Diagnosis the properties of LDPE tubular films under the change of the receiving rolls rate of rotation in the extrusion machine

摘要

It is established that increasing the receiving rolls rate of rotation in the extrusion machine leads to an increase in draw ratio of the tube from 7.2 to 12.4. Using differential scanning calorimetry (DSC), it was found that a similar increase in the longitudinal draw ratio leads to an increase in the content of large and medium crystal sizes and a significant decrease in the number of small crystals. It allows to get LDPE films with a thickness of 25 - 50 microns with a strength in 2 - 3 times higher than the strength of standard films. Such films are of perspective use in packaging production.