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TENSILE PROPERTIES OF COTTON POLYETHYLENE BLENDS: A REVIEW George Ruppenicker 1 , Paul S. Sawhney 1 , Jayaram Subramaniam 2 , Kumar V. Singh 3 , and, Su-Seng Pang 2 ,

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TENSILE PROPERTIES OF COTTON POLYETHYLENE BLENDS: A REVIEW

George Ruppenicker1, Paul S. Sawhney1, Jayaram Subramaniam2, Kumar V. Singh3 , and, Su-Seng Pang2,

1Southern Regional Research Center, ARS/USDA New Orleans, LA 70124, 2Louisiana State University, Baton Rouge, LA, 70803, 3Miami University, Oxford, OH, 45056.

OBJECTIVES

YARN STRENGTH TEST DATA

FR-TREATED FABRIC TEST DATA

  • Study the requirements of various mechanical and physical properties of fabrics used in military and industrial applications.
  • Study various natural and synthetic fibers that meet these requirements.
  • Review the physical and mechanical properties of cotton/HT-polyethylene blend yarns and fabrics and compare them with 100% cotton equivalents.
  • Study the effects of common cotton flame-retardant (FR) coatings on the mechanical behavior of cotton/polyethylene blends.

MILITARY TENTS AND REQUIRMENTS

FABRIC TENSILE STRENGTH TEST DATA

CONCLUSIONS

  • The study shows that cotton/polyethylene blends have far superior tensile and tear strengths, compared to pure cotton fabrics.
  • The flex-abrasion resistance of cotton polyethylene blends increases with the increase in percentage of polyethylene.
  • The nitrogen-phosphorous FR coating on the blend does not affect the tensile and tearing strengths of the fabric
  • However, the abrasion resistance of FR-treated fabric drastically reduces, which is a reason for concern.
  • Further studies of the modifications of properties of cotton/polyethylene blends can help in the revival of the market for cotton in military and industrial applications.
  • Tent structures are mobile, light-weight, temporary shelters.
  • The skeleton is made of flexible but strong members based on load-bearing requirements.
  • The use of a light-weight fabric is a primary concern.
  • The fabric must possess properties, such as high wet strength, natural water resistance, breathability, and fire retardancy.
  • Good tensile strength, tear strength, and wear resistance (durability) are essential mechanical properties

FABRIC TEAR STRENGTH TEST DATA

COTTON /DYNEEMAR BLENDS

REFERENCES

FLEX-ABRASION RESISTANCE DATA

  • Dyneema is a high-tenacity, gel-spun polyethylene fiber with long, parallel and dense molecular chains. Ultra drawing of the gel forms the strong molecular chains. The fiber has a tenacity of over 315gf/tex and it is 15 times stronger than cotton.
  • Dyneema can be intimately blended with cotton and spun on a ring spinning frame. Cotton/Dyneema blends inherently are not fire- retardant or -resistant. A special chemical finishing of the (blend) fabric is required.
  • Blends containing 10%, 20% and 30% Dyneema and the rest cotton were investigated.
  • Mechanical properties of the blend yarns and fabrics were compared with those of pure cotton.
  • A comparative study of the effects of fire-retardant coatings, such as Antimony-Halogen and Nitrogen-Phosphorous, on the strength properties of the blend fabrics.
  • “Flame retardant fiber blend containing fibers” A.J Rosenthal, et al. Patent 4035542, Filing date: May 16, 1974, Issue date: Jul 12, 1977.
  • DSM High Performance Fibres, The Netherlands, “Properties of Dyneema HPPE Fiber, technical brochure”,1994.
  • U.S. Federal Supply Service, GSA, Federal Standards for Textile Methods, No. 191A:Method 5903, 1978
  • American Society for Testing and Materials, ASTM Designations: D1424-83, D1578-78, D1682-64 (1975), D2256-80, D3885-80
  • Isaacs, J.L, The oxygen Index Flammability Test., J.Fire and Flammability 1:36-47,1970
  • Hendrix, J.E Drake, GG.L Jr and Reeves. W. A., “Effects of Temperature on oxygen Index Values, Textile Res Journal, 41:360, 1971.

FLAME-RETARDANCY TEST DATA