US2854896A - Process for producing shaped articles, particularly plates - Google Patents

Process for producing shaped articles, particularly plates Download PDF

Info

Publication number
US2854896A
US2854896A US392841A US39284153A US2854896A US 2854896 A US2854896 A US 2854896A US 392841 A US392841 A US 392841A US 39284153 A US39284153 A US 39284153A US 2854896 A US2854896 A US 2854896A
Authority
US
United States
Prior art keywords
plates
press
staple
shaped articles
producing shaped
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
US392841A
Inventor
Marton Koloman
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.)
REXOLIT HOLZSTOFFPLATTEN GES M
Rexolit Holzstoffplatten Gesmbh
Original Assignee
REXOLIT HOLZSTOFFPLATTEN GES M
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 REXOLIT HOLZSTOFFPLATTEN GES M filed Critical REXOLIT HOLZSTOFFPLATTEN GES M
Application granted granted Critical
Publication of US2854896A publication Critical patent/US2854896A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B27N3/086—Presses with means for extracting or introducing gases or liquids in the mat
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/08—Impregnated or coated fibreboard

Definitions

  • the latter may consist of organic fibrous materials, such as saw-dust or shavings and binding agent, such as artificial resin; the binding agent may also be obtained from wood material itself by treating the chips of wood in appropriate manner.
  • the production of such shaped articles is generally carried out in hot presses which represent a particularly expensive part of the equipment and should be therefore utilized in the Widest possible manner for economical reasons. If the moulded materials to be pressed have a relatively high water content, drying of the same in a hot press would be very uneconomical. In such a case water cannot be removed by pressure but only by evaporation. The latter, however, requires considerable time during which the press must be inactive.
  • this drawback is eliminated in that the staple consisting of moulded material containing a relatively high water content is cold-pressed and after removing it from the press dried by heat supply. The time of pressing is thereby decreased to a minimum. Drying of the mass is efiected outside of the press, so that the latter is prepared very soon to press a new staple.
  • the staple is enclosed in the press in a gripping device in order to keep the staple under pressure also after removing it from the press during drying.
  • the process according to the invention is particularly appropriate for producing middle hard, relatively porous plates with a specific gravity of about 700-800 kg./m.
  • Such plates have a sufiicient insulating action, but besides this also a higher strength over typical dam plates. Also such typical dam plates with a lower specific gravity may be produced according to the invention.
  • Figs. 1 and 2 show a staple in front and side elevation, respectively.
  • Figs. 3 and 4 show a part of such a staple in an enlarged scale in cross-sectional view and top view, respectively.
  • Fig. 5 is a vertical section through the drying chamber.
  • each intermediate plate 2 consists of two spaced sheet-metals 3, connected with a series of parallel bridge elements 4 consisting of icemetal-sheet strips.
  • the connection between the metalsheets 3 and the strips 4 may be provided for example by spot-Welding. This is facilitated by the fact that the metal-sheets 3 are provided with several openings, for example in the 'form of slots 5 through which the strips 4 protrude freely outside. As illustrated in Fig. 4 the strips 4 run zigzag or wave-like, the advantage of this is indicated in the following.
  • the topmost intermediate plate 2 of the staple is connected with a series of parallel supports 6, the ends of which extend at both sides over the staple.
  • the lowest intermediate plate 2 is also connected with a series of parallel lower supports 7.
  • One pair of supports 6 and 7 each lying one above the other may be connected by a slotted frame 8 on its ends.
  • the staple of moulded material 1 and intermediate plates 2 arranged between the cross supports formed by the supports 6 and 7 are subjected without heat supply to a pressure of for example 30-50 atm. in a press which is indicated in Fig. l as an upper and lower press platen 9 and 10.
  • the other parts of the press are known per se and therefore are not shown. Thereby a great part of the water content of the moulded material is removed and the thickness of the latter is considerably decreased.
  • the frames 8 are connected with the extended series of supports 6 and 7, so that the staple is kept under pressure after having been removed from the press.
  • the cross supports 6, 7 and the frames 8 may be varied within the scope of the invention.
  • the formation of a gripping device enclosing the staple after its removing from the press and enabling the staple to be kept under pressure during the subsequent heating process is of importance.
  • the intermediate plates 2, having a total height, for example, of 20 mm, will Withstand the necessary pressures and bending or breaking strains, since the pressure is transferred by several bridge elements 4. Moreover an effective stifiening of the strips against bending or breaking is available by the zigzagor wave-form.
  • the staple is then transported on a carriage 15 into a drying chamber 11 provided with an inlet 12 and an outlet 13 for the heating medium.
  • heating medium hot air and hot Wasteor flue-gases may be used.
  • the staple is placed in the drying chamber in such a manner, that the channels formed between the strips 4 and the intermediate plates 2 run in the direction of the stream of the heating medium, i. e. from the left to the right in Fig. 5.
  • a cap 14 adjusted to the periphery of the staple directs the entire stream of the heating medium through said channels.
  • the zigmg or wave-form of the strips 4 aids the heating, since the heating medium is brought into contact more intensively with the strips 4 in view of their wound path.
  • the strips deliver their heat to the sheet-plates 3 and thereby to the material to be dried.
  • the heating stream may also be circulated in a rotary fashion, as it is known per se in drying processes. While the drying is finished for example in about two hours, the pressing operation merely lasts a few minutes, so that the press may be charged with new staples within short intervals. After drying and removing the slotted frames 8 the staple is separated into individual plates ready for use.
  • Process for the production of shaped articles comprising the steps of stacking molded articles of watersoaked fibrous material and spacing elements with draining channels in alternating relation between jaw members within a press, of cold-pressing the jaw members and the stack therebetween, of rigidly securing the jaw members to one another while clamping the stack in compressed condition, of removing the'stack clamped by the jaw members from the press and of subjecting the articles under continuous compression in said stack to a heating medium circulated through said channels.
  • a process for the production of plates from Watercontaining moulded materials comprising the steps; of stacking saidplates each spaced with spacing elements in. alternating relationship to provide parallel channels for heat circulation and water drainage; of compressing the stack thus produced in cold state between the platens of a press; ofproviding said stack while in said press under cold compression with means fixingand maintaining said compression independently of said press; of removing said compressedstack from said press in its compressed con dition; andofi exposing said stack under continuous compression to. a stream of hot gases circulated through the said channelsuntil the desired dryness of said plates is accomplished,
  • step of spacing is accomplished by the use of spacing elements which are positioned in said stack prior to compression to provide during compression and heating drainage of moisture and during heating simultaneously conduits for circulating hot gases.

