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April 16, 1963 DEVICES- FOR5- FORMING
J- HOYRUP
ETAL
3,085,479
HEIAIP SEALABLE BLANKS
INTO BOX FORM AND METHOD
Filed July 25, 1961
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INVENTOR.
Sigurd Johannes Hqyrup
Richard M Pagendarm
BY
WW
M A 7‘TORNEY
April 16, 1963
.
.S. J. HOYRUP ETAL
_
3,085,479
DEVICES FOR FORMING HEAT SEALABLE BLANKS
INTO BOX FORM AND METHOD
8 Sheets-Sheet 2
Filed July 25. 1961
IN VEN TOR.
Sigurd Johannes Hoyrup
B
YR/chara’ 1/. Pagendarm
W 4:.W
41-11» ATTORIV£Y
Aprll 16, 1963
>
3,085,479
.
-
.
S.'J.
HOYRUP
ETAL
DEVICES FOR FQRMING HEAT SEALABL E BLA-NKS
8 Sheets-Sheet 3
INTO BOX FORM AND METHO D
Filed July 25, 1961
Fig. 5
Sigurd Joha
INVENTOR
s Hay up
R hard V P
BY
4””
ndam
ATTORNEY
3,085,479
April 16, 1963
S. J. HOYRUP ETAL
v DEVICES FOR FORMING HEAT SEALABLE BLANKS
v
Filed July 25. 1961
‘INTO BOX FORM AND METHOD
'
8 Sheets-Sheet 4.
IN VEN TOR.
ohannes Hqyrup
1/. Pay en darm
M
A TTORNEY
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‘
s. JIHOYRU'P
ETAL
J
Apr‘! 16’ 1963 DEVICES, FOR FORMING HEAT SEALABLE BLANKS 3’085’479.
-
’ '
INTO BQX FORM ‘AND METHOD
-
Filed July 25, 1961
8 Sheets-Sheet 5
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BY
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.M ATTORNEY
{Puma-MA
J. HOYRUP ETA ’
AP"!' 16’ 1963 DEVICES FORs. FORMING
HEAT SEALAIELE. BLANKS '3’085’479
INTO BOX FORM'AND METHOD
Filed July 25, 1961
8 Sheets-Sheet 6
,
April 16, 1963
-
Filed July 25, 1961
.
S W OYRUP
DEVICES FOR F0
ETAL
me. HEAT SEALABL
INTO BOX FORM AND MET
v 3,085,479
BLANKS
a Sheets-Sheet 7
INVENTOR.
Sigurd Johannes ~f-laJ/r‘up
BYR/chard 1/. Pagendarm
April 16, 1963
.
‘
S. J. HOYRUP' ETAL
3,085,479
.
DEVICES FOR FORMING HEAT SEAL-‘ABLE BLANKS
Filed July 25, 1961
INTO BOX FORM AND METHOD
8 sheets_sheet 8
f_ E“
\
°°
EINVENTOR.
Sigurd Johannes Hay/‘up
YRichard M Pagendarm
\
M ATTORNEY
3,085,479
Patented Apr. 16,, 1963
2
of the die into which the blank is forced. A preheater is
arranged in advance of the die in a position in which
3 085,47 9
DEVICES non Fon’MrNo HEAT SEALABLE
the plunger grasps the blank and moves it into the die
BLANKS INTO BOX FORM AND METHGD
Sigurd Johannes Hoyrup, Monta Vista, and Richard V.
Pagendarm, San Mateo, Calif., assignors to Atlas Gen
eral Industries, Inc., New York, N.Y., a corporation of
Massachusetts
in an exceedingly short period of time, so as to preclude
cooling of the preheated blank portion which, in itself,
has a rather low heat capacity.
