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Патент USA US2397589

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April 2, 1946-
Filed May l, 1945
Patented Apr. 2, 1946
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` Herbert A. Barnby and Jack M. Wheaton, Toledo, .
Ohio, assîgnors to Owens-Illinois Glass Com
pany, a corporation of Ohio
Application May 1, 1943, Serial No. 485,320
4 claims. _ (c1. zie-3s)
Our invention relates to caps or closures- for
external spiral bead or screw thread "Iy adapting
jars, bottles and other containers. An object of
the >jar for use with a screw-threaded cap or ring.
the invention is to provide a novel and practical
The cap is of laminated construction compris
cap for closing and hermetically sealing a contain
ing superposed layers or >disks of suitable mate
er to' which it is applied. The invention provides
‘ rial bonded together by layers of adhesive. The
a cap which is particularly adapted for use With
cap as shown has an inner layer II` of wax, ap
jars or other'containers in which foodstuiîs are
plied to the under surface of a layer or‘disk of
packed and sealed by processes which result in
forming a partial vacuum within'thje container.
oil paper I2, alayer of'pulpboard I4 overlying the
disk I2 and secured .thereto by an interposed lay
Such a vacuum process is extensively used in 10 er I3 of adhesive material, a layer i6 ofykraft
canning fruits, vegetables, and the like, in which
paper or the like overlying the pulpboard and
process’ the jars are filled and the caps applied
bonded thereto by a layer I5 of adhesive. The
while the material is at a high temperature, so
uppermost section. or layer of the cap provides» a
that as the contents of the jar cools, the steam
-cap shell which comprises a disk-2ß of kraft pa
or vapor is condensed and produces a partial 15 per or the like formed with a. skirt 2| which sur
rounds the subjacent laminations- andV extends
An object of our invention is to provide a cap
downwardly >into» position to surround the beadwhich is readily applied to the -jar and makes
l, such bead serving to hold the capcenterecl on
an effective and permanent seal.
the jar. An inner layer I8 of jutepaper is
A further object of the invention is to provide 20 bonded to the kraft paper 20 by an interposed
a cap of the character indicated which is adapt
layer I9 of adhesive and provides a `lining for the
ed for use with various styles of jar tops or 1in
cap shell.` A layer il of adhesive material is pro
ishes, and which does not require> any special
vided between the laminations ‘I8 and I6. It will4
fastening means for securing the cap`
be seen that the laminations comprised in the
A further object of the invention is to provide 25 cap are bonded together by adhesive in a manner
such a cap which may be readily and repeatedly
to form an integral or lone-piece cap.
applied to and seal the container independently
The layer tI is a sealing material. preferably
of any vacuum, so that when only a part of the
of an amorphous petroleum wax, which atv the
contents is dispensed atY a time, the remaining
temperatures to whichit is subjected during the
portion may be resealed until needed.
vacuum sealing operations', `is of a consistency
A further object of the invention is to provide
adapting it to making an effective seal, and'which
a cap or closure of the character indicated which
at normal living room temperatures remains suf
is made of inexpensive materials which are read
ficiently soft and plastic to make a good seal when
ily available and which serve as an eiiicient sub
applied with aslight pressure to the container.
stitute for the usual metal caps. .
The cap is thus adapted to be repeatedly applied
Other objects of the invention will appear here
to the container and make an airtight seal when
applied at normal living room temperatures.
Referring to the accompanying drawing:
The petroleum wax may have added thereto, a
Fig. 1'is a fragmentary sectional elevation of a 40 small percentage of any suitable viscous material
glass jar with a cap placed in position thereon.
which‘increases the adhesive qualities of the wax
Fig. 2 is a similar view but with the cap bowed
and pr‘events crystallization at low temperatures.
downwardly owing to the partial vacuum with
We have found that a small percentage of the
in the jar.
commercial product known as “Vistac'Nd 2" add
Fig. 3 is a View similar to Fig. 2, but with the 45 ed to the petroleum wax is satisfactory for this
thickness of the various layers of material form
purpose, such product being a synthetic hydro
ing the cap, greatly exaggerated for the purpose
carbon of the polybutene type having a molecu
of illustration.
lar weight of approximately 6000.
Fig. 4 is a fragmentary view on a larger scale,
The layer I2 of oil paper, being nonporous
of a portion of the cap as applied to the jar.