Description

'Oct. 7, 1958 K. MARTON PROCESS FOR PRODUCING SHAPED ARTICLES, PARTICULARLY PLATES Filed NOV. 18, 1953 Fig.1
Fig. 5
Fig. 4
United States Patent PRGCESS FOR PRODUCING SHAPED ARTICLES, PARTICULARLY PLATES Koloman Marton, Rohrbach (Lafnitz), Styria, Austria, assignor to Rexolit Holzstofiplatten Ges. m. b. H., Rohrbach (Lafnitz), Styria, Austria Application November 18, 1953, Serial No. 392,841 Claims priority, application Austria November 19, 1952 7 Claims. (Cl. 92-=--54) The invention relates to a process and a device for producing shaped articles, particularly plates by pressing and heating water containing moulded materials. The latter may consist of organic fibrous materials, such as saw-dust or shavings and binding agent, such as artificial resin; the binding agent may also be obtained from wood material itself by treating the chips of wood in appropriate manner. The production of such shaped articles is generally carried out in hot presses which represent a particularly expensive part of the equipment and should be therefore utilized in the Widest possible manner for economical reasons. If the moulded materials to be pressed have a relatively high water content, drying of the same in a hot press would be very uneconomical. In such a case water cannot be removed by pressure but only by evaporation. The latter, however, requires considerable time during which the press must be inactive.
According to the invention this drawback is eliminated in that the staple consisting of moulded material containing a relatively high water content is cold-pressed and after removing it from the press dried by heat supply. The time of pressing is thereby decreased to a minimum. Drying of the mass is efiected outside of the press, so that the latter is prepared very soon to press a new staple. Preferably the staple is enclosed in the press in a gripping device in order to keep the staple under pressure also after removing it from the press during drying. For most elfective and rapid drying the pressed and stapled moulded materials under pressure it is moreover advisable to put between the stapled moulded material not merely sheet metals, as usual, but also intermediate members having one or several passing channels through which a heating medium is guided in the drying step. By this means the moulded material is effectively heated within the staple.
The process according to the invention is particularly appropriate for producing middle hard, relatively porous plates with a specific gravity of about 700-800 kg./m. Such plates have a sufiicient insulating action, but besides this also a higher strength over typical dam plates. Also such typical dam plates with a lower specific gravity may be produced according to the invention.
In the accompanying drawing the invention is illustrated for example by means of a device for producing plates.
Figs. 1 and 2 show a staple in front and side elevation, respectively.
Figs. 3 and 4 show a part of such a staple in an enlarged scale in cross-sectional view and top view, respectively.
Fig. 5 is a vertical section through the drying chamber.
It is assumed that plates are to be produced from a material consisting of about equal parts by weight of dry substance and of water. According to Figs. 1 and 2 moulds 1 consisting of this material are arranged alternatively with intermediate plates 2 to a staple one above the other. According to Figs. 3 and 4 each intermediate plate 2 consists of two spaced sheet-metals 3, connected with a series of parallel bridge elements 4 consisting of icemetal-sheet strips. The connection between the metalsheets 3 and the strips 4 may be provided for example by spot-Welding. This is facilitated by the fact that the metal-sheets 3 are provided with several openings, for example in the 'form of slots 5 through which the strips 4 protrude freely outside. As illustrated in Fig. 4 the strips 4 run zigzag or wave-like, the advantage of this is indicated in the following.
The topmost intermediate plate 2 of the staple is connected with a series of parallel supports 6, the ends of which extend at both sides over the staple. In the same manner the lowest intermediate plate 2 is also connected with a series of parallel lower supports 7. One pair of supports 6 and 7 each lying one above the other may be connected by a slotted frame 8 on its ends.
