India Powder Coating  
      IPC-E Newsletter: August  2004  
  Welcome to the August 2004 edition of the IPC e-newsletter.

This edition of the newsletter contains:

News features.
The Powder Coating Manual (Part 31)
Exhibitions and Conferences in August and September 2004


If you have information you would like to have included in this newsletter, please contact the moderator using the details given at the end of each newsletter.

Please note our new email id: viveksoley@ipconweb.com

 
 
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    News Features      
   

India Powder Coating is one of  the publication partner site for "POWDER COATING 2004"

In today's competitive marketplace, you have to have proven answers!  POWDER COATING 2004, the worlds largest powder coating conference and exhibition will provide the answers you are looking for!  With powder coating, you can reduce rejects, save money, coat many substrates, improve productivity, eliminate solvents and waste disposal, get quick color change, provide aIndia Powder Coating high-quality, long-lasting finish - and that's just the start of what powder coating can do for you!

Sponsored by The Powder Coating Institute, POWDER COATING 2004 will take place at the Charlotte Convention Center, Charlotte, NC, USA from September 21 - 23, 2004.

India Powder Coating will be one of the publication partner site for conference. We will continue to provide further details on the conference in the coming issues of our newsletter.

 

Infomercial from Oxyplast Pakistan Pvt. Ltd.

In 1993, Oxyplast Pakistan (Pvt.) Ltd. arose with the technical collaboration M/S. OXYPLAST BELGIUM N.V/S.A. & from then onwards, Oxyplast Pakistan has maintained its leadership position till today in the field of Powder Coating of Pakistan’s market because of its four priorities i.e. quality, technical development, customers service & environmental care. The current installed production capacity of Oxyplast Pakistan is in the range of 2500 to 3000 M.T. per annum. The company has the distinction of being the 1st ISO 9002 Certified Powder Coating manufacturer in Pakistan. “Bureau Veritas Quality International (BVQI)” currently certifies Oxyplast Pakistan (Pvt.) Ltd. as an ISO 9001:2000 certified company.

Since early sixties, Oxyplast had been the brand name of “ LIBERT PAINTS ” but from the last decade of nineteenth century, Oxyplast expanded at many parts of this globe with the head name of “OXYPLAST BELGIUM N.V/S.” having its Head office in Gent, Belgium.

Oxyplast has established a network of 28 Licensees spread over the world that includes Brazil, Chile, Columbia, Greece, India, Indonesia, Italy, Korea, Malaysia, Morocco, Pakistan, Poland, Philippines, Saudi Arabia, Singapore, Slovak Republic, Taiwan, Thailand, Turkey, United States of America etc.


Mr. Jamshed Ahmed Chandiwala (Managing Director Oxyplast Pakistan) finds India Powder Coating very informative. In his comments he said,
"It was a good experience visiting www.ipconweb.com  and renditioning the e-news letter. It does provide me the latest information. I hope Mr. Vivek soley will maintain this good service for long time"

I
For further details contact
Chandiwala Group.
Oxyplast Pakistan (Pvt.) Ltd.
Mr. A.I.Siqddiqui
Silver House, 11-E, Block–6, P.E.C.H.S., Karachi, Pakistan.
Tel 0092-21-(4312901-5) 5lines
Fax 0092-21-4312906.
Email Address oppl@super.net.pk
Web Site http://www.oxyplast.com.pk
 


 


  Infomercial from MITSUBA SYSTEMS (INDIA) PVT LTD, 
 
  Mitsuba introduces New Automatic Powder Spray System with new advanced features to provide the user the highest level of finish.  
     
  AUTOMATIC POWDER SYSTEM  
     
 

     FEATURES
Modular Concept, Easy to customize.
Complete plug in-plug out design.
Both Corona & Tribo guns can be operated from the same control.
Interlocking available between the modules and external systems.
Meets IP54 standards.




     COMPONENTS
Master Control panel (MCP).
Individual Gun Control Panels (GCP).
Air Distribution Panel (ADP).
Interlocking Control Panel (ICP).
Reciprocator Control Panel (RCP)
Integrated 100KV infiniti ™Automatic Corona Guns
Centralized powder Hopper with powder pumps.
   
 
     
  Infiniti™ Auto Corona Gun (U.S. Patent No. 5678770)  
     
 
Automatic Infiniti™ powder spray guns have a 100KV generator in the gun itself. It also has the trend setting re-settable cascade system. The gun can also include an air rinse system to clean electrodes & deflector/flat spray nozzles to optimize transfer efficiency.
 
