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What are the essential differences in structure and production logic between composite spun fibers a
source：www.kingcharmgroup.com | Release time：2026-10-191、 Differences in production molding logic
Composite spinning fiber: A composite spinning process that uses the same nozzle to simultaneously extrude two types of polymer melts. The two melts converge inside the spinneret assembly and are extruded, cooled, drawn, and solidified into a single fiber through the same nozzle. Two components are combined in a fixed structure within a single fiber (such as skin core, parallel structure, sea island structure, split structure, etc.), belonging to multiple components within a single fiber. The viscosity and flowability of the two polymer melts need to be matched to ensure the stability of the spinning process and avoid adverse phenomena such as component peeling and wire breakage.
Ordinary blended fiber: does not belong to internal modification of individual fibers. During production, there are two independent finished short fibers that are spun separately to produce different types of fibers. Subsequently, in the opening and combing processes, the two types of fibers are physically mixed in a certain proportion, which belongs to the physical blending between fibers. Each fiber is still made of a single material, and there is no situation where a fiber contains two types of polymers at the same time. No special composite spinning components are required, and conventional spinning equipment can produce various types of fibers separately.
2、 Differences in microstructure of fibers
The two components of composite spun fibers are constrained within the same fiber cross-section, and the cross-sectional structure can be designed as needed, such as skin core structure or parallel structure. The components are closely connected within the fibers and will not undergo component separation during combing or processing; By combining the characteristics of different polymers, single fibers are endowed with special properties such as thermal bonding, self curling, and ultrafine splitting.
In ordinary blended fibers, various fibers are interwoven and mixed with each other, and the individual fibers maintain their original independent body. The blending ratio is only a macroscopic proportion, and the composition of a single fiber remains single, without any cross-sectional composite structure. Fibers are only mechanically held and interwoven together, and there is a possibility of separation and layering of different fiber components in subsequent processing steps such as combing, hydroneedling, and needle punching.
3、 Performance implementation logic differences
Composite spun fibers, whose performance comes from the combination of materials within a single fiber. Typical composite fibers, such as skin core type, have a core layer that ensures the basic strength of the fibers, and a lower melting point of the skin layer. After being heated, the skin layer melts, achieving thermal bonding between fibers. No additional adhesive is required when preparing non-woven fabrics; Parallel composite fibers utilize the difference in shrinkage rates between two components to produce stable three-dimensional curls after heat treatment, enhancing fiber fluffiness. Performance is achieved through the fiber's own structure, making it easier to control performance consistency.
Ordinary blended fibers have a macroscopic combination of the properties of multiple single component fibers. Mix and match fibers with different characteristics, taking into account the advantages of various fibers, such as enhancing fabric strength, improving hand feel, and adjusting moisture absorption performance. The performance is determined by different fiber ratios, and the fluctuation of ratios will directly affect the finished product indicators. The uniformity of blending has a significant impact on the stability of the product, and it cannot achieve special functions such as single fiber self thermal bonding and ultra-fine fragmentation.
4、 Process and Cost Characteristics
Composite spinning fibers require specialized composite spinning components, with a high threshold for equipment investment, complex process control, strict requirements for melt matching and temperature control, limited flexibility in product specification adjustment, and are mostly used for materials with special functional requirements.
The production process of ordinary blended fibers is simple, the equipment is versatile, the ratio adjustment is flexible, and the mixing ratio can be quickly adjusted. The production threshold is relatively low, and it is mostly used for conventional textile and non-woven products.
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