CA1101254A - Apparatus for making fiberboard - Google Patents
Apparatus for making fiberboardInfo
- Publication number
- CA1101254A CA1101254A CA320,514A CA320514A CA1101254A CA 1101254 A CA1101254 A CA 1101254A CA 320514 A CA320514 A CA 320514A CA 1101254 A CA1101254 A CA 1101254A
- Authority
- CA
- Canada
- Prior art keywords
- fiber layer
- layer making
- conveyor
- flow passage
- raw material
- 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
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
- D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
Landscapes
- Paper (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Nonwoven Fabrics (AREA)
- Stringed Musical Instruments (AREA)
- Food-Manufacturing Devices (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides an apparatus for making a fiberboard comprising an endless belt type fiber layer making conveyor arranged to have an inclined running portion extending over a desired length, a suction box provided along an under surface of the inclined running portion of the fiber layer making conveyor to form a fiber layer making section, and a flow passage for slurry raw material fibers provided along an upper surface of the fiber layer making conveyor in the fiber layer making section which flow passage is so arranged that the flow of slurry raw material fibers flowing through the flow passage reverses its direction or exit from said passage to flow along the surface of the fiber layer making conveyor at a different speed from the running speed of the fiber layer making conveyor.
The present invention provides an apparatus for making a fiberboard comprising an endless belt type fiber layer making conveyor arranged to have an inclined running portion extending over a desired length, a suction box provided along an under surface of the inclined running portion of the fiber layer making conveyor to form a fiber layer making section, and a flow passage for slurry raw material fibers provided along an upper surface of the fiber layer making conveyor in the fiber layer making section which flow passage is so arranged that the flow of slurry raw material fibers flowing through the flow passage reverses its direction or exit from said passage to flow along the surface of the fiber layer making conveyor at a different speed from the running speed of the fiber layer making conveyor.
Description
i4 The present invention relates to such an apparatus for making a fiberboard which is suitably used, for instance, as a wallboard for building and which is of the type comprising a ..
belt type fiber layer making conveyor which is permeable to air and water, such as a wire net or a fibrous material, such as .
:~ felt, is arranged to run endlessiy. The wire net or felt is adapted to carry a desired thickness of slurry raw material fibers comprising a suitable length of vegetable, mineral or syn-thetic fibers or fibers mixed with an adhesive agent, such as cement.
The present invention provides an apparatus for facilitating continuous making of a fiberboard which has the ;~
raw material fibers arranged in order in tbe longitudinal direction thereof, is resistant to bending or breaking forces, and has at least one good quality surface on which the fibers are arranged in order in the longitudinal direction.
The present invention also facilitates making of a fiberboard which is of great thickness and has the fibers orderly arranged in the longitudinal direction for increase in strength and for which both surfaces thereof are of good quality. The present invention also obtains a fiberboard of greater thickness -in such a manner that an intermediate layer is interposed between the fiber layers for the purpose of increasing in quantity. The present invention further makes a fiberboard which has a uniform thickness throughout the whole area thereof free from concavo- ;
convex portions. ;
Accordingly the present invention provides an apparatus for making a fiberboard comprising an endless belt type fiber layer making conveyor arranged to have an inclined running portion extending over a desired length, a suction box provided along an under surface of the inclined running portion of the fiber layer making conveyor to form a fiber. layer making section and a flow passage for slurry raw material fibers provided along ...
." ., i ll~lZS4 an upper surface of the fiber layer making conveyor in the fiber layer making section, which flow passage is so arranged that the flow of slurry raw material fibers flowing through the flow ; passage reverses its direction or exit from said passage to flow alony the surface of the fiber layer making conveyor at a different speed from the running speed of the fiber layer making ~;
conveyor.
The invention will now be described in more detail, by way o~ example only with reference to the accompanying drawings in which:-Fig. 1 is a sectional side view of an apparatusaccording to one embodiment of the present invention;
Fig. 2 is a sectional side view of an important section of an apparatus according to a further embodiment of the present invention;
Fig. 3 is a cross sectional view of the apparatus of Fig. 2;
Fig. ~ is a sectional side view of an important section ; of an apparatus according to another embodiment of the present - 20 invention;
Figs. 5 and-6 are sectional side views of important sections of apparatus according to even fur-ther embodiments of the present invention;
Fig. 7 cross sectional views of fiberboards;
Fig. 8 is a front view, partly in section, of part of a suction box section having a suction force adjusting means, Fig. 9 is a sectional front view of a suction box section in Fig. 8 according to another embodiment of the present invention, and;
Fig. 10 is a longitudinally sectional side view of the suction box of Fig. 9.
Referring to Fig. 11 a belt type fiber layermaking
belt type fiber layer making conveyor which is permeable to air and water, such as a wire net or a fibrous material, such as .
