Bag and method for producing the same
AssigneeWindmoeller & Hoelscher KG
InventorsRüdiger Grosse-Heitmeyer, Thomas Knoke, Martin Koelker, Ludger Schulten, Hans-Ludwig Voss, Jan Thorsten Weber, Thomas Hawighorst, Holger Frische
Life of this patent
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Abstract
A sack is formed by first transverse sealing seams from a foil tube, and is provided with at least a first vent channel, which runs largely parallel to the axis of the film tube, and whose inner film layer has first vent openings for venting of the sack interior into the first vent channel. A second vent channel is provided, which is connected to the first vent channel by second vent openings, and which, in turn, has third vent openings, which vent the at least one second vent channel.
Claims16
A sack produced from a film tube, comprising:
- an inner film layer and an outer film layer,
- at least a first vent channel and a second vent channel, the first and second vent channels being associated with a first, a second, and a third longitudinal sealing seam, the sack having a length in a direction of an axis (z) and a width in a direction of an axis (x), and the first and second vent channels extending substantially parallel to the axis (z) of the film tube,
- the inner film layer having first vent openings therein for venting an interior of the sack into the first vent channel, the first vent openings being configured as holes in the inner film layer,
- the first vent channel and the second vent channel being in communication via second vent openings for venting the first vent channel into the second vent channel, and
- the outer film layer having third vent openings therein for venting the second vent channel to an exterior of the sack, the third vent openings being configured as holes in the outer film layer,
- with the first vent openings and the third vent openings being located at substantially a same position relative to the length in the direction of the axis (z) of the sack,
- with each of the second vent openings being configured as an interruption in the second longitudinal sealing seam, the interruption being located at a treated portion of the film tube that is bond-resistant to an adhesive, the treated portion being a section of the film tube having a coating thereon, and
- with the first longitudinal sealing seam and the third longitudinal sealing seam each being without the interruptions over an entire longitudinal length of the seam.
Dependencies are inferred from the claim text.