Easy-open lid invented by the Americans, the system covered equipment so far, nearly 50 years of development history, after years of integration within the industry, major enterprises in the industry for the three companies in the United States and Slack. From a technical point of view, the easy-open lid system cover equipment and technology has been to improve material utilization, materials design and equipment of the reduction of the high-speed, efficient direction of development. Currently, the easy-open lid of the thickness of the aluminum declined by the beginning of 0.39mm to 0.24mm, lid diameter has narrowed from 211 cover type continuously changed to 206 cover type, 202 cover type, can lids declining weight, which greatly reduce the amount of single cans of supplies in order to reduce costs. At the same time, the speed of the system covered substantial increase in the 1970s, 650-1,000 per minute to produce only cover portfolio covered equipment system speed should be the level of more than 500 rushing times per minute, every minute of the production capacity has reached 2,000 cover above the highest reach the 3,000 level cap, low-speed devices suited to large-scale production of market demand gradually be eliminated by.

Slack Since its inception in 2004, has always insisted on the application of modern high-tech and innovative ideas for product development, positioning in the global market of high-end design and manufacture of special equipment. The company integrates R & D, design, production as a whole, the system covered equipment has reached the international advanced level of technical performance and overall performance.