Materials or suckers are a device that automatically transmits raw materials (plastic granules) from the main tank to the injection hopper to be uninterrupted production process.

The materials are usually divided into single -phase and three -phase categories. Also, according to the capacity and needs of the production line, different models with different volume and power are offered.

In principle, the substances and suction have the same purpose and purpose, and there is no difference between the two words in the plastic injection industry; But in some sources, the suction may point to a device that has a stronger suction and is suitable for higher density materials.