Structural Characteristics of Fleece Fabric: A Knitted Base Combined with a Lofty Raised Surface

Fleece fabric is generally built on a knitted structure and then subjected to finishing processes such as brushing and napping to create its characteristic lofty surface. Its structure is defined by more than the presence of surface fibers. The knitted base, fiber arrangement, raised layer and finishing process work together to determine the fabric's thickness, flexibility, hand feel and overall appearance.

 

The knitted base forms the foundation of fleece fabric. During production, yarns are interlooped to create a continuous knitted structure. Unlike woven textiles, which are formed by interlacing warp and weft yarns, knitted fabrics contain interconnected loops that provide a degree of natural extensibility. Variations in knit construction and loop density can influence fabric thickness, stretch and dimensional stability.

 

After the basic knitted structure has been formed, the fabric is commonly subjected to brushing or napping. This process draws selected fibers away from the fabric surface, creating an initial raised layer. The intensity of brushing affects fiber height, surface density and hand feel. Carefully controlled processing helps create a relatively even surface that can then undergo further finishing.

 

Napping and related mechanical treatments contribute to the characteristic fleece appearance. During this stage, surface fibers are encouraged to interlock and form a more compact, lofty texture. Processing parameters can influence the height, density and uniformity of the raised surface, as well as the softness and visual character of the finished fabric.

 

In cross-sectional terms, fleece can generally be viewed as a combination of a relatively stable knitted base and a raised fiber layer. The knitted base provides structural support, while the lofty surface increases bulk and creates additional air spaces within the fabric. These small air pockets can contribute to the material's thermal insulation potential.

 

Fabric density is another factor that influences fleece construction. A fabric with insufficient density may have a relatively loose structure, while an appropriately engineered construction can provide a better balance between softness, stability and surface loft. Yarn size, fiber length and raw material selection can also affect the final structure of the raised layer.

 

Some fleece fabrics receive additional treatments such as double-sided napping, bonding or other finishing processes. Double-sided fleece can create a fuller and more substantial surface, while bonded constructions can provide additional structural support or other functional characteristics depending on the intended application.

 

Overall, the structural characteristics of fleece result from the interaction between the knitted base and its raised surface layer. By controlling knit construction, yarn parameters, fabric density and brushing or napping conditions, manufacturers can produce fleece materials with different levels of thickness, loft, softness and structural stability for apparel and outdoor applications.