How to evaluate the strength of sewing thread? What factors affect its strength?
Publish Time: 2024-08-21
The strength assessment of sewing threads and its influencing factors are very important parts of the sewing process, which are directly related to the quality and durability of the products. The following are detailed answers to these two questions:
1. Assessment of sewing thread strength
The strength assessment of sewing threads is mainly achieved through a series of tests, among which the most critical is the strength test. This test is used to evaluate the tensile properties and breaking strength of sewing threads. The specific steps are as follows:
Sampling and stitching: First, take a test sample that meets the requirements and sew it into a stitch of a specific length using the target sewing thread.
Tensile test: Clamp the test sample on the tensile testing machine and gradually increase the tension until the suture breaks. During this process, record the tension value at break.
Data processing: In order to obtain more accurate results, multiple tests are usually repeated, and the average value is taken as the final value of the sewing strength or breaking strength of the sewing thread.
2. Factors affecting the strength of sewing threads
The strength of sewing threads is affected by many factors, mainly including the following aspects:
Material: Sewing threads are generally made of cotton, polyester, nylon, silk and other materials. Different materials have different strengths. For example, sewing threads made of high-strength materials (such as nylon and polyester) usually have higher tensile strength.
Wire diameter: Wire diameter refers to the diameter of the sewing thread. The larger the diameter, the higher the strength. However, it should be noted that excessive wire diameter may affect the quality of the suture and the suture effect.
Structure: The structure of the sewing thread is also an important factor affecting the strength. For example, sewing threads with different structures such as single strands, windings, coated threads, and composite threads will vary in strength.
Suture pulling direction: During the sewing process, the sewing thread may be affected by various pulling directions such as stretching, extrusion, and torsion. Different pulling directions have different effects on the strength of the sewing thread, so the change of the suture pulling direction should be avoided or reduced as much as possible during the sewing process.
Matching of sewing needles and sewing threads: When sewing with sewing needles and sewing threads of different specifications, the effect will also be different. Appropriate matching can ensure the firmness and strength of the suture.
The size and uniformity of the tension during sewing: If the tension during sewing is uneven or too large, it may cause the sewing thread to break or the sewing effect to be poor. Therefore, the tension should be kept uniform and moderate during the sewing process.
The strength assessment of sewing thread needs to be achieved through professional testing methods, and the strength of sewing thread is affected by many factors such as material, wire diameter, structure, thread pulling direction, and sewing process. In practical applications, appropriate sewing thread and sewing process should be selected according to specific needs and conditions to ensure the quality and durability of the product.
