| Autor: |
Jesse Gadley, João M. Maia, Sidney O. Carson, Patrick J. Harris |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
Polymer Engineering & Science. 55:1520-1527 |
| ISSN: |
0032-3888 |
| DOI: |
10.1002/pen.24097 |
| Popis: |
This research work presents the first continuous multilayer coextrusion system for high viscosity elastomeric materials. Three unvulcanized rubber materials were chosen to validate the system: two butyl rubbers and a polyisoprene. The elastomers were characterized under oscillatory shear and the results used to perform computational flow simulations to investigate the effect of geometry on the flow path and flow rate. Successful extrudates of 8 and 32 layers were extruded at two different throughput rates for rheologically matched and rheologically mismatched material pairs. The results show good layering performance for both systems with little existence of viscous encapsulation and acceptable pressure drops. Computational and experimental results both show a nonuniform layer thickness distribution due to the geometric design of the layer multiplier extrusion dies, which were designed to minimize pressure drop in the system. This nonuniformity decreases with increasing number of layers. POLYM. ENG. SCI., 55:1520–1527, 2015. © 2015 Society of Plastics Engineers |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Plný text