Note: Descriptions are shown in the official language in which they were submitted.
METHOD FOR MANUFACTURING A SACK OR BAG WITH AN E~D
BEING RECTANGULAR IN THE FILLED STATE AND WITH A HANDLE,
AND A SACK OR BAG MANUFACTURED IN ACCORDANCE
WITH SAID METHOD
This invention relates to a method for manufacturing a sack
or bag with an end being rectangular in the filled state and with
a handle portion, and to sacks or bags manufactured in accordance
with said method.
Sacks or bags of thls kind are for instance known from the
German Utillty Models 81 15 909 and 82 07 889. Sald known sacks
or bags, however, show the drawback that the leg~llke strips
forming an end leaf, so to speak, which in their middle reglon
are connected with the web sectlon being provided with the
griphole, are glued to the end all over, or nearly all over, so
that through the web section, i.e. in the region of the
longitudinal centre plane runnlng through the end of the sack,
conslderable strains are exercised on the end during carrying,
said strains resulting from the fact that the forces exercised
by the web section are introduced therein substantially in the
region of a line e~tending centrically through the end square.
In order to avoid this drawback, in the German patent
application 40 12 896.2 a sack or bag is described which is
formed by side tucks partially overlapping corner tucks, and the
handle portion joined thereto consists of a middle web section
with the griphole and lateral leg-like strips of flexible
material being connected therewith, wherein the end which is
pulled open is conventionally glued or welded to a leaf connected
sealingly with the inner edges of the corner tucks and at least
with the inner edges of the side tucks adjacent to their fold
lines, wherein the handle portion is inserted in the still open
end, and the leg-like strips thereof are at least partially
covered by the side tucks and glued or welded thereto. In this
sack or bag, the side of the lateral leg-like strips of the
handle portion facing the leaf constituted by e.g. a piece of
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paper or foil, wherein said strips carry in the cen-tre thereof
the web section having the griphole, is not glued to said leaf,
but the side tucks overlap the lateral leg-like strips and are
glued or welded thereto with the sides thereof at which also the
middle web section with the griphole is located. Said sack or
bag, therefore, is characterized by a tunnel which is formed
between the lower side of the handle portion and the ou-ter side
of the leaf. Due to this design, through the middle web section
and the leg-like strips connected therewith, the carrying forces
are substantially directly introduced into the side walls of the
filled sack or bag, so that the handle portion can accept
considerably greater carrying forces without the sack being
damaged thereby or end parts being stripped thereoff.
But it has been proved to be disadvantageous that the sack
or bag described above cannot be easily and simply produced by
machines. Also the method for manufacturing a sack or bag with
a tunnel of the kind mentioned above, as described in the German
patent application P 40 14 600.6, is relatively complicated.
lt is an object of the present invention to provide a method
for manufacturing a sack or bag of the generic type by which said
sack or bag can be easily and economically produced by machines
in a production line.
Accordingly a method is disclosed for forming a sack or bag
with rectangular ends and a handle comprising the following
steps:
forming three parallel, pregrooved fold lines ex-tending
transversely to the side edges at one end of a tube piece
with side folds;
pulling open the end provided with fold lines in such a manner
that the lowermost fold line forms a centre line of the
pulled-open endi
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pasting a rectangular cover sheet provided with glue around its
circumference to the open end forming a flap at one edge of
the cover sheet by folding it in such a manner that the
fold edge lies approximately on one of the two upper
pregrooved fold linesi
applying glue to the area of the open end above one of the two
upper pregrooved fold lines, and to the flap;
folding the open end at the centre line, and gluing together the
area applied with glue and the portion of the open end
opposlte thereto; and
cutting out a grip hole by punching in the glued section between
an upper pregrooved fold line and a top edge.
A decisive advantage of this method compared with the known
method lies in the fact that the leaf to be glued thereto need
not be prefabricated. Nevertheless, in this case a so-called
tunnel bottom is obtalned automatically ln an especially simple
manner by folding together the end. The advantage of the sack
or bag manufactured according to thls method compared with bags
having handles jolned thereto, lies in the fact that the carrying
handles are directly incorporated into the end during
manufacture, so that additional work cycles like the production
of handle portions and the gluing thereof are not required.
An advantageous embodiment of the method above comprises
glulng ln handle relnforcements prior to folding together the
open end thereby increasing the carrying capacity of the handle.
In this case it is particularly advantageous that by the corner
tucks a reinforcement in the area of the formed handle portion
which is particularly subject to strain is obtained.
A sack or bag being manufactured in accordance with the
method of the invention consists preferably of a single material.
