength of the chipboard.
  • the teaching of this invention can be achieved in a quite simple manner by adjusting the gap between two pressure cylinders to a distance smaller than the thickness of the chipboard which is to be manufactured. Following the pressing gap, the'pressure cylinder is wrapped or embraced by a steel band under tension, at a spaced apart distance corresponding to the thickness of the chipboard to be manufactured.
  • the pressure'cylinders can be mounted for movement relative to one another and can be pressed against one another in such a way that the required narrowing or undersize of the pressure gap is produced at the start of the pressing operation.
  • the pressing cylinders can also be fixedly mounted,
  • Chips 2 to which a binder is added are scattered by means of a scattering or broadcasting machine 1, on a band 3, which runs continuously in the direction of arrow 4 over a table 5. In this way, a constant layer or bed 6 of chips is formed.
  • This bed of chips travels on the band 3, which is preferably made of steel, into a gap 7 formed between a large heated pressure cylinder 8 and a small heated pressure cylinder 9.
  • the band 3 wraps around the major part of the pressure cylinder 8 following the gap 7 and then runs around a guide roller 10.
  • a gap 11 is formed between the cylinder and the band 3. This gap is filled by the compressed wood chips or, strictly speaking, the already partially cured chipboard.
  • the width of the gap 7 between the pressure cylinders 8 and 9 is smaller than the thickness of the chipboard which is to be manufactured.
  • the width of gap 7 is 3.8 mm when the thickness of the chipboard to be manufactured is 4.2 mm.
  • the width of the gap 11 is approximately the same as the thickness of the chipboard to be manufactured, i.e., about 4.2 mm.
  • the excessive compression in the narrowed gap 7 a particularly intimate thermal contact is produced between the surface of band 3 which rests on the heated pressure cylinder 9, the adjacent region of the layer 6, the surface of the heated pressure cylinder 8 and the opposite surface region of layer 6.
  • the curing in the region of the gap 7 occurs in at least the surface regions. This curing takes place with a high degree of compression in the gap 7, so that a high density is guaranteed in the surface region of the chipboard to be manufactured.
  • the'partially cured chipboard springs out again in the middle region of the board. This is because no curing or only a slight curing has occurred, and as a result, the middle region of the chipboard is no longer as strongly compressed. As a result, in regards to strength, the chipboard has a lower density in the less significant central region. Hence, wood is saved and a lower weight is produced.
  • the curing of the central region of the chipboard then occurs in the gap 11 between the band 3 and the pressing cylinder 8.
  • the pressing cylinder 9 is provided with bearings 12,- which are displaceably mounted on a guide 13 substantially in the direction towards the pressing cylinder 8.
  • the gap 7 between the pressure cylinders 8 and 9 is readily adjustable.
  • the adjustment of gap 7 can be made by appropriate establishment of a certain pressure on the bearing 12 in the direction of the pressure cylinder 8.
  • the width of the gap 7 also depends on the thickness of the layer 6. Layer 6, however, can very easily be kept constant, so that a constant width in the gap 7 is produced.
  • an apparatus for producing chipboard from a layer of wood chips and binders, said chipboard having a predetermined thickness said apparatus including a first and second heated pressure member and a steel band, said steel band carrying said layer between said first and second heated pressure members, the improvement comprising means for producing high chip density outer regions and a low chip density intermediate region in said chipboard, said producing means including means for positioning said first heated pressure member relative to said second heated pressure member to initially compress said layer to a thickness less than said predetermined thickness.
  • first heated pressure member is a first pressure cylinder and'said second heated pressure member is a second pressure cylinder, said first and second pressure cylinders defining a gap therebetween, said gap being less than said predetermined thickness.

