POWDER BLASTING NOZZLE FOR OSB BLENDER AND SPRAY SYSTEM OF LIQUID CATALYST OR WAX EMULSION FOR ANCHORING OF POWDER ON SURFACE OF STRANDS-WAFERS

BUSE DE PROJECTION DE POUDRE DE MELANGEUR POUR PANNEAUX OSB (PANNEAUX DE PARTICULES ORIENTEES) ET SYSTEME DE PULVERISATION DE CATALYSEURS LIQUIDES OU D'EMULSION DE CIRE PERMETTANTD'ANCRER LA POUDRE A LA SURFACE DES GRANDES PARTICULES

English Abstract

The present invention relates to a new method of applying powder resin
combined with a liquid catalyst (to speed curing of powder in pres) or wax
emulsion on
strands of wood that are used to manufacture OSB (oriented strand board). The
application of
the powder resin and catalyst or wax emulsion take place in rotating blender,
in situe.

Claims

CLAIMS
1) We claim design of P.B.N. to distribute powder from the main header
on air born strands.
2) We claim design and placment of enclosure of liquid nozzles, to insure
synergical spray-blow of anchoring liquids and powdered ashesive.
3) We claim improvement in strenght and wet properties of panel.
4) We claim the impact of flexibility in using liquid-powder combination
on economy of production cost of binders in users plants.
5) We claim the powder-dust suppression (by anchoring liquids) during
blending in large industrial blenders.
6) We claim successful plant trial of liquid-powder spray-blowing
nozzles, using first build prototype of P.B.N. and J.M. Brooks liquid
nozzles.

Description

CA 02281388 1999-09-07
-1-
POWDER BLASTING NOZZLE FOR
OSB BLENDER AND SPRAY SYSTEM
OF LIQUID CATALYST OR WAX EMULSION
FOR ANCHORING OF POWDER ON
SURFACE OF STRANDS-WAFERS
INVENTOR : MIROSLAV LUPTOVSKY N.A.S. 482-494-572
735, rue Neree Tremblay, app. 301
Sainte-Foy (Quebec) Canada G1V 4W5
ASSIGN TO : ML'S CONSULTING INC.
(Matricide 1148491757)
735, rue Neree Tremblay, app. 301
Sainte-Foy (Quebec) Canada G1V 4W5
ABSTRACT : The present invention relates to a new method of applying powder
resin
combined with a liquid catalyst (to speed curing of powder in pres) or wax
emulsion on
strands of wood that are used to manufacture OSB (oriented strand board). The
application of
the powder resin and catalyst or wax emulsion take place in rotating blender,
in situe.
RELATED PARTS OF TECHNOLOGICAL STEPS
-1- -2- _3_
WAX EMULSION AND POWDERED ADHESIVE IS BLENDER
DRIED STRANDS LIQUID CATALYST ARE BLASTEED AGAINST THE
APPLIED DIRECTION OF STANDS MOVEMENT
-4- -5- _6_
COATED STRANDS STRANDS PASS THE MAT IS FORMED
ARE STORED FORMING STATION
_7_ _8_
MAT IS PRESSED UNDE FINAL PRODUCT IS OSB
'HEAT AND PRESSURE PANEL

CA 02281388 1999-09-07
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BRIEF DESCRIPTION OF THE PRESENT INVENTION pND IMPLICATION
Powder blasting nozzle Figure 1. (Further P.B.N.) is used in the application
of powdered
adhesive into a rotating drum. The neccessary blasting force to blast powder
is created by two
or single source of compresed air. Primary air is supplied by main blower,
which is currently
used to deliver powder into one exit orifice usually at the infeed of the
rotating blender.
The secondary source of compressed air is what makes this invention special
equaly
distributes the total quantity of powder through several orifices from the
main delivery pipe,
via P.B.N. (Figure 2).
Figure 3 is a cross section view of the powder blowing nozzle.
PHOTOGRAPH
1) Assembled P.B.N.
2) P.B.N. in parts
3) Laboratory demonstration of blowing of powdered adhesive
throught P.B.N.
4) Control panel for dosing of anchoring liquid
5) Applicator of liquid catalyst or wax emulsion and liquid catalyst
6) Actual test of the protoype for combo blending (anchoring liquid and
powder adhesive
7) Degradation of sample of O.S.B.panel (sample in the middle) due to
the unique surface property of strands (shiny surface) samples on
each side are powder blowen and anchored by wax emulsion and
liquid catalyst

