What Is a Dispenser?
A jet dispenser is a device that dispenses a fixed amount of solution from a container. It is also simply referred to as a dispenser.
They are often used in industrial applications, such as applying adhesives to gasket materials or soldering small amounts of solder to electronic circuit boards. However, dispensers for hand washing detergents and alcohol sanitizers are commonly used for household purposes.
Dispensers are also named according to their method. The most common type is the air pulse dispenser, in which the solution is dispensed from a syringe.
Uses of Dispensers
The following are some of the main applications where dispensers are used.
- Automobiles
Automotive parts are made up of many components, which are again made of many small parts. When assembling parts such as instrument panels and bearings, dispensers are used to join the parts together.
Some dispenser molds have a dispensing tip diameter of only a few millimeters so that even the smallest parts can be handled. - Electronic parts
As with automotive parts, many electronic parts are very fine, so dispensers with thin tips are used.
A typical example is soldering on electronic circuit boards. Conventionally, a method called screen printing has been used. Compared to the past, equipment has become smaller, and more precise parts are required. Since it is difficult for screen-printing to support miniaturization due to the shape requirements, soldering by dispensers is used.
Principle of Dispensers
The principle differs depending on the method, but here we introduce the air pulse method, which is a typical dispenser.
The air pulse system consists of an air source, piping, regulator, controller, and syringe.
First, compressed air is released from the air source. The compressed air travels through the piping to the regulator.
The regulator reduces the pressure of the compressed air and sends the air to the controller at a constant and stable pressure. The regulator is connected to the controller because sending compressed air directly to the controller side would result in damage to the components.
The controller regulates the pressure supply to the syringe. The condition of the supply is set by the operator.
When pressure is applied to the syringe, the solution in the syringe is dispensed.
Although the supply pressure is adjusted by the regulator or controller to be constant, in practice, there is a problem. As the solution in the syringe decreases, the dispensed volume also decreases. To reduce the dispensing volume variation, it is necessary to reset the conditions according to the remaining solution volume.