US3552306A - Multilayer press for production of sheets or boards of fibrous material - Google Patents

Multilayer press for production of sheets or boards of fibrous material Download PDF

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Publication number
US3552306A
US3552306A US737894A US3552306DA US3552306A US 3552306 A US3552306 A US 3552306A US 737894 A US737894 A US 737894A US 3552306D A US3552306D A US 3552306DA US 3552306 A US3552306 A US 3552306A
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US
United States
Prior art keywords
press
plates
plate
sheet plate
surface sheet
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
US737894A
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English (en)
Inventor
Rolf Bertil Reinhall
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.)
Valmet AB
Original Assignee
Defibrator AB
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 Defibrator AB filed Critical Defibrator AB
Application granted granted Critical
Publication of US3552306A publication Critical patent/US3552306A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/062—Press plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B7/00—Presses characterised by a particular arrangement of the pressing members
    • B30B7/02—Presses characterised by a particular arrangement of the pressing members having several platens arranged one above the other

Definitions

  • this invention relates to multilayer presses for manufacture of sheets or boards of fibrous materials such as wood fibers, which presses are equipped with a plurality of superimposed, horizontally extending press plates which are displaceable relatively to one another in a vertical direction from a position in which they are separated by an air gap or interspace (daylight opening), to a position in which sheet or board blanks fed between them are subjected to pressure and heat between the plates, the upper of the pair of plates defining an interspace carrying a surface sheet plate on its lower face.
  • Such surface sheet plates or, as some types thereof are called, glazing plates" have as their purpose to impart to the manufactured product some desired surface property such as a glazingor a satin' dull surface.
  • the sheet plates can be acidproof or chromium-finished.
  • the surface sheet plate In the hot press the surface sheet plate is fixed on the upper of two coacting press plates so that it, when the press is closed comes into contact with the upper face of the board blank.
  • the presses must be made with substantially wider daylight openingsbetween the press plates than corresponds to the thickness of the board blanks in order to render possible to introduce them between the press plates. This results in increased costs.
  • One main object of the invention is to eliminate the sagging of the surface sheet plates in multilayer presses of the type in consideration.
  • the surface sheet plate is made of two coherent layers of which the layer nearest to the press plate has a greater coefficient of thermal expansion than the more remote layer.
  • FIG. I is a diagrammatic lateral view of two press plates forming part of a multilayer press and of which the upper one has a surface sheet plate made according to a known construction.
  • FIG. 2 is a similar view of an embodiment with a surface sheet plate made in accordance with the invention.
  • FIG. 3 is a similar view of an embodiment with a surface sheet plate made in accordance with the invention.
  • a multilayer press has a great number of superimpose press plates of which two plates 10, 12 are shown in the drawpositioned on the lower of a pair of press plates defining a daylight opening.
  • Rigidly secured tothe lower face of each upper press plate 10 in a layer is a surface sheet plate 14 by -means of members 16 mounted outside the active portion of the longish press plate 10 and preferably at the short sides of said plates.
  • the sheet plate 14 is caused by its own weight to sag and thereby to reduce the height of the daylight opening between the press plates 10 and 12 when the press is open.
  • the surface sheet plate has for its purpose to impart tothe upper surface of the fiber board some desired property.
  • the surface sheet plates are made of two la ers of metal according to the compound principle.
  • the upper one denoted 18 which thus is located nearest to the press plate 10 is made of a material having a higher coefficient of heat expansion than the lower layer 20.
  • the upper layer may be thinner than the lower one, although this is not a condition.
  • a surface sheet plate constructed in the described manner will, as will be seen from FIG. 2, maintain itsplane shape which results in that the daylight opening can be given minor width and the multilayer press will obtain as a unit substantially minor dimensions in the vertical direction.
  • the layer l 8 in the compounded sheet plate which is located nearest to the 'press plate will be given a higher temperature than the lower layer 20 more remote from the press plate 10 when the press is open to receive a fresh charge of blanks. Due to the composition of the sheet plate according to the invention the upper layer 18 will expand more than the lower layer 20. In this way sufficient forces are created in the surface sheet plate to prevent it from sagging. It is evident that the invention also can be assumed to start from the bimetal effect.
  • composition of material of which the surface sheet plate is made can be varied in response to the demands on surface structure and capacity of resistance to chemical attacks.
  • the thickness of the two layers in the sheet plate relative one another is varied in response to the strength of the components and their capacity of resistance to compression and tensile stresses. The softer the metal is the thicker the layer must be made.
  • An example of a suitable composition of the layers is copper for the upper layer 18 and acid-proof steel for the lower layer 20.
  • a multilayer press for production of sheets or boards of fibrous'materials such as wood fibers, and equipped with a plurality of superimposed horizontal press plates displaceable relatively to one another in a vertical direction from a position in which they are separated by an air interspace into a position in which sheet or board blanks introduced between them are subjected to pressure and heat between said plates, the upper of a pair of plates defining an interspace carrying a surface sheet plate on its lower face, the improvement that the surface sheet plate is made of two coherent layers of which the layer located nearest to the upperpress platehas a greater coefficient of heat expansion than the more remote layer so that a sagging of the sheet plate due toits own weight is effectively counteracted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Press Drives And Press Lines (AREA)
US737894A 1967-06-26 1968-06-18 Multilayer press for production of sheets or boards of fibrous material Expired - Lifetime US3552306A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE09181/67*A SE337324B (enrdf_load_stackoverflow) 1967-06-26 1967-06-26

