铝卷成卷前要做什么？

为了保证铝卷表面的清洁，在铝卷成型前应进行一些预处理。以免表面残留油脂和光顺剂，影响涂装和使用。因此，铝卷在成型前应进行以下几个方面的预处理。
首先，不妨用 铝卷热水清洗铝线圈。热水擦洗主要是将残留在基材表面的脱脂剂清洗干净，保证这些残留物能够溶解，从而防止这些脱脂剂对基材造成二次污染。使用方法主要有浸泡法和喷刷法。所用水的硬度不宜太高，否则水中的矿物质会在基材表面形成矿物斑点。
其次，由于 铝卷预涂线速度快，用于热碱脱脂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）、硅酸钠（Na2SiO3）、磷酸盐等成分。热碱脱脂过程通常分为两个步骤，以确保铝卷基板表面清洗干净，通常采用喷刷。

第三，它被钝化了。钝化处理是通过压力喷涂、浸涂或滚涂等方法在基体表面形成转化膜。钝化液使用过程中产生的污泥往往会堵塞喷孔，影响喷孔效率。虽然浸涂法可以解决这一问题，但钝化液的用量很大。以上两种方法在必要的操作中都需要水来清洗多余的钝化液，这将导致废水的回收和净化。辊涂法是一种很好的钝化施工方法，具有涂膜均匀、使用经济、不需清洗等优点。铬酸盐/氧化物型处理剂通常用于铝板，其中含有铬酸盐、铬酸、磷酸和助剂氟化物和钼酸盐。这种处理剂必须加入磷酸，否则不能用于处理食品和饮料铝板。
在去年的时间里，我国 铝卷材产品市场逐步好转，彩涂铝卷材一直稳步增长。铝线圈广泛应用于电子、包装、建筑、机械等领域，在刚刚过去的2012年，很多传统电子产品的外壳还是塑料的，价值可能要便宜很多，但使用寿命相对较短，而且外壳简单不好。因此，在未来的发展中，铝卷仍能占据一部分市场，铝卷生产企业的数量也将逐步增加。产品竞争将归结为技术竞争和品牌竞争。

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.

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.
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.
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. 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.
In last year's time, China's aluminum coil product market gradually improved, color coated aluminum coil has been steadily increasing. Aluminum coil is widely used in electronics, packaging, construction, machinery, etc. In the past 2012, many cases of traditional electronic products are still plastic, which may be much cheaper in value, but the life is relatively short, and the case is simple and bad. Therefore, in the future development, aluminum coil can still occupy a part of the market, and the number of aluminum coil manufacturers will gradually increase. The product competition will come down to skill competition and brand competition.