Properties, Characteristics, And Classification Of Polypropylene Multifilament

Fiber Morphology: Polypropylene multifilament yarns come in various cross-sectional shapes, most commonly round or trilobal. Trilobal fibers offer superior moisture absorption and stain resistance due to their larger surface area, making them suitable for applications requiring high levels of cleanliness.

 

Linear Density (Denier/D): Typically ranging from 30D to 1000D; a higher Denier count indicates thicker individual filaments and greater strength, though flexibility is reduced. For instance, 30D multifilament is suitable for fine fabrics, whereas 1000D is appropriate for industrial filter cloths or ropes.

Shrinkage Rate: The shrinkage rate of polypropylene multifilament can be adjusted during processing. Low-shrinkage products are ideal for applications requiring dimensional stability, such as carpet backing; high-shrinkage products are suitable for fabrics requiring elasticity or a voluminous feel.

F-number: This refers to the number of individual filaments within the multifilament yarn, typically ranging from 12F to 576F. A higher F-number improves coverage and uniformity but also increases production complexity and cost.