CA2094940C - Atomized resin binding method and system for making wood-shaving panels - Google Patents
Atomized resin binding method and system for making wood-shaving panels Download PDFInfo
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- CA2094940C CA2094940C CA002094940A CA2094940A CA2094940C CA 2094940 C CA2094940 C CA 2094940C CA 002094940 A CA002094940 A CA 002094940A CA 2094940 A CA2094940 A CA 2094940A CA 2094940 C CA2094940 C CA 2094940C
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- steam
- resin binding
- binding apparatus
- mixture
- wood
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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
- B27N1/0209—Methods, e.g. characterised by the composition of the 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
- B27N1/02—Mixing the material with binding agent
- B27N1/0227—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer
- B27N1/0236—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer with the stirrers rotating about an horizontal axis, e.g. in consecutive casings
- B27N1/0245—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer with the stirrers rotating about an horizontal axis, e.g. in consecutive casings with a single stirrer shaft
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Laminated Bodies (AREA)
- Reinforced Plastic Materials (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
The present invention relates to an atomized-resin binding method and system for making wood-shaving panels, characterized in that the method com-prises the step of simultaneoulsy subjecting to heat and to an superheated pressurized steam dynamic pulse, the wood-shaving, glue and chemical mixture with a turbulent motion in the resin binding machine, so as to provide an atomized flow of particles having even physical characteristics.
Description
BACKGROUND OF THE INVENTION
The present invention relates to an atomized resin binding method and system for making wood-shaving panels.
There are already known resin binding methods for making wood-shaving panels, which methods are carried out in systems essentially comprising a meter-ing hopper for metering the wood-shavings obtained from dried wood, the hopper supplying with a continuous type of wood shaving flow a ribbon balance which is suspended from a load cell.
The balance continuously sends the value of the weight of the wood shavings supplied to the re-sin binding apparatus to an electronic processor de-vice which, in order to hold the dry glue/dry wood shaving weight ratio constant, as set by the operator, drives the RPM's of a pump which supplies the resin binding apparatus with a glue mixture comprising water, a glue, and a curing paraffin mixture.
For making the panels there are conventional-ly used at least two systems for each panel making line: a system is used for resin binding the fine wood shavings, which will form the surfaces of the panel, whereas the other system is used for resin bind--_ ing the larger size wood shavings which will form the inner portion of the panel.
Downstream of these systems there is provided a further forming system, preferably comprising four forming apparatus arranged with an in-line arrange-ment.
The first forming apparatus is provided for spreading on a forming ribbon or web a first layer of fine resin bond wood shavings, while the second and third forming apparatus are provided for apply-ing two layers of resin bond wood shavings of larger particle size, whereas the fourth forming apparatus is provided for forming the last layer including fine particle wood shavings.
The thus formed "mattress" is entrained, by means of the ribbon or web which is continuously driven under the forming apparatus, inside a conti-nuous pressing. apparatus, comprising two steel rib-boas sliding on two plates which are heated to a temperature which varies from 180°C to 240°C, with the same speed as the forming web or ribbon.
Under the combined effect of pressure and temperature, the resin bond wood shaving mattress is set owing to the curing of the resin, so as to ~~~~~~4~
provide a wood shaving panel.
Such a prior method, on the other hand, is affected by several drawbacks.
In particular, in winter time, the mattress temperature will decrease, with respect to a summer time, of about 20°C, so as to require an increased baking time and, accordingly, an increased operating time of the system, in particular from 4.8 sec/mm to 5.9 sec/mm, for a base thickness of 18 mm of the finished wood shaving panel.
A~further drawback is that, periodically, the operation of the system must be interrupted in order to clean out the resin binding apparatus from resin and wood powder scales.
Yet other drawbacks are a comparatively low resin binding efficiency, and the requirement of using water delivered from refrigerator assemblies operating at about 5°C, in order to cool the resin binding apparatus jackets, since, because of the friction over-heating, the scales tend to set and deposit on the inner walls of these jackets, so as to cause the apparatus to be obstructed.
The mentioned forming apparatus, moreover, are also fouled because of a not optimal distribution of the binding resin on the wood shavings.
Yet another drawback is the requirement of using an expensive paraffin emulsion in order to re-duce the amount of water absorbed by the finished product.
SUMMARY OF THE INVENTION
Accordingly, the aim of the present invention is to overcome the above mentioned drawbacks, by providing such a system and method allowing to great-ly reduce the baking time, with a consequent great increase of the making efficiency, and which do not involve any interruption of the making operation in order to clean the resin binding and forming appa-ratus.
Within the scope of the above mentioned aim, a main object of the present invention is to provide such a resin binding method and system which allow to obtain a very great operating efficiency, with a consequent improvement of the mechanical charac-teristics of the finished wood shaving panel.
Another object of the present invention is to provide such a resin binding method and system providing an improved spreading of the mattress by the forming apparatus,. with consequent improved thick-E
ness tolerances of the raw panels at t:he outlet of the pressing machine.
Yet another object of the present. invention is to provide such a method and system which allow to overcome the requirement of using any paraffin emulsion.
Yet another object of the present invention is to provide such a method and system which do not include refrigerators for cooling the water circula-tion jackets of the resin binding apparatus.