The staple of moulded material 1 and intermediate plates 2 arranged between the cross supports formed by the supports 6 and 7 are subjected without heat supply to a pressure of for example 30-50 atm. in a press which is indicated in Fig. l as an upper and lower press platen 9 and 10. The other parts of the press are known per se and therefore are not shown. Thereby a great part of the water content of the moulded material is removed and the thickness of the latter is considerably decreased. Thereupon the frames 8 are connected with the extended series of supports 6 and 7, so that the staple is kept under pressure after having been removed from the press. The cross supports 6, 7 and the frames 8 may be varied within the scope of the invention. The formation of a gripping device enclosing the staple after its removing from the press and enabling the staple to be kept under pressure during the subsequent heating process is of importance. The intermediate plates 2, having a total height, for example, of 20 mm, will Withstand the necessary pressures and bending or breaking strains, since the pressure is transferred by several bridge elements 4. Moreover an effective stifiening of the strips against bending or breaking is available by the zigzagor wave-form.
The staple is then transported on a carriage 15 into a drying chamber 11 provided with an inlet 12 and an outlet 13 for the heating medium. As heating medium hot air and hot Wasteor flue-gases may be used. The staple is placed in the drying chamber in such a manner, that the channels formed between the strips 4 and the intermediate plates 2 run in the direction of the stream of the heating medium, i. e. from the left to the right in Fig. 5. A cap 14 adjusted to the periphery of the staple directs the entire stream of the heating medium through said channels. By this means the sheet-plates 3 and therefore also each individual mould 1 are intensively heated. The developed water vapour may escape not only at the rims of the plates, but also through the numerous slots 5. The zigmg or wave-form of the strips 4 aids the heating, since the heating medium is brought into contact more intensively with the strips 4 in view of their wound path. The strips deliver their heat to the sheet-plates 3 and thereby to the material to be dried. The heating stream may also be circulated in a rotary fashion, as it is known per se in drying processes. While the drying is finished for example in about two hours, the pressing operation merely lasts a few minutes, so that the press may be charged with new staples within short intervals. After drying and removing the slotted frames 8 the staple is separated into individual plates ready for use.
I claim:
1. Process for the production of shaped articles comprising the steps of stacking molded articles of watersoaked fibrous material and spacing elements with draining channels in alternating relation between jaw members within a press, of cold-pressing the jaw members and the stack therebetween, of rigidly securing the jaw members to one another while clamping the stack in compressed condition, of removing the'stack clamped by the jaw members from the press and of subjecting the articles under continuous compression in said stack to a heating medium circulated through said channels.
2. Process.accordingtoclaim 1 and wherein the drainingchannelsextend from 'one side of the stack to-the other.
3. Process according to claim 1 and wherein the Watersoaked fibrous material is of organic origin.
4. Process according to claim 1 and wherein the shaped articles areplates.
5. A process for the production of plates from Watercontaining moulded materials, comprising the steps; of stacking saidplates each spaced with spacing elements in. alternating relationship to provide parallel channels for heat circulation and water drainage; of compressing the stack thus produced in cold state between the platens of a press; ofproviding said stack while in said press under cold compression with means fixingand maintaining said compression independently of said press; of removing said compressedstack from said press in its compressed con dition; andofi exposing said stack under continuous compression to. a stream of hot gases circulated through the said channelsuntil the desired dryness of said plates is accomplished,
, 6. A process as, claimed in claim 5, wherein said mou1ded materials comprise water-soaked. organic fibers.
7. A process as claimed in claim 5, wherein said step of spacing is accomplished by the use of spacing elements which are positioned in said stack prior to compression to provide during compression and heating drainage of moisture and during heating simultaneously conduits for circulating hot gases.
References Cited in the file of this patent UNITED STATES PATENTS 318,741 Hotchkiss May 26, 1885 484,301 Day Oct. 11, 1892 656,682 Westaway Aug. 28, 1900 753,904 McFarland Mar. 8, 1904 1,134,247 Vogt Apr. 6, 1915 1,456,189 Palmer May 22, 1923 1,704,706 Hawley Mar. 12, 1929 1,785,484 Kastner et a1. Dec. 16, 1930 1,812,970 Mason July 7, 1931 1,894,777 Mason Jan. 17, 1933 2,045,047 Nevitt June 23, 1936 2,108,795 Budd Feb. 22, 1938 2,583,443 Perry et al. Jan. 22, 1952 FOREIGN PATENTS 248 Great Britain of 1905 664,924 Great Britain Jan. 16, 1952
US392841A 1952-11-19 1953-11-18 Process for producing shaped articles, particularly plates Expired - Lifetime US2854896A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT2854896X 1952-11-19

