PROCESS MANUFACTURING POLYETHYLENE SHEET BILLETS FOR ULTRASONIC WELDING OF FLEXIBLE HIGH-STRENGTH ARTICLES Russian patent published in 1998 - IPC

FIELD: construction industry, technology of manufacture of flexible construction structures undergoing very high loads in process of use, fixing soil of motor ways, air fields and river banks. SUBSTANCE: in compliance with process starting mass of polyethylene is first extruded letting polyethylene strip out of extruder. Then strip is calendered to required dimension of thickness. Finally strip is cut to needed sizes by length and width. Extrusion is conducted under following conditions: heating temperature of material cylinder of extruder is in first zone 155-165 C, in second zone 170-180 C, in third zone 210-220 C, in fourth zone 190-200 C, in fifth zone 200-210 C, temperature of slit head is 220-230 C. Calendering is performed under following temperatures on surface of rolls of calender: lower roll 30-45 C, middle roll 35-50 C, upper roll 30-45 C. EFFECT: provision for optimum mechanical characteristics of materials of billets used to manufacture high-strength flexible articles from polyethylene by ultrasonic welding.