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Патент USA US2410526

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Nov. 5, 1946.
J. A. RosMArr>
2,410,526
' lPULP s'rocx FLOW CONTROL
Filed Oct. 2L 1944
2 sheets-sheet 1
Nov. 5, 1946.
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.L A._RosMArr
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Filed Oct. 2, -1944
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2,410,526
PULP, STOCK FLow „CONTROL
2 Sheets-*Sheet 2
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PULP s'rocu rLoW coN'raoL
.lohn A. Rosmait, Appleton, Wis., assìgnor to D. J.
Murray Manufacturing Co., Wausau, Wis., va l -
corporation of Wisconsin
Application Gctolier 2, 1944i, Serial No. 556,796 .
il Claims. (ci. ca_-ic)
.
l.
2
This invention relates generally to improve
ments in the` 'art 0f paper making, and relates
more particularly to improvements in the con- '
struction and operation of mechanism for collect-ing, spreading and controlling the flow of effluent
or pulp stock as it is discharged from the screens
. to the head boxes of paper manufacturing ma
chines especially of theF-ourdrinier type.
The primary object of my present invention is
to provide an improved mode of collecting, dis
tributing and controlling the flow of efüuent stock
as it passes from the screens to the head box of
a Fourdrinîer type of paper making machine or
the like.
’ ’
The consistency of efduent or pulp stock deliv
ered from the screens toward the Fourdrinier
wire of Well known paper making machinery, is
iluent stock at laterally spaced intervals into the
lower portion of the ñrst pass of the head box,
which pass is ordinarily a relatively deep rec
tangular space having an upper outlet communi
cating'vvith the second pass. The violent injec
tion of the fibre bearing stock through these sev
eral outlets and the drastic change in direction
of ‘iiow produced thereby, further reduces the ve
locity of ilow Within the head box and interferes
with uniformity in paper production. Then too,
at the higher speeds of these paper making ma
chines, the level of the liquid in the head box be
tween the first and last passes, is not nearly as
high as during low speed operation, but at high
speeds the level in the head box as a whole should
be at a. maximum'. The relative elevation of
the screens _with respect to the Fourdrinier wire,
is therefore dependent upon the maximum speed
of the‘machin'e, and the elevation of the screen
relatively low, that is, it has practically the fluid
ity of Water and contains only from one-tenth
to three-tenths of solid matter such as ñbres, in
outlets must be suñîcient to insure proper ca
suspension. Depending of course upon the so 20
pacity of flow through the piping headers and
called freeness or “slowness” of the stock, even
head box and to constantly overcome al1 hydrau- at these low consistencies there is a deñnite tend
lic losses. lf, therefore, hydraulic losses are en
ency for the fibres to settle or ilocculate into
countered due to the use of ine?ñcient conduits
small bundles, thus producing lumpy and ex
between the screen and head box, raising of the
as
tremely undesirable formations. This condition
screens in an eiîort to obviate such losses, aug
is aggravated by aeration, turbulency, cross
ments the undesirable condition Whenever the
apparatus is operating at low speeds at which
box and through the customary pipe headers, T’s
the levels in the head box are far below the top,
and elbows connecting the surge box with the 30 andl only a fraction of the high speed levels is
iirst pass of the head box. The use of this prior.
needed above the wire deck for the production of
type of conductors results in the production of'_
heavier weight paper. Under such operating
numerous sharp turns, corners, and quiescent
conditions when utilizing lesser flow capacities
zones in which eddy currents and badly settled
and -somewhat; higher pulp consistency in the
íiows, etc. as the fibre stock passes from the’ surge
areas are constantly formed, thus causing sliml7 35 prior circuitous conduits ` together with high"
pulp formations to momentarily lodge and to
screen elevations, cascading resultsand makes it
subsequently break loose and to create lumps,
practically impossible to produce sheets of paper
holes, and spots in the ñnal paper. This prior
of proper texture and thickness.
