CA2454707C - Foaming method and device - Google Patents
Foaming method and device Download PDFInfo
- Publication number
- CA2454707C CA2454707C CA2454707A CA2454707A CA2454707C CA 2454707 C CA2454707 C CA 2454707C CA 2454707 A CA2454707 A CA 2454707A CA 2454707 A CA2454707 A CA 2454707A CA 2454707 C CA2454707 C CA 2454707C
- Authority
- CA
- Canada
- Prior art keywords
- gas
- gluing substance
- substance
- gluing
- foaming
- 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 - Fee Related
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/08—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers using foamed adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
- B01F27/271—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/235—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam
- B01F23/2351—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam using driven stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/70—Spray-mixers, e.g. for mixing intersecting sheets of material
- B01F25/72—Spray-mixers, e.g. for mixing intersecting sheets of material with nozzles
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/30—Presence of wood
- C09J2400/303—Presence of wood in the substrate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S261/00—Gas and liquid contact apparatus
- Y10S261/26—Foam
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
- Y10T156/1798—Surface bonding means and/or assemblymeans with work feeding or handling means with liquid adhesive or adhesive activator applying means
Abstract
The invention relates to a method and a device for foaming glue for the production of wood-based sheets. Gluing substance and gas are fed (1,2) into the foaming device through nozzles (3,4), which are directed to mix the gluing substance and gas to be fed to form an essentially homogenous mixture prior to foaming. After this the gluing substance is foamed mechanically in the foaming chamber (5) with the aid of gas.
Description
FOPsMING MET~IOD ADD DEVICE
The ir~.vention relates to a foaming method ac-cording. to the ~.zu.troduc.t~.on of claim 1, and a foaming ~ device accoxdiz~,g to the introduction of claa.m 7 used in the product~.on of wood-based sheets such as ply-wood, battenboard or the like to achieve the necessary foaming of the glue.
Plywood as used ~ herea.xi ' refers to plywood, battenboard or, a similar many-layered product that is formed ~of at least.three vemeer layers placed one on tap v~ th.e other ox crossways to one another and glued and compressed against one axiother.
Previously~known axe different foaming meth . ods and ~devi.ces used in the wood sheet industry ~ to foam g.J.ue wzth the axd. of gas, advantageously ~of . air, before ,it is fed for gluing wood sheets. In known foaming methods and dev~.Ges glue and air are directed straight into a foaming chamber where the g7.ue is foamed mechanica3.ly with the aid of air.
The problem of knowxx foaming methods is that the foaming of the glue is not efficient enough.. To achieve the desired degree of foaming it is necessary to usevery high znechanycal foamer rotation speeds, which in turn results in the added disadvantage of heating of the glue mixture.
The vbj ect of the invention is to remove the above--mentioned disadvantages. In particular the ob j ect of the a.nvexa,t~.on, is to disclose a new, better and mare efficieza.t g7.ue foaming method .and device.
A, foaming method anal device according to the ~.nverztion is characterised by that which is presented in the claims_ The base of the invention is a method for .
foaming glue far, production of wood-based sheets in which the gluing substance and the gas are 'brought '. into contact with one another an;d the gluing substance ~ CA 02454707 2003-12-31 a.s mechanically foamed with the aid of the gas. ~c-cording to the invention the gluixag substance and the.
gas are mixed to an essential.7.y homogeneous mixture bef ore rnecharfica~ f oaming .
S 2n mechanical foaming the gluing substaxa.Ce and gas. mixture is beat vigorously by meahan.xca~.~ fvaxrc- .
ing means, whereupon the gluing substance is made to foam with the aid of gas bubbles.
In one. embodiment of the ~.nvent3on ~ the gas and the gluing substance are mixed by 'spraying them together simultaneously as, several directed, partial f2ows such that as large a contact surface area as possible is proc~iuced bet~reen ,the .gas 'and the gluing' substance. ' Z5 ~ In one embodimerit of the a.rlvention the gluing substance and the gas are sprayed 'in a circular way_ such that the gas a.s fed essentially from the cexatre ar,d the gluing substance from a ring around the gluing substance feed with the g~.uing substar~,ce and ~ gas sprays c~.irected such that the gluing substar,~ce and the gas come in contact with one axioth,er.
In one alternative embodiment of the imren-tion the gluing substance and the gas are sprayed ire, an circu7.ar way such . that the gas is fed essentially ~ ~rotn the centre and the gluincs substance from a ring around the gas feed with the gluimg substance and gas - spra~rs directed such that the gluing substance and the gas come in contact with vne another.