Publications (1)

Publication Number Publication Date
US3552306A true US3552306A (en) 1971-01-05

Family

ID=20276052

Family Applications (1)

Application Number Title Priority Date Filing Date
US737894A Expired - Lifetime US3552306A (en) 1967-06-26 1968-06-18 Multilayer press for production of sheets or boards of fibrous material

Country Status (5)

Country Link
US (1) US3552306A (enrdf_load_stackoverflow)
DE (1) DE1703609C3 (enrdf_load_stackoverflow)
FR (1) FR1571120A (enrdf_load_stackoverflow)
GB (1) GB1221563A (enrdf_load_stackoverflow)
SE (1) SE337324B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888719A (en) * 1973-04-10 1975-06-10 Seal Adjustable vacuum press

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1996500A (en) * 1933-07-28 1935-04-02 Jr James L Adams Rolling-mill roll
US3106153A (en) * 1961-03-09 1963-10-08 Beloit Iron Works Controllable deflection roll
US3143012A (en) * 1960-12-21 1964-08-04 Loire Atel Forges Hooped assembly
US3241189A (en) * 1961-06-29 1966-03-22 Siempelkamp Eugen Temperature-controlled press
US3416435A (en) * 1966-06-13 1968-12-17 Beloit Corp Roller press

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1996500A (en) * 1933-07-28 1935-04-02 Jr James L Adams Rolling-mill roll
US3143012A (en) * 1960-12-21 1964-08-04 Loire Atel Forges Hooped assembly
US3106153A (en) * 1961-03-09 1963-10-08 Beloit Iron Works Controllable deflection roll
US3241189A (en) * 1961-06-29 1966-03-22 Siempelkamp Eugen Temperature-controlled press
US3416435A (en) * 1966-06-13 1968-12-17 Beloit Corp Roller press

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888719A (en) * 1973-04-10 1975-06-10 Seal Adjustable vacuum press

Also Published As

Publication number Publication date
SE337324B (enrdf_load_stackoverflow) 1971-08-02
GB1221563A (en) 1971-02-03
DE1703609B2 (de) 1973-08-09
DE1703609A1 (de) 1972-02-17
FR1571120A (enrdf_load_stackoverflow) 1969-06-13
DE1703609C3 (de) 1974-02-28

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