A process for preparing porous articles based on thermoplastic polymers by sintering the latter in the form of fine particles with diffused heat in the absence of pressure or vibration, to obtain sheets that are then subjected to manufacture by shaping them and welding by locally applied heat to a higher pressure welding temperature thereby making the desired portions of the sintered sheet join a non-porous and strongly welded area thereby forming seams or joints in the sheet or fixing it to another part. (Machine-translation by Google Translate, not legally binding)
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