US3283048A - Method and apparatus for producing pressed plates - Google Patents

Method and apparatus for producing pressed plates Download PDF

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US3283048A
US3283048A US210524A US21052462A US3283048A US 3283048 A US3283048 A US 3283048A US 210524 A US210524 A US 210524A US 21052462 A US21052462 A US 21052462A US 3283048 A US3283048 A US 3283048A
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wood
mixture
chip
wood particles
chips
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Hoppeler Walter
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    • 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
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • 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
    • B27N1/00—Pretreatment of moulding material

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  • the present invention relates to a method and apparatus for producing pressed plates and more particularly is concerned with a method and apparatus for producing pressed plates of wood particles and hardenable, preferably thermoplastic binder material.
  • the amount of dust formed upon grinding of the plates will equal between about 5 and 20% of the total weight of the plates, depending on the thickness of the same.
  • the final wood particles and particularly the wood dust absorb a higher proportion of the binder material than the larger wood particles.
  • the absorption of binder material is substantially corresponding to the available surface of the Wood particles.
  • smaller wood particles have a relatively larger surface area than larger wood particles, more glue or binder material will be absorbed per unit of volume by smaller or dust-like Wood particles than by larger wood particles.
  • the smaller the wood particle the larger will be the surface area per unit of volume and thus, the larger will be the amount of binder material absorbed by the wood particles. Since conventially a given relationship is maintained between the amount of binder material and the amount of wood particles, i e.
  • the excessive amount of binder material which thus might be present in the outer portions of the plate i.e. the portions which according to this method are formed of Wood dust and finely particulate wood, will not increase the strength of the plate and, furthermore, during the grinding of the pressed plates, the outermost portions which contain most of the binder materialwill be ground off and thus no longer form part of the plate.
  • the hard binder layer formed in this manner in the outer portion of the plate causes great difficulties during the planing and in any event excessive wear of the cutting or grinding tools.
  • the bending strength or rigidity of the plate is impaired by having excessive proportions of wood dust and finely particulate wood in the outermost portions of the plate.
  • the present invention comprises in a method of producing pressed plates by hot pressing a plurality of superposed layers formed of mixtures consisting essentially of wood particles of different size ranges and hardenable binder material, the improvement which consists in separating the wood particles which are to form at least one of the superposed layer into the different size ranges, forming a first homogeneous mixture of predetermined proportions of the separated wood particles of different size ranges, in-timately mixing the first homogeneous mixture with hardenable binder material so as to form a second mixture adapted to be hot pressed into a pressed plate, forming a plurality of superposed layers each consisting essentially of a mixture of wood particles and hardenable binder material, at least one of the plurality of superposed layers being formed of the second mixture, and subjecting the plurality of superposed layers to hot pressing so as to form a pressed plate thereof.
  • the present invention contemplates in a method of producing pressed plates by hot pressing a plurality of superposed layers formed of mixtures consisting essentially of wood particles of difierent size ranges and hardenable binder material, the improvement which consists in separating the wood patricles which are to form each of the superposed layers into the different size ranges, continuously forming a plurality of homogeneous mixtures of predetermined volumetric proportions of the separated wood particles of different size ranges, each of the plurality of homogeneous mixtures being adapted to form one of the superposed layers of the plurality of superposed layers, drying the thus formed homogeneous mixtures, respectively, intimately mixing a predetermined volumetric proportion of each-of the thus dried homogeneous mixtures, respec-' tively, with hardenable binder material soas to form a plurality of latently adhesive mixtures adapted to be hot pressed into a pressed plate, forming without sifting of the plurality of latently adhesive homogen
  • the present invention also includes in an arrangement for producing pressed plates, in combination, separating means for separating wood particles into different size fractions, storage means operatively connected to the separating means for storing the thus separated fractions of wood particles, and mixing means for mixing predetermined proportions of the respective stored separated wood fractions so as to form thereof a homogeneous mixture of wood particles of predetermined size distribution.
  • the problems discussed further above are solved according to the present invention by forming at least one of the layers of which the pressed plate is made of a substantially homogeneous mixture of wood particles of various sizes which mixture contains predetermined quantities of the various size ranges. This is preferably accomplished by first sorting the wood particles into separate size ranges and then to withdraw predetermined proportions from the storage hopper or the like for each of these size ranges and to form an intimate mixture of the thus withdrawn proportions. The binder material is then admixed to this mixture of predetermined proportions of material, a layer is formed of this mixture and is then subjected to hot pressing as will be described in more detail further below.
