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Патент USA US2407640

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F. GILBERT, .JR _
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CONTAINER AND METHOD oF MAKING SAME>
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Filed May 4, 1942
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INVENTOIR
FRANK GILBERT, Je.
El? el.
ATTORNEYS
Patented Sept. 17, 1946
2,407,639
AUNITED STATES ?- PATENT OFFICE
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2,407,639
CONTAINER AND METHOD OF MAKING
SAME
Frank Gilbert, Jr., Olmsted Falls, Ohio
Application May 4, 1942, Serial No. 441,649
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s claims.
(C1. .9s-s6)
This invention relates to animprovement in
containers and methods of making said contain
ers. More particularly, this invention relates to
a method of rendering containers of fibrous sheet
provide a bottom closure for the tube II. The
tube I I is closed with a top cap I4 similar :in con
struction to the bottom closure of the tube II.
material exceptionally rigid, liquid-proof and
prised of a spirally Wound tube 2| closed at one
end with a bottom closure cap 23 of stamped
paper and at the other end `With‘a top closure
cap 24 of stamped paper. The bottom cap 23 is
provided with a suitable spacer 25 and the tube
20 represents an inner shell or container com
impervious to most common gases and vapors.
Heretofore, containers of `ñbrous materials,
such as paperboard, chipboard, strawboard, or
like paper stocks, generally have not been satis
factory for packaging heavy materials or mate 10
rials which are likely to lose or absorb moisture.
In the first place, such containers seldom pos
sessed suñicient rigidity unless the wall thick
nesses were increased to unwieldy proportions.`
2| is likewise provided with suitable centering
spacers 26. The outer shell I0 and the inner shell
2u are both preferably comprised entirely of
ñbrous sheet material, such as heavy kraft paper,
chipboard, paperboard, strawboard, or like paper
In the second place, such containers, unless they 15 stock. The outer surfaces of the outer shell Ill
were lined with comparatively expensive im
pervious liners, Were not impervious to gases and
vapors, such as air and moisture vapor. Conse
quently, the general practise has been to employ
may be suitably glazed or lacquered and may
carry any desired printing or label. The inner
surface of the tube 2I and cap 23 may also be
suitably glazed or coated, if desired. As will be
more expensive metal or glass containers when 20 apparent from the following, it is preferable that
the substance to be packaged required a rigid
and impervious container, particularly when it
was desirable to maintain a vacuum within the
sealed container.
the inner surface of the outer shell I0 and the
outer surface of the inner shell 20 should be
unglazed or, at the most, only slightly glazed or
ñnished in order to allow the shells to be impreg
It is an object of this invention to .provide an 25 nated with the filler. Also, it is preferable that
inexpensive container of ñbrous material which
the top cap 24 be made of porous stock carrying
Will be substantially impervious to common
-only a small amount, if any, of sizing or iiller
liquids, gases, and vapors and which will possess
>which tends to render the stock non-porous.
a rigidity and strength approaching that of the`
The closures for the outer shell II) are shown as
well-known metal and glass containers.
30 being of the well-known spun tube and disk con
Another object of this invention is to provide
struction and the closures for the inner shell 2|]l
-a ñbrous container and a method of sealing
" are shown to be stamped paper caps, in order
which will permit a vacuum to be created and
to illustrate twotypes of closures, each of which
maintained within the container.
may be used for both shells. Obviously, other
It is also an object of this invention to provide
types of end-closures may be used for the shells
a double-wall container having a hermetically
where such other types of closures would be con
sealed space between the walls of the container.
venient and practical.
Other and further objects and advantages of
The several spacers 25 and 26 are preferably
this invention will be apparent from the follow
embossed or deeply scored projections on the
ing speciiication, claims, and drawing, in which: 40 inner shell 20. Such spacers, however, may also
Fig. 1 is a cross-section of an outer shell and
_be made by attaching strips or spots of paper
an elevation of an inner shell showing a manner
stock, or non-porous material, such as sealing
of assembling acontainer made according to my
wax, to the outer surfaces of the inner shell 20.
invention.
>
It is also apparent that the same function of
Fig. 2 is a cross-section taken along the line 45 centering and spacing the inner shell Zû in the
2_2 of Fig. 1 showing one form of an assembled
outer shell III would be served by similar spacers
container made according to my invention.
_on the inner surface of the outer shell I0.
Fig. 3 is a view similar to Fig. 2 showing an
A preferred manner of assembling my con
other form of an assembled container made ac
tainer is shown in Fig. 1. The open outer shell
cording to my invention.
