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铝卷成卷前的处理工作

来源:http://www.jndclyyxgs.com  发布时间:2021-07-29 14:35:50  

铝卷在成卷之前,需要做一些预处理工段,以保证铝卷表面的清洁。以免其表面存在残留的油脂及润滑剂,对涂装及使用产生影响。所以,铝卷在成型前要对它进行以下几个方面的额预处理。
Before the aluminum coil is rolled, some pretreatment sections need to be done to ensure the cleanness of the surface of the aluminum coil. To avoid residual grease and lubricant on the surface, which will affect the coating and use. Therefore, the aluminum coil should be pretreated in the following aspects before forming.
一,可以使用热水对铝卷进行清洗。热水清洗主要是将基板表面残留的脱脂剂清洗干净,保证这些残留物能溶解其中,以防这些脱脂剂对基板造成二次污染。使用方式多为浸洗和喷淋刷洗的方式。所用水质硬度不要太高,否则,水中的矿物质会在基板表面生成矿斑。
1、 Hot water can be used to clean the aluminum coil. Hot water cleaning is mainly to clean the residual degreasing agent on the surface of the substrate to ensure that these residues can be dissolved, so as to prevent these degreasing agents from causing secondary pollution to the substrate. The use methods are mostly immersion washing and spray brushing. The hardness of the water used should not be too high, otherwise the minerals in the water will form mineral spots on the surface of the substrate.


二,热碱脱脂由于预涂线线速较快,所以所用的脱脂剂一般浓度较高,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。热碱脱脂工序一般分两步处理以确保铝卷基板表面清洗干净,且多用喷淋刷洗的方式。
2、 Due to the fast line speed of precoating, the degreaser used for hot alkali degreasing generally 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 generally divided into two steps to ensure that the surface of aluminum coil substrate is cleaned, and spray brushing is often used.
三,对它进行钝化处理。钝化处理是通过加压喷淋、浸涂或辊涂等方式使钝化剂在基材表面形成转化膜。一般使用加压喷淋的方式,钝化液在使用过程中产生的泥渣往往会堵塞喷孔,从而影响喷淋得效果。
3、 Passivate it. Passivation treatment is to form a conversion film on the surface of the substrate by means of pressurized spraying, dip coating or roll coating. Generally, pressurized spraying is used. The sludge generated during the use of passivation liquid often blocks the spray hole, thus affecting the spraying effect.
浸涂的方式虽然解决了这一问题,但钝化液的消耗量较大。以上两种方法在实际操作中都需要用水冲洗多余的钝化液,就会产生废水的回收和净化问题,辊涂是钝化施工方式,具有涂布均匀、经济实用、不需淋洗等优点。铝板一般采用铬酸盐/氧化物型处理剂,该类处理剂含有铬酸盐、铬酸、磷酸及促进剂氟化物和钼酸盐。该类处理剂必须加入磷酸,否则就不能用来处理食品和饮料用铝板。
Although dip coating solves this problem, the consumption of passivation solution is large. In practice, the above two methods need to wash the excess passivation solution with water, which will produce the problem of wastewater recovery and purification. Roll coating is a passivation construction method, which has the advantages of uniform coating, economy and practicality, no leaching and so on. Chromate / oxide treatment agent is generally used for aluminum plate, which contains chromate, chromic acid, phosphoric acid and accelerator fluoride and molybdate. This kind of treatment agent must be added with phosphoric acid, otherwise it can not be used to treat aluminum plates for food and beverage.