US3688688A - Continuous action board press - Google Patents

Continuous action board press Download PDF

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Publication number
US3688688A
US3688688A US138258A US3688688DA US3688688A US 3688688 A US3688688 A US 3688688A US 138258 A US138258 A US 138258A US 3688688D A US3688688D A US 3688688DA US 3688688 A US3688688 A US 3688688A
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US
United States
Prior art keywords
press
pressure chamber
pressure
boards
press roll
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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
US138258A
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English (en)
Inventor
Into Isak Kerttula
Per Arno Jaatinen
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Individual
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Individual
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Publication of US3688688A publication Critical patent/US3688688A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D3/00—Veneer presses; Press plates; Plywood presses
    • B27D3/04—Veneer presses; Press plates; Plywood presses with endless arrangement of moving press plates, belts, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
    • B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
    • B30B5/062—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band urged by directly-acting fluid pressure

Definitions

  • a board press is here understood to be a press which may be employed for pressing boards, such as [21] Appl' 138,258 plywood, chip, fiber and other boards, for' laminating g various kinds of boards, for providing any kinds of [30 p A fi p i -i Data boards With a surfacing layer, etc. In all these in- 1 p ty stances the boards have to be subjected to pressure. 30, "1232 The may in the fon'n of a long web or in the form of'shorter pieces, which are consecutively fed [52 US. Cl. "100/154, 100/93 P, 115566759872, into the press I 51] rm. c1.
  • Cited continuous action press in which press belts and a pressure medium are used, has the drawback that the UNITED STATES PATENTS press roll and the initial end of the pressure chamber are spaced with reference to each other by a given 3:23: distance.
  • the board material to be pressed which has 3'340795 9/1967 Hartley:II IIII II 100/154 been mpressed by P'ess Primary Examiner-Peter Feldman Attorney-Waters, Roditi, Schwartz & Nissen 57] ABSTRACT thickness or to a fraction thereof, tends as a result of its elasticity to return to its original thickness before it enters the pressure chamber.
  • ABSTRACT thickness tends as a result of its elasticity to return to its original thickness before it enters the pressure chamber.
  • the board material compels the press belt to make a bend between the press roll and the initial end of the pressure chamber. The point of steepest bending is located at the front wall of the pressure chamber. This bend,
  • the aim of the present invention is to accomplish a continuous action board press which is free of the drawbacks mentioned above.
  • the invention is mainly characterized in that the press roll constitutes the front wall of the pressure chamber and that the surfaces confining the pressure chamber have been sealed against the press roll.
  • the pressure acting upon the belt and thus also upon the board material to be pressed begins as a pressure produced by the press roll and continues immediately as a pressure generated by the pressure chamber.
  • the pressure produced by the press roll has to be comparatively high in order that the pressure prevailing in the pressure chamber might not be able to discharge through the gap between the press roll and the press belt.
  • the pressure produced by the press roll is most appropriately equal to or some what higher than the pressure generated by the pressure chamber.
  • a press belt or press belts are not needed at all, especially if the board material to be pressed possesses sufficient rigidity and coherence already before the pressing process. It should be noted that one of the tasks of the belt is to guide the board material to be pressed into the pressure chamber. In a press according to the invention this guidance is furnished by the press roll.
  • FIG. 1 shows a board press according to one embodiment, in longitudinal section
  • FIG. 2 shows the section along line II-II in FIG. 1,
  • FIG. 3 corresponds to FIG. 2 and shows another embodiment
  • FIG. 4 corresponds to FIG. 1 and shows another embodiment
  • FIG. 5 shows the section along line V-V in FIG. 4.
  • the press consists of two endless belts l, which between them define the press gap.
  • the belts which may consist e.g., of steel, pass over press rolls 2 and 3.
  • the rolls on the right in FIG. 1, 3, are rolls providing traction.
  • the board material to be pressed consists in the case depicted in the figure, of veneers 4, which are fed into the press gap between the belts 1, whence they emerge as a finished, pressed sheet of plywood, 5.
  • Pressing takes place at first by means of the press rolls 2, which compress the board material 4 to its final thickness. Immediately thereafter the press belts 1 and the board material enclosed between them come under pressure of the medium, such as air, in the pressure chambers 6.
  • both pressure chambers 6 the front wall is formed by the press roll 2.
  • the roof 7 of the pressure chamber has been scaled against the press roll 2 by a seal 8 parallel to the lateral line of the roll.
  • the front ends of the side walls 9 of pressure chamber 6 have been sealed against the end faces of roll 2 by seals 10.
  • the lower edges of the side walls of pressure chamber 6 have been sealed against the belts 1 by seals 14.
  • action of the pressure medium begins already at the vertical centerline of the press roll 2.
  • the pressure chamber 6 terminates in an end wall 11.
  • the plywood 5 has already become stabilized at this stage to such extent that there is no longer any risk that the press belt 1 would form a bulge at the point between the end wall 11 and the roll 3. But if such risk is present, the possibility exists to design the ultimate end of the pressure chamber 6 to be similar to its initial end.
  • the embodiment according to FIG. 3 differs from the foregoing in that the side walls of the pressure chamber have been sealed by seals 12 entering grooves 13 in the roll 2, which are parallel to the circumferenc of the roll and are located close to its ends.
  • the moving surfaces defining the press gap need not be mutually identical.
  • a pressure chamber is not indispensable because the lower side merely constitutes a backing for the pressure produced by the top-side pressure chamber 6.
  • This backing may consist of a moving surface formed in any one of a plurality of difierent ways.
  • the press may be designed to be such that one and the same pressure chamber extends both over and under the press gap.
  • the board materialto be pressed, 4 travels in a press gap defined on top and below by press belts 1 and on the sides by endless sealing belts l5 travelling along with the press belts.
  • Both ends of the pressure chamber have been sealed with a seal having parts 8 parallel to the lateral line of rolls 2 and 3, parts 10 touching the ends of the rolls, parts 16 encircling the endless sealing belts 15, etc.
  • the pressure chamber is thereby sealed in such manner that the pressure medium cannot escape and cannot bleed into the press gap between the belts l.
  • the pressure medium supplied into the pressure chambers may be at elevated temperature, for which reason the heating of board material to be pressed which may be necessary now and then is accomplished without any other expedients.
  • the belt or belts 1 may not only consist of steel but e.g., also of rubber. It can be stated in general that the material and design of the belt is chosen in accordance with the properties which one desires the board materialto be pressed to have. It is also possible to choose a modification in which the belts 1 are not endless but instead are lamination strips taken ofl a reel, which after passing through the press gap remain permanently adherent to the board material to be pressed. As has been said before, in a press according to the invention one may in some cases even totally omit the belts.
  • Improvement in a continuous action board press in which the board material to be pressed first is subjected to pressure by a press roll and then enters a pressure chamber, in which the board material to be pressed is loaded by a pressure medium, wherein the improvement comprises in that the pressure chamber extends up to the said press roll so that the press roll constitutes the front wall of the pressure chamber and that the surfaces defining the pressure chamber have been scaled against the press roll.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Press Drives And Press Lines (AREA)
US138258A 1970-04-30 1971-04-28 Continuous action board press Expired - Lifetime US3688688A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI701232A FI45527C (fi) 1970-04-30 1970-04-30 Jatkuvatoiminen levypuristin.

