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EP-4739592-A1 - PLASTIC TUBE FOR PRODUCING PACKAGING CONTAINERS HAVING INTEGRATED VENTILATION

EP4739592A1EP 4739592 A1EP4739592 A1EP 4739592A1EP-4739592-A1

Abstract

The invention relates to a plastic tube (10) for producing packaging containers (12), in particular form-fill-seal bags, comprising: i) a shaped flat film (14), wherein the lateral edges of the flat film (14) which extend in the longitudinal direction (L) are arranged so as to overlap and are integrally bonded to one another along a first longitudinal seam (16), and ii) an infeed strip (18) which is located on the inner face of the plastic tube (10) and runs in the longitudinal direction (L), wherein: the infeed strip (18) is integrally bonded to the flat film (14) via a second longitudinal seam (20) and a third longitudinal seam (22) so that a ventilation channel (24) is formed which is spaced from the first first longitudinal seam (16) along the circumference of the plastic tube (10); the plastic tube (10) comprises multiple filling areas (26) which are located one behind the other in the longitudinal direction (L) and which are provided so that one packaging container (12) can be produced from each filling area (26); in relation to a filling area (26): x) the infeed strip (18) has one or more fluid-permeable first ventilation openings (28), and y) the flat film (14) has multiple fluid-permeable second ventilation openings (30) having a predetermined size; and the first ventilation openings (28) and the second ventilation openings (30) are each located in predetermined portions of the filling area.

Inventors

  • DIETZ, Manoel
  • HÜGING, Klaus
  • FELDKÄMPER, Christoph
  • BECKER-GRÖNING, Matthias

Assignees

  • W. Gröning GmbH & Co.KG

Dates

Publication Date
20260513
Application Date
20240704

Claims (10)