Zn one. embodiment the gluing substance and gas flo~nts axe sprayed sirnultaneous,ly from a Feeder surface on which the g7.ua.ng substance anc3. gas feeder r~.ozzles are arranged alternately and essentially sym metrical7.y across the entire su~'face area .
In one embodiment of the inventibn air is used as the gas.
In oi7.e embodiment of the znven.tion a ~ compos~.-tion is used as the gluit~,g substance that coxltaina = CA 02454707 2003-12-31 resin, foamiza.g ageza,t, filling agent and/or hardener.
Vin. one embod~.merxt for the res~.r~,, which is the actual gluing substance, advantageously phenol forma.ldebyde resins, . ' urea forma7.dehyde resins, amino resins or other si.mil.ar resins can be used. For the foaming agent, fi3.ling agerst and hardener different types of substances kraawn in the art and suitable for their in-tended purpose cax~. be used. 1 Additioxxally the base of~ the invention ~.s a device for foaming glue for the production of wood based sheets in which the device has gluing substance and gas nozzle systlem, anal a foaming chamber and foam ing means for foaming the gluing substaizce mechani tally with the aid of a gas, and means for directing 25, the foamed gas out of the device. According to the..in-ventioxl the device has a mixing chamber, in which are arranged.gluing substance .and gas zxozzles of the ~noz=
zle system that are directed to mix the gas and gluing substance fed into the mixing chamber into an essen-tiaJ.ly homogeneous mixture before mechanical foaming.
. In one embodiment of the invention the r~,ozz~.e system is arxanged to mix by spraying partial flows df gluing substance arid gas simultaneously from many di--rected gluing substance and gas nuzzles such that the largest possible contact sv.rface area between the g1u-ing substance and the gas is.produced.
zn one embodiment of the imvent~.on. the noz~
zles of the n.ozzJ.e system are arranged such that the gluing substance nozzles are arranged essentially in the ceza,tre and the gas nozzles are arxanged in a ring shaped dorm around. the gluing substance nozzles, and the gas and gluing substance nozzles axe directed such that the sprayed g7.uzng substance and gas are brought in contact, with one another.
zn one embodiment of the invention the noz--z~.es of the nozzle system are arranged such that the gas nozzles are arranged essentially in the centre and the gluing substance nozzles are arranged in a ring shaped form around the gas.nozzles, and the gas and gluing substance noazles are directed such that the sprayed gluing substance and gas are brought in can tact with. one another.
In one embodiment of the invention the noz-zles of the nozale system are arranged in a matrix constructiori where gas and glu~.ng substance nozzles alternate across the entire feec~e~ surface ' area of the ~.0 noxz7.e system. The Bras and gluing substance ~ nozzles are, essentially evenly distributed across the entire surface of the nozzle structure.
In a device according to the invention the number of nozzles car: vary dependiryg oz~i fox example inter~,ded use and the conditions fox use. ' ' ~ AdvaxxtageousJ.y the gluing substance and gas nozzles of the nozzle system can in principle be di-rected in any way whatsoever, ~hosaever such that be-tween the sprays of~ gluing substance and gas the larg-est possible contact surface area is produced.. Due to a large contact surface area ,ar~.d. the mixirzg of sub- .
stances that occurs there: as perfect-as-possible mix-ing of the glu3,ng substance and, gas into an even, ho-mogeneous mixture occurs . 'rhe nozzles can be directed straight down or straight to the side at a 90-degree angle ~ or at aray axigle between 0 ~ and 9 4 ~ .
In one embodiment of the invention the foam-ing means ~ ~.xiclucle ro,tar p~.ates whose rotation speed is advantageously about 500 - 1200 rpm.
3 0 ~ In one embodi~tent the foaming device Contains a water circulatiorx system, by which the functioning of the foamer can be ma~.ntained far exarnp~.e ~ during production standstill ~rithout unnecessary foaming of the g7.uing substance arid extinguishing of the foam.
Due to the invention a more efficient .glue foaming process can be achieved. Due to the forming of a ~homoger~eous gluing substance-gas~mixture, the gluing substance foams better wa:th lower rotation speeds arid warms up less during the foaming.
Due to the invention an e~ren, homogeneous gluing substance and gas mixture can be achieved al ready before the actual mechanical foaming, whereupon also the foamed g3.ue mixture~that is directed onto the surface to be glued. is highly homogenous. Additiona7.ly the foamed glue mixture is easy and quick to spread on a surface to be glued_ .
