SANDWICH STRUCTURES WITH CIRCULAR PROFILES, METHOD AND DEVICE FOR THEIR PRODUCTION Russian patent published in 2013 - IPC B32B27/06 B29C47/06 B29C47/70 

FIELD: process engineering.

SUBSTANCE: invention relates to sandwich film structures with circular profile and to production of exposed structures. Proposed article feature uniform thickness and comprise at least four layers and overlapping and Nonoverlapping peripheral areas. Nonoverlapping sandwich structure doubles in overlapping layer. Proposed method comprises steps whereat flow is produced with multilayer stream of at least four layers of thermoplastic resinous materials to be fed into distributing manifold of circular spinneret to form circular multilayer stream flow and to remove said flow from circular spinneret so that circular sandwich article is produced. Besides, this invention covers the device including feeder with optional layer multiplier to create multi-stream flow in at least four channels into circular spinneret manifold and circular spinneret with at least one manifold to extrude multi-stream flow.

EFFECT: production of sandwich structures, better mechanical properties.

10 cl, 11 dwg, 2 tbl, 7 ex