Automatic Yarn-Break Stop Circular Loom Machine for Chemical Powder Packaging Fabric

Product Focus: Stopping After Yarn Abnormalities

When a warp or weft yarn breaks and the loom continues running, the tubular fabric may develop an extended weaving defect that affects subsequent coating, cutting and bag conversion.

This Automatic Yarn-Break Stop Circular Loom Machine monitors warp and weft conditions. When the system detects broken weft, exhausted weft, broken warp or loose warp, it can request the main drive to stop for inspection.

The system limits continued weaving after a detected abnormality. It does not prevent every yarn break or replace manual fabric inspection.

Warp and Weft Monitoring Logic

The weft detector uses pulse signals generated by shuttle operation. Regular signals indicate normal yarn movement. A broken or exhausted weft changes the signal condition and initiates the stop command.

Relevance to Chemical Packaging Fabric

Chemical powder sacks may require coating, a separate liner or a specified closure after the tubular base fabric has been woven. Missing weft, broken warp or visible weave openings can affect the consistency of these downstream processes.

After an automatic stop, the operator should check:

• Whether the broken yarn has been reconnected;
• Whether warp tension is balanced;
• Whether the shuttle and weft package are positioned correctly;
• Whether the transmitter faces the receiver;
• Whether the affected fabric section should be marked or removed.

Application

The machine weaves PP, PE or other plastic tape yarn into tubular base fabric for packaging resins, inorganic salts, mineral additives and other dry chemical powders. Depending on the material, the woven fabric may require downstream coating, lining, cutting and sewing. Automatic yarn-break stopping controls specific weaving abnormalities; it does not establish chemical resistance, moisture protection, sift-proof performance, electrostatic classification or dangerous-goods compliance for the finished sack.

Technical Specifications

Procedure After an Automatic Stop

1. Keep the loom stopped and identify the cause;
2. Determine whether the issue is broken warp, broken weft, exhausted yarn or a signal fault;
3. Replace or reconnect the affected yarn;
4. Inspect the shuttle wheel, generator and receiver;
5. Readjust warp tension and detector distance;
6. Check shuttle movement in inching mode;
7. Mark the fabric around the abnormal section;
8. Resume continuous operation after verification.

FAQ

Does automatic stopping prevent every fabric defect?

No. It monitors specific warp and weft conditions. Fabric dimensions, density and surface condition still require inspection.

Does every automatic stop indicate a yarn break?

No. Receiver misalignment, excessive signal distance, generator failure or an unreleased emergency-stop button may also stop the loom.

Does this function provide anti-static chemical packaging?

No. Machine monitoring and finished-sack electrostatic performance are separate requirements.

Does the loom produce finished chemical powder sacks?

No. It produces tubular woven base fabric. Coating, lining, cutting, sewing and finished-product testing require downstream processes.

Founded in 1995, SINOPACK INDUSTRIES LTD. is a China-based manufacturer and exporter specializing in FIBC bulk bags, big bags and flexible industrial packaging products.

SINOPACK operates two FIBC manufacturing plants in Lianyungang, Jiangsu Province, China. The manufacturing facilities cover approximately 20,000 square meters, with an annual production capacity of approximately 1.5 million FIBC bags.

Our main products include:

• Standard FIBC Bulk Bags
• 4-Loop Big Bags
• U-Panel FIBC Bags
• Circular FIBC Bags
• Baffle / Q Bags
• Food-Grade FIBC Bags
• Type C Conductive FIBC Bags
• UN-Certified FIBC Bags
• Coated and Uncoated Bulk Bags
• FIBC Bags with PE Liners
• PP Woven Bags
• Geotextiles
• Multi-Wall Bags
• Polyethylene Bags
• Mesh Bags

SINOPACK supplies customized FIBC solutions for the packaging, storage and transportation of food ingredients, chemicals, minerals, agricultural products, construction materials, recycling materials and other dry bulk products.

FIBC dimensions, fabric weight, Safe Working Load, lifting loops, filling systems, discharge systems, liners, coatings and printing can be customized according to specific material and handling requirements.

SINOPACK maintains an internal quality inspection system covering raw materials, weaving, coating, cutting, sewing, liner installation and final product inspection.

Our products are primarily supplied to international markets, supporting importers, distributors and industrial users requiring reliable and customized bulk packaging solutions