Thereby the sultablllty for recycling of -the sack or bag is
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improved. It is particularly advantageous that the sack or bag
consists of paper.
A further solution for the above defined object is given by
the method comprising the steps of:
(a~ formation of two pregrooved fold lines extending in
parallel to each other and transversely to the side edge, at one
end of a tube piece with side folds,
(b) pulling open the end in such a manner that the fold
line lying inwardly forms a centre line of the pulled-open end,
(c) gluing on two handles laterally on the pulled open end
and partially onto the inner tube wall of the tube piece,
(d) pasting in a rectangular cover sheet which is provided
with glue at the edge sections, and
(e) upward folding of the lower half of the end at the
inwardly lying fold line onto the upper half of the end.
By means of this method sacks or bags can be produced which
use a comparably very small amount of material, but which are
still of a very strong design in the handle portion.
Furthermore, there is obtained an absolute consistency despite
the fact that separate handles are incorporated within the end.
The incorporation of the handles renders possible in an
especially advantageous manner that the side walls can be printed
all over.
A preferred embodiment of the said method above results from
folding the uppermost pregrooved fold line together with the
glued edge section of the cover sheet upward by 90 to form a top
edge.
Another solution of the object is represented in the method
comprising the following steps:
(a) Formation of two pregrooved fold lines extending in
parallel to each other and transversely to the side edge, at one
end of a tube piece with side folds,
(b) cutting the outer edge portion up to the fold line in
such a manner that lobes extending in parallel to the side folds
are created,
(c) pulling open the end in such a manner that the inwardly
lying fold line forms the centre line of the pulled-open end,
(d) folding over of the outer end flaps at the fold edges
in such a manner that the flaps project outwardly,
(e) gluing two handles onto the outwardly projecting flaps
and partially onto the inner tube wall,
(f) pasting in a rectangular cover sheet which is provided
with glue in a certain Eormat at the edge sections, and
(g) upward folding of the lower half of the end at the
inwardly lying fold line onto the upper half of the end.
A sack or bag manufactured according to said method has the
advantage that it does not have upper edge sections. The formed
lobes provide a larger adhesion surface area for the handles,
whereby stability is further enhanced.
The object stated hereinabove is also solved by a method
comprising the following s-teps:
(a) Formation of two pregrooved fold lines extending in
parallel to each other and transversely to the side edge, at one
end of the tube piece with side folds,
(b) forming cuts being parallel to the side folds, which
extend up to the fold line,
(c) pulling open the end in such a manner that the inwardly
lying fold line forms the centre line of the pulled open end,
(d) insertion of cord handle pieces and gluing them to the
inner tube walls of the tube piece,
(e) folding over of the outer end flaps along the fold
edges,
(f) pasting in a rectangular cover sheet which is provided
wlth glue in a format-like manner at the edge sections, and
(g) upward folding of the lower half of the end at the
inwardly lying fold line onto the upper half of the end.
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By -this metho~ a sack or bag with so-called cord handles is
proposed which, according to an advantageous embodiment, can also
consist of the same material as the bag, in particular of paper.
The object is also solved by a method according to the
following steps:
(a) onto a continuously advanced flat web -there are glued
handle pieces laterally and spaced apart from each other,
(b) then an additional strip is supplied which is glued to
the web at an edge section of the web along a longitudinal seam,
(c) on the strip another adhesive strip is applied at the
edge at the free end of the strip,
(d) the web is Eolded to a tube, whereby side folds are
formed,
(e) the tube piece formed in said manner is provided with
two pregrooved fold lines which extend in parallel to each other
and transversely to the side folds,
(f) the end is pulled open along the inner fold line,
(g) the side edges of the end are folded over at the fold
lines,
(h) a cover sheet is glued to the covered end by means of
a glued area, and
(i) upward folding of -the lower half of the end at the
inwardly lying fold line onto the upper half of the end.
This method enables the provision of laterally joined
handles for a sack or bag.
Furthermore, the object indicated hereinbefore is also
solved by the methods according to the following steps:
(a) Formation of two pregrooved fold lines extending in
parallel to each other and transversely to the side edge, at one
end of the tube piece wi-th side folds,
(b) pulling open the end in such a manner that the inwardly
lying fold line forms the cen-tre line of the pulled open end,
whereby corner tucks are formed,
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(c) gluing on a cover sheet by means of a glued area
covering the open end at the slde of the edges, wherein a U-
shaped sheet and the end portions of a handle piece are glued
onto the cover sheet,
(d) application of a glued area onto the edge of the cover
sheet, wherein glue is also applied to the free leg of the U-
shaped sheet,
(e) upward folding of -the lower half of the end at the
inwardly lying fold edge onto the upper half of the end.
