Spun Polyester Bag Closing Thread
High-strength, smooth-running threads built for heavy-duty bag closing and bulk packaging operations.
Product overview
Spun polyester bag closing thread from Mahalaxmi is purpose-built for high-volume industrial packaging applications such as FIBC, woven sacks, feed bags and fertilizer bags. The thread combines very low elongation with high modulus to deliver clean and consistent seams that withstand heavy load, rough handling and exposure during transport and storage.
Made from 100% continuous filament polyester with a spun surface, these threads provide excellent stitch formation even on coarse and abrasive fabrics. The micro-lubrication ensures smooth running through high-speed bag stitching machines, reducing breakage and friction and ultimately improving productivity and machine life.
With excellent resistance to ultraviolet rays, stain-free performance and colorfastness, the thread maintains its strength and seam integrity in storage yards, warehouses and open environments. It is available in multiple deniers and cone/reel formats to match customer requirements for FIBC stitching, bag mouth closing, bag hemming and reinforced seams.
Technical specification
| Tkt | Tex No. | Construction (Ply/Ne) | Breaking Strength (Kg) | Elongation Range (%) | Recommended Needles (NM) |
|---|---|---|---|---|---|
| 20 | 120 | 4/20 | 5.08 | 14 – 24 | 130 – 160 |
| 15 | 150 | 3/12 | 6.00 | 14 – 18 | 130 – 160 |
| 10 | 200 | 4/12 | 7.77 | 13 – 21 | 130 – 160 |
| 8 | 240 | 4/10 | 9.01 | 16 – 24 | 130 – 160 |
| 8 | 240 | 6/15 | 9.01 | 16 – 24 | 130 – 160 |
| 8 | 240 | 8/20 | 9.02 | 12 – 22 | 130 – 160 |
Key Features & Benefits
-
Very low elongation for neat seams
The high modulus structure ensures tight, uniform stitching with minimal seam distortion, even on high-tension bag closing machines.
-
High UV and weather resistance
Ensures durability of seams during transportation and outdoor storage, protecting the integrity of feed bags, FIBCs and fertilizer sacks even under prolonged sun exposure.
-
Smooth machine performance
Micro-molecular lubrication helps the thread glide through guide eyes, needles and existing stitch lines with minimal wear on machine parts — allowing long, continuous production runs.
-
Abrasion and friction resistant
Designed to handle coarse woven polypropylene, jute and geo-textile fabrics without fluffing, fuzzing or breaking, delivering reliable seam strength in high-friction environments.
-
Packaging and denier flexibility
Available in multiple ticket sizes and spool formats to suit different bag-closing and overedge machines, including reels for automated systems and cone formats for conventional sewing heads.
-
Colorfast and stain free
Resists fading and dye bleeding when in contact with contents or exposed to moisture, maintaining a clean, professional look on end products.
Typical applications
Our spun polyester bag closing threads are engineered for high-duty industrial use across the full range of bulk packaging and sack closing operations.
Sewing operations
- Overlock
- Coverstitch
- Flatlock
- Serger machines
- Multi-needle industrial stitching
Product Properties
| Property | Details |
|---|---|
| Composition | 100% Spun Polyester |
| Elongation | Very low – for high-tension stitch control |
| Lubrication | Micro-molecular finish for smooth machine performance |
| UV Resistance | High – suitable for outdoor storage and transport |
| Tensile Strength | High – ideal for heavy-duty and bulk-load applications |
| Packaging | Cones, reels and custom industrial-size formats |
| Colour Options | Standard white and select industrial shades (custom shades on request) |
Manufacturing Excellence
Mahalaxmi Threads leverages advanced manufacturing capabilities to ensure our textured polyester sewing threads meet the highest industrial standards:
-
Precision twisting and texturizing
deliver consistent thread diameter and bulk.
-
Finishing treatments
like lubrication reduce friction and extend needle life.
-
Standardized production protocols
maintain uniformity in tensile strength, elongation, and seam performance.
-
ISO 9001:2015 certified systems
ensure consistency, safety, and compliance for industrial-grade usage.
Why Leading Packaging & FIBC Manufacturers Choose Mahalaxmi
- Batch-to-batch consistency – Every spool is produced to stringent tolerances to ensure uniform performance and seam integrity across bulk runs.
- Improved production uptime – Low breakage and smooth running reduce stoppages and extend needle life in high-speed closing machines.
- Reliable performance in harsh conditions – Engineered for high-friction fabrics, long transport, and outdoor environments.
- Application support – Our team assists customers in specifying denier, ticket size, and spool type based on fabric thickness, tension and sewing line requirements.