Why lotion pumps can't rebound after pressing

First of all, it is necessary to check whether there is a problem with the lotion pumps spring. The effect of the spring on the piston cannot be ignored. If the spring is damaged, it will easily lead to the return stroke of the piston is not in place. slow.
 lotion pump
Secondly, check whether the thickness of the lotion pumps piston fits the body. During the movement of the piston, any trace of the gap will cause weak suction, and the material will not be pressed by the head. Since plastics have the properties of thermal expansion and contraction, normal pistons are very important to ensure the quality of lotion pumps.
Finally, let's analyze the body. In view of the scalability of the plastic, if the operation is inappropriate during injection molding, insufficient injection will cut off a thin layer of the body, resulting in uneven inner walls, and the piston is inevitably left during the stamping process Gaps, resulting in failure to discharge.