Textile machinery is the core equipment of the textile industry, and the quality of its lubrication directly determines production stability and fabric quality. From spinning, weaving to knitting and dyeing, key friction pairs such as spindles, rings, needle beds, cams and guide rails operate at high speed and continuously, placing strict demands on lubrication. However, traditional liquid lubricating oils are prone to splashing, creeping and leakage under high-speed operation. Once oil contaminates yarns or fabric surfaces, it forms defects that are difficult to remove, leading to downgrade or even scrap. Taking textile machinery as its entry point, this article analyzes the causes of oil contamination in fabrics and introduces how molybdenum disulfide (MoS₂) solid lubrication technology avoids oil contamination at the source, together with the corresponding standard verification methods.

Textile Workshops: Main Sources of Oil Contamination

Textile workshops generally require a clean, constant-temperature and constant-humidity environment, and fabrics are extremely sensitive to contamination as they pass through machines at high speed. Oil contamination mainly comes from three sources: first, liquid oil at high-speed rotating parts (spindles, rollers, needle beds) is thrown off by centrifugal force, forming oil mist suspended in the air that subsequently settles and adheres to yarns and fabric surfaces; second, lubricating oil creeps and leaks along machine surfaces, causing contact contamination when fabrics pass by; third, under high-temperature conditions grease oxidizes and thins, aggravating dripping and sagging. For cotton spinning, wool spinning and chemical-fiber weaving, oil stain defects damage fabric cleanliness, affect dyeing uniformity and finishing results, and are a key focus of quality management. Therefore, minimizing oil generation while ensuring sufficient lubrication has become the core issue in the lubrication design of textile machinery.

Molybdenum Disulfide: Anti-Contamination Advantage of Dry Solid Lubrication

Molybdenum disulfide is a typical layered solid lubricating material. In its S-Mo-S layered structure, the layers are bonded by weak van der Waals forces with low shear strength, and the friction coefficient can be as low as 0.02~0.06 (in vacuum or inert atmospheres); within the layers, strong covalent bonds provide excellent high load-carrying capacity. Unlike liquid lubricants, MoS₂ participates in lubrication in the form of solid particles or dry films — it does not volatilize, splash or creep, fundamentally cutting off the path of oil migration to fabrics. Under boundary lubrication and extreme-pressure conditions, MoS₂ particles shear and spread on the friction surface to form a dense transfer film that isolates metal contact surfaces, significantly reducing friction and wear while keeping the contact zone dry and clean. In addition, MoS₂ is chemically stable and has a wide temperature resistance range, maintaining long-term lubrication in the dusty and warm environment of textile workshops while reducing re-lubrication frequency and downtime for maintenance.

Typical Applications in Textile Machinery

In textile machinery, MoS₂ is mostly applied in the form of solid dry films or grease additives: for lubricating spindles and rings to suppress high-speed oil throw and oil mist; for needle beds, needles and cams of knitting machines to prevent oil contamination of fabrics; for cams, connecting rods and bearings of air-jet and rapier looms to achieve long-term low-friction operation; and for guide rollers and chains of sizing and setting machines to maintain reliable lubrication in hot and humid environments. Key parts treated with MoS₂ dry films can run with "little or no oil", significantly reducing oil sources; even where grease is indispensable, MoS₂-containing greases provide more stable boundary lubrication at a lower addition level, reducing leakage risk and extending maintenance intervals.

Standards and Testing: Verifying Anti-Contamination and Lubrication Performance by Verifiable Methods

The quality of textile machinery lubricants and MoS₂ products can be verified through a series of standard methods. Product purity and quality indicators can be tested in accordance with GB/T 23271-2009 "Molybdenum Disulfide" and the supporting GB/T 23274-2009 "Molybdenum disulfide - Methods for chemical analysis"; the anti-wear performance of lubricants can be determined using the ASTM D4172 four-ball wear test method (corresponding to GB/T 3142) by measuring the wear scar diameter to compare the effect before and after adding MoS₂; the extreme-pressure load-carrying capacity can be assessed in accordance with ASTM D2783 four-ball extreme-pressure test (corresponding to GB/T 12583) by measuring the weld load to evaluate reliability under heavy-load conditions. Through this combination of standards, textile equipment maintenance teams can establish a quantitative evaluation basis that balances lubrication performance and fabric cleanliness requirements, rather than relying only on experience-based selection.

Conclusion

The core requirement of textile machinery lubrication is to ensure stable operation of high-speed friction pairs while avoiding oil contamination of fabrics and maintaining a clean production environment. With the low shear strength, high load-carrying capacity and dry lubrication characteristics derived from its layered structure, molybdenum disulfide eliminates the splashing and creeping of liquid oils at the source, providing a solution for textile workshops that balances lubrication performance and cleanliness. Combined with product standards and standard test methods such as the four-ball test, it helps textile enterprises make scientific selections and improve fabric quality and equipment reliability.