~ Foaming method and device according to the invention are suitable for use in the production of different types of wood-based sheets under various conditions.
zn the . fo~.~.owing, the inverxtioxa, is described in detail with the aid of appl~icat~.oza. examp7.es with reference to the accompanyiza,g dxaw~.ngs. in wha.ch Figure' Z shows ~a foaming device according to the invez~tioxj.. azld Figure 2 sla.ows in more c'ietail the nozzle sys-tem of the device of ~'igixre 1.
W'igure 1 shows a foaming device that is in tended for foaming a gluing substance zn~.xtuxe with the aid of air. The foamed'gluing substance is used for gluing wood-based thin sheets and joining .them to one another to form fox examp7.e, plywood.
The foamixig device in. figure 1 has a nozzle system 1-4, through wla.~.ch the gluing substance and air are fed ~.z~to the foaming device and a mixing chamber 7, into which the gluing substance are fed and. in which .occurs the spraying of gluing substance and air to form an adequately homogeneous mixture pra.or to the actual foaming. The foaming device aJ.so coz~taiz~.s a foaming chamber 5 and four rotor ~aZates 6 that func-tion as foam3.ng mea~rzs for foatnizzg the g7:uing substance mechanically wath the aid of air. °~he cen.trifugal ro-tor plates 6 are arranged inside the foaming chamber 5 , in which the gluing substance is framed. The rota--Lion speed of the rotor p3.ates is set to 500 - x.200 rpm. The rotor plates have projections 8 that are ar-ranged symmetrically in five circularly winding roars.
These projections 8 aid in the foaming of the g7.uing substance. For mechanical foaming any kind of mixing organs suitable for foaming can be used, these are not shown in this ,connection in more detail. ~AdditionaZ3.y the foamixlg device contains a pipe or canal 9 for.di recting the glua.ng 'substance out of the device and for 20 spreading the glue.
The nozzle system 1-4 of. Figures ~. and 2 con-tains feedex szleans fvr both the gluing substance 2 and air 1 as we~.1 as severs, nozzles 3 for the gluing sub-stance and arranged zn the shape of a cxrcle'i~n a ring-like way nozzles 4 for ai.x for feedzrig the g7.uing substance and air by spraya,ng them ~.nto 'the mixing chamber 7. Nozzles 3,4 are arranged in the feeder sur-face area 10 of .the nozzle system, such that the glu-ing substance nozzles,3 are'located symmetrically in the middle of the feeder surface area and the air noz-zles 4 are arranged in a circular way in one ring around the gluing substaz~.ce nozzles 3. Both the glui.xlg substance and the azx nozzles 3,4 axe directed such that a~large and good~conta.ct area is praduced between the partial flows of gluing substance and afar ~ arxd such that the partial flows mix to farm an essentially ho-mogenous mixture in the mixing chamber ~ before the actual foaming chamber 5, when the gluing substance and~a~.r partial flows are sprayed simultaneously from nozzles 3 and 4 into the mixa.ng chamber 7. bluing sub-stance 3 arid. air nozzles 4 8.re arranged iixtc~ ~tl3,e mix-ing chamber 7.
Fur~h.er the device in Figure ~, cosn.ta~.r~s means for raising and adjusting the pressure of air, pref ~5 erably to approximately 4 bar, prior to feedisrxg it into the foaming device. Additionally the device con-twins a means for adjusting airflow. Means for adjust-ing pressure and flow are not shown in the figure.
Further the device ~ . ~.n Fi.gure 2 contains a gluir~,g substance pump for pumping the glu~,rr,g substance from the glue storage container into the nozzle system and a flow adjustment meter far adjusting the desired speed, of flow. The pump and the flow adjustment meter are not shown in the figure.
.Additionally the device in Figure 1 Contains a temperature measuring probe axed a temperature ad-5ustment mearss, which are not shown in the figure, and are used 'to adjust the temperature of the glu~.ng sub stance-air mixture.
In a method application according to the in vention air, at a .pressure of abr~ut 4 bar, a.s directed anal gluing substance is pumped at a desired speed of flow into the foam3.ng device shown in Figure 1 through the nozzle system such that the partial flows of glu ing substance are sprayed from the nozzles in the cen tre and air is sprayed in a ring-like way around the sprays of gluing substance into the mixing chamber.
