Working mechanism of fiber heat shrink protection tube
At the fiber connector, usually a fiber (except fiber-optic cable) is protected with a fiber-optic heat-shrinkable tube.
The fiber heat-shrinkable protective sleeve is mainly used for the bare fiber portion of the single-core optical fiber. The inner tube is a hot-melt tube, the middle lining reinforcement member, and the outer tube is a transparent heat-shrinkable tube, as shown in FIG. The reinforcing members are generally stainless steel, quartz or ceramic.
When heated, the hot melt tube melts and tightly wraps the welded fiber optic connector to fill and seal; the reinforcing member acts as a support and tensile and bending resistance; the heat shrinkable tube is heat shrunk, and the fiber joint is The hot melt tube and the reinforcing member are tightly wrapped to form a whole, which increases the mechanical strength of the fiber joint portion while preventing moisture intrusion, thereby maintaining long-term stability of the fiber transmission performance.
Pay attention to the protection of the fiber when using the fiber heat shrink protection tube:
(1) Avoid residual air bubbles in the protection tube to ensure the temperature characteristics and long-term reliability of the fiber joint;
(2) A uniform tension is applied to the optical fiber to ensure that the optical fiber is in a straight line in the protective tube;
(3) Avoid twisting the fiber and prevent the loss caused by microbending;
(4) The applied tension should not be large to avoid damage caused by the increase of fiber cracks;
(5) When the fiber heat-shrinkable protection tube is completely shrunk, cooled and shaped, the tension is released to avoid microbending or macrobending of the localized heat of the fiber.