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Патент USA US3091573

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May 28, 1963
FlledAug
3,091,563
H. MEYER
METHOD OF AND APPARATUS FOR QUTOKLY AND SAFELY
wTTHDRAwING WATER FROM FIBER sUsPENsIONs
1o, 1959
2 Sheets-Sheet 1
24
27
25
" W monononvm
INVENTOR.
Áér/,Äerf ße/Veh
BY
-
@Mx-(4,”.
May 28, 1963
H. MEYER
:£091,563
METHOD OF AND APPARATUS FOR QUICKLY AND SAFELY’l
WITHDRAWING WATER FROM FIBER sUsPENsIoNs
Flled Aug
l0, 1959
2 Sheets-Sheet 2
United States Patent On ice
1
3&91563'
Patented May 28, 1963
2
3,091,563
rolls and a continuous pressure increase will form in said
passage. The suspension above the wire will thus pass
into a chamber with decreasing volume while the water
FIBER SUSPENSIONS
Heribert Meyer, Chillicothe, Ohio, assignor to I. M. Voîth
meshes of the wire, and a sheet will be formed on the
METHGD OF AND APPARATUS FÜR QUICKLY
AND SAFELY WITHDRAWHNG WATER FROM
G.m.b.H., Heidenheim (Brenz), Germany
Filed Aug. 10, 1959, Ser. No. 832,657
Claims priority, application Germany Aug. 14, 1958
16 Claims. (Cl. 162-217)
contained in the suspension will flow oli through the
wire. One of the drawbacks of this type of apparatus
consists in that the wire is freely suspended over a larger
distance over which it sags so that the wire is rather
stressed over said distance. Another disadvantage of this
apparatus consists in that, regardless of the direction of
The present invention relates to a method and appara
tus for withdrawing water in a quick and iiber-saving man
ner from íiber suspensions, from which paper sheets, car
rotation of the upper roll, a sub-atmospheric pressure will
form behind the point of contact of the upper roll with
the sheet surface, which sub-atmospheric pressure is able
ton sheets or the like are made, by means of a breast roll
to lift off and throw off at least a portion of the formed
designed as suction roll.
15 sheet.
It is well-known that generally in a paper making ma
It is, therefore, an object of the present invention to pro~
chine, the water is withdrawn from the paper sheets in the
vide a method of and device for withdrawing water from
wire portion which latter consists primarily of a breast
fiber suspensions such as paper pulp or paper stock in a
roll, table rolls, suction boxes and a wire suction roll. In
quick and fiber-saving manner, which will overcome the
view of the relatively great number of these elements
above mentioned drawbacks.
required for a satisfactory Withdrawal of the water, such
lIt is another object of this invention to provide a method
wire portions are rather long, particularly if they are de
of and apparatus for a quick and safe withdrawal of water
signed for high machine speeds.
from iiber suspensions, which will assure a uniform and
Therefore, in order to speed up Ithe water withdrawal
careful sheet formation and a good felting of the íibers.
operation, in other words, in order to increase the speciíic 25
It is still another object of this invention to provide a
water withdrawal and thereby to reduce the wire portion,
method and apparatus of the type set forth in the preced
it has been suggested to design the breast roll as suction
ing paragraphs, which will bring about an increased with
roll and to Ithis end to provide a suction box in the roll.
drawal of water from the suspension so that a number of
Such suction box was designed either with stationary walls
the heretofore required table rolls and in some instances
or with walls adjustable along the circumference of the 30 also suction boxes will be saved.
suction roll. For purposes of obtaining a quick with
A further object of this invention consists in the provi
drawal of the water, a low or sub-atmospheric pressure is
sion of a method and apparatus as outlined above, which
always maintained during the operation in the suction box
will greatly save the very iine stock material contained in
which low pressure is produced by a suction pump con
the suspension.
nected to one or both sides of the suction roll. This pump
Still another object of this invention consists in the
simultaneously withdraws the waste water passing from
provision of a method of and device for withdrawing
the suspension through the wire into the box. The with
water from iiber suspensions for making paper sheets, car
drawal of water by means of such breast rolls is, however,
ton sheets and the like, which will result in the formation
rather limited, While these relatively narrow limits are
of a low or sub-atmospheric pressure which will steadily
caused by the structurally possible design of the lateral 40 change in the direction of movement of the sheet being
discharge conduit, especially the cross section thereof.
formed while the pressure will be constant over the width
Therefore, the heretofore known breast-suction rolls are
of said sheet.
hardly able to conduct away the great quantities of water
These and other objects and advantages of the inven
which have to be discharged at the start of the water with
tion will appear more clearly from the following specifica
drawal operation. Furthermore, the lateral discharge of 45 tion in connection with the accompanying drawings, in
the waste waters or the lateral arrangement of the low
which:
pressure producers may bring about pressure differences
FIG. l is a section of a diagrammatic side view of an
over the width of the sheet as a result of which a regular
apparatus according to the present invention.
sheet formation will ensue.
