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NOV. 26, 1946.
R GUYER ETAL '
I
2,411,622
' 'MOLD‘ED CARTON CONSTRUCTION
Filed oct. 4, 1945
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Patented Nov. 26, 1946
I
2,411,622
UNITED STATES ‘PATENT OFFICE’
2,411,622
MOLDED CARTON CONSTRUCTION
Reynolds Guyer-and Robert M. Dunning, St.
Paul, Minn., assignors to Waldorf Paper Prod
. ucts Company, St. Paul, Minn., a corporation‘
of Minnesota
' Application October 4, ‘1943, Serial No. 504,820
. 7 Claims.
1
Our invention relates to an improvement; in
carton construction wherein it is desired to pro
vide a novel type of sift-proof carton having
molded corners thereupon.
The recent application of Reynolds Guyer,
(Cl. 229-135)
2
to retard or prevent the natural tendency for the
carton stock to return to its normal position.
As a result selected portions of the carton, such
as the‘ corners thereof, are stiffened and sealed,
thereby sealing any. aperture which previously
Serial No. 485,726, described a carton construc
occurred at‘ the .corner and also protecting the
tion in which the corners of the cartons were
corners of the cartons so molded‘ from developing
molded, preferably by pressure, heat, or both so
any apertures. As a result the carton is effec
that any small aperture in a corner of the carton
tively
sealed and tends to remain sealed even
will be sealed. In this application the corners 10 when carelessly handled.
‘
'
of the carton and any or all of the external seams
These and other objects and novel features of '
thereof could be molded so as to change the form
our invention will 1be more clearly and fully set
of the stock of which the cartons were formed at
forth in the following speci?cation and claims.
certain points thereof. In the preferred embodi
In the drawing forming a part of our-speci?
- ments of the former invention the corners of the
carton were either moistened before being molded
with pressure or with combined pressure and heat
to liberate the ?bers of the carton stock to some
‘cation:
Figure 1 is a, perspective view of a typical carton
before the molding operation.
Figure 2 is a perspective view‘ of the same car
extent, or else the carton was coated with a coat
ton after the molding operation.
3
"
ing of suitable material such as wax and this 20
Figure 3 illustrates a section of paper of which
wax was caused to impregnate into the material
the carton may be formed, showing a laminated
of which the carton was‘ formed in the molded
areas.
'
-
construction thereof.
_
'
\
_ Figure 4 is a diagrammatic view, of a typical
We have found that if the cartons are formed
carton blank and showing a coating of thermo
of certain types of material, the molding opera 25 plastic material applied locally at the areas most
tion has a tendency to set the stock in molded
likely to develop sifting.
formation without the necessity of a separate
Figure 5 is a view similar to Figure 4 illustrat
coating. For example if the carton is formed
ing another manner of applying thermoplastic
of two sheets of paper laminated with a laminat
material locally to a typical carton blank.
ing agent which softens upon application of heat 30 Figure 6 is another diagrammatic view similar '
and pressure, the carton corners may be molded
to Figures 4 and 5showing still another manner
to their proper shape with a heated die or the
of applying thermoplastic material to a typical
like and held in molded position until set. The
carton blank.
laminating material softens during the molding
. 'I'he carton ,A illustrated in Figures 1 and 2 of
process and then sets in molded form, holding the 35 the drawing may be of any desired shape or form.
box corners in molded'shape. ~
The carton illustrated comprises rectangularly
A feature of the present invention lies in the
arranged side and end walls such as l0 and II,
provision of a carton formed with a normally in
and top and-bottom walls such as l2. Before the
.active substance therein; such as a laminating
molding operations square corners are provided
material, an ingredient'formed directly in the 40 between the various walls of the carton. After
paper, or a normally inactive coating on the ma- .
the molding operation, however, the corners are
terial, which when heated softens to permit the
formed inwardly and somewhat rounded in the
stock of which the carton is formed to be molded
manner indicated in Figure 2 of the drawing, the
into the desired con?guration. Upon reharden
rounded corners being- designated by the .nu
ing after the molding process, the carton corners 45 meral l3.
.
p
remain in molded shape and therefore the grad
The molding of the carton can be accomplished
ual return of the carton to its original shape and
by various methods, such as by applying a heated
the consequent reappearance of minute apertures
die to opposite ends of the carton so as to mold
therein is prevented.
