EP0868997A2 - A device for the proper and free stacking of welded bags in a welding machine - Google Patents
A device for the proper and free stacking of welded bags in a welding machine Download PDFInfo
- Publication number
- EP0868997A2 EP0868997A2 EP98200871A EP98200871A EP0868997A2 EP 0868997 A2 EP0868997 A2 EP 0868997A2 EP 98200871 A EP98200871 A EP 98200871A EP 98200871 A EP98200871 A EP 98200871A EP 0868997 A2 EP0868997 A2 EP 0868997A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- welding
- bags
- bag
- welded
- support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/74—Auxiliary operations
- B31B70/92—Delivering
- B31B70/98—Delivering in stacks or bundles
- B31B70/984—Stacking bags on wicket pins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
Definitions
- the present invention refers to a device for the proper and free stacking of welded bags in a welding machine, in particular said device avoids sticking between the welded portions of the surfaces.
- the weld lines, or more simply the weldings, along the transverse direction (which have been executed on the bags or on the bag tubular material) are still hot when the bags are stacked together.
- said weldings, still hot get in contact with each other during the stacking phase and there is, easily, a gluing activity among the bags.
- a broken bag may not appear as such, but, when carrying a certain weight, the welding breaks and the bag content falls down.
- the alternate motion run has to be adjusted according to the changes in length of the bag which is being manufactured.
- the welding machine has to have a certain construction complexity downstream of the welding system, i.e. in the stacking support area.
- a purpose of the present invention is to find a solution that, besides solving the previously shown and outlined technical problem will realise a welding machine as simple as possible.
- Another purpose is to realise a device that avoids a complicate construction, by minimizing the masses and the elements in motion, and nonetheless able to fully reach its required working features.
- Another purpose is to reduce to the minimum all the necessary adjustments, even in presence of a very simple assembly, therefore achieving a low construction and assembly costs.
- a device for the proper and free stacking of welded bags in a welding machine wherein the welding machine comprises at least a pair of opposed rolls which feed a plastic tubular material, an upper welding device and a lower welding device which cooperate to execute the transverse welding of the plastic tubular material, a support for stacking the welded bags as they come out from the two welding devices, said support is positioned downstream of the welding devices and it carries needles on which the bags are steadily positioned by means of a small upper press, characterised in that said device comprises a driven transverse displacement element which acts on the single bag to be welded, and causes the backing of one of the free front end of the bag, said displacement element is positioned between the two welding devices and the support and it acts every second bag, in order to displace one bag from the next one.
- an embodiment is very easily obtainable since it is made of elements suitable for a simple construction and assembly, such elements are even commercially available.
- Such a device is quickly adaptable to any kind of application.
- Such a device has construction and drive advantages since it works every two bags.
- Such a device will be easier to drive and it will work at lower speeds than the previous devices.
- the drawing shows a schematic front elevation view of a device according to the invention which is applied to a welding machine for the production of welded bags, shown in its welding arrangement.
- a full line indicates an extended bag, without the intervention of the device of the present invention; meanwhile a chain (dash and dot) line indicates a bag on which an intervention is performed by the device of the present invention.
- a possible embodiment of a portion of the welding machine is shown (indicated by reference numeral 11), wherein a tubular material 12 is fed, having a flattened shape and being devoted to the bag production.
- the type of the welding machine is of no relevance for the application of this invention, since this new device is built so that it can be applied to any welding machine, even to existing and already working machines.
- the welding machine 11 generally comprises a pair of opposed rolls 13 which feed the material 12, nozzles 14 associated to such rolls to feed air in order to maintain the material fed through the rolls 13 in a flat position.
- An upper welding device 15 and a lower welding device 16 cooperate to execute the transverse welding of the tubular material and said devices have a cutting blade 17 which works between two weld lines realised by the welding devices when they engage.
- a swivel 18 is positioned downstream of the two welding devices 15 and 16 , said swivel, by means of transverse bars 19, moves downward the welded bag ends. Further downstream, a support 20 is positioned in order to stack the welded bags 21, 21' coming out from the welding devices 15 and 16. The support 20 carries needles 22 (just one is shown) whereon the bags 21, 21' are steadily positioned by means of a small upper press 23.
- the bags 21 are indicated by a full line and the bags 21' are indicated by a chain line.
- a specific device is positioned between the two welding devices 15 and 16 and the support 20 for the stacking of the welded bags 21, 21' in order to realise the proper and free stacking of welded bags in a welding machine.
- this device avoids the gluing of consecutive bags along the still hot weld lines.