Publications (1)

Publication Number Publication Date
US3688688A true US3688688A (en) 1972-09-05

Family

ID=8505305

Family Applications (1)

Application Number Title Priority Date Filing Date
US138258A Expired - Lifetime US3688688A (en) 1970-04-30 1971-04-28 Continuous action board press

Country Status (6)

Country Link
US (1) US3688688A (fi)
CA (1) CA941653A (fi)
DE (1) DE2120763A1 (fi)
FI (1) FI45527C (fi)
SE (1) SE369685B (fi)
SU (1) SU376924A3 (fi)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4049487A (en) * 1973-08-27 1977-09-20 Kunz Bernard P Apparatus for producing honeycomb paneling
DE2937410A1 (de) * 1979-09-15 1981-04-02 Into Solymar Benalmadena Costa Malaga Kerttula Kontinuierlich arbeitende plattenpresse
US4738752A (en) * 1986-08-12 1988-04-19 Beloit Corporation Heated extended nip press apparatus
US5082533A (en) * 1990-04-10 1992-01-21 Beloit Corporation Heated extended nip press with porous roll layers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1027462A (en) * 1974-11-29 1978-03-07 George F. Russell Laminating traveling press and method
DE10021740C2 (de) * 2000-05-04 2002-03-14 Valmet Corp Verwendung einer Doppelbandpresse

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2135763A (en) * 1935-11-13 1938-11-08 Frederick A Nicholson Endless traveling platen fluid pressure press
US2909804A (en) * 1955-09-16 1959-10-27 Perry G Means Continuous hot pressing machine for the manufacture of compressed boards
US3340795A (en) * 1964-02-03 1967-09-12 Gustaf R Young Continuous laminating press with air film lubrication

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2135763A (en) * 1935-11-13 1938-11-08 Frederick A Nicholson Endless traveling platen fluid pressure press
US2909804A (en) * 1955-09-16 1959-10-27 Perry G Means Continuous hot pressing machine for the manufacture of compressed boards
US3340795A (en) * 1964-02-03 1967-09-12 Gustaf R Young Continuous laminating press with air film lubrication

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4049487A (en) * 1973-08-27 1977-09-20 Kunz Bernard P Apparatus for producing honeycomb paneling
DE2937410A1 (de) * 1979-09-15 1981-04-02 Into Solymar Benalmadena Costa Malaga Kerttula Kontinuierlich arbeitende plattenpresse
US4311550A (en) * 1979-09-15 1982-01-19 Bison-Werke Bahre & Greten Gmbh & Co. Kg Continuously operating board press
US4738752A (en) * 1986-08-12 1988-04-19 Beloit Corporation Heated extended nip press apparatus
US5082533A (en) * 1990-04-10 1992-01-21 Beloit Corporation Heated extended nip press with porous roll layers

Also Published As

Publication number Publication date
FI45527C (fi) 1976-02-10
FI45527B (fi) 1972-04-04
DE2120763A1 (de) 1971-11-18
SU376924A3 (fi) 1973-04-05
CA941653A (en) 1974-02-12
SE369685B (fi) 1974-09-16

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