50 and impervious to moisture, cooperates with
Fig. 5 is a diagrammatic plan View of the cap
the layer Il of Wax to make a reliable and per
with the layers of material progressively broken
manent seal. The disk I4, preferably consist
ing of a iirm pulpboard of substantially greater
The closure device or cap C is shown applied
thickness than the adjoining layers of paper,
to a glass jar J »having a neck 6 formed with an 55 serves to stiffen and strengthen the cap as -a
whole. Vwehave found that a thickness or .05 ï
inch gives satisfactory results. The kraft paper
lamination I_B is comparatively thin but provides
a strong, tough, iìexibleV layer which greatly adds ‘
to the strength of the cap.
The cap shell which comprises the kraft paper
20 and its inner lining I8 of jute bonded thereto -
by the layer I9 of adhesive, serves to Strengthen
the cap as a whole ancljincrease'sits resistance
to bending stresses.v It oiîers effective resist
seated on the vacuumized container, said shell
comprising an outer layer of kraft paper, an
inner lining of'jute paper, and a layer of ad
hesive bonding said jutepaper to the kraft paper,
y said shell providing means for strengthening the
cap and eiïectively limiting theV degree of said
downward flexing.
3.,A cap for closing and sealing a container,
comprising superposed laminations including an
inner layer of wax which is soft and-‘plastic at
ance to the bowing downward of the cap under `
,normal living room temperatures, a superposed
atmospheric'pressure when a partial vacuum is
lamination of oil paper, a lamination of pulp
board overlying the oil paper and bonded there
to by a layer of adhesive material,and a cap
ModificationsY may be resorted'to withinïthe 15 shell comprising alsheet of kraft paper overlying
the pulpboard and formed with a marginal skirt
spirit and scope of our invention.
surrounding said laminations and extending
We claim:
downwardly'therebelow, a lamination of kraft
1. A cap for closing and sealing a container, y
comprising superposed laminations including _ an , ‘ paper interposed between said pulpboard and the
inner layerV of wax which is soft and plastic at v20 cap shell, and layers of adhesive material inter
posed between and bonding together the pulp
normal living room temperatures, a 'superposed'
board and said lamination of kraft paper and
lamination of oil paper, a lamination of pulp
and bondingrtogether the said kraft
board overlying the oil paper and :bonded there- `
paper and said cap shell, the thickness of the
to by a layer of adhesive material, a paper cap
pulpboard lamination ‘being of the order of .05
shell overlying the pulpboard and formed with a
and the adjoining layers of paper kof sub-v
marginal skirt surroundingV said laminations and
stantially less .thickness than the pulpboard, the
extending downwardly therebelow, and means
cap as a whole being fortified by the cap shell
for bonding said shell `to the’pulpboard, the
Y against excessive deformation or bowing when
laminationy of pulpboard being of substantially
subjected to the -suctional action of a partial
greater thickness than'the adjoining layers of so
vacuum within the container.A
paperand'the cap as a Whole being -sufllciently ,
V4. A cap providing aA closure for containers,
'soft and Vflexible to> permit a-substantial down
said cap being of laminated construction corn
ward iiexing or bowing under atmospheric pres
- prising superposed laminations consisting‘re
formed within the container, and thus prevents
excessive deformation or bowing of the cap.~
sure when the cap is seated on and sealed to a
container. .
2. Arcap for closing andY sealing a container,
Y comprising superposed laminations including an
inner layer of wax which-is Soft and vplastic at
' normal livingroom temperatures, a- superposed
lamination of >`oil paper, .a >lamination of -pulp- i
board overlying'the oil paper and bonded there- Y
toY by a layer of adhesive material, a cap shell
overlyingthe pulpboard and formed with a mar
spectively of kraft paper, jute paper, kraft paper,
pulpboard, and oil paper in the order mentioned,
with interposed layers of adhesive material'be
tween said laminations `and bondingthem to
gether, the outer lamination of kraft paperserv-r
ing as a cap shell and being`> formed -with an
integral marginal skirt surrounding >Said other
laminations, the thickness of the' pulpboard
lamination being of the order of .05 inch and the
- adjoining layers of Ypaper of substantially less .
ginal skirt Ysurrounding'said laminations and 45 thickness than'the pulpboarfLthe cap as a whole
extending downwardly therebelow, and means
being fortified by the cap Shell against excessive
for bonding said shell to the pulpboard, the pulp
kdeformation or bowingrwhen Vsubjected to the
board lamination being of greater thickness than
suctional action of a partial' vacuum within'> the »
they adjoining layers'of papen and the cap asa
whole being su?cientlysoft and flexible to per 50
mit a substantial downward flexing of the cap
under atmosphericV pressure' 'whenv the cap isy
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