     
     
 
For more information please contact :

MITSUBA SYSTEMS (INDIA) PVT LTD,
34/H, LAXMI INDUSTRIAL ESTATE, NEW LINK ROAD, ANDHERI (W),MUMBAI – 400 053.
TEL:    91-22-2631 8633/2633 4735/56924151-52-53      FAX:   91-22-56924154.
Email :    mitsuba@vsnl.com 
Website :    www.powdergun.com

 
     


 


 

Infomercial from Orgamine Chemicals (I) Pvt. Ltd.

Orgamine Chemicals (India) Pvt Ltd. manufacturers of bulk drugs (Active Pharmaceutical Ingredients) with a clear focus on generic drugs in the anti-epileptic segment. Since inception in 1977, the company has moved from strength to strength, first establishing a reliable manufacturing design and then on business development.
We are India's Leading Manufacturers and Exporters of Phenytoin Sodium (I.P./B.P./U.S.P) , Phenytoin Base, Benzoin and Benzil.

Benzoin is used as an additive in Powder Coating. Our product is used by number of leading powder manufacturers in Western India region.

For details contact
Orgamine Chemicals (India) Pvt Ltd
W-8, Phase II,
MIDC Dombivali
District Thane - 421 204
Tel: +91-251-2871746/2870858
emai
l info@orgamine.com
website www.orgamine.com
 


Protech Chemicals Ltd Asian Paints Industrial Coatings Limited tie up
A press release on Protech Chemicals Ltd. website says

"Protech Chemicals Ltd. of Montreal, Canada is pleased to announce that it has entered into a licensing agreement with Asian Paints Industrial Coatings Limited, a wholly owned subsidiary of Asian Paints of Mumbai, India. Under terms of the agreement, Asian Paints will be granted access to Protech's wide range of products and formulations, as well as, Protech's manufacturing and marketing capabilities.

This collaboration brings a wealth of experience and technology to Asian Paints.This will enable them to significantly upgrade the products offered to their powder coatings customers. The agreement also further strengthens Protech's position as a dominant player in the formulation, production, marketing and distribution of powder coatings. Protech is renowned for quality and innovation and is recognized as the leader in powder coating solutions.

Asian Paints is the largest coatings producer in India and is considered to be one of India's four "most respected companies".

In an email interview, Mr Mark Lazarus of Protech Chemicals informed India Powder Coating, "
We believe that there is a great deal of synergy between Protech and Asian Paints and that this will launch the Indian company into the forefront of the coatings industry in that region. The melding of our two companies' technology and marketing expertise will allow Asian Paints to become the dominant player in the Indian market."

One of our subscriber had this to say on the tieup, "
Definitely this is good development, but we know Asian was having technical collaboration when they entered in the powder coating business. They had not done well. Technology is one thing, second is capability."


It may be noted that  in December 2001 Asian Paints, had acquired the powder coating business of the Mumbai based Hawcoplast Chemicals for Rs16 Crore. Hawcoplast had a technology tie-up with Oxyplast, Belgium, a leading global Powder Coatings manufacturers. The acquisition had catapulted Asian Paints to amongst the top  powder coating manufacturers in India

2004 Asia Pacific Coatings Show in Thailand
The 2004 edition of the Asia Pacific Coatings Show proved to be a successful and well-attended event. Held at the Queen Sirikit National Convention Centre on June 3-4, the exhibition experienced a continued influx of paint personnel throughout the two days, attracting around 4,700 attendees from 41 different countries. John Everett, of e-epoxy.com, said this about the show

"The show was busier than we've seen in the past, and was well attended. Many companies used the expo to launch new products - so that was exciting to be among the first to hear about new developments. I would describe the mood as optimistic, likely a reflection of the growth we're seeing right now in this part of the world. We observed many more companies from China with their own stands at the show instead of having foreign agents participate on their behalf. I think that, in part, reflected the broad mix and range of visitors and exhibitors at this year's show. Overall, we were pleased to be part of this year's show and thank all those who stopped at our stand."


