Cloth shrinkage testing is an important test in the textile industry, it can be used to detect the dimensional change of textiles during washing or drying. The results of cloth shrinkage testing can provide important information about dimensional changes and quality control of textiles. In this article, we discuss methods for interpreting and analyzing fabric shrinkage test results.
1. Shrinkage calculation and analysis
Fabric shrinkage is the percentage change in size of a fabric during washing or drying. The calculation formula for shrinkage rate is: shrinkage rate = (original size - size after washing or drying) / original size × 100%.
For example, if the original size of a piece of cloth is 100 cm, and the size after washing or drying is 90 cm, the shrinkage rate of the cloth is (100-90)/100×100%=10%.
The analysis and interpretation of shrinkage depends on the use and requirements of the textile. For some textiles, such as sheets and towels, shrinkage can be important because they need to match other items. For other textiles, such as clothing and drapes, shrinkage may not be as important because they generally do not need to match other items.
2. Standard comparison and analysis
Cloth shrinkage tests can be analyzed and interpreted according to specific criteria. For example, the American Textile Association (AATCC) and the International Textile Testing Society (ISO) have developed a number of standards for evaluating shrinkage and other properties of textiles. Comparing test results to these standards can help assess the quality and performance of textiles.
For example, the AATCC 135 standard stipulates that the shrinkage of cotton fabrics after washing should be less than 3%. If the shrinkage rate of a piece of cotton fabric is higher than 3%, it means that the quality of the cotton fabric does not meet the standard requirements.
3. Outlier identification and analysis
In fabric shrinkage testing, outliers, results that differ significantly from other samples, may occur. Outliers may be due to experimental error, measurement error, or other factors. When analyzing and interpreting results, attention needs to be paid to outliers to ensure the accuracy and consistency of test results.
For the found outliers, the following measures can be taken for analysis and interpretation:
- Retest: Outliers can be retested if conditions permit to ensure the accuracy of test results.
- Exclude outliers: If an outlier is due to experimental error or measurement error, it can be excluded from the dataset to avoid affecting the overall results.
- Further analysis: If the outlier is due to other factors, further analysis can be performed to determine its cause and correct the problem.
4. Results reporting and recording
The results of fabric shrinkage testing should be recorded and reported for subsequent analysis and comparison. Records and reports shall include the following information:
- Test date and time
- Sample number or name
- original size
- Dimensions after washing or drying
- Shrinkage calculation results
- Record and processing methods of outliers
It is important to ensure the accuracy and completeness of records and reports to help ensure the reliability and consistency of test results.
In conclusion, the interpretation and analysis of fabric shrinkage test results need to consider multiple factors, including shrinkage calculation and analysis, standard comparison and analysis, outlier identification and analysis, and result reporting and recording. By properly analyzing test results, it is possible to assess the quality and performance of textiles and ensure their compliance with various standards and requirements.