In order to produce the necessary time of dwell at the
preheater, the arrangement is preferably such that a blank
Filed .luly 25, 1961, Ser. No. 126,689
9 Claims. (Cl. 93--51)
This invention relates to machines for forming ?at
box blanks into box shape and heat-sealing the box corners
by attaching to certain wall panels corner ?aps hingedly
feeder moves the blank from a source of supply to the
10
extending from other wall panels, or by attaching panels
preheater where the blank remains while the feeder moves
out of the way and returns to pick up a new blank. The
plunger then engages the partially preheated blank and
forces it into the die. The latter motion involves shaping
of the blank into box form. -
>
The die is then contractedabout the plunger, or the
of corner gussets to themselves, or to wall panels.
15
plunger is expanded, in order to put the adhered blank
Heat-scalable box blanks are coated with a composition
portions under compressive force. The appropriate por
which is non-tacky at room temperatures, but becomes
tions of the die are heated by electricity or steam and the
tacky when heated, so that application of heat and pres
compression time is so chosen as to permit su?icient heat
sure produces a bond between two coated surfaces or be
penetration of non-preheated portions to produce a secure
tween a coated and a non-coated surface.
20
bond.
The paperboard from which heat-sealable boxes are
made is preferably coated with the heat sealing composi
During compression the plunger is at rest, the preferred
arrangement being one in which the remainder of the
machine continues in motion so that, for example, the
adhesive application is required during the handling of
operation of the feeder is not interrupted. A preferred
the blank in the forming machine.
25
form of mechanism for producing the requisite plunger
Box forming and heat sealing machines are known, and
dwell form the subject matter of the patent to S. J. Hoyrup,
are in use at present, in which a plurality of mandrels
tion before the blanks are cut and scored, so that no
move box blanks from one station of the box forming
No. 2,997,928, dated August 29, 1961.
’
'
Preferably, the preheater is constructed to serve the
ing, heating, compressing and other operations. Such 30 dual purpose of prefolding the blank in preparation of its
entry into the folding die and is mounted within the
machines are relatively large, expensive, and are di?’icult
stroke range of the plunger and centered with respect to
-to convert from one box size to another, since such con—
the main die. The elements of the prefolding die form
version necessitates an exchange of all the mandrels and
obstacles in the path of the blank while the blank is being
of the corresponding forming devices of the machine.
carried by the feeder, and the feeder moves the blank
A different type of machine is the plunger-and-die
past the obstacles, whereby a portion of the blank is pre
machine. Plunger-and-die machines are widely used at
folded with respect to the remainder, generally the box
present for the purpose of forming and gluelessly inter
bottom. The blank remains in contact with the prefold
locking box blanks. These machines are not difficult to
machine to another for performance of the various fold
ing elements, at least some of which are heated.
change from one box size to another, as such conversion
The heated portions of the prefolding die transfer
necessitates little more than the replacement of a plunger 40
heat to the blank, preferably to the prefolded blank por
and a forming die for one of a different size, together
tions which rest against them due to the “?ght” of the
with a replacement or adjustment of elements of the
feeder.
The present invention relates to a machine of the
plunger and die type which offers the advantage of being 45
considerably smaller in size, as Well ‘as lower in cost,
than multi~mandrel machines.
board, i.e., the fold resistance of the board at the crease
or score.
The blank may be held in the prefolding die either by
friction or by suitable detents or catches under which
the blank snaps. The plunger then engages the blank,
removes it from the prefolding into the main folding die,
thus continuing or completing the folding opera-tions.
of formed blanks is the heating of the adhesive to a tem
According to a preferred embodiment of the invention
perature sufficient to produce tackiness. If the heat is 50
the main folding die is made expansible and contractible
applied to the thermoplastic coating directly and by con
A principal difficulty encountered in the heat-sealing
tact, the coated surface tends to adhere to the heating
elements. If, on the other hand, heat is applied to the
non-coated back surface of board having a coated front
surface, a certain amount of time is required for the heat
to penetrate the board to the coating. This makes it im
by making opposite ends, or sides, movable while the
remaining ‘die sides or ends, respectively, are stationary.
