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Патент USA US2403855

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' @559, ‘1946.
Z12 .
MW ‘3% g
. 2,403,855
Frank .iGilbert. vJr, Olmsted Falls, ‘Ohio
. _
, Appucaitn Julylo, 1942, Serial/No. 450,378
1 2
This invén?oeipériainsto‘ imrirorémehis "i1?
/ I made
i I
vof standardc aps and,
so_ _
cia1 I convertingv machinery for forming the . 636125
' and disks is notr'equiredf Because of the strength‘
container closures'and a method OfHCIOSIiHgCOH-f
tainers.v _'More particularly, this inventionrelates
to stiff, water and jmoistureproof, paper closures ' ' andfrigidityof. my improved ;endj closures, they
for cans, jars/bottles, andthe like,.,as. wellfas
~ may _be employed as the ; end ,closuresllof large
‘ giamemepaper containers, such as one, twojcand
five gallon buckets and pails, for example. ;' j; j,"
for, rigid; and ‘s'emi-rigid_i_ paper containers. @This
application is .a .continuationein-part of my. 00,-.
pending applicatiom SerialiNp. 441,649, ?led _May
“It is. another object ofmy invention.t_o..,pro-,v
vide' a paper closure which is I substantially ' m'oisa
'ture and vaporproof andprovides a substantially
Paper container closuresorv en'dfmembers have
permanent seal for cans, jars,'bottles, and)‘: the
long been employed for tubular'paper contain-_
ers. Paper containers for dry, light-weight prod
like, as well as for paper, containers.
advantage’of my invention that it may befsub-i
stituted for, the relatively expensivetin', covers
utcs not critically affected by moisture, usually
are comprised of a wound tube of paper stock‘ 15 and closures heretofore employedi-as'closures for
ucts, such as, forexample, cereals or like prod
closed with adhesively secured. paper caps. Such
paper caps are stamped or formed from a sheet,
of lightly calenderediand sizedfpaper stock, usu
' jars of many foodstuff and other products. 1 ‘An:
, other advantage of my invention is that no gas.
keting. material,'_ such .
ally while the stock is damp,rso that the caps are
provided with an integral?ange. _ Although such
caps are inexpensive,v the. porosityof the stock
as rubber, cork, lorwthe
A still furtheradvantage of, my invention is
that, while heavily calendered and, sized,.>D.aper
stockmay be'employed in some instances, in most
instances cheap porous stock is preferred for my
from which the caps are made generally renders _‘
the caps unsuitable’for’ packages of wet or liq
uid products. When wet orliquid products, such
as,-for example, ice cream, pickles, and the like, 25
Other objects and advantages
' . of my
“ V
are packaged in tubular paperfcontainers, such con
will be apparent from the following speci?cation,
tainers are usually wound tubes'of heavily cal
claims,and'drawings' in which:
.Fig. 1 is an exploded, sectional viewillustrating
endered and sized paper stock spun in at one
end to provide a seat for a tightly'z?tting pa- '
one method of making my closures.v j
Fig. 2 is a sectional view of a tubular paper
per closure disk; the closure for the other end
of such tubes is usually a slip cover comprising
container closed at one end with a reinforced
a short tube spun in to. provide a seat for a sec
closure made according to my invention.
ond tightly ?tting paper disk. Such tubular con
tainers for wet or liquid products are often coated
Fig. 3 is a sectional View of‘a'modi?ed rein
or waxed to render the containers substantially ,
forced closure made according to my invention.
Fig. 4 is a sectional view of a wide mouth glass
water and moistureproof. Even when such disk
closed paper containers are thus waterproofed,
container closed with a closure made according
In- the-drawings, in which like reference char
acters refer to like parts or elements, the thick
nesses ofthe elements arev distorted for clarity
of illustration. In Fig. 1, l0 represents a stand'_
they are generally employedonly as more orv 168$
temporary containers‘ and seldom ‘as permanent
containers for’ wet or liquid products.
