PROCESS FOR MANUFACTURING A PLASTIC-BASED CELLULAR STRUCTURE AND DEVICE FOR IMPLEMENTING THIS PROCESS

摘要

Process for manufacturing a plastic-based cellular structure, in which : parallel lamellae of a composition based on at least one plastic are continuously extruded, in an approximately horizontal direction, through a die having a front face provided with a plurality of parallel slots (5) and with an insulating material, at least on the surface; and upon exiting the die, the spaces lying between two adjacent lamellae are subjected, in successive alternations and between two sizing units (8) whose length is short enough for the plastic composition to remain molten, to an injection of compressed gas and to a vacuum, the two sides of a given lamella being, in respect og one of them, subjected to the action of the compressed gas and, in respect of the other of them, subjected to the action of the vacuum, and vice versa during the next alternation, so as to deform the lamellae and weld them together in pairs, with formation, in a plane approximately parallel to the extrusion direction, of a cellular structure whose constituent cells extend perpendicular to the extrusion direction.