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Hezbi paresentation
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- 2. • NAME# HAZBIELAHI CMSID# 23152 DEPARTMENT# BS TEXTILE 7TH 2
- 3. IMPROVING THERMOS PHYSIOLOGICAL COMFORT OFPOLYESTER/COTTON KNITS BY CAUSTIC AND CELLULASES TREATMENTS 3
- 4. Abstract;. Cotton is oneof the most commonly used fibers for making knitwear. Some of the limitations of pure cotton knits include their tendency to shrink relatively limited durability and wash and wear properties. In order to overcome these limitations knitwear are also produced from polyester and cotton blends. The objective of this study was to improve the thermo- physiological comfort properties of knits made from polyester/cotton blend through simple chemical and biological treatments. 4
- 5. Keywords ;. Comfort moisturemanagement cotton/polyester. 5
- 6. INTRODUCTION; Different fiber materialsoffer different types of comfort properties. However selection of fiber depends on a variety of factor. e.g polyester /cotton blended fabric rapidly gained importance mainly due to the fact that both the fibers when blended thus provide better properties than those provide by pure cotton or pure polyester fabrics. However the use of polyester /cotton in wear such as sportswear is still limited because of their lower moisture management capability 6
- 7. • Materials andmethod;. Fabric;. A polyester/cotton single jersey knitted fabric comprising 52% polyester and 48% cotton as in intimate blend . The area density of the fabric was 143g/m2. 7
- 8. • Chemicals;. The chemicalsemployed in this study are listed below. .Hostapal NI- extra , a non ionic detergent/emulsifying agent by clariant ,Pakistan .hydrogen per oxide (35% commercial grade ) by sitara peroxide Pakistan Ltd. .caustic soda by Engro chemicals Pakistan Ltd. .cellusoft a commercial grade cellulose enzyme by Novozyme, Pakistan. 8
- 9. Machinery and equipment; theequipments employed to excute this work are listed below. winch WD_100 by tsujii machine manufacturing co.Ltd japan moisture management tester by SDL Atlas ,uk. Air permeability tester by SDL ATLAS,uk. Brusting strength tester by james UK. 9
- 10. • FABRIC SCOURINGAND BLEACHING ;. The greige was washed at a temperature of 65c to emulsify the natural and added knitting oils and to remove any types of dust and dirt in it. The fabric was subjected to one-bath scouring and bleaching process at 90c for 40 min, using 6g/l hydrogen per oxide , 4 g/l caustic soda and 1 g/l stabilizer. The fabric was then rinsed with water at ambient temperature. And then followed by a hot wash at 95c for 20 min. 10
- 11. Fabric treatment withcaustic soda;. The polyester component of the p/c fabric under study was modified with caustic soda treatment. This treatment was performed at varying intensities. The difference in intensity was achived by changing the time of treatments with fixed caustic soda concentration and temperature.three bleached fabric samples were treated with 100g/l caustic soda at 95c for 10 ,20 and 30 min, respectively,followed by washing ,neutralizing , and drying in ambient air. 11
- 12. • Fabric treatmentwith cellulose ;. Similarly ,the cotton component in blend was modified with cellulose enzyme treatment.three bleached fabric samples were treated with 3g/l cellulose enzyme at 55c for 15,30,and 45 min. Respectively followed by washing and drying at ambient temperature. 12
- 13. • Results anddiscussion ;. • Effect of caustic and cellulose treatment on fabric air permeability ;. The effect of caustic and cellulose treatment on the air permeability of the treated fabric is shown in figure. The caustic treatment causes reduction in the diameter of the polyester fibers leading to increase porosity which improvise the air permeability of fabric .the cellulose treatment results in the removal of cotton fibers protruding out from the fabric surface . 13
- 14. • Conclusions ;. Theeffect of caustic and cellulase treatment on some aspects of thermos – physiological comfort of polyester/cotton knitted fabrics was studied.it was concluded that caustic treatment is very effective in improving fabric air permeability and moisture management properties of treated fabrics . While cellulose treatment is effective in fabric surface smoothening through removal of cotton protruding fibers. 14
- 15. • References ;. (1).Slater,k (1985).human comfort c.c Thomas . (2). Nida ,o.and arzu, m.(2007).thermalcomfort properties of some knitted structures.fibers and textiles in eastern Europe, (3).Das A ,Alagirusamy ,R., and Kumar ,p(2011).study of heat transfer through multilayer clothing assemblies ;a theortical prediction.autex research journal ,11,54-60. (4).yoon , H .and Buckley A. (1984).improvied comfort polyester ;transport properties and thermal comfort of polyester/cotton blend fabric textile research journal ,54(5),289-298. 15
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