An additional method according to the invention comprises
the following steps:
(a) providing cuts arranged along a straight line on an
advanced flat web,
(b) gluing on a handle in the section of a cut such that
the end sections are glued to the web up to the cut, where the
portion of the handle projecting beyond the cut is not glued,
(c) application of glue on a la-teral edge strip of the flat
web,
(d) folding together of the bag, whereby side folds are
formed, and severing in bag length,
(e) formation of three parallel, pregrooved fold lines
extending transversely to the side folds, at the end of the tube
piece at which the handle is joined,
(f) pulling open the end in such a manner that the
lowermost fold line forms the centre line of the pulled open end,
(g) pasting in a rectangular cover sheet being provided
with glue at the circumference, at which a flap is formed by
folding such that the fold edge of the flap lies approximately
on one of the two fold lines,
(h) application of glue on the section of the end above one
of the two upper fold edges and the flap,
(i) folding of the pulled open end at the centre line and
gluing of the glued area with the opposite part of the end. -
Despite the fact that it has been indicated as being
especially advantageous that the sacks or bags manufactured
according to the invention consist of paper, it must be
emphasized that within the scope of the invention they can also
consist of any other material, in particular also of plastic.
Such plastic sacks or bags are not necessarily glued within the
scope of the invention, but can also be welded, as is a measure
belonging to prior art.
The ends still open after the filling of the sacks or bags
are sealed in any manner according to prior art.
Further details and advantages of the invention will be
explained in detail in the following by means of the embodiments
represented in the drawings. There is illustrated in
Figures 1 through 7:
the method steps of a first method according to the
invention for the manufacture of a sack or bag,
Figures 8 through 13:
a second embodiment of the method according to the invention
for the manufacture of a sack or bag,
Figures 14 through 21:
a third embodiment of the method according to the invention
for the manufacture of a sack or bag,
Figures 22 through 29:
a fourth embodiment of the method according to the invention
for the manufacture of a sack or bag,
Eigures 30 through 3~:
a fifth embodiment of the method according to the invention
for the manufacture of a sack or a bag,
Figures 38 through 46:
a sixth embodiment of the method according to the invention
for the manufacture of a sack or a bag, and
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Figures 47 through 55:
a seventh embodiment of the method according to the
invention for the manufacture of a sack or a bag.
First of all, the indlvidual method steps of the first
embodiment of the method according to the invention for the
manufacture of a sack or bag - in the present case a disposable
diaper bag with a pinch-bottom - will be described with reference
to Fig. 1 through 7.
The tube piece 1 represented in Fig. 1 is provided with side
folds 2. The tube piece 1 will be provided with three
pregroovings 3, 4, and 5 extending transversely to the side folds
2. The thus formed tube section is then pulled open along the
pregrooved edge 3. The pulled-open state of the bag is shown in
Fig. 2. Onto the end pulled open in such a manner, on the one
hand two reinforcing sheets 6 and 7 are completely glued all over
in the edge sections and, on the other hand, a cover sheet 8 is
inserted which forms an end leaf. In Fig. 3 the already inserted
end leaf is shown. Additionally, in order to show the end leaf
clearly, the end leaf is shown prior to -the insertion in a
perspective view. From said perspective it can be gathered that
the cover sheet 8 is provided with an external glued area 9 (i.e.
it is provlded with glue over a certain area in a certain
format). Said glued area does not include a flap 10 formed at
one side of the cover sheet by folding which can also be
designated as lobe. Wi-th the side provided with glue in a frame-
like form which can be inferred from said perspective detail
drawing, the cover sheet 8 is put on the open end and
correspondingly glued thereto. In Fig. 3 the flap 10 of the
glued cover sheet, which is not provided with glue, faces the
viewer.
In the method step as illustrated in Fig. 4 in the upper
part of the pulled-open sack - i.e. above the fold edge 5 - and
on the flap 10 abutting below said part, a glued area 11 is
applied thereto. Subsequently, the open end is closed by folding
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at the fold edge 3 so that the arrangement as shown in Fig. 5 is
obtained. In Fig. 6 the method step is shown in which a grip
hole 12 is cut in by punching in the area in which the
reinforcing sheets 6 and 7 lie on top of each other.
The filling of a bag prepared in said manner is carried out
at the still open end opposite the grip hole 12. After the
filling, said open end is sealed in any manner known in prior art
so that the bundle as illustrated in Fig. 7 is obtained.