:~ felt, is arranged to run endlessiy. The wire net or felt is adapted to carry a desired thickness of slurry raw material fibers comprising a suitable length of vegetable, mineral or syn-thetic fibers or fibers mixed with an adhesive agent, such as cement.
The present invention provides an apparatus for facilitating continuous making of a fiberboard which has the ;~
raw material fibers arranged in order in tbe longitudinal direction thereof, is resistant to bending or breaking forces, and has at least one good quality surface on which the fibers are arranged in order in the longitudinal direction.
The present invention also facilitates making of a fiberboard which is of great thickness and has the fibers orderly arranged in the longitudinal direction for increase in strength and for which both surfaces thereof are of good quality. The present invention also obtains a fiberboard of greater thickness -in such a manner that an intermediate layer is interposed between the fiber layers for the purpose of increasing in quantity. The present invention further makes a fiberboard which has a uniform thickness throughout the whole area thereof free from concavo- ;
convex portions. ;
Accordingly the present invention provides an apparatus for making a fiberboard comprising an endless belt type fiber layer making conveyor arranged to have an inclined running portion extending over a desired length, a suction box provided along an under surface of the inclined running portion of the fiber layer making conveyor to form a fiber. layer making section and a flow passage for slurry raw material fibers provided along ...
." ., i ll~lZS4 an upper surface of the fiber layer making conveyor in the fiber layer making section, which flow passage is so arranged that the flow of slurry raw material fibers flowing through the flow ; passage reverses its direction or exit from said passage to flow alony the surface of the fiber layer making conveyor at a different speed from the running speed of the fiber layer making ~;
conveyor.
The invention will now be described in more detail, by way o~ example only with reference to the accompanying drawings in which:-Fig. 1 is a sectional side view of an apparatusaccording to one embodiment of the present invention;
Fig. 2 is a sectional side view of an important section of an apparatus according to a further embodiment of the present invention;
Fig. 3 is a cross sectional view of the apparatus of Fig. 2;
Fig. ~ is a sectional side view of an important section ; of an apparatus according to another embodiment of the present - 20 invention;
Figs. 5 and-6 are sectional side views of important sections of apparatus according to even fur-ther embodiments of the present invention;
Fig. 7 cross sectional views of fiberboards;
Fig. 8 is a front view, partly in section, of part of a suction box section having a suction force adjusting means, Fig. 9 is a sectional front view of a suction box section in Fig. 8 according to another embodiment of the present invention, and;
Fig. 10 is a longitudinally sectional side view of the suction box of Fig. 9.
Referring to Fig. 11 a belt type fiber layermaking
2~q~
conveyor lpasses endlessly between and around guide rolls 2 and is arranged to be driven in the direction shown by an arrow. A
portion is an inclined running portion and a suction surface of a suction box 3 is disposed along an under surface of the inclined running portion to form an inclined fiber layer maklng section 4. A flow passage 5 for slurry raw material fibers is disposed along an upper surface of the fiber layer making conveyor 1 where at the inclined fiber layer making section ~ is located, and is defined by la-teral walls 26 on both sides thereof. A
front supply opening 8 of a supply duct 6 which is connected to a raw material source tank 7 positioned at a level sufficiently high to provide a sufficient pressure head, is positioned to be open at an upper portion of the inclination of the flow passage 5. Accordingly, the slurry raw material fibers flowing out from the supply opening 8 flow down along the inclination of the flow passage 5, and consequently the flow direction thereof is opposite to the running direction of the fiber layer making conveyor 1, and this means that the raw material fibers flow down at a speed dif er~nt from the running speed of the fiber layer makin~ conveyor 1. In the course of this flow, the water content thereof is removed by suction rom the suction box 3, and conse~uently the fibers are attached onto the conveyor 1 and are formed into a layer of a predetermined thickness forming a sheet fiber layer. !
This sheet fiber layer is conveyed forwardly by further movement of the fiber layer making conveyor 1, and is thereafter removed from the fiber layer making conveyor 1 at the other end thereof by a stripping member 9, and subsequently the same is transferred onto and is discharged by a delivery belt 10 and thereafter is subjected to any necessary subsequent steps, such as cutting,into a proper length, pressing with or without heating, and drying and thus there can be produced a fiberboard.
, ! ~., I ' .
LZ~
The remainder of the slurry raw material fibers flowing down through the flow passage 5 passes into a discharge tube 11 for recovery, and an excess of the slurry raw material fibers flowing forwardly from the supply opening 8 is turned back towards the discharge tube 11 by the action of a brush roll 12, and ; these recovered materials are returned to the raw material source tank 7 for reuse as the occasion demands.
Referring again Figure 1, an air blowing chamber 13 and an air suction chamber 14 are disposed to face each other on the oppositesurfaces of the fiber layer, and these serve to expel and remove the water from the layer by the blowing air. A stirrer 15, such as a roll with fins, is disposed in the supply tube 6, and serves to prevent the fibers in the slurry liquid from precipitating and the density dis-tribution of the fibers from becoming non-uniform.
