Denser knitwear fabrics block ultraviolet rays more effectively

Polly Chiu, Kwok Cheong Jimmy Lam

Research output: Publication in policy / professional / specialist journalArticle (for policy / professional audience)Academic researchpeer-review


Textile researchers in Hong Kong found that tightness factor and knit structure play an important role in preventing UV radiation from reaching the skin. Two sets of commercial knitted samples were used, using two machine gages, 5G and 12G. Three loop lengths of loose, normal, and tight stitch were examined. Seven sets of knitted fabrics in varied structures were examined in the second experiment. Tightness factor is very useful in setting up knitting machine and it is the ratio between yarn count and loop length. A higher value refers to tighter fabrics. Protection factor (PF) was used to quantify the UVR protection of fabrics. The PF indicates how much UVR is blocked by a textile material. Tightness factor of loosely and tightly knitted fabrics in the 5G samples increased from 1.373 to 1.57. The mean UPF increased from 15.653 to 32.294 respectively.
Original languageEnglish
Number of pages5
Specialist publicationATA Journal
Publication statusPublished - 1 Apr 2010

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Business and International Management
  • Materials Science (miscellaneous)
  • Polymers and Plastics


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