By means of Figs. 8 through 13 another embodiment of the
method according to -the invention for the manufacture of a
disposable diaper bag with a kind of pinch-bottom is explained.
According to Fig. 8 it is again started with a tube piece 13 with
side folds 14, in which pregroovings 15 and 16 are provided which
extend in parallel to each other and transversely to the side
folds 14. The thus prepared tube piece is pulled open along the
pregrooved edge 16, whereby-the pulled open end according to Fig.
9 is obtained. Onto the end pulled open in said manner, prepared
handles 17 and 18 are put which, in the section of their contact,
are completely glued all over to the pulled-open end and
partially with the inner walls of the tube piece 13 (see Fig.
lC). The prepared handles 17 and 18 consist of correspondingly
folded paper strips. In accordance with Fig. 11 a cover sheet
19 is subsequently put on this end whi.ch on its side facing the
bag is provided with a frame-like allround layer of glue 20.
Subsequent to the application of the cover sheet 19, the lower
half of the end is folded upwardly onto the upper half of the end
at the pregrooved edge 16 by 180, as can be gathered from Fig.
12. The thus prepared diaper bag is then filled from below, as
it is the case in the first embodiment, and thereupon sealed in
the lower section in a known manner, whereby the bundle
represented in Fig. 13 is obtained.
By means of Figs. 14 through 21 the method according-to the
third embodiment o~ the invention can be explained. Also in this
case, as can be inferred from Fig. 14, it is proceeded from a
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tube piece 21 formed with side folds 22, which is provided with
pregroovings 23 and 29 extending transversely to the side folds
22 and in parallel to each other. As is illustrated in Fig. 15,
in a tube piece prepared in said manner at the upper edge four
cuts 25, and 26 are formed by which lobes 27 and 28 are created.
The thus prepared tube piece is then pulled open in the upper
section along the fold line 24 to form an end, which is shown in
Fig. 16. Then the upper and the lower portion of the end are
respectively folded inwards at the fold lines 23, whereby the
configuration represented in Fig. 17 is obtained, in which the
lobes 27 and 28 project outwardly. As is shown in Fig. 18,
handles 29 and 30 are put thereon afterwards which are completely
glued to the later side walls as well as to the lobes 27 and 28.
Onto the covered bu-t not yet closed end as represented in Fig.
18 there is put a cover sheet 31 which is glued to the end by
means of a format-wise area of glue 32 (Fig. 19). From Fig. 19
it can be seen that the format-wise application of glue is
omitted in the area of the handles 29 and 30 glued to the side
walls. This is necessary so that the cover sheet 31 is not glued
to the side walls, whereby a later end forma-tion would be
inhibited. Then the lower half of the end is folded at the fold
edge 24 by 180 onto the upper half, whereby the diaper bag
according to Fig. 20 is obtained. Af-ter the filling of such a
bag, the bundle shown in Fig. 21 is obtained, the bottom of which
is again closed in a known manner. Said bundle does not show any
upper edge sections extending in parallel to each other as does
the bundle according to Fig 13. Consequently, according to said
embodiment of the method there is produced an edge-free bag.
By means of Figs. 22 through 29 a further embodiment of the
method according to the invention can be described. In Fig. 22
there is again shown a tube piece 33 with side folds 34, which
at one end is provided with two fold lines 35 and 36 in the form
of pregroovings, which are parallel to each other and transverse
to the side folds. Accordlng to Fig. 23, cuts 37 are provided
which extend parallel to the side folds 34. A tube piece
prepared in said manner is then pulled open at the fold edye 36,
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as illustra-ted in Fig. 24. In the thus pulled open end, two
prepared cord handle pieces 38 are put on the inner slde walls
of the tube piece 33 and glued thereto. The cord handle pieces
38 advan-tageously also consist of paper cords which at their free
ends are glued in between two longitudinal and rectangular paper
strips. This can be gathered from Fig. 25. In the following,
as is shown in Fig. 26, -the -two end flaps are folded to the
inside at the groove edges 35, whereby it is ensured by the cuts
37 that the cords 38 need not be bent. Onto the covered end as
shown in Fig. 26 which is not yet closed, a cover sheet 39 is put
and glued to the end by a corresponding glued area 40, as can be
seen in Fig. 27. The lower half of the end is then folded at the
fold line 36 by 180 upwards onto the upper half of the end so
that a diaper bag still open at the bottom is obtained as is
represented in Fig. 28. After the filling of such a bag from
below, and after the sealing of the lower, still open bottom, the
bundle illustrated in Fig. 29 is obtained. Also for the bag
manufactured according to said embodiment of the method an edge-
free bundle is obtained which in this case is provided with
handles made of paper cords 38 ins-tead of handles made of paper
strips.
