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Question

For a fully relaxed knitted fabric, the wale constant ($K_w$) and course constant ($K_c$) are 4.2 and 5.5, respectively. If the loop length is 0.5 cm, the loop density per $cm^2$, to the nearest integer, would be ________

Knitted Fabric Loop Density Calculation

This solution determines the loop density per square centimeter for a knitted fabric using the provided loop length, wale constant, and course constant.

Loop Density Formula

Loop density ($D$) is the number of loops per unit area. For this calculation, using the given constants, the relevant formula is:

$ D = \frac{K_w \times K_c}{L^2} $

Where:

  • $D$ = Loop density (loops/cm$^2$)
  • $K_w$ = Wale constant
  • $K_c$ = Course constant
  • $L$ = Loop length (cm)

Step-by-Step Calculation

  1. Identify Given Values:

    • Wale constant ($K_w$): $4.2$
    • Course constant ($K_c$): $5.5$
    • Loop length ($L$): $0.5$ cm
  2. Calculate Loop Length Squared:

    $ L^2 = (0.5 \text{ cm})^2 = 0.25 \text{ cm}^2 $

  3. Apply the Formula:

    Substitute the known values into the formula:

    $ D = \frac{4.2 \times 5.5}{0.25 \text{ cm}^2} $

  4. Calculate the Numerator:

    $ D = \frac{23.1}{0.25 \text{ cm}^2} $

  5. Compute the Density:

    $ D = 92.4 \text{ loops/cm}^2 $

  6. Round to Nearest Integer:

    Rounding $92.4$ to the nearest integer gives $92$.

The calculated loop density is 92 loops/cm$^2$.

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Important Questions from FABR Weft and Warp Knitting

  1. Amongst the following, the component which is NOT a part of single-bed warp knitting machine, is
  2. A circular weft knitting machine with 24 inch gauge and 20 inch diameter needle bed is used to make a tubular knitted fabric. If the fabric shrinks by 35 % in course-wise direction upon withdrawal from the machine, the circumference (inch) of the shrunk tubular fabric is approximately

  3. Fabric structure related to weft knitting is
  4. Group I gives a list of terms related to woven fabrics and Group II contains equivalent terms related to knitted fabrics. Match the term from Group I with the equivalent term from Group II.

    Group IGroup II
    P. Cover1. Interlock
    Q. Double-cloth2. Wales
    R. Warp3. Tightness
    S. Weft4. Courses

     

  5. The wale constant and course constant are 4.2 and 5.04 respectively. If the loop length is 4.2 mm, then stitch density (number/cm$^2$) is______.

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