Calculation of the amount of sewing thread

Sewing thread is a large consumption of materials in clothing materials, reasonable calculation of the amount of sewing thread, not only to cost accounting for clothing, but also strengthen the planning and scientific management of production, but also conducive to clothing quality management.
First, the significance of calculating the amount of sewing thread
With the price of textile raw materials, sewing thread, especially high-end sewing thread prices are also rising. But the current garment enterprises to calculate the amount of sewing thread method is estimated by virtue of production experience, most of the enterprise sewing thread is often oversupply, open supply way, not aware of the value of sewing thread management.
In the garment industry, high-quality, low-profit background, garment processing small batch, multi-species development trend, accurate and rapid estimate of the amount of sewing thread is imminent.
The exact meaning of sewing thread usage is:
(1) the use of sewing thread is the cost of garment production enterprises an important factor;
(2) the calculation of sewing thread usage, can reduce the waste and backlog of sutures, reduce its consumption for enterprises to save inventory area, reduce inventory pressure, thereby reducing production costs and achieve maximum profit margins;
(3) sewing thread consumption assessment, can improve the staff concerned about the sewing specifications and quality awareness;
(4) by calculating the amount of sewing thread can be used to remind workers to change the line in time, such as jeans and other parts of the wire does not allow stitching stitching case, to carefully account for the amount of line to reduce the stitches due to lack of stitches float, Productivity;
Second, the calculation method of the amount of sewing thread
Sewing thread calculation, commonly used to estimate the method to obtain, that is measured by CAD software seam line length, and the total length multiplied by a coefficient (usually 2.5 to 3 times the total length of the track).
A piece of clothing suture consumption = all parts of clothing suture consumption and the sum of (1 + loss rate).
Estimation method can not accurately obtain the amount of sewing thread, the calculation of scientific sewing thread usage is the following two:
1, the formula method
The principle of the formula method is to trace the structure of the geometric curve length method, that is observed cross-linking in the sewing material in the geometric shape of the coil, the use of geometric formula to calculate the consumption of a recycling line.
By calculating the length of a stitch loop (including the stitch length + stitch cross-line with the amount of line), and then converted into stitches per meter seam amount, and then multiplied by the overall length of clothing stitch.
Formula method combines the density of the stitch, the thickness of the seam, the number of yarns used, the slit width of the seam and needle spacing and other factors, the formula method is a more accurate method, but the use of relatively complex, Specifications, style, sewing process, sewing material (fabric) thickness, the number of sutures, the density of stitches are very different, which brings too much inconvenience for the calculation, so the basic business do not.
2, seam – line length ratio
Stitch-to-length ratio, which is the ratio of the stitch length to the length of the consumed stitch.
The ratio can be calculated according to the actual production or calculated according to the formula. Test methods are stitch length and seam length of two methods.
Stitch length method: in the beginning before the sewing line in the pagoda line a certain amount of good length of the suture and make color mark, seam after the length of the measured number of stitches formed by this, Trace the amount of consumption lines.
Stitch length method: first with different thickness of the sewing material to sew, and then cut the stitch which formed a better section, the sutures were carefully dismantled, the amount of its length or weight, which converted out Line length per meter of length (length or weight).
Because “stitch – line length ratio” calculation of the amount of sewing thread is relatively simple, and the results are accurate, widely applicable to garment manufacturing enterprises.
Third, the factors affecting the amount of sewing thread
Sewing thread consumption is not only the length of the seam is closely related to the sewing thread itself, but also the thickness of the twist, the fabric structure, thickness, sewing process needle density and other factors are closely related.
But the reality of variability and flexibility of the calculation of the sewing thread there is a large deviation, the other main factors:
1, the flexibility of fabrics and lines: sewing materials and sutures have a certain degree of flexibility, the greater the elastic deformation, the greater impact on the calculation of the amount of suture. In order to make the results more accurate, for too thick and too thin, special organizational structure of the gray fabric and special materials need to add the correction factor to adjust the suture.
2, production: the larger the number of production in the case, due to the gradual strengthening of workers’ proficiency, the proportion of wear and tear will be relatively reduced.
3, after finishing: fabric or clothing washing, ironing and other treatment will cause the problem of clothing shrinkage, the need for appropriate changes.
4, the staff: the use of the suture, due to the different operating habits of the staff to bring artificial error and consumption, the consumption of the technical conditions of the factory and the actual experience of the development, through the correct operational guidance can reduce the waste.