A method for welding at least two parts including a thermoplastic material and having respective surfaces to be welded, including: inserting an insert between the surfaces to be welded of the two parts; generating heat via the insert; wherein the insert moves in relation to the parts to be welded in a welding direction. Also, an installation adapted for implementation of this method.

The invention first relates to a method for welding at least two parts comprising a thermoplastic material and having respective surfaces to be welded, comprising: inserting an insert between the surfaces to be welded of the two parts; generating heat via said insert; wherein the insert moves in relation to the parts to be welded in a welding direction. The invention also relates to an installation adapted for implementation of this method.

Examples of the present disclosure relate to a method of manufacturing a container for a printing material. The method includes providing a first portion of the container comprising an opening circumscribed by an annular wall. The method then includes providing a second portion comprising an annular cavity, followed by joining the two portions by advancing the annular wall into the annular cavity by applying a compressive force in an axial direction of the opening, and temporarily rotating the first portion and the second portion relative to each other to fuse the first and second portions.

A method for fabricating a preform by providing a plurality of preform segments which each define a portion of a preform, positioning said preform segments in continuous contact with each other along at least one edge of said preform segments such that said plurality of preform segments define a cavity, and bonding each of said preform segments to at least one other preform segment such that said plurality of preform segments forms a continuous whole.

A method for fabricating a preform (100) by providing a plurality of preform segments (101-103) which each define a portion of a preform (100), positioning said preform segments (101-103) in continuous contact with each other along at least one edge of said preform segments (101-103) such that said plurality of preform segments (101-103) define a cavity (107), and bonding each of said preform segments (101-103) to at least one other preform segment such that said plurality of preform segments (101-103) forms a continuous whole.