Apparatus for packaging objects

1. A method of operating a packaging apparatus for packaging food portions, having a conveying device for transporting a continuous web of a first packaging material comprising a bottom film, in a transport direction; and having a feed device for feeding a continuous web of a second packaging material comprising a top film, in the transport direction, wherein the conveying device comprises a first reception shaft for receiving a first supply roll of the first packaging material and the feed device comprises a second reception shaft for receiving a second supply roll of the second packaging material; wherein the first reception shaft can be driven by means of a first drive motor to carry out a rotational movement; and/or wherein the second reception shaft can be driven by means of a second drive motor to carry out a rotational movement, with the first and/or second drive motor being a servomotor or servomotors, wherein the following steps are carried out to determine a state parameter of the second supply roll arranged at the second reception shaft, wherein the state parameter is a diameter of the second supply roll:

coupling the webs of the first and second packaging materials;

operating the conveying device and/or the first drive motor using a predefined operating parameter to produce a movement of the web of the first packaging material;

detecting at least one movement parameter of a rotational movement of the second supply roll; and

determining the state parameter on the basis of the produced movement of the web of the first packaging material and/or on the basis of the operating parameter and of the movement parameter of the second supply roll.

2. The method in accordance with claim 1 ,

wherein the first drive motor is operated such that a predetermined mechanical strain—which is constant in time or variable in time—of the web of the first packaging material is produced; and/or wherein the second drive motor is operated such that a predetermined mechanical strain—which is constant in time or variable in time—of the web of the second packaging material is produced, and/or

wherein a transport of the web of the first packaging material takes place in a clocked manner; and/or

wherein the following steps are carried out to determine a state parameter of a supply roll arranged at the first or second reception shaft:

operating the first or second drive motor using at least one predetermined operating parameter to produce a rotational movement of the respective supply roll;

detecting at least one movement parameter of the produced rotational movement of the respective supply roll; and

determining the state parameter on the basis of the operating parameter and of the movement parameter; and/or

wherein the following steps are carried out to determine a state parameter of a second supply roll arranged at the second reception shaft:

coupling the webs of the first and second packaging materials;

operating the conveying device and/or the first drive motor using a predefined operating parameter to produce a movement of the web of the first packaging material;

detecting at least one movement parameter of a rotational movement of the second supply roll which is thereby produced; and

determining the state parameter on the basis of the produced movement of the web of the first packaging material and/or on the basis of the operating parameter and of the movement parameter of the second supply roll; and/or

wherein the following steps are carried out to determine a state parameter of a first supply roll arranged at the first reception shaft:

operating the conveying device using a predefined operating parameter to produce a movement of the web of the first packaging material;

detecting at least one movement parameter of a rotational movement of the first supply roll which is thereby produced; and

determining the state parameter on the basis of the produced movement of the web of the first packaging material and/or on the basis of the operating parameter and of the movement parameter of the first supply roll; and/or

wherein a rotational speed of the first and/or second supply roll is detected, with this detection taking place by means of at least one contacting and/or contactless sensor and/or a stretching of the web of the second packaging material is/are determined on the basis of the detected movement speed of the first and/or second web and/or on the basis of the detected rotational speed; and/or

wherein a movement speed of the web of the first packaging material and/or a movement speed of the web of the second packaging material and/or a movement speed of both webs in a coupled state is/are detected, and/or wherein a stretching of the web of the first packaging material and/or a stretching of the web of the second packaging material is/are determined on the basis of the detected movement speed of the first and/or second web and/or on the basis of the detected rotational speed.