I0 is partly ñlled with a molten filler 3U which
In the drawing, in which like reference charac
is substantially solid at normal atmospheric tem
ters refer to like parts,` I0 represents an outer
peratures. 'I‘he closed inner shell 20, ñlled with
shell or container’ comprised of a spirally wound
the substance to be packaged, 40, is then inserted
tube Il having one end spun in to provide anY ,
vinner flange I2 on which a diskV I3 is seated to
in the outer sneu Io while the nner sa is stm in
a nuid condition. ` As the inner shell 20 is placed
2,407,639
3
within the cuter shell so that it is centered in the
outer shell by the spacers 26 and spaced from the
bottom I3 by the spacer 25, the molten ñller is
extruded up between the walls of the inner and
outer shells, completely filling the space therebe
tween up to the level attained due to its displace
ment by the shell 20. The filler 30 is then allowed
to solidify. The cap I4 may be placed on the
open end of the shell IIJ either after or before the
filler solidifies, depending upon whether a com
pletely filled container, as shown in Fig. 2, or a
hollow wall container, as shown in Fig. 3, is de
sired.
The ñller 3D is preferably a wax, such as paraf
fin, and/or a resin, such as pine rosin, which will
4
applied to maintain the spacer 25 in contact with
the bottom I3 until the filler solidi?ies suñiciently
to prevent the inner shell from floating. If the
filler tends to shrink when cooling, a sufficient
amount of filler should vthen be added to fill the
outer shell before closing it with the cap I4.
The container illustrated in Fig. 3 is provided
with a substantially hollow wall. This construc
tion is obtained by placing a slightly lesser
amount of filler inthe open outer shell Il), in
serting the closed inner shell 20, closing the outer
shell with the cap I4 and then, while the filler is
still molten, inverting the package so that filler
will flow into the space between the cap III and
the inner shell 20. To prevent the inner shell
20 from falling into said space, it is preferable
not only solidify into a rigid mass at atmospheric
to
provide the cap 24 with a spacer 21, .as shown
temperature but which will also penetrate and
in Fig. 3. To prevent the filler from freezing> or
impregnate the walls of the inner and outer shells.
solidifying as the package is inverted, so that flow
A mixture of paramn wax and rosin is often pref-`
erable for the filler 30, since the mixture of the 20 of the filler into the space between the caps 24
and I4 would be prevented, it is particularly de
two cheap constituents of such a filler is less
sirable that the contents of the shell 20 be heated.
brittle than either of the constituents alone. It
is obvious, however, that one may use any other
By repeated inversions of the package as the filler
cools, a hollow wall container, in which both‘the
suitable and normally solid filler, plasticized 'if
necessary, which is substantially impervious to 25 inner surface of the outer shell I0 and the outer
surface of the inner shell 20 are impregnated and
the gases, vapors, or Aliquid which it is desired
hermetically sealed, will be obtained. In most in
either to retain in thè packaged contents 40 or
stances, flns or flutes of filler will extend between
from which the packaged contents are to be pro
the shells, thereby strengthening the walls of the
tected. A mixture of paraffin wax vand pinerosin
g
is usually a satisfactory filler when it is desired 30 package.
From the foregoing, it should be apparent that
to have the package impervious to air, water and
containers made according to this invention may
water-vapor, and 'many petroleum products. How
be modified as to the shape and structure of the
my container prevents leakage of petroleum prod
inner and outer shells, the closures therefor, and
ucts which normally seep or wick through vessels
consisting only of paper stock or only of the filler 35 the composition of the filler as the requirements
of specific packages -will -dictate to those skilled
is not understood.
in the art. It is to be understood, therefore, that
By employing a top cap 24 which is of porous
this invention is not to be considered to be limited
stock, I achieve a vacuum packaging of the con
to the specific embodiments disclosed, either in
tents 40. When the closed inner shell 20 is in
whole or in part, but by the following claims.
serted into the outer shell I0 partly filled with
What is claimed is:
'
the hot molten filler 30, the contents 40 are heated
l. A method of rendering a container of fibrous
and expanded, expelling air and other gases
material substantially impervious and of increas
within the shell 2li through the porosities of the
ing the rigidity of said container comprising the
inner shell 20, and, particularly, through the
steps of placing in an outer shell of fibrous stock
porosities of the cap 24. As the filler 3B, which>
a quantity of liquid filler which is normally sub
surrounds the inner shell 20, cools and solidifies,
stantially solid, inserting an inner shell of fibrous
however, the porosities in the shell 2Il are filled
stock in said outer shell while said filler is liquid
and impregnated by the solidifying filler. _Con
to extrude said filler between the walls of said
sequently, air does not return into the inner shell
shells, and then allowing said filler to solidify.
as the contents of the inner shell (including re
2. A method of rendering a container of fibrous
sidual gases, if any) cool and tend to contract.
