Mechanical Process in Textile Weaving, How Fabric Is Made on the Loom

How Is Fabric Made on a Loom?

The textile weaving process is the mechanical interlacing of two sets of yarns, warp yarns (longitudinal) and weft yarn(crosswise, also called filling yarns), to form a woven fabric.

On a modern air-jet or rapier weaving machine, the process happens in three synchronized motions:

1. Shedding, Opening of warp threads
2. Picking, Insertion of weft yarn
3. Beating-up, Reed pushes weft into place

Each mechanical component of the loom controls either the warp passage or the weft passage. Proper warp preparation through sizing (using high-performance compounds like Alpenol) ensures smooth loom performance and minimal breakage.

What Is the Role of Warp and Weft in Textile Weaving?

Before understanding the machines, it is important to understand the two yarn systems:

Warp yarns are sized during the sizing process to withstand friction and high-speed weaving. Weft yarns typically are not sized.

Warp Passage, How Warp Yarns Travel Through the Loom

1. What Is the Weaver’s Beam?

Function:

The weaver’s beam holds the prepared warp sheet.

Mechanical Role:

• Supplies warp yarns under controlled tension
• Rotates gradually as fabric is produced
• Ensures uniform yarn delivery

If warp tension fluctuates, fabric defects such as uneven density in woven fabric may occur.

2. What Is the Back Rest?

Function:

The back rest is a guiding roller after the weaver’s beam.

Importance:

• Equalizes warp tension
• Controls warp angle
• Stabilizes warp sheet

It helps maintain proper shedding geometry.

3. What Are Drop Pins (Drop Wires)?

Function:

Drop pins detect warp thread breakage.

Working Principle:

• Each warp thread passes through a drop wire
• If warp thread breaks → drop wire falls
• Machine stops immediately

This protects fabric quality and prevents long defects.

4. What Are Heald Wires (Heald Frames)?

Function:

Heald wires control warp thread movement.

Each warp thread passes through a heald eye.

Role in Weaving Techniques:

• Lift or lower warp threads
• Create weave structures
• Form shedding motion

Different weave patterns such as plain weaving, twill weave, or satin weave pattern depend on heald frame movement.

5. What Is the Reed and Its Function?

Function:

The reed spaces warp threads and beats the weft yarn into position.

Warp threads pass through small gaps called dents.

Importance:

• Maintains fabric width
• Controls ends per inch (EPI)
• Assists in beating-up motion

6. What Is Reed Beating?

Mechanical Action:

After each weft insertion, the reed moves forward.

Purpose:

• Pushes the weft threads firmly into fabric
• Maintains consistent fabric density
• Determines pick per inch (PPI)

Incorrect beating causes loose or tight fabric.

7. How Is Fabric Formed?

At the fell of the cloth, warp and weft interlace.

The interlacement creates different types of weaves:

• Plain weave
• Twill fabric
• Satin fabric
• Jacquard fabric

This is where the woven fabric is actually formed.

Weft Passage, How Filling Yarns Travel Through the Loom

1. How Is Fabric Design Decided?

Fabric design is programmed through:

• Dobby system
• Jacquard loom
• Electronic control panel

The weave structure determines:

• Warp lifting sequence
• Weft insertion timing
• Final weave fabric pattern

2. What Is the Weft Cone?

Function:

The weft yarn is supplied from a cone.

Role:

• Feeds filling yarn
• Ensures continuous weft supply

3. What Is the Pre-Winder?

Function:

The pre-winder measures exact weft length.

Importance:

• Controls pick length
• Prevents yarn waste
• Improves insertion precision

4. What Is the Tendon Valve?

Function:

In airjet looms, the tendon valve:

• Initiates compressed air flow
• Carries weft yarn through shed

It ensures high-speed insertion.

5. What Are Main Valve and Sub Valve?

Main Valve:

Provides primary air pressure.

Sub Valve:

Supports weft travel across full fabric width.

Together they:

• Control air pressure
• Stabilize weft insertion
• Ensure correct filling yarn placement

6. How Does the Weft Reach the Reed?

Compressed air propels weft yarn across the open shed formed by heald wires.

The reed then:

• Guides
• Aligns
• Beats the weft into place

7. Reed Beating and Fabric Formation

Once weft is inserted:

1. Shed closes
2. Reed beats weft into position
3. Fabric advances forward

The take-up motion winds finished fabric onto cloth roller.

Complete Weaving Process Summary

Why Warp Preparation Is Critical Before Weaving

High-speed weaving (1200+ picks/min) requires:

• Strong warp yarns
• Smooth surface
• Minimal hairiness
• Controlled elongation

This is achieved during the textile sizing process using advanced starch-based compounds.

Properly sized warp yarns reduce:

• Loom stoppages
• End breakage
• Fabric defects

Modern compound sizing agents reduce synthetic dependency while maintaining adhesion and flexibility.

8. FAQs

Also Read

• Mechanical Process in Sizing, How Warp Yarns Are Prepared for Weaving
• Checkpoints in the Weaving Process
• How Fabric Is Made: The Complete Guide From Fiber to Finished Textile