Lab 3. Wicking Test
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University of Delaware *
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215
Subject
Material Science
Date
Dec 6, 2023
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docx
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Textile Wicking Test
Objectives:
1.
To understand wicking characteristics of textile fabrics.
2.
To grasp basic testing data analysis skills: mean, standard deviation and t-test
Wicking Test
What is the definition of wicking?
The ability of a fiber to transfer moisture along its surface
What impact would wicking property of textile fabric have on product performance and appropriateness for specific end uses?
The impact would be how fibers with good wicking characteristics can produce comfortable products because the moisture is pulled away from the skin by wicking to the outer surface of the fabric where evaporation can occur. Please calculate the mean and standard deviation of 3.5, 4.2, and 4.8.
0.65
Assume you conduct wicking test of two fabric samples. You have three replications for each sample. For sample 1, the results you obtain are: 4.3cm, 4.6cm, and 4.9cm. For sample 2, the results you obtain are: 4.9cm, 4.6cm, and 5.2cm. Please calculate the means and standard deviations of the wicking results of the two samples. Please conduct two-sample t-test (assuming equal variances of the two samples) to test the following hypothesis and compare wicking results. What is the p-value? Do you reject or not reject null hypothesis (use significant level 0.05). What is your finding? Null hypothesis (H0): there is no significant difference in wicking property between these two fabrics. µ
1
= µ
2
Alternative hypothesis (H1): there is significant difference in wicking property between these two
fabrics. µ
1
≠ µ
2
Wicking Test 1 (cm)
Wicking Test 2 (cm)
Wicking Test 3 (cm)
Mean (cm)
Standard Deviation
Fabric 1
4.3
4.6
4.9
4.6
0.3
Fabric 2
4.9
4.6
5.2
4.9
0.3
p-value = 0.287864135
Note: Since the alternative hypothesis is µ
1
≠ µ
2
, you should use two-tail p-value
Reject or Not Reject null hypothesis. (Please circle one. Note: you should reject null hypothesis if p < .05) Finding: The purpose of this test is to observe the speed that water moves in a fabric. Because wicking is used for moisture management, understanding the speed and distance of moisture is important to fabric performance, especially for high performance textiles used in athletic apparel.
Materials needed
:
2 fabric samples: 100% cotton and 100% polyester
3 strips of each fabric sample, each 1” x 10”. Cut the 10” side parallel to the warp direction. Food coloring (red, dark blue or green works best)
Stop watch or timer
Metric ruler
Beakers
Procedure
:
1.
Prepare dye solution in a 500 ml beaker. Add food coloring to make color dark enough to make the moisture observable on the fabric to be tested. 2.
On each sample, draw a line 1 cm from one end using a dark pencil or permanent marker.
3.
Attach the end of the fabric sample without the mark to a glass rod. Place the rod across
the top of a beaker so that the bottom of the strip with the mark is at least 1 cm above the bottom of the beaker. Repeat this for each of the three strips.
4.
Fill the beakers with the suspended strips to the marked line. Samples need to be submerged to the 1 cm mark in the prepared dye solution. Hold suspended for 5 minutes.
5.
After 5 minutes remove each strip and place on a paper towel. Immediately measure the distance the water has traveled up the strip from the 1cm mark. 6.
Report results as the average and standard deviation for the three samples.
Note: Always use at least three samples for each fabric to be tested. Thus, if you want to compare the wicking ability of three different fabrics, you will need to repeat the above procedure for each fabric.
Please report the result
Wicking Test 1 (cm)
Wicking Test 2 (cm)
Wicking Test 3 (cm)
Mean (cm)
Standard Deviation
Cotton
Polyester
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Please conduct t-test (two sample assuming equal variances) to compare the wicking property of cotton and polyester fabrics. Please write null hypothesis and alternative hypothesis. What is the p-value? Do you reject or not reject null hypothesis? What is your finding?
Null hypothesis (H0): Alternative hypothesis (H1): p-value = Finding:
Analysis. Please give some explanations your finding. Why do cotton and polyester fabrics have
significant or not significant wicking property?