The gluing substance arid air nozzles axe directed in the mixing chamber such'that a large contact surface area is produced between. the gluing substax~ce and the air, in which case their homogeneous mixing occurs prior to their being directed into the actual foam~,ng area. In, the actual foaming area the homdgenous gluing substance-air mixture is foamed mechanically with the aid of beating means or ~.n. other words rotor plates.
Tla.e foamed g7.uing substance is directed to the gluE-spreading device for spxeadi~n.g for ~ the gluing of wood-based sheets and for jozn~.ng these sheets together.
Alterro.atively the gluing substance caxi, for example durirag a production standstill or during a temporary d3stux~bance, be directed into so-called foam extin-guishi.ng and be later recycled for foaming of the glu-ing~substance.
~ CA 02454707 2003-12-31 ,~ foami.x~g method and device accord~.ng to the increxxt~.ors are suitab~.e for vario~zs embodiments to achieve the necessary foaming of the glue ~rhen produc-ing differexa,t 'types of wood-based sheets.
Applications of the invention are nat limited to the examples described ratb.er they may 5rary ~.n the scope of the accompanying c3.aims.
The ir~.vention relates to a foaming method ac-cording. to the ~.zu.troduc.t~.on of claim 1, and a foaming ~ device accoxdiz~,g to the introduction of claa.m 7 used in the product~.on of wood-based sheets such as ply-wood, battenboard or the like to achieve the necessary foaming of the glue.
Plywood as used ~ herea.xi ' refers to plywood, battenboard or, a similar many-layered product that is formed ~of at least.three vemeer layers placed one on tap v~ th.e other ox crossways to one another and glued and compressed against one axiother.
Previously~known axe different foaming meth . ods and ~devi.ces used in the wood sheet industry ~ to foam g.J.ue wzth the axd. of gas, advantageously ~of . air, before ,it is fed for gluing wood sheets. In known foaming methods and dev~.Ges glue and air are directed straight into a foaming chamber where the g7.ue is foamed mechanica3.ly with the aid of air.
The problem of knowxx foaming methods is that the foaming of the glue is not efficient enough.. To achieve the desired degree of foaming it is necessary to usevery high znechanycal foamer rotation speeds, which in turn results in the added disadvantage of heating of the glue mixture.
The vbj ect of the invention is to remove the above--mentioned disadvantages. In particular the ob j ect of the a.nvexa,t~.on, is to disclose a new, better and mare efficieza.t g7.ue foaming method .and device.
A, foaming method anal device according to the ~.nverztion is characterised by that which is presented in the claims_ The base of the invention is a method for .
foaming glue far, production of wood-based sheets in which the gluing substance and the gas are 'brought '. into contact with one another an;d the gluing substance ~ CA 02454707 2003-12-31 a.s mechanically foamed with the aid of the gas. ~c-cording to the invention the gluixag substance and the.
gas are mixed to an essential.7.y homogeneous mixture bef ore rnecharfica~ f oaming .
S 2n mechanical foaming the gluing substaxa.Ce and gas. mixture is beat vigorously by meahan.xca~.~ fvaxrc- .
ing means, whereupon the gluing substance is made to foam with the aid of gas bubbles.
In one. embodiment of the ~.nvent3on ~ the gas and the gluing substance are mixed by 'spraying them together simultaneously as, several directed, partial f2ows such that as large a contact surface area as possible is proc~iuced bet~reen ,the .gas 'and the gluing' substance. ' Z5 ~ In one embodimerit of the a.rlvention the gluing substance and the gas are sprayed 'in a circular way_ such that the gas a.s fed essentially from the cexatre ar,d the gluing substance from a ring around the gluing substance feed with the g~.uing substar~,ce and ~ gas sprays c~.irected such that the gluing substar,~ce and the gas come in contact with one axioth,er.
In one alternative embodiment of the imren-tion the gluing substance and the gas are sprayed ire, an circu7.ar way such . that the gas is fed essentially ~ ~rotn the centre and the gluincs substance from a ring around the gas feed with the gluimg substance and gas - spra~rs directed such that the gluing substance and the gas come in contact with vne another.
Zn one. embodiment the gluing substance and gas flo~nts axe sprayed sirnultaneous,ly from a Feeder surface on which the g7.ua.ng substance anc3. gas feeder r~.ozzles are arranged alternately and essentially sym metrical7.y across the entire su~'face area .
In one embodiment of the inventibn air is used as the gas.