type of header piping also results in consider
able lossin velocity head due to the sharp en
trance of the stock and the subsequent multiple
bends, and requires the screens to be located at
It is therefore a more specific object of the
present invention to provide an improved system
of stock iiow kcontrol from the screens to the wires
of> a Fourdrinier type" of paper making machines,
elevations suíiiciently >high to compensate for
which eliminates all of the above mentioned diñîl- e
these hydraulic losses and to properly deliver the
culties, and which enables eílicient production of
eñìuent stock into the first pass of the'head box 45 paper of desired thickness and substantial uni
against the relatively high static head existing
formity and any desired practiced speeds.
therein. and this static head must constantly be
Another speciñc object of this .invention is to
maintained sufficient to accomodate the high
provide improved apparatus for controlling the
est speeds at which the machinery is operable.
flow of eilluent stock from a. surge box or the like
In these prior paper making systems, the last 50 to the ilrst passA of the head box of a paper mak
connection of the piping header usually termi
ing machine, embodying a minimumy number oi
nates in three or moreoutlets, depending .upon
turns or changes in direction of flow, and of such
y the width of the Fourdrinier wire; and these out
formation that hydraulic losses are minimized
lets are slots or holes cut into the rear wall of
and excessively high screen elevations are made
the head bon and are
to _mscharge the
55
unnecessary.
-
'
ananas
4
.
While the invention has been shown and de- '
lA further specific object ofthe invention is to
scribed herein as being especially adapted for use
in connection 'with Fourdrinier paper making
machines of variable capacity and characteristics,
provide an improved conduit assemblage for con
ducting ñbre pulp stock from the screens to the
head box of a paper producing machine, wherein
the velocity of íiow of the liquid delivered from
'the surge tank is gradually decelerated and con
it is not my desire or intention to unnecessarily
restrict the scope or utility of the improved fea- v
tures by virtue of this speciñc application thereof.
Referring especially to Fig. 1 ofthe drawings,
the
typical paper making installation shown dia
pass of the head box under all conditions of op
10 grammatically therein, comprises in general, a
eration.
^
battery of pulp screens` I0 which are normally
Still another specific object of my invention is
abundantly supplied with‘efliuent or pulp stock
to provide improved mechanism` for eiïecting uni
Il from a dow box I2 by a fan pump I3, and
form delivery of the eñluent pulp stock into the
having screen outlets I4 of well known construc
.first pass of the head box of a paper making ma
tion for delivering the eiiluent stock II into a
chine, throughout _the entire width of the box
surge
box I5; an endless Fourdrlnier wire I6 of
and in parallel directions, and for regulating or
verted into pressure energy sufllcient to eil'ective- '
ly overcome thestatic pressure head in the first
any suitable width coacting with breast and couch
rolls i1, I8 respectively, and having a slice or
controlling the now into' the head box _so as to
produce smooth entry andv to avoid undesirable
turbulency and agitation.
. inlet I9_ which normally receives the pulp stock
'
An additional specific object of this invention is- 20 I I from a multiple pass head box 20 of usual con-v
struction; and one orv more now decelerating
to provide improved instrumcntali-ties for con
tubes 2l, now spreaders 22, and flow control gates
ducting the stream of pulp stock through a paper
23 of improved structure interposed between the
making machine, in a manner which will avoid
surge box- I5 and the lower rear inlet end of the
,
` "
eiliuent stock and causing the liquid to flow in a 25 head box 20.A
The improved iiow control assemblages em
solid and smooth stream throughout its course.
bodying my present invention and which are
Another speciñc object of the invention is to
adapted to be interposed between the surge box
provide a simple and compact flow distributing
I5 and the head box 2U, may be constructed as
and control unit which may be used either singly
or in multiple and applied to either existing or 30 units of any desired capacity adapted to be
utilized either singly or in multipledepending
new paper making installations at moderate cost,
upon the width of the Fourdrinier wire I5, and
so as to insure proper now under varying condi
. eddy currents while aiding in deaeration ofthe
the decelerating tubes used in these improved as- v
tions of operation, and which ‘is also highly ñex
semblages may also be of diiïerent types.>
As speciñcally illustrated in Figs. 2 to 5 in
35
operation.