  1. 1. Plastic hose (10) for producing packaging containers (12), in particular FFS bags, comprising: i) a shaped flat film (14), wherein the side edges of the flat film (14) running in the longitudinal direction (L) are arranged to overlap to form the plastic hose (10) and are connected to one another in a material-locking manner along a first longitudinal seam (16), and ii) an inlet strip (18) arranged on the inside of the plastic hose (10) and running in the longitudinal direction (L), wherein the inlet strip (18) is connected to the flat film (14) in a material-locking manner by a second longitudinal seam (20) and a third longitudinal seam (22), so that the flat film (14) and the inlet strip (18) form a ventilation channel (24), wherein the ventilation channel (24) is spaced apart from the first longitudinal seam (16) along the circumference of the plastic hose (10). wherein the plastic hose (10) comprises a plurality of filling regions (26) arranged one behind the other along the longitudinal direction (L), wherein the filling regions (26) are provided so that a packaging container (12) can be produced from each filling region (26), wherein with respect to a filling region (26): x) the inlet strip (18) comprises one or more fluid-permeable first vent openings (28) through which a gas from the interior of the plastic hose (10) can enter the vent channel (24), and y) the flat film (14) comprises a plurality of fluid-permeable second vent openings (30) through which a gas from the interior of the vent channel (24) can exit, wherein the one or more first vent openings (28) are, with respect to the longitudinal direction (L), in the central section region between 0.2*L F and 0.8*L F are arranged, wherein the second vent openings (30) are arranged in the lower section range from 0.02*LF to 0.2*LF and/or in the upper section range from 0.8*LF to 0.98*LF with respect to the longitudinal direction (L), wherein LF is the length of the filling region (26) along the longitudinal direction (L), wherein the second vent openings (30) have a quotient di/dB in the range from 1 to 5, wherein di. is the maximum diameter of the second vent openings (30) and dß is the diameter in the direction orthogonal to the maximum diameter, wherein di. is 150 pm or less.
  2. 2. Plastic hose (10) according to claim 1, wherein the venting channel (24) extends at least over the length of the filling areas (26) on the inside of the plastic hose (10).
  3. 3. Plastic hose (10) according to one of claims 1 or 2, wherein the venting channel (24) is spaced apart from the first longitudinal seam (16) by 0.3*U or more along the circumference of the plastic hose (10), where U is the mean circumference of the plastic hose (10), wherein the venting channel (24) is preferably arranged in the quadrant opposite the first longitudinal seam (16) with respect to the circumference of the plastic hose (10).
  4. 4. Plastic hose (10) according to one of claims 1 to 3, wherein the vent channel (24) is divided into two or more sub-segments connected to one another in a fluid-conducting manner by one or more further longitudinal seams and/or transverse seams.
  5. 5. Plastic hose (10) according to one of claims 1 to 4, wherein the one or more first vent openings (28) are selected from the Group consisting of ventilation slots, wherein the ventilation slots enclose an angle in the range of 80 to 90° with the longitudinal direction (L).
  6. 6. Plastic hose (10) according to one of claims 1 to 5, wherein the one or more first vent openings (28) have a quotient qi/qB in the range from 1 to 50, where qi is the maximum diameter of the first vent openings (28) and qe is the diameter in the direction orthogonal to the maximum diameter, and/or wherein the second vent openings (30) have a quotient di/dß in the range from 1 to 4.5.
  7. 7. Plastic hose (10) according to one of claims 1 to 6, wherein all first vent openings (28) of the filling region (26) are arranged in a ventilation section, wherein the ventilation section has an area in the range from 0.001*A z to 0.5*A z , wherein A z is the surface of the inlet strip (18) facing into the interior of the vent channel (24), and/or wherein all second vent openings (30) of the filling region (26) are arranged in one or two vent sections, wherein the vent section or sections each have an area in the range from 0.001*AF to 0.5*AF, wherein AF is the surface of the flat film (14) facing into the interior of the vent channel (24).
  8. 8. Plastic hose (10) according to one of claims 1 to 7, wherein di. is 125 pm or less.
  9. 9. Filled packaging container (12), in particular FFS bag, preferably producible from a plastic tube (10) according to one of claims 1 to 8, comprising: I) a shaped flat film (14), wherein the side edges of the flat film (14) are arranged in an overlapping manner and are connected to one another in a material-locking manner along a first longitudinal seam (16), wherein the flat film (14) is glued to the top of the container to form an interior space packaging container (12) along a first transverse seam (32) and at the bottom of the packaging container (12) along a second transverse seam (34) by a material-locking connection, II) an inlet strip (18) arranged on the inside of the packaging container (12) and running in the longitudinal direction (L), wherein the inlet strip (18) is integrally connected to the flat film (14) by a second longitudinal seam (20) and a third longitudinal seam (22), so that the flat film (14) and the inlet strip (18) form a vent channel (24), wherein the vent channel (24) is spaced apart from the first longitudinal seam (16) along the circumference of the packaging container (12), wherein the vent channel (24) is closed on the top of the packaging container (12) by the first transverse seam (32) and on the bottom of the packaging container (12) by the second transverse seam (34), and III) a packaging material arranged in the container interior, wherein, with respect to the packaging container (12): x) the inlet strip (18) has one or more fluid-permeable first Ventilation openings (28) through which a gas from the Container interior can enter the vent channel (24), and y) the flat film (14) has a plurality of fluid-permeable second Ventilation openings (30) through which a gas can escape from the interior of the ventilation channel (24), wherein the one or more first ventilation openings (28) are arranged in the central section region between 0.2*LF and 0.8*LF with respect to the longitudinal direction (L), wherein the second ventilation openings (30) are arranged in the lower section region from 0.02*L F to 0.2*L F with respect to the longitudinal direction (L) and/or in the upper section range from 0.8*LF to 0.98*LF, where LF is the length of the formed flat film (14) along the longitudinal direction (L) from the first transverse seam (32) to the second transverse seam (34), wherein the second vent openings (30) have a quotient di/dB in the range from 1 to 5, where di_ is the maximum diameter and dß is the diameter in the direction orthogonal to the maximum diameter, where di. is 150 pm or less.
  10. 10. Filled packaging container (12) according to claim 9, wherein the first transverse seam (32) and the second transverse seam (34) extend over the entire width of the plastic hose (10) forms a continuous, fluid-tight connection to the flat film (14).

Description

Plastic hose for the production of packaging containers with integrated ventilation Description The invention relates to a plastic tube for producing packaging containers, in particular FFS bags, and a corresponding filled packaging container. Also disclosed is a method for producing a filled packaging container according to the invention from a plastic tube according to the invention. Plastics are now frequently used in the packaging industry due to their diverse and usually precisely adjustable properties. Plastic tubes for the manufacture of packaging containers are particularly characterized by the fact that they can be produced cost-efficiently, have a low weight, are stable and tear-resistant and can usually be made fluid-tight. A product in a packaging container made from a plastic tube is therefore optimally protected against moisture and the ingress of solids from the outside. However, the fluid-tightness of plastic hoses regularly leads to problems with packaging containers made from plastic hoses. When a packaging container is filled with a filling material, especially when it is filled with bulk materials such as fertilizers, granules, food or building materials, unwanted air pockets often form in the sealed packaging container. When the filled packaging containers are stacked, for example on pallets, Such air inclusions greatly increase the risk of the plastic tube forming the packaging container bursting or tearing. The packaging industry has therefore developed various concepts for venting packaging containers made from plastic tubes, which are intended to enable venting that prevents the contents from escaping. In the prior art, for example, plastic packaging is known which allows ventilation via a ventilation channel. Ventilation is achieved here via the overlap area which often arises during the manufacture of plastic hoses and which is usually fixed with a longitudinal seam to form plastic hoses from plastic films. The overlap area can be used to create a ventilation channel, i.e. a two-layer layer which enables the packaging container to be ventilated in two stages, for example through ventilation openings. A ventilation solution designed in this way offers the particular advantage that the overlap area is in most cases arranged on the back of packaging containers. In this respect, a print image applied to the front, which in practice is usually printed on the packaging container for labeling or advertising purposes, is not visually impaired by the longitudinal seam or the ventilation channel. When venting via the back of packaging containers, however, it is often seen as a disadvantage that additional work steps are usually required to ensure sufficient venting of the packaging goods contained therein. After filling, filled packaging containers are regularly placed on the back for further transport or storage, so that a venting channel arranged there is compressed by the weight of the packaging goods. Venting is usually not possible or only inadequately possible in this way. It is therefore usually necessary to first place the packaging containers on the front, carry out the venting manually, for example using pressure, and turn the packaging containers over again after venting has taken place. This In practice, labor- and time-intensive handling is often perceived as a disadvantage. As an alternative, concepts for venting packaging containers via the seams have been proposed, in particular via seam interruptions in the transverse seam. Venting via the transverse seam, i.e. one or both of the seams that are applied transversely to the longitudinal direction of the plastic tube when manufacturing packaging containers from plastic tubes, has the advantage, particularly in combination with a venting area arranged on the top side via an inlet strip, that good venting is possible without the need to turn the packaging containers over as described above. Corresponding packaging containers are disclosed, for example, in EP 3052396 A1. However, when venting via the cross seam, it is sometimes perceived as a disadvantage that the pressure equalization in the packaging container often leads to the contents of the packaging container or individual particles of this contents, in particular dust, escaping from the seam breaks. In practice, this dusting of contents often leads to external contamination of the packaging containers and to a working environment polluted with fine dust. The primary object of the present invention was to eliminate or at least reduce the disadvantages of the prior art. In particular, it was the object of the present invention to provide a plastic hose for producing packaging containers with a ventilation channel, which should enable particularly efficient ventilation of the packaging container. It was also an object of the present invention to provide a filled packaging container which should enable particularly efficient venting of filling goods arranged inside, in part