Another embodiment for the method according to the invention
is illustrated in Figs. 30 to 37. Said embodiment is an economic
method for the continuous production of diaper bags with carrying
means which are disposed in the side fold. First of all handle
pieces 42 are glued onto a continuously advanced flat web 41,
which consists e.g. of paper, on both sides spaced apart from
each other. After this has been carried out, an additional strip
43 is supplied, as can be seen in Fig. 31. Said supplied strip
43 is glued at an edge section by means of a longitudinal seam
44 with the flat web 41. Parallel to said longitudinal seam 44
the additional web 43 has another adhesive strip 45. The thus
prepared web is then folded to form a tube provided with side
folds 46 and 47 as shown in 32'. In this case, the left side
fold 47 is formed by the additional strip 43. According to Fig.
32, a tube piece formed in such a manner is pregrooved with -two
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fold lines 48 and 49 which extend in parallel to each other and
transversely to the side folds 46 and 47. Along the pregrooved
fold line 48 the end is pulled open so that the configuration
represented in Fig. 33 is obtained. Then the end is covered up
along the lines 49, which can be seen in Fig. 34, but it is still
partially open. A cover sheet 50 is glued to the covered end in
a usual manner by means of a glued area 51, as is represented in
Fig. 35. Then the lower half of the end 50 is folded upwards at
the groove edge 48 by 180 onto the upper end half, as can be
inferred from Fig. 36. After the filling of a bag prepared in
said manner, the bundle shown in Fig. 37 is obtained.
By means of Figs. 38 through 46 another embodiment of the
present invention is explained. In accordance with Fig. 38 again
two pregrooved fold lines 94 and 96 extending in parallel to each
other and transversely to the side edge are formed at one end of
a tube piece 90 w:ith side folds 92. According to Fig. 39 the end
is pulled open such that the inwardly lying fold line 96 forms
the centre line of the pulled open end, whereby corner tucks 98
are created. According to Fig. 40 a rectangular cover sheet 100
is glued thereto which has a glued area 108 similar to that of
the cover sheet 70 of the previous embodiment (see with respec-t
thereto Fig. 41). In this case, however, apart from a U-shaped
sheet 102 which in turn is glued thereto with a leg over the
width of the sheet 100, a paper handle piece 104 is glued to the
cover sheet 100, as becomes obvious from Figs. 42 and 43.
Then a glued area 110 is applied, the arrangement of which
results from Fig. 44, wherein also on the free leg of the U-
shaped sheet 102 glue is applied. Finally, the lower half of the
end is folded at the inwardly disposed fold edge 96 onto the
upper half of the end. After filling of the bag and covering of
the open side of the bag with any bottom, the bundle according
to Fig. 46 is obtained.
One last embodiment is explained by means of Figs. 47
through 55. On an advanced flat web 120 made of paper, cuts 122
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and 124 are provided which are arranged along a straight line and
the arrangement of which can be seen in Fig. 47. Then a handle
126 which consists of a folded paper strip is glued thereto in
the section of the cut 122 in such a manner that the ends are
glued with the web 120 up to cut 122, whereas the portion of the
handle 126 ju-tting out beyond cut 122 is not glued. Glue is
applied to a lateral edge strip of the flat web 120.
According to Fig. 49 the web is folded to bags under
formation of side folds 130, wherein the bags are severed in the
length of bags. This is possible in the section of the handles
126 by the fact that in said section the cuts 122 and 124 were
provided prior thereto. According to Fig. 50 three parallel,
pregrooved fold lines 132, 134, and 136, extending transversely
to the side edges, are pregrooved at the end of the tube piece
to which the handle 126 has been joined. Then, according to Fig.
51, the end is pulled open such that the lowermost fold line 132
forms the centre line of the pulled open end. According to Fig.
52, a rectangular cover sheet 138, provided with glue at its
circumference, at which a flap 140 is formed by folding, is
pasted into the end such that the fold edge of the flap 138 lies
approximately upon one of the two fold lines 136. According to
Fig. 53, the section above one of the two upper fold edges 136
and the flap 140 is provided with a glued area 144. Finally, the
open end is folded upwards at the centre line 132 and the glued
area is glued to the part of the end facing it. After filling
of the bag and seallng of the still open side with any bottom,
the bundle according to Fig. 55 ls obtained.
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