»
These and vother speciñc objects and advan-> ` clusive, the ñow deceleratîng tube 2I of each unit,
comprises a frustro-conical upright sheet metal
tages of my invention will be apparent from the ,
ible in its adaptations and efficient in normal
following detailed description.
tube having circular cross-section ‘throughout its
»
length but beingof gradually enlarged diameter
A clear conception of the features constituting
the present improvement, and of the construction 40 from its upper inlet to its lower outlet. Each
frustro-conical tube is provided with a series of
and operation of several typesof my improved
four internal radial vanes 24 the inner edges of
ñow control mechanism, may be had byreferring
which are parallel and terminate in a common
to the drawings accompanying and forming a
part of this speciñcation wherein like reference ' circle concentric with the tube axis. The upper
smaller inlet end of each decelerating tube 2I is
characters designate the saine or similar parts
in
direct and open communication with the lower
in the various views.
outlet 25 of the surge box I5, and the lower en
Fig. 1 is a diagram or now sheet illustrating
larged outlet end of the tapered tube 2| is pro
a typical Fourdrinier type of paper making in- ‘
vided with a cylindrical apron 26 which is in open
stallatìon showing the general location of my im
'proved apparatus;
Fig. 2 is a somewhat enlarged part sectional
side elevation of the improved flow control uni-t »
showing the same associated with the screen out
let, surge box and head box the latter being shown
in section;
`
Fig. 3 is a rear view of the assemblage shown
in Fig. 2, embodying a single improved dow con
trol unit;
_
‘
Fig. 4 is a further enlarged central vertical
Y section through a type of the improved flow con
-trol unit having a ñow decelerating tube which
is of circular cross-section throughout its length;
Fig.` 5 is a. top view of a single now control unit
such as shown in Fig. 4;
Fig. 6 is a still further enlarged vertical section
vthrough one of the dow regulating gates of my
improved control assemblages;
Fig. 7 is a part sectional top view of another
communication with the adjacent spreader 22;
As particularly illustrated in Figs. '7 and 8,' the
slightly modiñed flow decelerating tube 2|' of
each unit, comprises an upright sheet-metal tube
having gradually downwardly expanding cross
sectional area of circular cross-section at its
smaller top or inlet end and of elliptical cross- -
section at its enlarged bottom or outlet end. This
modified tube 2l’ is also provided with a. series of
four internal radial vanes the inner edges of '
60 which are parallel, and the smaller inlet end of
the decelerating tube 2|' is adapted to communi
cate directly with a surge box outlet 25 while the
lower elliptical outlet end is provided with an
apron 2Iì'` havingA uniform elliptical transverse
' cross-section with the major axis of the ellipse
lying in a plane extending across the end of the
head box 20 and transversely of the direction of
ì now through this box.
The improved iiow spreaders 22 are adapted to
type of the improved flow decelerating tube, hav
cooperate
with either type of ydecelerating tube
70
ing circular cross-section at the top and elliptical
2I, 2|', and each of these spreaders 22 comprises
cross-section at the enlarged bottom portion
a sheet metal casing which is laterally widened
thereof; and
or spread out to the full width of a small standard
Fig. 8 is a somewhat diagrammatic top view of
head box 20 as in Figs. 3( and 5, or to one-half
a multiple installation _of my improved ñow con
trol unit.
