Adval Tech Holding Ag

Rudolf Lüthi

Daniel Meier

Hans Jöhr

Yasar Renkci

The invention relates to a method for the production of a rolled edge from an edge section () of a tube, wherein a flanging die is driven onto the edge section and flanges it into a roll. According to the invention, an initial area () of the edge section () is previously rolled in a positive fit manner by means of a forcibly controlled tool (). This prevents buckling of the initial area (), which has a controlled geometry as a result of rolling. The novel method is preferably used in the production of valve seats in so-called aerosol domes () for spray cans.

Method for producing a rolled edge

The invention relates to a so-called spring cushion (), for the ejection of moulded pieces () from a moulding tool (), with a plunger (), moving in a guide tube () within the moulding tool and loaded in the ejection direction () by means of a spring (). According to the invention, the spring () is embodied as a draw spring, in particular as a spiral draw spring. Considerably longer service life can be achieved as draw springs do not have radial deflections on loading.

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Niederwangen, Switzerland

Rudolf Lüthi