DOI: https://doi.org/10.15587/1729-4061.2014.33648

Characteristic defects of extrusioned polymeric profiles and methods of their elimination

Марія Анатоліївна Романченко, Олександр Леонідович Сокольський, Ігор Олегович Мікульонок, Ігор Анатолійович Горбань

Abstract


Products made of polymeric materials are becoming more common. At the same time, requirements for quality, accuracy of shape and sizes of products are increasing. Meeting the demand for domestic plastic products is impossible without improving the design and process parameters of equipment and polymer processing procedures. The aim of the research, described in the paper, is an analysis of the main factors affecting the quality of coextrusion formation of multilayer polymeric products and methods to eliminate defects. Production of pipes and gutters is carried out using coextrusion formation with subsequent calibration. The main defects that may occur in the polymeric profile production are "wave" defect, underfills, streaks, scratches, length distortion of the profile (saber), violation of adhesive interaction of layers and phase distribution boundary. The analysis of specific defects, their features and causes was performed. Most appropriate practical ways to eliminate defects using correction of process and design parameters were proposed. Correction of process parameters includes reducing or increasing the worm rotation rate, varying the worm temperature, temperature at the outlet of the working cylinder, temperature control in the first zones of the working cylinder (in the raw charging zone), increasing or decreasing pressure in the head. Design parameters subject to correction include the channel depth in the dosage area and compression zone length, head channel profile, length of calibration and cooling zones.


Keywords


extrusion; coextrusion; technology; formation; polyvinylchloride; profiles; defects; calibrator; adhesion; interlayer interaction

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Copyright (c) 2014 Марія Анатоліївна Романченко, Олександр Леонідович Сокольський, Ігор Олегович Мікульонок, Ігор Анатолійович Горбань

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ISSN (print) 1729-3774, ISSN (on-line) 1729-4061