Landscapes

  • 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)
  • Butt Welding And Welding Of Specific Article (AREA)
US00256108A 1971-05-29 1972-05-23 Apparatus for compressing chipboards Expired - Lifetime US3832115A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2126935A DE2126935C3 (de) 1971-05-29 1971-05-29 Preßverfahren zur Herstellung unge schhffener Spanplatten sowie Einrichtung zur Durchfuhrung des Preßverfahrens

Publications (1)

Publication Number Publication Date
US3832115A true US3832115A (en) 1974-08-27

Family

ID=5809384

Family Applications (1)

Application Number Title Priority Date Filing Date
US00256108A Expired - Lifetime US3832115A (en) 1971-05-29 1972-05-23 Apparatus for compressing chipboards

Country Status (22)

Country Link
US (1) US3832115A (fr)
BE (1) BE783848A (fr)
BG (1) BG18833A3 (fr)
BR (1) BR7203406D0 (fr)
CA (1) CA985999A (fr)
CH (1) CH535649A (fr)
CS (1) CS156542B2 (fr)
DD (1) DD101331A5 (fr)
DE (1) DE2126935C3 (fr)
DK (1) DK130677B (fr)
ES (1) ES400996A1 (fr)
FR (1) FR2139811B1 (fr)
GB (1) GB1390454A (fr)
IL (1) IL39498A (fr)
IT (1) IT955927B (fr)
NL (1) NL7207019A (fr)
NO (1) NO135236C (fr)
RO (1) RO89568A (fr)
SE (1) SE392066B (fr)
SU (1) SU436474A3 (fr)
TR (1) TR17525A (fr)
ZA (1) ZA723555B (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938927A (en) * 1974-04-25 1976-02-17 Hermann Berstorff Maschinenbau Gmbh Apparatus for the continuous manufacture of chipboard panels, fibre panels or the like
US4011034A (en) * 1972-07-08 1977-03-08 Karl Kroyer St. Anne's Limited Production of fibrous sheet material
US4784816A (en) * 1984-08-13 1988-11-15 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Method for continuous manufacture of inorganically bonded materials, especially material slabs
US4882114A (en) * 1984-01-06 1989-11-21 The Wiggins Teape Group Limited Molding of fiber reinforced plastic articles
US4957805A (en) * 1986-07-31 1990-09-18 The Wiggins Teape Group Limited Method of making laminated reinforced thermoplastic sheets and articles made therefrom
US4964935A (en) * 1986-07-31 1990-10-23 The Wiggins Teape Group Limited Method of making fibre reinforced thermoplastics material structure
US4978489A (en) * 1986-07-31 1990-12-18 The Wiggins Teape Group Limited Process for the manufacture of a permeable sheet-like fibrous structure
US4981636A (en) * 1987-03-13 1991-01-01 The Wiggins Teape Group Limited Fibre reinforced plastics structures
US5053449A (en) * 1988-08-03 1991-10-01 The Wiggins Teape Group Limited Plastics material
US5215627A (en) * 1986-07-31 1993-06-01 The Wiggins Teape Group Limited Method of making a water laid fibrous web containing one or more fine powders
US5242749A (en) * 1987-03-13 1993-09-07 The Wiggins Teape Group Limited Fibre reinforced plastics structures

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2722356C2 (de) * 1977-05-17 1982-07-29 Bison-Werke Bähre & Greten GmbH & Co KG, 3257 Springe Verfahren und Vorrichtung zum kontinuierlichen Herstellen von Span-, Faser- o.dgl. Platten
DE3538531A1 (de) * 1985-10-30 1987-05-07 Mende & Co W Verfahren zur kontinuierlichen herstellung von span-, faser- und dergleichen -platten
DE3734180C2 (de) * 1987-10-09 1998-01-29 Kuesters Eduard Maschf Doppelbandpresse zur Herstellung von Holzspanplatten und dergleichen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216059A (en) * 1961-09-29 1965-11-09 Voelskow Peter Apparatus for producing fiberboard sheets
US3278659A (en) * 1963-02-26 1966-10-11 Specialty Converters Method and apparatus for casting foam plastic sheets on a curved casting surface
US3309444A (en) * 1962-06-07 1967-03-14 Schueler George Berthol Edward Method of producing particle board
US3391233A (en) * 1967-01-16 1968-07-02 Polovtseff Boris Manufacture of particle board
US3632734A (en) * 1969-07-28 1972-01-04 Univ Minnesota Reduction of springback in particle-board by resin treatment of green particles
US3734669A (en) * 1970-10-30 1973-05-22 Mende & Co W Apparatus for continuous manufacture of chipboard