possible to heat and seal simultaneously, particularly
traction of the die.
where more than two thicknesses of board are involved at
the bond area. If now the application of heat were to
The movable die portions are heated, Whereas the sta
tionary elements remain unheated. In this manner the
application of heat can be controlled by the time of con
'
Upon expansion of the die, the heated die elements
occur in the forming die into which the blank is forced
move away from the box, an air space is formed be
tween the box and the hot die elements, and the transfer
by the plunger, the blank would have to remain in the
of heat to the plunger by conduction is interrupted. This
is important as an unduly warm plunger would tend to
die for a time su?icient to permit the heat to penetrate
soften the coating of the box and cause it to stick to the
the board. This time depends on the type of adhesive,
plunger. This applies to inside coated boxes where the
the thickness of the board and other factors, but the
average amount of time is so great that the machine could 65 coating serves the double purpose of liquid or moisture
proo?ng of the box and the purpose of providing heat
not be operated successfully except at an exceedingly slow
sealable areas at the corners.
rate of the order of 15 per minute.
While the ‘compressive force of the die may be im
The present invention provides a machine capable of
parted by hydraulic means as in plunger and die type
much higher production rates. These are attained by
moving the blank into the forming die in a partially pre 70 formers for assembling glued boxes, it is preferred to
employ ShOl‘teStl‘OkG pneumatic servo—motors, particularly
heated state. Preferably those portions of the blank are
diaphragm-type actuators.
preheated which are farthest remote from the hot surface
or
3,085,479
£3
The various objects, features and advantages of the
invention will appear more fully from the detailed de
scription which follows accompanied by drawings show‘
ing, for the purpose of illustration, a preferred embodis
(it
right with respect to the bottom panel in such a manner
that the gussets are folded to the inside of the tray, as
shown more particularly in FIG. 3.
The gusset panels a and b are folded along the diagonal
fold lines, for example line 24 in FIG. 3 and, due to the
ment of the invention. The invention also resides in
certain new and original features of construction and com
difference in height of the gusset panels, the top portion
hination of elements hereinafter set forth and claimed.
of the panel I), which extends beyond the panel a, comes
Although the characteristic features of this invention
into engagement with a portion of the end panel ‘12 hav
which are believed to be novel will be particularly pointed
ing a coating of heat sealingmaterial thereon so that a
out in the claims appended hereto, the invention itself, its 10 bond is effected between a portion of the panel 11 and a
objects and advantages, and the manner in which it may
portion of the end panel, for example pmel 12, as shown
be carried out may be better under-stood by referring to
in FIG. 4. The resulting corner seal is of double ply
the following description taken in connection with the
accompanying drawings forming a part of it in which:
thickness within the upper portion and of triple ply thick
ness within the lower portion of the gusset structure.
FIG. 1 is a plan view of a representative form of blank 15
The ?nished tray A’ is shown in FIG. 2.
suited for handling on a machine embodying the inven
With the shape and the folding operation of the blank
tion;
FIG. 2 is a perspective view of a box or tray set up
from the blank of FIG. 1;
FIG. 3 is a perspective view of a box corner in the 20
process of assembly;
FIG. 4 is a sectional view of a sealed box corner, the
section being taken on line 4-4 of FIG. 2;
FIG. 5 is a perspective view of the die and feeder por
tion of a.- machine embodying the invention;
FIGS. 6, 7 and 8 illustrate the sequence of operations
in mind, it will now be easy to follow the construction and
operation of the mechanism for performing the folding
and sealing functions.
1
Referring first to FIG. 5, a main folding die isccom
posed of lateral ‘die elements 28 and 29 which in the il
lustrated form construction are ?xed, and a pair of end
die elements 30 and 31 which, in the illustrated form of
mechanism, are projectible and retractable by diaphragm
type servo-motors of which one is visible at 32. The
lateral element 29 and the end element 31 nearest the ob
server are not well visible in FIG. 5 as they are partially
FIG. 9 is a perspective view of a portion of the mecha
obstructed by other structures, but are shown in FIG. 9
nism viewed from below; and
FIG. 10 is a perspective view of a portion of the drive 30 showing the mechanism as seen from below.