FIG. 2 represents a portion of a longitudinal section
A particular disadvantage of breast-suction rolls of the 50 through the breast-suction roll of FIG. 1 but on a smaller
type involved consists in that the suction box is~characscale than that of the latter.
terized by a substantially constant pressure course in the
FIG. 3 shows «a special `design for the drive of the ec
direction of movement of the sheet being formed. As a
centric roll.
result thereof, the suspension, when reaching the suction
FIG. 4 illustrates `similar to FIG. 2 illustrates simil-ar to
zone, is instantly subjected to a great pressure diiference 55 FIG. 2 `a portion of a longitudinal section of a modified
so that the suspension is practically “slammed” against the
breast-suction roll which is equipped with :an adjusting de
wire with the result that a great portion of the finest iibers
vice for the eccentric roll.
contained in the suspension drops through the meshes of
FIG. 5 is a View of the arrangement shown in FIG. l as
the wire. Therefore, in order to avoid such sudden in
seen in the `direction of the arrow A, with the head box or
stantaneous pressure difference, it has been suggested to 60 flow box and certain containers below said suction roll
arrange a plurality of suction boxes, partially with differ
omitted.
ent pressures, one behind the other in the direction of ro
FIG. 6 illustrates a wire arrangement over the said suc
tion roll according to the present invention, said suction
roll being designed as wire suction roll.
ever, requires specially designed pumps which complicate 65
General Arrangement
the entire apparatus.
tation of the suction roll in order in this way to obtain a
stepwise pressure course. Such an arrangement, how
In order to overcome the above mentioned drawbacks
and to obtain a quick and safe withdrawal of 'water from
a iiber suspension with a suction roll preferably employed
the paper sheet and is offset in the direction of movement 70 ‘as breast roll or wire suction roll, according to Ithe present
invention the Álow pressure or sub-atmospheric pressure is
of said sheet with regard to the breast roll in such a way
produced in such a way that it will have a continuous
that a converging passage will be formed between the two
It has furthermore been suggested to combine a breast
roll-not designed as suction roll-of a paper making
machine with a further imperforate roll which rests upon
3,091,563
3
4
course along an axis parallel surface line or generatrix
of the roll and that the said low pressure or sub-atmos
pheric pressure will change in the direction of rotation of
the roll along a continuous curve the initial portion of
roll will prior to the entry into the sheet forming zone be
filled with liquid as far as possible.
The discharge of the waste water is effected by slots
in the cover while, in conformity with the location of the
which preferably has the shape of a sine curve.
wire ‘and in conformity with the Wire drive, `at least one
This
combination according to the present invention of a low
pressure which is constant over the width of the sheet
or web with the feature that the `low pressure varies in
the direction of movement of the sheet according to a
steady curve, brings about above all a uniform and careful
-sheet formation as well las a good -felting of the fibers.
The uniform lsheet 4formation is obtained by the uniform
local pressure distribution over the width of the sheet
which pressure distribution maintains everywhere the
same hydrodynamic conditions and thus `assures a locally
uniformly high withdrawal of water. Due to the fact
that the low pressure varies in the direction of movement
of the sheet along a steady curve land not by steps, also
.the withdrawal of water from the fiber suspension and the
formed sheet will be steady so that the fibers will have the 20
possibility to deposit relatively -slowly on the wire or
upon the -already formed sheet and `well to felt with each
other after they have been deposited. By distributing the
slot is provided within the loop of the wire when the
looping angle is small and the wire is driven through the
intervention of a wire deviating roll.
When »a relatively
great looping angle is involved and the wire is driven
through the intervention of the suction roll, at Áleast one
discharge slot is provided in the cover portion within the
loop of the wire and at least another discharge slot is
arranged in said cover outside the loop of the wire.
