What is bowing in fabric?

Answer 1

Tolerances for Modulus have to be based on the actual fabric style specification sheet.

BOW AND SKEW (BIAS)--DEFINITION AND MEASUREMENTS

Definitions:

· Bow - A fabric condition resulting when knitted courses are displaced from a line perpendicular to the selvages and form one or more arcs across the width of the fabric (see Fig. 1).

· Skew (Bias) - A fabric condition resulting when knitted courses are angularly displaced from a line perpendicular to the edge of the fabric (see Fig. 2).

Measurement Method

· Bow - A straightedge is placed across the fabric between the points at which a marked filling yarn or knitting course meets the two selvages or edges. The greatest distance between the straightedge and the marked filling yarn or course is measured parallel to the selvages (Fig. 1 Distance "D").

· Skew or Bias - Measure the skew in three places spaced as widely as possible along the length of the fabric or along a minimum of 1 linear yard. If possible, make no measurement closer to the ends of the roll or piece of fabric than 1 yard. Draw a line perpendicular to the selvage across the fabric from a point C where the marked yarn or course meets one selvage, meeting the other selvage at point B. Measure the distance between points A and B or D and B, and B and C, as shown in Fig. 2. Record the three or more skew or bias measurements. Calculate the maximum skew or bias as a percentage of the fabric width using the equation:

"% Skew = Distance AB or DB x 100 / width BC"

GIHAN RANGAN_JINADASA GROUP _SRILANKA