Two-layer co-extrusion die for optical cable sheath

Abstract

The invention provides a two-layer co-extrusion die for an optical fiber sheath. The two-layer co-extrusion die for the optical fiber sheath comprises a die core and a die sleeve arranged on the die core in a sleeving mode. The front end of the die core is a conical part. An extrusion forming part is arranged on the conical part. A forming cavity corresponding to the extrusion forming part and a positioning cavity corresponding to the conical part are formed in the inner wall of the die sleeve. The size of an extrusion space between the inner wall of the forming cavity and the extrusion forming part is constant. A plurality of color strips corresponding to the die sleeve are arranged on the die sleeve. Troughs separately communicating with the color strips are formed in the outer surface of the die sleeve. The two-layer co-extrusion die for the optical fiber sheath is simple in structure, convenient to use, simple in process and capable of reducing the cost, and replacement of a machine head is not needed. The die core and the die sleeve can be fixed together in a matched mode firmly, so that the stability in use is good, and the quality of finished products is good; and in addition, the corresponding color strips can be produced and processed according to actual requirements, and thus, the controllability is high.

Description

technical field [0001] The invention belongs to the technical field of optical cable production equipment, and in particular relates to a double-layer co-extrusion die for an optical cable sheath. Background technique [0002] Most of the existing double-layer co-extrusion dies for optical cable sheaths adopt a separate structure for the mold sleeve and the mold core. The sheath is extruded through the mold core and enters the port of the mold sleeve. If the color stripe is extruded outside the sheath, it is very difficult to achieve , if an additional color strip mold is used, it will be difficult for the molding device to ensure reliable concentricity, the product quality will be unstable, and the color strips will be uneven. In addition, the head of the extruder needs to be greatly modified to be able to install the existing mold. Usually, it is realized by using a double-layer co-extrusion head. There is an urgent need to design a double-layer co-extrusion die for optic...

AI Technical Summary

Problems solved by technology

[0002] Most of the existing double-layer co-extrusion dies for optical cable sheaths adopt a separate structure for the mold sleeve and the mold core. The sheath is extruded through the mold core and enters the port of the mold sleeve. If the color stripe is extruded outside the sheath, it is very difficult to achieve , if an additional color strip mold is used, it will be difficult for the forming device to ensure reliable concentricity, the product quality will be unstable, and the color strip will be uneven

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