In the last mentioned instance, the slots are so designed
tha-t the major portion of the waste water is passed through
the slot arranged in the cover portion inside the loop of
the wire, whereas the remaining portion of the waste water
is discharged through the slot outside the loop of the wire.
The width of the sl'ots is adjustable for controlling the high
pressure in the lower part of the crescent-shaped chamber.
Structural Arrangement
Referring now to the drawings in detail and FIGS. 1
and 2 thereof in particular, the apparatus shown therein
deposit over .a longer distance, it is Ialso possible to with
draw a greater yquantity of water from the suspension so 25 com-prises la head box or flow box 1 containing the über
that quite »a number of the table rolls normally following
the breast roll, `and possi-bly also suction boxes will be
saved. The very fine stock in the suspension will, with
the water withdrawal laccording to the invention due to
the relatively slowly effected deposit of the fibers, be 30
maintained to a great extent even with an ample quantity
suspension or stock from which the respective paper sheet,
carton sheet or thelike is to be formed. As will be evi
dent from FIG. '1, the stock or ñber suspension passes
yfrom head box ä1 through a discharge nozzle 3 upon a wire
4. The end wall 2 of the head box 1 and the discharge
nozzle 3 may in a manner known per se (not shown in the
drawings) be displaced and adjusted. As will be evident
of water being withdrawn.
from FIG. 1, wire 4 is passed over a great looping angle
in conformity with a speci-al design of the apparatus ac
partially over the suction roll 5 which latter is provided
cording to the invention, the low pressure or sub-atmos
pheric pressure is produced in the suction roll itself. In 35 over its entire circumference with small bores 11, said
suction roll 5 being designed as a hollow cylinder. This
this way, >it -is not necessary to produce a low pressure or
.hollow cylinder 'has its ends or sides closed by means of
sub-atmospheric pressure by means of a suction pump
end walls 12 as will be evident from FIG. 2. Suction-roll
placed outside the suction roll. Consequently, also lateral
S is, over the major portion of its circumference namely
pipe connections lfrom the pump to the suction rolls as
they have heretofore been required will not be necessary. 40 seen from point 7 in the direction of rotation 13 up to
point 10 with short interruptions at 8 and 9, sealed against
According to a further development of the invention, a
the entrance of air. This sealing is effected by means of
suction roll in form of a hollow cylinder provided with
small bores distributed over the entire circumference of
-a multi-part mantle or housing 20».
said -cylinder is employed in which, for purposes of pro
ducing sub-atmospheric or low pressure, there is rotatably
journalled an eccentrically arranged roll likewise designed
as hollow but substantially imperforate cylinder. This
Within suction roll 5 and eccentrically with regard there
to there is provided an eccentric roll 6 which is rotatably
journalled in suction roll 5. The eccentric roll 6 is pro
llast mentioned hollow cylinder -is so arranged that its sur
face contacts the inner surface of the suction lroll mantle
and, more specifically, that side thereof which faces the
within the suction roll 5 in such .a way that eccentric roll
6 contacts suction roll 5 with liquid friction »at that side
which faces the head box 1. In this way, there will be
formed a crescent-shaped chamber `15 within the suction
roll 5.
When suction roll 5 rotates, »also eccentric roll 6 will
draining zone.
In conformity with a further development yof the inven
tion, for purposes of adjusting the maximum low pressure
or sub-'atmospheric pressure with a similar occurs of the
pressure in the direction of movement of the sheet, the
eccentric roll may be driven at an angular velocity which
deviates from that of the suction roll and is adjustable.
Advantageously, to this end, the eccentric roll is driven
‘by a speed variable motor.
vided with a smooth and closed surface and is mounted
rotate in the same direction ‘14 as suction roll ‘5 either with
the same angular velocity as suction roll S or with a
different angular velocity. When rotating the eccentric
roll 6, corresponding to the same hydraulic laws governing
the table roll ñow, a low pressure or sub-atmospheric pres
sure will subsist in the crescent-shaped chamber v15 which
pressure will change continually in the direction of move
According to the present invention, the outer periphery
of the suction roll and the end faces thereof are to a great 60 ment 21 of the sheet being formed. The said low pressure
or sub-atmospheric pressure will at point 10 correspond
extent covered by la cover arranged .at a slight distance
substantially to the pressure of the flowin the nozzle 3
from the surface of the suction roll with the exception of
and will reach atmospheric pressure, following a maximum
the web or sheet forming zone, the two openings at the
low or sub-atmospheric pressure at about point 7. Be
end faces for passing the bearing studs of the eccentric
roll therethrough, and of the opening for the discharge
tween point 7 and point 8, a gradual increase in pressure
of the waste water -and possibly »also with the exception of
the opening for the passage of the wire into the space be
in the direction of rotation 113 of suction roll 5 will occur
as -a result of which the major portion of the water will
tween the suction roll vand said cover. The purpose of
said cover consists in preventing the air from entering the
be discharged at 8 and the minor portion of the water
twill be discharged at 9.
