weft knit fabric geometry
TRANSCRIPT
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WEFT KNIT FABRIC GEOMETRYPRESENTATION ON
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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
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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.
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DIMENSIONAL CHARACTERISTICS
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DIMENSIONAL CHARACTERISTICS
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DIMENSIONAL CHARACTERISTICS
Constants for geometry of plain worsted knitted fabrics at different stable states (imperial unit)
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DIMENSIONAL CHARACTERISTICS
Constants for geometry of plain worsted knitted fabrics at different stable states (SI unit)
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AREAL DENSITY
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FABRIC COVER
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TIGHTNESS FACTOR
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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.
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THEORY OF SPIRALITY
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THEORY OF SPIRALITY
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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
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MEASUREMENT OF SPIRALITY
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