U.S. patent application number 12/226123 was filed with the patent office on 2009-05-14 for packaging for bulk goods, particularly bag made of plastic film.
This patent application is currently assigned to Nordfolien GmbH. Invention is credited to Ulla Heckmann, Michael Kreymborg.
Application Number | 20090123094 12/226123 |
Document ID | / |
Family ID | 38293127 |
Filed Date | 2009-05-14 |
United States Patent
Application |
20090123094 |
Kind Code |
A1 |
Kreymborg; Michael ; et
al. |
May 14, 2009 |
Packaging for Bulk Goods, Particularly Bag Made of Plastic Film
Abstract
Disclosed is a packaging (1) for bulk material, especially a bag
made of plastic film, comprising a packaging wall (2) which
envelops the bulk material and is provided with at least one
multilayered wall area (6) that is composed of at least one inner
layer (7) and at least one outer layer (8). Each layer has at least
one air-permeable planar piece (9). At least one conducting element
(12) for the air flow that penetrates the air-permeable planar
pieces is disposed between the inner layer (7) and the outer layer
(8). The conducting element (12) is embodied as at least one
section of an airtight intermediate layer which is arranged such
that at least the air-permeable planar pieces (9) of the inner
layer (7) and/or the outer layer (8) are covered.
Inventors: |
Kreymborg; Michael; (Damme,
DE) ; Heckmann; Ulla; (Steinfeld, DE) |
Correspondence
Address: |
COLLARD & ROE, P.C.
1077 NORTHERN BOULEVARD
ROSLYN
NY
11576
US
|
Assignee: |
Nordfolien GmbH
|
Family ID: |
38293127 |
Appl. No.: |
12/226123 |
Filed: |
March 30, 2007 |
PCT Filed: |
March 30, 2007 |
PCT NO: |
PCT/DE2007/000583 |
371 Date: |
October 8, 2008 |
Current U.S.
Class: |
383/103 ;
383/109 |
Current CPC
Class: |
B65D 33/01 20130101 |
Class at
Publication: |
383/103 ;
383/109 |
International
Class: |
B65D 33/01 20060101
B65D033/01 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 12, 2006 |
DE |
10 2006 017 229.9 |
Claims
1: Packaging for bulk goods, particularly bag made of plastic film,
having a packaging wall that sheathes the bulk goods, which wall
has at least one wall region configured in multiple layers, made of
at least one inner layer and at least one outer layer, whereby each
layer has at least one air-permeable planar piece, wherein at least
one guide organ for the air stream that passes through the
air-permeable planar pieces (9) is disposed between the inner layer
(7, 19, 27) and the outer layer (8, 21, 29).
2: Packaging according to claim 1, wherein the guide organ is at
least one section of an air-impermeable intermediate layer (12, 20,
30), which is disposed in such a manner that at least the
air-permeable planar pieces (9) of the inner layer (7, 19, 27)
and/or of the outer layer (8, 21, 29) are covered.
3: Packaging according to claim 1, wherein the guide organ is
formed by a folded-down edge of a flat web that forms the packaging
wall (2), folded in the longitudinal direction.
4: Packaging according to claim 1, wherein the guide organ is a
separate film strip that runs between the layers (27, 29) of the
multi-layer wall region (26), in the longitudinal direction of the
packaging.
5: Packaging according to claim 4, wherein pre-determined partial
surfaces of the guide organ are connected, at least in sections,
with at least one of the layers (27, 29) of the multi-layer wall
region (26).
6: Packaging according to claim 3, wherein the packaging wall (2)
is a folded flat web, whose edge regions, which overlap one
another, form the multi-layer wall region (6).
7: Packaging according to claim 4, wherein the inner layer (27) of
the multi-layer wall region (26) is formed by means of a material
strip that is disposed in the interior region of the packaging.
8: Packaging according to claim 1, wherein the guide organ is
formed from a part of a folded film strip (18) that is disposed on
the outside or inside of a film tube that forms the packaging wall
(16), running in the longitudinal direction of the packaging, in
order to form the multi-layer wall region (17).
9: Packaging according to claim 1, wherein the packaging wall has
perforations (10) in the air-permeable planar pieces (9).
10: Packaging according to claim 1, wherein at least one spacer is
disposed at least in partial regions of the air-permeable planar
pieces (9) of each layer (7, 8, 19, 21, 27, 29) and/or of the guide
organ.
11: Packaging according to claim 1, wherein each spacer is
configured as an embossing (13) made in the layers (7, 8, 19, 21,
27, 29) and/or the guide organ.
Description
[0001] The invention relates to a packaging for bulk goods,
particularly a bag made of plastic film, having a packaging wall
that sheathes the bulk goods, and at least one wall region
configured in multiple layers, made of at least one inner layer and
at least one outer layer, whereby each layer has at least one
air-permeable planar piece.
