Micro Dispensing Techniques
Micro dispensing is the technique of producing liquid media dosages in volumes of less than one micro litre. The continuing miniaturisation in almost all technical areas creates constant challenges for industry, development and research facilities. Micro dispensing is one of those challenges. Ever smaller amounts of adhesives, liquids, oils, greases and a multitude of other media must be dispensed reliably and accurately in dosage and placement within shortest cycle times.
Dispensing techniques
Basically there are two different dispensing techniques:
The classic contact dispensing and the later non-contact dispensing.
Contact dispensing
Contact dispensing is as old as the desire, to apply small amounts of a medium, stored in a container, at certain positions. A good example for this is, applying adhesive with a tube. To transfer the adhesive it requires contact between the tip of the tube and the part onto which the adhesive has to be deposited.
Typical charactaristics of this method:
- Slow dispensing
- Part has to be touched
- Part could be damaged during contact
- Adhesive forms threads on speration from part
- Adhesive is not in the expected place
- Adhesive amounts are difficult to reproduce (big variation)
Despite of these disadvantages, contact dispensing is still used in the majority of automated processes today.
The reasons for this are:
- Lack of knowledge regarding non-contact dispensing technology/systems
- Few manufacturers for non-contact dispensing systems
- No direct access to dispensing area of part (e.g. undercuts)
- Medium not suitable for non-contact dispensing
Non contact dispensing (Jetting)
Because of increasing demands with regard to cycle time and accuracy in almost all areas of production, non-contact dispensing is constantly gaining importance. A good example for this application is the attachment of very small electronic components (SMD parts) onto printed circuit boards and substrates. In such cases the component carrier needs to be positioned in one plane only, so that the adhesive can be transferred without contact.
This examples demonstrates the advantages of non-contact dispensing:
- Elimenating of a feed motion to the part (saving of prozess time)
- ejection of adhesive (saving of prozess time)
- No contact with the work piece (no damage)
- Even spread of adhesive independent of part topography and surface structure
Media
With the appropreate experience and know-how in dispensing, a large number of media can be dispensed with the non contact method.
To assure the suitability of your medium for non-contact dispensing, we offer you comprehensive consultation and initial dispensing test, free of charge.
You can profit from the use of this dosing technique, which provides you the following advantages:
° No damage to the work piece, since no contact
° Precise application of smallest amounts as needed ( 10 to 40 nanoliter )
° Time savings, since no translatory movement between work piece and valve is necessary ( dosing with up to 150 shots/second possible )
° Uniform forming of adhesive droplets independent of work piece topography
and surface structure
° Dosing process independent of the shape and positioning tolerances of the work piece
° No soiling of adjacent components respectively of surrounding area
For solving and optimizing your dosing processes, LIQUIDYN GmbH is your competent partner.
Tags
Adhesive materials, gluing materials, dosing of adhesives, deposition of adhesives, gluing, glue, attaching, fastening, fixing, embedding, sealing, applying
