Why does the lotion pump fail to rebound after pressing the head

The existing lotion bottle has a leakage-proof lotion pump surrounded by a main column peripheral wall. The lotion pump includes a press head, a lock cover, a screw sleeve, a body, a main column, a secondary column, a piston, a glass ball, a spring, and a straw.The lock cover includes The outer ring and the inner ring located inside the outer ring are sleeved outside the body to prevent the lotion bottle from flowing out of the lotion bottle from the gap between the body and the lock cover due to transportation vibration when the lotion bottle is in a closed state.

The problem with the existing lotion pump is that when the lotion pump is in the open state, the body, the piston and the lock cover form a space. Because the lotion will enter the space through the vent or other gaps during transportation, when the lotion bottle is opened, the lotion When the spring rebounds after the pump is squeezed, the emulsion in the space needs to be discharged through the vent. However, the existing lotion pump has a small number of vents and a small opening area. When the lotion covers the vents, the pressing force provided by the spring to the piston is not enough to offset the tension of the lotion and discharge the lotion in the space, and then drive the main body The column, sub-column, and head press move smoothly, causing slow rebound after pressing the head, and the lotion pump works abnormally.

Why does the lotion pump fail to rebound after pressing the head?

In order to avoid this kind of situation, in the production process, we should first check whether the length of the spring is standard. The difference is a thousand miles away. The effect of the length on the piston cannot be ignored. If it is short, the return stroke of the piston will not be in place. Directly cause the head to be pressed down, the rebound cannot be achieved or the rebound is slow.

Secondly, check whether the thickness of the piston fits the body. During the movement of the piston, any gaps will cause the suction force to be weak, and the body cannot be discharged by pressing the head. Due to the thermal expansion and contraction of plastics, a normal piston is very important to ensure the quality of the emulsion pump.

Finally, let’s analyze the body. In view of the plastic’s scalability characteristics, if the injection is not performed properly during injection molding, insufficient injection will cut off a thin layer of the body, resulting in uneven inner walls, and inevitably leaving behind during the piston stamping process. Gap, resulting in failure to discharge.