  • the thus formed plate will consist of a relatively small number of layers each of which will consist of a homogeneous mixture of wood particles of various sizes, whereby the individual sizes or size ranges of the wood particles will be present in predetermined proportions.
  • the arrangement in which the above described metho is carried out will include sifting, separating or classifying means for separating wood particles into several size 4 ranges, storage means for storing the thus separated wood fractions, and means for withdrawing predetermined amounts of the individual wood fractions from the storage means therefor, and for mixing these predetermined fractions or proportions.
  • the raw material must be sorted by qualities and dimensions prior to being introduced into the manufacturing process and the proportions of various qualities quality and dimensions are then comminuted, sifted into several fractions or size ranges of the thus produced chips and then stored-in individual storage containers or hoppers each of which will hold o'hips of even wood quality and substantially even size. Chips which were bought as such or which accrue in the production of pressed plates are also comminuted and classified and then stored in the respective storage containers assigned for such quality and size. It is desirable that the wood is treated with respect to its moist-ure content in such a manner and so stored that the moisture content of the wood will be within relatively narrow predetermined limits. Practically it is not possible up to now to arrive at a constant moisture content of the wood in an economical manner so that it is necessary to carry out a continuous and accurate control of the moisture content of the chips which are to be processed into pressed plates.
  • the chips according to size in separate hoppers and then mixing proportions of the various sizes of chips in a predetermined manner, itis possible to obtain a mixture in which practically all parameters can be maintained at constant values so that a predetermined mixture of chips is obtained which is macroscopically uniform and which will endow a finished pressed plate with the desired substantially unchanging qualities.
  • the proportioning of the individual chip fractions or size ranges preferably is carried out by volume since the bulk weight or apparent density can be maintained. substantially constant and thus the weight of a given volume of the respective chip fraction will also remain constant.
  • the proportion of wood and thus also the volume of the cavities or interstices in the chip layer Which is to be compressed will remain constant. This can be assured as described above by volumetric proportioning, whereby simultaneously a continuous moisture control of the mixture may be carried out. Such a moisture control hardly could be achieved in any other manner so that any deviations in the moisture content which might occur will become immediately apparent during the proc-
  • the predetermined proportionin-g of the composition of the chip mixture taking into considera tion the qualities of the various w ood types from which the chips are derived, as well as the size ranges of the chips, and the formation of an even, microscopically homogeneous chip mixture will result in the production of pressed plates of substantially unchanging quality.
  • chip layers for compression into pressed plates which with respect to their composition, the properties of the wood thereof, the type of woods, the amount of binder material required and the dimensions of the various chip fractions of the mixture are practically even, so that samples of such chip mixture taken over prolonged periods of production, for instance day by day, will upon analysis show substantially identical properties and dimensions.
  • the chip mixture is so composed that the percentage of the various chip fractions or size ranges will remain constant and that within each size range the distribution of specific chip sizes also remain substantially constant.
  • the very fine wood particles and dust .particles which absorb a relatively large proportion of binder material are used, so to say, as connecting elements for adhering the coarser chips to each other.
  • the very fine wood particles and the wood dust which now is evenly distributed throughout the chip mixture will be used as a carrier of binder material and will make available such binder material upon hot pressing of the chip layer for binding adjacent coarser wood particles to each other.
  • the binder material-containing chip mixture is formed into layers, for subsequent hot pressing, without being sub jected to any sifting such as throw or wind sifting, inasmuch as it is desired to maintain in the chip layer an even and homogeneous distribution of the wood particles of various sizes.
  • the more finely particulate and dust-like rwood particles will absorb a relatively larger quantity of binder material as compared with coarser wood particles. For this reason, it is important to operate in such a manner that during the formation of the layer of binder-containing wood particles the homogeneous size distribution of the wood mixture will not be disturbed so that the very fine wood particles will be evenly distributed throughout the entire layer.
  • Drier 11 includes a sifting device in which coarse, over-sized chips are separated from Referring now to the drawing, the wood arriving at the bulk of the material.
