Roots pump is a kind of rotary varactor vacuum pump, will only be used with backing pump with, in a wider range of pressure pumping speed, greatly to be pumping gas containing dust and water vapor is not sensitive, it is widely used in metallurgy, chemical industry, food, electronic plating, etc.
The production of vacuum aluminized products, whether in Europe or other countries, has increased substantially every year in recent years.
In the United Kingdom and west Germany, the production of vacuum aluminum plating is also developing rapidly. Take the smoke-covered aluminum paper as an example. The British use 100% rolled aluminum boxes nine years ago, but now 70% have been replaced by vacuum aluminized paper, the cost is lower by 3/10. Nearly half of west Germany’s smoke-coated aluminium paper is also made from vacuum coated aluminium paper.
The rapid development of vacuum aluminum plating in these countries, in addition to the large market demand for packaging materials, another important reason is that their products of vacuum aluminum plating are of good quality and have a large variety of designs and colors. In order to obtain high quality products and achieve good economic benefits, they have strict requirements on raw materials, good equipment performance and advanced technology.
Requirements for raw materials:
(1) paper base：
Paper is very important. It is directly related to the quality and cost of products after vacuum aluminum plating. Paper is wooden fiber, some factory hardwood fibers (80%), the paper used cork fiber (20%), in order to increase the strength of paper, paper pulp to increase the percentage of long fiber, the strength of the general paper is 5 kg/cm2, tear strength index in 70, more than pulp for chemical pulp, rather than the ground wood pulp, so that the paper yellowing.
(2) on the plastic mold base：
In addition, the coating should meet the following conditions. Solvents volatile, good transparency, gloss, strong adhesion, wear – resistant, dry – not sticky. It is important that the softness of the coating affects the packaging performance. The ingredients are two kinds of resins: acrylic acid and nitrocellulose. Five solvents: methyl-ethyl ketone, toluene, acid kuoyi, acetone, ethyl alcohol.
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