| abstract |
PROCEDURE FOR THE PREPARATION OF COMPOSITIONS FOR MOLDING BASED ON POLYAMIDE, WITH EXCELLENT BLOWING AND ELASTICITY PROPERTIES MAINLY AT TEMPERATURES BETWEEN ZERO AND C40 DEGREES. IT INCLUDES THE FOLLOWING OPERATIONS: FIRST, THE VARIOUS INGREDIENTS ARE PLACED IN A CLASSIC MIXER IN THE FORM OF POWDER OR GRANULATOR AT ROOM TEMPERATURE AND THEN SHAKED TOGETHER; SECOND, THE MIXTURE FORMED BY MALAXING IS HOMOGENIZED AT A TEMPERATURE HIGHER THAN 200 DEGREES, IN AN EXTRUDER WITH ONE OR MULTIPLE SCREWS; AND FINALLY, ONE OR SEVERAL MODIFYING AGENTS ARE ADDED TO THE MIXTURE FORMED. |