  • the chips withis to serve for the cover or outer layer and the one which drawn 'y QPP 12 are comblnfid Wlth Y further is to serve for the core portion of the pressed plates is Wood ffactlons, Ilamfily the y chips accnllng from then further sorted by wood type and quality. planers 28 and 29, and in accurately controlled propor- By way of example only, the sorting of the wood is tion of grinding dust obtained from grinding machines 32 shown in Table I. and 33.
  • the wood destined to form the outer portions of the pressed plate is processed in the portion of the installation indicated by I, while the.
  • wood destined to form the core portion of the plate is processed in the part of the installation indicated by II.
  • the diiferent wood portions are then stored separately in storage areas 2 and 2a.
  • Fro-m storage areas 2 and 2a, .wood bundles 3 and 3a in the desired proportion of the different qualities are then placed onto chain conveyors 4 and 411 on which the wood passes to band saws 5 and 5a.
  • the saw dust produced in this operation flows through conduit 39 in a continuous manner to processing line 11d of the line on which wood is processed for forming the core portion of the plates.
  • the cut wood pieces pass on a conveyor belt to chip producing machines 6 and 611, wherein the wood :is cut into chips. Splinters formed during this process pass onto conveyor 10.
  • the outer layer-forming chips of processing line I pass from chip producing machine 6 to sifter 7 in which the mixture of chips is separated into large area, medium and fine chips.
  • the large area chips are then further comminuted in mill 8.
  • the medium size and fine chips, as well as the chips which have passed through mill 5 are then jointly passed through conduit 40 into sifter 41.
  • Sifter 41 separates the chip mixture into a regular fraction which will not pass through a screen of 2 mm. mesh width but will pass through a screen of 4 mm. mesh width, and into a fraction of small chips which pass through a screen of 2 mm. mesh width.
  • These separated fractions pass through conduits 42 and 43 into wet hoppers 9 and 44.
  • chips are withdrawn in .the desired predetermined proportions.
  • the controlled withdrawal or dosing of the chips from hoppers 9 and 44 may be carried out by volumetric or gravimetric measurement, however, as has been described further above, preferably, desired volumetric proportions of the difierent chip sizes are withdrawn from the wet hoppers and pass through conduits
  • the chips from planers 28 and 29 pass through conduit 35 into dry chip hopper 12c, and the grinding dust through conduit 53 into dust hopper 12b.
  • Dust hopper 12b has two delivery devices with volumetric delivery control.
  • the controlled volumes of wood components which are withdrawn from hoppers 12, 12b and 120 pass through a joint mixing conduit and from there into a volumetric measuring and dosing device 13 which controls volumetrically the flow of the wood mixture which is to form the outer layers of the pressed plate, for instance so that dm. /min. will be withdrawn from dosing device 13.
  • the thus controlled volume of chip and dust mixture is conveyed over a continuous band scale 14 to binder-applying machine 15 in which a synthetic .resin powder, for instance a urea-formaldehyde powder in water is sprayed onto the wood mixture.
  • the water of the synthetic resin suspension is absorbedby the dry chips and dust, while the synthetic resin powder remains as finely subdivided particles on the surface of the wood.
  • the ,wood mixture will not become adhesive but only somewhat moister when passing through binder-applying machine 15.
  • the wood material which is to serve for forming the core portion of the pressed plates is passed from storage 2a as wood bundles 3a to chain conveyor 4a and to band saw 5a.
  • chine 6a the chip mixture is produced and will pass, with the exception of splinters, to sifter 7a wherein the chip mixture is divided into fractions from which the coarser one .is passed through mill 8b.
  • the splinters separated in chip producing machine 6a pass via collecting conduit 10 into splinter mill 811.
  • the processing line 11b which forms part of the overall processing line II serves for the processing of saw mill waste, i.e. of slabs, splinters and the like.
  • saw mill waste i.e. of slabs, splinters and the like.
  • These waste wood products are combined into bundles 3b and are passed directly into chip forming device 617 and from there with the exception of splinters formed during the chipping operation, into sifter 7b wherein again separation of two fractions takes place and the coarser fraction will be passed to mill 8b.
  • the splinters formed in chip forming device 6b also will be passed via conduits 10 to splinter mill 8a.
  • the processing lines Ho and 11d which also belong to the overall processing line II, serve for the working up of chips and saw dust from outside sources. Depending on whether or not the chips obtained from outside sources are of more or less uniform size, a sifter may or may not the required.
  • the two fractions of chips obtained from outside sources which are indicated by reference numerals 55 and 56 are passed in predetermined proportions relative to each other to sifter 70.