The water will flow into the con
suction roll, especially behind the sheet forming zone. 70 tainers >16, `1’7 from where it is discharged throughconduits
The `said cover furthermore has the -task to assure that the
Waste water will Ibe able to escape only through slots pro
vided in the high pressure range of the suction roll along
two axis parallel cylinder lines. A further purpose of
18 and 19. The discharge opening l9 serves as water seal
against the entrance of air into the suction roll 5 between
point-s 9 and 10.
As will ybe evident from FIG. 5, the discharge openings
said cover consists in assuring that the bores of the suction 75 8 and 9 are designed as slots extending over the entire
3,091,563
6
5
length of the cover 20. The discharge width of said
slots may be adjusted by means of adjustable slides 22 and
23 (see FIG. 1).
vention is, by no means, limited to the particular con
struction shown in the drawings but also comprises any
modifications within the scope of the appended claims.
As will be clear from FIG. 2, suction roll 5 is, by means
Thus, the employment of breast rolls as suction rolls i-n
of anti-friction bearings 29, rotatably journalled in hollow
studs 28 protruding yfrom the end face ‘12 `of the suction
conformity with the preceding description of the present
invention with self-producing low pressure or sub-at
roll. Rotatably supported by anti-friction bearings 29
mospheric pressure is correspondingly also possible for
suction couch rolls or other suction rolls. The inven
are hollow studs y3K1 journalled in frame 30. The drive of
tion is also I'applicable to cylinder paper machines.
suction roll 5 is effected by a motor 24 through the inter
vention of a gear transmission 25, ‘26. Gear 25 is con 10
What I claim is:
nected to a shaft 27 of a motor 24, whereas gear 26 is
connected to one 4of the hollow studs 28.
l. In the method tof withdrawing large quantities of
liquid from a dilute suspension, especially fiber suspen
The eccentric roll 6 `arranged in hollow suction roll 5
sion, for producing a fiber web in a web-forming zone of
a foraminous or perforated hollow cylinder, the steps of:
is rotatably supported by frame 30 through the interven
tion of hollow studs 31 -and extensions 32 thereof which
delivering the suspension to said web-forming zone on
latter have journalled therein studs 33` connected to the
the outside of the cylinder, -creating a reduced pressure
end »walls 38 of eccentric roll 6. Eccentric roll 6 is driven
on the inside of said cylinder in said web-forming zone,
by means of a variable speed motor 34 through la belt
varying said reduced pressure from .a minimum to a maxi
drive 3S, shaft 36, gear 3,7 and ya gear ring 39 which is
mum continuously and steadily and in the direction of
provided with inner teeth and is connected to the 'adjacent 20 movement of the web being formed while maintaining
end wal-l 38 of the eccentric roll 6.
said reduced pressure constant at any line extending across
FIG. 3 illustrates a drive of the eccentric roll 6 by means
the width of said web being formed, exerting said re
of a change gear transmission 40 and a constant speed
duced pressure on said `suspension over said web-forming
moto-r 41.
zone to withdraw liquid from the `suspension into said
In order to adjust the suction zone in the direction of 25 cylinder, and discharging the drained-off liquid from the
movement of the sheet being formed, in conformity with a
inside of said cylinder through the perforations thereof
further development of the present invention, the imper
:and across the entire width thereof.
forate surfaced eccentric roll 6 placed within the suction
2. I-n the method of withdrawing large quantities of
roll 5 is movable bodily -about the central axis of the suc
liquid from ya dilute suspension, especially fiber suspen
tion roll 5 (FIG. 4). To this end, the bearing stud 3.1 is
sion, for producing a fiber web in `a web-forming zone
rotatably journalled in frame 30 and can be rotated
by means of a perforated suction roll and a wire passing
through the -intervention `of a worm wheel drive 43V in con
formity with the desired adjustment of the suction zone.