According to one aspect of the present inven-tion, the above mentioned aim anei objects, as well as yet other objects, which will become more appa-rent hereinafter, are achieved by an improved system for making wood shaving panels, characterized in that said system provides for the use of a high tempera-ture fluid which preferably comprises pressurized steam, said fluid being conveyed intr> a resin bind-ing apparatus in order to increase the temperature of the wood shavings, glue materials and chemi-cal aids, which are so mixed as to provide a~ wood shaving panel.
6a More specifically, the present. irnvenf:ion provides a system for maki ng wood ~:havi ng panel s c:ompri si ng feedi ng means for feeding a wood shaving mass and a resin binding apparatus to which the wood shaving mass is supplied to be bound by glue materials and other chemical adjuvanis, wherei n the system further compri ses injector mean s for i n jecti ng a hi gh temperatrare pres ~uar°i geed f 1 ui d i nto the wood shaving means conveyed to the resin binding apparatus to increase the temperature of the wood shaving mass, the g1 ue materi al s and the cl~emi ~a l ad,juvant.s , whi ch are so mixed as to provide a wood shaving panel.
The present i event i on t~l so prvovi des an atomi zed resi n binding method for making wood shaving panfuls, wherein the method comprises the steps of simultaneously supplying heat and an even and di ffused dynami c pul se to a mi xture of wood shavings, glue and chemical adjuvants, subjected to a turbulent motion, produced by a stirrer ope:~rating inside a resin binding apparatus, and providing the heat and dynamic pulse by injecting into the resin binding <apparatus a pressuri zed water steam, t:he steam bei rag super-heated and pre-processed upstream of the loading zone of the mixture, with respect to a feeding direction of the mixture being stirred.
BRIEF DESCRIPTION OF THE DRAWINGS
Further characteristics and advantages of the invention will become more apparent hereinafter from the following detailed disclosure of a preferred, though not exclusive, embodiment thereof, vahich is illustrated, by way of an indicative, but not limi-tative example, in the accompanying drawings, where:
Figure 1 illustrates a schematic diagram of a conventional system for continuously pressing and making wood shaving panels;
Figure 2 illustrates a schematic diagram of a prior resin binding system for making panels;
Figure 3 illustrates a schematic diagram of other parts of a system for continuously making wood shaving panels;
Figure 4 illustrates a schematic diagram of a resin binding system for carrying out the method according to the present invention;
Figure 5 is a schematic cross-sectioned side view illustrating a vessel for steam processing wood shavings according to the invention;
and Figure 6 is a top cross-sectional view illus-trating the above vessel coupled to a steam condensa-to separating device.
DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to the figures of the accompany-ing dravrings, and, more specifically to Figure 2, prior resin binding systemsfor making wood shaving panels conventionally comprise a dry wood shaving metering hopper 1 vrhich supplies with a continuous flow of dry wood shavings a ribbon balance 2, sus-pended from a load cell 3.
The balance 2 is provided for continuously sending the data related to the vreight of the wood shavings supplied to the resin binding apparatus, to an electronic processor, which, in order to hold the dry glue/dry wood shaving weight ratio constant, as it has been set by the operator, will control the RPM's of a pump 5 which supplies the resin binding apparatus 4 with a glue mixture comprising, in parti-cular, water, a glue and a curing paraffin emulsion.
For each layer of the mattress being formed along the making line of the wood shaving panel there are conventionally used one or more resin bind-ing systemsof the above disclosed type.
Some resin apparatus are used for resin bind-ing the fine wood shavings, which will form the out-er surfaces of the panel, and one or more of said g resin binding apparatus will be used for resin bind-ing, the wood shavings having a larger particle size, and which will form the mattress or mattresses provided for forming the inner portion of the panel.
Downstream of the above disclosed apparatus, there is provided a forming system 6 which essential-ly comprises four forming apparatus 7, 8, 9, 10 ar-ranged in an in-line arrangement.
The first forming apparatus 7 is provided for spreading on a forming ribbon 11 a first layer of fine resin bond wood shavings, while the second 8 and third 9 forming apparatus are provided for forming two resin bond wood shaving layers of lar-ger particle size, and, finally, the first forming apparatus 10 is provided for forming the last layer of fine wood shavings.
The thus formed mattress 12 is entrained, by means of the forming ribbon 11 which is continuously driven under the above forming apparatus, inside a continuous pressing apparatus 13 comprising two steel webs or ribbons 14 sliding on heated plates 15 with the same speed as the forming ribbon 11.
Under the combined effect of pressure and temperature, the resin bond wood shaving mattress 12 to is set, owing to the curing of the resin, so as to provide a finished wood shaving panel.
As stated, however, the above prior making method is affected by several drawbacks.
In particular, in winter time, the tempera-ture of the mattress 12 decreases, with respect to the summer time temperature, of about 20°C, thereby involving a corresponding increase of the baking time and, accordingly, of the system operating time from 4.8 sec/mm to 5.9 sec/mm, for a base thickness of 18 mm of the finished wood shaving panel.
With reference to Figure 3, 4, 5 and 6, the nebulized resin binding system and method according to the present invention substantially provide to simultaneously subject to heat and an additional dynamic pulse, of even and diffused nature, the mix-ture of wood shavings, glue and chemical aids which is subjected to a turbulent motion provided by the stirrer 16 operating inside the resin binding appa-ratus 4.
In particular, the. heat is applied by inject-ing pressurized steam (at a preset pressure from 0.1 to 13 bars) and, in a preferred embodiment, the steam is super-heated to a temperature which can be preset by the operator (at 1?_0-2001°C1 <~nd being more-over pre-processed.
