Measuring dimensional change in woven interlining involves comparing the size of a sample before and after it has been exposed to the relevant production process. The purpose is to identify potential changes while working with a small sample rather than discovering them after bulk production.
Start with a representative sample from the actual batch intended for use. Mark clear reference points in both the length and width directions and record the original measurements. The sample should then be exposed to the process it will experience during production. This can include the relevant fusing, pressing, washing, steaming or finishing conditions.
After processing, allow the sample to settle and cool fully before measuring it again. Use the same reference points and measurement method used at the beginning.
The result should be compared with the dimensional requirements of the garment. It is also useful to test the fused pair rather than looking only at the interlining because the outer fabric can behave differently from the interlining. The test conditions should reflect the actual production process wherever possible. There are no universal temperatures, durations or limits that apply to every situation because the appropriate conditions depend on the material, press and garment. A sample test therefore provides a process-specific result that can help determine whether the material should be approved, adjusted or changed before bulk production.