Such an arrangement makes it possible to adapt the suc
tion zone to the head box the flow conditions of which at
the entry into the sheet forming zone can never be fully
judged in advance.
With the heretofore described embodiments of an ap
paratus according to the present invention, the wire 4
passes over suction roll 5 over la large looping angle, and
the drive of wire 4 is effected by means of the suction roll
y5 itself. As will be evident from FIG. l, the discharge
slot 8 of cover 20 for the discharge of the major portion
of the waste water is arranged within the l-oop of wire 4,
over said `suction roll in >close contact therewith along at
least said web-forming zone, the steps of: delivering the
suspenion to the unit in the weh-forming zone, creating
`a reduced pressure on the inside of said suction roll in
the web-forming zone, varying said reduced pressure from
zero to a maximum continuously and `steadily and in the
tdirection of movement of the web being formed while
maintaining said reduced pressure constant at any line
extending across the width of said web being formed,
«exerting said reduced pressure radially through said roll
and wire on said suspension lover said web-forming zone
to withdraw liquid .from the suspension into said suction
roll, and discharging the drained-off liquid from the in
whereas slot 9 for the remainder to be discharged is ar 45 side of ysaid suction roll through the perforatio-ns thereof
ranged outside the loop of wire `4.
and `across the entire width thereof.
In contrast thereto, with the «arrangement of lFIG. 6,
wire l4 passes over a short peripheral portion of a suction
roll 50, i.e. has ia smal-l looping angle, and the drive of
the wire is effected by means of a wire return roll 44.
The
discharge of the waste water in this embodiment is effected
through one slot 45 only which is arranged in the cover 46
within `the loop of wire 4.
While .the eccentrically supported inner roll 6 has been
illustrated and described as imperforate, it will be under
stood that it is not absolutely essential for this roll to
be compeltely without perforations. A completely im
perfor-ate roll in this location produces the best results,
3. In `a web forming machine, especially paper web
forming machine: a rotatable perforated Jhollow suction
-r-oll, a draining zone having a relatively short portion
thereof arranged adjacent said suction roll, `and a substan~
tially imperforate eccentric roll rotatably located within
said suction roll and eccentrically arranged with regard
thereto and extending axially over -the entire length of
the perforated portion of said suction roll, said eccentric
roll having »a rotating peripheral surface portion in line
contact with the inner surface of said suction roll at a
portion thereof which is adjacent the beginning point of
said relatively short portion of said «draining zone while
the respective remaining peripheral router surface of said
eccentric roll and the respective inner suction roll sur
60
would effect substantially the same results .although with
face facing said respective remaining peripheral 4outer sur
somewhat reduced efliciency. The reduced eñiciency
face of said eccentric roll confine with each other a cres
would come about because the perforated roll with the
cent-shaped gap.
inner chamber thereof would fill with liquid and at least
4. A web forming machine according to claim 3, in
a portion would pass therefrom and interfere with the re
which said eccentric roll forms a hollow cylinder.
duction of pressure in the crescent -shaped chamber zone
5. A web forming machine `accor-ding to claim 3, which
between the inner and outer rolls.
includes means for varying the angular velocity of said
It will yaccordingly be understood that where the term
eccentric roll.
“substantially imperforate” is employed in the claims,
6. In a web forming machine, especially paper web
this i-s intended to mean a -roll having -no perforati-ons or
forming machine: a rotatable perforated hollow suction
roll, `a draining zone having a lrelatively short portion
perforations in a small enough number or of such small
thereof arranged adjacent said suction roll, a substan
size that the intended effect of the present invention is
tially imperforate eccentric roll rotatably located within
realized, namely, the controlled pressure variation about
said suction roll and eccentrically larranged with regard
the crescent `shaped region between the rolls.
It is, tof course, to be understood that the present in 75 `thereto and extending axially over the entire length of
but it will be apparent that a ro-ll with a few perforations
therein, or a yroll with many extremely small perforations,
3,091,563
'S
`the perforated portion of said suction roll, sai-d eccentric
Aroll having a rotating peripheral surface portion in line
arranged with regard thereto and extending axially over
the `entire length -of the perforated portion of said suc
`contact with the inner surface of said suction roll at a
tion roll, said eccentric roll having a rotating peripheral
portion -thereof which is adjacent the beginning point of
surface portion in line contact with the inner surface 'of
said relatively short portion of said draining zone while
the respective remaining peripheral outer surface of said
eccentric roll -and the respective inner suction roll sur
said suction roll -at a portion of the latter which is ad
jacent the beginning point of said relatively short por
face facing _said respective remaining peripheral outer
peripheral outer surface of said eccentric roll and the re
tion of said `draining zone while the respective remaining
surface of said eccentric roll confine with each other a
crescent-shaped gap, and a variable lspeed motor driv
' ingly connected to said eccentric roll for driving the same
spective inner suction roll surface facing said respective
remaining peripheral outer surface of said eccentric roll
at variable speed.
