Why can't I rebound when I press the lotion pump?

Why can't I rebound when I press the lotion pump?

In order to avoid this situation, in the production process, we should first check whether the spring length is standard, and the difference is a thousand miles away. The effect of the length on the piston cannot be ignored. If it is short, it will cause the piston to return in place. After directly pressing the head down, it can't rebound or the rebound is slow.
 
Secondly, check whether the thickness of the piston fits the body. During the movement of the piston, any trace of air gap will cause inhalation and inability to press the head out of the material. Because plastic has the properties of thermal expansion and contraction, a normal piston is very important to ensure the quality of the emulsion pump.
 
Finally, we analyze the body. In view of the scalability characteristics of plastics, if the operation is not performed properly during injection molding, insufficient injection will cut off a thin layer of the body, resulting in uneven inner walls and unavoidable retention during the piston stamping process. Gap, resulting in inability to discharge.