Polymer plasticisation and process appts. - plastic is forced under pressure through channel in ultrasonic sonotrode, melts in area of high amplitude vibration and flows out of cross-channel

摘要

Continuous lengths of plastic are fed under pressure into a channel in an ultrasonic sonotrode and melted by the effect of high amplitude vibration before leaving via a cross-channel as a flowable melt. Appts. for the process includes an ultrasonic sonotrode with an inlet channel for feeding polymer strip. At the end of the channel is an area of high amplitude vibration and the channel enters a cross-channel leading to a side outlet. A feeding wheel for the plastic is located in an area of the sonotrode with low amplitude vibration. USE/ADVANTAGE - The process and appts. are used to plasticise plastics, enable sensitive plastic strips to be welded without excessive pressure, even those mfd in a heterogeneous material and permits faster weldi