Where a sheet of fibrous material such as felt is used as the fiber layer making conveyor 1, to avoid frictional wear with the surface of the suction box 3 when under suction and to avoid roughrunning due to frictional resistance, an air-perme- -able endless, such as a wire net, which does not hinder the suction is so interposed between the fiber layer maXing conveyor 1 and the suction surface of the suction box 3 as to run along with the conveyor 1.
In the ap~aratus as described above, the fibers in the slurry raw material flowing out from the supply opening 8 which is open at its upper portion of the inclined flow passage 5 are dispersed in the liquid freely in random direction, but in the course of flowing down along the slope of the flow passage 5, the fibers are automatically arranged in order along the flow direction, and additionally, when the flowing ~ibers are attracted at their respective one ends by the suction operation of the suction box 3, to the surface of the fiber layer making conveyor 1 or to the surface of the fiber layers previously formed, these fibers are laid down along on the surface of the fiber layer making conveyor 1 due to the difference in speed between the fiber layer making conveyor 1 and the fibers. Consequently, almost all of the fibers are orderly arranged in the running direction of the fiber layer making conveyor 1 and the fiber layer is formed in this manner, so that a fiberboard is formed which is extremely tough against bending forces and tensile forces, in ~;
relation to the fiber direction and its surface with which the fiber layer making conveyor 1 has been in contact has the fibers are arranged in order in the same direction and a very beautiful surface is obtained. Thus, there may be produced such a fiberboard that is suitable for a wallboard for buildings or the like.
In addition, the fiber layer making section 4 is so arranged as to be inclined and the flow passage 5 for the slurry raw material fibers is provided along the same, and therefore simply by supplying the slurry ra~ material fibers from the upper side without using any power source, the slurry raw material fibers can be run down the fiber layer making section 4 so that the slurry raw material fibers are supplied at a speed different from the running speed of the fiber layer making conveyor 1. The apparatus is therefore considerably simplified.
The slurry raw material fibers may be any conventional ones. For instance, the same comprises the fibers alone in water or a mixture of fibers and at least one adhesive agent such as cement, powdered Plas~er or thermosetting synthetic resin in water. The composition ratio of the slurry raw material fibers, for instance, is wood pulp fibers of 2% in weight and water of 98~% in weight, or is 7 ~ 15% in weight of one or more kind of fibers, such as wood pulp, glass fibers, rock wool and synthetic fibers and 93 ~ 85% of water. If desired, inorganic or mineral :x -5-2S~ :
powders may be added thereto as a filling agent.
Fig. 2 shows a modified apparatus of this invention for making a fiberboard of larger thickness. The inclined fiber layer making section 4 in Fi~ure 1 is a lower one, and there is `~
provided above the same, through the flow passage 5, another fiber layer making section 19 comprising a fiber layer making conveyor 17 arranged to run endlessly and a suction bo~ 18.
Respective fiber layers may be made by the upper and lower fiber layer making sections 4, 19 and be placed one upon the other to integrally form a sheet of fiberboard of very large thickness.
Additionally, the slurry raw material fibers are supplied from the supply duct 6 in the center of the flow passage 5 and the front end supply opening 8 is positioned to ~e open at the upper portion of the inclination of the flow passage 5, and consequently the raw material fibers flowing out from the supply opening 8 are diverged upwardly and downwardly to flow down along on the respective fiber layer making sections 4, 19.
The arrangement for supplying the slurry raw material fibers can be so modified as shown in Fig. 4. In particular, a partition wall 20 for dividing into upper and lower portions :
is interposed in the flow passage 5, and the upper portion flow passage is connected to the supply duct 6 for use also as a raw material supply passage. Thus, the slurry raw material fibers are supplied upwardly into the upper portion flow passage from the lower end thereof and thereafter are turned to flow down from the upper end thereof into the inclined lower portion flow passage, so that respective fiber layers may be made in.the :
upper and lower fiber layer making sections 4, 19. In this case, the flow speed of the slurry raw material fibers flowing lnto the upper portion flow passage from the lower end thereof is differentiated from the running speed of the fiber layer making section 19.
~`') ~ 6-Referring to Figs. 2 and 4, a ravelling means 21 comprising a rooler wlth fins is provided in front of the flow passage 5, and serves to prevent the flowing raw material fibers becoming entangled into a lump and mixed in the layer. A suction chamber 22 is provided transversely along the width direction between the upper and lower fiber layers further in front of the flow passage 5, and a transversely e~tending suction opening 23 thereof is open against the fiber layer making direction, and thus serves such that a part of the raw material fibers flowing forwardly is forced to flow into the same and is thereafter flown out sideways, whereby the amounts of the raw material fibers ~;
flowing to the upper and lower fiber layer making sections 4, 19 are adjusted foradjusting the thickness of each layer. Additionally, ~he random distribution of the raw material fibers l in their direction interposed between the upper and lower resulting in layers causing a lowering of the bending strength of the fiberboard by the interposition thereof can ke minimized.
