Selections dispensing systems

MUSASHI has a wide range of metering valves and metering systems. MUSASHI thus offers solutions for a wide range of applications. The selection of the suitable dosing system is based on a variety of criteria

• The material to be dispensed
• The geometry or quantity to be dispensed
• The desired degree of automation

The properties of the materials are summarised in the MaterialDataSheet (MDS) (not to be confused with the SDS Safety DataSheet, which describes the handling of a specific material/hazardous substance). handling of a specific material/hazardous substance).

The relevant criteria are

• Viscosity
• Size of filler particles (if present) or the curing mechanism (especially for adhesives).

Thin-bodied (low viscosity) materials can be jetted. For viscous (high viscosity) pastes, mechanical dispensers such as screw or auger dispensing valves are more suitable. screw or auger dosing valves. Pressure-time dispensing systems, on the other hand, have the greatest flexibility and can dispense materials with a viscosity from 1 to 1,000,000 mPa*s.

Some materials contain fillers, e.g. solder paste with solder balls or heat conductive pastes with ceramic particles. These also influence the dispensing system.

When dispensing adhesives, the curing mechanism is another important criterion. For the common 1K adhesives these are:

• Curing with light
• Stimulation with light
• Temperature increase
• Exclusion of oxygen and contact with metal (anearob)
• Admission of humidity

For example, for anaerobic adhesives, dispensing systems must be selected in which the material-carrying parts are not made of metal: For example, pressure-time dispensers with cartridges and plastic needles, jet valves where the material-carrying parts are made of peak or ceramic or peristaltic pumps.

2C adhesives consist of separate components that react to form polymers after mixing. Usually one component contains resin monomers (or binders), while the other contains hardeners. 2C adhesives are processed as PreMix or with special dispensing and mixing systems.

In addition to the material to be dispensed, the dispensing geometry is also relevant. This concerns the shape.

The same applies to the absolute dispensing quantity. The respective quantity to be dispensed can be derived from the geometry of the parts or weighed out on the basis of tests. The relationship between volume and weight also results from the density. For example, water has a density of 1mg/mm³ or 1g/cm³ or 1g/ml.

Another clue can be the container size to be used:

• Standard cartridges are usually available from 5-100 ml
• Large cartridges are available from 100-400 ml
• In addition, dispensing from the tank (from 1 l) or bucket/hobbock (from 20 l).

Another criterion for selecting the optimal dosing system is the degree of automation. On the one hand, this concerns the expected production quantities.

It also concerns the positioning accuracy and dispensing quantity required for the dispensing process, which are determined via the handling, the dispensing system and the dispensing needle.