Referring to FIG. 9 it is seen that the end elements 30
mechanism.
performed by the blank folding and sealing mechanism;
In the following description and in the claims various
details will be identi?ed by speci?c names for convenience.
and 31 are mounted on transverse jaws 33 and 34, re
spectively, ?tted with bushings visible at 35 and 36 and
The names, however, are intended to be generic in their
slidable on rods 37 and ‘38 ?xed within a die frame 39.
mgs.
tuator comprises a central stud 4t) pivoted to a connecting
rod ‘41 at 42. The other end of the rod is pivotally con
nected to the jaw 33 at 43. The corresponding connect
application. Corresponding reference characters refer 35 The die frame also carries the diaphragm-type servo
motors of which one is visible at 32. Its diaphragm ac
to corresponding parts in the several ?gures of the draw
The drawings accompanying, and forming part of, the
speci?cation disclose certain speci?c details of construc
tion for the purpose of explanation of ‘broader aspects 40 ing rod 44 of the opposite jaw 34 is visible in part in the
drawing and its pivotal connection to the jaw 34 may be
of the invention, but it is understood that structural de
seen at 45. It is a hollow pivot pin from which a grease
tails may be modi?ed in various respects without depar
?tting projects.
ture from the principles of the invention and that the
The end elements of the die are electrically heated,
invention may be incorporated in other structural form
?exible cables for the internally mounted heating element
than shown.
45
being visible at 46 and 47, and asbestos pads 48 and 49
The blank A shown in FIG. 1 consists of paperboard
coated on one side with a heat-scalable coating.
The
are provided between the die elements and the jaws to
reduce the conduction of heat to the jaws and the die
coating renders the board liquid- or at least moisture-proof
frame.
and, in addition, furnishes the adhesive material for sea]
Returning to FIG. 5, a prefolding die or device is
ing the box corners. The coating is applied to that side of 50
mounted centered with respect to, and in advance of, the
the board which becomes the inside of the ?nished tray
main folding and compression die. The prefolding die
and individual blanks are cut from the coated stock in the
comprises lateral prefolding elements 50 and 51, end
usual manner on conventional cutting and creasing equip
ment.
folding elements 52 and 53 and corner folding elements
The cut and scored blank A is shown in FIG. 1. It 55 54. The corner folding elements are electrically heated
and carry creasing elements 55 set at an angle of approxi
comprises a bottom panel 11 to which end panels 12 and
mately 45 degrees with respect to the die corner. Two
13 are articulated along end fold lines 14 and 15. Side
heating surfaces '56 and 57 are adapted to be contacted by
panels 16 and 17 are ‘articulated to the opposite sides of
portions of the prefolded blank, as will later be seen.
the bottom panel 11 along side fold lines 18 and 19.
Corner gussets 20, 21, 22 and 23 connect the end panels 60 Means may be provided for locking a prefolded blank
in the position in which heat is being transferred to it
and the side panels at the four corner-s of the blank.
through the surface 56 and 57 and to prevent accidental
Each ‘gusset is foldable at a diagonal fold line 24, 25, 26
and 27 subdividing the gusset structure into two panels a
removal of a prefolded blank to the top. In the illustrated
and b, panels a lying adjacent the end panels and panels
form of device the end folding elements 52 and 53 are
b llying adjacent the side panels.
provided with a lip adapted to catch the top edge of a
prefolded blank. One of these lips is visible at 52’.
It will be noted that the otherwise rectangular blank
is notched out at the four corners by removal of small
A blank feeder v62 of otherwise known construction
rectangular portions whereby the height of the panel b,
measured from fold lines 18 and 19, becomes greater
than the height of the panel a measured from the fold
lines 14 and 15. The purpose of this arangement will
presently become apparent.
comprises suction cups 63 and 64 to which a vacuum line
is connected at 58 and 59. At the four corners of the
feeder folding rules '60 and 61 point to the ends and sides,
respectively. The disposition of the folding rules with
respect to the "blank is best seen in FIG. 6.
