Pretreatment section of aluminum coil roll
Before the aluminum sheet in coil is rolled, there are some pretreatment sections should be made to ensure that the surface of the aluminum coil is clean. In order to avoid the presence of residual oil and lubricants on the surface, the impact on painting and use. Therefore, the aluminum roll should be pretreated in the following ways before forming. First, hot water can be used to clean the pvc aluminum trim coil . Hot water cleaning is mainly to clean the degreaser residues on the surface of the substrate, to ensure that these residues can be dissolved in it, in order to prevent these degreasers from causing secondary pollution to the substrate. The way of use is mostly washing and spraying. The water quality is best not too high. Otherwise, minerals in the water will produce mineral patches on the surface of the substrate. Secondly, due to the fast linear speed of the pre-coating line, the degreaser used is generally of high concentration. Typical degreasers include...