Why do some of the lotion pumps not have springs?

When you use the lotion pumps, serum pumps or mist sprayers, have you even noticed that some of them do not show the spring?

You must have known that the spring is a must for a pump to press the product out from the bottle. In this article,you will know the secret.

Normally, there are 2 positions of the spring for a pump.The most common position is right between the plastic tube and the collar. Fixed inside the chamber which is called built-in spring pump. Some of the caliber is using clear plastic so that the spring is shown while some are opaque plastic which can hide the spring.

The other position is inside the pump head, you will see it when you remove the head,it is known as external spring pump.

Maybe you would ask which pump is better?

Actually, every coin has two sides.

The external spring pump was developed in 2006,patented by Ding Yaowu with patent number 2006100278506. In order to overcome the problem of the built-in spring pump:

1. The return spring is usually placed between the piston head and the cylinder, so that the spring is in contact with the lotion, thereby bringing the problem is that the spring is corroded by the emulsion and the corroded spring in turn contaminates the emulsion. While with the developing of the technology,the spring which is used for the pump is improving, so they are more and more stable and hardly have affection to the lotion.

2. There is another difference, the built-in spring pump usually requests less pressure to be operated than the external spring pump.Because the different structures, the former is not as durable as the later.

3. The built-in spring pump is normally used for the essential oil,perfume and toner etc. These products have lower concentration. And the external spring pump is widely used for lotion, shampoo, conditioner which have higher concentration.

4. The external spring pump developed in 2005 has been improved in the instruction, The old external spring lotion pumps have the defects of complex structure and large number of parts. Most of the external springs are set at the "neck" position under the pressing head, so that the neck of the lotion pump and the bottle body where it is located becomes very thick, which changes the size ratio in traditional aesthetics and affects the appearance of the entire product. In addition, some external springs set at the "neck" position also require a higher bottle mouth to match them, which affects the versatility of the product. The purpose of "Spring External Lotion Pump" is to provide a spring external lotion pump with simple structure, few parts and no influence on appearance.