- a pushing element 25 will be provided and it will be driven downward or upward, being positioned above or below a bag 21', by means of an actuator 26, as a cylinder or the like.
- the pushing element 25 pushes only the bags 21', indicated by a chain line, which have to be displaced in respect to the bags 21 which are stacked without any displacement.
- the pushing element 25, shaped as a plate or as a roll, works as a transverse displacement element of the single bag 21' to be welded, and said element 25 pushes an intermediate area of the bag and causes the backing of the free front end 27 of the bag positioned on the table 24.
- the needles 22 of the support 20 penetrate into the bag 21' in a displaced position, towards the center of the bag, in respect to the penetration area of the preceding bag 21. In this way, when the bag 21' welded also in its back free end 28, is released by the two welding devices 15 and 16, this end falls downward below the corresponding end of the preceding bag 21.
- the device according to the present invention will have to work every two bags in order to displace two consecutive bags.
Landscapes
- Making Paper Articles (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
A device for the proper and free stacking of welded
bags in a welding machine (11), wherein the welding
machine comprises at least a pair of opposed rolls
(13) which feed a plastic tubular material (12), an
upper welding device (15) and a lower welding device
(16) which cooperate to execute the transverse
welding of the plastic tubular material (12), a
support (20) for stacking the welded bags (21) as
they come out from the two welding devices (15, 16),
said support (20) is positioned downstream of the
welding devices and it carries needles (22) on which
the bags (21, 21') are steadily positioned by means
of a small upper press (23), said device comprises a
driven transverse displacement element (25) which
acts on the single bag (21') to be welded, and
causes the backing of one of the free front end (27)
of the bag, said displacement element (25) is
positioned between the two welding devices (15, 16)
and the support (20) and it acts every second bag,
in order to displace one bag from the next one (21,
21').
Description
The present invention refers to a device for the
proper and free stacking of welded bags in a welding
machine, in particular said device avoids sticking
between the welded portions of the surfaces.
In the manufacturing process of bags, obtained from
plastic tubular material or the like, welded either
at one end, the so called "open mouth" bags, or at
both ends, it has been more and more frequently used
the operation of stacking said bags, coming directly
from the welding transverse bars, on a support
provided with needles. In fact, instead of providing
transportation means to carry away the single bags,
there are provided suitable stacking supports having
needles sufficiently thin to firmly position the
just welded bags.
Currently, because of the high working speeds of the
modern welding machines for thermoplastic materials,
the weld lines, or more simply the weldings, along
the transverse direction (which have been executed
on the bags or on the bag tubular material) are
still hot when the bags are stacked together. During
said stacking phase on said needles, said weldings,
still hot, get in contact with each other during the
stacking phase and there is, easily, a gluing
activity among the bags.
This fact causes several problems to the bag users
since it is necessary to separate one bag from the
other along such glued areas.
The separation, besides causing an effective loss of
time to the final user, might cause the partial
breaking of the welding. As a consequence, the bag
or the bags involved in such gluing, even though
just locally, might not be utilised any more.
Further, a broken bag may not appear as such, but,
when carrying a certain weight, the welding breaks
and the bag content falls down.
The conclusion is that a welding machine, without a
suitable and proper solution to the problem of
accidental gluing of the bags along the transverse
weld lines, will not be sufficiently competitive.
In fact, such a machine should work at a lower rate
of production in order to allow the cooling of the
bags while they are stacked together so that they do
not stick to each other.
An alternative solution to the low production rate
has been obtained by realising a support for the
stacking of the welded bags which is movable back
and forth along the transport direction of the bags,
i.e. back and forth horizontally in relation to the
bags which are progressively welded.
This fact leads to a stacking on the needle support
with a displacement of the end edges of the bags,
i.e. a phase displacement thereof. This alternate
positioning of the edges and therefore of the
displaced transverse weld lines of one bag in
respect to the preceding one as well as the next
one, avoids the gluing between consecutive bags.
However, such a solution requests the realisation of
a special support swinging back and forth in respect
of each bag and of a special driving device able to
act whenever a bag is welded. Therefore, the support
has to follow this quick succession of operations,
even in presence of significant inertial masses.
Further, the alternate motion run has to be adjusted
according to the changes in length of the bag which
is being manufactured.
Therefore, the welding machine has to have a certain
construction complexity downstream of the welding
system, i.e. in the stacking support area.
A purpose of the present invention is to find a
solution that, besides solving the previously shown
and outlined technical problem will realise a
welding machine as simple as possible.
