In enterprises, the calculation of sewing thread consumption is usually obtained by estimation, but the estimation method can not accurately obtain sewing thread consumption. Measure the seam length with CAD software, and multiply the total length by a coefficient (generally 2.5 ~ 3 times the total length of the seam). Sewing consumption of a garment = sum of sewing consumption of all parts of the garment × (1+ loss rate).
2. Formula method
The principle of the formula method is to apply the mathematical geometric curve length method to the stitch structure, that is, to observe the geometric shape of the cross-connected coils in the seam material and calculate the consumption of a circulating line by using the geometric formula.
By calculating the length of a stitch loop (including stitch loop length+stitch crossing amount), it is converted into stitch amount per stitch, and then multiplied by the overall stitch length of the garment.
3. Suture length method
Stitch fixed length method is the ratio of sewing stitch length to consumed stitch length. This ratio can be determined according to actual production or calculated according to formula method. There are two testing methods: suture length method and suture length method.
Extended data:
Factors affecting the amount of sewing thread;
1. Elasticity of fabric and thread: both sewing material and sewing thread have certain elasticity. The greater the elastic deformation, the greater the influence on the calculation of sewing thread consumption. In order to make the calculation results more accurate, it is necessary to add a correction coefficient to adjust the sewing of too thick and too thin gray cloth and special materials.
2. Output: In the case of large output, the proportion of loss will be relatively reduced due to the improvement of workers' proficiency.
3. Finishing: Washing and ironing fabrics or clothes will cause clothes to shrink and need to be increased or decreased appropriately.
4. Employees: During the use of suture, due to different operating habits of employees, human errors and consumption are caused. Consumption is determined according to the technical situation and practical experience of the factory, and this kind of waste can be reduced through correct operation guidance.
Sewing thread has the characteristics of seamability, durability and appearance quality. Sewing threads are generally divided into three types due to different materials: natural fiber type, chemical fiber type and mixed type; The characteristics of sewing thread also have its own unique properties due to different materials.
The consumption of sewing thread is not only closely related to the length of sewing thread, but also closely related to the thickness and twist of sewing thread itself, the weave structure and thickness of fabric, the density of needle code in sewing process and other factors. Therefore, the variability and flexibility of reality make the calculation results of sewing thread have great deviation.
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