St. Francis Xavier’s College An investigation on our school team jersey material 濟記球衣の再生

 Chan Tak-wai, Iverson  Chang Siu-kei, Samson  Lui Ka-man, Thomas  So Kwok-ho, Kevin  Yeung Fu-ki, David

 Many new textile materials are invented  Many schools have chosen new materials for making their sportswear  To investigate if our school have to choose new textile materials to choose new textile materials

 SFXC P.E. uniform (Cotton 1) (Cotton 1)  PTSS P.E. uniform (Cotton 2) (Cotton 2)  Low-priced T-shirt (Polyester 1) (Polyester 1)  Nike Dri-fit (Polyester 2) (Polyester 2)

 To examine the performance of 4 kinds of textile materials in - deformation resistance - deformation resistance - moisture resistance - moisture resistance - water-keeping ability - water-keeping ability - wicking effect - wicking effect - desiccation ability - desiccation ability

 Good deformation resistance - materials can be used for more times - materials can be used for more times - not easily be broken - not easily be broken  Objective - examine the deformation resistance of the materials - examine the deformation resistance of the materials (with low extending rate, (with low extending rate, high recovering rate) high recovering rate)

 Procedure -Put a hook of 400g counterweights onto the plastic belt -Put a hook of 400g counterweights onto the plastic belt (To test for the extended length) (To test for the extended length) -Take the counterweight off from the belt -Take the counterweight off from the belt (To test for the recovered length) (To test for the recovered length)

 Error analysis and improvement 1. The ruler should measure from the middle of the fabric but not the corner 2. The ruler should measure the fabric when it is steady

 Best deformation resistance: Polyester 1

 Low moisture resistance - Water vapour diffuse away from the body easily - Water vapour diffuse away from the body easily  Objective - examine the resistance to vapour diffusion - examine the resistance to vapour diffusion (with great amount of water diffused out) (with great amount of water diffused out)

 Procedure - Put the fabric into the oven - Put the fabric into the oven ( ℃ ) (40 ℃ ) ( To dry the fabric completely) ( To dry the fabric completely) - Pour 10g water to the beaker - Pour 10g water to the beaker - Mount the beaker mouth with the dry fabric - Mount the beaker mouth with the dry fabric (by a rubber band) (by a rubber band)

 Error analysis and improvement 1. The fabric shouldn’t be touched by bare hand as the sweat will affect the result 2. The rubber band should hold the fabric tightly (if not, water vapour will diffuse out easily) (if not, water vapour will diffuse out easily)

 Lowest moisture resistance: Polyester 2

 Low water-keeping ability - the fabric can hold less water - the fabric can hold less water - make the students more comfortable - make the students more comfortable  Objective - examine the ability of holding water during motion - examine the ability of holding water during motion (with less water amount held) (with less water amount held)

 Procedure - Soak the fabric in water till saturation - Soak the fabric in water till saturation - Dehydrate the fabric by a centrifuge for 2 minutes - Dehydrate the fabric by a centrifuge for 2 minutes (to test for the water amount held) (to test for the water amount held)

 Error analysis and improvement 1. The fabric shouldn’t be placed so deep inside the centrifuge tube to prevent the absorption of the removed water 2. The result should be recorded when the reading on the balance is steady

 Lowest water-keeping ability: Polyester 2

 High wicking ability - The fabric can diffuse liquid water away quickly - The fabric can diffuse liquid water away quickly  Objective - examine the wicking effect - examine the wicking effect (with longer climbing distance of the colored solution) (with longer climbing distance of the colored solution)

 Procedure - Put 40mL of colored solution to a beaker - Put 40mL of colored solution to a beaker - Hang one end of the fabric to a ruler, another end was soak in the solution - Hang one end of the fabric to a ruler, another end was soak in the solution - Cover the beaker with aluminium foil - Cover the beaker with aluminium foil - Record the result after 10 minutes - Record the result after 10 minutes

 Error analysis and improvement 1. The mouth of the beaker should be mounted tightly in order to make a close system environment 2. A beaker should be used instead of test tube (the fabric may touch the inner wall of the test tube)

 Best wicking effect: Polyester 1

 Good desiccation ability - The fabric can evaporate the water from body quickly - The fabric can evaporate the water from body quickly  Objective - examine the drying ability - examine the drying ability (with more water diffused out from the fabric) (with more water diffused out from the fabric)

 Procedure - Soak the fabric in water till saturation - Soak the fabric in water till saturation - Place the fabric with aluminium basin in the oven (30 ℃ ) for 20 minutes - Place the fabric with aluminium basin in the oven (30 ℃ ) for 20 minutes

 Error analysis and improvement 1. The temperature of the oven should be 30 ℃ to imitate human’s skin temperature 2. The experiment should be done at the same environment as the humidity will affect the result largely

 Highest desiccation ability: Polyester 1

1. Best deformation resistance: Polyester 1 2. Lowest moisture resistance: Polyester 2 3. Lowest water-keeping ability: Polyester 2 4. Best wicking effect: Polyester 1 5. Highest desiccation ability: Polyester 1

 We have chosen the textile material- polyester 1 (low-priced T-shirt) instead of polyester 2 (Nike Dri-fit) as our school new sportswear material as our school new sportswear materialBecause… 1. Their performance in the tests are similar 2. But, their price have a big difference Polyester 1: $30 Polyester 1: $30 Polyester 2: $120 Polyester 2: $120

 Our latest experiment - Wear one of the 2 kinds of sportswear - Wear one of the 2 kinds of sportswear - Stick the filter paper at the back for absorbing sweat - Stick the filter paper at the back for absorbing sweat - Run for 20 minutes - Run for 20 minutes - Measure the mass of sweat absorbed - Measure the mass of sweat absorbed

 “Polyester fibers: Chemistry and technology (1971)” by Ludewig Hermann  “Chromatography (1965)” by Savidan, L.  “Cotton (1994)” Woodbridge, Renu Nagrath.   ber.htm  rs.htm  