At a preset temperature, the change in the shrinkage length and the heat shrinkage force of filaments and yarns are two important parameters in industry and technology.
 The specially designed box heater can avoid the influence of the surrounding environment. Together with the high-resolution length detection sensor and force sensor, after the sample is placed, the test will be automatically completed under computer control to avoid human error.
 During the testing process, the thermal shrinkage changes of the yarn will be displayed in the graph connected to the computer, and the testing results can be fully analyzed and evaluated.