7. In a web-forming machine, especially paper web
means slightly spaced from and extending along a major
forming machine: a rotatable perforated hollow suction
roll, a draining Zone having a relatively short portion
thereof arranged adjacent said suction roll, a substan
¿tially >imperforate eccentric roll rotatably located Within
said suction roll and eccent-r-ically arranged with regard
thereto and extending axially over the entire length of the
perforated portion of said suction roll, Said eccentric
roll having a rotating peripheral surface portion in line
confine with each other a crescent-.shaped gap, and »cover
portion of the outer surface of said suction roll while com
prising at least one discharge slot for discharging waste
water from the inside of said cover means, said discharge
slot being arranged in the cover means at a point inside
said wire means.
12. ‘In a web forming machine, especially paper web
forming machine: a rotatable _perforated hollow suction
20 roll, wire means passing over a relatively large portion
of said suction roll and rotatable by the latter, means driv
ingly connected to said suction roll for rotating the same,
contact with the inner surface of said suction roll at -a
a draining zone having a relatively short portion thereof
portion thereof which is adjacent the starting point of
arranged adjacent said suction roll for forming a web
Isaid relatively short portion ‘of said draining zone while
upon a portion of said wire means, a substantially irnper
the respective remaining peripheral outer surface of said
forate eccentric roll rotatably located within said suc
eccentric roll and the respective inner suction roll surface
tion -roll and eccentrically arranged with regard thereto
facing said respective remaining peripheral outer surface
and extending axially `over the entire length of the per
of said eccentric roll confine with each other a crescent
forated portion of said suction roll, said eccentric roll
shaped gap, and means operatively connected to said ec
-centric roll for adjusting the `same in a complete circle 30 having a rotating peripheral surface portion in l-ine con
tact with the inner surface of said suction roll at a por
around the central axis of said suction roll while main
tion of the latter which is adjacent the beginning point 0f
taining said line contact with the inner surface of -said
said relatively short portion of said draining zone While the
suction roll.v
respective remaining peripheral outer surface of said ec
8. -A web yforming machine according to claim 7 in
which the said means for -adjusting the eccentric rollcom 35 centric roll and the respective inner suction roll surface
facing said respective remaining peripheral outer surface
prises a worm wheel connected with said eccentric roll,
and a Worm gear meshing with said worm wheel rotatable
of said eccentric roll confine with each other a crescent
shaped gap, and cover means slightly spaced from and ex
for rotating said worm wheel for eifecting'the said bodily
tending along an outer sur-face portion of said suction
adjustment of said eccentric roll.
9. In a web forming machine, especially paper web 40 roll while leaving a passage between the latter and said
relatively short portion of said draining zone for passing
forming machine: a rotatable perforated hollow suction
roll, wire means passing over a portion of said suction
roll, a »draining zone having a relatively short portion
thereof arranged adjacent said suction roll for forming
said wire means therethrough, said cover means includ
ing at least one main discharging slot for discharging the
major portion of the water withdrawn through said suc
a web upon atportion of said Wire means, a substantially 45 ' tion roll and also including at least one auxiliary slot for
imperforate eccentric roll rotatably located within said
suction roll and eccentrically arranged with regard thereto
and extending axially over the entire length of the perfo
rated portion rof said suction roll, said eccentric roll hav
ing a'rotating peripheral surface portion in line contact
with the inner surface of said suction roll at .a portion
of the latter which is adjacent the beginning point of said
relatively short portion of said draining zone while the
respective remaining peripheral outer surface of said
»eccentric roll and the respective inner suction roll sur
face facing said respective »remaining peripheral outer sur
face of said eccentric roll coníine with each other a cres
discharging the remainder of the water withdrawn through
said suction roll, said‘main slot being arranged in that por
tion «of said cover means which is arranged inside said
wire means, and said auxiliary slot being arranged in Vthat
portion of said cover means which is arranged outsideI
said wire means.