The blank is folded into the form of a tray A’ by fold
The operation of the device thus far described is as
ing the side walls 16 and 17 upright with respect to the
follows:
bottom 11 and by folding the end panels 12 and 13' up 75
The blank feeder 62 removes a single blank from a
3,085,479‘
5
stack of blanks which may be held in the magazine of
known construction and carries it to the prefolding die.
FIG. 6 illustrates the instant at which the blank A is
being swung into a position above the prefolding die. It
is seen that the feeder 62 supports the blank along the
side-and-end fold lines and that the folding rules 60 and
61 at the corners lie above the fold lines along which the
gusset panels are articulated to the side-and-end wall
6
FIG. 9. Vertical grooves 68 in the plunger 65 provide
the necessary clearance with respect to the latches.
The ?nished box A’ may be removed from the die
by any of a number of known devices such as suction
cups, air blasts, etc. In the illustrated device the box
remains in the die until it is ejected by the box formed
during the next cycle. In order to facilitate the ejection
of the box, the center portion of the side walls are slight
panels, respectively.
ly bowed in by spring urged plungers 69 (FIG. 9) hav
surfaces 56 and 57 of the corner folding elements '54.
FIG. 8 shows the blank A after withdrawal of the feed
er 62. The blank is now at rest and heat is being imparted
spur gear on the main shaft 75 of the machine. The
spur gear and pinion are to the right of the observer
and not visible in the illustration. The main shaft 75
After reaching a position above, but centered with 10 ing rounded heads 70 extending through appropriate aper
tures in the lateral die elements 28 and 29. Correspond
respect to the prefolding die, the feeder descends. This
ing grooves 71 in the plunger provide plunger clearance
causes the blank ?rst to strike the creasing elements 55
with respect to the heads 70. The side walls are bowed
which line up with the diagonal fold lines of the gussets,
in to a dimension smaller than the corresponding dimen
whereafter the side panels and the end panels are folded
in an upward direction by engagement with the lateral 15 sion of the bottom panel 11 of the box so that the bottom
of the next box comes to rest on the bowed-in side
folding elements 50, 51 and the end folding elements 52,
walls of the last formed box and pushes it out of the die.
53 of the prefolding device.
FIG. 10 illustrates a portion of the machine drive.
FIG. 7 shows the blank at the instant at which the cups
A belt driven pulley 72 has a sprocket gear connected to
are about to release the blank, whereafter the feeder with
draws leaving the blank in the prefolding die in a posi 20 it (not visible) which drives a drive shaft 73 through a
chain 74. The shaft 73 carries a pinion meshing with a
tion in which the gusset panels a and b overlie the heating
to the surfaces about to be bonded. It is seen more par 25 performs one revolution per operating cycle and carries
a crank behind the plate 76 of the machine. The crank
ticularly that the gusset panels 12, which are two and three
oscillates a lever 77 through a link 78. The lever 77
plies removed from the exterior of the ?nished box and
has
a push rod 7? connected to it leading to a cross head‘
which would be di?icult to heat in the main die by trans
80 slidable up and down on a ?xed guide rod 81 of the
fer of heat through the several thickness of board, are
being heated by intimate contact with the heating sur 30 machine. The cross head carries a transverse bar on its
upper end to which the pneumatic plunger drive is con
faces 57 against which they are being forced due to the
nected. Details of such construction are illustrated and
fold resistance of the board.
described in the aforementioned patent to Ho-yrup.
A folding and forming plunger 65 now descends and
The main drive shaft 75 carries a cam disk 75’ on
forces the blank A from its rest position in the prefolding
which a follower 82 of an air valve 83 rides. The air
35
and preheating device into the main die with regard to
which the prefolding and preheating device is centered.
valve supplies compressed air to, and vents compressed
air from, the servo-motors through air lines 84 and 85.
