Plain Weave Derivatives PDF

# Derivatives of Plain Weave ## Plain Weave Derivatives Following weave designs can be derived from the plain weave structure: - Warp Rib - Weft Rib - Matt ## (1) Warp Ribs - By extending the plain weave in the warp direction only, the warp rib derivative of the plain weave is obtained. For examp...

# Derivatives of Plain Weave ## Plain Weave Derivatives Following weave designs can be derived from the plain weave structure: - Warp Rib - Weft Rib - Matt ## (1) Warp Ribs - By extending the plain weave in the warp direction only, the warp rib derivative of the plain weave is obtained. For example, plain weave is extended in warp direction by a factor of 2 to form a 2x2 warp rib. - Warp ribs will always be formed on two ends. ### Types of Warp Ribs - Warp ribs are of two types: - Regular Warp Ribs - Irregular Warp Ribs A diagram showing different types of warp ribs is shown below: | Warp Rib Type | Description | |---|---| | 2x2 Warp Rib | Regular Warp Ribs | | 3x3 Warp Rib | Regular Warp Ribs | | 4x4 Warp Rib | Regular Warp Ribs | | 5x3 Warp Rib | Irregular Warp Ribs | | 4x2 Warp Rib | Irregular Warp Ribs | | 3x1 Warp Rib | Irregular Warp Ribs | ## Structure of Warp Ribs - Contrary to its name, warp ribs produce stripes in the horizontal direction. - This is because the warp rib structure is such that each warp thread interlaces over a group of weft threads, causing horizontal stripe effect in the fabric. - This effect can be clearly understood by looking at the weft cross-sectional view of the design. - Consider the following two warp rib structures: - 4x4 regular warp rib - 6x2 irregular warp rib A diagram showing the structure of 4x4 regular warp rib and 6x2 irregular warp rib is shown below: - The ­­4x4 regular warp rib will produce horizontal stripes of equal width (4 picks) on either side of the fabric. - The 6x2 irregular warp rib will form horizontal stripes of 6 and 2 picks wide respectively. ## Prominence of Warp Ribs For correct and pronounced formation of horizontal stripes in warp ribs, following arrangements are used: - By keeping warp thread density much more than weft thread density. - By the use of alternate tight and slack end. - By using alternate fine and coarse ends - By using fine and coarse picks for the warp threads that work alike. ## (2) Weft Ribs - Similar to warp ribs, if the plain weave is extended in the weft direction, weft rib is obtained. For example, plain weave is extended­ in the weft­ direction by a factor of 2 to form a 2x2 weft rib. - Weft ribs will always be formed on two picks. ### Types of Weft Ribs - Weft ribs are of two types: - Regular Weft Ribs - Irregular Weft Ribs A diagram showing different types of weft ribs is shown below: | Weft Rib Type | Description | |---|---| | 2x2 Weft Rib | Regular Weft Ribs | | 3x3 Weft Rib | Regular Weft Ribs | | 4x4 Weft Rib | Regular Weft Ribs | | 3x1 Weft Rib | Irregular Weft Ribs | | 4x2 Weft Rib | Irregular Weft Ribs | | 5x3 Weft Rib | Irregular Weft Ribs | ## Structure of Weft Ribs - The weft ribs produce vertical stripes in a fabric. - This is because the weft rib structure is such that each weft thread interlaces over a group of warp threads, causing vertical stripe effect in the fabric. - This effect can be clearly understood by looking at the warp cross-sectional view of the design. - Consider the following two weft rib structures: - 4x4 regular weft rib - 6x2 irregular weft rib A diagram showing the structure of 4x4 regular weft rib and 6x2 irregular weft rib is shown below: - The 4x4 regular weft rib will cause 4 consecutive ends to group together so it will produce vertical stripes of 4 ends wide on either side of the fabric. - The 6x2 irregular weft rib will cause 6 and 2 ends to group together respectively and therefore will form vertical stripes of 6 and 2 ends wide respectively. ## Prominence of Weft Ribs For correct and pronounced formation of vertical stripes in weft ribs, following arrangements are used: - By keeping weft thread density much more than warp thread density. - By using alternate fine and coarse picks. - By using fine and coarse ends for the weft threads that work alike. ## (3) Matt Weave - Matt weave is obtained when the plain weave is simultaneously extended in both the warp and the weft direction. - For example, plain weave is extended in both directions by a factor of 2 to form a 2x2 matt weave. - Matt weave is also referred to as hopsack or basket weave. ### Types of Matt Weave - Matt weaves are of two types: - Regular Matts - Irregular Matts A diagram showing different types of matt weaves is shown below: | Matt Weave Type | Description | |---|---| | 2x2 Matt | Regular Matt Weaves | | 3x3 Matt | Regular Matt Weaves | | 4x4 Matt | Regular Matt Weaves | | 4x2 Matt | Irregular Matt Weaves | | 5x3 Matt | Irregular Matt Weaves | | 6x4 Matt | Irregular Matt Weaves |