` »
76 the width ot a larger head box 20 as in Fig. 8, or to
2,410,526
5
one-third of a still larger box in installations of
still greater capacity. The width of the spreaders
22 may be standard in the individual flow control
units, and each spreader casing has an inclined
bottom 21 directly beneath the apron 28, 28' of
the adjacent central decelerating tube 2|, 2|', and
zontal, by the inclined bottom 21 of the spreader
v 22 andthe stream is further decelerated, spread
and widened out to the full width‘of the outlet
slot 28, by the rear. top and bottom walls o! the
spreader casing'. The partitions 30 within the _
spreader 22 also function to prevent eddies in
the advancing spreading stream and to divide Athe
same into segregated adjoining parts flowing
pass 29 of the adjacent head box 20. Diagonal
through the slot 28 in substantially parallel di
partitions 30 which radiate from the central axis lO rections. As the effluent stock flows through the
of the corresponding decelerating tube and which
nozzles 3| and past the gates 23 it enters the,
also has a front lower outlet slot 28 communicat
ing with the extreme lower rear end of the ilrst
divide the slot 28 into three parts of equal length,
are also provided within each spreader 22, and
these partitions may be either plane as in Fig. 5
or curved slightly away from- the central plane- of
the spreader as in Fig. 8.
.
-As indicated in Figs. 2, 4, 5 and 6, my improved
ilow regulating gates 23, _are ilexible -elongated
lower portion of the iìrst pass of the head box
20 at relativelyy high velocity but without turbu
lency or excessive agitation, and under pressure
suiñcient to overcome the> static head of the liquid
within the pass 29. The individual gates 23 may
be readily adjusted with the aid of their manipu
lating rods 34 and handwheels 38 so as to insure
smooth entry of the liquid' stock into the head box
elements swingably suspended from spreader noz
zles 3| which are in open communication with the 20 20 throughout the entire width thereof, and the
spreader slots 28. As shown, -there are three in
entering eil‘luent stock subsequently flows through
dependent gates 23 associated with each spreader
the successive passes 'of the head box and is
22, and each. gate is secured to the adjacent noz
leventually deposited upon the Fourdrinier wire
zle 3| by means of a curvedplate 32 and cap
I6 through the inlet I9. In this manner the im'
screws 33, and is adapted to be swungl from one
proved ilow control mechanism gradually con
dot-and-dash line position to> another as illus
ducts the ñbre stock from the surge box |5 to
trated in Fig. 6, by Vmeans of an independently
the head box 20 with but a single gradual change
adjustable actuating rod 34, all of which extend
in direction of flow, while simultaneously con
upwardly through the ilrst pass 29 of the head
verting the velocity of ilow into pressure energy
box 20. The lower end of each adjusting rod 36 30 suiïiclent to overcome thgstatic head and also
extends through a slot 35 formed in a tubular bead
avoiding turbulency and eddies.
`
36 formed at the outer swinging end-of the ad
From the foregoing detailed description of the
jacent gate 23, and is provided with an integral
construction and operation of my improved pulp
transverse bar 31 snugly engaging the correspond
stock flow control system, it should be apparent
ing bead 36. The upper end of each adjusting
35, that the invention provides control mechanism
rod 3d is screw threaded and coacts with a hand ’
whichbesides being simple and compact in con
struction, is also highly eillcient in operation and
in a bracket 40, and each rod 34 is also provided
functions automatically after the gates 23 have
with upper and lower stop collarslll l, 42' for limit
been set to meet desired operating conditions.
ing the opening »and closing ,of the gates 23, see 40 The
improvement may obviously be embodied in
Fig. 4. 'I'he swinging gates 23 cooperate with the , units of predetermined capacity adapted to be
bottom of the head box 20 to provide sniooth
used either singly or in multiple, and each unit
transition slots leading into the ñrst pass i9,> and
is capable of eiîectively collecting, decelerating,
these gates may be independently adjusted so as
_distributing and controlling the flow of liquid
to provide for diiïerent delivery openings at differ
therethrough, and is devoid of multiple bends,
wheel 38 having a hub 39~journalled for rotation
ent portions of the slots 28 and nozzles 3|.
v
corners, and quiescent zones in which ñbres are
apt to fiocculate or gather. While the circular
decelerating tube 2| and apron 26 may perhaps
utilized either singly as in Figs. 3 and 5, or in
be more readily constructed and applied to the
multiple as in Fig. 8, and their use in multiple is 50 spreader 22, the elllptic'al or oval type of tube 2|'
not necessarily limited to two units. These units
and apron 28’ facilitates lateral vspreading and .,
may also be applied either to new installations or
distribution of the eilluent stock, and both types
to existing installations having Fourdrinier wires
of'tubes as well as the spreaders 22 may be
I6 of standard widths, thus facilitating manufac- .
