Compare Fabric Materials
Students examine different types of fabric and their characteristics. Using magnifying glasses and sandpaper, they test and observe the weave and wear quality of fabric samples. By comparing the qualities of different fabrics they come to understand why so many different types of fabric exist and are able to recognize or suggest different uses for them.
Some engineers design fabrics and other new materials. And other engineers incorporate those fabrics and materials into the products they design. For some product designs, durability over extended periods of time in rough conditions is important. Durable products do not have to be replaced as often, are typically more cost effective, and create less waste. Testing to understand the physical properties of fabrics aids in deciding their best use.
How to use a magnifying glass.
The structure of fabric.
Basic experimental testing skills.
3 different pieces of fabric, such as nylon stocking, light-weight cotton, denim
baseball or other small heavy ball
Fabric Wear and Tear Chart, one per student
What do you think your clothes are made of? With your neighbor, make a guess and then check the tags on your clothing to see if you are correct! (Give students time to do this. Write on the board the different fabrics they discover in their own clothing.)
How do you make your clothing choices? Do you go for fashion, function or comfort? Does your choice of clothing change based on the activity you are doing? What would you wear if you were skateboarding, running, playing baseball, ice skating or reading a book?
In today's activity you will study different types of natural and synthetic fabrics and their durability. Who knows, you may end up changing your choice of clothing!
A sudden advance in knowledge or technique; a point when a hole is made through a barrier.
A woven or knitted material/cloth.
A slender and long natural or synthetic unit of material (such as wool, cotton, asbestos, gold, glass, or rayon) usually able to be spun into yarn.
A lens that magnifies objects viewed through it.
Paper with rough material (like sand) fixed on one side and used for smoothing and polishing.
A thin fine cord formed by spinning and twisting short fibers into a continuous strand.
Damage, destruction or marks of use made by scraping or rubbing.
wear and tear:
The loss or damage that occurs to something during the course of normal use.
Any pattern or method of weaving; to make on a loom by lacing together threads going lengthwise with threads going crosswise.
Summary of Natural Fibers:
Cotton comes from a cotton boll plant. Woven cloth made of cotton breathes freely, making it comfortable to wear in many kinds of weather. It can be sewn, woven, heated and pressed easily into flannel or used to make knit fabric. Linen is another type of natural fabric. Linen comes from a flax plant. Linen wrinkles easily, but is lightweight, for optimal use in hot weather. Silk is spun by silk worms and can be either smooth or rough. Wool is made from animal hair. Fabric made of wool can provide tremendous warmth. Often, wool is combined with human-made fibers to make outdoor apparel for cold weather.
Summary of Synthetic Fibers:
Polyester is an example of a synthetic fiber used to make cloth. Polyester was popular when first introduced because of the ease of cleaning, durability and wrinkle-free appearance. However, unlike cotton, fiber made of pure polyester does not breath freely, trapping body heat and moisture, which can make it uncomfortable. Rayon is a more delicate fabric; its soft draping quality can look like linen. Rayon is more absorbent than polyester, so it is more comfortable to wear. Another fabric, nylon, is often a part of many fabrics that stretch, like undergarments and swimsuits. Acrylic is another material that can be made into fabric. Acrylic is often used as a wool substitute since it is warm and does not wrinkle easily. Often, acrylic is found in winter outdoor apparel.
Cut each fabric type into 4¼" x 11" pieces.
Make copies of the Fabric Wear and Tear Chart.
With the Students
Part 1: Observation
Divide the class into groups of two students each.
Give each group one piece of each type of fabric.
Have students use magnifying glasses to look closely at each fabric sample.
Instruct each group to draw what each fabric weave looks like on the data sheet.
Part 2: Fabric Wear and Tear
Give each group a baseball.
Have each group wrap one piece of fabric tightly around the ball and secure with a rubber band. (Note: The tighter the fabric is, the faster the experiment progress.)
Within each group, have one partner secure a piece of sandpaper (rough side up) on a table top, while the other partner drags the ball across it. DO NOT PRESS DOWN on the ball, just let the weight of the ball drag once across the sandpaper.
Use the magnifying glass to observe the area where the fabric was dragged across the sandpaper. Discussion question: Was there any wear after just one scrape?
Have students continue to test the fabric one scrape at a time. Make a tick mark on the data sheet for each scrape. After each successive scrape, examine the area with the magnifying glass, counting each scrape until you notice some wear on the fabric.
When students notice some wear on the fabric, have them tally and record the number of scrapes in the chart under "First Wear" for the tested fabric.
Have students continue scraping the fabric and counting each scrape until they notice a hole or tear.
Record the number of scrapes in the chart under "Breakthrough" for that fabric.
Repeat steps 6 -12 for each of the other two fabrics.
What makes fabrics different?
Which fabrics are the strongest?
Why do certain parts of your clothes, such as the knees of pants or the elbows of shirts, wear faster than other parts?
Which fabric needed the most scrapes to show the first signs of wear?
Which fabric needed the fewest scrapes to show the first signs of wear?
Which fabric lasted the longest between the first signs of wear and the breakthrough point?
Which fabric qualities do you think are the most important for the durability of the fabric? (For example, the type of fiber in the thread, strength of the thread, type or tightness of the weave.)
For a more challenging activity, add a discussion about the types of fabric and their various weave designs.
Roy, Richards. "An Early Start to Technology from Science." London, UK: Simon & Schuster, 1990, pp. 66-67.
The Best of WonderScience: Elementary Science Activities
. Albany, NY: Delmar Publishers, 1997, pp. 110.
"A Beginner's Guide to Fabrics." Cranston Village, Cranston Print Works. (natural fabrics, human-made fibers, types of cottons, types of silk, types of wool) Accessed July 24, 2001. http://www.cranstonvillage.com/interest/intfeatdetailart.aspx?id=642
Contributed ByCenter for Engineering Educational Outreach, Tufts University
Fabric Wear and Tear Chart (pdf)