[0002] Known packagings are sacks or bags made of a film,
particularly a plastic film, which serve to wrap widely different
kinds of bulk or filled goods, such as cement, fertilizer, or
similar products, which are produced in the construction materials
industry or the chemical industry, for example.
[0003] During the filling process of known packagings, a
corresponding proportion of air gets into the interior of the
packaging along with the filled goods, thereby causing an excess
pressure to occur on the inside of the packaging wall. In order to
prevent that the packaging wall is damaged and/or might tear open
as a result of the excess pressure that is applied to the inside,
or that palleting is made more difficult as the result of the air
cushion enclosed in the interior of the packaging, sufficient
ventilation from the packaging interior must always be assured. In
EP 444 261, a packaging is described that is particularly used for
accommodating filled goods in the form of fine dust. The known
packaging has a two-layer region provided with perforations, for
ventilation, by way of which the excess pressure prevailing in the
interior of the packaging can be reduced. If the perforations of
the inner and outer wall are disposed so that they cover one
another, solid particles of the filled goods can also exit, along
with the escaping air stream. The exit of smaller solid particles,
in the form of dust, from the packaging, can be prevented by using
a filter that is disposed in the two-layer region of the packaging.
However, the use of filter material always means increased cost
expenditure, and, at the same time, a more complicated design
configuration of the packaging.
[0004] The invention is based on the task of improving a packaging
of the aforementioned type, in such a manner that not only a
simplified design configuration but also optimal ventilation are
guaranteed, and, at the same time, the filled material is prevented
from escaping in the form of dust.
[0005] The solution for this task is accomplished, according to the
invention, by means of a packaging for bulk goods having the
characteristics of claim 1. Advantageous further developments and
embodiments of the invention are indicated in the dependent
claims.
[0006] In the case of a packaging for bulk goods, particularly bag
made of plastic film, having a packaging wall that sheathes the
bulk goods, which wall has at least one wall region configured in
multiple layers, made of at least one inner layer and at least one
outer layer, whereby each layer has at least one air-permeable
planar piece, it is provided, according to the invention, that at
least one guide organ for the air stream that passes through the
air-permeable planar pieces is disposed between the inner layer and
the outer layer.
[0007] The guide organ disposed according to the invention
influences the flow of the air escaping from the packaging
interior, so that a straight-line, i.e. direct air passage through
the wall region of the packaging wall that is configured in
multiple layers, and the related exit of solid particles of the
filled goods in the packaging are advantageously prevented. The
great change, i.e. deflection of the flow of the escaping air
stream brings about the result of almost complete precipitation of
the solid particles out of the air stream that passes through the
wall region configured in multiple layers, because of the greater
mass inertia of the solid particles. For example, it is possible
that multiple guide organs, disposed interlaced relative to one
another, are present in the wall region configured in multiple
layers, forming regions that overlap one another.
[0008] According to a first advantageous further development of the
invention, it is provided that the guide organ is at least one
section of an air-impermeable intermediate layer, which is disposed
in such a manner that at least the air-permeable planar pieces of
the inner layer and/or of the outer layer are covered by the
intermediate layer. Each section of the air-impermeable
intermediate layer, which can be a film, for example, furthermore
also serves as a baffle surface or precipitation organ for the
solid particles carried out with the escaping air stream. As a
result of the intermediate layer, which projects into the air
stream, and the related deflection of the air stream, areas with
stronger flow, i.e. turbulences, and areas with weaker flow are
formed in the multi-layer wall region. Particularly in the regions
with a reduced flow velocity, the kinetic energy of the air stream
is no longer sufficient to carry the solid particles along, because
of their mass. A major portion of the solid, i.e. dust particles
therefore settles primarily in the areas of the multi-layer wall
region that have a weaker flow. The air stream, which is thereby
almost completely freed of solid particles, exits into the
surroundings by way of the air-permeable planar pieces of the outer
layer, after it has flowed around the intermediate layer.
Furthermore, the penetration of moisture from the outside into the
interior of the packaging is advantageously made more difficult by
the intermediate layer, which covers the air-permeable planar
pieces of the inner and outer layer.
[0009] The guide organ is preferably formed by a folded-down edge
of a flat web that forms the packaging wall, folded in the
longitudinal direction. The guide organ is therefore part of the
packaging wall, and folding down the edge region of the flat web
allows the creation, in advantageously simple manner, of such a
guide organ, disposed between the layers of the multi-layer wall
region. The guide organ, which preferably extends continuously in
the longitudinal direction of the packaging, guarantees optimal
coverage of the air-permeable planar pieces of the inner and outer
layer of the multi-layer wall region, which are disposed congruent
to one another, if possible.
