US3383735A - Apparatus for the manufacture of pressed boards - Google Patents
Apparatus for the manufacture of pressed boards Download PDFInfo
- Publication number
- US3383735A US3383735A US157055A US15705561A US3383735A US 3383735 A US3383735 A US 3383735A US 157055 A US157055 A US 157055A US 15705561 A US15705561 A US 15705561A US 3383735 A US3383735 A US 3383735A
- Authority
- US
- United States
- Prior art keywords
- press
- sheets
- coating
- boards
- blank
- 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
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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
- B27N3/06—Making particle boards or fibreboards, with preformed covering layers, the particles or fibres being compressed with the layers to a board in one single pressing operation
-
- 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
-
- 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
- B27N3/16—Transporting the material from mat moulding stations to presses; Apparatus specially adapted for transporting the material or component parts therefor, e.g. cauls
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/20—Molding plants
- Y10S425/201—Diverse stations
Definitions
- the main idea of this invention consists in employing the coating or facing sheets, designed to be pressed with the rough particle blank, also for the transport of the blanks and for the insertion of the latter into the press.
- particle blanks are formed separately on the coating sheets or coating films and the thus prepared blanks are transported by means of these coating sheets or films and inserted into the open press.
- the blanks with the coating sheets, serving for their transport and loading the press are united together into compact boards.
- the coating sheets or faces fulfill two functions in the method according to this invention: first, they serve as a support during the distribution or the felting of the particles while a blank is preformed, and subsequently for the insertion of this blank into a press. Secondly, thecoating sheets then serve, in another stage of the method, as supports during pressing, and at the same time being joined or bonded with the prefabricated or preformed blanks in the form of compact boards.
- the invention also includes equipment for carrying out the above method.
- This equipment is characterized by means for bringing coating sheets to a point of formation of particle blanks and by pulling means with pincers or similar members gripping the sheets for the transport of these sheets loaded with the preformed blanks from said point into the open press.
- a single stage press To the right of the drawing is shown a single stage press. It consists of two hydraulic cylinders 3 mounted in a pit 2 formed in a base 1, these cylinders being fed with oil under pressure through ducts not shown. Press pistons 4 mounted in these cylinders support a lower press table 5. The upper press table is shown at 6. Heated press slabs 7 and 8 are integral with the press tables 5 and 6 respectively, these heated slabs having, for example, holes for the flow of a heating fluid. A distribution point 11 endowed with reciprocating motion is disposed in front of the press. Such distribution points are known which permit, for example, of distributing in several passages wood shavings for producing a blank of several layers on a stationary support.
- this distribution takes place on a sheet of newsprint paper 9 which, during this operation, rests on a stationary table 18.
- the paper sheets are separated from a strip issuing from a roller 12, through the agency of a cutting device 13 and have a width which slightly exceeds that of the blank to be produced.
- the carrying out of the method with the equipment described is of the simplest.
- the end of the paper strip issuing from the roller 12 is gripped by a pincher 17 and a sheet is cut into sections by the cutting device 13, as soon as this pincer has been moved a predetermined amount by the chain 14.
- the chain conveyor is stopped, and the distribution point 11 is moved to and fro in order to distribute particles on the sheet 9 which is under the said point. During this period the press is closed.
- the sheet 9 extending under the distribution point 11 together with the performed blank thereon is pulled by means of a pincer 17 fixed to the chain 14 again in motion, so as to be brought into the empty and open press while, simultaneously, another coating sheet is brought under the distribution point 11.
- the corresponding pincer opens and the lower press table 5 is raised hydraulically.
- the coating sheets 9 and the blank 10 are pressed so as to form an inseparable whole.
- a single stage press is employed.
- a multi-stage press it is necessary to dispose a loading frame which moves upwardly and downwardly next to the press.
- sheets are brought to the distribution point 11, these sheets being separated over a predetermined length.
- the blanks consist of relatively coarse wood particles, one must arrange between the coating sheets and the blank a levelling wad-layer of very fine material such as wood-dust, sawdust and the like.
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)
Description
May 21, 1968 F. PAERELS APPARATUS FOR THE MANUFACTURE OF PRESSED BOARDS Filed Dec. 5, 1961 lNVENTo R FKANS PAEREL s ATT RNE United States Patent 3,383,735 APPARATUS FOR THE MANUFACTURE OF PRESSED BOARDS Frans Paerels, Zurich, Switzerland, assignor to Fred Fahrni, Zurich, Switzerland Filed Dec. 5, 1961, Ser. No. 157.055 Claims priority, application Switzerland, Dec. 7, 1960,
13,699/60 1 Claim. (Cl. 18-4) It is known to manufacture, from particles such as wood shavings, fibres and the like mixed with a heat hardening binder, boards provided with a coating and pressed in a heat press in one operation. The invention concerns apparatus used to practice a method in which at least one of the faces of the board must be provided with a coating. Until now, one distributed in a uniform manner by a suitable operation a mass of particles on separated press plates and then one disposed on the blank thu produced a coating sheet and one pressed the whole in a press to form a solid body. In many cases, one disposed on the rigid press plate a coating sheet before bringing the particles thereto. This was particularly necessary when one had to press in a single operation boards provided with a coating on both faces. In the known method, the press plates remain in the press during the whole pressing operation and must be brought back to the particle distribution point after the end of this stage of the method.
