Method of controlling the power of a welding unit in ultrasonic welding operations and an arrangement for carrying out the method
AssigneeMolnlycke AB
InventorAndreas Wannebo
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Abstract
A method and device for controlling the power intake of a welding unit (1) with an ultrasonic horn (2) and an anvil holder (3) equipped with anvils (4). The mean distance of the ultrasonic horn (2) from the anvil (4) is controlled so that the power intake of the welding unit (1) will coincide with a predetermined control value.
Claims9
A method of controlling the power of a stationary welding unit when ultrasonically welding webs of material (5, 6) which pass between an ultrasonic horn (2) of the welding unit (1) and an anvil holder (3) equipped with anvils (4), comprising
- controlling a mean distance of the ultrasonic horn (2) from the anvil (4) so that power for the welding unit coincides with a predetermined control value.
An ultrasonic welding device for mutually joining webs of material (5, 6) which pass between an ultrasonic horn (2) of a stationary ultrasonic welding unit (1) and an anvil holder (3) equipped with anvils (4), the device comprising means (11) for measuring and indicating a power intake of the unit (1), means (7-9) for moving the ultrasonic horn (2) so as to change its mean distance from the anvil (4);
- and means (10) for comparing the measured power with a control value and controlling the horn-moving means (7-9) in accordance with the difference between the measured power and the control value.
Dependencies are inferred from the claim text.