  • the chip mixture is divided in three fractions, namely splinters, coarse chips and chips of desired intermediate size.
  • Wet hoppers 9a-9d serve for conditioning of the chips and for converting the discontinuous input of chips into a continuous output. From wet hoppers 9a9d, the not yet dried flow of chips will pass continuously and at a preferably volumetrically controlled rate evenly through the further processing steps.
  • difierent chip fractions for instance, for formin the core portion of the pressed plates, four fractions, namely saw dust, fine chips, regular size chips and coarse chips.
  • the predetermined chip mixture i.e. a chip mixture which contains predetermined proportions of various chip sizes, and thus formed chip mixture is then passed to drier 11a.
  • the mixture which is introduced to drier 11a will thus always have substantially the same bulk volume and in any given volume of the mixture, the total wood surface area will always be the same, due to the fact that the proportions by volume of coarse, intermediate and fine chips, i.e. the individual chip fractions will be the same due to the exact dosing of the amount of the chip fractions which are withdrawn per unit of time from hoppers 9a- 9d. i
  • the thus formed chip mixture is called a uniform moist chip mixture.
  • the coarse chips which are sepanated in the sitter portion of drier 11 of processing line I pass via conduit 48 into sitter 56 from there through the corresponding hopper onto mixing convey-or 16 and thus to drier 11a.
  • the chip mixture flows into a mixing and dosing hopper 12a. From hopper 12a, the mixture is withdrawn continuously and at an even rate by volume.
  • the thus withdrawn mixture is combined with the also volumeitrically controlled flow of materials from dust hopper 12b.
  • the thus combined flow of wood material now passes through a special volume dosing device 13a in which medium size chips are continuously and in exactly controlled volumetric proportions admixed to the uniform dry chip mixture. From there, the completed chip mixture flows over band scale 14a to binderapplying device 15a.
  • the application of binder material and the subsequent formation of layers of the bindercontaining chip mixtures is controlled by volume.
  • the binder-applying machinery works continuously and with constant quantities of binder material per unit of time, it is possible by introducing a continuous even flow of the mixed chips, to achieve an even specific degree of binder application which is most important for maintaining an even quality of the finished pressed plates.
  • the overflow chips from the dosing device 13a are returned to hopper 12a.
  • the chip mixture which is to form the outer layers of the plate passes over band scale 14 and the chip mixture for the core portions of the plate over a similar band scale 14a.
  • These two plates serve to control and check whether the weight of chip mixture which passes within a unit of time remains constant, i.e. remains uniform. If any change in the weight of the chip mixture which passes per unit of time is noticed, then such variations in the weight indicate a variation in the degree of moisture of the wood or aschange in the specific weight of the wood raw material.
  • the respective chip mixtures After passing through continuous binder-applying machines 15 and 15a in which a suspension of a synthetic resin powder, for instance of urea-formaldehyde resin in water is sprayed :onto the chip mixture, the respective chip mixtures flow to layer-forming'deVice 17 in which layers of the binder-containing chip mixtures are formed on metal sheets which pass through the layer-forming device.
  • the chip mixtures drop as uniform mixtures without separation of particles by size or specific weight in the form of a thin veil over a width of for instance 1.75 meters on the moving metal sheets. It is important according to the present invention and contrary to prior ant methods, that no sifting occurs during the forming of the superposed layers which are to be compressed to a multilayer pressed plate.
  • an outer layer 18 is formed on the moving metal sheet and then one or several core layers 19 and 20 and finally a top layer 21 which will form the other outer layers on the individual metal sheets pass then over scale 22 and thereafter pref era'bly are subjected to a first pressed plate. This portion of the process is described in more detail in my copending application Serial No. 194,449.
  • the crude pressed plates which are formed in heated multilayer press 24 are then immediately laterally trimmed to standard width in contact with automatic circular saw 25.
  • the trimmings i.e. the material which is cut oil the crude pressed plate is then immediately chipped in chip cutter 26.
  • the thus obtained chips and saw dust are continuously passed through conduit 27 into the processing line H, i.e. into sifter 50.
  • the trimmed plates, while still warm, are then passed directly into planing machines 28 and 29 in which both faces of the plates are planed.
  • Turning device 30 is arranged between planing machines 28 and 29.
  • the chips which accrue during the planing of the warm pressed plates are passed through conduit 35 into dry hopper 12c and withdrawn therefrom in volumetrically controlled manner.