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3216059A (en) * 1961-09-29 1965-11-09 Voelskow Peter Apparatus for producing fiberboard sheets
US3309444A (en) * 1962-06-07 1967-03-14 Schueler George Berthol Edward Method of producing particle board
US3278659A (en) * 1963-02-26 1966-10-11 Specialty Converters Method and apparatus for casting foam plastic sheets on a curved casting surface
US3391233A (en) * 1967-01-16 1968-07-02 Polovtseff Boris Manufacture of particle board
US3632734A (en) * 1969-07-28 1972-01-04 Univ Minnesota Reduction of springback in particle-board by resin treatment of green particles
US3734669A (en) * 1970-10-30 1973-05-22 Mende & Co W Apparatus for continuous manufacture of chipboard

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4011034A (en) * 1972-07-08 1977-03-08 Karl Kroyer St. Anne's Limited Production of fibrous sheet material
US3938927A (en) * 1974-04-25 1976-02-17 Hermann Berstorff Maschinenbau Gmbh Apparatus for the continuous manufacture of chipboard panels, fibre panels or the like
US4882114A (en) * 1984-01-06 1989-11-21 The Wiggins Teape Group Limited Molding of fiber reinforced plastic articles
US4784816A (en) * 1984-08-13 1988-11-15 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Method for continuous manufacture of inorganically bonded materials, especially material slabs
US4978489A (en) * 1986-07-31 1990-12-18 The Wiggins Teape Group Limited Process for the manufacture of a permeable sheet-like fibrous structure
US4964935A (en) * 1986-07-31 1990-10-23 The Wiggins Teape Group Limited Method of making fibre reinforced thermoplastics material structure
US4957805A (en) * 1986-07-31 1990-09-18 The Wiggins Teape Group Limited Method of making laminated reinforced thermoplastic sheets and articles made therefrom
US5215627A (en) * 1986-07-31 1993-06-01 The Wiggins Teape Group Limited Method of making a water laid fibrous web containing one or more fine powders
US5558931A (en) * 1986-07-31 1996-09-24 The Wiggins Teape Group Limited Fibre reinforced thermoplastics material structure
US5639324A (en) * 1986-07-31 1997-06-17 The Wiggins Teape Group Limited Method of making laminated reinforced thermoplastic sheets and articles made therefrom
US4981636A (en) * 1987-03-13 1991-01-01 The Wiggins Teape Group Limited Fibre reinforced plastics structures
US5242749A (en) * 1987-03-13 1993-09-07 The Wiggins Teape Group Limited Fibre reinforced plastics structures
US5053449A (en) * 1988-08-03 1991-10-01 The Wiggins Teape Group Limited Plastics material

Also Published As

Publication number Publication date
IT955927B (it) 1973-09-29
FR2139811B1 (fr) 1973-07-13
CH535649A (de) 1973-04-15
CA985999A (en) 1976-03-23
IL39498A (en) 1974-06-30
BR7203406D0 (pt) 1973-05-17
SU436474A3 (ru) 1974-07-15
NO135236B (fr) 1976-11-29
DK130677C (fr) 1975-09-01
NL7207019A (fr) 1972-12-01
NO135236C (fr) 1977-03-09
ES400996A1 (es) 1975-02-01
DD101331A5 (fr) 1973-11-05
DE2126935A1 (de) 1972-11-30
IL39498A0 (en) 1972-07-26
TR17525A (tr) 1975-07-23
GB1390454A (en) 1975-04-16
DE2126935B2 (de) 1973-05-03
BE783848A (fr) 1972-09-18
BG18833A3 (fr) 1975-03-20
DE2126935C3 (de) 1973-11-22
RO89568A (fr) 1986-06-30
DK130677B (da) 1975-03-24
FR2139811A1 (fr) 1973-01-12
CS156542B2 (fr) 1974-07-24
SE392066B (sv) 1977-03-14
ZA723555B (en) 1973-03-28

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