Method for producing packages, an apparatus and a kit of parts

1 . A method for producing packages holding a food product, said method comprising

providing a web of packaging material comprising at least an outer protective layer, a cellulose-based mid-layer and an inner protective layer,

providing a protective strip,

heating a first longitudinal edge section of an inside surface of the web by applying a first flow of heated air via a first nozzle,

heating a first longitudinal edge section of an outside surface of the protective strip by applying a second flow of heated air via a second nozzle, the second flow of heated air being different from the first flow of heated air,

attaching the outside surface of the first longitudinal edge section of the protective strip onto the inside surface of the first longitudinal edge section of the web,

forming a tube of the web of packaging material by directing the first longitudinal edge section of the web inside a second longitudinal edge section of the web,

attaching an outside surface of the first longitudinal edge section of the web onto an inside surface of the second longitudinal edge section of the web,

attaching an inside surface of a second longitudinal section of the protective strip onto an outside surface of a mid-section of the web, wherein the mid-section of the web is placed between the first and second edge sections of the web, thereby providing for that the food product is hindered from coming into contact with the cellulose-based mid-layer of the packaging material,

filling the food product into the tube,

sealing the tube transversally in transversal sealing sections in a lower end of the tube, and

cutting the tube in the transversal sealing sections such that the packages are formed,

wherein the first flow of heated air has a first temperature, and the second flow of heated air has a second temperature, wherein the first temperature is adjusted in accordance with properties of the packaging material, and the second temperature is adjusted in accordance with properties of the protective strip, and

wherein the first and second temperatures are set based on measured humidity level, measured pressure and/or measured temperature in surrounding air.

2 . The method according to claim 1 , wherein the first temperature is in the range 50 to 90 degrees Celsius and/or the second temperature is in the range 70 to 250 degrees Celsius.

3 . The method according to claim 1 , wherein the first flow of heated air provided via the first nozzle is directed in a first flow direction and the second flow of heated air provided via the second nozzle is directed in a second flow direction, and the first and second flow directions are diverted at least 90 degrees.

4 . The method according to claim 1 , wherein the first flow of heated air has a first volumetric flow rate, and the second flow of heated air has a second volumetric flow rate, wherein the first volumetric flow rate is adjusted in accordance with properties of the packaging material, and the second volumetric flow rate is adjusted in accordance with properties of the protective strip.

5 . The method according to claim 4 , wherein the web of packaging material further comprising a barrier layer arranged between the outer protective layer and the inner protective layer, wherein the barrier layer provides for that oxygen is hindered from passing through the packaging material into the food product, wherein the first temperature of the first flow and/or the first volumetric flow rate are adjusted such that negative impact on the packaging material and the barrier layer is prevented.

6 . The method according to claim 4 , wherein the first and second volumetric flow rate are set based on measured humidity level, measured pressure and/or measured temperature in surrounding air.

7 . An apparatus for producing packages holding a food product, said apparatus comprising

a web holder arranged to hold a web of packaging material comprising at least an outer protective layer, a cellulose-based mid-layer and an inner protective layer,

a protective strip holder arranged to hold a protective strip,

an air heating arrangement comprising a first nozzle and a second nozzle, wherein the first nozzle is arranged to heat a first longitudinal edge section of an inside surface of the web by applying a first flow of heated air, and the second nozzle is arranged to heat a first longitudinal edge section of an outside surface of the protective strip by applying a second flow of heated air via a second nozzle, the second flow of heated air being different from the first flow of heated air,

a first strip application arrangement arranged to attach the outside surface of the first longitudinal edge section of the protective strip onto the inside surface of the first longitudinal edge section of the web,

a tube forming arrangement arranged to form a tube of the web of packaging material by directing the first longitudinal edge section of the web inside a second longitudinal edge section of the web,

a longitudinal sealing arrangement arranged to seal the web longitudinally by attaching an outside surface of the first longitudinal edge section of the web onto an inside surface of the second longitudinal edge section of the web,

a second strip application arrangement arranged to attach an inside surface of a second longitudinal edge section of the protective strip onto an outside surface of a mid-section of the web, wherein the mid-section of the web is placed between the first and second edge sections of the web, thereby providing for that the food product is restrained from coming into contact with the cellulose-based mid-layer of the packaging material,

a food product pipe arranged to fill the food product into the tube,

a transversal sealing arrangement arranged to seal the tube transversally in transversal sealing sections in a lower end of the tube, and to cut the tube in the transversal sealing sections such that the packages are formed,

wherein the first flow of heated air has a first temperature, and the second flow of heated air has a second temperature, wherein the first temperature is adjusted in accordance with properties of the packaging material, and the second temperature is adjusted in accordance with properties of the protective strip,

wherein the first and second temperature are set based on measured humidity level, measured pressure and/or measured temperature in surrounding air.

8 . The apparatus according to claim 7 , wherein the first flow of heated air provided via the first nozzle is directed in a first flow direction and the second flow of heated air provided via the second nozzle is directed in a second flow direction, and the first and second flow directions are diverted at least 90 degrees.

9 . The apparatus according to claim 7 , wherein the first flow of heated air has a first volumetric flow rate, and the second flow of heated air has a second volumetric flow rate, wherein the first volumetric flow rate is adjusted in accordance with properties of the packaging material, and the second volumetric flow rate is adjusted in accordance with properties of the protective strip.

10 . The apparatus according to claim 9 , wherein the web of packaging material further comprising a barrier layer arranged between the outer protective layer and the inner protective layer, wherein the barrier layer provides for that oxygen is hindered from passing through the packaging material into the food product, wherein the first temperature of the first flow and/or the first volumetric flow rate are adjusted such that negative impact on the packaging material and the barrier layer is prevented.

11 . The apparatus according to claim 9 , wherein the first and second volumetric flow rate are set based on measured humidity level in surrounding air, measured pressure and/or measured temperature in surrounding air.

12 . A kit of parts arranged to be mounted onto an existing filling machine, said existing filling machine comprising

a web holder arranged to hold a web of packaging material comprising at least an outer protective layer, a cellulose-based mid-layer and an inner protective layer,

a protective strip holder arranged to hold a protective strip,

a first strip application arrangement arranged to attach an outside surface of a first longitudinal edge section of the protective strip onto an inside surface of a first longitudinal edge section of the web,

a tube forming arrangement arranged to form a tube of the web of packaging material by directing the first longitudinal edge section of the web inside a second longitudinal edge section of the web,

a longitudinal sealing arrangement arranged to seal the web longitudinally by attaching an outside surface of the first longitudinal edge section of the web onto an inside surface of the second longitudinal edge section of the web,

a second strip application arrangement arranged to attach an inside surface of a second longitudinal edge section of the protective strip onto an outside surface of a mid-section of the web, wherein the mid-section of the web is placed between the first and second edge sections of the web, thereby providing for that the food product is restrained from coming into contact with the cellulose-based mid-layer of the packaging material,

a food product pipe arranged to fill the food product into the tube,

a transversal sealing arrangement arranged to seal the tube transversally in transversal sealing sections in a lower end of the tube, and to cut the tube in the transversal sealing sections such that the packages are formed, and

said kit of parts comprising

an air heating arrangement comprising a first nozzle and a second nozzle, wherein the first nozzle is arranged to heat the first longitudinal edge section of the inside surface of the web by applying a first flow of heated air, and the second nozzle is arranged to heat a first longitudinal edge section of an outside surface of the protective strip by applying a second flow of heated air via the second nozzle, the second flow of heated air being different from the first flow of heated air,

wherein the first flow of heated air has a first temperature, and the second flow of heated air has a second temperature, wherein the first temperature is adjusted in accordance with properties of the packaging material, and the second temperature is adjusted in accordance with properties of the protective strip,

wherein the first and second temperature are set based on measured humidity level, measured pressure and/or measured temperature in surrounding air.

13 . A method for preparing a web of packaging material and a protective strip before attaching these to each other, said method comprising

receiving protective strip material data,

determining a first temperature and/or a first volumetric flow rate based on the protective strip material data,

controlling an air heating arrangement to expose the protective strip to a first flow of heated air via a first nozzle, wherein the first flow has the first temperature and/or the first volumetric flow rate,

receiving packaging material data,

determining a second temperature and/or a second volumetric flow rate based on the packaging material data, and

controlling the air heating arrangement to expose the web to a second flow of heated air via a second nozzle, wherein the second flow has the second temperature and/or the second volumetric flow rate.

14 . A method for producing packages holding a food product, said method comprising

providing a web of packaging material comprising at least an outer protective layer, a cellulose-based mid-layer and an inner protective layer,

providing a protective strip,

heating a first longitudinal edge section of an inside surface of the web by applying a first flow of heated air via a first nozzle,

heating a first longitudinal edge section of an outside surface of the protective strip by applying a second flow of heated air via a second nozzle, the second flow of heated air being different from the first flow of heated air,

attaching the outside surface of the first longitudinal edge section of the protective strip onto the inside surface of the first longitudinal edge section of the web,

forming a tube of the web of packaging material by directing the first longitudinal edge section of the web inside a second longitudinal edge section of the web,

attaching an outside surface of the first longitudinal edge section of the web onto an inside surface of the second longitudinal edge section of the web,

attaching an inside surface of a second longitudinal section of the protective strip onto an outside surface of a mid-section of the web, wherein the mid-section of the web is placed between the first and second edge sections of the web, thereby providing for that the food product is hindered from coming into contact with the cellulose-based mid-layer of the packaging material,

filling the food product into the tube,

sealing the tube transversally in transversal sealing sections in a lower end of the tube, and

cutting the tube in the transversal sealing sections such that the packages are formed,

wherein the first flow of heated air has a first volumetric flow rate, and the second flow of heated air has a second volumetric flow rate, wherein the first volumetric flow rate is adjusted in accordance with properties of the packaging material, and the second volumetric flow rate is adjusted in accordance with properties of the protective strip, and

wherein the first and second volumetric flow rate are set based on measured humidity level, measured pressure and/or measured temperature in surrounding air.

15 . An apparatus for producing packages holding a food product, said apparatus comprising

a web holder arranged to hold a web of packaging material comprising at least an outer protective layer, a cellulose-based mid-layer and an inner protective layer,

a protective strip holder arranged to hold a protective strip,

an air heating arrangement comprising a first nozzle and a second nozzle, wherein the first nozzle is arranged to heat a first longitudinal edge section of an inside surface of the web by applying a first flow of heated air, and the second nozzle is arranged to heat a first longitudinal edge section of an outside surface of the protective strip by applying a second flow of heated air via a second nozzle, the second flow of heated air being different from the first flow of heated air,

a first strip application arrangement arranged to attach the outside surface of the first longitudinal edge section of the protective strip onto the inside surface of the first longitudinal edge section of the web,

a tube forming arrangement arranged to form a tube of the web of packaging material by directing the first longitudinal edge section of the web inside a second longitudinal edge section of the web,

a longitudinal sealing arrangement arranged to seal the web longitudinally by attaching an outside surface of the first longitudinal edge section of the web onto an inside surface of the second longitudinal edge section of the web,

a second strip application arrangement arranged to attach an inside surface of a second longitudinal edge section of the protective strip onto an outside surface of a mid-section of the web, wherein the mid-section of the web is placed between the first and second edge sections of the web, thereby providing for that the food product is restrained from coming into contact with the cellulose-based mid-layer of the packaging material,

a food product pipe arranged to fill the food product into the tube,

a transversal sealing arrangement arranged to seal the tube transversally in transversal sealing sections in a lower end of the tube, and to cut the tube in the transversal sealing sections such that the packages are formed,

wherein the first flow of heated air has a first volumetric flow rate, and the second flow of heated air has a second volumetric flow rate, wherein the first volumetric flow rate is adjusted in accordance with properties of the packaging material, and the second volumetric flow rate is adjusted in accordance with properties of the protective strip, and

wherein the first and second volumetric flow rate are set based on measured humidity level, measured pressure and/or measured temperature in surrounding air.