Publications (1)

Publication Number Publication Date
US2854896A true US2854896A (en) 1958-10-07

Family

ID=3690472

Family Applications (1)

Application Number Title Priority Date Filing Date
US392841A Expired - Lifetime US2854896A (en) 1952-11-19 1953-11-18 Process for producing shaped articles, particularly plates

Country Status (1)

Country Link
US (1) US2854896A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126578A (en) * 1964-03-31 board forming press and method of making board substitutes
US3277814A (en) * 1963-10-21 1966-10-11 Defibrator Ab Sieve plate for manufacture of fiber board and similar board products
US4030879A (en) * 1975-10-24 1977-06-21 Institutul De Cercetare Proiectare Si Documentare Pentru Industria Materialelor De Constructii Apparatus for drying ceramic bodies
EP0443053A1 (en) * 1990-02-20 1991-08-28 Werzalit Ag + Co. Method and device for the production of shaped parts

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US318741A (en) * 1885-05-19 eotcekiss
US484301A (en) * 1892-10-11 Method of pressing and drying plants and presses adapted therefor
US656682A (en) * 1900-04-20 1900-08-28 James Westaway Apparatus for compressing pulp.
US753904A (en) * 1903-01-02 1904-03-08 Thomas W Mcfarland Machine for drying paper-board.
GB190500248A (en) * 1905-01-05 1906-01-05 Francisco Matas Y Rodes Improvements in and relating to the Manufacture of Cork Compositions.
US1134247A (en) * 1913-10-25 1915-04-06 Johann Vogt Process for drying boards and the like.
US1456189A (en) * 1921-04-26 1923-05-22 J F Tapley Co Binder's pressboard
US1704706A (en) * 1921-11-09 1929-03-12 Arvey Mfg Co Method of and apparatus for treating and handling fibrous pulp
US1785484A (en) * 1927-01-29 1930-12-16 Kastner Richard Process of and apparatus for treating paperboard and the like
US1812970A (en) * 1929-01-23 1931-07-07 Masonite Corp Process of manufacturing insulating board
US1894777A (en) * 1929-04-03 1933-01-17 Masonite Corp Production of vegetable fiber sheets
US2045047A (en) * 1935-02-18 1936-06-23 Murray Co Follow block
US2108795A (en) * 1934-03-22 1938-02-22 Budd Edward G Mfg Co Double-walled sheet metal structure and method of making
GB664924A (en) * 1948-03-12 1952-01-16 Secheron Atel Improvements in or relating to processes for the seasoning of pieces of timber and device for performing it
US2583443A (en) * 1947-12-04 1952-01-22 Walter M Perry Pallet for handling materials

