Which Interlacing Levels of Polyester Yarn DTY (SIM, LIM, or HIM) are Best for High-Speed Circular Knitting?

In the global textile supply chain, the efficiency of high-speed circular knitting machines is heavily dictated by the mechanical properties of the yarn. Polyester yarn dty (Draw Textured Yarn) is the backbone of modern apparel, but its performance on the loom depends on "interlacing"—the process of using air jets to create knots or tangles in the filament. Hengke Textile Technology Co., Ltd., headquartered in Zhejiang with a strategic presence in Jiangsu, has built a multi-million dollar reputation under the leadership of Mr. Daniel Wang. We specialize in providing transparent, high-quality AA grade polyester dty wholesale solutions, ensuring that our clients receive the exact interlacing specifications required for industrial-scale manufacturing.

1. The Technical Role of Interlacing in High-Speed Knitting

Interlacing is essential to prevent filament breakage and "snowing" (lint accumulation) during high-speed tension changes. For 75d/72f polyester dty yarn, the air-jet pressure determines whether the yarn is Non-Intermingled (NIM), Slightly Intermingled (SIM), Lightly Intermingled (LIM), or Highly Intermingled (HIM). In circular knitting, the goal is to balance the yarn's "slinkiness" with enough structural integrity to pass through the needles without snagging. Using a high tenacity polyester dty for knitting ensures that the knots remain stable under the high RPM of modern machinery.

While NIM yarn offers the softest hand feel, it lacks the knot stability required for high-speed processes, whereas HIM yarn provides maximum stability but can result in visible "pin-point" textures on the fabric surface.

Source: ISO 2062:2024 Textiles — Yarns from packages — Determination of single-end breaking force and elongation at break

2. Why LIM is the Preferred Choice for Circular Knitting

For most polyester yarn dty applications in high-speed circular knitting, Lightly Intermingled (LIM) yarn is the "Goldilocks" solution. It provides sufficient cohesion to prevent the individual filaments of a 150d/48f polyester dty semi-dull yarn from separating, yet the knots are small enough to disappear during the dyeing and finishing stages. Recent technical breakthroughs in 2024 have introduced "Soft-Knot" technology, which allows LIM yarn to maintain its integrity during knitting while ensuring the fabric remains perfectly smooth after heat setting.

Compared to SIM, LIM yarn significantly reduces machine downtime caused by needle clogging, but it avoids the "roughness" associated with the heavy nodes found in HIM yarn.

Source: OEKO-TEX Standard 100: 2025 Requirements for Synthetic Filament Yarns

3. HIM for Specialized Warp and Technical Applications

Highly Intermingled (HIM) yarn is typically reserved for warp knitting or specific technical circular knits where the yarn undergoes extreme tension. For dope dyed black polyester dty yarn, HIM ensures color consistency and prevents "white spots" caused by uneven filament tension. According to 2024 market statistics from the International Textile Manufacturers Federation, the demand for HIM DTY in technical sportswear has increased by 12% due to its superior processing speed and durability during heavy-duty laundering.

HIM yarn provides the highest level of knot stability, which is essential for heavy-denier fabrics, but it might require more aggressive softening agents during post-processing compared to LIM or SIM yarns.

4. Quality Assurance at Hengke Textile Technology

At Hengke Textile Technology, we understand that "Production Speed" must be matched by "Quality Practices." Our polyester yarn dty undergoes rigorous testing for Uster evenness and knot frequency. Whether you are sourcing AA grade polyester dty wholesale for the Southeast Asian garment market or technical fibers for the West, our holistic approach ensures that the interlacing level is optimized for your specific machine gauge and RPM settings.

Conclusion: Optimizing Your Knitting Output

In conclusion, while the choice between SIM, LIM, and HIM depends on the final fabric requirement, LIM remains the superior choice for high-speed circular knitting due to its balance of processability and aesthetics. By partnering with a renowned player like Hengke Textile Technology Co., Ltd., you benefit from our expertise in polyester yarn dty and our commitment to transparent, multi-million dollar business standards. We look forward to providing the high-performance yarn solutions that drive your success in the textile industry.

Frequently Asked Questions (FAQ)

• Can I use SIM yarn for high-speed circular knitting?
  It is possible but risky. SIM yarn is more likely to cause filament breakage at speeds exceeding 25-30 RPM, leading to lint buildup and fabric defects.
• How do I measure the interlacing level of polyester yarn dty?
  Technicians typically use the "pin-count" method or electronic intermingle testers to determine the number of knots per meter (KPM).
• Does interlacing affect the dyeing of 75d/72f polyester dty yarn?
  Yes. If the knots are too tight (HIM), dye penetration may be slightly lower at the knot core, though modern "soft-knot" techniques have largely mitigated this.
• What is the difference between Semi-Dull and Bright DTY in terms of interlacing?
  While the luster differs, the interlacing process is the same. However, 150d/48f polyester dty semi-dull is the most common choice for matte-finish sportswear using LIM.
• Why choose AA Grade for wholesale?
  AA grade polyester dty wholesale ensures zero broken filaments, consistent oil content, and uniform interlacing, which are critical for maintaining high-speed knitting efficiency.