Resulting in negative pressure generated Deformation.
This phenomenon, we have done a number of rapid aging test to be confirmed. If we put the 1.8% avermectin test pesticide in a plastic bottle, we tighten the lid and open a small hole in the lid to connect a U-shaped tube with some water. Then, we put this bottle of pesticide and its associated U-shaped tube into the 50 ° ± 2 ° C in the oven heat storage for 5 days, while the daily record U-tube surface height changes.

At the beginning of heating and after a period of time, due to the expansion of the liquid and air in the pesticide bottle, the bottle has a positive pressure. U-shaped tube and the bottle is lower than the liquid level with the outside atmosphere of the liquid surface. However, as time goes on, the liquid level difference gradually becomes smaller, 30 hours flush. Then, the liquid level with the atmosphere began to communicate with the bottle below the surface, which shows the bottle has begun to appear negative pressure. When the full five days out of the test pesticide and return to room temperature, the measured liquid level difference into a negative pressure -12.9 kPa (Kpa), when the oxygen content of the bottle from the original about 20% 21% to 5% to 7%. Several Methods to Solve Deformation

In view of the plastic bottle deformation is a common phenomenon, plastic bottle manufacturers need to work together with the pesticide manufacturers to explore and work to solve this problem.

First, to overcome the deformation caused by hot filling method. Very simple and very direct, as far as possible at room temperature filling. To achieve this goal, pesticide manufacturers can not reduce the reactor temperature, should take or extend the circulation pipeline or increase the cooling device to overcome. If these methods can not be achieved, it should be in the pesticide filling into the plastic bottle, the cooling to room temperature when it re-sealing sealing.

Second, because of mutual solubility, weight loss caused by the deformation of the solution. The main method is based on different solvents in EC pesticides, the use of different targeted barrier effect of plastic bottles, and in the selection before the compatibility test to be confirmed. In this case,
In general, the liquid pesticide of the water, suspension agent deformation of the situation less common plastic bottles are fully capable.
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