readily
constructed of sheet metal and at ex
ture of the units in large lots and application
ceedingly moderate oost. The use of the baiües
thereof to the paper making machines. Since the
24 in the decelerating tubes and of the partitions
normal functioning of the circular and elliptical
30 in the spreaders 22, eliminates swirling and
sectioned tubes 2|, 2|' is substantially the same,
'turbulency and aids in proper distribution of the
it will suñice to describe the normal operation of
stock, and the independently manipulable gates
only one of these alternative structures.
As previously indicated, the improved ilow de
celerating spreader and regulating units may be
During normal operation of the improved iiow 60 23 enable. the operator lto readily and eñectively control units, the screens I0 will be receiving an _ control the iiow so as to insure uniform distribu
tion throughout the entire width of the head
abundant supply of pulp stock || from the ñow
box 20. It-is also noteworthy that with my im- .
box l2 past the fan pump I3, and after treating
the eilluent stock, the screens deposit the ma 65 proved assemblage, the single change in direction.
of flow of each» stream. is accomplished at the
terial into the surge box i5. From the surge
point of maximum ` cross-sectional area' and
box i5, the ?lbrous pulp ii flows through the
minimum velocity thereof and just prior to final
youtlet opening 25, into the decelerating tube 2|
distribution and injection of the liquid into the
wherein the velocity of iiow is gradually deceler
ated due to the gradually increasing cross-sec 70 head box, 'thus permitting most emcient and
smooth spreading of the eiïluent stock without
tional area, while excessive swirling or whirling
creating undesirable disturbances. The depend-~
oi’ the stream is prevented by the radial 'vanos
ing aprons at the lowervends of the expanding
2c. Following this initial deceleration of .the
decelerating
tubes, also enhance the ñnal spread-A
advancing pulp, the direction of ilow ls gradually
and distribution, and-the gates 23 may be
changed from vertical to approximately hori 75 ing
readily formed of ñexible sheet material and are
l
2,410,526 `
8
movable within predetermined fixed limits to
pressure, and nozzles for delivering the spread
tion of the gates 23 and their actuating mech
anisms, also insures maximum life thereof 'and
ible between the _surge and head boxes of 'a
paper making machine, said unit comprising, a
. downwardly enlarging tapered tube for initially
stream under pressure created by said tube and
provide efficient extensions of the final nozzles
spreader into> the lower end of the iirst pass of
3l for insuring streamlined and smooth injection
the head box.
of the nuent stockunder pressure, into the head
5. A decelerating and ilow control unit insert- '
box 20. Ilî'he improved construction and forma fil
enables> the operator to conveniently adjust the
several independent gates from a remote and
accessible station.
~
decelerating the flow of efiluent stock discharged ‘
10 into the tube from the surge box and for convert
ing velocity energy thereof into pressure, a
It should be’ understood that it is not desired
to limit this invention to the exact details of
construction or to the precise mode of operation,
herein shown and described,_for various modiii-'4
cations within the scope of the appended claims 15
" may occur to persons skilled in the art.
I claim:
‘
spreader in open communication directly with
the outlet end of said tube for changing the dl
rection of flow of the initially decelerated stream
and for spreading it laterally, partitions within
said spreader for dividing the stream into seg
regated parallel ilow sections, and nozzles for
V
-delivering thespread stream under pressure cre
ated by said tube into the lower end of the ñrst
pass
of the head box.
