The low-temperature elastic recovery tester plays a crucial role in fields such as materials science and textile industry. It can accurately simulate the elastic performance of materials in low-temperature environments, providing strong basis for product quality control and research and development innovation. A deep understanding of its working principle and advantages is the key to mastering the application of this instrument. The core lies in creating a controllable low-temperature environment and applying predetermined deformation to the sample, followed by observing the recovery of the material after the deformation is withdrawn.

（1） Creating a low-temperature environment

The instrument is equipped with a professional refrigeration system, commonly using methods such as compressor refrigeration or liquid nitrogen refrigeration. Compressor refrigeration compresses refrigerant gas, causing it to evaporate and absorb heat in the evaporator, and then circulate to gradually reduce the temperature of the test chamber. It can achieve a wide temperature range control and is mostly suitable for the low temperature range from room temperature to medium low temperature, such as -30 ° C to 0 ° C, which is commonly used for testing low temperature ranges. Liquid nitrogen refrigeration relies on the low boiling point of liquid nitrogen. Liquid nitrogen is injected into the test chamber to absorb heat and vaporize, rapidly cool down, and can reach ultra-low temperatures such as -100 ° C or even lower. However, the cost of liquid nitrogen consumption is high and sufficient liquid nitrogen supply is required.

Regardless of the refrigeration method, it is equipped with precision temperature sensors to monitor the temperature inside the chamber in real time and feed back the data to the control system to ensure that the temperature remains stable near the set value with small errors, providing a constant low-temperature field for the experiment.

（2） Deformation application and revocation

During the experiment, the pre processed sample is placed on a specific fixture or platform and subjected to deformation such as tension, compression, or bending through mechanical devices. Taking stretching as an example, the motor drives the screw to pull the fixture, accurately controlling the stretching force and elongation, and pulling the sample to the preset strain state. The force value and displacement data during this process are accurately collected and recorded by sensors.

After the deformation is maintained for a period of time, the control system commands the mechanical device to release the fixture or move in the opposite direction to cancel the external force. At this point, the elastic potential energy stored inside the sample is released, prompting it to return to its initial shape. The instrument uses high-precision optical or displacement sensors to track the size and shape changes of the sample, record the elastic recovery process throughout the process, draw the recovery curve, and quantitatively analyze key indicators such as recovery rate and recovery time.

Precautions for using the low-temperature elasticity recovery tester:

1. Safe operation:

-Comply with the safety operating procedures of the equipment, prevent electric shock, protect experimental equipment, and avoid contamination of experimental samples.

-If the equipment malfunctions or is abnormal, immediately stop the test and follow the emergency handling procedures in the equipment manual for handling.

2. Equipment maintenance:

-Clean the surface of the equipment after each use, especially the laboratory and workbench.

-Regularly inspect and maintain equipment, including internal cleaning, lubrication, replacement of vulnerable parts, etc.

-According to the equipment manual requirements, regularly calibrate and verify the equipment to ensure the accuracy and repeatability of test results.

3. Environmental conditions:

-Keep the environment around the equipment clean and dry, and avoid damage to the equipment caused by dust, moisture, or chemicals.

4. Operating standards:

-Strictly follow the equipment operation manual or standard operating procedures to avoid equipment damage or inaccurate test results caused by misoperation.