Air-tight longitudinal sealing seam for thin films

:

• A method for producing a sealing seam which joins two film sides, the method comprising:
• performing a pre-sealing process comprising:
• heating at least one film side of the two film sides, and
• in a heated state of the at least one film side, bringing both of the two film sides into contact with one another so as to form a pre-sealing seam which joins the two film sides together as a film;
• and
• performing a final sealing process comprising:
• supplying the pre-sealing seam at a transport speed to a pressing device which is arranged downstream of the pre-sealing process, and
• applying a force via the pressing device to at least one film side of the two film sides along the pre-sealing seam substantially perpendicular to the transport direction so as to transform the pre-sealing seam into a final sealing seam which is substantially impermeable to air.

:

• A device for producing a sealing seam which air-tightly joins two film sides, the device comprising:
• a pre-sealing apparatus which comprises a heating device;
• and
• a final sealing device which is arranged downstream of the pre-sealing apparatus in a transport direction of the two film sides, the final sealing device comprising a pressing device which is configured to provide a force,
• wherein,
• the pre sealing apparatus is configured to perform a pre-sealing process comprising:
• heating at least one film side of the two film sides in a pre-sealing process via the heating device of the pre-sealing apparatus, and
• in a heated state of the at least one film side, bringing both of the two film sides into contact with one another so as to form a pre-sealing seam which joins the two film sides together as a film, and the final sealing device is configured to perform a final sealing process comprising:
• supplying the pre-sealing seam at the transport speed to the pressing device which is arranged downstream of the pre-sealing process, and
• applying the force via the pressing device to at least one film side of the two film sides along the pre-sealing seam substantially perpendicular to the transport direction so as to transform the pre-sealing seam into a final sealing seam which is air-tight.

:

• An air-tight film packaging comprising:
• at least the air-tight sealing seam as recited in claim 31 which is configured to seal a film tube along one side;
• and
• two air-tight transverse seals.

:

• A combination packaging comprising:
• the inner air-tight film packaging as recited in claim 32;
• and
• an outer packaging which surrounds the inner air-tight film packaging,
• wherein,
• an intermediate space between the outer packaging and the inner air-tight film packaging is unfumigated.

:

• A combination packaging for a foodstuff, the combination packaging comprising:
• an inner air-tight film packaging;
• and
• an outer packaging which surrounds the inner air-tight film packaging,
• wherein,
• an intermediate space between the outer packaging and the inner air-tight film packaging is unfumigated, and
• the inner air-tight film packaging comprises a smooth, homogeneous longitudinal sealing seam.