Because the quality of single-layer unidirectional carbon fiber directly determines the performance of its composite products or laminated orthogonal materials, how to improve the quality of unidirectional carbon fiber is particularly important. The main factors that affect the quality of unidirectional carbon fiber are: the tension control on the tow, the content of resin or glue, the actual working environment and the appearance quality of the product.

1. Tension control on tow

Tow tension control is mainly to make aramid fibers more evenly arranged in unidirectional carbon fiber and adjust the size of the gap between fibers. The tension borne by fibers can be controlled by the tension regulator on the yarn frame. Thus, the aramid unidirectional carbon fiber with excellent performance is prepared. When the tension of the aramid fiber is uniform, the width of the aramid expansion is basically the same, and the fiber is basically parallel with the fiber, so that the fiber can be played to a greater extent

2. Content of resin or glue

The product quality of unidirectional carbon fiber is greatly affected by the liquid volume of resin glue and the type of glue selected. If the viscosity of resin glue used is too large, the flow of resin requires greater pressure. The viscosity is too small, the resin may fill the roller between the infiltrated fiber bundle, resulting in loose defects in the product, followed by the resin adhesive should have a long application period and when the resin adhesive is filled, it can be quickly cured to shorten the molding cycle of the product. In the performance of the resin adhesive, the selected resin adhesive should meet the technical requirements of the product in terms of strength, modulus, toughness, temperature resistance, environmental aging resistance and fiber bonding properties.

3. Influence of actual working environment

The preparation of unidirectional carbon fiber should be carried out in a clean and bright plant, which is generally equipped with air conditioning facilities and maintained at constant temperature and humidity, and has certain requirements on cleanliness, so as to ensure the preparation quality of prepreg unidirectional carbon fiber.

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