The influence of materials on surplus length is mainly reflected in the following aspects:
The characteristics of the material itself:
The physical and chemical properties of the material directly affect the formation and stability of excess length. For example, the coefficient of linear expansion and Young's modulus of PBT material can affect its shrinkage and expansion behavior under temperature changes, thereby affecting the remaining length of the optical fiber.
Parameter control in production process:
In the production process of loose tube, the tension of fiber optic cable, viscosity of oil paste, selection of filling and extrusion molds will all affect the remaining length of fiber optic cable. For example, the tension experienced by optical fibers during unwinding can cause a certain amount of excess length in the loose tube, while the viscosity of the grease can affect the friction between the optical fiber and the loose tube, thereby affecting the formation of excess length.
Environmental factors:
Changes in environmental temperature have a significant impact on residual length. Under low temperature conditions, due to the large coefficient of linear expansion of the loose tube, it shrinks more, resulting in an increase in the excess length of the optical fiber; Under high temperature conditions, the loose tube expands less and the excess length of the optical fiber decreases. In addition, external tension can also affect the remaining length of optical fibers, leading to a decrease in transmission performance.
Specific case analysis:
Operation status of optical cable lines:
In areas with large temperature differences between day and night, loose tubes expand and contract due to temperature changes, causing optical fibers to bend under stress, increase attenuation, and even break fibers. By simulating extreme environmental conditions for experiments, effective methods for controlling fiber length can be found.
The influence of color masterbatch on the remaining length of loose tube optical fibers:
The formula and characteristics of color masterbatch (such as pigments, carrier resins, melt index, and modifiers) can affect the physical properties of loose tubes, thereby affecting the remaining length of optical fibers. By optimizing the color masterbatch formula and production process, the stability of fiber optic excess length can be improved.