initially decelerating the ilow of efiiuent stock 20
6. A decelerating and iiow control unit insert
discharged from the surge box and for converting
ible between the surge and head boxes of a
its Velocity energy ~into pressure, means for
paper making machine, said unit comprising, a
l. In combination with the surge andA head
boxes oi a paper making machine, means for
spreading> the stock while under considerable
downwardly enlarging tapered tube for initially
pressure and as it ñows away from said deceler
decelerating the flow of efñuent stock discharged _
ating means, means for directly delivering the 25
into the tube from the surge box and for con
spread stock under pressure into the lower por
verting velocity energy thereof into pressure, a
tion of `the ñrst pass of the head box'throughout
spreader in open communication directly with
the entire width of the latter, and means for
the outlet end of said tube ~for changing the di
locally varying the cross-sectional area of said
rection of now of the initially decelerated stream
delivery means to insure uniform distribution of ,
30
the stock.
>
v
2. In combination with the surge and he'ad
boxes of a paper making machine, means for ini
tially decelerating the flow of eilluent stock dis
charged fr`om the surge~box and for converting 35
velocity energy thereof into pressure, means for '
and for spreading it laterally, nozzles for deliv
ering the spread stream under pressure created
by said tube into the lower end of the iirst pass
'of the head box, and independently adjustable
gates for controlling the ñow through said noz
zles.
'
7. A decelerating and flow control assemblage
for paper making machineshaving surge and
preventing swirling of the stock as it passes
through said decelerating means, means for lat
head boxes, said assemblage comprising, a down
erally spreading the stream of stock flowing out
wardly
expanding upright tube having itssmaller
of said de'celerating means and for, further con 40 upper linlet enddirectly communicable with the
verting velocity energy thereof into pressure, and A surge box, said tube having circular transverse
means for directly delivering the Ispread stock
>`cross-section at its `upper inlet end and oval
under considerable pressure into‘the lower pori;- ~ transverse cross-section at its lower outlet end,
-tion of the first pass of the head box.
¿a .spreader _in open communication with the
3. In combination with the surge and headÄÍ` -large'r'lower outlet end of said tube and having a
boxes of a paper making machine. means tor-'1'1
initially decelerating the new of eilluent stock> ï, Äfbottomidïsposed Ín’vertica'l aunement With the
"
'_tubeltor changingthe flow from vertical to ap
discharged
ing velocityfrom
energy
thethereof
surge box
into and
pressure„`
for convertmeans . f _.proximately_,>hori__zontal, and independently ad
for preventing swirling of the stock as it passes
through said decelerating means, means for lat
l’_iusizable. means," ior regulating the delivery of’
erally spreading the stream of stock ñowlng out
of said decelerating means _and for further con-`
eiiluent stock from said spreader into the- lower
portion` of the head box at various localities l
throughout its width.
`
-
.8. Afidecelerating and flow control assemblage
verting velocity energy thereof into pressure,
,meansv within said'spreading means for Segre-5„ fun-’1' paper making machines having surge and
head boxes, said assemblage comprising, a down
gating the stock into a plurality of .parallel-_ ;¿wardly expanding upright tube having its smaller
streams, and means for directly delivering’the
upper inlet end directly communicable with the
>spread stock under considerable pressure into '
surge box, a spreader in open communication
with the larger lower outlet end of said tube
4. A decelerating and ilow controlunit insert 60 and having a bottom disposed in vertical aline
ible between thesurge and head boxes of a paper
ment with the tube for changing the flow from
` the lower portion of the first pass of the head box'.
making machine, said unit comprising, a down
wardly spreading tapered tube for initially decel
erating the flow of emuent stock discharged into
the tube from the surge box and for converting
velocity energy thereof into pressure, varies inv
said tube for preventing whirling of the liquid
nowing therethrough, a spreader in open com
munication with the outlet end of said tube for
changing the direction of ilow of the 'initially 70
decelerated stream and for spreading it laterally
' to further convert velocity energy thereof into
vertical to approximately horizontal, means with
in said spreader for dividing the flow therein into
segregated parallel streams flowing toward the
head box, and lindependently adjustable means
-for controllably admitting said streams under
. pressure to' the head box through the several ‘
divisions‘and throughout substantially the entire
width of the box.
,
,
JOHN A. ROSMAIT.
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