1 When tubular paper containers are employed
vard stamped‘cap of relatively porous paper stock
for packaging. heavy products, either wet or dry,
provided with a ?ange II integral with the bot
relatively inexpensive metal endclosures are gen
erally erimpedon the ends of_ the paper tubes, 4 5 tom l2. A quantity of a normally substantially
solid impregnating and ?lling agent 20 is poured
particularly when .the',cross-sectional area of the ;
in the cap ill in, a liquid and impregnating con‘
tubular container is relatively large. ? In such in
dition. While the impregnating agent/2U is' in a .
istances,vstandard paper closures possess neither
liquid and impregnating condition, a porous pa
per ,reinforcingsheet 3B, is immersed in ‘the im
pregnating agent 20. ‘The reinforcing sheet 30‘is
theJStrength nor rigidity afforded, by the metal
, . It isan object
‘of- this invention to provide a
reinforced ‘paper container closure which ap
~ preferably a disk or sheet of porous paper-board,
proacheslthe strength and rigidity of. the metal
end ' closures employed heretofore.
It is a par
.ticular' advantage of_ my invention that the pa
:perv elements of .my, reinforced closure may be} 55 a
such as the'corrugated paper-board comprised of
a corrugated-sheet 3| and cover sheets 32 and
33, as shown inFig. 1.v
' ,
7 ‘Due to the porous and capillary nature ofv the
cap HI and the reinforcing sheet 30, the liquid
impregnating agent wicks into the inner surface
of the cap l0 and into all ?brous elements of
the reinforcing sheet 30 as well as ?lling the
interstices of the corrugations of the sheet 3|.
Due to entrapment of air and slight shrinkage
‘of the impregnating agent upon solidi?cation,
slight voids 2| in the impregnating agent may
ployed, a convenient manner ofsecuring the clo
sure to a container is to seat the open end of
the container, having outside diamensions equal
to the inside dimensions of the ?ange ||, against
the reinforcing sheet 30 as the impregnating
agent is allowed to cool. In such instances, the
impregnating agent will creep between the inner
wall of the ?ange and the outer wall of the con
tainer so that, upon solidi?cation of the impreg
be ‘found under the corrugations in the sheet
3| and the cover sheet 33. Due to the ?lm 10 nating agent, the closure will be securely sealed
to the container. If the container is a spirally
wound paper tube 40, as shown in Fig. 2, the im
pregnating agent will also impregnate the closed
end of the container to a certain extent, de
ing a su?icient quantity of impregnating agent '
20, a ?lm 23 of impregnating agent will cover 15 pending upon the porosity of the paper in the
strength of theimpregnating agent, a ?lm 22,
of impregnating agent will usually separate the
bottom I2 from the cover sheet 32. ‘By employ-E
the cover sheet 33.
By allowing the impregnating agent 20 to so
lidify, the cap l0, impregating agent 20‘ and. re- >
inforcing sheet 30 become a strong and especially
container All.
Fig. 3 shows adisk type of paper closure made
according to my invention, in which a spira1
wound paper container I40 is closed in the con
rigid unit in which the paper elements are thor-r 20 ventional manner by a disk I | 2 seated on a spun
in flange |||._ ' The closed container I40 thus af
oughly united by the solidi?ed impregnating
fords a shell, similar to the cap ||, for'receiving
agent.- For some reason, the impregnated ?brous
a quantity of the liquid impregnating agent 20.
paper elements appear to have greater strength
A reinforcing sheet |30 of porous paper stock is
and rigidity than the sum of the strength
and rigidity of the paper elements and an equal 25 then immersed in the liquid impregnating agent.
As the impregnating agent solidi?es, it thorough
thickness of the impregnating agent. Without re- _
ly impregnates the reinforcing sheet I30, the
stricting myself to one theory, I believe this
inner surface of the disk H2,‘ and the inner sur
greatly increased strength is due to the relatively
face of the container M0, thus providing a strong,
high ?lm or surface strength of the impregnating
agent. By impregnating the agent in the ?brous 30 rigid, and sealed closure.
