Method for fastening a stabilizing arrangement on a container

A method of securing a tubular stabilizing arrangement of plastic material on a container of plastic material, said method comprising inserting the container into the tubular stabilizing arrangement into a position in which a middle portion of the bottom of the stabilizing arrangement is axially spaced from the bottom of the container while side walls of the stabilizing arrangement are in axial contact with the container, applying a force against the middle portion of the bottom of the stabilizing arrangement in order to cause it to lie against the middle portion of the bottom of the container while the walls of the tubular stabilizing arrangement axially abut against and engage the container, and simultaneously supplying energy in the region in which the middle portion of the bottom of the stabilizing arrangement lies against the middle portion of the bottom of the container, whereby the stabilizing arrangement is secured to the container in the middle portions of the arrangement and container respectively, wherein during the securing of the stabilizing arrangement to the container, the walls of said stabilizing arrangement are subjected to bending by the application of said force against the middle portion of the bottom of the stabilizing arrangement which displaces that portion axially relative to the other parts of the stabilising arrangement to cause said bottom of the stabilizing arrangement to lie against the middle portion of the bottom of the container, the middle portion of the bottom of the stabilizing arrangement remaining, after securing, in this position in which it is displaced relative to the other parts of the arrangement while said walls of said stabilizing arrangement are subjected to bending stress and tightly engage said container while being axially slidable with respect thereto.