Welding head and welding device
AssigneeLiqui-Box Germany GmbH
InventorMichael Hering
Life of this patent
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Abstract
The present invention relates to a welding head (10) for fastening an element made of plastic material to one or more flexible webs (2, 3) made of plastic material, of which a flexible container (1) is composed. The head (10) includes a body made of electrically and/or thermally conductive material having a work surface (15) that is provided for being pressed, during the welding operation, against an element of the unit to be joined. The invention is characterized in that the work surface (15) includes a series of grooves or concave formations (16) that are essentially uniformly distributed on the surface of the work surface (15).
Claims13
A welding head for fastening an element made of plastic material to one or more flexible webs made of plastic material, of which a flexible container is composed, wherein the head comprises:
- a body made of electrically and/or thermally conductive material having a work surface that is provided for being pressed, during the welding operation, against an element of the unit to be joined, wherein the work surface includes a series of grooves or concave formations that are essentially uniformly distributed on the surface of the work surface.
The welding head according to the preceding claim, wherein the grooves or the concave formations have a maximum depth that is greater than or equal to the thickness of the web made of plastic material.
(canceled)
A method for joining, by welding, a flexible web made of plastic material of which a container wall is composed, to a further element made of plastic material, in which the web and the further element are pressed together in the area of a joining zone between a hot work surface of a welding head and a contact surface of a counterhead, with heating of at least the joining zone to a temperature that is sufficient to ensure the weld, wherein the method is characterized in that at least the work surface of the welding head includes a series of grooves or concave formations that are essentially uniformly distributed on the surface of the work surface, so that the flow of molten plastic material out of the joining zone during the welding operation is prevented.
A container that is flexible, at least in part, and that is formed by the joining by welding of elements that include at least one flexible web made of plastic material, wherein at least one welding zone has an essentially regular pattern that is formed by the alternation of concave and convex and/or light and dark regions.
Dependencies are inferred from the claim text.