The magnitude and duration of ironing pressure depend on the thickness of the material and the inherent characteristics of the raw material. Generally, thin and loose fabrics require low pressure and short ironing time, while thick and dense fabrics are the opposite. Fabric can't be ironed directly on the countertop, so it needs to be padded with a thin blanket. Wool products need to be covered with a wet cloth to keep the clothes clean and tidy and not reflective. The iron is the main tool for ironing clothes. China Han Dynasty had an iron ware, also called "fire bucket", which was a spoon for charcoal fire. Modern ironing is a soldering iron and carbon soldering iron (commonly known as charcoal fire wheel) which uses carbon as the heat source and uses bellows to raise the temperature. Since the 1950s, electric irons have been widely used. At the end of 1950s, the first generation of "three-collar machine" in China was successfully developed, which was used to bond and arc shirt collars. Britain invented a special bonding machine for hot-pressing bonding lining. Bonding machine has developed into two types, which can control time, pressure and temperature, and has become a new ironing tool to match the new sewing technology. For ironing semi-finished products and finished products, steam ironing machines such as molding, aeration and multi-station rotation and garment piece stretching machines have been applied. A suit steam ironing equipment can complete 12 kinds of final ironing and 18 kinds of intermediate ironing, such as sleeve ironing, body ironing and three-dimensional shaping. Make the product dry, hot stamping and dull. Modern ironing equipment and new technology have greatly improved the ironing quality of products.