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Патент USA US2073410

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March 9, 1937.
« E_ B, THOMAS
ABsoRBENT PACKAGE 0R PAD
Original Filed Deo. 26, 1925
I
2,073,410
Patented Mar. 9, 1937
2,013,410 I
>P'A'rlazN'l‘ ori-*ics
>UNITED STATES
2,073,410
~
ABSOBBENT PACKAGE 0B PAD
`
Errol'd B. Thomas, Newton,- Mass., asslgnor to
International Cellucotton Products (Jompany,~
. Chicago, Ill., a corporation of Delaware
Reñled for abandoned application Serial No.
77,786, >December 26,'1925. This applicatlo
octqber s, 1934, serial No. 141,594
.
sclai'ms. ' (ci. 12s-29o)
Fig. 6 is a view similar to Fig. 5 showing a fur
My invention relates to packages orv pads of
absorbent material, of general use for absorptive
purposes but particularly adapted for use in sani
tary napkins. More particularly my invention
ther modification of absorption controlling means
embodying my invention.
-
Referring now more particularly to the draw
5 aims to provide an improved and less expensive
.material and article of the class described, in
cluding means for controlling or _directing its
absorptive action. This application is a re-iiling,
with identical disclosure of the means ofl my in
10 ventio'n, of my previous application S. N. 77,786,
filed December 26, 1925.
It has heretofore been proposed to employ in
forming absorptive pads a relatively large plu
rality of layers er webs of extremely tenuous and
`l5 film-like wood cellulose material, generally some
thirty-five to forty of >such webs being super
posed. -Said webs are each separately formed,
and because of their extreme thinness require
slow and careful handling during the process >of
20 manufacture and in forming the pads. They can
ing, I have shown at the left in Fig. 1 a web or ~ 5
layer I of the wood cellulose material as it comes
from the drums and rollers of the web-formingV
machinery. At that ktime the web has substan
tially the consistency, form, and surface char
acteristics of ordinary blotting paper, and is pref- .10
erably of about the thickness of that product. It
may be formed by means of the usual machinery
employed in producing blotting paper and the
like, without necessitating any rearrangement or
costly change in such machinery, thus making it- l5
possible to use the same machines and to shift ’
readily from the manufacture of the present
product to `another without additional expense.
'I‘he cellulosic material of which said webs are
formed is preferably wood cellulose of the> so- 2o
called "alpha fibre” type, >consisting of a soft
wood pulp, such as pine, from which practically
- not be run rapidly through the rollers, drums and
the like necessarily employed in the production
of the same. The expense of manufacture is fur
ther increased by the fact that special machinery
as or special and costly adaptation of the usual pulp.
handling machinery is required.
all traces of pitch and tar have been removed. f
So far as I am aware webs of wood cellulose of
said form and character have not heretofore been 25
employed or suggested for use in connection with
absorptive packages for sanitary napkins or the
like, and in the form so far described are wholly
unsuited for such use because of their stiffness,
For the purpose of decreasingmanufacturing
costs, and at the same time providing an im
_proved product, Qin accordance with my present
30 .
80 invention, I employ a less number of layers or harshness, surface matting of the ilbres, etc.
As lillustrated in Fig. 1, the webs in their stiff,
webs of wood cellulose which, while thin as com
pared with the thickness of the absorbent pad as libre-matted condition in which they come from
a who1e,.have suillcient substance and are of such the web-forming machinery, as indicated at l,_'
consistency as- to be susceptible loiî rapid handling are subjected to a softening,'fluiïing, napping,
ß and by machinery of the standard form generally crumpling,- >or other like action spreading and 35-
used in
manufacturing from wood pulp. - separating the fibers, on both faces of the web.
In the drawing illustrating embodiments of 'I'he means herein shown by way of example for
effecting said operation comprises the upper and
certain _forms of my inventionz-v
» .
'
Fig. I is a vertical section showing a layer or lower rolls 2. 3 rotatably supported in position
to permit passage of the web between them, 40
‘0 web of the~ cellulose material in the form in which suitable
guides I, 5 for the web being provided.it comes from the web-forming machinery;
Fig. 2 is an expanded view, in perspective, of a
plural-layer absorbent pad embodying one form
of my invention;
-
-
Fig. 3 is a similar view, showing the pad assem
bled, portions of the upper layers being broken
away:
'
,
.
