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Car hammer tensioning device: the tension roller is arranged in a movable tailstock small car, the weight by
Tensioning pulley car simple structure can maintain a constant tension in size may depend on the weight of the hammer, but its dimensions larger area and more massive.
Automatic tensioning device: it has a reasonable elastic deformation and plastic tension, automatic compensation strip elongation,
The disadvantage is a more complex structure, dimensions greater need for pollution-sensitive auxiliary driving means. In this issue of choice is a spiral tensioning device.
In summary, the work program of belt conveyors use an ordinary rubber band, tilt upward transport line arrangement, the driving part of the selection single drive roller, tensioning devices use a simple screw tensioning device.
In the rapid development of science and technology today, packaging materials and packaging technology is no longer a simple and intuitive thing, but those into the various disciplines of technology and the development of a functional packaging material. In this paper, food packaging materials commonly used in food packaging as well as some new material, and describes the characteristics and applications.
Keywords: food packaging materials barrier permeability and mechanical properties of water-soluble
From ancient times, food packaging materials have mushroomed continue to emerge, and with the development of science and technology is constantly updated and development. On food packaging materials has been a continuous human research, and constantly explore, continue to innovate and progress hot topic.