[0010] It is also possible that the guide organ is configured as a
film strip disposed separately between the inner and outer layer of
the wall region configured in multiple layers. Such film strips can
advantageously be disposed extending both in sections and over the
entire length of the wall region configured in a double layer,
between the inner and outer layer. Using a gluing method, for
example, the film strip can then be fixed in place on at least one
of the layers of the multi-layer wall region, by way of one of its
longitudinal sides.
[0011] It is furthermore provided that pre-determined partial
surfaces of the guide organ are connected, at least in sections,
with at least one of the layers of the multi-layer wall region. By
way of such a connection, according to the invention, between
corresponding partial surfaces of the guide organ and a layer, in
each instance, the guide organ can be fixed in place, in
advantageously simple manner, in the multi-layer wall region.
Furthermore, in this way, two longitudinal sides around which the
air stream can flow can be formed on the guide organ, so that
improved ventilation during filling of the packaging is
advantageously guaranteed. Preferably, a material-fit connection
can be provided both between the inner layer and the related
partial surfaces of the guide organ, in each instance, and between
the outer layer and the related partial surfaces of the guide
organ, in each instance.
[0012] The packaging wall is a folded flat web, whose edge regions,
which overlap one another, form a multi-layer wall region. Simple
production of the packaging wall that accommodates the filled goods
is made possible by means of the folded flat web. The layers of the
multi-layer wall region, produced by means of the edge regions that
overlap one another, can be fixed in place relative to one another,
in a desired arrangement, by means of a material-fit connection
such as welding and/or gluing, for example. At the same time,
sufficient strength is provided in the connection region of the
packaging wall, by way of the material fit, so that the excess
pressure that occurs in the packaging interior during the filling
process can advantageously be absorbed over the entire packaging
wall, without causing impairments. For example, it is also possible
to produce the packaging wall from a film tube produced by means of
extrusion blow-molding.
[0013] Furthermore, the inner layer of the multi-layer wall region
can be formed by means of a material strip that is disposed in the
interior region of the packaging. The production of the packaging
is further simplified by disposing the material strip, which
particularly extends in the longitudinal direction of the
packaging, on the inside of the packaging, particularly one formed
from a flat web. In this connection, the material strip completely
covers the guide organ, formed as a film strip, for example, and
can be connected with the packaging wall by means of a glue
connection or weld connection, in each instance, over its entire
length, in the region of the two side edges.
[0014] According to a further development of the invention, the
possibility alternatively exists that the guide organ is formed
from a part of a folded film strip that is disposed on the outside
or inside of a film tube that forms the packaging wall, running in
the longitudinal direction of the packaging, in order to form the
multi-layer wall region. A separate film strip, folded in such a
manner, can be produced using a simple production process, such as
plastic extrusion, for example. Furthermore, the film strip
produced, whose other part forms the outer or inner layer of the
multi-layer wall region, in each instance, can be permanently
connected with the film tube by means of a joining method, such as
gluing or welding, for example, in advantageously simple manner. A
material-fit connection, for example configured as a glued
connection, can serve to form a firm connection between film tube
and film strip. It is possible, for example, to use a film strip
produced from plastic film as a guide organ, which strip is brought
into a connection with a film tube, also produced from plastic
film.
[0015] Each packaging wall has perforations in the air-permeable
planar pieces, which are preferably configured as rows of circular
holes and/or slits in the inner and outer layer, respectively.
Using the perforations, a simple design configuration of an
air-permeable planar piece is provided, whereby the perforations
are made in the packaging wall, which is preferably configured as a
plastic film, by way of corresponding needling or cutting tools. In
this connection, the perforations can have different dimensions in
the inner and outer layer of the packaging wall.
[0016] At least one spacer is disposed at least in partial regions
of the air-permeable planar pieces of each layer and/or of the
guide organ. Each spacer additionally improves the escape of the
air that got into the packaging along with the filled goods, from
the packaging interior. The spacers are preferably disposed between
the guide organ configured as an intermediate layer, and an
adjacent layer, in each instance, so that adhesion forces between
the adjacent surfaces of the guide organ and the layers cannot
occur. Such attraction forces can prevent passage of the air
stream.
[0017] According to a further development of the invention, each
spacer can be configured as an embossing made in the layers and/or
the guide organ. The embossings, preferably formed in the
longitudinal direction of the packaging, in the multi-layer wall
region of the packaging wall, create an advantageously simple
possibility for maintaining a distance between two film webs that
touch one another, for example. The plastic and permanent
deformation of the layers required for the production of an
embossing can take place in advantageously simple manner, by means
of embossing tools. The embossings can be made both in sections and
continuously, in partial regions of a flat web, for example, which
can be used to form the packaging wall.