In oi7.e embodiment of the znven.tion a ~ compos~.-tion is used as the gluit~,g substance that coxltaina = CA 02454707 2003-12-31 resin, foamiza.g ageza,t, filling agent and/or hardener.
Vin. one embod~.merxt for the res~.r~,, which is the actual gluing substance, advantageously phenol forma.ldebyde resins, . ' urea forma7.dehyde resins, amino resins or other si.mil.ar resins can be used. For the foaming agent, fi3.ling agerst and hardener different types of substances kraawn in the art and suitable for their in-tended purpose cax~. be used. 1 Additioxxally the base of~ the invention ~.s a device for foaming glue for the production of wood based sheets in which the device has gluing substance and gas nozzle systlem, anal a foaming chamber and foam ing means for foaming the gluing substaizce mechani tally with the aid of a gas, and means for directing 25, the foamed gas out of the device. According to the..in-ventioxl the device has a mixing chamber, in which are arranged.gluing substance .and gas zxozzles of the ~noz=
zle system that are directed to mix the gas and gluing substance fed into the mixing chamber into an essen-tiaJ.ly homogeneous mixture before mechanical foaming.
. In one embodiment of the invention the r~,ozz~.e system is arxanged to mix by spraying partial flows df gluing substance arid gas simultaneously from many di--rected gluing substance and gas nuzzles such that the largest possible contact sv.rface area between the g1u-ing substance and the gas is.produced.
zn one embodiment of the imvent~.on. the noz~
zles of the n.ozzJ.e system are arranged such that the gluing substance nozzles are arranged essentially in the ceza,tre and the gas nozzles are arxanged in a ring shaped dorm around. the gluing substance nozzles, and the gas and gluing substance nozzles axe directed such that the sprayed g7.uzng substance and gas are brought in contact, with one another.
zn one embodiment of the invention the noz--z~.es of the nozzle system are arranged such that the gas nozzles are arranged essentially in the centre and the gluing substance nozzles are arranged in a ring shaped form around the gas.nozzles, and the gas and gluing substance noazles are directed such that the sprayed gluing substance and gas are brought in can tact with. one another.
In one embodiment of the invention the noz-zles of the nozale system are arranged in a matrix constructiori where gas and glu~.ng substance nozzles alternate across the entire feec~e~ surface ' area of the ~.0 noxz7.e system. The Bras and gluing substance ~ nozzles are, essentially evenly distributed across the entire surface of the nozzle structure.
In a device according to the invention the number of nozzles car: vary dependiryg oz~i fox example inter~,ded use and the conditions fox use. ' ' ~ AdvaxxtageousJ.y the gluing substance and gas nozzles of the nozzle system can in principle be di-rected in any way whatsoever, ~hosaever such that be-tween the sprays of~ gluing substance and gas the larg-est possible contact surface area is produced.. Due to a large contact surface area ,ar~.d. the mixirzg of sub- .
stances that occurs there: as perfect-as-possible mix-ing of the glu3,ng substance and, gas into an even, ho-mogeneous mixture occurs . 'rhe nozzles can be directed straight down or straight to the side at a 90-degree angle ~ or at aray axigle between 0 ~ and 9 4 ~ .
In one embodiment of the invention the foam-ing means ~ ~.xiclucle ro,tar p~.ates whose rotation speed is advantageously about 500 - 1200 rpm.
3 0 ~ In one embodi~tent the foaming device Contains a water circulatiorx system, by which the functioning of the foamer can be ma~.ntained far exarnp~.e ~ during production standstill ~rithout unnecessary foaming of the g7.uing substance arid extinguishing of the foam.
Due to the invention a more efficient .glue foaming process can be achieved. Due to the forming of a ~homoger~eous gluing substance-gas~mixture, the gluing substance foams better wa:th lower rotation speeds arid warms up less during the foaming.
Due to the invention an e~ren, homogeneous gluing substance and gas mixture can be achieved al ready before the actual mechanical foaming, whereupon also the foamed g3.ue mixture~that is directed onto the surface to be glued. is highly homogenous. Additiona7.ly the foamed glue mixture is easy and quick to spread on a surface to be glued_ .
~ Foaming method and device according to the invention are suitable for use in the production of different types of wood-based sheets under various conditions.
zn the . fo~.~.owing, the inverxtioxa, is described in detail with the aid of appl~icat~.oza. examp7.es with reference to the accompanyiza,g dxaw~.ngs. in wha.ch Figure' Z shows ~a foaming device according to the invez~tioxj.. azld Figure 2 sla.ows in more c'ietail the nozzle sys-tem of the device of ~'igixre 1.