The main idea of this invention consists in employing the coating or facing sheets, designed to be pressed with the rough particle blank, also for the transport of the blanks and for the insertion of the latter into the press. According to the invention, particle blanks are formed separately on the coating sheets or coating films and the thus prepared blanks are transported by means of these coating sheets or films and inserted into the open press. In the press, the blanks with the coating sheets, serving for their transport and loading the press, are united together into compact boards.
Applicants apparatus is used to practice a method which permits eliminating the press plates. This constitutes a considerable simplification. Thus, the cost of manufacture is reduced because the return movement of the plates is abolished, and it is no longer necessary to check whether the thicknesses and the weights of the plates are within the tolerance limits previously set. The coating sheets or faces fulfill two functions in the method according to this invention: first, they serve as a support during the distribution or the felting of the particles while a blank is preformed, and subsequently for the insertion of this blank into a press. Secondly, thecoating sheets then serve, in another stage of the method, as supports during pressing, and at the same time being joined or bonded with the prefabricated or preformed blanks in the form of compact boards.
It has already been proposed in the case of the formation of endless strips of fibrous particles to provide them on the upper and lower faces simultaneously with a paper strip and to press the whole between two heated and moving endless steel bands in order to produce a body which is then cut into separate slabs. By this prior method the strip of coating paper does not however fulfill the function of a conveyor for the mat of particles, since the lower paper strip rests on a band or the like circulating during the movement. Moreover, it is not in the prior method a matter of pressing individual blanks consisting of loose particles.
The invention also includes equipment for carrying out the above method. This equipment is characterized by means for bringing coating sheets to a point of formation of particle blanks and by pulling means with pincers or similar members gripping the sheets for the transport of these sheets loaded with the preformed blanks from said point into the open press.
The single figure of the accompanying drawing shows, by way of a non-restrictive example, one embodiment of the equipment forming the object of the present invention.
To the right of the drawing is shown a single stage press. It consists of two hydraulic cylinders 3 mounted in a pit 2 formed in a base 1, these cylinders being fed with oil under pressure through ducts not shown. Press pistons 4 mounted in these cylinders support a lower press table 5. The upper press table is shown at 6. Heated press slabs 7 and 8 are integral with the press tables 5 and 6 respectively, these heated slabs having, for example, holes for the flow of a heating fluid. A distribution point 11 endowed with reciprocating motion is disposed in front of the press. Such distribution points are known which permit, for example, of distributing in several passages wood shavings for producing a blank of several layers on a stationary support. In the example shown, this distribution takes place on a sheet of newsprint paper 9 which, during this operation, rests on a stationary table 18. The paper sheets are separated from a strip issuing from a roller 12, through the agency of a cutting device 13 and have a width which slightly exceeds that of the blank to be produced.
In order to bring the paper sheets 9 serving as a support together with the blanks 10 into the open press, there is provided an endless chain 14 passing over toothed wheels 15 and 16 and provided with pincers 17 distributed at regular intervals. These pincers extend over the whole width of the sheets 9 and a similar chain should therefore be provided on the other side of the table 18 and of the press, passing over chain wheels mounted on the same spindles as the wheels 15 and 16. In order to withdraw the pressed boards, use is made of a table 19 on the outlet side of the heat press.
The carrying out of the method with the equipment described is of the simplest. The end of the paper strip issuing from the roller 12 is gripped by a pincher 17 and a sheet is cut into sections by the cutting device 13, as soon as this pincer has been moved a predetermined amount by the chain 14. As soon as the pincer together with the empty paper sheet is at a specified point in front of the press, the chain conveyor is stopped, and the distribution point 11 is moved to and fro in order to distribute particles on the sheet 9 which is under the said point. During this period the press is closed. After the opening of the press, and the withdrawall of the still hot board which has just been pressed, the sheet 9 extending under the distribution point 11 together with the performed blank thereon, is pulled by means of a pincer 17 fixed to the chain 14 again in motion, so as to be brought into the empty and open press while, simultaneously, another coating sheet is brought under the distribution point 11. As soon as the particle blank is in the press, the corresponding pincer opens and the lower press table 5 is raised hydraulically. After the pressing operation, the coating sheets 9 and the blank 10 are pressed so as to form an inseparable whole. Of course, at the end of the distribution operation and before the insertion of the blank in the press, one may dispose another coating sheet on the upper face so that the final product be coated on both sides.
