| 摘要 |
Method and apparatus for welding two container walls of plastic film ( 1, 2 ) to a plastic tube ( 3 ) having a substantially circular cross section, wherein the plastic tube ( 3 ) is arranged between two parallelly arranged plastic films ( 1, 2 ). The two plastic films ( 1, 2 ) are made to extend along the outer surface of the plastic tube ( 3 ) and to abut each other along a joint face ( 7 ) between two welding jaws ( 5, 6 ) in an area ( 8 ) adjoining the plastic tube ( 3 ). The plastic films ( 1, 2 ) are welded by means of welding jaws ( 5, 6 ) to the outer face of the plastic tube ( 3 ) and welded together in the area ( 8 ) adjoining the plastic tube ( 3 ). The plastic tube ( 3 ) is deformed during welding by means of a compressive force applied by the welding jaws ( 5, ( 5 ) to provide the outer surface of the plastic tube ( 3 ) with a substantially plane portion ( 9 ) extending on both sides of the joint face ( 7 ) and substantially perpendicular thereto.
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