Pesticide bag selection considerations

The composition of pesticides is more complex, there are water-soluble pesticides and oily pesticides, and the corrosive nature of the large differences, so in the pesticide bag selection and production must pay special attention.

At present, there is not a dry compound polyurethane adhesive can be applied to 100% of the pesticide bags in the world, without any delamination and leakage problems. It can be said that pesticide packaging on the overall requirements of the adhesive is relatively high, especially in the corrosion resistance, grease resistance, especially resistant to xylene and other solvents on the higher requirements.

Selection and production must pay attention to the following aspects:

1, the production of pesticide bag packaging prerequisite is the inner layer of composite substrate requires good barrier properties, can resist corrosion.

The matching of base film tension should be well controlled, which is an important means of preventing wrinkles, tunneling, but also to improve the yield, to ensure economic efficiency measures.

2, followed by the requirement of adhesive corrosion resistance. Adhesive preparation should be accurate, the proportion of the main agent and curing agent, the amount of diluent should strictly follow the provisions of the product specification, to be fully stirred before use.

Requirements for the amount of glue than other composite materials, a little more per square meter to 4.5 ~ 4.8 grams of dry glue, too little will affect the peeling force, too much and increase the cost.

Drying process is determined to control the amount of residual solvents, appearance and internal quality and labor productivity factors

5, production must be done to adapt to the test, that is, the production of good bags to package the pesticides to be packaged, and then placed into the ripening room at about 50 ℃ high temperature for a week, to see whether the bag is intact, if intact, it is basically determined that its packaging structure can hold this pesticide. If there has been delamination or leakage phenomenon, it means that this pesticide can not be packaged.

The control of residual solvents is very important, and it is hoped that it can reach less than 5mg/M2. Therefore, according to the above drying and start-up speed of the process parameters can not achieve this goal, it is necessary to make corrections.