Climate Coatings gets $1m to perfect powder coating for wood
Auckland firm Climate Coatings has received a $1 million boost from Technology New Zealand to perfect a powder coating process for wood products.
Climate Coatings said it would match the Government funding agency's research and development (R&D) investment.
"The high performance powder coating process would transform both engineered and low quality woods, and natural timbers, into a high performing and economical ready-painted finished product," the company said in a statement.
Chief executive Guy Wills said the variability and heat sensitivity of different woods made the powder coating process a challenging one to perfect.
"The challenge now for our R&D team is to bring a variety of new and old technologies together to allow the powder coating of a variety of wood products," Mr Wills said.
The Technology New Zealand investment was part of programme that aimed to move companies towards high added-value and high margin products.
"In Climate's case, the outcome will be quality powder coating technology that has not yet been achieved elsewhere in the world and stands to add significant value to New Zealand's burgeoning supply of timber," Mr Wills said.
"Climate plans to take the technology global through partnerships and licensing." <more>


 
Amithab Bachchan Asian Paints
? Oh No.... Sirf Nerolac, Yeh hum keh rahe hai.
Readers may recall an earlier news item in the may 2004 issue of IPC e newsletter. Do celebrity ads really work? Here's some bad news for advertisers who're betting big bucks on celebrities. An Amitabh Bachchan or a Sachin Tendulkar are no assurance of a top-of-mind brand recall. Instead, there is a possibility that consumers may associate them with a competing brand .

A recent news item an Indian Express webpage  mentions Amithab Bachchan doing ads for asian paints(?).

 It reads, "From Parker Pen and Asian Paints to Hajmola and Chyawanprash, from Cadbury’s to Maruti Versa, Uttar Pradesh and Polio vaccine - he’s sold it all to you in your homes. In fact, given the pace of his brand endorsements he may well be on his way to set a record."

"Big Five' coatings companies retain positions in global ranking
Akzo Nobel remained atop the global coatings industry in 2003 in terms of sales with estimated coatings revenue of USD 6.074 billion, according to Paint & Coatings Industry magazine's annual ranking of the biggest coatings manufacturers. Akzo Nobel's 2003 coatings sales rose about 5% from the 2002 estimated total of USD 5.789 billion, and remained well above the sales of the number-two producer, PPG Industries Inc. PPG's estimated 2003 coatings sales were USD 4.482 billion, followed by The Sherwin-Williams Co.'s USD 4.096 billion, ICI Paints' USD 3.511 billion, and DuPont Co.'s USD 3.150 billion. The ranking of the top five coatings companies was unchanged from 2002. Rounding out the top 10 global coatings companies are BASF, at number six; SigmaKalon, number seven; The Valspar Corp., number eight; Nippon Paint Co. Ltd., number nine; and Kansai Paint Co. Ltd. in the 10th spot. SigmaKalon moved up from its number-eight ranking in 2002 and Kansai edged past RPM to take the 10th position.

Berger plans to invest Rs 30 cr to raise capacity
The Telegraph, Calcutta, India

Calcutta, July 29: Berger Paints plans to increase the capacity of its existing plants by investing Rs 30 crore in the current financial year.

“In our Jammu factory, we are investing Rs 20 crore to install a solvent-based production plant and a powder coating unit. We will invest Rs 3 crore in our Rishra factory to spruce up the production of decorative paints,” managing director Subir Bose said. The company will spend Rs 7 crore in upgrading the remaining factories.

The plants installed in the Jammu factory will raise the production capacity to 30,000 metric tonnes per annum, while the Rishra factory will produce 1,000 kilolitres decorative paints per month.

He said the capacity at its Goa plant would also be ramped up to 1200 kilolitres per month from 200 kilolitres per month. < more>

Akzo Nobel's operational performance up in Q2 2004
Arnhem, the Netherlands, July 19, 2004 - Akzo Nobel, the international pharmaceuticals, coatings and chemicals company, reports second quarter net income1 of EUR 216 million, up 7% compared with the second quarter of 2003. Net income including nonrecurring charges was down to EUR 112 million.


In presenting the report, Akzo Nobel's new CFO Rob Frohn said: "As expected, Akzo Nobel's Pharma business is having a rough ride. Coatings and Chemicals are clearly up due to strong growth and cost savings. The Akzo Nobel outlook for the rest of this year remains unchanged with a net income1 below 2003."


