Semi-extruded one-step extrusion forming mold for flame-retardant 8-shaped optical cables

Abstract

The invention discloses a semi-extruded one-step extrusion forming mold for flame-retardant 8-shaped optical cables. The semi-extruded one-step extrusion forming mold comprises a mold frame and a moldcore, and is characterized in that an inner taper hole is formed in the mold frame, and an 8-shaped reinforced core wire and conductor wire molding orifice is arranged at one end of the mold frame, the mold core is provided with a conical diversion face matched with the inner taper hole of the mold frame, the end, facing the molding orifice of the mold frame, is provided with two output holes, namely a reinforced core wire guide hole and a conductor wire guide hole, and the conductor wire guide hole forwards protrudes from the end face of the reinforced core wire guide hole to form a step; the reinforced core wire guide hole and the conductor wire guide hole are gathered in a trapezoidal cavity in the mold core, and changed positions of the inner dimension of the trapezoidal cavity are all in circular-arc transition. Semi-extruded one-step extrusion forming can be achieved without vacuum-pumping negative-pressure auxiliary equipment, the sheath with flat and smooth outline, close binding between the sheath and the conductor wire and stable wall thickness and outside diameter are all guaranteed, the process is convenient to regulate with high production efficiency, and mold core iswearable and has long service life.

Description

technical field [0001] The invention relates to the manufacturing and molding technology of communication optical cables, in particular to a semi-extrusion primary extrusion molding mold for flame-retardant figure-eight optical cables. Background technique [0002] Figure 8 self-supporting optical cable is a kind of optical cable suitable for long-distance communication and inter-office communication. The optical fiber transmission loss is small and the dispersion is low. Due to its reasonable design and precise control of the excess length of the optical fiber in the loose tube and the cable forming method, the optical fiber cable has excellent mechanical properties and environmental performance. The compact structure of the optical cable can ensure that the optical fiber of the optical cable will not be stressed in harsh environments. Because of its convenient and fast outdoor overhead laying construction, it is widely used in some Southeast Asian countries. The traditio...

AI Technical Summary

Problems solved by technology

Due to the use of this extruded tube mold, vacuuming is required to assist production. Due to the low viscosity of the resistance fuel and poor extrusion fluidity, it is not easy to shrink under negative pressure during production. There are many deficiencies in the manufacturing process due to problems such as large outer diameter, unstable shape, low production speed, and large take-up reel.

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