[0018] Exemplary embodiments of the packaging according to the
invention, from which additional inventive characteristics are
evident, are shown in the drawing. This shows:
[0019] FIG. 1: a perspective view of a first exemplary embodiment
of a packaging according to the invention;
[0020] FIG. 2: a view of the first exemplary embodiment according
to FIG. 1 in cross-section, and
[0021] FIG. 3: a view of a second exemplary embodiment of a
packaging according to the invention, in cross-section, and
[0022] FIG. 4: a view of another exemplary embodiment of a
packaging, in cross-section.
[0023] FIG. 1 shows side-fold bag 1, whose packaging wall 2 can be
closed off, with material fit, both in the bottom region 3 and in
the head region 4, particularly by means of a weld 5, 5'. The
packaging wall 2 has a wall region 6 configured with multiple
layers (FIG. 2), which is formed from an inner layer 7 and an outer
layer 8. The inner layer 7 and the outer layer 8 have an
air-permeable planar piece 9, in the longitudinal direction of the
packaging, in each instance. The air-permeability of the layers 7,
8 is guaranteed by means of 10 perforations made in them as holes,
which allows exit of the air that got into the packaging interior
11 during the filling process. So that solid particles of the bulk
goods filled in do not exit from the packaging interior together
with the escaping air stream, an intermediate layer 12 is disposed
between the layers 7, 8 of the wall region 6 configured in multiple
layers. The intermediate layer 12 takes over the function of a
guide organ for the escaping air stream, and, at the same time, a
precipitation organ for the solid particles of the filled goods
entrained in the air stream. In order to prevent occlusion of the
perforations 10 in the layers 7, 8, as the result of adhesion
forces that might be in effect between the layers 7, 8 and the
intermediate layer 12, spacers configured as embossings 13 are
disposed in predetermined partial regions of the layers 7, 8. By
means of the perforation 10 and the embossings 13, which are
preferably configured together in a planar piece of a layer 7, 8,
in each instance, optimal ventilation of the packaging interior 11
is guaranteed at all times.
[0024] FIG. 2 shows the cross-section of the bag 1 according to the
invention, according to FIG. 1, and is specifically intended to
illustrate its structure. The packaging wall 2 is particularly
produced from a material web that has been laid together, the edge
regions of which form the overlap region having the multi-layer
wall region 6. The intermediate layer 12, which is disposed between
the inner layer 7 and the outer layer 8, is formed from a
folded-down edge of the material web that forms the packaging wall
2. In order to be able to firmly connect the folded material web,
particularly the edge regions, with one another in the overlap
region, multiple material-fit connections 14, 14' are provided in
the multi-layer wall region 6.
[0025] Another exemplary embodiment of a bag 15 according to the
invention is shown in the cross-section of FIG. 3. In this
connection, the packaging wall 16 is formed from a tubular film
produced by means of an extrusion method, on which film a separate,
folded film strip 18 is disposed, on its outside, in the
longitudinal direction of the packaging to form the multi-layer
wall region 17. The multi-layer wall region 17 produced in this way
again has an inner layer 19, an intermediate layer 20, an outer
layer 21, whereby the intermediate layer 20 and the outer layer 21
are parts of the film strip 18, and the inner layer 19 is part of
the tubular film that forms the packaging wall 16. In order to
guarantee a firm connection between the folded film strip 18 and
the packaging wall 16 configured as a film tube, material-fit
connections 22, 22' are formed between film strip 18 and packaging
wall 16; these can be produced, for example, by means of a welding
or gluing process. Of course, the inner layer 19 and the outer
layer 21 of the bag 15, like the bag 1 in FIG. 1, also have
perforations and embossings for ventilation; for the sake of
simplicity, these are not shown.
[0026] FIG. 4 shows another possible embodiment of a bag 23, which
is shown in cross-section, in order to makes its structure clear.
The packaging wall 24 is produced from a flat web that has been
laid together, the edges of which are connected with one another by
way of a material-fit connection 25. To form the multi-layer wall
region 26, a material web has been applied to the inside of the
packaging wall 24, and forms the inner layer 27 of the bag. A firm
connection between the inner layer 27, which is configured as a
material strip, and the packaging wall 24 is assured by way of the
material-fit connections 28, 28'. An intermediate layer 30
configured as a separate film strip is introduced between the inner
layer 27 and the outer layer 29, and the air stream that passes
through the multi-layer wall region flows around it. In this
connection, the intermediate layer 30 is attached to the layers 27,
29 of the multi-layer wall region, with predetermined partial
regions, by way of the material-fit connections 31, 31', in such a
manner that the intermediate layer forms two longitudinal sides
around which the air stream flows.
* * * * *