Automatic Warp Let-Off Circular Loom Machine for Consistent Industrial Tubular Fabric

Fabric Formation Starts with Warp Supply

The fold diameter, warp distribution and surface condition of tubular woven fabric are affected by warp feeding and tension balance. Uneven warp delivery may contribute to loose yarn, dimensional variation or production stops.

This Automatic Warp Let-Off Circular Loom Machine uses an automatic warp-feeding structure with tension adjustment on both sides. It is intended for continuous weaving of PP, PE and other synthetic tape yarn into industrial tubular fabric.

“Consistent tubular fabric” means that the machine provides controllable warp-feeding and tension-adjustment conditions. It does not mean that every fabric specification is automatically produced without setup or inspection.

The Warp Path Through the Loom

Warp tapes move from the creels through the guiding, feeding, tension-control and shedding components before entering the circular weaving area.

Operators should control:

1. The warp quantity required by the fabric specification;
2. Yarn distribution across the two creel sides;
3. Tension balance between different warp groups;
4. Twisted, crossed or loose tape yarn;
5. Coordination between let-off, weaving and winding speeds.

The listed maximum warp capacity is 2592 ends. The actual quantity depends on the required fold diameter, tape width and fabric construction.

Causes of Tubular Fabric Variation

Automatic warp let-off controls the yarn-supply stage. Tubular dimensions also depend on the sizing ring, weft density, tape quality and winding pressure.

Application

The Circular Loom Machine weaves PP or PE tape yarn into tubular base fabric for industrial packaging, including fertilizer sacks, grain sacks, cement sacks and other dry-material packaging. The woven fabric can proceed to coating, printing, cutting and sewing according to the finished bag design. Strength, moisture resistance, powder containment and electrostatic performance must be confirmed through the raw material, coating, liner, seam construction and finished-bag testing.

Configuration Summary

Warp Setup Before Production

Distribute the warp evenly

Warp groups should be distributed evenly across the creels and yarn guides to prevent locally loose or crowded yarn.

Balance the tension

Check the warp tension on both sides. Trial fabric should be inspected after adjustment.

Confirm the sizing ring

The sizing ring must match the target fold diameter and remain concentric with the shuttle track.

Coordinate fabric winding

Excessive or insufficient winding pressure may affect fabric take-up. Let-off, weaving and winding should operate together.

Produce a trial sample

After changing the fold diameter, tape yarn or weft density, produce sample fabric and inspect its dimensions and construction before continuous production.

Fabric Inspection Points

• Tubular fabric fold diameter;
• Warp distribution;
• Actual picks per inch;
• Fabric weight per square meter;
• Loose tape yarn;
• Broken warp or missing weft;
• Winding alignment;
• Suitability for coating, printing and cutting.

These measurable inspection points are more useful than an unsupported general claim of “perfect fabric consistency.”

FAQ

Is automatic warp let-off the same as automatic tension control?

Not completely. Warp delivery is automatic, but the initial tension and left-right balance still require adjustment according to the fabric specification.

Must all 2592 warp ends be used?

No. The required quantity depends on the fold diameter, tape width, fabric density and product design.

Why is readjustment required after changing tape yarn?

Different tapes may have different linear density, width and elongation. The previous tension and speed settings may no longer be suitable.

Can the loom guarantee finished-bag strength?

No. Finished-bag strength also depends on the polymer, coating, cutting, sewing and final product testing.