tailieunhanh - Coatings Technology Handbook 2010 Part 4

Tham khảo tài liệu 'coatings technology handbook 2010 part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 19-6 Coatings Technology Handbook Third Edition Die Adjustment as It Relates to Manifold Design Precise coating weight control depends on the stability of the total system and on operator experience. Die performance will be at its best when a balance of pressure and flow is reached at the lip area. This balance is hard to define changes in materials and rate will affect it. We can best describe this through the voice of an operator when he talks about the die being jumpy or nervous in one case and lazy or unresponsive in the other. In the case of the jumpy adjusting die the pressure balance is too high with the lazy one pressure is too low. We will refer to this performance parameter as the operating window. When a die must be profiled excessively to improve end flow the operating window will vary across the die therefore the die adjusting characteristics will differ . jumpy center lazy ends . This effect is magnified in automatic control. When a die is set up at in. opening in the center and in. at ends to achieve balanced flow a 3 change in opening at the ends is in. and in the center it is a in. change. As we develop more dynamic computer programs to respond faster or to predetermine a target point uniform die response becomes very important. Coat Weight Adjustment Base coat weight is controlled by pump and line speed. Transverse area coat weight is a function of the lip gap adjustment. It is important to remember that the pump will always deliver a given amount of fluid to the web. When the operator adjusts the lip material is not taken away it is only moved from one place to another. This difference between roll or knife coating and slot die coating is often overlooked by the operator. Adhesive Selection Adhesives formulated for roll coating in some cases are not compatible with slot die heads. This is because roll coaters are high shear devices whereas slot dies develop low shear. Any fluid that requires very high .

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