In the embodiment shown, a single stage press is employed. When it is desired to have a greater capacity of manufacture, use may be made of a multi-stage press. In such a case, it is necessary to dispose a loading frame which moves upwardly and downwardly next to the press. Moreover, it is assumed that sheets are brought to the distribution point 11, these sheets being separated over a predetermined length. In certain cases, one prefers to form the blanks on the paper strip itself by providing spaces between them and only cutting this paper strip when the blanks are inserted in the press. By employing a single stage press, one could only proceed with the separation of the coating sheets after the pressing of the boards.
One may employ as coating sheets, paper, veneer sheets, synthetic resin sheets, or sheets impregnated with unhardened synthetic resin, as well, for example, as sheets of stratified plastic material. Further, it may also be advantageous to use textile or other fabrics for the designed purpose. According to the kind of coating sheets, these are either unwound from a roller, or withdrawn from a pile for example, by means of suitable sucking-disks forming part of a transport device.
Care must be taken that the coating sheets adhere completely to the boards after the processing operation. To this end, it is advisable to spray these sheets before the formation of the blanks with a binding agent solution or with dissolved components of a synthetic resin binder, preferably, with an aqueous soultion of a concentrate of urea formaldehyde and of an aqueous urea solution. It is recommended furthermore to moisten the sheets, for example by adding water to such solutions specially for relatively high pressing temperatures; the additional moisture then prevents a too rapid undesirable drying of the outer layers and the premature solidification of the binding agent. If difiiculties are encountered during the transport of the moistened sheets each loaded with a blank as a result of lower resistance to tearing, it is the recommended to form air cushions reducing the friction between the stationary support and the loaded sheet. To this end, one may dispose in the stationary support several apertures for compressed air, suitably distributed. This principle may even be employed in the heat press. One here thinks, for example, of the possibility of regularly disposing on the lower press table a large number of small apertures and choosing the shape of these apertures in such a way that a print of these apertures on the finished board apears in the form of raised marks improving the aesthetic appearance of the surface of the board. On the other hand, if the surface of the coated board must be particularly fine and smooth,
and if the blanks consist of relatively coarse wood particles, one must arrange between the coating sheets and the blank a levelling wad-layer of very fine material such as wood-dust, sawdust and the like.
The embodiment of the invention shown and described is indicated merely by way of example and it is obvious that any modifications may be brought to the details of the invention, without however departing from the compass of this invention.
What I claim is:
1. Equipment for the manufacture of pressed boards, with a coating sheet on at least one side, by a single operation in a hot press, said boards being formed from relatively small wood particles, such as shavings, chips, fibers or the like, which have previously been coated with a thermosetting binder, characterized by a particle scattering station for the formation of particle blanks, means for delivering empty coating sheets to a point below said particle scattering station, a consolidating press, a sationary support which extends from said scattering station to said consolidating press and upon which the blank loaded sheets move, and driven endless chains having gripping members for gripping the blank loaded sheets and pulling them over the stationary support from said scattering station into said press.
References Cited UNITED STATES PATENTS 2,782,458 2/1957 Emmert et al 264-288 X 2,989,774 6/1961 Erickson et al. 264-118 X 3,014,234 12/1961 Koppehele 264-289 2,601,349 6/1952 Welch 264-112 X 2,028,616 1/1936 Loetscher 264-112 X 3,054,714 9/1962 Johnston 264-112 X 3,070,838 1/1963 Hostettler 264112 X 2,784,763 3/1957 Shorts 156-374 X 2,538,972 1/1951 Magnani 83-24 ALEXANDER H. BRODMERKEL, Primary Examiner.
