World of Dosing

Paste dispensing or dosing in photovoltaic PV – is it worth to use an automatic dosing equipment ?

Georg Senftl — Fri, 17 Apr 2009 07:37:13 +0000

During photovoltaic cell production, screen printers apply different types of paste, either silver Ag or aluminum Al or aluminum-silver AlAg. These pastes need to be dosed or dispensed in a proper way into the screen printing machines. Many times this is done by hand. Beside this there are good dosing systems for the paste, such as from ViscoTec. But is it worth using a full-automatic dosing equipment? Using dispensing equipment for the paste saves labor cost. But this is not the big deal.

Consider a 4 Euro cell, where only 20% of the cost is the paste. Lets suggest with the dosing equipment you save 0,5% of paste and reduce the failure rate by 0,2% (the paste is much more homogeneous with a ViscoTec dispenser type ViscoTreat).

A line with 1200 cell per hour, running 700 hour per month, has an output of 840.000 cells per month. So the monthly savings of paste is about 3.360 Euro. Further, you can sell for 6.720 Euro more cells because of the better quality. Your total savings can be 10.000 Euro/ month. I am wondering if you agree with my figures? I would be happy to get your feedback at georg.senftl*Viscotec.de (please use the @ instead of the *) Georg Senftl

Austrotec in Graz June 13th - 15th, 2007

Manuela Kühnel — Tue, 05 Jun 2007 06:28:02 +0000

The Austrotec takes place this year for the second time in Graz in messecentergraz and offers a platform to the information exchange over current standards and trend in production and automation technology and quality assurance. On the innovation fair for the manufacturing process we will present our technology.

We will provide dispensing and application solutions for low to high viscosity products. We inform you in detail about our innovative solutions, e.g.:

- Robot-supported applications of low to high viscosity adhesives and sealing materials
- Hobbock and barrel emptying systems
- Dosing of adhesives and sealing compounds
- Product preparations
- 2-component-dosing
- Color dosing
- Dosing of abrasive pastes

Perhaps you drop over. You can find us in Stadthalle, booth 116.
You find more information about Austrotec under http://www.messecentergraz.at/austrotec07/

Dosing of soldering paste

Georg Senftl — Fri, 16 Mar 2007 09:45:35 +0000

Yesterday I participated in a service employment. The customer doses soldering paste as a application on a metal part, dosing quantity approx. 1.5 g, and had a ViscoTec plant in use, which ran for 7 years nearly problem-free. The entire plant consists of the components dosing control with dispenser and product supply, whereby the product supply is implemented as agitating mixing system with evacuation. The soldering paste is enriched with many air and/or gas vesicles, which is sucked off by the vacuum produced by a vacuum pump. Several weeks ago one had cleaned the hoses and the storage vessel, and since then our Dispenser had twice failed. In addition for some time the dosing result was not satisfactorily. The failure cause of the Dispensers was fast found: during the cleaning apparent larger chunks of the somewhere hardened soldering paste came into the system, and blocked a nozzle. The ViscoTec Dispenser then must develop a very high pressure, this leads medium-term to the destruction of the construction unit stator. During this maintenance the operator tells by the way that the vaccum pump does not function ‚probably’ any longer. He hasn`t thought over it however no further, and from his boss he was not asked over remarkablenesses. Would have been so simple: if air is in the paste, then the dosing accuracy cannot be correct, this always leads to a bad accuracy, and/or above all also to a dripping at the nozzle or for the interruption of the application. The cause was a defective safety switch and fast found. A small cause - large effect: often this saying applies to problems when dosing. A sealing for 20 cent, which is not leak-proof, often causes costs of several 1000 Euro. And we are afraid nothing as much, as air in the system or in the product. Its George Senftl

Bonding in the automotive engineering

Manuela Kühnel — Thu, 08 Mar 2007 10:01:03 +0000

The adhesive technology forms frequently the substantial basis for the advancement of mixed-architecture constructions in the lightweight construction. Against this background the Bayern Innovativ GmbH organizes in co-operation with the Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung (IFAM), Bremen, the 7. BAIKA cooperation platform „Bonding in the automotive engineering“ in Nuremberg.