-
.
„
Said rolls have web-engaging surfaces formed of -
coarse sand-paper, radial wires, bristles, teeth. or
the-like, and preferably are driven at slightly
different speeds so as to» subject the webs to a '45
differential or brushing action in additionv to
the picking, napping,- ñuiiing or like softening
and surface-matting destroying action.
' .
_
Fig.> 4 is a corresponding 'view showing a pad
By said means the web 6 issuing from the de
5o with modified form of absorption controlling~ livery guides 5 is rendered extremely soft and 50
pliable, having both faces ?uned and relieved of
means;
.
Fig. 5 is a perspective view of layers of absorp- ’ >.surface matting of the abres. Both m appear
tive material illustrating another arrangement ' ance and to the touch the webs vthus treated so _*
of absorption controlling or directing means in
3g accordance with my invention; and
closely resemble natural short-staple absorbent
cotton as to -be scarcely- distinguishable from it. .55
2
`
_
2,073,410
I thus provide a material in web or sheet form
which is admirably suited for use in absorbent
packages, being clean, highly absorbent, and in
expensive in `manufacture. An `eiiicient absorp
5 tive package may be formed from about seven
layers or webs superposed and cut to the desired
size, as illustrated; obviously a.- greater or a
less number of such layers may be employed if
desired.
10 In- a package or pad formed ofthe materialas described the natural absorptive vaction is
substantially the same in all directions in the
plane of the web, and is .somewhat- greater'in
that plane than in the direction through the pad.
_ 15 For vsome purposes this is wholly desirable, but in
1 a pad for use in a sanitary napkin an objec
tion arises which, unless remedied, would tend
to outweigh the numerous advantages already
substantially so, but will be forced to spread in
the direction of the slits and downwardly through
fthe web and into the next lower web or webs.
Preferably the number and arrangement of the
slits are such that the resultant absorption will 5
be distributed evenly over the entire available
area, that is, the area which it is permissible or
desirable to employ. The .proper longitudinal
distribution will )have taken place in substan
tially the same time as the less extensive and re- 10
tarded lateral distribution, while the down-ab
sorption simultaneously is materially increased
and more evenly distributed.
«
In Figs. 2 and 3 I have illustrated four slits in
the upper or ñrst web, which, being the first` to 15
receive the iiuids, requires the greatest direction
or control of its absorptive action.
The number '
of slits may be ~increased or decreased according
mentioned. A
to different conditions. Also in the succeeding
20 In a sanitary napkin the absorbent pad is' layers or webs the number of slits may be progres- 20
somewhat elongated, having a length preferably sively decreased or otherwise varied toward the
from two to three times the width of the pad. - bottom of the pad. By way of example, in said
Equal rate of absorption in all directions in the Figs. 2 and 3, I have shown three slits in the
plane of the webs is advantageous, even in this
25 case upto a certain point, since a greater lateral
extent of the pad is brought into use, as com
pared for example with elongated .pads formed
web. It‘will be understood that the number of
of a greater number of extremely thin webs, pre
layers or webs may also be varied.
viously referred to, having a longitudinal grain
If a less increaseof the downward absorptivev
action is desired, the slits’in succeeding webs may 30
30 resulting from necessary craping or the like and
in which the absorption is much' greater longitu-‘
dinally of the pad and too limited in the lateral
direction.
.
'
ì
' But this‘advantage extends only to a certain
'35 point, namely, where the maximum desired lat
eral spread is reached. Beyond that* point the
ability of the pad to absorb equally rapidly in all
directions in the plane of the webs becomes a dis
advantage in an elongated pad, since the ñuid
40 may spread by absorption to the outer side edges
‘
second web, two in the third, three in the fourth.
two in the ñfth, and one in the sixth or next to 26
the bottom web, and none in the last or bottom
of the pad, with undesirable results, before the
desired longitudinal extent -of the pad'has come
into action.
