Volumetric dispensing

High precision volumetric dispensing

mta’s precision piston dispensing system is used for liquid and high-viscosity materials with mono or two-components and various dispensing processes, such as potting, gluing or conformal coating.

The piston-cylinder pump works volumetrically – the amount of material to be potted is defined mechanically by the geometry of the cylinders and the stroke of the pistons. The system is therefore independent of temperature, viscosity of the material and material feeding pressure. The metering pumps are based on low-wear ceramic piston-cylinder pumps and available in various sizes and can thus be adapted exactly to the respective dispensing task. The smallest version enables dispensing quantities from 0.1mm³ in the highest precision and repeatability.

The working principle of mta volumetric dispensers combines a linear motion to define the amount of material to be dispensed (see 2 and 4 in on the image below) and a rotary motion (see 3 on the image) to feed the material outwards.

When a two-component material is used, the mixing ratio of the resin and hardener component is established by an individual piston stroke of the two dispensing pumps.

The piston pumps convey the two components separately but in parallel into a dynamic mta  mixing chambers with a rotating mixing element. The reaction or pot life begins only in the mixing chamber and thus outside of the dispensing pumps. Depending on the selected material mixing time, mixing speed and mixing chamber volume are chosen, guaranteeing a homogeneous mixture.

Continuous volumetric dispensing

Continuous dispensing of liquid and highly-viscosity materials is possible with mta’s rotating and low-pulsation displacement system. For example, sealing or adhesive beads can be applied in any length and in a highly precise contour.

The basic principle is based on a helical rotor that moves with an eccentric motion in a stator, creating accurate and sealed cavities. These cavities are continuously conveyed by rotation to the dispensing needle or mixing chamber. The establishment of the amount of material to be dispensed is carried out via the stator and rotor geometry, as well as the set speed.

Through the use of ceramic components, this system is suitable for applications in various fields. For example, in the pharmaceutical and medical industries where often inert dispensing systems are required.

Similar to the piston dispensing system, an individual adjustment of the mixing ratio is possible in case of two-component materials. The mta dynamic mixing chamber ensures a constant mixing quality.