| 摘要 |
<p>In order to benefit from all the advantages offered by dispenser valves comparable to precompressed metering pumps 10 when they are arranged on flexible tubes 12 which contain a more or less fluid paste 13, it is valuable to be able to create an air vacuum in the tube when its base 14 is being welded. …<??>For this purpose, a packaging method is proposed which comprises at least the following stages:… 1) the introduction of the paste through the base of the tube already equipped with its valve… 2) the drawing off, through the said base, of the air remaining in the said tube above the said product, then closure of the said tube leaktight by welding its base. …<??>Advantageously, an intermediate stage consists in firstly partially welding the base of the tube filled with paste. During stage 2, the air is drawn off through the non-welded part of the base of the tube and this is followed by the completion of the welding of this base. …<??>According to this preferred embodiment of the present method, stage 2 is advantageously implemented in its entirety by virtue of a device 50 comprising two groups of pieces which slide relative to each other which can be mounted on a press 90 and connected to a vacuum pump 91. When its lower notch 51 covers the prewelded base 14 of a tube 12 which is placed in a support 20 serving as a stop for the lower unit 52, the driving-in of the upper unit formed by the cylinders 70, 75 and 80, which is caused by the press, in fact triggers, by means of a cam 72 and balls 63, the opening of the valve 57 followed rapidly by the tightening of the jaws 54. …<IMAGE>… </p> |
