COEXTRUSION HEAD Russian patent published in 2020 - IPC B29C48/25 

FIELD: technological processes.

SUBSTANCE: invention relates to devices for production of multilayer articles of flat and other forms, namely to head for coextrusion. Head for coextrusion comprises a detachable housing and consisting of sections. Recess for liquid circulation is provided in the center between two sections. Sections form two forming channels communicating with feed channels. Recess for liquid circulation has a triangular cross-section, is placed in a divider shaped as a triangular prism, external faces of which are flat, and the vertex is located in the zone of the output window, which changes into a cavity of a larger size. On the outer upper flat edge of the divider there are parallel longitudinal grooves, the depth and width of which increases from the supply channels to the outlet opening. On the surface of the outer lower flat face of the divider there are parallel longitudinal ribs, the height and depth of which increases from the supply channels to the output window. Distances between longitudinal ribs and longitudinal grooves are identical. Supply channels have circular section smoothly changing into forming channels of semicircular sections, flat sides of which are formed by flat faces of divider. Square cross-sections of forming and connected to them appropriate feed channels are identical. Outlet opening formed by the merging of the forming channels passes through the diffuser into the cavity of circular section of larger size. On surfaces of outer upper and lower flat faces of divider there are alternating parallel longitudinal grooves and parallel longitudinal ribs.

EFFECT: technical result consists in simplifying the design for production of multilayer articles of circular section by coextrusion, as well as prevention of material shift in transverse direction and distortion of shape of obtained article.

1 cl, 3 dwg