The fabric shrinkage testing machine is an instrument specially used to test the shrinkage of fabrics. In the textile industry, shrinkage is one of the important indicators for evaluating the dimensional stability of fabrics after washing. This article will introduce in detail how to use a testing machine to test the shrinkage of fabrics, including preparations before the test, test process and result analysis.
Preparation before test:
Before conducting the fabric shrinkage test, some preparations need to be done. It is necessary to select appropriate test parameters according to the fabric material and thickness, such as test temperature, test time, etc. In addition, fabric samples and shrinkage testing machines need to be prepared. Fabric samples should comply with relevant national standards and are usually 10cm*10cm square. The sampling process should maintain the integrity and representativeness of the sample. The testing machine should be inspected and calibrated before testing to ensure its normal operation, and should be preheated to the corresponding temperature according to the test requirements.
The test process of fabric shrinkage testing machine:
- Prepare sample: Take 5 identical fabric samples, each sample is 10cm*10cm in size.
- Conduct the test: Put 5 fabric samples into the shrinkage testing machine and conduct the test according to the preset parameters. Normally, the test temperature is about 60°C and the test is completed within 45 minutes to 1 hour.
- Washing and drying: Take out the fabric samples after the test, wash and dry them. The same water temperature and detergent should be used during washing to ensure the same washing conditions for each sample. During the drying process, each sample should be dried at the same temperature and time, and a circulating air drying oven should be used to ensure that each sample is dried under the same temperature and humidity conditions.
- Calculate shrinkage: measure the length and width of each fabric sample after drying, and compare it with the data before the test. The calculation formula of shrinkage rate is: shrinkage rate (%) = (size before test – size after test) / size before test × 100%.
When conducting a fabric shrinkage test, it is necessary to conduct the test according to relevant national standards and evaluate the test results. Normally, the shrinkage rate should be controlled within a reasonable range to ensure the dimensional stability of the fabric during use. If the fabric shrinks too much, it may cause the fabric to lose its original design size and shape, and affect the appearance and quality of the fabric. In addition, the test results can also be used to evaluate the washing performance, durability and performance changes of fabrics.
The fabric shrinkage testing machine is an important instrument used to test the dimensional stability of fabrics after washing. Full preparation is required before the test, appropriate test parameters and fabric samples are selected, and the testing machine needs to be calibrated and inspected to ensure the accuracy and reliability of the test. The test process includes sample preparation, testing, washing and drying. The test results can be used to evaluate the shrinkage and washing performance of the fabric. Through rational use, it can provide strong support to the textile industry, thereby improving fabric quality and market competitiveness.