CA 02281388 1999-09-07
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The existing powder systems deliver the required amount of the powder resin
through a pipe
usualy located near the infeed chute of the blender. These simple systems do
not influence the
distribution of the powder on the strands that are coated with wax emulsion.
The conventional way of distributing the powder resin is to dump it into the
blender and let the
tumbling of the equipment do the work. The probability of even distribution of
the powder
resin is totaly dependant on the residential time the strands in the blender.
(dwell time), the
RPM of blender, the humidity of the strands, angle of the blender, the wax
dosage, the power
dosage, etc..
It has been determinated that the distribution on the powder resin on the
strands in industrial
blenders can be improved by «blasting» or in other words blowing the powdered
adhesive
against the flow of strands, in the blender.
The jets of air-powder resin come in contact with the airborn strands forcing
them to twist
more frequently, while they are « air bom » during dwell time in the blender.
The end result is
that strands or wafers exiting the blender have uniform and superior
distribution of anchored
powder on both sides of strands or wafers.
Ultimatly the wafers or strands have a more «EFFECTIVE COVERAGE» of anchored
powder in
the droplets of liquid catalyst or wax emulsion and this way coated strands or
wafers give the
manufacturer a superior product. It has to be stressed that choice of
dirrecting the jets of
powder and liquid anchoring droplets (catalyst of wax emulsion) allows user of
such blending,
to achive permanent residency of droplet-powder grain combination on surface
of strands or
wafers. Since it is essential for panel of OSB or waferboard to have high
strength and mainly
uniformity of properties, through the whole area of panels, such described
coverage of strands
or wafers will insure that.

CA 02281388 1999-09-07
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In the case when hardwood species are used to make strands or wafers, powdered
resin has a
tendency to fall off the strands, due to the smoothness of the surface of
hardwood strands or
wafers. To compensate this fact, wax emulsion or liquid catalyst (for
catalysing the powder),
can be used in situe with powdered resin, to anchor the powder to the surface
of the hardwood
strands or wafers.
EXAMPLE
Hardwood species (sweat gum) and southern yellow pine, birch, were used to
prepare strands
in pilot plant flaker. Such mixture of strands were blended three different
ways.
FIRST WAY : 1% wax emulsion was sprayed of strands, than 2.3% Phenolic powder
was added is one dosage strands were than tumbles in rotating blender
for 4 minutes and than stored for a mat forming.
SECOND WAY : 1% wax emulsion was sprayed on identical mixture of strands,
follow
by 2.3% Phenolic powder blowen via P.B.N. for time of 45 seconds.
Then blender was stopped and coated strands were stored for a mat
forming.
THIRD WAY : 1 % wax emulsion was sprayed on identical mixture of strands, 1
liquid catalyst (on mass of wood) was sprayed through J.M. Brooks
liquid nozzles simultaneusly with 1.3% Phenolic powder blowen
through P.B.N. Also in this case liquid catalyst and Phenolic powder
were spray-blowen within 45 seconds (dwell time), coated strands
were stored for mat forming.
24X24 three layers panels were pressed for 2 minutes 40 seconds (day
light to day light) at 190°C.
Adhesives (surface and core powders as well as liquid catalyst were
used in this experiment).
Random oriented mat was hand formed and panels were pressed.
Target density was 42 lb/ft3.
PANELS per each way were presse to insure validity of results.

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RESULTS:
Applicataion of 1 way 2 waY 3 waY
Adhesive in blender
52 75 88
IB'S PSI
Thicleness swell 21.7 16.5
16.3
24 hours
ova

Representative Drawing