This is preferably obtained by means of a steel injector 17, arranged perpendim.nlarly to the flow direction, <~nd proviried with a nozzle having an inner diameter of 8-1() mm, at a distance of about 300 mm from the inlet hopper 18 in the resin binding apparatus, at a short distance upstre<rrn c~f the in-jectors ( not shown ) for 1 oath ng the g1 uei rig m. xture > wi th respect to the material advancement direc:t:ion as impressed by the sti rrer 16.
The mentioned pre-processing is performed in-side a suitable ~>teel c:ylindric vessel., or turbomixer 19, which, according to a preferred, i:hough not ex-clusive,embodiment has an inner diamei:er ~ - 350 mm, a height of about 600 mm and a thickness of about mm.
Thi s turbomi xer vessel 19 cornpri ses t:wo noz-z1 es 20 and 21 vahi c:h are arranged tangenti al 1y of the vessel surface and, in its inside, d4flet::-ing fins 22 and 23.
~1oreover, coupled to the vessel there is pro-vided a condensate separating device 2~, arranged up-stream of the vessel and in which there are separated r the steam fractions which v~ould deposit on the ducts of the system.
hlore specifically, t:he nozzle 20 allows super-heated steam to be introduced into i:he vessel, where-as the nozzle 21 is provided for introducing the several chemical aids or a~ljuvants.
A mixing of the super-heated steam and the chemical adjuvants is performed at the central re-gion of the vessel, because of the provision of the above mentioned deflecting fins 22 and 23 which operate so as to hold t:he chemical <idjuvants sepa-rated from the super-heated steam flow, during the first step in which these adjuvants are conveyed to the vessel for processing the steam.
In particular, the chemical adjuvants com-prise surface active agents, preferably ethylene and methylene glyccles.
These adjuvants are used for modifying the surface condition of the water so as to properly control the thermal balance of this water during the different year seasons, in the pressing step.
f~loreover, there are also used catalyzer sub-stances in order to accelerate tfoe curing of the glueing mixture and there are also used cleansing l:>
sub~;tanc:es.
The latter are used, in toartic:ular, vFor clean-ing all of the downstream arranged apparatus.
There are also a~E~d water-repellent. substances, in order to provide the wood shaving panel with an improved resistance against water.
From the atomized mixture formed as above disclosed, having even physical characteristics and conveyed through said injector 17 into the resin binding apparatus 4, there are transferred the con-densation heat and momentum, by impact, to the dry wood shavings, which are progressively impregnated by the glueing mixture, under the effect of mutual slipping, impacts and of the turbulent motion oc-curring between the several substances introduced into the resin binding apparatus 4.
The main feature of the present invention consists substantially of the injection of the super-heated steam, which allows to achieve sf_~ver<~l great advantages.
Firstly, as it is introduced into the resin binding machine, the steam will expand, so as to heat the glueing mixture and render it more "malle-able".
1 ~~
The steam, moreover, causes the wood pores to also expand, so as to allow the glue and other chemical adjuvants to properly enter these pores.
Accordingly, it is obtained an improved bind-ing efficiency, which will provide the finished wood shaving panel with very good mechanical character-istics, as well as a great resistance against ageing and moisture.
Moreover, the steam provide:; an o~otimal s;pread-ing of the chemical adjuvants throuc3h the mattress, without negatively affecting the catalysis of the binding resin.
The introduction of super-heated steam into the resin binding apparatus, provides moreover a good lubrication of its walls, preventing them from being fouled, and this without t:he requirement of using cooled water, since exclusively tower water at 30°C is used, as necessary for cooling the water jackets of the resin binding apparatus.
Moreover, it is provided to actuate, by means of the steam progressively condensing on the inner wall of the cylindric jacket 4' of the resin bind-ing apparatus 4, lubricating action on the wood shaving 'flow toward .. - 15 the outlet 29 to the forming station 6.
One of the main advantages of the present in-vention is that the steam provides a great reduction of the baking time.
In fact, the super-heated steam will cause, in a very advantageous manner, and mainly in winter time, an increase of the mattress temperature of about 20°C, with a corresponding increase of the operating efficiency of about 20°/, in the term of the amount or yield of made panels.
A further important aspect of the invention is that the disclosed method also allows to obtain a great reduction of the formaldehyde contents of the finished product.
From the above disclosure it should be appa-rent that the invention fully achieves the intended aim and objects.
The invention as disclosed is susceptible to several;modifications and variations, all of which will come within the scope of the inventive idea.
Moreover, all of the details can be replaced by other technically equivalent elements.
In practicing the invention, the used mate-rial, provided that they are compatible to the in-. _ is ~~~494~
tended use, as well as the contingent size and shapes can be any according to requirements.
The present invention relates to an atomized resin binding method and system for making wood-shaving panels.
There are already known resin binding methods for making wood-shaving panels, which methods are carried out in systems essentially comprising a meter-ing hopper for metering the wood-shavings obtained from dried wood, the hopper supplying with a continuous type of wood shaving flow a ribbon balance which is suspended from a load cell.
The balance continuously sends the value of the weight of the wood shavings supplied to the re-sin binding apparatus to an electronic processor de-vice which, in order to hold the dry glue/dry wood shaving weight ratio constant, as set by the operator, drives the RPM's of a pump which supplies the resin binding apparatus with a glue mixture comprising water, a glue, and a curing paraffin mixture.
