Frequently Asked Questions
Find answers to common questions about our polyester bag sewing thread, spun yarn and manufacturing services. For further technical or commercial inquiries, contact our team directly.
01
Q: What raw material are your bag sewing threads made of ?
A: Our industrial bag sewing threads are manufactured exclusively from 100% high-grade bright polyester staple fiber. This premium raw material delivers consistent tensile strength, excellent abrasion resistance and stable sewing performance, and is formulated with no unnecessary matting additives for enhanced purity and material safety.
02
Q: How does your bright polyester thread perform compared to standard semi-dull sewing thread ?
Compared to conventional semi-dull polyester thread, our bright fiber formula offers higher tensile strength, lower elongation at break and more uniform yarn evenness. It also meets stricter food contact material safety requirements, making it suitable for both heavy-duty industrial packaging and food-grade application scenarios.
03
Q: Which bag sewing machine brands are your threads compatible with?
Our threads are precision engineered for seamless compatibility with all major industrial bag closing machine brands, including Newlong, Fischbein, Union Special and Waig. The consistent diameter and twist stability ensure smooth yarn feeding, minimal skipped stitches and reduced machine wear on continuous high-speed production lines.
04
Q: What abrasion resistance performance can I expect from your sewing thread?
Our polyester bag sewing thread features excellent abrasion resistance thanks to its uniform fiber structure and precision two-for-one twisting process. It maintains stable strength even under continuous high-speed sewing and heavy sack loading conditions, effectively reducing breakage rates and packaging line downtime.
05
Q: What standard specifications of bag sewing thread do you offer?
We provide 7 standard models to cover diverse packaging needs: NE8/3, NE10/3, NE10/4, NE12/4, NE12/5, NE12/6 and NE20/6. Spool weights range from 150g to 10kg to suit different production scales and machine setups.
06
Q: What do the "NE" and ply numbers mean in your product model?
"NE" (Number English) is the standard cotton count system used to measure yarn fineness, where a higher number indicates a finer yarn. The number after the slash indicates the number of single yarns twisted together. For example, NE12/4 means 4 plies of NE12 single yarn twisted into one finished thread.
07
Q: Do your products comply with EU food contact material regulations?
Yes. Our bright polyester sewing thread complies with EU Food Contact Material Regulation (EC) No 10/2011. It is suitable for direct or indirect contact with dry food ingredients, grains and edible products. Full third-party test reports are available upon request with formal orders.
08
Q: What international certifications and compliance do your products hold?
Our products comply with REACH (EU) regulation for restricted substances and meet OEKO-TEX Standard 100 requirements. Our production facilities operate under an ISO 9001 quality management system. Complete certification documents can be provided for import customs clearance and client audit purposes.
09
Q: Do you support OEM / private label services?
Yes, we offer full OEM services including custom spool labeling, brand printing on outer packaging, and customized product documentation to match your brand identity and market positioning.
10
Q: Can customers arrange on-site factory visits?
We welcome clients to visit our production facilities in Xinxiang, Henan, China. Please contact our team at least 3 working days in advance to schedule a guided tour of our spinning workshops, twisting workshops, testing labs and finished product warehouses.