Figs. 5 and 6 each shows a modified embodiment of the apparatus of the present inven-tion for making a fiberboard of much larger thickness. In particular, in each case, separately from the supply line for the slurry raw material fibers supplying to the flow passage 5 for the upper and lower fiber layer making sections 4, l9, another supply line for supplying any slurry raw material fibers of the same or different kind is provided so that an intermediate layer may be formed be-tween the upper and lower fiber layers. In the embodiment shown in Fig. 5, as for one supply line for supplying the raw material fibers for forming the intermediate layer, a subsidiary supply duct 24 is located in the supply duct 6 to form into a subsidiary supply passage therein, and a front end supply opening 25 thereof is positioned to be open ahead of the supply opening 8 of the supply duct 6.
In the embodiment shown in Fig. 6, the subsidiary supply duct 24 s~
is provided transversely in the width direction between the upper and lower layers in front of the flow passage S, and the supply opening 25 is open to direct forwardly. I'hus, by supplying the slurry raw material fibers through the subsidiary supply duct 24 a predetermined thickness of the in-termediate fiber layer is formed between the upper and lower fiber layers, and accordingly a sheet of fiberboard of an especially large thickness can be obtained. If any economical raw material only for che purpose of increasing the bulk is used for preparing for the intermediate layer, the fiberboard of a very large thickness can be obtained economically. For this purpose, for instance, fibers cheaper than the fibers used for the fiber layer making, or/and any fibers of inorganic or organic powders may be used. If the adhesive agent such as cement mixed in the slurry raw material fibers for the intermediate layer is increased, that intermediate layer serves as a medium for strengthening the binding between the upper and lower layers and additionally serves to increase the strength of the whole of the fiberboard.
- 20 Fig. 7 shows cross sectional views of the produced fiberboards. Fib. 7 I shows one comprising a single fiber layer A and produced by the apparatus as shown in Fig. 1, Fig. 7 II
shows one comprising the integral upper and lower layers A, A
and produced by the apparatus as shown in Fig. 2 or 4, and Fig.
7 III shows one comprising such integral three layers with an intermediate layer B is interposed between the upper and lower layers A, A and produced by the apparatus as shown in Fig. 5 or ~.
As shown in these cross sectional views, it is ideal that the fiberboard is substantially uniform in thickness at every portion without any unevenness. However, there is actually often produced various products varied in thickness of the fiber layer due to a partially unequal suction force at the time of ~ ~12S4 ~naking due for example, to clogging of the suction openings of the suction box or that of the permeability of the fiber layer making conveyor, and it happens for instance that the resultant l~yer becomes a concave one, a convex one or an irregular concave and convex one as shown in Figs. 7 IV, V, ~I.
For correcting such unequality of thickness as above, according to this invention, the suction force of -the suc-tion box may be adjusted at individual portions in the transverse direction of the fiber layer, so as to adjust the fiber layer thickness to become unlform.
As one example of such an adjusting means, as shown in Fig. 8, the interior of the suction box 30 is divided by partition walls 31 into a plurality of suction chambers 32 aisposed in the transverse dlrec-tion of the fiber layer, and the respective chambers 32 are in communication, in parallel one w1th another, with a suction tube 34 through respective connecting ~ !
tubes 33, and each connecting tube 33 is provided therein with each adjusting valve 35, so that by selectively adjusting these valves 35 the distribution of the suction force at the front surface of the suction box 30 can be adjusted at individual parts in the width direction thereof.
Figs. 9 and lO disclose another example of the suction force adjusting means. In such an arrangement that the interior of the suction box 30 is divided by the partition walls 31 into a plurality of suction chambers 32 disposed in the wid-th direction thereof, and each suction chamber 32 is connected through the connecting tube 33 to the suction tube 34 as mentioned before. A perforation plate 3~ is so provided in each suction chamber 32 so as to move slidably by means of a rod 37, so that there can be varied by a slide movement thereof, the opening area depending on the overlapping degree of suction openings 38 in the front surface of the suction chamber 32 and openings 39 ': ~_, ) :
of the perforation plate 36 is varied, and thereby each suetion chamber 32 is adjusted as diversely in its suction foree.
By using -the suction box having the foregoing suetion foree adjusting meehanism, the thiekness in the width direetion of the layer can he corrected at will and there can be obtained the layer which is uniform in thiekness at every portion.
