Device for producing high nominal pressure polyvinyl chloride (PVC) pipes by using common PVC mold

• Main Authors: PENG CHUNZHU, LUO JIANWU, FAN YONGBING, LI YONGFENG, ZHANG GUOCHENG, LU ZHONGYING
• Format: Patent
• Language: Chinese; English
• Published: 11.07.2012
• 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 utility model relates to a device for producing high nominal pressure polyvinyl chloride (PVC) pipes by using a common PVC mold. The production device comprises a mouth mold and a core rod arranged in the mouth mold and is characterized in that: the mouth die and the core rod are lengthened. The core rod and the mouth mold of the common PVC mold are lengthened to increase the theoretical compression ratio of the mold, so that the melt pressure for pipe production and the forming length of the mold are increased to overcome serious defects that the inner walls of the pipes have obvious joint lines and discoloration decomposition lines, the inner walls and the outer walls are not flat, the continuous productivity is low, hydrostatic test results are unqualified and the like due to the insufficient compression ratio of the mold in the production of the high nominal pressure PVC pipes. The high nominal pressure PVC pipes produced by the device have high appearance quality, materials are not blocked during con