彩涂板保护膜与蜡层分別有什么优点

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可剥性保护膜是一种背面经冷压预涂粘合剂的塑料薄膜。在室温下，通过一对复合辊直接与彩涂板复合。该膜为透明、薄的塑料保护层，成品后可剥离。可剥离保护膜与钢带的粘结是一种无溶剂复合工艺。该工艺不存在废气排放问题。它不需要一个庞大而复杂的热风废气处理装置。设备简单，节约了原材料，降低了能耗，维护成本低，效益显著。可剥离膜设备占地面积大，剥离时膜层易损坏涂层。但由于其技术成熟、操作简单、原料来源丰富，仍是大多数 彩涂板的首选保护方式。

蜡涂层是可剥离保护层的另一种结构形式。可剥保护层与蜡层功能互补。可剥膜可保护涂层板表面不受运输、环境、剪切和简单弯曲等异常因素的破坏。但对于滚轧成型后的彩涂板而言，可剥离膜有点弱。在冷弯过程中，由于施加在涂层板表面的压力，辊极易损坏保护膜。特别是当成型产品的横截面形状复杂时，由于横截面各部分的线速度和变形不同，容易损坏保护膜。这部电影更有可能被撕破。此时，如果用蜡涂层代替，不仅不会出现上述情况，而且在 彩涂板表面与滚筒之间也会形成润滑膜。喷蜡设备占地面积小，蜡层对涂层表面无损伤。然而，喷射温度难以控制，尤其是在北方地区使用时，由于气温较低，容易因凝固而引起喷射困难。每次使用前，必须清洁喷嘴。由于蜡是在室温下固化的，所以很难清洁出蜡机构。

Peelable protective film is a kind of plastic film which has been pre-coated with adhesive on the back by cold pressing. It is directly compounded with the coated plate through a pair of composite rollers at room temperature. The film is a transparent, thin plastic protective layer which can be peeled off after finished products. The bonding of strippable protective film and steel strip is a solvent-free composite process. This process does not have the problem of exhaust gas emission. It does not need a huge and complex heating blast exhaust gas treatment device. The equipment is simple, the raw material is saved, the energy is reduced, and the maintenance cost is low, so the benefit is remarkable. Peelable membrane equipment covers a large area, and the film layer is liable to damage the coating when peeling. However, due to its mature technology, simple operation and abundant material sources, it is still the preferred protection mode for most color coating plants.

Wax coating is another construction form of peelable protective layer. The peelable protective layer and wax layer are complementary in function. Peelable film can protect the surface of coated plate from damage caused by abnormal factors such as transportation, environment, shear and simple bending. But for the color coated sheet after roll forming, the strippable film is a little weak. During the cold bending process, the roll is easy to damage the protective film because of the pressure applied on the surface of the coated sheet. Especially when the shape of the cross section of the formed product is complex, because the linear velocity and deformation of each part of the cross section are different, the protective film is easy to be damaged. The film is more likely to be torn. At this time, if the wax coating is used instead, not only the above situation will not occur, but also a lubrication film can be formed between the surface of the color coating plate and the roller. Wax spraying equipment occupies a small area, and the wax layer has no damage to the coating surface. However, the spraying temperature is difficult to control, especially when used in northern areas, because the air temperature is low, it is easy to cause spraying difficulties due to solidification. And before each use, the nozzle must be cleaned. Because the wax is solidified at room temperature, it is difficult to clean the wax spraying mechanism.