纸张收到水份侵蚀后，瓦楞会发生垮塌软化现象，大大降低了包装安全性。然而大部分人理解中的纸箱防水仅仅是纸箱成型后的防水问题，却忽视了纸箱纸张本来存在的含水量问题。对于瓦楞纸板含水量的控制，应着重哪几方面控制呢？
瓦楞纸板防水防潮的目的，实际上还是为了维持纸箱的抗压性能，纸张收到水份侵蚀后，瓦楞会发生垮塌软化现象，大大降低了包装安全性。然而大部分人理解中的纸箱防水仅仅是纸箱成型后的防水问题，却忽视了纸箱纸张本来存在的含水量问题。事实上控制好瓦楞原纸含水量对提高瓦楞纸箱安全性能同样也是至关重要的。对于瓦楞纸板含水量的控制，应着重对以下几方面进行控制。
1.瓦楞原纸进厂时的含水量应严格按照gb13023-91标准进行检验。
2.进厂后对瓦楞原纸的储存温度应控制在常温状态，相对湿度不大于40%。
3.瓦楞原纸的存放应竖着码垛堆放，地面应做防潮处理。
4.瓦楞原纸的储存时间不宜过长。控制好瓦楞纸板生产过程中的温度温度是直接调整瓦楞原纸含水量，保证粘合剂糊化的重要条件。因此，当瓦楞纸板生产线在80米/分～120米/分时，通常采用的温度应控制在160℃～180℃之间，按其换算锅炉的饱和蒸汽压力应控制在0.9mpa-1.2mpa，这样既能调整好瓦楞原纸和单面瓦楞纸板的含水量，又能保证黏合剂的糊化。
为保证瓦楞纸板的强度和良好的粘合，对于瓦楞纸板的形成应根据瓦楞纸板生产线配置的不同进行必要的调整。
1.对于进入单面机的瓦楞原纸含水量控制在9%～12%之间时瓦楞成型最为理想。当瓦楞原纸含水量高于上述指标时，可采取加大预热面积或降低车速解决;当瓦楞原纸含水量低于上述指标时，可采取喷雾解决。笔者认为，单面瓦楞纸板通过快速输纸在天桥输送带上呈正∞型且堆积距离一致时，原纸和瓦楞原纸的水分调整的比较好，其含水量比较合适，单面瓦楞纸板在天桥上堆积的数量不宜过多，但为保证双面机不停机，在单面机换纸时单面瓦楞纸板在天桥上的堆积数量可适当增加。
2.烘干机的温度对瓦楞纸板的含水量影响很大。瓦楞纸板生产线加热段通常由三组(也有四组)组成，其加热板数量的多少是由加热板的尺寸及瓦楞纸板生产线的速度确定且每组均设有独立的控制阀门。为保证单面瓦楞纸板进入烘干机前的含水量基本一致，可采取调整单面瓦楞纸板在三重预热器上的预热面积的大小解决。其调整方法为：当含水量过高时，预热面积加大;当含水量过低时，预热面积减少。
After the paper is eroded by moisture, the corrugation will collapse and soften, which greatly reduces the packaging safety. However, most people understand that the waterproof of cartons is only the waterproof problem of cartons after forming, but they ignore the original moisture content of cartons. For the control of the water content of corrugated board, which aspects should be focused on?
The purpose of waterproof and moisture-proof corrugated board is actually to maintain the compression resistance of the carton. After the paper is eroded by moisture, the corrugated board will collapse and soften, which greatly reduces the packaging safety. However, most people understand that the waterproof of cartons is only the waterproof problem of cartons after forming, but they ignore the original moisture content of cartons. In fact, controlling the water content of corrugated base paper is also crucial to improve the safety performance of corrugated boxes. For the control of water content of corrugated board, the following aspects should be controlled.
1. The water content of corrugated base paper when entering the factory shall be tested in strict accordance with gb13023-91 standard.
2. After entering the factory, the storage temperature of corrugated base paper should be controlled at room temperature, and the relative humidity should not be greater than 40%.
3. The corrugated base paper should be stacked vertically, and the ground should be moisture-proof.
4. The storage time of corrugated base paper should not be too long. Controlling the temperature in the production process of corrugated board is an important condition for directly adjusting the water content of corrugated base paper and ensuring the gelatinization of adhesive. Therefore, when the corrugated board production line is 80 m / min ~ 120 m / min, the commonly used temperature should be controlled between 160 ℃ ~ 180 ℃. According to its conversion, the saturated steam pressure of the boiler should be controlled between 0.9mpa-1.2mpa, which can not only adjust the water content of the corrugated base paper and single-sided corrugated board, but also ensure the gelatinization of the adhesive.
In order to ensure the strength and good adhesion of corrugated board, the formation of corrugated board should be adjusted according to the different configuration of corrugated board production line.
1. For the corrugated base paper entering the single-sided machine, when the water content is controlled between 9% and 12%, the corrugated forming is the best. When the water content of corrugated base paper is higher than the above indicators, it can be solved by increasing the preheating area or reducing the speed; When the water content of corrugated base paper is lower than the above indicators, spray can be adopted. The author believes that when the single-sided corrugated board is positively ∞ shaped on the overpass conveyor belt through rapid paper transfer and the stacking distance is the same, the moisture content of the base paper and the corrugated base paper is adjusted better, and its moisture content is appropriate. The number of single-sided corrugated board stacked on the overpass should not be too much, but in order to ensure that the double-sided machine does not stop, the number of single-sided corrugated board stacked on the overpass can be appropriately increased when the single-sided machine changes paper.
2. The temperature of the dryer has a great influence on the water content of corrugated board. The heating section of corrugated board production line is usually composed of three groups (there are also four groups). The number of heating plates is determined by the size of heating plates and the speed of corrugated board production line, and each group is equipped with independent control valves. In order to ensure that the water content of single-sided corrugated board before entering the dryer is basically the same, it can be solved by adjusting the preheating area of single-sided corrugated board on the triple preheater. The adjustment method is: when the water content is too high, the preheating area increases; When the water content is too low, the preheating area decreases.
