采用树脂硫化体系的板式换热器三元乙丙橡胶密封垫片胶料的挤出工艺

Extrusion Process of EPDM Sealing Gasket Compound with Resin Curing System for Plate Heat Exchanger

探讨采用树脂硫化体系的板式换热器三元乙丙橡胶(EPDM)密封垫片胶料的挤出工艺。针对挤出胶条质量不均匀、表面粗糙、易焦烧、收缩率大以及硫化密封垫片易产生气孔、变形及生产效率低等问题,通过采用超长机嘴、增设机嘴加热器、低温和低速挤出、冷却方式改为风冷、增加机嘴孔数的措施,改进了树脂硫化体系EPDM胶料的挤出工艺,改善了挤出胶条的质量,提高了挤出效率,大大提高了密封垫片的质量。

The extrusion process of ethylene propylene diene rubber(EPDM)sealing gasket compound with resin curing system for plate heat exchanger was studied.For the problems of unstable cutting weight,rough surface,easy scorch,large shrinkage rate of the extrusion rubber strip,air holes,deformation of the cured sealing gasket,and low production efficiency,the extrusion process was modified,for example,by using ultra long nozzle and nozzle-heater,extruding with low temperature and low speed,changing watercooling mode into air-cooling mode,and increasing the number of holes in the nozzle.With the modified process,the quality of the extruded rubber strip and sealing gasket were improved,and the extrusion efficiency increased.