Innovative product developments and practically solutions to the topics

- bonding in carcass and assembling
- innovations by bonding in commercial motor vehicle construction
- interior solutions with the bonding technology
- innovative 2-component-dosing technology
- inspection of adhesive and sealant application

are discussed in this industry study group.

ViscoTec reported last year on the forum with the topic „Process-sure dosing of very viscous adhesive and sealing materials“. Pictures

Program and registration see http://www.bayern-innovativ.de/kleben2007

Place and date of event:
April 24th 2007
Nürnberger Akademie, Marmorsaal (2.OG)
Gewerbemuseumsplatz 2
90403 Nürnberg

Data base dosing

Georg Senftl — Thu, 01 Mar 2007 09:56:01 +0000

Probably in each company, above all if it concerns dosing of different adhesives, sealing materials or colors, the question often arises: did we make that already times? And above all: how did we make that? And were there problems? I do not know, as much 1000 different adhesives or sealing materials there are, beginning with anaerobic adhesive, over RTV silicones to UV adhesives. I know however that many of them require an individual dosing technology. Now we have dosed some hundred different products with surely already, made many errors, but gained evenly also very much experience, where one must watch out. So that this knowledge is not only present in our coworkers´mind, we began now the structure of a data base. Here now the most diverse plant parameters to all different products are deposited, if possible with exact product number and MDS, and all test results or customer experiences in this connection are stored. Thus if you should look for someone, which has already experience with a special product, just ask us. The probability that we know your application, is high. It doesn`t cost anything to ask, and one does not have to reinvent the wheel again.

Basis training in the adhesive technology (EAS)

Manuela Kühnel — Mon, 26 Feb 2007 08:45:28 +0000

As already mentioned in the last article, we offer gladly presentations for workshops, training courses, events etc. Our next presentation will be with ofi in Vienna. ofi is one of the largest test and research institutes for chemistry and technology in Austria. Among numerous seminars ofi also train as European Adhesive Engineer (EAE), European Adhesive Bonder (EAB) as well as as European Adhesive specialist (EAS). For us the latter, the EAS training, which conveys the quality relevant knowledge demanded for the adhesion method arranges as a surpervisor to the participants, is current. ViscoTec contributes one day during the 3-week-training course with a , in order to illustrate the topic practically to the participants. This training course is running since Febr 19th and still lasts up to March 23rd.
Flyer European Adhesive Specialist (EAS)

In autumn we will also contribute actively the training course European Adhesive Engineer (EAE). This training course is more extensive and consists of 8 modules (8 weeks).
Flyer European Adhesive Engineer (EAE)

ofi Österreichisches Forschungsinstitut für Chemie und Technik
A-1030 Wien, Franz-Grill-STraße 5, Arsenal, Objekt 213
http://www.ofi.co.at/

Training courses and presentations

Andreas Grünfelder — Fri, 23 Feb 2007 07:26:55 +0000

Ever more frequently institutions of education such as universities or institutes or companies would like to make a request for presentations by us. Gladly we follow these inquiries naturally. It does not play a role for our advisers from the management and the field service whether a company presentation with conception of our products or a general overview of the dosing technology is desired. We would be pleased to become active here. Just write us if it is in your interest.

Workshop adhesive technology manufacturing

Manuela Kühnel — Fri, 26 Jan 2007 14:04:14 +0000

Among proven joining processes such as riveting, welding, or a soldering the adhesive technology was established as independent science, with which scientists, engineers and designers argue increasingly. Since we are strongly represented in the range adhesive technology, we would like to use the opportunity to participate in this Workshop energetically. With our presentation „ViscoTec Dispenser technology - possibilities for the automated adhesive application“ we will light up the points of topic structure, assembly cells, dosing accuracy and reproductibility as well as machine ability in detail. Perhaps you have time and interest to visit this Workshop. You expect numerous interesting lectures approximately around the topic adhesive technology manufacturing.

