Flat twin-screw extruder barrel

• Main Authors: BAO MINGGANG, BAO QIBIN
• Format: Patent
• Language: Chinese; English
• Published: 08.12.2020
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The extruder barrel comprises a barrel body, the ratio of the length of the barrel body to the diameter of the barrel body is 12-18, the minimum distance between the inner wall of a parallel through hole and the outer surface of a flat double-screw rib extending into the parallel through hole is 1-4mm, the thickness of the side walls of the two parallel through holes is 20-30mm, and the wall thickness of the barrel body at the joint of the two parallel through holes is 90-100mm. An exhaust concave cavity is formed in the position, corresponding to the joint of the melting section and the discharging section of the flat double-screw, of the outer wall of the machine barrel, exhaust through holes are distributed in the bottom face of the exhaust concave cavity and communicated with the parallel through holes, a nitriding layer is arranged on the surfaces of the inner walls of the two parallel through holes, and the thickness of the nitriding layer ranges from 0.5 mm to 0.7 mm. The double-screw extruder has the