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公开(公告)号：US3727577A
公开(公告)日：1973-04-17
申请号：US3727577D
申请日：1971-05-27
Applicant: USM CORP
Inventor： MC GARR J , VORHAUER B
CPC classification number: B32B27/12 , B05C19/025 , B05D1/00 , B05D1/286 , B05D2252/02 , B05D2401/32 , B32B3/28 , B32B5/022 , B32B5/024 , B32B27/10 , B32B27/304 , B32B27/32 , B32B27/40 , B32B2305/026 , B32B2323/04 , B32B2327/06 , B32B2375/00
Abstract: A continuously operative coating machine electrostatically deposits heat activatable powdered polymers, for example polyurethane, on a release carrier which progressively passes through a heating zone. The powder is applied from an electrostatic fluidized bed employing a microporous wire cloth as both bed and charging grid. Deposited powder is transformed to a film which is brought into adhering relation to flexible sheet material such as a fabric to be coated. The carrier and the sheet material then pass over a cooling means where the film is solidified and bonded to the material and the unloaded carrier is returned for receiving further powder deposits. The powder bed may include compartments for successive application of different types of powder particles. An ionized zone preferably insures that the recirculated carrier is free from any residual positive or negative charge which might affect the charged powder particles to be deposited by the electrostatic fluidized bed. An alternative arrangement employs a reuseable release paper backed by a metallic flexible strip for transfer of the film to the sheet material. When either arrangement is operated without supplying sheet material, it may with slight modification be used to produce plastic sheeting per se.
Abstract translation: 连续操作的涂布机将热可活化的粉末聚合物（例如聚氨酯）静电沉积在逐渐通过加热区的释放载体上。 粉末从静电流化床施加，采用微孔丝布作为床和充电网。 将沉积的粉末转变成与待涂布的织物等柔性片材粘合的膜。 然后，载体和片材通过冷却装置，其中膜固化并结合到材料上，并且卸载的载体返回以接收另外的粉末沉积物。 粉末床可以包括用于连续施加不同类型的粉末颗粒的隔室。 电离区优选地确保再循环载体不含可能影响被静电流化床沉积的带电粉末颗粒的任何残留的正电荷或负电荷。 一种替代方案是使用由金属柔性带支撑的可再利用的剥离纸，以将膜转移到片材。 当任何一种布置在不提供片状材料的情况下操作时，可以稍微修改以用于生产塑料片本身。
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