How to solve the wrinkling problem of hotel carpets?

The common quality defects in hotel carpeting include drumming, wrinkling, inconsistent color, and loose hotel carpets. Hotel carpets such as drums, wrinkles, in addition to the hotel carpet before the paving is not spread flat, the main reason is that when the paving tents uneven elastic and b

Heat treatment and cold treatment of die steel

Abstract: It is pointed out that the use of -196 °C liquid nitrogen cryogenic treatment for high-speed steel can significantly change the microstructure, effectively promote the transformation of retained austenite to martensite and the precipitation of ultrafine c