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conveyor lpasses endlessly between and around guide rolls 2 and is arranged to be driven in the direction shown by an arrow. A
portion is an inclined running portion and a suction surface of a suction box 3 is disposed along an under surface of the inclined running portion to form an inclined fiber layer maklng section 4. A flow passage 5 for slurry raw material fibers is disposed along an upper surface of the fiber layer making conveyor 1 where at the inclined fiber layer making section ~ is located, and is defined by la-teral walls 26 on both sides thereof. A
front supply opening 8 of a supply duct 6 which is connected to a raw material source tank 7 positioned at a level sufficiently high to provide a sufficient pressure head, is positioned to be open at an upper portion of the inclination of the flow passage 5. Accordingly, the slurry raw material fibers flowing out from the supply opening 8 flow down along the inclination of the flow passage 5, and consequently the flow direction thereof is opposite to the running direction of the fiber layer making conveyor 1, and this means that the raw material fibers flow down at a speed dif er~nt from the running speed of the fiber layer makin~ conveyor 1. In the course of this flow, the water content thereof is removed by suction rom the suction box 3, and conse~uently the fibers are attached onto the conveyor 1 and are formed into a layer of a predetermined thickness forming a sheet fiber layer. !
This sheet fiber layer is conveyed forwardly by further movement of the fiber layer making conveyor 1, and is thereafter removed from the fiber layer making conveyor 1 at the other end thereof by a stripping member 9, and subsequently the same is transferred onto and is discharged by a delivery belt 10 and thereafter is subjected to any necessary subsequent steps, such as cutting,into a proper length, pressing with or without heating, and drying and thus there can be produced a fiberboard.
, ! ~., I ' .
LZ~
The remainder of the slurry raw material fibers flowing down through the flow passage 5 passes into a discharge tube 11 for recovery, and an excess of the slurry raw material fibers flowing forwardly from the supply opening 8 is turned back towards the discharge tube 11 by the action of a brush roll 12, and ; these recovered materials are returned to the raw material source tank 7 for reuse as the occasion demands.
Referring again Figure 1, an air blowing chamber 13 and an air suction chamber 14 are disposed to face each other on the oppositesurfaces of the fiber layer, and these serve to expel and remove the water from the layer by the blowing air. A stirrer 15, such as a roll with fins, is disposed in the supply tube 6, and serves to prevent the fibers in the slurry liquid from precipitating and the density dis-tribution of the fibers from becoming non-uniform.
Where a sheet of fibrous material such as felt is used as the fiber layer making conveyor 1, to avoid frictional wear with the surface of the suction box 3 when under suction and to avoid roughrunning due to frictional resistance, an air-perme- -able endless, such as a wire net, which does not hinder the suction is so interposed between the fiber layer maXing conveyor 1 and the suction surface of the suction box 3 as to run along with the conveyor 1.
In the ap~aratus as described above, the fibers in the slurry raw material flowing out from the supply opening 8 which is open at its upper portion of the inclined flow passage 5 are dispersed in the liquid freely in random direction, but in the course of flowing down along the slope of the flow passage 5, the fibers are automatically arranged in order along the flow direction, and additionally, when the flowing ~ibers are attracted at their respective one ends by the suction operation of the suction box 3, to the surface of the fiber layer making conveyor 1 or to the surface of the fiber layers previously formed, these fibers are laid down along on the surface of the fiber layer making conveyor 1 due to the difference in speed between the fiber layer making conveyor 1 and the fibers. Consequently, almost all of the fibers are orderly arranged in the running direction of the fiber layer making conveyor 1 and the fiber layer is formed in this manner, so that a fiberboard is formed which is extremely tough against bending forces and tensile forces, in ~;
relation to the fiber direction and its surface with which the fiber layer making conveyor 1 has been in contact has the fibers are arranged in order in the same direction and a very beautiful surface is obtained. Thus, there may be produced such a fiberboard that is suitable for a wallboard for buildings or the like.
In addition, the fiber layer making section 4 is so arranged as to be inclined and the flow passage 5 for the slurry raw material fibers is provided along the same, and therefore simply by supplying the slurry ra~ material fibers from the upper side without using any power source, the slurry raw material fibers can be run down the fiber layer making section 4 so that the slurry raw material fibers are supplied at a speed different from the running speed of the fiber layer making conveyor 1. The apparatus is therefore considerably simplified.
The slurry raw material fibers may be any conventional ones. For instance, the same comprises the fibers alone in water or a mixture of fibers and at least one adhesive agent such as cement, powdered Plas~er or thermosetting synthetic resin in water. The composition ratio of the slurry raw material fibers, for instance, is wood pulp fibers of 2% in weight and water of 98~% in weight, or is 7 ~ 15% in weight of one or more kind of fibers, such as wood pulp, glass fibers, rock wool and synthetic fibers and 93 ~ 85% of water. If desired, inorganic or mineral :x -5-2S~ :
powders may be added thereto as a filling agent.