_material substantially impervious and of in
Thus, the inner shell is thoroughly sealed and
creasing the rigidity of said container comprising
I at least apartial vacuum is created and main
the steps of partly filling an open outer shell of
tained within the inner shell.
fibrous stock with a molten filler which is nor
It is often preferable and advantageous to have
mally substantially solid at atmospheric tempera
the inner shell 20 and contents 40 heated when
tures, inserting a closed inner shell of fibrous
the inner shell is immersed in the molten filler
stock in said outer shell while said filler is molten
30. The advantages generally obtained are: first,
to extrude said filler between the walls of> said
freezing or solidiñcation of the filler is delayed,
vshells and to impregnate the inner surface of
thereby preventing the formation of voids which
said outer shell and the outer surface of said
extend across the space between lthe shells and
inner shell at least partly with said filler, and
cause portions of the walls of the shells to be
maintaining said inner shell within and spaced
uncoated or unimpregnated by the filler; second,
from said outer shell while said filler is allowed
impregnation of the inner surface of the outer
to cool and solidify.
.
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shell and of the outer surface of the inner shell
3. The method of sealing and creating a vacu
is assisted; third, the vacuum within the inner
um within a container of fibrous stock comprising
shell tends to be increased.
thev steps of ñlling a quantity of moltenfiller,
In the container illustrated in Fig. 2, the filler
which is normally solid and substantially im
30 completely fills the space between the inner
permeable to gases, in ari open outer shell, placing Y
and outer shells. This construction is obtained
a closed inner shell, of which at least a- portion
by placing in the open shell I0 a volume of molten
is comprised of "porous fibrous stock, within said
filler approximately equal to the total volume of
outer shell, the quantity of filler in said outer
space between the shells and the volume of filler
' shell being sufficient to permit ,said inner shell
impregnated in the shells. If Vthe inner shell tends
jto float in the moltenf'iller, pressure should be 75 to be submerged in said filler- andthe fibrous
5
2,407,639
6
stock of said inner shell being suiiiciently porous
to permit gases enclosed in said inner shell to
escape through said fibrous stock, and then al-lowing said filler to solidify While said inner shell
is submerged.
heating the contents of said inner shell prior to
inserting said inner shell in said outer shell, and
maintaining said inner shell submerged in said
filler and impregnating agentand spaced from
4. The method of sealing and creating a vacu
um Within a container of ñbrous stock as deiined
ing agent is allowed to cool and solidify. »
in claim 3 including t-he stepsof heating the con
tainer of fibrous stock Whichis impervious to
liquids and gases comprising the steps of partls7
tents of said inner shell to a temperature above
normal atmospheric temperatures prior to insert
ing said inner shell in said outer shell, and in
serting said inner shell in said outer shell while
said outer shell while said liller and impregnat
7. The method of making a double Wall con
ñlling an open outer shell of ñbrous stock with a
molten ñller and impregnating agent which is
normally solid at atmospheric temperatures, in
said contents are heated.
serting a closed inner shell of ñbrous stock in
5. The method of making a container of fibrous
said outer shell while said ñller and impregnat
stock substantially impervious to liquids and 15 ing agent is molten to extrude said filler and im
gases comprising the step of partly ñlling an open
pregnating agent between the Walls of said shells
outer shell of fibrous stock with a quantity of
and to impregnate, at least partly, a portion of
molten ñller and impregnating agent which is
the surfaces of the Walls of said shells, closing
normally substantially solid and impervious to
said outer shell, and then inverting said shells
the liquids and gases to which it is desired to
while said ñller and impregnating agent is still
render the container impervious, inserting a
molten but While said shells are cooling to im
closed inner shell of ñbrous stock in the outer
pregnate, at least partly, the remainder of the
shell While said ñller and impregnating agent is
inner surface of the Walls of said outer shell and
still molten to extrude said filler and impreg
the outer surface of the walls of said inner shell.
nating agent between the Walls of said shell, al- 25
8. The method of making a double Wall con
lowing said ñller and impregnating agent to cool
tainer of iibrous stock as defined in claim 7 in
and solidify, pouring »an additiona1 quantity of
cluding the steps of heating the contents of said
ñller and impregnating agent in said outer shell
inner shell prior to inserting said inner shell in
to iill said outer shell completely with said ñller
said outer shell, and maintaining said inner shell
and impregnating agent, and then closing said 30 spaced from said outer shell while said i-lller and
outer shell.
impregnating agent is solidifying and impregnat
6. The method of making a container of fibrous
ing the Walls of said shells.
stock substantially impervious to liquids and
gases as deñned in claim 5 including the steps of
FRANK GILBERT, JR.
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