Place of event:
2007 March 20.-21.
Fraunhofer Institut für Fertigungstechnik und Angewandte Materialforschung IFAM
Wiener Straße 12
28359 Bremen
http://www.ifam.fraunhofer.de/ (see „Veranstaltungen“)
Flyer Klebtechnische Fertigung

Bonding liability

Georg Senftl — Tue, 02 Jan 2007 13:31:35 +0000

With a recent visit to the adhesive manufacturer Delo, we talked also about the topic liability, and this literally ambiguous.
Meant is here who is responsible in the legal sense for a bond?
From the view of the adhesive manufacturer (and that is very important for the user to know) only for certain characteristics of the adhesive, like e.g. tensile strength, elongation of break, shearing strength or e-module a guarantee is generally taken over. But not for e.g. that with this adhesive two construction units lasts 100 years together with a load X. From the view of the dosing plant manufacturer only one guarantee can be taken over for quantity, accuracies or that the adhesive is not stressed or air is entered. It becomes critical particularly with applications of 2-components, since here not only the mixing ratio, but also the mixing quality are extremely important. A respectable supplier will and cannot take responsibility, since too many factors of risks meet here, which are not provable in the case of doubt, and generally also not at all the technical possibilities of an examination are present. The legal liability remains thereby with the user. How now is the proceeding for a new bonding process? Ideal way here is looked for a close partnership between adhesive manufacturers, dosing plant manufacturers and users. Here a close exchange of information must take place from the beginning of the development, which brings in all partners with. It makes a little sense, here (unfortunately often observed) for reasons of the secrecy important data restrainable. Only out from common made experiments data can be determined, which offer high security to the user.

26. Motek in Sinsheim

Andreas Grünfelder — Fri, 13 Oct 2006 12:04:13 +0000

That was it then, the 26. Motek and only little wistfully we look back after Sinsheim. Not because of that qualitatively and quantitatively high-quality contacts, but because of the not completely optimal traffic route. For us the past six fairs, since we exhibited 2001 for the first time on the Motek, brought many different impressions. So my colleagues might prove their sauna restistance with the first participation 2001 still in the provisional tent. I had more luck with my first participation 2002 then, because the most modern hall stood already there, the hall 6. Unfortunately this hall was located somewhat remotely, so that we could often extend our short fair-nights in the morning. In our opinion it was the result of the unfortunate positioning of our booth which was located on an outer aisle and the likewise not completely successful visitor guidance. Anything the despite our experiences did not fail predominantly positively, even if only heavily in contacts, from this resulting conversion or rising numbers of employees can be expressed. If one makes the summary and regards itself thereby our customer master, it is noticeable that the Motek has here large influence. In memory probably remains also the Sickinger Hof in Walldorf in which we accomodated since 2002. Nice staff, good food and room in whom you can bear one week comfortably. Besides is also the Walldorfer city center inviting to walk, comfortably eat and also times to drink beer. With our exhibits we also left some experiments behind us. At first the opinion dominated, if we want to present our dosing technology optimally, we must show a robot, which demonstrates the speed-proportional applications. Since in the first two years however many wanted to buy robots in place of the dosing technology, we have decided to demonstrate this with „a record player“ as it was called by us. Different speeds could be changed by the visitor and their effect on the made appliaction be examined. Purpose was to demonstrate that with coupling with the travel speed the bead forming intensity remains always alike in the diameter. If one switches the coupling off, also the bead forming intensity changes with the travel speed, which can be also changed by the dispenser speed. This year had we in a brainstorming, as I mean, the ingenious idea, the visitor can move a crank to demonstrate that the bead forming intensity remains, no matter how fast it would be cranked.
Next year the Motek moves then into the new fair in Stuttgart. At the same time it will take place for the first time as attached adjoining exhibition the Bondexpo (fair particularly for sticking and sealing materials as well as associated dosing techniques). That we will naturally go through the jump to Stuttgart is beyond all questions. Whether we will however exhibit at the Motek or the Bondexpo from the beginning as new presentation platform is not decided yet. Where would you visit us gladly? On the Motek or the Bondexpo?
How did the Motek from your view as a visitor develop in the last years? Give us a short feedback.

Love of greetings from Töging A. Inn