Before (改善前)

In the case of medical plastic products that contain medicines and reagents, leakage of their contents is a fatal defect. In particular, in the case of plastic containers with screw fittings for medical use, if the fitting between male and female screws is small, or if the cross-sectional shape of the screws is inappropriate, the fitting force will be insufficient and liquid leakage will occur. In addition, an overrun may occur when the threads are fitted, and the thread may get over the thread, and the sealing performance of the mating part may be reduced, and the function as a container may not be achieved.

V

After (改善後)

By increasing the fitting allowance of the medical plastic container and reviewing the thread shape, the fitting force can be increased. Since the fitting force is increased, no unnecessary space is created in the gap between the container lid and the main body, and it is possible to prevent leakage of the contents. In addition, since the allowance for mating is increased, overrun exceeding the screw thread can be prevented, and high sealing performance can be maintained.

POINT(要約)

The fitting force can be increased by unifying the cross-sectional shape of the screw at the place where the lid and the body of the plastic container are fitted, and by increasing the amount of overlap. However, care must be taken that performing excessively would be a risk that smooth fitting may not be possible or abnormal noise may be generated.