Fig. 2 shows a modified apparatus of this invention for making a fiberboard of larger thickness. The inclined fiber layer making section 4 in Fi~ure 1 is a lower one, and there is `~
provided above the same, through the flow passage 5, another fiber layer making section 19 comprising a fiber layer making conveyor 17 arranged to run endlessly and a suction bo~ 18.
Respective fiber layers may be made by the upper and lower fiber layer making sections 4, 19 and be placed one upon the other to integrally form a sheet of fiberboard of very large thickness.
Additionally, the slurry raw material fibers are supplied from the supply duct 6 in the center of the flow passage 5 and the front end supply opening 8 is positioned to ~e open at the upper portion of the inclination of the flow passage 5, and consequently the raw material fibers flowing out from the supply opening 8 are diverged upwardly and downwardly to flow down along on the respective fiber layer making sections 4, 19.
The arrangement for supplying the slurry raw material fibers can be so modified as shown in Fig. 4. In particular, a partition wall 20 for dividing into upper and lower portions :
is interposed in the flow passage 5, and the upper portion flow passage is connected to the supply duct 6 for use also as a raw material supply passage. Thus, the slurry raw material fibers are supplied upwardly into the upper portion flow passage from the lower end thereof and thereafter are turned to flow down from the upper end thereof into the inclined lower portion flow passage, so that respective fiber layers may be made in.the :
upper and lower fiber layer making sections 4, 19. In this case, the flow speed of the slurry raw material fibers flowing lnto the upper portion flow passage from the lower end thereof is differentiated from the running speed of the fiber layer making section 19.
~`') ~ 6-Referring to Figs. 2 and 4, a ravelling means 21 comprising a rooler wlth fins is provided in front of the flow passage 5, and serves to prevent the flowing raw material fibers becoming entangled into a lump and mixed in the layer. A suction chamber 22 is provided transversely along the width direction between the upper and lower fiber layers further in front of the flow passage 5, and a transversely e~tending suction opening 23 thereof is open against the fiber layer making direction, and thus serves such that a part of the raw material fibers flowing forwardly is forced to flow into the same and is thereafter flown out sideways, whereby the amounts of the raw material fibers ~;
flowing to the upper and lower fiber layer making sections 4, 19 are adjusted foradjusting the thickness of each layer. Additionally, ~he random distribution of the raw material fibers l in their direction interposed between the upper and lower resulting in layers causing a lowering of the bending strength of the fiberboard by the interposition thereof can ke minimized.
Figs. 5 and 6 each shows a modified embodiment of the apparatus of the present inven-tion for making a fiberboard of much larger thickness. In particular, in each case, separately from the supply line for the slurry raw material fibers supplying to the flow passage 5 for the upper and lower fiber layer making sections 4, l9, another supply line for supplying any slurry raw material fibers of the same or different kind is provided so that an intermediate layer may be formed be-tween the upper and lower fiber layers. In the embodiment shown in Fig. 5, as for one supply line for supplying the raw material fibers for forming the intermediate layer, a subsidiary supply duct 24 is located in the supply duct 6 to form into a subsidiary supply passage therein, and a front end supply opening 25 thereof is positioned to be open ahead of the supply opening 8 of the supply duct 6.
In the embodiment shown in Fig. 6, the subsidiary supply duct 24 s~
is provided transversely in the width direction between the upper and lower layers in front of the flow passage S, and the supply opening 25 is open to direct forwardly. I'hus, by supplying the slurry raw material fibers through the subsidiary supply duct 24 a predetermined thickness of the in-termediate fiber layer is formed between the upper and lower fiber layers, and accordingly a sheet of fiberboard of an especially large thickness can be obtained. If any economical raw material only for che purpose of increasing the bulk is used for preparing for the intermediate layer, the fiberboard of a very large thickness can be obtained economically. For this purpose, for instance, fibers cheaper than the fibers used for the fiber layer making, or/and any fibers of inorganic or organic powders may be used. If the adhesive agent such as cement mixed in the slurry raw material fibers for the intermediate layer is increased, that intermediate layer serves as a medium for strengthening the binding between the upper and lower layers and additionally serves to increase the strength of the whole of the fiberboard.
- 20 Fig. 7 shows cross sectional views of the produced fiberboards. Fib. 7 I shows one comprising a single fiber layer A and produced by the apparatus as shown in Fig. 1, Fig. 7 II
shows one comprising the integral upper and lower layers A, A
and produced by the apparatus as shown in Fig. 2 or 4, and Fig.
7 III shows one comprising such integral three layers with an intermediate layer B is interposed between the upper and lower layers A, A and produced by the apparatus as shown in Fig. 5 or ~.
As shown in these cross sectional views, it is ideal that the fiberboard is substantially uniform in thickness at every portion without any unevenness. However, there is actually often produced various products varied in thickness of the fiber layer due to a partially unequal suction force at the time of ~ ~12S4 ~naking due for example, to clogging of the suction openings of the suction box or that of the permeability of the fiber layer making conveyor, and it happens for instance that the resultant l~yer becomes a concave one, a convex one or an irregular concave and convex one as shown in Figs. 7 IV, V, ~I.
