What is the effect of the addition ratio of multi-color masterbatch on the color uniformity of the fiber and the quality of the product?

In the production of non-woven polypropylene fibers, the addition ratio of multi-color masterbatch has a significant effect on the color uniformity of the fiber and the quality of the product. The following is a specific analysis:

1. Color uniformity
Too low addition ratio:
Too light or uneven color: If the addition ratio of the masterbatch is insufficient, the fiber color may be too light or the color distribution may be uneven. This is because the pigment particles in the masterbatch are not fully dispersed in the entire fiber matrix, and color loss or color difference may occur in local areas.
Dispersion problem: Low addition ratio may cause the pigment particles to aggregate and cannot be evenly dispersed in the polypropylene matrix, thus affecting the overall color uniformity of the fiber.
Too high addition ratio:
Too dark or dark color: Too many masterbatches will make the fiber color too dark or dark, and may even cause the accumulation of pigment particles, resulting in spots or stripes on the fiber surface.
Poor dispersion: High addition ratio may exceed the carrying capacity of the fiber matrix, making it difficult for the pigment particles to be evenly dispersed, which will aggravate the problem of uneven color.
Ideal addition ratio:
Uniform dispersion: The appropriate addition ratio can ensure that the pigment particles are evenly dispersed in the polypropylene matrix, thereby achieving a uniform color effect.
Color stability: The ideal addition ratio can ensure the color consistency of the fiber in different batches, reduce color difference, and improve the appearance quality of the product.

2. Product quality
Mechanical properties:
Too low or too high addition ratio: Improper addition ratio of masterbatch may affect the mechanical properties of the fiber. Too low addition ratio may lead to insufficient fiber strength, while too high addition ratio may cause pigment particles to aggregate, forming stress concentration points, reducing the tensile strength and toughness of the fiber.
Ideal addition ratio: The appropriate addition ratio can ensure that the fiber maintains good color uniformity while maintaining its mechanical properties, such as tensile strength, elongation at break, etc.
Processing performance:
Too low or too high addition ratio: Improper addition ratio of masterbatch may affect the processing performance of the fiber. For example, too low addition ratio may cause fiber breakage during spinning, while too high addition ratio may cause fiber to block the spinneret during processing.
Ideal addition ratio: The appropriate addition ratio can ensure that the fiber has good fluidity and spinnability during processing, reduce faults during processing, and improve production efficiency.
Weather resistance and stability:
Too low or too high addition ratio: Improper addition ratio of masterbatch may affect the weather resistance and stability of the fiber. Too low addition ratio may cause the color of the fiber to fade during long-term use, while too high addition ratio may cause pigment particles to precipitate on the fiber surface, affecting the appearance and performance of the fiber.
Ideal addition ratio: The appropriate addition ratio can ensure that the fiber maintains good color stability during long-term use, while avoiding the precipitation of pigment particles, improving the weather resistance and service life of the fiber.

3. Precautions in actual production
Pigment selection: Different pigments have different dispersibility and tinting power. Therefore, when selecting masterbatch, it is necessary to select the appropriate type of pigment according to the color requirements of the fiber and the production process.
Dispersion equipment: During the production process, efficient dispersion equipment, such as twin-screw extruders, is required to ensure that the pigment particles in the masterbatch can be fully dispersed in the polypropylene matrix.
Quality control: During the production process, the addition ratio of masterbatch needs to be strictly controlled, and the color uniformity and quality indicators of the fiber need to be monitored in real time through online testing equipment, and the production process needs to be adjusted in time to ensure the stability of product quality.