Calculate Thread Consumption Calculating Formula

1. Identify Key Factors:

• Stitch Type: Different stitch types consume different amounts of thread. Common stitch types include lockstitch, chainstitch, overlock, and cover stitch.
• Seam Length: The total length of the seams to be sewn.
• Number of Layers: The number of fabric layers being sewn together.

2. Stitch Type Coefficients:

• Each stitch type has a specific consumption coefficient. These coefficients represent the length of thread consumed per unit length of the seam.

• Lockstitch: 2.5 times the seam length.
• Chainstitch: 2.7 times the seam length.
• Overlock (3-thread): 3.5 times the seam length.
• Overlock (4-thread): 4.5 times the seam length.
• Coverstitch (3-thread): 4.0 times the seam length.

3. Calculate Seam Length:

• Measure the total length of all seams in the garment. This includes main seams, hems, and any additional stitching required.

4. Calculate Thread Consumption for Each Stitch Type:

• Use the following formula to calculate thread consumption:

$\text{Thread Consumption}=\text{Seam Length }<b>\times </b> \text{Stitch Type Coefficient<b> </b>}<b>\times </b> \text{Number of Layers}$

5. Example Calculation:

Assume we need to calculate the thread Consumption for a T-shirt with the following details:

• Seam Lengths:
• Side seams: 1 meter each (2 seams)
• Shoulder seams: 0.25 meters each (2 seams)
• Hem: 1 meter
• Sleeve hem: 0.5 meters each (2 seams)
• Stitch Types:
  • Lockstitch for side seams and shoulder seams.
  • Overlock (3-thread) for hem and sleeve hem.
• Number of Layers: 2 layers of fabric.

Calculations:

• Lockstitch (Side and Shoulder Seams):

  • Seam Length: (2 * 1) + (2 * 0.25) = 2.5 meters
  • Coefficient: 2.5
  • Number of Layers: 2

  $\text{Thread Consumption}=2.5\times 2.5\times 2=12.5\text{ meters}$

• Overlock (Hem and Sleeve Hem):

  • Seam Length: 1 + (2 * 0.5) = 2 meters
  • Coefficient: 3.5
  • Number of Layers: 2

  $\text{Thread Consumption}=2\times 3.5\times 2=14\text{ meters}$

Total Thread Consumption:

$12.5+14=26.5$

6. Adjust for Additional Factors:

• Wastage: Add an additional percentage (e.g., 5-10%) to account for wastage and machine setup.

  • Example: Adding 10% wastage

  Total Thread Consumption=26.5×1.10=29.15 meters

By Following these steps, you can accurately estimate the thread consumption for garments, allowing for better planning and cost management in production.