For correcting such unequality of thickness as above, according to this invention, the suction force of -the suc-tion box may be adjusted at individual portions in the transverse direction of the fiber layer, so as to adjust the fiber layer thickness to become unlform.
As one example of such an adjusting means, as shown in Fig. 8, the interior of the suction box 30 is divided by partition walls 31 into a plurality of suction chambers 32 aisposed in the transverse dlrec-tion of the fiber layer, and the respective chambers 32 are in communication, in parallel one w1th another, with a suction tube 34 through respective connecting ~ !
tubes 33, and each connecting tube 33 is provided therein with each adjusting valve 35, so that by selectively adjusting these valves 35 the distribution of the suction force at the front surface of the suction box 30 can be adjusted at individual parts in the width direction thereof.
Figs. 9 and lO disclose another example of the suction force adjusting means. In such an arrangement that the interior of the suction box 30 is divided by the partition walls 31 into a plurality of suction chambers 32 disposed in the wid-th direction thereof, and each suction chamber 32 is connected through the connecting tube 33 to the suction tube 34 as mentioned before. A perforation plate 3~ is so provided in each suction chamber 32 so as to move slidably by means of a rod 37, so that there can be varied by a slide movement thereof, the opening area depending on the overlapping degree of suction openings 38 in the front surface of the suction chamber 32 and openings 39 ': ~_, ) :
of the perforation plate 36 is varied, and thereby each suetion chamber 32 is adjusted as diversely in its suction foree.
By using -the suction box having the foregoing suetion foree adjusting meehanism, the thiekness in the width direetion of the layer can he corrected at will and there can be obtained the layer which is uniform in thiekness at every portion.
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Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS
1. An apparatus for making a fiberboard comprising an endless belt type fiber layer making conveyor arranged to have an inclined running portion, extending over a desired length, a suction box provided along an under surface of the inclined running portion of the fiber layer making conveyor forming a fiber layer making section, and a flow passage for slurry raw material fibers provided along an upper surface of the fiber layer making conveyor in the fiber layer making section, which flow passage is so arranged that the flow of slurry raw material fibers flowing through the flow passage reverses its direction or exit from said passage to flow along the surface of the fiber layer making conveyor at a different speed from the running speed of the fiber layer making conveyor.
2. An apparatus as claimed in claim 1, wherein the fiber layer making section is provided on the underside of the flow passage, and another fiber layer making section comprising a second endless belt type fiber layer making conveyor and a suction box is provided on the other side of the flow passage so that respective fiber layers may be made by the two fiber layer making sections and thereafter be placed one upon the other so as to integrally form a single sheet of fiberboard.
3. An apparatus as claimed in claim 2, wherein a supply opening for slurry raw material fibers is arranged between the respective fiber layers made by the two fiber layer making sections.
4. An apparatus as claimed in claim 1, 2 or 3, wherein the interior of the or each suction box is divided by partition walls into a plurality of suction chambers disposed in the width direction of the layer, and each suction chamber is provided with a means for adjusting a suction force thereof so as to enable the thickness of the fiber layer to be adjusted.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP885078A JPS54125709A (en) | 1978-01-31 | 1978-01-31 | Apparatus for producing fiberboard |
| JP8850/1978 | 1978-01-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1101254A true CA1101254A (en) | 1981-05-19 |
Family
ID=11704209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA320,514A Expired CA1101254A (en) | 1978-01-31 | 1979-01-30 | Apparatus for making fiberboard |
Country Status (14)
| Country | Link |
|---|---|
| JP (1) | JPS54125709A (en) |
