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Pinxiang corrugated board adhesive water resistance tester was successfully developed

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core tips in the preparation process of mixed ingredients: the strength of corrugated board under wet conditions will decrease rapidly, which is a worldwide problem. Developed countries have carried out long-term research and exploration in this regard, and have achieved remarkable results, At present, there are three recognized ways to fill polypropylene with straw with 10% and 0% of different contents:

[China Packaging News] the strength of corrugated board will decrease rapidly under wet conditions, which is a worldwide problem. Developed countries have carried out long-term research and exploration in this regard and achieved remarkable results. At present, there are three more effective and recognized ways:

1 Improve the water resistance of corrugated board binder (commonly known as paste or glue)

2. Improvement of inorganic filler in base paper making

3. The paperboard surface is coated with waterproof or moisture-proof agent

the latter two schemes are to add or brush a layer of special waterproof substances (such as wax, silicon, etc.) on the surface of the paperboard, so that when the paper fiber contacts water or moisture, it has low surface tension and forms a non wetting layer to water, so that the paperboard can achieve the waterproof effect, but it has no effect on the moisture in the bonding point inside the corrugated paperboard

in China, almost all corrugated board production lines use water-soluble corn starch (or cassava starch) as adhesive, and the diameter of starch particles is generally 4 ~ 50? m. The main component is carbohydrates (glucose compounds), which are insoluble in water. They expand with the rise of temperature in water, then break and gelatinize, and become a very viscous translucent liquid, resulting in strong adhesion

the advantages of corn starch adhesive are non-toxic, non corrosive, non polluting to the environment, wide sources of raw materials, low cost, simple manufacturing process, etc., but its poor water resistance is a very fatal defect

there is an important international standard to evaluate and measure the water resistance of corrugated board, that is, ISO 3038:1975 determination of water resistance of corrugated board adhesive (immersion method), which originated from the original West German industrial standard DIN 53133. It took more than 30 years for China to translate ISO 3038:1975 standard into gb/t, which came into effect on September 1, 2009

because the new national standard is released soon, there are very few third-party institutions that can do this formal test in China. According to the requirements of some high-end customers, our research and development center spent several months researching and testing experiments, and finally successfully developed the first corrugated board adhesive water resistance tester based on the requirements of the latest national standard. This new product was successfully developed and put into the market, It will provide strong technical support for China's high-end corrugated boxes to enter the global market and participate in international competition