How to calculate the amount of sewing thread
Calculation method of sewing thread consumption. As the price of textile raw materials increases, the price of sewing thread, especially high-end sewing thread, is also rising. However, the current methods used by garment enterprises to calculate the amount of sewing thread are mostly based on production experience. Most enterprises often have an oversupply of sewing threads, open supply, and do not realize the value of sewing thread management.
Calculate the amount of sewing thread!
1. Calculation method of sewing thread consumption
The calculation of sewing thread consumption is obtained by the commonly used estimation method by enterprises, that is, measuring the length of the sewing line through CAD software and multiplying the total length by a coefficient (usually 2.5 to 3 times the total stitch length).
Sewing consumption of a garment = sum of sewing consumption of all parts of the garment × (1 + loss rate).
The estimation method cannot accurately obtain the amount of sewing thread. There are two scientific methods for calculating the amount of sewing thread:
1. Formula method
The principle of the formula method is to use mathematical geometric curves for the stitch structure. The length method is to observe the geometric shape of the cross-connected loops in the sewing material and use geometric formulas to calculate the consumption of a loop line.
By calculating the length of a stitch loop (including the length of the stitch loop + the amount of thread used at the intersection of the stitches), then converting it into the amount of stitches per meter of stitching, and then multiplying it by the overall stitch length of the garment.
The formula method combines factors such as stitch density, sewing material thickness, yarn count, overlock slit width, and stitch length. Therefore, the formula method is a more accurate method, but it is relatively complicated to use. , the specifications, styles, sewing processes, sewing material (gray fabric) thickness, stitch count, stitch density, etc. of the garment varieties are all very different. This brings too much inconvenience to the calculation, so enterprises basically do not use it.
2. Stitch-thread length ratio
Stitch-thread length ratio is the ratio of sewing stitch length to consumed stitch length. This ratio can be measured based on actual production or calculated based on the formula. There are two testing methods: suture fixed length method and seam fixed length method.
Sewing length fixing method: Before starting sewing, measure a certain length of stitching on the pagoda line and mark it with a color. After sewing, measure the number of stitches formed by this length to calculate Thread consumption per meter of stitch length.
Sewing length-fixing method: First sew with different thicknesses of sewing materials, then cut a section with better seam formation, carefully disassemble the stitches, and measure their length or weight. , thus converting the amount of thread (length or weight) used per meter of stitch length.
2. The significance of accurate calculation of the amount of sewing thread:
(1) The amount of sewing thread used is an important factor for enterprises to calculate the cost of clothing production;
(2) Calculating the amount of sewing thread used can reduce sewing costs. Waste and backlog of thread, reducing its usage can save inventory area and reduce inventory pressure for enterprises, thereby reducing production costs and maximizing profit margins;
(3) Assessment of sewing thread consumption can improve employee concern Awareness of sewing specifications and quality;
(4) By calculating the amount of sewing thread used, workers can be reminded to change threads in time. For example, when stitching is not allowed in open-stitched areas such as jeans, the amount of thread used must be carefully calculated to reduce the number of threads used. The seam removal surplus caused by insufficient stitches can improve production efficiency;
Because the “seam-thread length ratio” is relatively simple to calculate the amount of sewing thread, and the calculation results are accurate, it is widely applicable to clothing manufacturing enterprises.
3. Factors affecting the amount of sewing thread
The amount of sewing thread consumption is closely related not only to the length of the seam pattern, but also to the thickness and twist of the sewing thread itself, the structure and thickness of the fabric, and the sewing process. Factors such as the needle code density are closely related.
However, the variability and flexibility of reality cause large deviations in the calculation results of sewing threads. The other main influencing factors are:
1. The elasticity of fabrics and threads: both sewing materials and threads are It has a certain degree of elasticity. The greater the elastic deformation, the greater the impact on the calculation of suture dosage. In order to make the calculation results more accurate, correction factors need to be added to adjust the seams of gray fabrics that are too thick or too thin, with special structures and special materials.
2. Output: When the production quantity is large, the proportion of losses will be relatively reduced as the proficiency of workers gradually increases.
3. Post-finishing: Washing and ironing of fabrics or clothing will cause shrinkage of the clothing, so appropriate additions and subtractions are required.
4. Employees: During the use of sutures, human errors and consumption are caused by the different operating habits of employees. The consumption is determined based on the technical status and actual experience of the factory. This can be reduced through correct operating guidance. item wasted.
The competition in the garment industry is becoming increasingly fierce. Enterprises should have a sewing thread calculation method suitable for them to help manage sewing threads and provide a reference for saving production costs.
Keywords:
Sewing Thread Sewing Thread Calculation
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