| AT (1) | AT367679B (en) |
| AU (1) | AU508783B2 (en) |
| BE (1) | BE873821A (en) |
| CA (1) | CA1101254A (en) |
| CH (1) | CH638256A5 (en) |
| DE (1) | DE2903275C2 (en) |
| DK (1) | DK148662C (en) |
| FI (1) | FI68187C (en) |
| FR (1) | FR2416101A1 (en) |
| GB (1) | GB2013747B (en) |
| IT (1) | IT1114069B (en) |
| NO (1) | NO149652C (en) |
| SE (1) | SE436370B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3634604C2 (en) * | 1986-10-10 | 1994-11-03 | Babcock Bsh Ag | Device for the continuous molding of mineral slabs, in particular gypsum fiber slabs, from a suspension |
| FI896202A (en) * | 1989-12-22 | 1991-06-23 | Ahlstroem Valmet | METHOD OCH ANORDNING VID INLOPPSLAODAN AV EN PAPPERS-, KARTONG- ELLER TORKMASKIN. |
| US5180471A (en) * | 1991-01-09 | 1993-01-19 | Kimberly-Clark Corporation | Non-nesting multi-ply tissue and method for making same |
| AT405951B (en) * | 1998-02-06 | 2000-01-25 | Andritz Patentverwaltung | METHOD AND DEVICE FOR FORMING FIBER PANELS |
| US7045027B2 (en) * | 2003-03-31 | 2006-05-16 | Matsushita Electric Works, Ltd. | Method of producing a fiber board |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1544042A (en) * | 1920-03-26 | 1925-06-30 | C F Dahlberg | Fiber board of felted interlaced fibers |
| US1661678A (en) * | 1926-07-16 | 1928-03-06 | Price Herbert Theodore | Apparatus for pulp-board making |
| FR1049406A (en) * | 1950-07-05 | 1953-12-29 | Cie De Pont A Mousson | Cement slab filled with fibrous material, improved process and machine for their manufacture |
| AT249493B (en) * | 1963-09-04 | 1966-09-26 | Anton Volpini De Dipl Maestri | Wire section for paper machines |
| FR1417831A (en) * | 1964-12-18 | 1965-11-12 | Feldmuehle Ag | Method and apparatus for the production of extended webs of fibers on the screen of a paper machine |
| DE1473914B2 (en) * | 1965-08-14 | 1970-11-12 | Messerschmitt-Bölkow-Blohm GmbH, 8000 München | Infrared heater |
| US3513069A (en) * | 1966-07-27 | 1970-05-19 | Mead Corp | Method for producing metal fiber webs on a papermaking machine |
| BE758252A (en) * | 1969-11-05 | 1971-04-30 | Freudenberg Carl Fa | FLAT FIBROUS STRUCTURES WITH MICRO-CAPSULES DISTRIBUTED IN A NON-HOMOGENEOUS MANNER, AS WELL AS A MANUFACTURING PROCESS |
| BE757981A (en) * | 1969-11-14 | 1971-04-01 | Neyrpric Bmb | DEVICE FOR DRIFTING A PARTICLE SUSPENSION FOR MAKING A SAIL |
| GB1400530A (en) * | 1972-12-21 | 1975-07-16 | Nat Res Dev | Production of mats of aligned fibres |
-
1978
- 1978-01-31 JP JP885078A patent/JPS54125709A/en active Granted
-
1979
- 1979-01-08 AU AU43202/79A patent/AU508783B2/en not_active Expired
- 1979-01-15 GB GB7901434A patent/GB2013747B/en not_active Expired
- 1979-01-17 FR FR7901075A patent/FR2416101A1/en active Granted
- 1979-01-25 FI FI790248A patent/FI68187C/en not_active IP Right Cessation
- 1979-01-29 NO NO790286A patent/NO149652C/en unknown
- 1979-01-29 DE DE2903275A patent/DE2903275C2/en not_active Expired
- 1979-01-29 IT IT47807/79A patent/IT1114069B/en active
- 1979-01-30 CH CH87079A patent/CH638256A5/en not_active IP Right Cessation
- 1979-01-30 CA CA320,514A patent/CA1101254A/en not_active Expired
- 1979-01-30 SE SE7900805A patent/SE436370B/en not_active IP Right Cessation
- 1979-01-30 DK DK38479A patent/DK148662C/en not_active IP Right Cessation
- 1979-01-31 AT AT0070879A patent/AT367679B/en not_active IP Right Cessation
- 1979-01-31 BE BE193168A patent/BE873821A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6111360B2 (en) | 1986-04-02 |
| GB2013747A (en) | 1979-08-15 |
| FI68187B (en) | 1985-04-30 |
| FR2416101A1 (en) | 1979-08-31 |
| AU508783B2 (en) | 1980-04-03 |
| ATA70879A (en) | 1981-12-15 |
| DK148662C (en) | 1986-04-01 |
| DK148662B (en) | 1985-08-26 |
| DE2903275A1 (en) | 1979-08-02 |
| NO149652B (en) | 1984-02-20 |
| DK38479A (en) | 1979-08-01 |
| IT1114069B (en) | 1986-01-27 |
| FI790248A (en) | 1979-08-01 |
| AU4320279A (en) | 1979-08-30 |
| AT367679B (en) | 1982-07-26 |
| SE436370B (en) | 1984-12-03 |
| GB2013747B (en) | 1982-09-08 |
| NO149652C (en) | 1984-06-06 |
| JPS54125709A (en) | 1979-09-29 |
| FI68187C (en) | 1985-08-12 |
| SE7900805L (en) | 1979-08-01 |
| FR2416101B1 (en) | 1982-12-10 |
| CH638256A5 (en) | 1983-09-15 |
| DE2903275C2 (en) | 1983-03-10 |
| BE873821A (en) | 1979-05-16 |
| IT7947807A0 (en) | 1979-01-29 |
| NO790286L (en) | 1979-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |