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Патент USA US2122061

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June 28, 1938.
E. Hoppg,
Filed Sept. 21', 1954
s Sheets-Sheet 1
1C1. 3
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(Z) L='-‘L—— ____________ -__r-:.
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~ Edgar Hoppe
muunwm, age OF
Filed Sept. 21,. 1954.
3 Sheets-Shee't 2
Edgar Hoppe
Patented June 28, 1938
Edgar Hoppe, Amsterdam, Netherlands,
New York, N. Y.,
to St. Regis Paper Company,
a corporation of Delaware .
Application September 21, 1934, Serlal No. 744,959
In Germany April 21, 1934
‘7 Claims. (Cl. 229-55)
This invention relates to pasted end bags, but
particularly to multl-ply bags of paper, or similar
increase the advantages offered by stepped bags ‘
material, in which one or both ends are closed
by arranging opposite plies in stepped formation
5 and adhesively connecting these plies together.
Existing methods of forming such bags differ
from each other mainly in the cutting of the
ends of the separate bags. In case of one of the
known methods the separate inside layers project
10 in‘ a step-like manner over the outside layers, or
on the contrary, they are shorter than the out
side layers also in a stepped order.
Another method of manufacturing bags, which
side edge of a longitudinal step to such an extent
that it partly or even completely covers the Cl
opposite step of the next layer. When folded in
this manner two or more steps of the opposite
side arecovered whereby eventually the next to
the outside following edge does not need at all
to cover the opposite edge of the corresponding 10
‘layer or to be pasted with it.
It has been found advantageous to make two
or more steps of the one longitudinal side equally
in comparison to the above mentioned method
15 represents a considerable improvement, provides
longitudinal edges stepped on one side flap on
the inside and on the opposite side flap on the
outside. The folded end ?aps of the individual
tubes in this case are of equal length, i. e. they
go are not stepped.
All known methods provide, ‘however, that the
- steps at the bag ends, lying opposite ,to each
other, are of equal width with respect to each
other, so that when forming the bag bottom by
25 folding the side flaps, the free part of each sep
arate longitudinal edge is placed on the free
part of the opposite longitudinal edge of the
same tube and pasted together.
This separate interpasting, at least of the lon
30 gitudinal edges of each individual tube, was here
tofore considered absolutely necessary in order
to obtain a secure and strong closure.
method requires, however, precision and accuracy
in regard to laying the individual layers one
35 to‘ the other before they are formed into tubes.
However, it is a simple matter-for the paper layers
to shift with reference to each other during the
formation of the tubes, so that the steps do not
For example, it is possible to lengthen the in
has been found, however, that the pasting
40 ofIteach
longitudinal edge individually with the
opposite lonigtudinal edge of. the same tube is
not so important in regard to the strength of the
closure as it was considered previously, and that
45 it is not essential to make the steps of the indi
vidual paper plies or ‘individual tubes absolutely
equal to one [another in case that it is to be
stepped at all. Furthermore, it has been found
that deviation from the usual way of forming
long so that they cover one another completely
and only the inner edges project over and are
pasted to one or more of the opposite longitudinal
edges. The above mentioned examples have only
the purpose of showing that the width of the
steps or the relation of the widths of the steps to I
each other can be actually varied to a large ex 20
tent without diminishing the advantages of the
stepped bag. It will be understood that upon
separating a bag length from the bag tube; the
difference in the width of the steps always pro
duces a corresponding formation of steps in re
verse direction in the following bag length.
The strength of the bag closure produced by
the above described method can be still increased
by interpasting the.single tubes at their ends
either throughout the whole or part of their cir
cumference, thereby completely abandoning the
principle of absolute independence of the longi
tudinal edges or that of the side flaps from each
other, according to the old manufacturing
This pasting may be accomplished before the
bag tube is formed and is especially important
if two steps completely overlap each other, i.‘ e.
one inner step extends up to or over the height
of the following step.
To suit the purpose the 40
individual tubes preferably are pasted together
in such case not only at the side flaps, but also
at the end ?aps. The last measure has proved
especially important in case of bag closures with
unstepped side flaps.
By pasting together the single paper webs be
fore the formation of the tube, a further advan
tage is gained, namely that the individual paper
‘webs remain secure in their relative position to
one another.
The above advantage makes the 60
50 this kind of a bag even obtains a stronger pasting
application of this measure especially advisable
of the bag bottom.
It is possible, therefore, to give different widths
to the opposite individual steps and achieve a
in case of bags, which are formed by tubes with
considerable simpli?cation of the manufacturing
5‘ process and at the same time to retain and even
equal sized steps.
By further developing the idea of pasting the
individual paper webs together, the invention pro 55
poses in case of stepped. bags of the described
kind, and mainly in case of bags provided with
side ?aps, which together with side flaps folded
individual paper webs. The application of the
above described idea is, however, not restricted
only to the bass with stepped longitudinal edges
over t em are used on one side of the bag for and unstepped side ?aps, but also is applicable
the formation of the valve, to eliminate the fre; to such bags, which are not stepped at all, i. ‘e.
quent trouble of the folded ?aps fallingout rather the individual tubes of which are cut in their
short, if no special precaution is taken, and there
whole circumference equally and only the side
fore exposed to the danger of being blown out of
the bag when it is filled. This danger is elimi
10 nated according to the invention in such way
that besides the pasting together of the ?aps the
back side of the flap which at folding forms the
innermost flap, is pasted to the stepped side flaps
insofar as it touches them. The strength of the
15 valves is thus increased to a considerable extent.
In many cases it is desirable to lengthen the’
?aps are separated from the part forming the
longitudinal edges by cuts and on the other hand
also to bags stepped all round as well as to single 10
ply bags of the annexed drawings which illustrate
for example some of the described bag forms and
which are comprehensible without further ex- -
Fig. 1a is a plan view showing an unfolded clo 15
sure forming part of the bag having stepped side
valve ?ap in order to secure a still more reliable ‘ ?aps, the steps of which are unsymmetrical on
closure of the valve. In order to attain this.
‘ _
opposite sides being separated from the folded end
it has been proposed to provide a special elonga
flaps by a longitudinal cut.
20 tion of the valve ?ap, formed at the folding which
' Figure 1b is a view similar to Fig. 1a showing 20
is afterwards pasted in. The same result is at
one side flap folded along the line g-h.
tained according to the invention bythe manu
Figure 2a is a plan view of a bag end similar ,
facturing method described below in a much sim -to that shown in Fig. 10., but having the ?ap
pler and more advantageous manner and with
elongated on the side forming a valve ?ap.
25 out additional consumption of’ material and waste
- Figure 2b is a plan view of a bag end similar to 26
' by separation of‘ single bag lengths from each ' Fig. 2a except that the plies are not stepped.
other in a new Way.
In the manufacture of these bags the separa
tion of single bag lengths from the preformed
so bag tube,is effected after the stepped part of the
flaps has been separated from one another either
by perforation or by cutting through before the
perforation of the tube, then cutting the portions
of the ready made tube which lie at its edges and
.35 form the unstepped side ?aps, and then consecu
' tive tearing of the perforation.
To enable this kind of separation it is necessary
to transfer those parts of the above mentioned
pre-cut paper web, which are still unweakened
until ?nal cutting takes place, to the outer edges.
.It is advisable to transfer also the longitudinal
glued seams of the tubes to the unstepped parts
of the web.
The lengthening of the valve is‘ attained in
, such way that the outer parts of the tube form
ing the flaps are cut on the one side of the bag
tube at a di?erent level from the other side or
Figs. ?a'ancl 3b are plan views of a portion -
of a bag tube length showing the cutting lines for
effecting the valve ?ap shown in Figs. 2a and 2b. ‘
Fig. 4 shows the shape of the ends of the un
folded individual tubes of a three wall bag with 3.0.
an elongate valve ?ap.‘
In the forms of the invention shown on the
drawings, it is of no importance whether thebag
is provided with gussets or not, or whether it is an
open mouth bag or a valve bag, with the exception
of such improvements, which refer to the valve
or its formation.
The Figures la. and 1b‘ demonstrate the differ
ent widths of the opposed sets of helps I, 2, 3 of a
three-wall bag'tube, and the overlapping of ion
gitudinal edges, after the side ?aps 4 and 5, which
latter are of equal width, have been folded in
In the upper part of Fig. la the visible steps of -
the longitudinal edges i, ‘2 and 3, and in the lower
part of the ?gure the invisible steps outlined with
from the middle level of the steps, and in such dashed lines and marked with ?gures in paren- ‘
way that the flaps on the side provided for the theses are shown; also steps (2) and (8). covered
formation of the valve are longer than on the by the innermost longest step (i). After fold- .
other side. This means that the corresponding ing the lower side flap inwardly along the folding
out is displaced with reference to the level of line (g-h), the several longitudinal edges of the ' 1 ‘
the other and results in a corresponding shorten
plies are rendered visible, the innermost-step ( i) v
ing of the adjoining ?ap in the following bag being disposed below and the steps (2) and (3)
56 length. This is, however. of no disadvantage, being disposed over the step ( i). If the side flapv
since the valve is formed anyway only on one shown in the upper part of the ?gure is folded
side of the bag and for the formation of a simple inwardly along the line (i-Jc), it is clear that
bag closure without a valve shortened ?aps are the wider step (i) comes to lie over the steps ‘i
su?lcient, especially if besides the usual pasting and 2 of the opposite side and even partly covers
60 they are pasted like the valve ?aps also along the step (3). In order to show the separation
their inner sides with the longitudinal edges.
lines the lines of the single steps are marked a~b, 60
The cut separating the valve ?ap from the ion
e-f, the lines resulting after folding the
gitudinal edges is made deeper than the level of 0-42 and
are marked (it-4i), (c-d) and (6-4).
the shortest step of the longitudinal ?aps, which steps
The Figures 2a and 2b are comprehensible‘?
85 enables lengthening of the valve ?ap at least
further explanation and'show only the 6.5
up to the heightofthe longest step. The sur
face of contact between the longitudinal edge picture, which would result if from both side‘ ?aps
d and 5 the flap intended for the formation of the
and the valve ?ap is thereby substantiallyv en
(?ap 5) is elongated. The measure of‘ the
larged and the safety of-the valve closure, espe
70 cially when pasting these parts in the aforemené additional lengthening 5a attained by means of
the above described cutting of the valve ?aps, is
tioned manner, considerably increased.
indicated by dashed lines. Of course, in case of
The ?nal result is that by these means consid
arable lengthening of the valve flap is attained
which allows a proper valve formation in the
7.5 case of wholly or partly interpasted edges of the
a bag bottom of an entirely unstepped bag shown ,
on Figure 21),, only the upper layer of the unfolded
closure, 1. e. the inner layer of the side flaps is
In the unseparated bagtube shown on Figs. 3a
and 3b, the separating lines are indicated by the
reference numerals 6, ‘I and 8. 9 are cutting lines
lying in the middle level, near the outer edge on
the side not intended for valve formation, and
III are cutting lines shifted from the middle lev
el on the side intended for‘valve formation, both
lines extending longitudinally of the bag tube. It
will be seen that the cutting lines ll extending
10 longitudinally of the bag tube and separating the
end ?aps from the side ?aps extend up to the
» level of the shortest step.
Fig. 4 shows the cutting of the ends of the un
folded individual tubes of a three-wall bag, the
hered seams, said seams all terminating in end
?aps as distinguished from side flaps, and a valve
in the end of said. bag opposed to said seams.
4. A multi-ply bag having an end closure con
sisting of side‘ flaps and end ?aps separated by
cuts running longitudinally of the bag, said side
?aps having their longitudinal edges arranged in
stepped relation on opposite sides, the lengths of
the corresponding steps transversely of the bag
on the opposed side ?aps being different, the end 10
?ap on one end being longer than the other end
?ap, the longer end ?ap, being inside of and free
from adjacent‘ ?aps to form a valve, and means
for securing the side ?aps together.
5. A multi-ply bag having an end closure con 16
of side ?aps and end ?aps separated by
The valve flap is indicated at 5, only one layer
15 steps of the side ?aps being marked I, 2 and l.
being seen. On this ?ap are marked with dotted '
cuts running longitudinally of the bag, said side
?aps having their longitudinal edges arranged in
lines the planes 12, which come to lie against- the
relation on opposite sides, a step on one 20
side flaps and are pasted to them when the valve stepped
side overlapping more than one step on the other
‘side, the lengths of the corresponding steps on
14 and I5 lie as described above in the unstepped
opposed side. naps being diiferent, and means for
part of the bag, i. e., these seams terminate in securing the side ?aps together.
the end flaps as distinguished from side ?aps. 6. A multi-ply bag having an end closure con
Of course, the invention is not restricted to the sisting of side flaps and end ?aps separated by 25
26 above described or to the fund bags illustrated cuts running longitudinally of the bag, said side
in the drawings, but can be changed in various flaps being materially more extensive than the
respects without departing from the spirit of the end ?aps and having their longitudinal edges ar
invention, especially as de?ned in the appended.._ ranged in stepped relation on opposite sides, the
step on one side substantially‘ throughout its 30
What is claimed:
length overlapping more than one step on the
1. A multi-ply bag having an end closure con
sisting of side flaps and end ?aps, said side ?aps other side at the ends of said edges, and the under
. being materially more extensive than the end surface of each step of one side ?ap engaging one
or another step of the opposite side ?ap, the end 35
?aps and having their longitudinal edges ar
ranged in stepped relation on opposite sides, a flap on one end being longer than the “other end
step on one side substantially throughout its ?ap, the longer end ?ap being inside of and free
length overlapping more than one step on the from adjacent flaps to form a valve, and means
to secure the side ?aps together.
other‘side at the ends of said edges, and the un
7. A multi-ply. bag having the plies formed 40
dersurface of each step of one side flap engaging
one or another step of the opposite side flap, and from sheets united by longitudinally adhered
seams, an end closure consisting of side flaps and
means to secure the side flaps together.
2. A multi-ply bag having an end closure con
end flaps, said seams all terminating in said end
sisting of side ?aps‘and end ?aps, said side naps flaps, said side flaps having their longitudinal
having their longitudinal edges arranged in edges arranged in stepped relation on opposite 45
stepped relation on opposite sides, the lengths of sides, the lengths of the corresponding steps
the corresponding steps transversely of the bag transversely of the bag on the opposed side flaps
on the opposed side flaps being different, and being diilerent, and means to secure the side
means for securing the side ?aps together.
3. Multi-ply satchel bottom bag having the piles flaps together.
formed from sheets united by longitudinal ad
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