Page 76 - Shawl Weaving Artisan - TT

Textile & Handloom Related Theory for Exercise 1.4.38
Shawl Weaving Artisan - Defects and Yarn Quality

Sectional warping calculation

Objectives: At the end of this lesson you shall be able to
• calculate number of sections required based on total warp yarns and yarns per section.

Sectional warping: Sectional warping is the commonly 4 Number of patterns per section (P)
used system for producing woollen and worsted warps. It Weaving patterned fabric and the pattern repeats across
is a very flexible system that not only allows for full warp the width.
preparation from an individual yarn but can also enable
warps to be prepared with a combination of yarns of Formula
different count and/or colour. Sectional warping is ideal Ends per section
when more than one colour of warp yarn is used to form P =
patterns, such as in stripes and checks. Ends per pattern repeat
Make sure the result is a whole number; otherwise, you
Sectional warping calculation may need to adjust section or pattern size to ensure
Total no of ends symmetry.
1 Number of Sections =
Creel capacity 5 Width of warp (W)
Example: The total number of ends in a warp is 2700. Calculated from the reed count (R) and ends per dent
Calculate the number of sections to be made, if the (Ed):
capacity of creel is 500 bobbins.
Formula:
Solution Total Ends (E)

Here, W =
Reed Count (R)×Ends per Dent (Ed)
No of ends = 2700 For example, if:
Creel Capacity = 500 • Total Ends = 1200
Total no of ends
Number of Sections = • Reed Count = 60 dents/inch
Creel capacity • Ends per Dent = 2
2700
= = 5.4 ≈ 6. Then:
500 1200
2 Width of Section = Width of Warp on Loom Beam W=
60×2
Number of Sections =10 inches.
Example: If 6 sections are to be made for a warp, which 6 Total number of ends (E)
is 29 inches wide in the reed, calculate the width of each
section. Calculated from reed count, fabric width, and ends per
Solution: dent:
Here, Total width of warp = 29. Formula
Number of Sections = 6 E = R × W × Ed
29 For example, if:
Width of each section = = 4.83. • Reed count = 60 dents/inch
6
3 Creel capacity (Cc) • Fabric width = 10 inches
This refers to how many cones/spools of yarn can be • Ends per dent = 2
mounted on the creel at a time. Then:

Formula E = 60 × 10 × 2 = 1200 ends
Total Number of Ends Table of key formulas
Cc = = Ends per Section
Number of sections Parameter Formula
If already know the number of ends per section (e.g., Total Ends (E) E= R x W x Ed
based on design or creel size), you can directly determine E
creel capacity. Alternatively, if creel size is fixed, use: Width of warp (W) W = R x Ed
Total Ends E
Number of Sections = Number of Sections (S) S =
Creel capacity Cc

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