12S/4 1KG Spun Polyester Bag Closing Thread with 4-Ply Twisted Construction

MH Sewing Thread Factory

• 150,000m²

  Plant Area

• 35,000 tons

  Year Production

• 1,000+

  Workers

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About Ningbo MH

MH specializes in garment accessories and fabrics, offering high-quality solutions for the textile and home décor industries. With advanced automated warehousing, MH ensures efficient supply chain management and provides comprehensive after-sales support, exclusively serving businesses, not individuals.

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• 1999

  Since

• $871Million

  Annual Sales (2025)

• 40+

  Branch Offices

• 600+

  Office Staffs

Product Details

The 12S/4 1kg polyester bag closing thread is a heavy-duty industrial sewing thread ideal for sealing thick and heavy packaging bags. Made from high-tenacity 100% spun polyester, it offers strong knot strength and consistent stitch quality. The 4-ply construction ensures higher durability and performance under high-speed sewing, making it suitable for heavy-duty automatic and industrial bag closing machines.

MH 12s/4 spun polyester bag closing sewing thread is a 100% spun polyester industrial thread built on a 12s/4 yarn count, meaning four plies of 12s spun singles twisted into one balanced cord for seam closing on filled sacks.

MH supplies this 12s/4 thread for closing woven polypropylene sacks, kraft paper sacks and multi-wall paper bags holding grain, feed, cement, fertiliser, sand and chemicals. The thread winds on cones for continuous feed, and MH produces it in raw white as standard or in customer-matched Pantone shades, with private-label cone and carton printing available on custom production runs.

Key Selling Points

• Four-ply spun construction: The 12s/4 build of this spun polyester bag closing thread balances four plies into one cord, so seam strength stays even across a full cone instead of drifting as the thread unwinds.

• Staple-fibre grip: MH spins the thread from staple polyester rather than filament yarn, giving the bag closing thread a matte, slightly fuzzy surface that locks the chain stitch into woven and paper sack fabric.

• Stable under machine heat: Low shrinkage and good colour fastness let this polyester bag closing thread run through heated, high-speed sewing heads without the stitch line puckering or the shade shifting.

• Clean high-speed running: Uniform winding and a low-lint finish keep the thread feeding smoothly on industrial bag closing lines, reducing thread breaks and needle-area build-up during continuous operation.

• Colour and label customisation: MH matches bag closing thread to customer Pantone references or physical samples and prints private-label cones and cartons for buyers running their own packaging brand.

• Manufacturer-direct supply: MH produces this spun polyester bag closing thread in its own mill, so wholesale buyers deal with the manufacturer on repeat bulk orders rather than through a trading layer.

Features

• High tensile strength for extra-strong seams

• Low shrinkage, oil-free, and low lint for clean machine operation

• Excellent abrasion and chemical resistance

• Uniform winding for smooth high-speed sewing

Thread Weight & Recommended Machine Models

Customization

• Thread color: Pantone-based or customer samples

• Private label & logo: Available on cone or outer box

• Cone type: Plastic or paper

• Packing: 1kg/cone, 10 cones/carton or as requested

• OEM & ODM: Welcome for bulk orders

Usage

This thread is specially developed for sealing large and heavy packaging bags used in agriculture, industry, and bulk transportation.

• Woven PP bags, kraft paper sacks, and multi-wall paper bags

• Used for packing: grain, cement, fertilizer, sand, feed, seed, charcoal, and chemicals

Suitable for use with heavy-duty industrial bag closing machines, including fixed-type and high-speed sewing heads.