For making the panels there are conventional-ly used at least two systems for each panel making line: a system is used for resin binding the fine wood shavings, which will form the surfaces of the panel, whereas the other system is used for resin bind--_ ing the larger size wood shavings which will form the inner portion of the panel.
Downstream of these systems there is provided a further forming system, preferably comprising four forming apparatus arranged with an in-line arrange-ment.
The first forming apparatus is provided for spreading on a forming ribbon or web a first layer of fine resin bond wood shavings, while the second and third forming apparatus are provided for apply-ing two layers of resin bond wood shavings of larger particle size, whereas the fourth forming apparatus is provided for forming the last layer including fine particle wood shavings.
The thus formed "mattress" is entrained, by means of the ribbon or web which is continuously driven under the forming apparatus, inside a conti-nuous pressing. apparatus, comprising two steel rib-boas sliding on two plates which are heated to a temperature which varies from 180°C to 240°C, with the same speed as the forming web or ribbon.
Under the combined effect of pressure and temperature, the resin bond wood shaving mattress is set owing to the curing of the resin, so as to ~~~~~~4~
provide a wood shaving panel.
Such a prior method, on the other hand, is affected by several drawbacks.
In particular, in winter time, the mattress temperature will decrease, with respect to a summer time, of about 20°C, so as to require an increased baking time and, accordingly, an increased operating time of the system, in particular from 4.8 sec/mm to 5.9 sec/mm, for a base thickness of 18 mm of the finished wood shaving panel.
A~further drawback is that, periodically, the operation of the system must be interrupted in order to clean out the resin binding apparatus from resin and wood powder scales.
Yet other drawbacks are a comparatively low resin binding efficiency, and the requirement of using water delivered from refrigerator assemblies operating at about 5°C, in order to cool the resin binding apparatus jackets, since, because of the friction over-heating, the scales tend to set and deposit on the inner walls of these jackets, so as to cause the apparatus to be obstructed.
The mentioned forming apparatus, moreover, are also fouled because of a not optimal distribution of the binding resin on the wood shavings.
Yet another drawback is the requirement of using an expensive paraffin emulsion in order to re-duce the amount of water absorbed by the finished product.
SUMMARY OF THE INVENTION
Accordingly, the aim of the present invention is to overcome the above mentioned drawbacks, by providing such a system and method allowing to great-ly reduce the baking time, with a consequent great increase of the making efficiency, and which do not involve any interruption of the making operation in order to clean the resin binding and forming appa-ratus.
Within the scope of the above mentioned aim, a main object of the present invention is to provide such a resin binding method and system which allow to obtain a very great operating efficiency, with a consequent improvement of the mechanical charac-teristics of the finished wood shaving panel.
Another object of the present invention is to provide such a resin binding method and system providing an improved spreading of the mattress by the forming apparatus,. with consequent improved thick-E
ness tolerances of the raw panels at t:he outlet of the pressing machine.
Yet another object of the present. invention is to provide such a method and system which allow to overcome the requirement of using any paraffin emulsion.
Yet another object of the present invention is to provide such a method and system which do not include refrigerators for cooling the water circula-tion jackets of the resin binding apparatus.
According to one aspect of the present inven-tion, the above mentioned aim anei objects, as well as yet other objects, which will become more appa-rent hereinafter, are achieved by an improved system for making wood shaving panels, characterized in that said system provides for the use of a high tempera-ture fluid which preferably comprises pressurized steam, said fluid being conveyed intr> a resin bind-ing apparatus in order to increase the temperature of the wood shavings, glue materials and chemi-cal aids, which are so mixed as to provide a~ wood shaving panel.
6a More specifically, the present. irnvenf:ion provides a system for maki ng wood ~:havi ng panel s c:ompri si ng feedi ng means for feeding a wood shaving mass and a resin binding apparatus to which the wood shaving mass is supplied to be bound by glue materials and other chemical adjuvanis, wherei n the system further compri ses injector mean s for i n jecti ng a hi gh temperatrare pres ~uar°i geed f 1 ui d i nto the wood shaving means conveyed to the resin binding apparatus to increase the temperature of the wood shaving mass, the g1 ue materi al s and the cl~emi ~a l ad,juvant.s , whi ch are so mixed as to provide a wood shaving panel.
The present i event i on t~l so prvovi des an atomi zed resi n binding method for making wood shaving panfuls, wherein the method comprises the steps of simultaneously supplying heat and an even and di ffused dynami c pul se to a mi xture of wood shavings, glue and chemical adjuvants, subjected to a turbulent motion, produced by a stirrer ope:~rating inside a resin binding apparatus, and providing the heat and dynamic pulse by injecting into the resin binding <apparatus a pressuri zed water steam, t:he steam bei rag super-heated and pre-processed upstream of the loading zone of the mixture, with respect to a feeding direction of the mixture being stirred.
BRIEF DESCRIPTION OF THE DRAWINGS
Further characteristics and advantages of the invention will become more apparent hereinafter from the following detailed disclosure of a preferred, though not exclusive, embodiment thereof, vahich is illustrated, by way of an indicative, but not limi-tative example, in the accompanying drawings, where:
Figure 1 illustrates a schematic diagram of a conventional system for continuously pressing and making wood shaving panels;
Figure 2 illustrates a schematic diagram of a prior resin binding system for making panels;
Figure 3 illustrates a schematic diagram of other parts of a system for continuously making wood shaving panels;
Figure 4 illustrates a schematic diagram of a resin binding system for carrying out the method according to the present invention;
Figure 5 is a schematic cross-sectioned side view illustrating a vessel for steam processing wood shavings according to the invention;
and Figure 6 is a top cross-sectional view illus-trating the above vessel coupled to a steam condensa-to separating device.
DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to the figures of the accompany-ing dravrings, and, more specifically to Figure 2, prior resin binding systemsfor making wood shaving panels conventionally comprise a dry wood shaving metering hopper 1 vrhich supplies with a continuous flow of dry wood shavings a ribbon balance 2, sus-pended from a load cell 3.
The balance 2 is provided for continuously sending the data related to the vreight of the wood shavings supplied to the resin binding apparatus, to an electronic processor, which, in order to hold the dry glue/dry wood shaving weight ratio constant, as it has been set by the operator, will control the RPM's of a pump 5 which supplies the resin binding apparatus 4 with a glue mixture comprising, in parti-cular, water, a glue and a curing paraffin emulsion.
For each layer of the mattress being formed along the making line of the wood shaving panel there are conventionally used one or more resin bind-ing systemsof the above disclosed type.
Some resin apparatus are used for resin bind-ing the fine wood shavings, which will form the out-er surfaces of the panel, and one or more of said g resin binding apparatus will be used for resin bind-ing, the wood shavings having a larger particle size, and which will form the mattress or mattresses provided for forming the inner portion of the panel.
Downstream of the above disclosed apparatus, there is provided a forming system 6 which essential-ly comprises four forming apparatus 7, 8, 9, 10 ar-ranged in an in-line arrangement.
The first forming apparatus 7 is provided for spreading on a forming ribbon 11 a first layer of fine resin bond wood shavings, while the second 8 and third 9 forming apparatus are provided for forming two resin bond wood shaving layers of lar-ger particle size, and, finally, the first forming apparatus 10 is provided for forming the last layer of fine wood shavings.
The thus formed mattress 12 is entrained, by means of the forming ribbon 11 which is continuously driven under the above forming apparatus, inside a continuous pressing apparatus 13 comprising two steel webs or ribbons 14 sliding on heated plates 15 with the same speed as the forming ribbon 11.
Under the combined effect of pressure and temperature, the resin bond wood shaving mattress 12 to is set, owing to the curing of the resin, so as to provide a finished wood shaving panel.
As stated, however, the above prior making method is affected by several drawbacks.
In particular, in winter time, the tempera-ture of the mattress 12 decreases, with respect to the summer time temperature, of about 20°C, thereby involving a corresponding increase of the baking time and, accordingly, of the system operating time from 4.8 sec/mm to 5.9 sec/mm, for a base thickness of 18 mm of the finished wood shaving panel.
With reference to Figure 3, 4, 5 and 6, the nebulized resin binding system and method according to the present invention substantially provide to simultaneously subject to heat and an additional dynamic pulse, of even and diffused nature, the mix-ture of wood shavings, glue and chemical aids which is subjected to a turbulent motion provided by the stirrer 16 operating inside the resin binding appa-ratus 4.
In particular, the. heat is applied by inject-ing pressurized steam (at a preset pressure from 0.1 to 13 bars) and, in a preferred embodiment, the steam is super-heated to a temperature which can be preset by the operator (at 1?_0-2001°C1 <~nd being more-over pre-processed.
This is preferably obtained by means of a steel injector 17, arranged perpendim.nlarly to the flow direction, <~nd proviried with a nozzle having an inner diameter of 8-1() mm, at a distance of about 300 mm from the inlet hopper 18 in the resin binding apparatus, at a short distance upstre<rrn c~f the in-jectors ( not shown ) for 1 oath ng the g1 uei rig m. xture > wi th respect to the material advancement direc:t:ion as impressed by the sti rrer 16.
The mentioned pre-processing is performed in-side a suitable ~>teel c:ylindric vessel., or turbomixer 19, which, according to a preferred, i:hough not ex-clusive,embodiment has an inner diamei:er ~ - 350 mm, a height of about 600 mm and a thickness of about mm.
Thi s turbomi xer vessel 19 cornpri ses t:wo noz-z1 es 20 and 21 vahi c:h are arranged tangenti al 1y of the vessel surface and, in its inside, d4flet::-ing fins 22 and 23.
~1oreover, coupled to the vessel there is pro-vided a condensate separating device 2~, arranged up-stream of the vessel and in which there are separated r the steam fractions which v~ould deposit on the ducts of the system.
hlore specifically, t:he nozzle 20 allows super-heated steam to be introduced into i:he vessel, where-as the nozzle 21 is provided for introducing the several chemical aids or a~ljuvants.
A mixing of the super-heated steam and the chemical adjuvants is performed at the central re-gion of the vessel, because of the provision of the above mentioned deflecting fins 22 and 23 which operate so as to hold t:he chemical <idjuvants sepa-rated from the super-heated steam flow, during the first step in which these adjuvants are conveyed to the vessel for processing the steam.
In particular, the chemical adjuvants com-prise surface active agents, preferably ethylene and methylene glyccles.
These adjuvants are used for modifying the surface condition of the water so as to properly control the thermal balance of this water during the different year seasons, in the pressing step.
f~loreover, there are also used catalyzer sub-stances in order to accelerate tfoe curing of the glueing mixture and there are also used cleansing l:>
sub~;tanc:es.
The latter are used, in toartic:ular, vFor clean-ing all of the downstream arranged apparatus.
There are also a~E~d water-repellent. substances, in order to provide the wood shaving panel with an improved resistance against water.