  • the planed pressed plates are placed into temporary storage 31 Where they are allowed to stay for several days. Thereafter, the plates are ground on both faces by means of grinders 32 and 33. Here too, turning device 30 is interposed between the two grinding machines. The grinding dust is passed via conduit 53 to dust hopper 12b. After grinding, the now finished pressed plates are placed into storage 34.
  • processing line I serves to produce the chip mixture for forming the outer layers of the pressed plates
  • processing line H is utilized for producing the chip mixture for the core portion of the pressed plate.
  • both processing lines I and II serve for producing uniform wet chip mixtures.
  • the evenly maintained high quality of the pressed plates is specifically controlled in the most economical manner by producing the uniform d-ry chip mixture which is then proportioned exactly as desired in the volume dosing device 13.
  • the chip mixture for the outer and core layers of the pressed plates which now have been superposed as described above, are processed jointly on a so-called forming line up to planing machines 28 and 29.
  • Processing line I also may be subdivided into several parallel lines, somewhat similar to the center line of processing lines II, for instance under conditions where the type of starting material makes it advisable to thus subdivide processing lines 1.
  • the hot pressed crude plates were first placed into storage 31 for cooling and the trimming and grinding was carried out after cooling for instance 7 days, whereby the grinding dust then could be used only for heating purposes or for sealing the cover layer. Due to introduction of planing machines 28 and 29, about half of the grinding dust loss is avoided since according to the described arrangement about 50% of the previously accruing grinding dust is now recovered in the form of useful shavings from the planing operation. However, also the grinding dust which will still accrue is returned into the process as valuable carrier of binder material.
  • the shavings which accrue in the planing operation are of such quality that they can be immediately used as part of the chip mixture for forming the out-er layers of the pressed plate. Consequently, the shavings accruing in planing machines 28 and 29 are continuously, for 'instance pneumatically, conveyed through conduit 35 into dry chip hopper 120.
  • the method as described above does not only permit to utilize the fine chip and ,dust fraction of between 2 and 10% of the finished plate weight which up to now formed waste material of the manufacturing process, but furthermore, the amount of binder material required according to the described method will be between 20 and 30% less than that required according to prior art processes. For instance, instead of 7.5 kg. of resin dry substance per kg. of wood dry weight as customarily used for forming the core layer, it suffices now to use about 5.5 kg. of resin dry substance. This in itself is of very great economical importance and causes a considerable reduction in the manufacturing cost.
  • the amount of binder material which will adhere to the finely subdivided chips and the wood dust equals about 20% of the dry weight of such small wood particles, while the larger chips hold only about 3% of binder material. For this reason, it is so important according to the present invention to ⁇ form the chip layer which is to be compressed of an intimate and even mixture of large and small wood particles and not to separate the components during formation of the layer in layer-forming device 17.
  • the method and arrangement described herein is based on the formation of a controlled uniform chip mixture.
  • various wood types which upon milling or chip production therefrom will give different average chip dimensions are kept separately.
  • These various wood types or chip types include the regular chips which are produced from logs, round timber and split wood; the chips which are produced from saw mill waste such as slab and splinters and the outer portions of logs from which boards can no longer be produced; chips obtained from outside sources which are further milled; saw dust and the grinding dust which accrues in the grinding of the pressed plates.
  • the thus described method makes it possible to produce pressed plates of high and even quality in an installation which is technically simple and economical, and with a minimum of material and labor. Furthermore, it is possible as described above to arrange the processing steps in an easily controllable manner. The process takes into account and can he adjusted in accordance with the type of wood which is used, the specific weight of the wood raw material, the type and configuration of the chips which depend on the manner in which the same are produced, for instance by planing or in a chopper.
  • the dimensions of the chips, the proportion of finely subdivided wood (particularly for the core layer), the even drying, even binder application and even layer formation, as well as the desired specific weight of the finished plate are taken into account as well as conditions which change during operation, such as the blunting of the chopper knives.
  • the example of preferred values is especially for a good pressed plate for furniture, the flakes being cut with a Bezner-Flaker.
