When it comes to buying jersey knit fabric, knowing how to measure its stretchiness is crucial. The stretchiness of jersey knit fabric affects its comfort, fit, and durability. In this article, we will guide you through the key factors to consider when measuring jersey knit fabric stretchiness, ensuring you make an informed decision before purchasing.
Understanding the Importance of Stretchiness
Firstly, let’s understand why stretchiness is an essential factor when choosing jersey knit fabric. The stretchiness of jersey knit fabric is what allows it to move with your body, providing comfort and a snug fit. High-quality jersey knit fabrics with good stretch can prevent the fabric from sagging or stretching out over time, ensuring a longer-lasting garment. On the other hand, fabrics with low stretch may become loose and baggy after a few wears.
Types of Stretchiness
There are two types of stretchiness in jersey knit fabric: spandex and elastane. Both are synthetic fibers that add stretch and recovery properties to the fabric. The difference between them lies in their percentage of stretch:
1. Spandex: Also known as Lycra or elastane, spandex provides up to 400% of stretch. This type of stretchiness is perfect for activewear, yoga pants, and other tight-fitting garments that require a significant amount of flexibility.
2. Elastane: Elastane provides less stretch than spandex, usually around 150-200%. It is suitable for everyday clothing like t-shirts, dresses, and loungewear.
Measuring Stretchiness: The Elongation Test
The most common method to measure the stretchiness of jersey knit fabric is the elongation test. This test measures the percentage of the fabric’s length that can be stretched without breaking. Here’s how to perform the elongation test:
1. Cut a 2-inch wide strip of fabric from the jersey knit fabric you wish to test.
2. Measure the original length of the strip using a ruler or measuring tape.
3. Hold one end of the strip with one hand and stretch it with the other hand until it reaches 100% of its original length. This means you have stretched the fabric by half an inch.
4. Hold the stretched fabric for a few seconds to allow it to recover.
5. Measure the new length of the strip and calculate the percentage of elongation using the following formula:
Percentage of elongation = ((new length – original length) / original length) 100
The higher the percentage of elongation, the more stretchy the fabric is.
Factors Affecting Stretchiness
Several factors can affect the stretchiness of jersey knit fabric:
1. Fiber Content: The type of fibers used in the fabric can affect its stretchiness. For example, fabrics with a higher percentage of cotton may have less stretch than those with synthetic fibers.
2. Fabric Construction: The way the fibers are woven or knit together can impact stretchiness. A tight-knit jersey knit fabric may have less stretch compared to a loose-knit one.
3. Washing and Drying: The washing and drying process can also affect the fabric’s stretchiness. Some fabrics may shrink or lose their stretch after washing and drying.
4. Age: Over time, jersey knit fabric may lose its stretchiness due to wear and tear.
In conclusion, measuring the stretchiness of jersey knit fabric is an essential step in ensuring you purchase a fabric that meets your needs. By performing the elongation test and considering the factors that affect stretchiness, you can make an informed decision when choosing jersey knit fabric for your next project.