From the atomized mixture formed as above disclosed, having even physical characteristics and conveyed through said injector 17 into the resin binding apparatus 4, there are transferred the con-densation heat and momentum, by impact, to the dry wood shavings, which are progressively impregnated by the glueing mixture, under the effect of mutual slipping, impacts and of the turbulent motion oc-curring between the several substances introduced into the resin binding apparatus 4.
The main feature of the present invention consists substantially of the injection of the super-heated steam, which allows to achieve sf_~ver<~l great advantages.
Firstly, as it is introduced into the resin binding machine, the steam will expand, so as to heat the glueing mixture and render it more "malle-able".
1 ~~
The steam, moreover, causes the wood pores to also expand, so as to allow the glue and other chemical adjuvants to properly enter these pores.
Accordingly, it is obtained an improved bind-ing efficiency, which will provide the finished wood shaving panel with very good mechanical character-istics, as well as a great resistance against ageing and moisture.
Moreover, the steam provide:; an o~otimal s;pread-ing of the chemical adjuvants throuc3h the mattress, without negatively affecting the catalysis of the binding resin.
The introduction of super-heated steam into the resin binding apparatus, provides moreover a good lubrication of its walls, preventing them from being fouled, and this without t:he requirement of using cooled water, since exclusively tower water at 30°C is used, as necessary for cooling the water jackets of the resin binding apparatus.
Moreover, it is provided to actuate, by means of the steam progressively condensing on the inner wall of the cylindric jacket 4' of the resin bind-ing apparatus 4, lubricating action on the wood shaving 'flow toward .. - 15 the outlet 29 to the forming station 6.
One of the main advantages of the present in-vention is that the steam provides a great reduction of the baking time.
In fact, the super-heated steam will cause, in a very advantageous manner, and mainly in winter time, an increase of the mattress temperature of about 20°C, with a corresponding increase of the operating efficiency of about 20°/, in the term of the amount or yield of made panels.
A further important aspect of the invention is that the disclosed method also allows to obtain a great reduction of the formaldehyde contents of the finished product.
From the above disclosure it should be appa-rent that the invention fully achieves the intended aim and objects.
The invention as disclosed is susceptible to several;modifications and variations, all of which will come within the scope of the inventive idea.
Moreover, all of the details can be replaced by other technically equivalent elements.
In practicing the invention, the used mate-rial, provided that they are compatible to the in-. _ is ~~~494~
tended use, as well as the contingent size and shapes can be any according to requirements.
Claims (18)
1 . A system for making wood shaving panels comprising feeding means for feeding a wood shaving mass and a resin binding apparatus to which said wood shaving mass is supplied to be bound by glue materials and other chemical adjuvants, wherein said system further comprises injector means for injecting a high temperature pressurized fluid into said wood shaving means conveyed to said resin binding apparatus to increase the temperature of said wood shaving mass, said glue materials and said chemical adjuvants, which are so mixed as to provide a wood shaving panel.
2. A system according to claim 1, wherein said high temperature pressurized fluid comprises super-created pressurized water steam and said injector means are arranged perpendicularly to a covering direction of said wood shaving mass to be mixed in said resin binding apparatus.
3. A system according to claim 2, wherein pressurized steam injector means are-arranged upstream of further glue injector means for loading a glue mixture, with respect to are advancing direction of a wood shaving and glue mixture, said mixture being stirred by toothed stirring means arranged according to a spiral like generatrix line.
4. A system according to claim 2 or 3, wherein the super-heated steam flow is caused to expand through said resin binding apparatus to transmit a dynamic pulse to the wood shaving and glue mass in said resin binding apparatus.
5. A system according to claim 2, 3 or 4, wherein said system comprises a mixing vessel for mixing said super-heated steam and chemical adjuvants, said mixing vessel being arranged upstream of said injector means in turn connected to a condensate separating device.
6. A system according to claim 5, wherein said mixing vessel comprises a first steam duct arranged tangentially of the wall of said mixing vessel for processing said steam, said steam being conveyed at the front of a second tangentially arranged duct therethrough said chemical adjuvants mixed with said stream in said vessel are conveyed.
7. A system according to claim 5 or 6, wherein inside said mixing vessel are arranged deflecting fins holding said chemical adjuvants separated by said steam flow at the start of the introduction of said steam, to provide an even mixing of said steam with said chemical adjuvants.
8. A system according to any one of claims 2 to 7, wherein said super-heated pressurized steam has a pressure from 0.1 to 13 bar and is super-heated to a temperature from 120°C to 200°C.
9. A system according to any one of claims 2 to 8, wherein said binding apparatus comprises a cylindrical jacket having an inner wall thereon said steam condensers to provide a lubricating effect on the resin bond wood shaving flow directed to an outlet of said binding apparatus toward a forming station.
10. A system according to any one of claims 1 to 9, wherein said system comprises a further vessel to which are conveyed surface active substances, catalyzer substances, cleaning and water-repellent substances, to form an atomized mixture to be successively conveyed to said resin binding apparatus.
11. A system according to claim 10, wherein said atomized mixtures transfers condensing heat and momentum, by impact, to dry said wood shavings which are progressively impregnated by said glue mixture, under the effect of slipping forces, mutual impacts and turbulent motion in said resin binding apparatus, to provide said atomized mixture with even physical characteristics.
12. A system according to any one of claims 1 to 11, wherein said system further comprises cooling means for water cooling resin binding apparatus.
