Brief description of the welding of the neck and of the body of the reservoir container of a plastic material, and comprising at least one reservoir according to this process, sodium hydroxide

摘要

The purpose of the invention is to provide any shape of high-quality vessels that can be easily manufactured in large quantities, and that can be used e.g. for cosmetics or pharmaceuticals. For this purpose, the invention comprises making a vessel by welding parts having edges with a reduced thickness and having different leading angles. A vessel according to the invention comprises contact walls (401, 402) of the neck (41) and/or the body (42) to be welded, that have a partially and linearly reduced thickness. The contact walls (401, 402) of the members (41, 42) to be assembled then exhibit portions (Sa1 Sa') of the contact surfaces (Sc, Sc') inclined relative to the main axis (X'X) in order to form between them an angular gap of at least substantially 3 to 5° on a portion (Sa, Sa') of said contact walls. The dimensions of the contact walls (401, 402) are such that the contact wall of one member (41, 42) is brought into contact. The thin walls have a structure that is radially deformable during the advance of the wall. Welding is carried out between the contact surfaces (Sc, Sc'), once the advance has stopped, when the contact surfaces are opposite each other, which makes it possible to assemble the contact surfaces by the fusion of the plastic material in local areas (Zc, Zc') dug in said surfaces and defining a fusion space (E).