W'igure 1 shows a foaming device that is in tended for foaming a gluing substance zn~.xtuxe with the aid of air. The foamed'gluing substance is used for gluing wood-based thin sheets and joining .them to one another to form fox examp7.e, plywood.
The foamixig device in. figure 1 has a nozzle system 1-4, through wla.~.ch the gluing substance and air are fed ~.z~to the foaming device and a mixing chamber 7, into which the gluing substance are fed and. in which .occurs the spraying of gluing substance and air to form an adequately homogeneous mixture pra.or to the actual foaming. The foaming device aJ.so coz~taiz~.s a foaming chamber 5 and four rotor ~aZates 6 that func-tion as foam3.ng mea~rzs for foatnizzg the g7:uing substance mechanically wath the aid of air. °~he cen.trifugal ro-tor plates 6 are arranged inside the foaming chamber 5 , in which the gluing substance is framed. The rota--Lion speed of the rotor p3.ates is set to 500 - x.200 rpm. The rotor plates have projections 8 that are ar-ranged symmetrically in five circularly winding roars.
These projections 8 aid in the foaming of the g7.uing substance. For mechanical foaming any kind of mixing organs suitable for foaming can be used, these are not shown in this ,connection in more detail. ~AdditionaZ3.y the foamixlg device contains a pipe or canal 9 for.di recting the glua.ng 'substance out of the device and for 20 spreading the glue.
The nozzle system 1-4 of. Figures ~. and 2 con-tains feedex szleans fvr both the gluing substance 2 and air 1 as we~.1 as severs, nozzles 3 for the gluing sub-stance and arranged zn the shape of a cxrcle'i~n a ring-like way nozzles 4 for ai.x for feedzrig the g7.uing substance and air by spraya,ng them ~.nto 'the mixing chamber 7. Nozzles 3,4 are arranged in the feeder sur-face area 10 of .the nozzle system, such that the glu-ing substance nozzles,3 are'located symmetrically in the middle of the feeder surface area and the air noz-zles 4 are arranged in a circular way in one ring around the gluing substaz~.ce nozzles 3. Both the glui.xlg substance and the azx nozzles 3,4 axe directed such that a~large and good~conta.ct area is praduced between the partial flows of gluing substance and afar ~ arxd such that the partial flows mix to farm an essentially ho-mogenous mixture in the mixing chamber ~ before the actual foaming chamber 5, when the gluing substance and~a~.r partial flows are sprayed simultaneously from nozzles 3 and 4 into the mixa.ng chamber 7. bluing sub-stance 3 arid. air nozzles 4 8.re arranged iixtc~ ~tl3,e mix-ing chamber 7.
Fur~h.er the device in Figure ~, cosn.ta~.r~s means for raising and adjusting the pressure of air, pref ~5 erably to approximately 4 bar, prior to feedisrxg it into the foaming device. Additionally the device con-twins a means for adjusting airflow. Means for adjust-ing pressure and flow are not shown in the figure.
Further the device ~ . ~.n Fi.gure 2 contains a gluir~,g substance pump for pumping the glu~,rr,g substance from the glue storage container into the nozzle system and a flow adjustment meter far adjusting the desired speed, of flow. The pump and the flow adjustment meter are not shown in the figure.
.Additionally the device in Figure 1 Contains a temperature measuring probe axed a temperature ad-5ustment mearss, which are not shown in the figure, and are used 'to adjust the temperature of the glu~.ng sub stance-air mixture.
In a method application according to the in vention air, at a .pressure of abr~ut 4 bar, a.s directed anal gluing substance is pumped at a desired speed of flow into the foam3.ng device shown in Figure 1 through the nozzle system such that the partial flows of glu ing substance are sprayed from the nozzles in the cen tre and air is sprayed in a ring-like way around the sprays of gluing substance into the mixing chamber.
The gluing substance arid air nozzles axe directed in the mixing chamber such'that a large contact surface area is produced between. the gluing substax~ce and the air, in which case their homogeneous mixing occurs prior to their being directed into the actual foam~,ng area. In, the actual foaming area the homdgenous gluing substance-air mixture is foamed mechanically with the aid of beating means or ~.n. other words rotor plates.
Tla.e foamed g7.uing substance is directed to the gluE-spreading device for spxeadi~n.g for ~ the gluing of wood-based sheets and for jozn~.ng these sheets together.