My reinforcing sheet need not be a sheet of cor
elements and providing a plurality of ?lms of
rugated paper-board, as shown in Figsfl to 3,
the agent, the surface area of the solidi?ed im
but may be a single ply of porous'paper stock,
pregnated agent is many times greater than the
such as paper-board, straw-board, chip-board,
surface area of a homogeneous quantity of im
or the like. Further, my closures are not limited
pregating agent of the same thickness. The voids
to use on paper containers, An example of a
2|, unless excessive, do not appear to appreciably
single ply reinforcing sheeet and an example of
decrease the strength and rigidity of the closure,
my closure applied to a container having non
since, as pointed out above, the strength of the
porous walls is shown in Fig. 4. A paper cap 2H1
closure appears to be ‘primarily attributable to
40 having a ?ange 2| | integral with the bottom 2|2
the impregnated paper elements.
is ?lled with a quantity of liquid impregnating
As is apparent from the foregoing, the impreg
agent 29. A single ply reinforcing sheet 230, in
nating agent should be normally solid but should
be obtainable in a liquid and impregnating con
this instance previously secured to the mouth of
dition. It is also preferable that the impreg
nating agent be impermeable to the liquids and
gases either which should be retained in the pack
a glass 240, ?lled, for example, with jelly, is then
immersed in the impregnating agent. In order
aged contents or from which the contents should
be protected. Such liquids and gases are com
monly water and water vapor. The impregnat
ing agent is preferably meltable in order that
heat alone will render the impregnating agent
liquid, although soluble impregnating agents or
that the impregnating agent 2|] may also serve
as a seal, it should also wet the. surface of the
non-porous container 240. Thus, a sufficient
quantity of the impregnating agent is employed
so that when the mouth of the container closed
by the reinforcing sheet is immersed in the im
pregnating agent, the impregnating agent will be
forced up between the ?ange 2H and the walls
of the container. Due to the wetting action of
inous condensation products may be employed. I
have found that an inexpensive'impregnating 55 the impregnating agent, the agent will tend to
creep up the outer walls of the container 240.
agent which is normally solid, water and mois
When the impregnating agent has solidi?ed, a
ture vapor proof, and meltable. is a solution or
thoroughly sealed rigid closure for the glass 240
mixture of paraf?n wax and pine rosin. ' Such
will be provided.
a mixture is solid but less brittle than either of
In the embodiments disclosed, the reinforcing
its-constituents. Where the paraffin-pine rosin 60
sheets have been impregnated by immersing the
impregnating agent is not su?iciently inert to
porous reinforcing sheets in a quantity of liquid
the products to be packaged, a wide range of
impregnating agent in the standard paper. clo
other, but usually more expensive impregnating
sure. This method is usually preferred because
agents are available to those skilled in the art.
For example, a particular inert impregnating 65 of the simplicity of operation and because no
special closure forming machinery is required.
agent which will greatly increase the strength,
However, the standard closure and reinforcing
rigidity, impermeability, and hardness of the clo
sheet may be impregnated separately and then
sure is alcohol-modi?ed urea-formaldehyde resin
united. by placing the impregnated reinforcing
condensed and polymerized (thermo-set) in the
70 sheet in the impregnated closure. The applica
?bers of the paper elements.
agents which are polymerizable or which are res
When a reinforced cap type of closure, such
as shown in Figs. 1 and 2, is employed, the clo
sure may be secured to a container with suitable
adhesives. When a meltable impregnating agent,
such as my paraffin-pine rosin mixture, is em
tion of heat and pressure, in the case of meltable
impregnating agents, or a solvent andpressure,
in the case of soluble impregnating agents, will
weld the impregnated closure and reinforcing
75 sheet together. Another satisfactory method of
impregnating the closure is to punch a plurality
of holes through the reinforcing sheet before the
uct or container may not be satisfactory for
reinforcing sheet is placed in a cap.
tion is not limited to the speci?c embodiments
disclosed, but may be varied by those skilled in
the art within the scope of the appended claims.
