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铝卷成卷前的处理工作是怎样的?

来源:  发布时间:2021-04-20 14:43:08  

铝卷在成卷之前,需求做一些预处理工段,以保证铝卷表面的干净。免得其表面存在残留的油脂及光滑剂,对涂装及运用发生影响。所以,铝卷在成型前要对它进行下面几个方面的预处理。
In order to ensure the cleanness of the surface of the aluminum coil, some pretreatment sections should be done before the coil is formed. So as to avoid the residual grease and smooth agent on the surface, which will affect the coating and application. Therefore, aluminum coil should be pretreated in the following aspects before forming.
首先,不妨运用热水对铝卷进行洗刷。热水洗刷主若是将基板表面残留的脱脂剂洗刷干净,保证这些残留物能溶解当中,以防这些脱脂剂对基板形成二次污染。运用方式多为浸洗和喷淋刷洗的方式。所用水质硬度不要很高,不然,水中的矿物质会在基板表面生成矿斑。
First of all, you might as well use hot water to wash the aluminum coil. Hot water scrubbing is mainly to clean the residual degreaser on the surface of the substrate, to ensure that these residues can be dissolved, so as to prevent the secondary pollution of the substrate caused by these degreasers. The application methods are mostly immersion and spray brushing. The hardness of the water used should not be very high, otherwise, the minerals in the water will form mineral spots on the surface of the substrate.


其次,热碱脱脂由于预涂线线速较快,所以所用的脱脂剂通常浓度较高,典型的脱脂剂含有氢氧化钠(NaOH)、碳酸钠(Na2Co3)、水玻璃(Na2SiO3)、磷酸盐等组份。热碱脱脂工序通常分两步处理以确保铝卷基板表面洗刷干净,且多用喷淋刷洗的方式。
Secondly, due to the fast speed of precoating line, the degreaser used in hot alkali degreasing usually has a high concentration. The typical degreaser contains sodium hydroxide (NaOH), sodium carbonate (Na2CO3), sodium silicate (Na2SiO3), phosphate and other components. The hot alkali degreasing process is usually divided into two steps to ensure that the surface of aluminum coil substrate is washed clean, and spray brushing is often used.
再次,对它进行钝化处理。钝化处理是经过加压喷淋、浸涂或辊涂等方式使钝化剂在基材表面形成转化膜。通常运用加压喷淋的方式,钝化液在运用过程中发生的泥渣往往会拥塞喷孔,从而影响喷淋得功效。浸涂的方式尽管处理了这一问题,但钝化液的打发量较大。
Thirdly, it was passivated. Passivation treatment is to form a conversion film on the surface of substrate by pressure spraying, dip coating or roll coating. The sludge generated in the process of using passivation solution will often jam the spray hole, thus affecting the spray efficiency. Although the dip coating method can solve this problem, the amount of passivation solution is large.
以上两种方式在本质操纵中都需求用水清洗有余的钝化液,就会发生废水的收回和净化问题,辊涂是好的钝化施工方式,拥有涂布平均、经济适用、不需淋洗等优势。铝板通常选用铬酸盐/氧化物型处理剂,该类处理剂含有铬酸盐、铬酸、磷酸及促成剂氟化物和钼酸盐。该类处理剂一定加入磷酸,不然就不能用来处理食物和饮料用铝板。
Both of the above two methods need water to clean the excess passivation solution in the essential operation, which will lead to the recovery and purification of wastewater. Roller coating is a good passivation construction method, which has the advantages of average coating, economic application and no washing. Chromate / oxide type treatment agent is usually used for aluminum plate, which contains chromate, chromic acid, phosphoric acid and promoters fluoride and molybdate. This kind of treatment agent must be added phosphoric acid, otherwise it can not be used to deal with food and drink aluminum plate.

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