  • a method of producing pressed plates by hot pressing mixtures consisting essentially of wood particles of different size ranges and hardenable binder material
  • the improvement which consists in separating said wood particles into portions each of which contains only wood particles of one of said different size ranges; withdrawing from each of said separated portions of difierent size ranges a quantity of each portion which is selected in such a manner that said withdrawn quantities of wood particles of dilferent size ranges, respectively, are in a predetermined proportion relative to each other; forming a first homogeneous mixture of said withdrawn quantities of separated wood particles of different size ranges; intimately mixing said first homogeneous mixture with hardenable binder material so as to form a second mixture adapted to be hot pressed into a pressed plate; and subjecting the thus formed second mixture to hot pressing so as to form a pressed plate thereof.
  • tures consisting essentially of wood particles of different size ranges and hardenable binder material, the improvement which consists in separating the wood particles which are to form each of said superposed layers into portions each of which contains only wood particles of one of said different size ranges; withdrawing from each of said separated portions of different size ranges a volumetric quantity of each portion which is selected in such a manner that said withdrawn volumetric quantities of wood particles of different size ranges, respectively, are in a predetermined volumetric proportion relative to each other; forming a plurality of homogeneous mixtures of withdrawn volumetric quantities of said separated wood particles of different size ranges, each of said plurality of homogeneous mixtures being adapted to term one of said superposed layers of said plurality of superposed layers; drying the thus formed homogeneous mixtures, respectively; intimately mixing a predetermined volumetric proportion of each of the thus dried homogeneous mixtures, respectively, with hardenable binder material so as to form a plurality of latently adhesive mixtures adapted to 'be hot pressed into
  • a method according to claim 3 including the step of continuously weighing said predetermined volumetric proportions of said dried homogeneous mixtures prior to mixing of the same with hardenable binder material.
  • separating means for separating wood particles into different size fractions in combination, separating means for separating wood particles into different size fractions; storage means operatively connected to said separating means for storing the thus separated fractions of wood particles; withdrawal combination, separating means for separating wood particles into different size fractions; storage means operatively connected to said separating means for storing the thus separated fractions of wood particles; drying means for drying the stored separated fractions of wood particles; withdrawal means for withdrawing from said storage means a quantity of each of said different size fractions, respectively, which is selected in such a manner that the thus-withdrawn quantities of wood particles of different size fractions, respectively, are in a predetermined proportion relative to each other; and mixing means for mixing predetermined proportions of the respective dried separated-wood fractions so as to form thereof a homogeneous mixture of wood particles of predetermined size distribution.
  • separating means for separating wood particles into different size fractions; storage means operatively connected to said separating means for storing the thus separated fractions of wood particles; drying means for drying the stored separated fractions of wood par,- tioles; withdrawal means for withdrawing from said storage means a quantity of each of said different size fractions, respectively, which is selected in such a manner that the thus-withdrawn quantities of wood particles of difiere ent size fractions, respectively, are in a predetermined proportion relative to each other; and mixing means for mixing said withdrawn quantities of the respective dried separated wood fractions so as to form thereof a homogeneous mixture of wood particles of predetermined size distribution.

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  • 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)
US210524A 1961-07-19 1962-07-17 Method and apparatus for producing pressed plates Expired - Lifetime US3283048A (en)

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CH846161A CH401465A (de) 1961-07-19 1961-07-19 Verfahren zum Herstellen von Spanplatten und Anlage zur Durchführung des Verfahrens