Akzo Nobel acquires coil coatings business Rhenacoat
Akzo Nobel has signed a contract with the ALTANA Group to acquire its Rhenacoat coil coatings business in France. The company, which employs 60 people, had an annual sales turnover of EUR 11.6 million in 2003. "This is a strategically important acquisition because it will provide Akzo Nobel with a dedicated coil coatings manufacturing facility in France, Europe's largest coil market," said Rudy van der Meer, Member of Akzo Nobel's Board of Management responsible for Coatings. "It will also give us access to the French building products market and present an excellent opportunity to grow and strengthen our coil coatings operation in some key business sectors."
Akzo Nobel is to take over the entire workforce, know-how and all the coil coating production facilities in Montataire. This leaves Rhenacoat free to concentrate exclusively on packaging coatings in Sedan, the one remaining site in France. "The sale of the Rhenacoat coil coating business in France is another logical step in the strategic realignment of Altana Coatings & Sealants, which is aimed at withdrawing from the industrial coatings sector to concentrate on building up high-potential niches - such as chemical solutions for flexible packagings - in the specialty chemicals market", explains Dr. Guido Forstbach, Business Unit Manager and Managing Director of Altana Coatings & Sealants GmbH..


Adhesives: Big differences in Asia's markets
Coatings Flash - July 26, 2004

Asia's markets for adhesives have developed very differently in the past. China, biggest market in the region, with a production quantity of 2.89 million tons, managed to achieve a growth rate of 10.7% in 2002. High quality products in particular contributed to a rise in value of 12.4% in the same year. In line with the general trend in the country Japan's adhesives industry continued to decline in 2002. 1.04 million t. were produced. Waterborne products are on the rise due to stricter requirements concerning VOC emissions. Meanwhile their share of the market in Japan has risen to 28%.
Korea counts as one of the important Asian producers. Volume there amounts to some 490,000 t. About 47% of the products are solvent based or formaldehyde based. Waterborne adhesives and hot melt adhesives together make up 40%. In Korea, too, the subject of VOC emissions is playing an increasingly important role. The fourth large producing country, Taiwan, achieved a total output of 326,200 t in 2002, a plus of 1.5% compared with the previous year.


Dow named best resin supplier for powder coatings in Brazil
e-epoxy.news July 2004

Dow’s Epoxy Products & Intermediates (EP&I) team in Brazil has scored yet another success! In a recent article, Paint & Pintura Magazine showcased the companies it had voted as the best supplier for each category of raw material. This year, Dow’s EP&I team in Brazil was awarded 1st place in the "Solid Resins for Powder Coatings" category.

Paint & Pintura Magazine is the main media vehicle in the Brazilian coatings industry, publishing a monthly magazine focusing on all of the production and commercial chain. They also promote a yearly election for the main raw materials suppliers, elected through the direct votes from the main coating producers. "This means a lot to us," said Joao Jensen, Epoxy & Performance Chemicals Sales for Dow, "because it reflects that our customers recognize our offering (technical services
and commercial practices) and shows that Dow is committed to the powder market and is aligned with our customer priorities from their point of view."e-epoxy.com offers three resins suited for powder coating applications: D.E.R. 662UH, D.E.R. 663U, and D.E.R. 664U.

 

 
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Up Coming Events


The Powder Coating Institute is host of the world's largest powder coating conference and exhibition to be held in Charlotte, North Carolina, September 21 - 23, 2004.

 


 

Your comments suggestions contributions to our website and the newsletter are always welcome. Your emails, letters, calls and visits are always encouraging.

Moderator


 
           
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    Exhibitions, Seminars, Course, Lectures  
   
2th Annual Short Course Advances in Emulsion Polymerization and Latex Technology
August 9 - 13, 2004
Short Course; Davos/Switzerland
More Information from:Dr. F. Joseph Schork, School of Chemical Engineering, Georgia Institute of Technology , Atlanta, GA 30332-0100, USA, Fax: +1 815 301-9729, http://www.che.gatech.edu/Davos ,
joseph.schork@che.gatech.edu


Report 2004 - For the excellence in paints and inks
September 2 - 3, 2004
Congress, Exhibition; Buenos Aires/Argentina
More Information from: SATER, http://www,sater.org ,sater@sater.org.ar


7th European Adhesion Conference
September 5 - 9, 2004
Conference; Freiburg im Breisgau/Germany
More Information from: Dechema e. V. Theodor-Heuss-Allee 25, 60486 Frankfurt am Main,Germany, Fax: +49 69 7564-441, http://www.euradh.org, euradh2004@dechema.de


Colour Measurement & Colour Control
September 13 - 14, 2004
Training Course; Teddington/Great Britain
More Information from: Paint Research Association ,8 Waldegrave Road, Middlesex, TW11 8LD Teddington , Great Britain , Fax: +44 20 8943 4705
http://www.pra.org.uk/training, e.brown@pra.org.uk

