Choosing the most suitable thread twist direction for your project

Choosing the most suitable thread twist direction for your project can often improve the efficiency and precision of upholstery fabrication, apparel manufacturing, and other sewing projects. Read on to learn the pros and cons of each twist direction, what kinds of projects are most impacted, sewing machine compatibility, and more.

Understanding Thread Twist

The thread production process starts with single twisting short fibers or continuous filaments to create flexible and strong fine yarns. If the thread is combined with other plies (individual threads), then a reverse twist is applied; otherwise, they’re likely to unravel. The sewing machine then twists the thread again, increasing its elasticity and durability.

Left-Twist (Z-Twist) Industrial Thread

This type of thread is best for industrial applications where there’s a need for resistance to untwisting and high tensile strength. In many cases, these left-twist threads are made from polyester and nylon to ensure elasticity and longevity.

Common Applications and Uses

• Upholstery
• Quilting
• Awnings
• Umbrellas
• Leatherwork
• Heavy-duty industrial sewing
• And many others

Pros and Cons of Left-Twist Threads

Pros:

• High tensile strength
• Less likely to untwist
• Best for heavy-duty applications
• Compatible with most sewing machines

Cons:

• If not properly managed, fraying can occur

Right-Twist (S-Twist) Industrial Thread

Right-twist (S-twist) threads are twisted clockwise. These threads are less common because they are typically reserved for projects where the thread and sewing machine need to be compatible. These threads are typically made from materials like cotton, polyester, PTFE, and others that enhance flexibility and strength.

Common Applications and Uses

• Garment sewing
• Hand sewing
• Embroidery
• Upholstery
• Serger and overlock machines

Pros and Cons of Right-Twist Threads

Pros:

• Compatible with unique sewing machines and processes
• Versatile and suitable for various applications
• Reduces fraying in some sewing processes

Cons:

• Typically only used with double-needle machines
• More likely to untwist than left-twist threads
• May not provide the same tensile strength as left-twist threads

Key Differences Between Left-Twist and Right-Twist Threads

Twist Direction

The direction of the twist affects how the threads interact with the sewing machine, and if not considered properly, can impact the quality of your final product. Generally, the twist direction doesn’t have much of an effect on strength, but it can result in poor performance if it’s used in a non-compatible sewing machine.

Performance and Behavior

Left-twist (Z-twist) threads are typically used for heavy-duty applications because they offer better resistance to untwisting. Right-twist (S-twist) threads can add softness and flexibility to sewing projects and are recommended for hand stitching, garments, apparel, and double-needle sewing machine projects.

Compatibility with Sewing Machines

Left-twist (Z-twist) threads are generally more compatible with a wider range of sewing machines, including single-needle and double-needle machines. Right-twist (S-twist) threads require specific kind of sewing machine to prevent issues like fraying, untwisting, and tangling.

Choosing the Right Thread for Your Project

The best thread twist direction for your next project depends on many factors, including the thread and fabric materials, sewing machine specs, and design considerations:

• Ensure the thread type, sewing machine, and finishing process are compatible.
• Remember that left-twist threads offer a higher tensile strength and are generally better for heavy-duty applications.
• Consider the specific needs of your project, like the need for elasticity and fray resistance

Source: Trivantage website.