Another purpose is to realise a device that avoids a
complicate construction, by minimizing the masses
and the elements in motion, and nonetheless able to
fully reach its required working features.
Another purpose is to reduce to the minimum all the
necessary adjustments, even in presence of a very
simple assembly, therefore achieving a low
construction and assembly costs.
These and other purposes, according to the present
invention, are attained by a device for the proper
and free stacking of welded bags in a welding
machine, wherein the welding machine comprises at
least a pair of opposed rolls which feed a plastic
tubular material, an upper welding device and a
lower welding device which cooperate to execute the
transverse welding of the plastic tubular material,
a support for stacking the welded bags as they come
out from the two welding devices, said support is
positioned downstream of the welding devices and it
carries needles on which the bags are steadily
positioned by means of a small upper press,
characterised in that said device comprises a driven
transverse displacement element which acts on the
single bag to be welded, and causes the backing of
one of the free front end of the bag, said
displacement element is positioned between the two
welding devices and the support and it acts every
second bag, in order to displace one bag from the
next one.
By means of a device according to the present
invention, an embodiment is very easily obtainable
since it is made of elements suitable for a simple
construction and assembly, such elements are even
commercially available.
Further, such a device is quickly adaptable to any
kind of application.
Such a device has construction and drive advantages
since it works every two bags.
Such a device will be easier to drive and it will
work at lower speeds than the previous devices.
Such a device will not require very sophisticated
materials.
The functional and structural features and the
advantages of a device according to the invention
will be better understood by way of a non limiting
example, making reference to the accompanying
schematic drawing.
In fact, the drawing shows a schematic front
elevation view of a device according to the
invention which is applied to a welding machine for
the production of welded bags, shown in its welding
arrangement. In the drawing, a full line indicates
an extended bag, without the intervention of the
device of the present invention; meanwhile a chain
(dash and dot) line indicates a bag on which an
intervention is performed by the device of the
present invention.
With reference to the drawing, a possible embodiment
of a portion of the welding machine is shown
(indicated by reference numeral 11), wherein a
tubular material 12 is fed, having a flattened shape
and being devoted to the bag production.
The type of the welding machine is of no relevance
for the application of this invention, since this
new device is built so that it can be applied to any
welding machine, even to existing and already
working machines.
The welding machine 11 generally comprises a pair of
opposed rolls 13 which feed the material 12, nozzles
14 associated to such rolls to feed air in order to
maintain the material fed through the rolls 13 in a
flat position.
An upper welding device 15 and a lower welding
device 16 cooperate to execute the transverse
welding of the tubular material and said devices
have a cutting blade 17 which works between two weld
lines realised by the welding devices when they
engage.
A swivel 18 is positioned downstream of the two
welding devices 15 and 16 , said swivel, by means of
transverse bars 19, moves downward the welded bag
ends. Further downstream, a support 20 is positioned
in order to stack the welded bags 21, 21' coming out
from the welding devices 15 and 16. The support 20
carries needles 22 (just one is shown) whereon the
bags 21, 21' are steadily positioned by means of a
small upper press 23.
The bags 21 are indicated by a full line and the
bags 21' are indicated by a chain line.
Some of the bags 21, 21' lay on a table or on a
similar element 24 and some of the bags are hanged
to and dangle from the needles 22 of the support 20,
moved downward thanks also to the action of the bars
19 of the swivel 18. According to the present
invention, a specific device is positioned between
the two welding devices 15 and 16 and the support 20
for the stacking of the welded bags 21, 21' in order
to realise the proper and free stacking of welded
bags in a welding machine.
In fact, this device avoids the gluing of
consecutive bags along the still hot weld lines. In
particular, a pushing element 25 will be provided
and it will be driven downward or upward, being
positioned above or below a bag 21', by means of an
actuator 26, as a cylinder or the like. In fact, the
pushing element 25 pushes only the bags 21',
indicated by a chain line, which have to be
displaced in respect to the bags 21 which are
stacked without any displacement.
The pushing element 25, shaped as a plate or as a
roll, works as a transverse displacement element of
the single bag 21' to be welded, and said element 25
pushes an intermediate area of the bag and causes
the backing of the free front end 27 of the bag
positioned on the table 24.
The needles 22 of the support 20 penetrate into the
bag 21' in a displaced position, towards the center
of the bag, in respect to the penetration area of
the preceding bag 21. In this way, when the bag 21'
welded also in its back free end 28, is released by
the two welding devices 15 and 16, this end falls
downward below the corresponding end of the
preceding bag 21.
It is understood that the device according to the
present invention will have to work every two bags
in order to displace two consecutive bags.
