Foam filling rope applied to optical cable and its preparation process

Abstract

The invention discloses a foaming filler yarn applied to optical cables and a preparation process of the same. The preparation process comprises 40-60 parts of foaming material semi-finished products, 40-60 parts of high density polyethylene (a) and one part of nucleation master batch. The foaming material semi-finished products are composed of components with following weight proportions: 30-40 parts of low density polyethylene with a melt flow rate of 0.03-0.09g per 10 min, 30-40 parts of the high density polyethylene (a) with a melt flow rate of 1.8-3.2g per 10 min, 30-40 parts of high density polyethylene (b) with a melt flow rate of 5-9g per 10 min and 15-20 parts of micro-sized ultra-fine calcium carbonate. The foaming filler yarn applied to the optical cables is easy to be dispersed uniformly, thereby reducing bad effects of use of multiple types of additives to plastics final performance. The foaming filler yarn applied to the optical cables is capable of tightly combining a plastic film outer cladding, thereby enabling the drying degree of the filler yarn and the filling degree of air to be more constant, increasing tensile strength and side compression strength of the filler yarn, and being beneficial to the protective effect to light wave conductors.

Description

technical field [0001] The invention relates to a foam filling rope applied to an optical cable and a preparation process thereof, in particular to a foam filling rope applied to an optical cable and a preparation process thereof. Background technique [0002] Optical cable filling rope is a component that fills the space in the cable core to keep it round during the stranding process. Most of the existing filling ropes for optical cables are solid ropes extruded from high-density insulating materials. Due to their high hardness, when they are co-wound with other components to form a cable core, they will be subjected to a large extrusion force in the machine, which limits high-speed production. And it is easy to squeeze other components such as the loose tube of the optical fiber unit, deform the cable core, and affect the roundness of the optical cable. Secondly, the raw material consumption of the solid rope is large, the manufacturing cost is high, and its own weight is...

AI Technical Summary

Problems solved by technology

Disclosed as CN101382626A is a kind of invention patent of "optical cable foaming filling rope granular material and production method thereof", the raw material of filling rope granular material in this patented technology has low-density polyethylene, high-density polyethylene, polypropylene, polyethylene wax, Stearic acid, calcium stearate and tetraerythritol fat, etc., have many components and large difference in proportion, which is troublesome to weigh, difficult to disperse, and difficult to mix evenly; and because the unit price of each component is relatively expensive, the manufacturing cost is still Quite stressful; in addition, the addition and use of various additives is likely to have a negative impact on the final performance of the product, resulting in uneven distribution of air bubbles inside the product, and will leave small molecular residues in the product, affecting the mechanical properties of the product