Alterro.atively the gluing substance caxi, for example durirag a production standstill or during a temporary d3stux~bance, be directed into so-called foam extin-guishi.ng and be later recycled for foaming of the glu-ing~substance.
~ CA 02454707 2003-12-31 ,~ foami.x~g method and device accord~.ng to the increxxt~.ors are suitab~.e for vario~zs embodiments to achieve the necessary foaming of the glue ~rhen produc-ing differexa,t 'types of wood-based sheets.
Applications of the invention are nat limited to the examples described ratb.er they may 5rary ~.n the scope of the accompanying c3.aims.
Claims (10)
1. A method for the foaming of glue for the production of wood-based sheets, in which the gluing substance and the gas are brought into contact with one another and the gluing substance is foamed mechanically with the aid of the gas, characterized in that the gluing substance and the gas are mixed into an essentially homogeneous mixture prior to foaming, and the gluing substance and the gas are mixed by spraying them together as several directed partial flows such that the largest possible contact surface area is produced between the gluing substance and the gas.
2. A method according to claim 1, characterized in that the gluing substance and the gas are sprayed in a circular way such that the gluing substance is fed essentially from the centre and the gas from a ring around the gluing substance feed with the gluing substance and gas sprays being directed such that the gluing substance and the gas are brought into contact with one another.
3. A method according to claim 1, characterized in that the gluing substance and the gas are sprayed in a circular way such that the gas is fed essentially from the centre and the gluing substance from a ring around the gas feed with the gluing substance and gas sprays being directed such that the gluing substance and the gas are brought into contact with one another.
4. A method according to one of claims 1 - 3, characterized in that air is used as the gas.
5. A method according to one of claims 1 -4, characterized in that for the gluing -substance a composition is used that contains a combination of resin, foaming agent, filling agent and hardener.
6. A device for foaming glue for the production of wood-based sheets, wherein the device contains a gluing substance and gas nozzle system for the feeding of gluing substance and gas, and a foaming chamber and foaming means for foaming the gluing substance mechanically with the aid of air, and means for removing the foamed gluing substance from the device; characterized in that the device contains a mixing chamber , in which are arranged the gluing substance and gas nozzles of the nozzle system, that are directed into the mixing chamber to mix the gas and gluing substance to be fed into an essentially homogenous mixture prior to foaming, and the nozzle system is arranged to mix by spraying partial flows of gluing substance and gas from many directed gluing substance and gas nozzles in the mixing chamber such that the largest possible contact surface area between the gluing substance and the gas is produced.
7. A device according to claim 6, characterized in that the nozzles are arranged such that the gluing substance nozzles are arranged essentially in the centre and the gas nozzles around the gluing substance nozzles in a circular shape.
8. A device according to claim 6, characterized in that the nozzles are arranged such that the gas nozzles are arranged essentially in the centre and the gluing substance nozzles around the gas nozzles in a circular shape.
9. A device according to claim 6, characterized in that the nozzles are arranged in a matrix construction, in which the gas and gluing substance alternate across the entire feeder surface area.
10. A device according to one of claims 6-9, characterized in that the foaming means include rotor plates.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FIFI-20022291 | 2002-12-31 | ||
| FI20022291A FI119681B (en) | 2002-12-31 | 2002-12-31 | Foaming method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2454707A1 CA2454707A1 (en) | 2004-06-30 |
| CA2454707C true CA2454707C (en) | 2012-02-28 |
Family
ID=8565161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2454707A Expired - Fee Related CA2454707C (en) | 2002-12-31 | 2003-12-31 | Foaming method and device |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US7132023B2 (en) |
