2. PRESENTED BY
• Name with ID:
• Md. Enzamul Haque (022)
• Shawan Roy (023)
• Ahmmed Sharjin Sharif (024)
• Pankaj Roy (025)
• Kohinur (027)
• Saiful Hasan Sakib (030)
• Textile 5th Intake
• Section 1
• Bangladesh University of Business & Technology
3. DIMENSIONAL STABILITY
• Knitted fabric is so notorious for its tendency to
change size and shape in wear and washing that
to many people the phrase ‘ the dimensional
stability of knitted fabrics’ will be contradiction
in terms.
• The different dimensional stable states to which
the knitted fabrics are imposed, and
• The loop length of yarn in the knitted loop.
11. SPIRALITY
• Spirality is dimensional distortion in circular plain knitted
fabric.
• The lengthwise rows of stitches, called wales or needle
lines, should occupy a truly vertical line in the fabric &
should always be at right angles to the cross-wise course
of stitches.
• This perpendicularity of wales to the courses is frequently,
not the case & many times the wales may skew to the
right or left forming an angle, which appears in the form
of a twilled surface.
• This geometrical defect has termed spirality of knitting in
circular fabrics.
• The following fig. shows the fabrics with normal loop
position & with spirality having wales skewness.
14. THEORY OF SPIRALITY
• The above relationship shows that the angle of
spirality depends on
• 1.Number of feeders of the machine
• 2.Shape of the loop in a particular state of
relaxation and
• 3.Number of active needles in the machine
which depends on machine gauge and diameter