According to this simple arrangement, the problem,
due to the accidental gluing along the weld lines of
two consecutive bags welded at high speed, is
solved.
It is therefore evident that, according to the
present invention, a new and innovative technical
solution to the problem of the gluing between the
weld lines of consecutive bags has been found in a
simple and easy way.
Claims (5)
- A device for the proper and free stacking of welded bags in a welding machine (11), wherein said welding machine comprises at least a pair of opposed rolls (13) which feed a plastic tubular material (12), an upper welding device (15) and a lower welding device (16) which cooperate to execute the transverse welding of the plastic tubular material (12), a support (20) for stacking the welded bags (21, 21') as they come out from the two welding devices (15, 16), such support (20) is positioned downstream of the welding devices and it carries needles (22) on which the bags (21, 21') are steadily positioned by means of a small upper press (23), characterised in that said device comprises a driven transverse displacement element (25) which acts on the single bag (21') to be welded, and causes the backing of one of the free front end (27) of the bag, said displacement element (25) is positioned between the two welding devices (15, 16) and the support (20) and it acts every second bag, in order to displace one bag from the next one (21, 21').
- A device according to claim 1, characterised in that said displacement element is a pushing element (25), driven by a corresponding actuator (26).
- A device according to claim 1, characterised in that close to said displacement element (25) there is a swivel device (18) which, by means of transverse bars (19) moves downward the welded back ends (28) of said bags (21, 21').
- A device according to claim 1, characterised in that said transverse displacement element (25) is movable upward.
- A device according to claim 1, characterised in that said transverse displacement element (25) is movable downward.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI970674 | 1997-03-24 | ||
| IT97MI000674A IT1290812B1 (en) | 1997-03-24 | 1997-03-24 | DEVICE TO FAVOR THE CORRECT AND FREE STACKING OF WELDED BAGS IN A WELDING MACHINE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0868997A2 true EP0868997A2 (en) | 1998-10-07 |
| EP0868997A3 EP0868997A3 (en) | 1999-12-29 |
| EP0868997B1 EP0868997B1 (en) | 2002-06-19 |
Family
ID=11376577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98200871A Expired - Lifetime EP0868997B1 (en) | 1997-03-24 | 1998-03-20 | A device for the proper and free stacking of welded bags in a welding machine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0868997B1 (en) |
| DE (1) | DE69806083T2 (en) |
| IT (1) | IT1290812B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6440581B1 (en) * | 1999-09-29 | 2002-08-27 | Elba S.P.A. | Performance welding bar |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2428599A1 (en) * | 1978-06-12 | 1980-01-11 | Lagain Georges | Plastics bag forming machine - has strip folded over roller and spot welded together on sloping table |
| DE4102877A1 (en) * | 1991-01-31 | 1992-08-06 | Windmoeller & Hoelscher | Device for forming stack of bags from tube of thermoplastic - uses row of spikes with roughened ends, with roughening achieved by circumferential grooves |
| US5312317A (en) * | 1991-11-28 | 1994-05-17 | Windmoller & Holscher | Apparatus for detaching pieces of tube provided with transverse weld seams from a web and for stacking the same |
-
1997
- 1997-03-24 IT IT97MI000674A patent/IT1290812B1/en active IP Right Grant
-
1998
- 1998-03-20 DE DE69806083T patent/DE69806083T2/en not_active Expired - Fee Related
- 1998-03-20 EP EP98200871A patent/EP0868997B1/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2428599A1 (en) * | 1978-06-12 | 1980-01-11 | Lagain Georges | Plastics bag forming machine - has strip folded over roller and spot welded together on sloping table |
| DE4102877A1 (en) * | 1991-01-31 | 1992-08-06 | Windmoeller & Hoelscher | Device for forming stack of bags from tube of thermoplastic - uses row of spikes with roughened ends, with roughening achieved by circumferential grooves |
| US5312317A (en) * | 1991-11-28 | 1994-05-17 | Windmoller & Holscher | Apparatus for detaching pieces of tube provided with transverse weld seams from a web and for stacking the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6440581B1 (en) * | 1999-09-29 | 2002-08-27 | Elba S.P.A. | Performance welding bar |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69806083T2 (en) | 2003-01-16 |
| EP0868997B1 (en) | 2002-06-19 |
| EP0868997A3 (en) | 1999-12-29 |
| ITMI970674A1 (en) | 1998-09-24 |
| DE69806083D1 (en) | 2002-07-25 |
| IT1290812B1 (en) | 1998-12-11 |
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