Vacuum coating machine to obtain smooth and high reflectivity film

Vacuum coating machine to obtain smooth and high reflectivity film

The vacuum resistance evaporation coating equipment uses the resistance heating method in a vacuum chamber to melt and vaporize the metal wire (aluminum wire) close to the resistance wire, and the vaporized metal molecules are deposited on the substrate to obtain a smooth and high reflectivity film. layer to achieve the purpose of decorating and beautifying the surface of the item.

Vacuum coating machine exhaust process and mechanical pump

The exhaust process is as follows: the mechanical pump first evacuates the vacuum chamber to a low vacuum state of less than 2.0*10-2PA, which provides the premise for the subsequent vacuuming of the diffusion pump, and then when the diffusion pump evacuates the vacuum chamber, the mechanical pump cooperates with oil diffusion The pumps are connected in series to complete the pumping action in this way.

Mechanical pump: also known as the backing pump, the mechanical pump is the most widely used low vacuum pump. It uses oil to maintain the sealing effect and relies on mechanical methods to continuously change the volume of the suction cavity in the pump to make the pumped container. The volume of the gas inside expands continuously to obtain a vacuum.

The exhaust system of the vacuum coating machine is an important part of the vacuum system of the coating machine

Vacuum main body - The vacuum chamber is different according to the requirements of the processed products, and the size of the vacuum chamber is also different. At present, the most used diameters are 1.3M, 0.9M, 1.5M, 1.8M, etc. The chamber is made of stainless steel. Rusty, solid, etc., there are connection valves in each part of the vacuum chamber, which are used to connect each air pump.

Auxiliary pumping system: The exhaust system is an important part of the vacuum system of the coating machine, which is mainly composed of a mechanical pump, a booster pump (mainly introducing the Roots pump), and an oil diffusion pump. This exhaust system is composed of "diffusion pump + mechanical pump + roots pump + cryogenic cold trap + polycold".

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