13. An atomized resin binding method for making wood shaving panels, wherein said method comprises the steps of simultaneously supplying heat and an even and diffused dynamic pulse to a mixture of wood shavings, glue and chemical adjuvants, subjected to a turbulent motion, produced by a stirrer operating inside a resin binding apparatus, and providing said heat and dynamic pulse by injecting into said resin binding apparatus a pressurized water steam, said steam being superheated and pre-processed upstream of the loading zone of said mixture, with respect to a feeding direction of said mixture being stirred.
14. A method according to claim 13, wherein said method further comprises a step of pre-processing said super-heated steam inside a cylindric vessel into which surface active agents, catalyzer substances and cleansing and water-repellent substances are injected, so as to provide an atomized mixture to be fed to said resin binding apparatus.
15. A method according to claim 13 or 14, wherein said super-heated water steam is fed to said vessel through a first nozzle, a second nozzle being provided for feeding into said vessel said surface active agents, catalyzer and cleansing and water-repellent substances.
16. A method according to claim 13, 14 or 15, wherein said method further comprises a step of transferring the condensing heat and momentum of said atomized mixture, by impact, to dry said wood shavings progressively impregnated by said glue mixture under the effect of sliding forces and mutual impacts generated by a turbulent motion in said resin binding apparatus, to provide an even physical characteristics flow of said atomized mixture.
17. A method according to any one of claims 13 to 16, wherein said method further comprises a step of progressively condensing said steam on an inner wall of a cylindric jacket of said resin binding machine to provide a lubricating effect on the resin bond wood shaving mixture flowing toward an outlet of said resin binding apparatus to a forming station.
18. A method according to any one of claims 13 to 17, wherein said method further comprises a step of injecting super heated and pre-processed water steam by means of one or more injectors perpendicular to the feeding direction of said wood shaving mass, at a short distance upstream of a loading station of said glue mixture.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI920712A IT1254557B (en) | 1992-03-25 | 1992-03-25 | PROCESS AND PLANT FOR NEBULIZED RESINING FOR THE PRODUCTION OF CHIPBOARD PANELS |
| ES92830551T ES2077387T3 (en) | 1992-03-25 | 1992-10-01 | PROCEDURE FOR BONDING THROUGH ATOMIZED RESIN AND SYSTEM FOR THE MANUFACTURE OF WOODEN FIBER PANELS. |
| EP92830551A EP0562219B1 (en) | 1992-03-25 | 1992-10-01 | Atomized resin binding method and system for making wood-shaving panels |
| DE69203225T DE69203225T2 (en) | 1992-03-25 | 1992-10-01 | For the process with atomized resin and system for the production of wood shavings. |
| AT92830551T ATE124314T1 (en) | 1992-03-25 | 1992-10-01 | ON THE AUTOMIZED RESIN METHOD AND SYSTEM FOR PRODUCING PANEL PARTS. |
| CN93104988A CN1094350A (en) | 1992-03-25 | 1993-04-24 | Make the atomizing resinoid bond method and system of particieboard |
| CA002094940A CA2094940C (en) | 1992-03-25 | 1993-04-27 | Atomized resin binding method and system for making wood-shaving panels |
| ZA934905A ZA934905B (en) | 1992-03-25 | 1993-07-08 | Atomized resin binding method and system for making wood-shaving panels |
| AU41905/93A AU4190593A (en) | 1992-03-25 | 1993-07-13 | Atomized resin binding method amd system for making wood-shaving panels |
| BR9302541A BR9302541A (en) | 1992-03-25 | 1993-07-27 | System for the manufacture of wood chip panels and atomized resin agglutination method |
| JP5186512A JPH0752111A (en) | 1992-03-25 | 1993-07-29 | Resin joining system for producing wood-shaving panel and method therefor |
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI920712A IT1254557B (en) | 1992-03-25 | 1992-03-25 | PROCESS AND PLANT FOR NEBULIZED RESINING FOR THE PRODUCTION OF CHIPBOARD PANELS |
| CN93104988A CN1094350A (en) | 1992-03-25 | 1993-04-24 | Make the atomizing resinoid bond method and system of particieboard |
| CA002094940A CA2094940C (en) | 1992-03-25 | 1993-04-27 | Atomized resin binding method and system for making wood-shaving panels |
| ZA934905A ZA934905B (en) | 1992-03-25 | 1993-07-08 | Atomized resin binding method and system for making wood-shaving panels |
| AU41905/93A AU4190593A (en) | 1992-03-25 | 1993-07-13 | Atomized resin binding method amd system for making wood-shaving panels |
| BR9302541A BR9302541A (en) | 1992-03-25 | 1993-07-27 | System for the manufacture of wood chip panels and atomized resin agglutination method |
| JP5186512A JPH0752111A (en) | 1992-03-25 | 1993-07-29 | Resin joining system for producing wood-shaving panel and method therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2094940A1 CA2094940A1 (en) | 1994-10-28 |
| CA2094940C true CA2094940C (en) | 2003-09-09 |