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959195A (en) * 1970-04-24 1976-05-25 Ab Karlstadplattan Fractionated sawdust chipboard and method of making same
US20040202857A1 (en) * 2003-04-09 2004-10-14 Larry Singer Method of manufacturing composite board
CN102225568A (zh) * 2010-07-30 2011-10-26 梁明祥 一种木塑环保板材的加工工艺及其专用设备
WO2017207448A1 (de) * 2016-05-31 2017-12-07 Dieffenbacher GmbH Maschinen- und Anlagenbau Anlage und verfahren zur herstellung einer werkstoffplatte
WO2018215401A1 (de) * 2017-05-22 2018-11-29 Dieffenbacher GmbH Maschinen- und Anlagenbau Verfahren und anlage zur herstellung einer spanplatte
EP4656343A1 (de) * 2024-05-27 2025-12-03 MOOW Denmark ApS Verfahren zur herstellung eines verbundelements mit weidebaum und durch solch ein verfahren hergestelltes verbundelement

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US2673370A (en) * 1951-08-17 1954-03-30 Sheetwood Products Company Method of manufacturing sheet lumber
US2697254A (en) * 1950-03-14 1954-12-21 Bruce A Gordon Dry process of manufacturing pressboard
US2700796A (en) * 1950-09-14 1955-02-01 Roman Charles Method of and means for making artificial wood products
US2743758A (en) * 1950-11-13 1956-05-01 Cascades Plywood Corp Fiber mat forming apparatus and methods
US2744045A (en) * 1954-05-13 1956-05-01 Peoples Res And Mfg Company Apparatus and process for continuously feeding and spraying wood wool and like materials
US2746895A (en) * 1951-06-19 1956-05-22 Wood Conversion Co Manufacture of fibrer felts
US2992152A (en) * 1959-09-25 1961-07-11 Chapman Ralph Method of forming a board product
US3011938A (en) * 1957-11-18 1961-12-05 Wood Processes Oregon Ltd Process of making board products
US3098781A (en) * 1960-01-18 1963-07-23 Metallwerk Bahre K G Apparatus for producing wood particle boards

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GB644034A (en) * 1947-07-04 1950-10-04 Airscrew Company Ltd A process for the production of composite board from waste wood
US2697254A (en) * 1950-03-14 1954-12-21 Bruce A Gordon Dry process of manufacturing pressboard
US2700796A (en) * 1950-09-14 1955-02-01 Roman Charles Method of and means for making artificial wood products
US2743758A (en) * 1950-11-13 1956-05-01 Cascades Plywood Corp Fiber mat forming apparatus and methods
US2746895A (en) * 1951-06-19 1956-05-22 Wood Conversion Co Manufacture of fibrer felts
US2673370A (en) * 1951-08-17 1954-03-30 Sheetwood Products Company Method of manufacturing sheet lumber
US2744045A (en) * 1954-05-13 1956-05-01 Peoples Res And Mfg Company Apparatus and process for continuously feeding and spraying wood wool and like materials
US3011938A (en) * 1957-11-18 1961-12-05 Wood Processes Oregon Ltd Process of making board products
US2992152A (en) * 1959-09-25 1961-07-11 Chapman Ralph Method of forming a board product
US3098781A (en) * 1960-01-18 1963-07-23 Metallwerk Bahre K G Apparatus for producing wood particle boards

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959195A (en) * 1970-04-24 1976-05-25 Ab Karlstadplattan Fractionated sawdust chipboard and method of making same
US20040202857A1 (en) * 2003-04-09 2004-10-14 Larry Singer Method of manufacturing composite board
US7022756B2 (en) * 2003-04-09 2006-04-04 Mill's Pride, Inc. Method of manufacturing composite board
US20060145384A1 (en) * 2003-04-09 2006-07-06 Larry Singer Method of manufacturing composite board
US7459493B2 (en) * 2003-04-09 2008-12-02 Mill's Pride, Inc. Method of manufacturing composite board
CN102225568B (zh) * 2010-07-30 2013-11-06 梁明祥 一种木塑环保板材的加工工艺及其专用设备
CN102225568A (zh) * 2010-07-30 2011-10-26 梁明祥 一种木塑环保板材的加工工艺及其专用设备
WO2017207448A1 (de) * 2016-05-31 2017-12-07 Dieffenbacher GmbH Maschinen- und Anlagenbau Anlage und verfahren zur herstellung einer werkstoffplatte
CN107443536A (zh) * 2016-05-31 2017-12-08 迪芬巴赫机械工程有限公司 用于生产材料板的设备和方法
CN107443536B (zh) * 2016-05-31 2022-11-01 迪芬巴赫机械工程有限公司 用于生产材料板的设备和方法
WO2018215401A1 (de) * 2017-05-22 2018-11-29 Dieffenbacher GmbH Maschinen- und Anlagenbau Verfahren und anlage zur herstellung einer spanplatte
EP4656343A1 (de) * 2024-05-27 2025-12-03 MOOW Denmark ApS Verfahren zur herstellung eines verbundelements mit weidebaum und durch solch ein verfahren hergestelltes verbundelement
WO2025247894A1 (en) * 2024-05-27 2025-12-04 Moow Denmark Aps Method of manufacturing a composite element comprising willow tree and composite element made by such a method

Also Published As

Publication number Publication date
GB983396A (en) 1965-02-17
CH401465A (de) 1965-10-31
AT258557B (de) 1967-12-11
SE310259B (de) 1969-04-21

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