It is evident that the invention may be incorporated
In the main die the blank assumes the shape A’ shown in
FIG. 2. .In order to compensate for the difference in
thickness of the gusset structures at the corners, the
plunger 65 is recessed at 66 to accommodate the third
thickness of board within the recess and to permit full
in other forms of machines and that the illustrated con
struction may be modi?ed to suit individual requirements.
compressive force to be exerted between the top portion
of the gusset panel I) and the respective end wall.
FIG. 9 shows the box A’ during the compression
phase. Compression is applied during a fraction of a
box form and sealing the box corners, the device com
prising, in combination, a preheater; a feeder for mov
ing a blank from a source of supply and depositing the
blank in a position on said preheater; a folding die
What is claimed is:
1. A device for folding a heat scalable blank into
second, the time being so selected as to permit suf?
comprising movable elements forming a contractible die
cient heating of the end panels for a satisfactory bond.
throat; means for periodically actuating said elements
The time depends, of course, on the temperature of the
to contract said die throat; means for heating said ele
compression elements 36, 31, On the thickness of the
ments; a plunger for moving a deposited blank from
board, on the heat conduction property of the board, and 50 said preheater into said folding die between said ele
the type of the adhesive used. It is determined by the
ments; and means for operating said feeder and said
experiment and may be varied by running the machine
plunger in alternating sequence.
faster or slower or by raising or lowering the temperature
2. A device for folding a heat scalable blank into
of the heating elements.
box form and sealing the box corners, the device com
During the compression the plunger 65 remains at rest.
prising, in combination, a preheater; blank retaining
Various mechanical drives are known for accomplishing
means for engaging and retaining a blank in contact
this, a preferred form of mechanism being the pneumatic
with said heater; a feeder for moving a blank from a
drive forming the subject matter of the aforementioned
source of supply to said preheater into engagement with
Hoyrup Patent No. 2,997,928. The device comprises, in
said retaining means; a folding die comprising movable
principle, a piston connected to the forming plunger and
elements forming a contractible die throat; means for
a cylinder connected to a reciprocating bar of the engine
periodically actuating said elements to contract said die
drive mechanism. At a predetermined moment the piston
throat; means for heating said elements; a plunger for
and, hence, the plunger come to rest, whereupon the
moving a blank engaged by said retaining means into
compression die is contracted to exert compressive force
said folding die between said elements; and means for
on the box. In the meantime, the drving cylinder con 65 operating said feeder and said plunger in alternating
tinues its motion for a certain distance, comes to rest,
sequence.
reverses its direction, all of which results in changes in
3. A device for folding a heat scalable blank into
the air pressure below and above the piston. As soon
box form and sealing the box corners, the device com
as the compression die is expanded and the plunger 65
prising, in combination, a main folding die comprising
is released, air pressure drives the plunger in an upward
movable elements forming a contractible die throat; a
direction out of the die.
prefolding
device in advance of said main folding die;
Means are provided for stripping the ?nished box off
means for heating said prefolding device; a feeder for
the plunger. In the illustrated device spring urged latches
67 on the lateral folding elements 28 and 29 engage the
top edge of the box.
The latches are best visible in
moving a blank from a source of supply to a point of
rest at said prefolding device in a position in which said
3,085,479
device prefolds at least a portion of the blank with re
spect to the remainder of the blank and transfers heat
to the blank; a plunger Whose stroke extends past said
prefolding device and through said ‘die for moving the
prefolded blank from said prefolding device into said
main die; means for operating said feeder and said plunger
said prefolding die to prefold at least a portion of the
blank With respect to the remainder of the blank and pre
heat at least the prefolded portion; a plunger for mov
ing the prefolded blank from said prefolding die into said
main die; and means timed with respect to said oscillat
ing means for operating said feeder and said plunger in
in alternating sequence; and means timed With respect to
alternating sequence.
said operating means for moving the ‘die elements in a
7. A device for folding a heat scalable blank into box
direction to contract the die throat.
‘form and sealing the box corners, the device comprising,
4. A device for folding a heat scalable blank into 10 in combination, a main folding unit comprising a die ele
box form and sealing the box corners, the device com
ment and a plunger element adapted to pass into the die,
prising, in combination, a preheater; a feeder for mov
one of said elements being expansible and contractible to
ing a blank from a source of supply and depositing the
exert compressive force on a folded blank between said
blank in a position on said preheater; a folding die com
elements; a prefolding die in advance of said die element;
prising a pair of opposite ?xed throat elements project 15 a feeder for moving a blank from a source of supply into
ible and retractable to vary the distance between them;
engagement with said prefolding die, said prefolding die
means for periodically moving said movable elements
being in the path of the feeder-engaged blank so as to pre
into projected position; means for heating said movable
fold a portion of the feeder-engaged blank with respect
elements; a plunger for moving a deposited blank from
to the remainder of the blank, the prefolding die being
said preheater into a position between said movable ele 20 centered with respect to the main folding die and dis
ments; and means timed With respect to said moving
posed Within the plunger stroke so that the plunger carries
means for operating said feeder and said plunger in alter
a prefolded blank from the prefolding die into the main
nating sequence.
die element; means for heating at least that portion of the
5. A device for folding a heat sealable blank into box
prefolding die which engages the prefolded blank por
form and sealing the box corners, the device comprising, 25 tion; means for heating at least one of the elements of the
in combination, a preheater; a feeder for moving a blank
main folding die which is subjected to compressive force
from a source of supply and depositing the blank in a po
by the aforesaid expansion and contraction; drive means
sition on said preheater; a folding die comprising a pair
for periodically moving said plunger into and out of said
of opposite ?xed throat elements, and a pair of opposite
die element; means timed with respect to said drive means
movable throat elements forming a substantially rectangu
for expanding and contracting the expansible and con
lar die throat with said ?xed elements; a pneumatic dia
tractible element at timed intervals; and means timed with
phragm means operatively connected to said movable
respect to said drive means for operating said feeder.
elements to contract the die throat upon application of
8. The method of setting up a carton from a blank hav
compresssed air to the said pneumatic diaphragm means;
ing portions which in the set up condition of the blank
means for periodically ‘applying compressed air to said 35 are ‘to overlie and be secured to each other by a thermo
diaphragm means; means for heating said movable ele
plastic adhesive composition pre-applied to the blank and
ments; a plunger for moving a deposited blank from said
which method comprises transporting the blank by a
preheater into a position between said movable elements;
transfer device to a folding die whereafter a plunger
and means timed with respect to the compressed air ap
moves the blank into the die to e?ect setting up thereof,
plying means for operating said feeder and said plunger 40 the method being characterized by [the step of applying
in alternating sequence.
heat to portions of the blank from the moment of deposit
6. A device for folding a heat sealable blank into box
of the blank at the die by the transfer device, and main
form and sealing the box corners, the device compris
rtaining the application of heat at least until the plunger
ing, in combination, a main folding die comprising a pair
engages the blank and moves it into the die.
of opposite ?xed ?rst throat elements, and a pair of op
9. Method according to claim 8 in which portions of
posite movable second throat elements forming a substan
the blank which are to be preheated are prefolded by the
tially rectangular die throat with said ?rst elements; means
action of the transport device moving the blank against
for oscillating said second elements to contract the die
the heating means.
throat periodically; means for heating said second ele
ments; a prefolding die in advance of said main folding 50
References Cited in the ?le of this patent
die and centered with respect to said main folding die;
UNITED STATES PATENTS
means for heating said prefolding die; a feeder for mov
ing a blank from a source of supply into engagement with
3,008,386
Mosse _; ____________ __ Nov. 14, 1961
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