Family
ID=27560581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002094940A Expired - Fee Related CA2094940C (en) | 1992-03-25 | 1993-04-27 | Atomized resin binding method and system for making wood-shaving panels |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0562219B1 (en) |
| JP (1) | JPH0752111A (en) |
| CN (1) | CN1094350A (en) |
| AT (1) | ATE124314T1 (en) |
| AU (1) | AU4190593A (en) |
| BR (1) | BR9302541A (en) |
| CA (1) | CA2094940C (en) |
| DE (1) | DE69203225T2 (en) |
| ES (1) | ES2077387T3 (en) |
| IT (1) | IT1254557B (en) |
| ZA (1) | ZA934905B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2787770B1 (en) * | 1998-12-29 | 2001-02-23 | Jpb Creations | METHOD AND DEVICE FOR AUTOMATICALLY FILLING A HEATING CONTAINER WITH A SOLID PRODUCT |
| DE29912822U1 (en) * | 1999-07-22 | 2000-08-17 | Heggenstaller Anton Ag | Extrusion press for small plant parts |
| AUPS140602A0 (en) * | 2002-03-28 | 2002-05-09 | Spence, Owen Allan | Improved resin distribution in blowline resin injection |
| DE102006058625B3 (en) | 2006-12-13 | 2008-06-05 | Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg | Fibers gluing system for producing e.g. medium density fiberboard plates, has nozzles that are transferred in gluing operation from standby into operating positions to glue fibers and transferred during operation interruption |
| IT1399772B1 (en) * | 2010-04-30 | 2013-05-03 | Imal Srl | APPARATUS FOR THE INJECTION OF CHEMICAL COMPONENTS IN A FLOW OF NON-INCORRENT WOODEN MATERIAL |
| DE102011007336A1 (en) * | 2011-04-13 | 2013-04-25 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Method for operating a plant and apparatus for gluing chips, fibers or fiber-like material in the course of the production of material plates |
| CN102528885B (en) * | 2011-12-16 | 2015-03-25 | 申清章 | A stirring device of wood chip stirring machine |
| DE102013104652A1 (en) * | 2013-05-06 | 2014-11-06 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Method and device for gluing chips, fibers or fiber-like material in the course of the production of material plates |
| CN104162922A (en) * | 2013-05-20 | 2014-11-26 | 北京泛欧瑞得科技有限公司 | Shaving board high-pressure quantitative sizing system |
| CN107322746B (en) * | 2017-08-25 | 2019-08-20 | 江苏露水河人造板有限公司 | A kind of sizing equipment and method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH232065A (en) * | 1941-05-15 | 1944-05-15 | Fahrni Fred | Process for the production of compressed wood art panels. |
| DE883337C (en) * | 1941-05-16 | 1953-07-16 | Fred Fahrni | Process for the production of synthetic wood panels |
| US2872337A (en) * | 1953-12-30 | 1959-02-03 | Weyerhaeuser Timber Co | Method of coating a felted fibrous mat |
| FR1136193A (en) * | 1955-02-01 | 1957-05-10 | Draiswerke Gmbh | Improvements to the processes for manufacturing plates or other objects molded from wood chips or other materials in the form of chips or fibers and agglomerated using thermosetting binders, as well as to devices for placing them implemented |
| US3519469A (en) * | 1966-04-19 | 1970-07-07 | Mobil Oil Corp | Structural board composed of wax-coated cellulosic particles |
| US4407771A (en) * | 1982-04-26 | 1983-10-04 | The Celotex Corporation | Blow line addition of isocyanate binder in fiberboard manufacture |
| ES2048968T3 (en) * | 1989-03-20 | 1994-04-01 | Medite Europ | APPARATUS AND METHOD OF MANUFACTURE OF SYNTHETIC BOARDS, INCLUDING FIREPROOF BOARDS. |
| SU1638011A1 (en) * | 1989-03-23 | 1991-03-30 | Всесоюзный Научно-Исследовательский Институт Деревообрабатывающей Промышленности | Mixer |
-
1992
- 1992-03-25 IT ITMI920712A patent/IT1254557B/en active IP Right Grant
- 1992-10-01 DE DE69203225T patent/DE69203225T2/en not_active Expired - Fee Related
- 1992-10-01 AT AT92830551T patent/ATE124314T1/en not_active IP Right Cessation
- 1992-10-01 EP EP92830551A patent/EP0562219B1/en not_active Expired - Lifetime
- 1992-10-01 ES ES92830551T patent/ES2077387T3/en not_active Expired - Lifetime
-
1993
- 1993-04-24 CN CN93104988A patent/CN1094350A/en active Pending
- 1993-04-27 CA CA002094940A patent/CA2094940C/en not_active Expired - Fee Related
- 1993-07-08 ZA ZA934905A patent/ZA934905B/en unknown
- 1993-07-13 AU AU41905/93A patent/AU4190593A/en not_active Abandoned
- 1993-07-27 BR BR9302541A patent/BR9302541A/en not_active IP Right Cessation
- 1993-07-29 JP JP5186512A patent/JPH0752111A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| BR9302541A (en) | 1995-03-01 |
| JPH0752111A (en) | 1995-02-28 |
| DE69203225T2 (en) | 1995-11-02 |
| AU4190593A (en) | 1995-01-27 |
| DE69203225D1 (en) | 1995-08-03 |
| ITMI920712A1 (en) | 1993-09-25 |
| EP0562219B1 (en) | 1995-06-28 |
| ITMI920712A0 (en) | 1992-03-25 |
| EP0562219A1 (en) | 1993-09-29 |
| IT1254557B (en) | 1995-09-25 |
| ZA934905B (en) | 1994-02-09 |
| CA2094940A1 (en) | 1994-10-28 |
| CN1094350A (en) | 1994-11-02 |
| ES2077387T3 (en) | 1995-11-16 |
| ATE124314T1 (en) | 1995-07-15 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |