Tetra Pak International Ab

Ab Profor

Anders Sundberg

Sven-Arne Andersson

Peter Giacomelli

Means acting upon the flow, such as pumps or valves are used inter alia in the handling of liquid foodstuffs, e.g. milk, in packing machines. Since the demands on hygiene in this context are very high, especially if the packing machine operates with foodstuff sterilized beforehand, it is a disadvantage that manoeuvering devices for the means acting upon the flow have to pass from the outside into the sterile flow path where the means is located. This is avoided in accordance with the invention in that the means (3) acting upon the flow is combined with an actuator (8) which can be acted upon electromagnetically by a stator (7) isolated from the flow path.

Unit apt to act upon the flow

A method for regulating the supply of energy to a sealing device for the sealing of thermoplastic material includes supplying electric energy to a sealing device pressed against the combined thermoplastic material with whose help the said electric energy is converted to thermal energy. The amount of energy supplied to the sealing device is variable to compensate for heat losses brought about by heat leakage during the sealing opertion. An arrangement for carrying out the method is also disclosed.

Method for regulating the energy supply to a sealing device for the

In the stepwise feeding of a packing material web for the application of cover strips over prepunched pouring openings, the pouring opening is sensed by means of a photocell which is located at as great a distance from the point of application as the distance between two pouring openings. Any errors in this distance will thus affect the accuracy of application. In order to avoid this is proposed in accordance with the invention to sense the passage of the actual pouring opening and start a countdown sequence, at the end of which the web feed is interrupted with the pouring opening in correct position for the application of the cover strip. An arrangement for the realization of this, seen in the direction of feed of the material web (1) comprises a sensing device (4), a processing device (5) and a forward feeding device (9) which are connected to a control unit (13).

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Malmo, Sweden

Anders Sundberg