揭密瓦楞紙板在生產(chǎn)過程中采用暫時性防水劑處理后，具有暫時防水功能。當水短時間落于其上時，不沾濕而成水滴，能防止水浸透紙板。暫時性防水劑處理紙板工藝近十年來在我國各大紙箱廠均已應(yīng)用。這種防水劑當初從日本引進，其日文字面為“拔水劑”。
The uncovering corrugated board has a temporary waterproof function after being treated with temporary waterproof agent in the production process. When the water falls on it for a short time, it is not wetted and becomes water drops, which can prevent water from soaking the paperboard. In recent ten years, the temporary waterproof agent process has been applied in the major carton factories in China. This kind of waterproof agent was originally introduced from Japan, and its Japanese literal is "water drawing agent".
這種涂料早期用于織物纖維上，后來才用于紙板的處理。因此大多樹紙箱廠就采用拔水劑的叫法。拔水劑是一種蠟乳液，固體含量一般為：48%～51%，它的大特點是在使用時可用30 倍左右的水稀釋，然后涂布于正在成型的瓦楞紙板面上，經(jīng)過150℃左右的溫度干燥，紙表面纖維由于醋的包裹，而具有表面張力，形成對水不浸潤的面層。
The coating was used in the early days on fabric fibers and later in paperboard. Therefore, most of the tree carton factory on the use of water drawing agent. Water extraction agent is a kind of wax emulsion, solid content is generally 48% to 51%, its biggest feature is that it can be diluted about 30 times water when used, and then coated on the corrugated board surface. After 150 degrees Celsius drying, the surface of the paper is wrapped with vinegar and has low surface tension to form a surface layer which does not infiltrate water.
當遇水時，水在這個紙板上不浸潤，形成水滴滾落，從而達到防水的作用。但是，蠟對紙纖維的附著力并不好，特別是當拔水劑被稀釋了30 倍以后，其固含量只有1.5～，紙表面纖維只有很薄一層被蠟包裹。另外由于蠟乳液中蠟的粒徑一般都比通常的高分子乳液粒徑大，要往紙纖維深處滲透也難，同時拔水劑一般對明礬一類化學品敏感，在紙表面往往很快破乳而沉淀下米，因此拔水劑中的蠟粒子絕大部分只在紙面上很薄的一層存在。
When encountering water, the water does not infiltrate on the paperboard, forming water drops to roll down, so as to achieve the waterproof effect. However, the adhesion of wax to paper fiber is not good, especially when the drawing agent is diluted 30 times, its solid content is only 1.5 ~, and the paper surface fiber is only a very thin layer wrapped by wax. In addition, because wax particles in wax emulsion are generally larger than the size of ordinary polymer emulsion, it is difficult to infiltrate into the depths of paper fibers. At the same time, the water absorbent is generally sensitive to alum chemicals, and it often breaks down quickly on the surface of paper.
在有外摩擦力的作用下，蠟容易被摩擦掉，露出無蠟包裹的纖維，防水效果大大降。為了增強蠟對紙纖維的附著力，在拔水劑中往往有松香衍生物或羧化高分子乳液，它們既對紙纖維有很好的粘附力，與蠟又有較好的相溶性。這樣，它們的加入可促進蠟在紙纖維上的附著性，同時如果對蠟進行改性，如將其氧化、基化，也有類似作用，都可以使蠟對紙纖維的附著力增加。
Under the action of external friction, the wax is easy to be rubbed off, revealing the fiber wrapped without wax, and the waterproof effect is greatly reduced. In order to enhance the adhesion of wax to paper fibers, there are often rosin derivatives or carboxylated polymer emulsions in the water extraction agent. They have good adhesion to paper fibers and good solubility with wax. In this way, their addition can promote the adhesion of wax to paper fiber. At the same time, if the wax is modified, such as oxidation and basification, the adhesion of wax to paper fiber can be increased.
但是必須指出的是，就是增加了這些措施，拔水劑在這樣的濃度下所形成的仍不是一個防水膜層，因此在遇到摩擦，如紙箱在搬運、堆碼過程中遇摩擦，往往會使這一防水表面失去作用。這就是為什么把涂布拔水劑的這類紙箱定為暫時性防水紙箱。
However, it must be pointed out that even with the addition of these measures, the water-proof coating formed by the water drawing agent at such a concentration is still not a waterproof film. Therefore, in case of friction, such as the friction in the process of handling and stacking of cartons, the waterproof surface often loses its function. This is why the coating agent of this type of cartons as temporary waterproof cartons.
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