The difference in twist degree between the polypropylene double-twist yarn used for the webbing and the polypropylene double-twist yarn used for the sewing thread? Check the table! 

Polypropylene double-twist yarn (high-strength polypropylene double-twist yarn) is widely used in areas such as webbing, sewing thread, and industrial fabrics. Many purchasers often encounter a common problem when selecting the type: For the same double-twist yarn, what is the difference in twist degree when used for webbing versus sewing thread? Choosing the wrong one may result in the webbing twisting or the sewing thread breaking. Below, from the perspective of twist degree, we will help you clarify the differences between the two applications. 

Polypropylene double-twist yarn for webbing: Low twist, stable, anti-twisting

The core requirements for the double-twist yarn used in webbing are: no twisting of the yarn during weaving, a flat fabric surface, and uniform tension in the warp direction. 

Twist characteristics: The warp yarns of the fabric usually have a lower twist (such as 200-400 twists per meter) to ensure the softness of the yarn, clear openings during weaving, and uniform coverage in the weft direction. Excessive twist will make the yarn stiff, cause twisting during weaving, and affect the flatness of the fabric surface. 

Twist matching: The twist directions of the warp and weft yarns used in the fabric need to be coordinated. Usually, the warp yarns use Z twist and the weft yarns use S twist, or vice versa. This coordination can balance the torque during the weaving process and prevent the fabric surface from showing weft skew or knotting. When purchasing, inform the supplier of your loom type and fabric structure so that they can match the appropriate twist direction and twist degree. 

II. Polypropylene double-twist yarn for sewing thread: medium-high twist, smooth, high knot strength

The requirements for sewing thread regarding double-twist yarn are different from those for webbing: it needs a smooth surface, high knot strength, and should not break easily during high-speed sewing. 

Twist characteristics: Sewing threads usually adopt medium to high twist levels (such as 600-1000 twists per meter) to ensure a tight surface of the yarn, fewer fuzzes, and high strength of knots. Higher twist levels help reduce friction and the risk of thread breakage during the sewing process. 

Number of strands and twist direction: Sewing threads usually consist of two or three strands combined. The twist direction of the strands is opposite to that of the single yarn (for example, if the single yarn has a Z twist, the strands have an S twist) to balance the torque and reduce the twisting of the thread loops. When purchasing, it is necessary to specify the number of strands required and the final use (such as straight sewing, overlock sewing, or hemming). 

Comparison item: Polypropylene double-twisted yarn for webbing | Polypropylene double-twisted yarn for sewing thread

Typical twist range: 200-400 twists per meter (lower) | 600-1000 twists per meter (medium-high)

Surface requirements: Smooth, uniform, few fuzz fibers | Extremely smooth, very few fuzz fibers

Tensile strength of knots: Moderate requirement | High requirement

Twist direction matching: Twist directions of warp and weft yarns match | Single yarn and plied yarn have opposite twist directions 

Summary and Selection Suggestions: 

When purchasing polypropylene double-twist yarn, it is recommended to follow the steps below for confirmation: 

Designated purpose: Is it for warp yarn of the fabric, weft yarn of the fabric, or sewing thread? The twist degree, twist direction and ply number required vary depending on the different uses. 

Additional specification: Inform the target denier (total denier), ply count, whether high strength is required, and whether color addition is needed. 

Final sample trial weaving/trial sewing: Conduct a small-scale trial on your weaving or sewing equipment. Observe whether the weaving is twisted or the sewing is smooth. Confirm that it meets expectations before increasing the order size. 

Guangdong Modern High-tech Fiber Co., Ltd. specializes in the production and research of polypropylene FDY network yarn, polypropylene network yarn, polypropylene double-twist yarn, high-strength polypropylene double-twist yarn, and polypropylene ATY yarn. We can match the appropriate twist degree and twist direction according to the application requirements. Please feel free to request samples for testing.

Declaration: The content and template of this article are sourced from the internet and are copyrighted by the original author; if any infringement is detected, please notify us immediately and we will delete it. 

Guangdong Modern High-tech Fiber Co., Ltd. Official Website: http://www.gdguangdong.com