The cap
and reinforcing sheet are then secured over one
end of an open ended tube. A quantity of liquid
impregnating agent is then placed in the con
tainer so that the impregnating agent will im
others. It is apparent, therefore, that my inven
What "is claimed is:
1. As an article of manufacture, a stamped
pregnate the exposed surface of the reinforcing ' 7 ‘paper cap comprised of an integral bottom por
sheet and, by ?owing through the holes in the
reinforcing sheet, will seep between and impreg
tion and a ?ange portion, a reinforcing sheet of
corrugated paper comprised of a central corru
nate the adjacent surfaces of the reinforcing
sheet and the cap. The few small holes in the
reinforcing sheet do not materially affect the
gated sheet and cover sheets, said reinforcing
sheet being located within said cap and covering
the inner surface of said bottom portion, and a
strength of the reinforced closure when the im
solid impregnating agent substantially completely
pregnating agent has solidi?ed.
15 ?lling the voids of said reinforcing sheet and im
pregnating the inner surface of said cap to unite
Meltable impregnating agents containing sub- _
stantially no volatile solvents are generally pre
said cap and reinforcing sheet into a rigid con
tainer closure.
ferred. Solvent loss, the minute porosity caused
2. The method of making a, rigid paper con
by evaporation “of the solvent, and escape. into
and possible contamination vof the contents of the 20 tainer closure comprising the steps of placing a
quantity of normally solid molten impregnating
closed containers are thus avoided. When melt
agent in a paper container closure cap, immersing
able impregnating agents are employed, ‘care
must be taken to secure thorough impregnation
of the paper elements of the closure by prevent
a paper reinforcing sheet in said molten impreg
cap and sheet, and then allowing said impreg
nating agent to become solid to unite said impreg
nating agent, allowing said impregnating agent
ing an over-rapid cooling of the impregnating 25 to-impregnate adjacent surface portions of said
Where my closure is used toseal a con
,tainer ?lled with heated contents ‘at or near the
melting point of the impregnating agent, such
over-rapid cooling is usually prevented. Other
wise, it is often advisable to apply heat by suit-‘
able hot plates or ovens until the impregnating
nated cap and sheet. -
3. The method of sealing and reinforcing the
bottoms of containers comprising the steps of
placing in an open-ended paper container having
a porous paper bottom a quantity of normally
4 solid impregnating agent while said agent is in
Although the paper containers in the embodi
a liquid state, immersing a sheet of porous paper
ment disclosed have wall portions which are
made of spirally wound paper tubing having a 35 stock in said impregnating agent to cover the
agent thoroughly impregnates the closure.
circular cross-section, it is not to be understood
, that my invention is to be limited to paper con
tainers having such wall construction. For ex
ample, my invention may be employed to rein
bottom portion of said container, allowing said
impregnating agent to impregnate adjacent pore
tions of said reinforcing sheet and said con
tainer, and then allowing said impregnating
force the closures of the so-called “collapsible” 40 agent to solidify.
4. The method of closing containers compris
cartons in which the walls are formed from a
ing the steps of placing in a paper cap a quantity
of normally solid impregnating agent while in a
liquid state, covering the mouth of a container
are normally formed by interfolded ?aps integral
with the tubular walls. Therefore, it is to be un 45 with a paper reinforcing sheet, inverting said
container and forcing the paper sheet covering
derstood that the term “tubular paper contain
the mouth of said container below the surface of
ers” as employed in the claims may apply to
the liquid impregnating agent in the cap, said
wound containers,‘ either spiral or convolute, or
cap, container mouth, and quantity of impreg
folded containers, of either the collapsible or set
up type, and that the term “tubular” applies to 50 nating agent being so proportioned that a portion
of the impregnating agent will be extruded be
tubes having a polygonal cross-section as well as
the cap and the walls of the container ad
a circular cross-section.
jacent the mouth of the container, allowing said
From the foregoing, it is apparent that the em
impregnating agent to impregnate adjacent sur
bodiment disclosed may have to be varied by
face portions of said cap and sheet, and then 3.1- ,
those skilled in the art to meet the needs and re 55 lowing
said impregnating agent to solidify to unite
quirements of speci?c types of containers and
and sheet into a rigid container closure
products to be packaged in such containers.
blank of paper stock formed into a. tube having
a rectangular cross-section and the end closures
Further, normally solid impregnating agents
which may be satisfactory for one type of prod.
sealed to said container.
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