North African Coatings Congress
September 14 - 15, 2004
Congress; Casablanca/Morocco
More Information from: dmg world media (uk) ltd., Queensway House, 2, Queensway, Redhill, RH1 1QS Su , Great Britain, Fax: +44 (1737) 85 50 34
http://www.coatingsgroup.com, karentyler@uk.dmgworldmedia.com

Chemtex & Corrosion Middle East 2004
September 14 - 16, 2004
Conference, Exhibition; Dubai/U.A.E.
More Information from: Die Ingenieur Agentur, Frau Catherine Bernhardt
Postfach 1164,72627 Aichtal, Germany, Fax: +49 7127 566-49
http://www.ingenieur-agentur.de/CHEMEX, ingenieur-agentur-bernhardt@t-online.de

Paint Defect Analysis Workshop
September 14 - 16, 2004
Workshop; London, Ontario/Canada
More Information from: Paint Performance Consulting , 35585 Pound Road
Richmond, 48062 Michigan, USA, Fax: +1 586 727-27 24, http://www.paintperformanceconsulting.com, techservices@paintperformanceconsulting.com

Advanced Colour Measurement & Colour Control
September 15 - 16, 2004
Training Course; Teddington/Great Britain
More Information from: Paint Research Association


Functional Fillers for Plastics 2004
September 15 - 17, 2004
Conference; Hamburg/Germany
More Information from: Intertech , 19 Northbrook Drive , Portland, Maine 04105
USA, Fax: +1 207 781-2150, http://www.intertechusa.com , rjessie@intertechusa


FEICA European Adhesives Conference 2004
September 15 - 17, 2004
Congress; Ljubljana/Slovenia
More Information from:FEICA Association of European Adhesives Manufacturers
P.O.B. 23 01 69, 40087 Düsseldorf ,Germany, http://www.feica.com
marion.kraemer@feica.com

Paintindia 2004
September 16 - 18, 2004
Exhibition, Conference; Mumbai/India
More Information from: ExpoCon International , 126-A, Dhuruwadi
A.V. Nagvekar Marg, Prabhadevi, Mumbai 400 025, India, Fax: +91 (22) 430 0601, colorpub@vsnl.vsnl.com

12th International Coating Science & Technology Symposium
September 20 - 22, 2004
Symposium; Rochester, NY/USA
More Information from: ISCST, The MCC-Group Science & Technology Research Center ,1000, Kamoshida-cho, Aoba-ku ,Yokohama
Japan 227-8502, Fax: +1 805 659-1493
http://www.iscst.org ,iscst@thetiaragroup.com


1*1 der Nanotechnologie
September 21 - 22, 2004
Seminar; Dresden/Germany
More Information from:MSTI ,P.O. Box 1050 , 65836 Sulzbach/Ts, Germany
Fax: +49 6196 585-485, http://www.msti-aktuell.de ,
anmeldungen@iir.de


Coatings and Paint Technology Composition and Application Fundamentals
September 21 - 23, 2004
Course; Ypsilanti
More Information from: Coatings Research Institute - Eastern Michigan University 430 W. Forest Ave.,Ypsilanti, MI 48197, USA , Fax: +1 734 483 0085, http://www.emich.edu/public/coatings_research
sandy.tanner@emich.edu

Asia Coat 2004
September 21 - 23, 2004
Exhibition; Beijing/China
More Information from: CNCCC Chanzhou Paint & Coatings Chemical Industry Research Institute, Jichang Road , Changzhou, 213016 Jiangsu , China, Fax: +86 (519) 32 73 017 ,http://www.asiacoat.com , nci@asiacoat.com

Powder Coating 2004


September 21 - 23, 2004
Conference, Exhibition; Charlotte, North Carolina/USA
More Information from: Goyer Management , P.O. Box 54464 , 45254-0464 Cincinnati, OH, USA, Fax: +1 513 624-0601, http://www.pcishow.com
lmuck@one.net

APi Conference
September 22 - 24, 2004
Conference; Ulm/Germany
More Information from:Prof. Dr. Hans-Jürgen Adler
Technische Universität Dresden, Institut für Makromolekulare Chemie und Textilchemie 01062 Dresden , Germany, Fax: +49 351 463-7122
http://www.gdch.de, Hans-Juergen.Adler@chemie.tu-dresden.de