.
>
the corners thereof.
'
A further feature of the present invention lies 60
We have found that if the carton is laminated
in coating, impregnating, or embodying in at least
and formed of two or more thicknesses of ‘ma
selective portions of the carton stock a material
terial, such as is indicated by the numerals i4
which tends to soften upon application of heat
and IS in Figure 3 of the'drawing, and if the
suf?ciently to seal the interstices in the carton,
laminating material I6 is of the type to soften
and which upon cooling will stiffen su?lciently 56 upon application of heat, the carton comers may
atlases I
3
of the drawing and molded into the mm illus=
be made to retain their molded condition at the
completion of the molding operation. For ex
ample, if asphalt is used as the ‘mating agent
trated in'Figure 2 of the drawing, the areas dd .
will be found to have softened, impregnated into
the stock forming the carton, and ?ll‘the inter
I6, by heating the mold suf?ciently to soften the
stices at the corners of the carton. In this type
asphalt during the molding operation and by
holding the molded corners in molded form dur
the asphalt will harden
of construction only the portions of the container
most likely to sift are protected.
sults. Such thermoplastic resins must be selected
lines 5| and 52 to end closure ?aps 53, BI, 55 and
, ing the cooling process,
Figure 6 illustrates a similar form of construc
in molded formation and resist the return of the > tion in which panels 6!, 46, 41, and 49 are fold
carton stock to its original position.
ably connected along vertical fold lines, the pan
Materials such as thermoplastic resins have 10 els being connected together by a glue ilap 50.
also been used for this purpose with excellent re
The panels are connected along parallel fold
so as not to injure or 'a?ect the material being
58 arranged to fold together‘ to form an end
packaged. Rosin bearing resins have been used
closure. In this construction themarginal edges with good results for the purpose, although such 15 of each of the ?aps 53, 54, 56, and 56 are coated
materials are preferably used in locally coating ' with a strip of thermoplastic material 51, which
selected portions of the carton.
-extends somewhat beyond the fold lines BI and
Normally dry adhesives have‘ also been used’ 2 52 so~ as to completely encircle the corners‘ of
with good success in laminating or coating. se
the carton after the same has been folded. Upon >
lected areas of the carton stock. Certain such 20 application of heat and pressure to the ends of
adhesives which have been used include mix
tures of resin, rubber and size, which are nor
mally elastic, but which include su?lcient resin
to prevent the molded carton corners from re
turning to their normal state.
Such materials
have a tendency to impregnate into the carton
stock upon application of heat and be spread
through the stock, facilitating the maintenance
the carton, the thermoplastic material 51 will
soften and fill any interstices through the car
1 ton, completely sealing the edges of the various
flaps together. If ‘a cement is used for sealing
25 the flaps, which is sensitive to heat, the entire
ends of the carton may be heated, only the coated
portions thereof being affected by this heat.
It will be noted that the foregoing construc- 7
of the rounded comer construction.
tion holds the molded corners of the carton in
In Figure 4 of the drawing we disclose a typical 30 molded formation, acts to fill the carton comers,
carton blank formed of a series of side wall pan
and acts to prevent the corners from breaking
open or sifting ‘during transportation or handling
thereof. If it is desired the thermoplastic ma
means of a glue flap 22. These panels are con
terial may be added directly to the carton stock
nected along substantially aligned fold lines 23 35 in place of using the same as a laminating agent,
and '26 to end ?aps 25, 26, 21 and 29. These
or inv place of coating the same on selected por
end ?aps are designed to fold together to form
tions of the carton blank, each of these construc
a carton closure at each end of the carton, as is
tions having individual advantages and disad
common practice.
vantages over the other forms of construction.
40
In the formation of the carton a band of
In accordance with the patent statutes, we have
thermoplastic material 80 is coated along the
described the principles of construction and op
fold line 28 to extend on opposite sides thereof.
eration of our carton construction and while we
A similar band Si is coated along the fold line 24v
have endeavored to set forth the best embodl- to extend on either side of the fold. Thus the
ment thereof, we desire to have it understood
thermoplastic material is provided encircling the
that obvious changes may be made within the‘
carton where the various end flaps are connected
scope of the following claims without departing
els l1, I9, 20 and 2|, foldably connected along
parallel fold lines and connected together by
1
to form a closure. As apertures most frequently ,
occur at the corners of the carton the thermo
plastic material is thus coated adjacent
the corners.
all of
from the spirit of our invention.
