Structure Analysis of Weft Knitted and Warp Knitted Fabrics

The Difference Between in Structure Analysis of Weft Knitted and Warp Knitted Fabrics Due Its External Work
Khurram Bahadur
Shyamoli Textile Engineering College, Dhaka
Email: www.khrrmbahadur@gmail.com


Weft knitting:
In the case of weft knitting, the interloping system in rows from the yarns with the same line engaged on the horizontal row and the looped yarns make the fabric fit on each other in parallel. Such as the formation of Weft knitting, loops are formed interloping engaged with each other at 90-degree angle.

Weft knitting interloping system
Figure: Weft knitting interloping system (Image courtesy: https://en.wikipedia.org)
Warp knitting:
On the other side of warp knitting, the interloping system are engaged with each other on two different angel of threads, such as replaced on each other. Thus the loops of yarns make the fabric fit processed by closed lap overwhelmed with under lap at 45 degree angle.

Warp knitting interloping system
Figure: Warp knitting interloping system (Image courtesy: https://nptel.ac.in)
External work of warp knitted & weft knitted fabrics:
We know from the definition of resilience that the object is slightly distorted for few times when the force is applied on an object. The elasticity is shown by the tendency to the returned state from this distorted state.

When a warp knitted or weft knitted fabric is drawn, vertical and horizontal yarn loop’s connected locations are slightly distorted.

Let's get, the F say if force is pulled on DL amount is corrupted with stress in yarn loop connection.

Link to the vertical direction of component in stress with yarn loop connection = FDL sinꝋ

Link to the horizontal direction of component in stress with yarn loop connection = FDL cosꝋ


The angle of the thread in Warp knitted cloth is 45 degrees.

Then vertically stress of component along the vertical connections = FDLsin45 = FDL 1/√2

The horizontally stress of component along the horizontal connections = FDLcos45 = FDL 1/√2

Vertical few distortion = Horizontal few distortion.

The connection between the interloping yarn of Weft knitting remains at 90 degrees.

Then vertically stress of component along the vertical connections = FDLsin90 = FDL

The horizontally stress of component along the horizontal connections = FDLcos90 = 0

So the amount of stress of distorted yarn is influenced by vertical portion of loop in weft knitting.

If we consider Newton’s third law in Weft Knitting, the horizontal portion of loop is neutral for regaining opposite force of distortion and only connected with vertical portion of regaining capability.

But if we consider Newton’s third law in warp knitting, we see that the stress of vertical and horizontal portion of closed lap is equal and so the opposite force will be same for vertical and horizontal direction of fabric.

So Warp knitted fabrics will have better elasticity.

This is why the warp knitted fabric is more elastic than weft knitted fabric.

From the definition of elasticity we know, when a force is applied on a material it goes on some is drawn on warp and weft.
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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.


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