| EP (1) | EP1435267B1 (en) |
| CA (1) | CA2454707C (en) |
| FI (1) | FI119681B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080203871A1 (en) * | 2007-02-28 | 2008-08-28 | Michael Robinson | Door Insert Spacer |
| WO2010078413A1 (en) | 2008-12-31 | 2010-07-08 | Apinee, Inc. | Preservation of wood, compositions and methods thereof |
| US9878464B1 (en) | 2011-06-30 | 2018-01-30 | Apinee, Inc. | Preservation of cellulosic materials, compositions and methods thereof |
| TWI629247B (en) * | 2017-08-22 | 2018-07-11 | 阮慶源 | Microbubble generator |
| US11028727B2 (en) * | 2017-10-06 | 2021-06-08 | General Electric Company | Foaming nozzle of a cleaning system for turbine engines |
| KR20220008865A (en) * | 2019-05-17 | 2022-01-21 | 노드슨 코포레이션 | foam mixing system |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3965860A (en) * | 1970-10-15 | 1976-06-29 | Pacific Adhesives, Inc. | Plywood manufacture using foamed glues |
| US3749378A (en) * | 1971-05-28 | 1973-07-31 | Gen Foods Ltd | Producing a foamed liquid |
| US3941355A (en) * | 1974-06-12 | 1976-03-02 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Mixing insert for foam dispensing apparatus |
| US4400220A (en) * | 1974-11-27 | 1983-08-23 | Cole Jr Howard W | Suppression of respirable dust with foam |
| US4084795A (en) * | 1975-09-22 | 1978-04-18 | Vaughn Daniel J | Apparatus for manufacturing foamed plastics |
| US4059714A (en) * | 1976-08-02 | 1977-11-22 | Nordson Corporation | Hot melt thermoplastic adhesive foam system |
| US4396529A (en) * | 1978-11-13 | 1983-08-02 | Nordson Corporation | Method and apparatus for producing a foam from a viscous liquid |
| US4405063A (en) * | 1981-02-27 | 1983-09-20 | Nordson Corporation | Method and apparatus for controlling the density of dispensed hot melt thermoplastic adhesive foam |
| US4632314A (en) * | 1982-10-22 | 1986-12-30 | Nordson Corporation | Adhesive foam generating nozzle |
| US4630774A (en) * | 1982-10-22 | 1986-12-23 | Nordson Corporation | Foam generating nozzle |
| SU1139448A1 (en) | 1983-05-11 | 1985-02-15 | Научно-производственное объединение по термическим методам добычи нефти "Союзтермнефть" | Foam generator |
| FR2585467B1 (en) * | 1985-07-23 | 1987-09-25 | Commissariat Energie Atomique | APPARATUS FOR AUTOMATICALLY MEASURING THE APPARENT WEIGHT OF A LIQUID-LOADING SLUDGE, SYSTEM FOR AUTOMATICALLY MEASURING THE PONSAR INDEX OF SUCH A SLUDGE, USING THE APPARATUS, AND METHOD FOR MEASURING THE INDEX |
| US5356565A (en) * | 1992-08-26 | 1994-10-18 | Marathon Oil Company | In-line foam generator for hydrocarbon recovery applications and its use |
| US5427181A (en) * | 1993-06-14 | 1995-06-27 | Hale Fire Pump Company | Mixer for compressed air foam system |
| DE69402666T2 (en) * | 1993-09-28 | 1997-10-30 | Dow Corning Toray Silicone | Process for mixing a gas in a highly viscous liquid |
| US5492655A (en) * | 1994-05-31 | 1996-02-20 | Schuller International, Inc. | Air/liquid static foam generator |
| US6086052A (en) * | 1996-12-03 | 2000-07-11 | Rowe; Carroll G. | Foam generating apparatus |
| US6550750B1 (en) * | 1997-05-09 | 2003-04-22 | David Kalkstein | Apparatus for producing foamable compositions and other compositions |
| US6010083A (en) * | 1998-10-16 | 2000-01-04 | Betzdearborn Inc. | Apparatus and method for generating high quality foam using an air eductor |
| US6623154B1 (en) * | 2000-04-12 | 2003-09-23 | Premier Wastewater International, Inc. | Differential injector |
-
2002
- 2002-12-31 FI FI20022291A patent/FI119681B/en not_active IP Right Cessation
-
2003
- 2003-12-30 EP EP03396117A patent/EP1435267B1/en not_active Expired - Fee Related
- 2003-12-31 CA CA2454707A patent/CA2454707C/en not_active Expired - Fee Related
- 2003-12-31 US US10/749,463 patent/US7132023B2/en not_active Expired - Fee Related
-
2006
- 2006-01-03 US US11/324,614 patent/US7513488B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| FI20022291A (en) | 2004-07-01 |
| CA2454707A1 (en) | 2004-06-30 |
| US7132023B2 (en) | 2006-11-07 |
| EP1435267A1 (en) | 2004-07-07 |
| FI20022291A0 (en) | 2002-12-31 |
| US7513488B2 (en) | 2009-04-07 |
| US20060113044A1 (en) | 2006-06-01 |
| EP1435267B1 (en) | 2012-03-07 |
| FI119681B (en) | 2009-02-13 |
| US20040213079A1 (en) | 2004-10-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20141231 |