’ My invention therefore includes a method and
45 means for controlling- or directing the absorp
tive action, and whereby the absorption may be
made to take place laterally of the pad to the
^
be diiferently spaced apart, staggered or other- '
wise arranged so as not to come one directly
beneath or above another, as in said Figs. 2 and
3; or if a greater down absorption and somewhat
,
less limited lateral absorption is desirable )an 35
arrangement similar to that of- Fig. 4 maybe '
employed, wherein I have shown four slits in
each of the first two webs, and in coinciding posi
tions, two slits in each of the two succeeding A
webs, also in coinciding position but diifering 40
from the position of the slits in the iirst webs,
the remaining webs being unslitted. 'I‘he ar
rangement and number of slits, and the number
of webs slitted, may thus be widely varied in ac-I
cordance with the circumstances and with the 45
results desired.
.
.
~
In some instances it has been found useful to
desired extent but not beyond, and also at a _ arrange the slits somewhat on the bias, as shown
in Fig. 5, the slits 1 being inclined at any desired
- 50 the pad and over the entire available area ofthe angle to the longitudinal axis of the pad, and in 50'
greater rate downwardly in the direction through
pad rather than locally only.
For this purpose, as clearly seen in Figs. 2 and
3, one or more of the webs, starting at the upper
face of the pad, are provided with one or more
55 cuts, slits, or like formations 'Lrdesirably sub
stantially parallel when a plurality is employed,
and extending in a direction approximately per
pendicular to that direction in the plane of the
` web in which it is desired to decrease the ab
w sorptive eiliciency. Said - cuts or .slits prefer
ably are each substantially continuous, as in
Figs. 2 and 3,'- and in Fig. 6, in which- latter each
such formation comprises a series of shorter'cuts
-or slits 'I'. Each such formation has an overall
length approximately. that of the area over
which absorption is desired, but not exceeding
such length. Desirably they terminate’ sum
ciently >short of the end edges to preserve the
structural strength oi the pad.«
70
-
By means of' said slit-like formations the -lat
eral absorption in the slitted web is impeded or
wholly checked. The absorptive action is di-'
rected and controlled since the ñuid will not
readily ,cross from one slit edge to the opposite
75 one, `even though slitted edges are in contact or
l
either direction, preferably not exceeding 45°, so
'that their general direction remains lengthwise
the pad.
_
Y
As above pointed out the described method an
structure result'not only in properly limiting the 55
lateral absorption 'but also in increasingthe down
absorption, which latter is made to occur not
locally merely but over the entire available area
of the pad. Any possible leakage at the bottom
of the pad is desirably prevented by suitable 60
moisture-proofing means l, preferably such as
disclosed in my Patent No. 1,564,498, dated De
cember 8, 1925, and thev Reissue No. 16,603
' thereof.
My invention is not limited to the particular c5
embodiments thereof shown and described by way
of illustration, its scope being set forth in the
appended claims.
I claim:
‘
1. An absorbent pad particularly adapted for 70
use in a sanitary napkin, comprising a plurality
of superposed webs of cellulose material rela
tively thick as compared with a tenuous iilm and
wherein the absorptive rate is normally ,substan-i .
tiallyequal inalldirectionsintheplaneofaweb, 75
3
2,078,410 '
certain of saidwebs having one or more substan
tially continuous slit-like formations extending
in a general direction approximately at right
angles to the direction in which it is-A desired to
' limit the rate of absorption, and of a length less
than the dimension of the pad in the direction
of'their extent, each web so formed having a
peripherally continuous and non-slitted marginal
tion in _the pad to` be elongated longitudinally
o! the pad from a localized area of ñuid applica
tion disposed more or less centrally of the pad.
3. ¿in absorbent pad particularly adapted for
use in a sanitary napkin, comprising a generally
elongated, flattened pad of absorbent cellulosic
material, lthe pad being formed of a plurality of
relatively superposed sheets of said material, said
pad having a: web of sheet material disposed inf
portion integrally enclosing the same.
2. An absorbent pad particularly adapted for - termediate its thickness and providedwith la ¿slit-i
use in a sanitary napkin, comprising a generally like iormation extending generally longitudinally
elongated. ñattened pad oi absorbent cellulosic
material, the pad _being formed of a plurality of
relatively superposed sheets of said material and
l5 .being provided with a slit-like formation extend
>
ing generally longitudinally of the pad, said alit
v like formation serving to cause the area of absorp
o! the pad, said slit-like formation serving to
cause the area of absorption in the pad to be
elongated longitudinally of the pad from a local
ized area of iluid- applicationl disposed more or 15
less centrally ofthe pad.
'
._
«
«
vERROLD B. THOMAS; ,
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