揭密瓦楞纸板在生产过程中采用暂时性防水剂处理后，具有暂时防水功能。当水短时间落于其上时，不沾湿而成水滴，能防止水浸透纸板。暂时性防水剂处理纸板工艺近十年来在我国各大纸箱厂均已应用。这种防水剂当初从日本引进，其日文字面为“拔水剂”。
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".
这种涂料早期用于织物纤维上，后来才用于纸板的处理。因此大多树纸箱厂就采用拔水剂的叫法。拔水剂是一种蜡乳液，固体含量一般为：48%～51%，它的大特点是在使用时可用30 倍左右的水稀释，然后涂布于正在成型的瓦楞纸板面上，经过150℃左右的温度干燥，纸表面纤维由于醋的包裹，而具有表面张力，形成对水不浸润的面层。
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.
当遇水时，水在这个纸板上不浸润，形成水滴滚落，从而达到防水的作用。但是，蜡对纸纤维的附着力并不好，特别是当拔水剂被稀释了30 倍以后，其固含量只有1.5～，纸表面纤维只有很薄一层被蜡包裹。另外由于蜡乳液中蜡的粒径一般都比通常的高分子乳液粒径大，要往纸纤维深处渗透也难，同时拔水剂一般对明矾一类化学品敏感，在纸表面往往很快破乳而沉淀下米，因此拔水剂中的蜡粒子绝大部分只在纸面上很薄的一层存在。
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，蜡容易被摩擦掉，露出无蜡包裹的纤维，防水效果大大降。为了增强蜡对纸纤维的附着力，在拔水剂中往往有松香衍生物或羧化高分子乳液，它们既对纸纤维有很好的粘附力，与蜡又有较好的相溶性。这样，它们的加入可促进蜡在纸纤维上的附着性，同时如果对蜡进行改性，如将其氧化、基化，也有类似作用，都可以使蜡对纸纤维的附着力增加。
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.
但是必须指出的是，就是增加了这些措施，拔水剂在这样的浓度下所形成的仍不是一个防水膜层，因此在遇到摩擦，如纸箱在搬运、堆码过程中遇摩擦，往往会使这一防水表面失去作用。这就是为什么把涂布拔水剂的这类纸箱定为暂时性防水纸箱。
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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