P. E. ANDERSON, Assistant Examiner.
Claims (1)
1. EQUIPMENT FOR THE MANUFACTURE OF PRESSED BOARDS, WITH A COATING SHEET ON AT LEAST ONE SIDE, BY A SINGLE OPERATION IN A HOT PRESS, SAID BOARDS BEING FORMED FROM RELATIVELY SMALL WOOD PARTICLES, SUCH AS SHAVINGS, CHIPS, FIBERS OR THE LIKE, WHICH HAVE PREVIOUSLY BEEN COATED WITH A THERMOSETTING BINDER, CHARACTERIZED BY A PARTICLE SCATTERING STATION FOR THE FORMATION OF PARTICLE BLANKS, MEANS FOR DELIVERING EMPTY COATING SHEETS TO A POINT BELOW SAID PARTICLE SCATTERING STATION, A CONSOLIDATING PRESS, A SATIONARY SUPPORT WHICH EXTENDS FROM SAID SCATTERING STATION TO SAID CONSOLIDATING PRESS AND UPON WHICH THE BLANK LOADED SHEETS MOVE, AND DRIVEN ENDLESS CHAINS HAVING GRIPPING MEMBERS FOR GRIPPING THE BLANK LOADED SHEETS AND PULLING THEM OVER THE STATIONARY SUPPORT FROM SAID SCATTERING STATION INTO SAID PRESS.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1369960A CH382439A (en) | 1960-12-07 | 1960-12-07 | Method and device for the production of press plates which are pressed in a single operation in a hot press and coated on at least one side |
Publications (1)
Publication Number | Publication Date |
---|---|
US3383735A true US3383735A (en) | 1968-05-21 |
Family
ID=4394582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US157055A Expired - Lifetime US3383735A (en) | 1960-12-07 | 1961-12-05 | Apparatus for the manufacture of pressed boards |
Country Status (3)
Country | Link |
---|---|
US (1) | US3383735A (en) |
CH (1) | CH382439A (en) |
GB (1) | GB965108A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109775316A (en) * | 2019-03-19 | 2019-05-21 | 台州市智诚工业设计有限公司 | A kind of wood raw material limit conveying mechanism |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT248364B (en) * | 1964-10-12 | 1966-07-25 | Voest Ag | Pull-in device for systems that process strip material |
WO2010045742A1 (en) * | 2008-10-21 | 2010-04-29 | Uniboard Canada Inc. | Embossed monolayer particleboards and methods of preparation thereof |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2028616A (en) * | 1934-01-02 | 1936-01-21 | Emil C Loetscher | Apparatus for the manufacture of a composite building material |
US2538972A (en) * | 1940-12-24 | 1951-01-23 | Magnani Alessandro | Method and apparatus for production of fibrous cement articles |
US2601349A (en) * | 1944-08-09 | 1952-06-24 | Arthur R Welch | Method of and apparatus for making covered wood products |
US2782458A (en) * | 1954-12-07 | 1957-02-26 | Dale C Emmert | Method and apparatus for producing flat fiberglass reinforced plastic panels |
US2784763A (en) * | 1952-10-02 | 1957-03-12 | Shorts Calhoun | Method and apparatus for making fiberreinforced sheet material |
US2989774A (en) * | 1957-03-21 | 1961-06-27 | Schubert | Mat handling method and apparatus |
US3014234A (en) * | 1959-12-21 | 1961-12-26 | American Viscose Corp | Method and apparatus for biaxially stretching films |
US3054714A (en) * | 1958-02-03 | 1962-09-18 | Owens Corning Fiberglass Corp | Method of producing panels of fibrous glass |
US3070838A (en) * | 1959-07-03 | 1963-01-01 | Fred Fahrni | Moulding line for moulding loose particle material into preliminary blanks destined to be pressed in a multiple tier press |
-
1960
- 1960-12-07 CH CH1369960A patent/CH382439A/en unknown
-
1961
- 1961-12-05 GB GB43454/61A patent/GB965108A/en not_active Expired
- 1961-12-05 US US157055A patent/US3383735A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2028616A (en) * | 1934-01-02 | 1936-01-21 | Emil C Loetscher | Apparatus for the manufacture of a composite building material |
US2538972A (en) * | 1940-12-24 | 1951-01-23 | Magnani Alessandro | Method and apparatus for production of fibrous cement articles |
US2601349A (en) * | 1944-08-09 | 1952-06-24 | Arthur R Welch | Method of and apparatus for making covered wood products |
US2784763A (en) * | 1952-10-02 | 1957-03-12 | Shorts Calhoun | Method and apparatus for making fiberreinforced sheet material |
US2782458A (en) * | 1954-12-07 | 1957-02-26 | Dale C Emmert | Method and apparatus for producing flat fiberglass reinforced plastic panels |
US2989774A (en) * | 1957-03-21 | 1961-06-27 | Schubert | Mat handling method and apparatus |
US3054714A (en) * | 1958-02-03 | 1962-09-18 | Owens Corning Fiberglass Corp | Method of producing panels of fibrous glass |
US3070838A (en) * | 1959-07-03 | 1963-01-01 | Fred Fahrni | Moulding line for moulding loose particle material into preliminary blanks destined to be pressed in a multiple tier press |
US3014234A (en) * | 1959-12-21 | 1961-12-26 | American Viscose Corp | Method and apparatus for biaxially stretching films |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109775316A (en) * | 2019-03-19 | 2019-05-21 | 台州市智诚工业设计有限公司 | A kind of wood raw material limit conveying mechanism |
Also Published As
Publication number | Publication date |
---|---|
CH382439A (en) | 1964-09-30 |
GB965108A (en) | 1964-07-29 |
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