We claim:
’
l..A sealed package comprising a series of
panels connected together to completely enclose
the package contents, the material composing
,
It will be noted that upon application of heat
and pressure to the corners of the carton blank
the panels including at least in the area of the
trihedral corners at one end of the carton a
illustrated in Figure 4, the thermoplastic mate
rial adiacent the corners of the carton and ad
jacent the seams thereof will be heated and -.
thermoplastic material, each said trihedral cor
ner having its apex compressed in predetermined
caused to impregnate into the carton stock, ?ll
ing any interstices between the various ?aps and
beveled or rounded form,.said thermoplastic ma- '
terial operating ‘to hold said corners permanently
panels at the corners of the carton. Thus the
corners will be effectively sealed and the car
in said predetermined form.
In Figure 5 of the drawing we disclose a blank
- similar to that illustrated in Figure 4 of the draw
pletely enclose the carton contents, the material
ing, and including wall panels 32, 33, II, and 35
- composing the panels including at least in the
connected by fold lines and adapted to be con
nected together by means of glue ?aps 36. These
panels are connected along a fold line 31 to end
area of the trlhedral corners between the panels
and end walls at one end of the carton a thermo
plastic material, each said trihedral corner hav
closure flaps 39, 60, ll, and i2, and are connected '
ing its apex compressed in predetermined beveled
along the fold line 43 to similar end closure ?aps
inner section of the fold lines 3i and 63 with the
-
2. A sealed package comprising a tubular car
ton formed of a series of connected wall panels.
and end panels closing the ends thereof to com
ton rendered sift-proof.
39, Mi, M, and £32.v
In order to seal the carton areas it of thermo
plastic material, they are'provided adjacent the
‘
'
. or rounded form, saidthermoplastic material op
A
erating to hold said corners permanently in said
' predetermined form.
3. A sealed package comprising a carton hav
ing rectangularly arranged carton wall panels
vertical fold lines separating the various panels
connected together and end panels connecting
forming the carton walls. After the carton has
the ends'of said wall panels to completely en
75
been folded into the form illustrated in Figure 1
2,411,022 4
5
close the carton contents, the material compos
ing the panels including at least in the area of
hold said corners permanently in said predeter
mined form.
the trihedral corners at one end of the carton
a thermoplastic material, each said trihedral
corner having ‘its apex compressed in predeter
.
-
6. A sealed package comprising a carton hav
ing rectangularly arranged carton wall panels
connected together and end panels connecting
the ends of said wall panels to completely en
close the carton contents, the material compos
ing the panels comprising sheets of cellulosic
material laminated together with a thermoplastic
mined beveled or rounded form, said thermo
plastic material operating to hold said corners
permanently in said predetermined form. I
4. A sealed package comprising a series of
panels connected together to completely enclose 10 adhesive, each trihedral corner at at least one
the package contents, the material composing the
end 01‘ the carton having its apex compressed in
panels comprising sheets of cellulosic material
predeterminedv beveled or rounded form, said
laminated together with a thermoplastic adhesive,
thermoplastic adhesive operating to hold said
each trihedral corner at at least one end of the
carton having its apex compressed in predeter
mined beveled or rounded form, said thermoplas- tic adhesive'operating to hold said-corners per- ~
manently in said predetermined form.
15
corners permanently in said predetermined form.
'7. A sealed package comprising a series of
panels connected together to form a substantially
rectangular carton to completely enclose the‘
package contents, the material composing the
‘5. A sealed package comprising a tubular car
panels including at least in the area of the tri
ton formed of a series of connected wall panels, 24) hedral corners of the carton‘ a thermoplastic
and end panels closing the ends thereof to com
material, each trihedral cornerhaving its apex
pletely enclose the carton contents, the material
compressed in predetermined beveled or rounded
composing the panels comprising sheets of cel
form, said thermoplastic material operating. to
lulosic material laminated together with a ther
hold said corners permanently in said predeter
moplastic adhesive, each trihedral corner at at 25 ' mined form.
least one end of the carton having its apex com
REYNOLDS GUYER.
pressed in predetermined ‘beveled or. rounded
ROBERT M. DUNNING.
form, said thermoplastic adhesive operating to
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