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Dispensing of minimum quantities


Dear sirs,

do you know how big a a coarse grain of sand is? Two cubic millimetres. This size corresponds also to the smallest shot-volume which our new minimum quantity piston dispensing system (M-KDS) delivers. Its performance in practice we show by gluing electronic compounds.

But see for yourself


Bernd Faller
Managing Director RAMPF Dosiertechnik

The task

Products always have to offer more and more functions spanning several industries in the highest precision and on the smallest installation space. The result is micro-components with complex geometry and short production times. Companies such as RAMPF Dosiertechnik, which provide reliable means of applying sealing foams, sealing compounds or adhesives, are required to offer new technologies for miniature products. And so it was that the specialists from RAMPF Dosiertechnik received the respective order about a year ago. Its partners:  Polytec PT, Waldbronn, and the manufacturer of assembly units Mondragon Assembly, Stockach.
The material, a two-component, electrically conducting adhesive, was to be applied in the smallest of quantities in the shortest possible time onto components under tension. In detail it concerned developing a system which dynamically mixes filled materials, dispenses extremely close to the mixing system, in order to avoid wastage and excessive pressures. In addition, the design of the system should make a multiple layout possible with the smallest possible clearance. The particular challenge thereby: to develop non-sensitive dispensing pumps for mineral or metallic fillers.

The solution

The heart of the matter is the piston dispensing system, which dispenses each component with the highest precision directly into the mixing chamber. The piston system is electro-hydraulically driven, a linear drive concept which makes piston systems with small construction volumes possible and hence an extremely compact arrangement of the components. Spool valves control the flow of material displacement-free from the supply container into the mixing chamber. Materials in cartridges starting from 30 cm³ or in pressure vessels can be processed. A further novelty: No bleeding is necessary after the cartridge is changed! This concept permits processing of the most diverse of materials with a broad spectrum of viscosities - both one and two-component systems.

The decisive advantage of the M-KDS is that the small quantities of material are intensively mixed by the dynamic procedure. The material is applied quickly and precisely. The shortest possible dispensing time is about 300 milliseconds. Thanks to the volumetric dispensing of the piston dispensing system, the user can rely on a consistent dispensing result which is independent of viscosity. Production breakdowns do not represent a problem, because the system can be rinsed automatically with the master component or a cleaner. Pot lives of a few minutes are not an obstacle and permit optimized processes.

The advantage: Flexible dispensing of minimum quantities

The minimum quantity piston dispensing system M-KDS is the successor of the first minimum quantity dispensing system M-DS from RAMPF. Thanks to the new technology, the M-KDS makes the casting of even smaller quantities possible. The specialists at RAMPF are also able to cater better to the properties of the material - instead of viscosities of just 50.000 mPas, viscosities up to 200.000 mPas can be processed. The modular and compact structure is equally suitable for integration into production lines. More advantages at a glance:

  • Optimal material preparation using a dynamic mixing system
  • Extensive process monitoring options
  • Dispensing output range 2 – 20 mm³/s (depending upon material)
  • The M-KDS is ideal for applying minimal amounts of highly filled materials, as often arises in the electronics industry.

Disclaimer

All product and application information given in this e-mail and on the RAMPF Group home page as well as on the other RAMPF Group companies’ websites is of general nature and is not intended to constitute any precise guidelines or instructions. Under no circumstances does this information replace any individual advice, technical data sheets, material safety data sheets or similar information. The user is liable to test the suitability of any product for its intended use. Due to the many different possibilities of application and application areas it is necessary to obtain individual advice and to verify the suitability for the planned use taking into account the user’s circumstances. We are pleased to offer our support to our customers for this purpose.

RAMPF Dosiertechnik GmbH & Co. KG - Headquarters Zimmern o.R. - Local court Stuttgart - HRA 471287 - General partner RAMPF Dosiertechnik Verwaltungs GmbH - Headquarters Zimmern o.R. - Local court Stuttgart - HRB 471082 - Chief executive officers: Rudolf G. Rampf, Bernd Faller