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US318741A (en) * 1885-05-19 eotcekiss
US484301A (en) * 1892-10-11 Method of pressing and drying plants and presses adapted therefor
US656682A (en) * 1900-04-20 1900-08-28 James Westaway Apparatus for compressing pulp.
US753904A (en) * 1903-01-02 1904-03-08 Thomas W Mcfarland Machine for drying paper-board.
GB190500248A (en) * 1905-01-05 1906-01-05 Francisco Matas Y Rodes Improvements in and relating to the Manufacture of Cork Compositions.
US1134247A (en) * 1913-10-25 1915-04-06 Johann Vogt Process for drying boards and the like.
US1456189A (en) * 1921-04-26 1923-05-22 J F Tapley Co Binder's pressboard
US1704706A (en) * 1921-11-09 1929-03-12 Arvey Mfg Co Method of and apparatus for treating and handling fibrous pulp
US1785484A (en) * 1927-01-29 1930-12-16 Kastner Richard Process of and apparatus for treating paperboard and the like
US1812970A (en) * 1929-01-23 1931-07-07 Masonite Corp Process of manufacturing insulating board
US1894777A (en) * 1929-04-03 1933-01-17 Masonite Corp Production of vegetable fiber sheets
US2108795A (en) * 1934-03-22 1938-02-22 Budd Edward G Mfg Co Double-walled sheet metal structure and method of making
US2045047A (en) * 1935-02-18 1936-06-23 Murray Co Follow block
US2583443A (en) * 1947-12-04 1952-01-22 Walter M Perry Pallet for handling materials
GB664924A (en) * 1948-03-12 1952-01-16 Secheron Atel Improvements in or relating to processes for the seasoning of pieces of timber and device for performing it

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126578A (en) * 1964-03-31 board forming press and method of making board substitutes
US3277814A (en) * 1963-10-21 1966-10-11 Defibrator Ab Sieve plate for manufacture of fiber board and similar board products
US4030879A (en) * 1975-10-24 1977-06-21 Institutul De Cercetare Proiectare Si Documentare Pentru Industria Materialelor De Constructii Apparatus for drying ceramic bodies
EP0443053A1 (en) * 1990-02-20 1991-08-28 Werzalit Ag + Co. Method and device for the production of shaped parts

Similar Documents

Publication Publication Date Title
US4162877A (en) Method and apparatus for consolidating particle board
US3891738A (en) Method and apparatus for pressing particleboard
US2909804A (en) Continuous hot pressing machine for the manufacture of compressed boards
US2064965A (en) Method and means for treating wood
NO115680B (en)
US1862688A (en) Process for making a fibrous building material
CN1970259A (en) Method for producing bamboo board
US2854896A (en) Process for producing shaped articles, particularly plates
US4112587A (en) Method and means for drying a fibre material containing cellulose
US3686383A (en) Method for hot-pressing sheets of substances containing lignocellulose
US3188367A (en) Process for manufacturing plates from wood shavings and fibers
US3284917A (en) Warpage control in molded pulp articles
US1844861A (en) Process for the manufacture of vegetable fiber products
CA2612159A1 (en) Method for the treatment of wood or wood products
US4128947A (en) Process and apparatus for drying textile stock and the like
KR20210008771A (en) Method for manufacturing deck board using domestically produced oak tree and deck board manufactured thereby
US1785544A (en) Process and apparatus for disintegrating wood
US3130114A (en) Process of manufacturing fibreboards and pressings from lignocellulose material
US1894777A (en) Production of vegetable fiber sheets
US2089644A (en) Process for the production of compressed wood or plywood
US3002878A (en) Compressed cellulosic product and method of making same
US2904893A (en) Process of humidifying hardboard
US2960428A (en) Method of treating sheets of ligno cellulose
JP4269004B2 (en) Wood consolidation method
JP3202065B2 (en) Wood processing equipment