How spun-polyester bag-closing thread is specified and selected ?
Here’s an article about how spun-polyester bag-closing-sewing thread is specified and selected across industries—and how the right choice of count, ply and model like (NE12/4, NE10/3, NE20/6, NE12/5, etc.) can directly boost your packaging line efficiency . And with further details questions, please contact with the sales team from Henan Deman Packing Co.,Ltd.
Spun-polyester thread combines high tensile strength, abrasion resistance, and low elongation—critical for high-speed bag-closing machines. But “one size fits all” doesn’t apply: the wrong count or ply leads to excessive breaks, downtime, and machine wear.especially like our company offering various kinds of bag sewing thread. it is worthy to read the article carefully.
NE Count (English Cotton Count): Indicates how many 840-yard lengths weigh one pound, per single. Higher NE (e.g. NE20) means finer single yarn; lower NE (e.g. NE10) means coarser.
Ply: Number of singles twisted together. E.g., NE12/4 = four strands of NE12 single twisted into one thread.
Resulting Thickness & Strength:
Thickness ∝ (ply × 1/NE count)
Strength ∝ (ply × single-yarn tenacity)
Thus NE20/6 is both finer (NE20) и more plied (6-ply) than NE10/3.
Different Thickness
Different Breaking Force
| Промышленность | Typical Bag Weight | Machine Speed | Recommended Thread Model | Key Benefits |
|---|---|---|---|---|
| Flour, Spices, Grains | 2–10 kg | 100–200 bags/min | NE10/3 or NE12/3 | Fine threads reduce feed friction; adequate strength for lighter loads. |
| Animal Feed, Seeds | 10–25 kg | 150–250 bags/min | NE12/4 or NE12/3 | Balanced toughness; minimal break rates at mid-speed. |
| Fertilizer, Chemicals | 20–50 kg | 150–300 bags/min | NE12/5 or NE12/4 | Extra-plied for heavy loads; resists abrasion from granular contents. |
| Cement, Minerals | 25–50 kg | 200–300 bags/min | NE12/4 NE10/4 or NE102/5 | Maximum tensile strength; withstands machine tension spikes. |
| Food & Pharma | 1–25 kg | 80–200 bags/min | NE10/3 (food-grade finish) | Meets FDA/EU food-contact standards; fine, neat seal. |
Bag Weight & Material
Heavier, dense products (cement, fertilizer) demand higher-ply threads (e.g., 5–6 ply).
Lightweight goods (flour, sugar) run smoothly on 3–4 ply threads.
Line Speed & Machine Type
High speeds (>200 bags/min) require both high tenacity and uniform diameter to avoid friction jams.
Confirm compatibility with your bag-closing machine (FISCHBEIN, NEWLONG, UNION SPECIAL, etc.)—especially lubrication level and twist direction.
Environmental Factors
Humidity, temperature and dust can affect thread elongation and static. Choose a twist/lubrication coating optimized for your site.
Regulatory & Food-Safety Needs
For direct or indirect food contact, specify FDA CFR Title 21 and EU 10/2011 compliance (often available in NE10/3 food-grade finish).
Cost vs. Break-Rate Trade-Off
Finer threads cost less per meter but may break more often under heavy loads.
Thicker, multi-plied threads cost more but deliver fewer stoppages—often lowering your total cost per sealed bag.
Reduce Downtime: Matching thread strength to bag load cuts break-off incidents by up to 70%.
Minimize Maintenance: Uniform diameter and optimized lubrication lower wear on tensioners and cutting knives.
Increase Throughput: A thread that feeds smoothly at high RPMs allows your machine to run at peak rated speed—no forced slow-downs.
Lower Scrap Rate: Consistent stitch formation prevents loose stitches or under-seals that lead to rejected bags.
Conclusion
Selecting the right spun-polyester closing thread is a balance of tensile strength, thickness, machine compatibility, and cost. By understanding the NE count and ply system—and matching models like NE10/3, NE12/4, NE12/5 ,NE10/4, NE12/6 NE20/7 or NE20/6 to your specific industry needs—you’ll achieve fewer breaks, faster cycle times, and lower total cost of ownership. Proper thread selection isn’t a minor detail; it’s a key lever for maximizing the performance and profitability of your entire packaging line.
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УПАКОВКА ДЕМАН
Ведущий производитель промышленных полиэфирных нитей премиум-класса. Основные продукты : Полиэфирная нить для пошива мешков. Полиэфирная пряжа.