13. yIn a web forming machine, especially paper web
forming machine: a rotatable perforated -hollow suction
roll, wire means passing over a portion of said suction
roll, a draining zone having a relatively short .portion
thereof arranged adjacent said suction roll for forming ¿a
web upon a portion of said wire means, a substantially
imperforate eccentric roll rotatably located within said
suction roll and eccentrically arranged withregard there
to and extending axially over the entire length of the per
60
suction roll while permitting the discharge of water With
forated portion of -said suction roll, said Veccentric roll
drawn through said suction troll and also permitting the
having a rotating peripheral surface portion in line con
passage Yof the respective >wire portions between said
tact with the inner surface of said suction roll at a portion
suction roll and said draining zone.
of the latter which is `adjacent the beginning point of said
10. A web forming machine according to claim 9, in
relatively short portion _of said drainingzone while the
which said cover means includes discharge slots extend 65 respective remaining pelipheral outer surface of said
ing at -least over the width of the web being formed.
eccentric roll and the respective inner suction `roll sur
1l. In -a web forming machine, especially paper web
face of said eccentric roll confine with each yother a cres
»forming machine: a rotatable perforated hollow suction
cent-shaped gap, and cover means slightly spaced from
the outer surface-of said suction roll and surrounding said
cent-shaped gap, and cover means slightly spaced from
roll, wire means passing over a relatively short portion
of said suction roll, means drivingly connected to said 70 the outer surface of said suction roll and surrounding said
suction roll while permitting the passage of the respec
wire means for driving the same, a draining zone having
tive wire portions between said suction roll and said rela
`a relatively short portion thereof arranged adjacent said
tively short portion of said draining Zone, said cover
suction roll for forming a web upon a portion of said
means including adjustable slot means for discharging
vwire means, a substantially imperfo-rate eccentric roll ro
water from the interior of `said suction roll.
Statably located `within Vsaid suction roll andeccentrically
3,091,563
l@
14. In a paper machine, in combination, a rotatably
mounted foraminous cylinder, `an inlet adjacent said cylin
der arranged for feeding stock to the 11p-running side of
the cylinder for depositing a fibrous web thereon, iirst seal
defining a tapered gap with Ithe inner periphery of said
cylinder.
16. |In a paper machine, in combination, a looped form
ing Wire, a rotatably mounted foraminons cylinder Within
ing means for the cylinder in the region of lthe bottom of Ul the loop of the Wire, an inlet adjacent the cylinder ar
ranged for feeding stock to the Wire on the A11p-running side
the inlet, second sealing means for the cylinder beginning
of the cylinder for depositing a fibrous web thereon,
means arranged within the cylinder and creating suction
Within the cylinder, said suction crea-ting means consisting
the cylinder and operable `for ere-ating suction Within the
cylinder between said first and second sealing means, said 10 of a substantially impe-rforate roll eccentrically arranged
-so as to form` a tapered gap With `the inner periphery of
suction creating means consisting of a substantially im
said cylinder, and mounting means adjustably connected
perforate lroll eccentrically rotatably arranged Within and
to said roll for selectively bodily ~rotating the same about
in close running relation to the inner periphery of said
the central axis of said cylinder.
cylinder.
at the top of the cylinder and extending in the direction
of rotation of the cylinder, and means arranged Within
15. In a paper machine, in combination, a looped form
References Cited in the iile of this patent
ing Wire, a rotatably mounted foraminous cylinder Within
the loop of the wire, an inlet adjacent the cylinder ar
UNITED STATES PATENTS
ranged for feeding stock to the Wire on the up-running side
550,353
Parker _______________ __ Nov. 26,
of the cylinder for depositing a iibrous web thereon,
1,864,580
Brawn _______________ __ lune 28,
means arranged Within the cylinder and creating suction 20 2,348,340
Goodwillie et al. _______ __ May 9,
Within the cylinder, Isaid suction creating means consist
2,353,991
Vickery ______________ __ July 4,
ing of a substantially imperforate roll eccentrically ro
2,694,345
Hornbostel __________ .__ Nov. 16,
tatably arranged in close running relation to the inner
-2,943,678
Fasoli _______________ __ July 5,
periphery of said cylinder and controlling the rlloW of water
Han etal _____________ __ Jan. 30,
from the stock through said foraminous cylinder, said roll 25 3,018,825
1895
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1962
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