Color Technology
September 28 - 29, 2004
Course; Ypsilanti
More Information from: Coatings Research Institute , 430 W. Forest Ave.
Ypsilanti, MI 48197, USA, Fax: +1 734 483 0085, http://www.emich.edu/public/coatings_research, sandy.tanner@emich.edu

August 9 - 13, 2004 Davos/Switzerland
More Information from:Dr. F. Joseph Schork, School of Chemical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0100 . USA, Fax: +1 815 301-9729,http://www.che.gatech.edu/Davos   ,joseph.schork@che.gatech.edu 

 
 
       


     
 
  Powder Coater’s Manual ------- Control of Powder Spray Application Equipment (Part - 31)  
 
Voltage Controls
Corona charging guns have adjustable levels of voltage from 30 to 100 kilovolts. Variables in the application process, such as the powder material, the part being coated, the gun-to-target distance, will react differently to various levels of voltage and current draw. There is an optimum current level for the best possible first-pass transfer efficiency (FPTE) with a given set of variables. Typically, 10 to 20 mA (microamps) of gun current is the optimum range for the highest level of transfer efficiency. The lower current levels will help with penetration of Faraday cage areas. Flatter surfaces can be coated with the higher gun current level of 20 mA. As the space between the gun and the part is reduced, the voltage will
decrease and the current draw will increase. As the gun current level increases above the optimum level, more ions are created in the space between the gun and the part. The extra ions flow to the substrate at a much faster rate than the powder particles and quickly add charge to the surface, contributing to rapid development of back ionization. There is an important relationship: the current-to-surface ratio. The more concentrated the free ions are on a part surface, the more likely they are to create application problems. If a spray gun is moved closer to the surface the current draw will increase and the part surface will have more free ions. To make things even more difficult, the amount of surface that is being contacted by the field lines will be narrower when the electrode is closer to the surface so the excess free ions will be concentrated in a small area.

Notice in the figure on page III/36 how the field lines are concentrated in a smaller area when the gun comes closer to the part surface. This can cause rapid back ionization and application problems, especially considering that the current will increase and add more free ions when the gun moves closer. This can be expressed in the following
equation.
With a gun-to-part With a gun-to-part distance of 10”                distance of 3”
20 (mA) /8 (Sq. in.)                                                                            60 (mA) / 3(Sq. in.)


As the equation illustrates, the amount of current is greater and the amount of surface is less. Thus the amount of charge on the surface is significantly greater at close gun-to-target distances. With automatic application equipment, the voltage adjustment can be set and the current level will remain stable as long as the part geometry is not too irregular. If the part geometry is irregular, current may vary. In manual operations, the sprayer moves the gun in and out and the resulting current level varies considerably. In many cases, manual operators will come very close to the part surface and increase current well beyond the optimum level for good FPTE. creates the problems that are commonly associated with the corona gun and coating deposition. Gun manufacturers offer some devices to help prevent excess current draw and the rapid back ionization that can occur. Current limiting can be a feature of the gun controls and operate automatically or it can accomplished with fixed ion collectors.

Automatic Gun-Current Control
Automatic control of the gun-current allows you to set an optimum current level and maintain it, regardless of the gun-to-target distance. The control unit will automatically adjust the gun current output to maintain a consistent level that provides the maximum transfer efficiency. By controlling the current level to an optimum level, back
ionization is delayed, the finish is smoother and more uniform, and FPTE is improved.

The automatic control of the gun current helps reduce the generation of an excessive number of free ions and controls the field strength at the part surface. It reduces the voltage at the gun tip when the electrode gets closer to the surface and helps provide better coverage in Faraday cage areas. With the current draw controlled automatically, the load line reacts to
the resistivity of the circuit when the gun it moved in or out. The voltage is reduced and the current remains at a predetermined level. It may appear that the reduction in voltage will also reduce the field strength and charging efficiency of the spray gun. Actually, if the gun is moved closer to the part and the voltage is reduced the field strength
can remain the same.

 Field Strength = Voltage of the electrode/Gun-to-target distance


Free-ion Collecting Devices
A free-ion collector is a grounded electrode that is mounted on the gun behind the charging electrode. The ion collecting electrode functions like the counter-electrode, preventing the free-ions from contributing
to rapid surface charge on the part that causes back ionization. The ion collector is positioned closer to the charging electrode than the part surface. The electric field will follow the path of least resistance and develop between the gun electrode and the ion collector
rather than between the electrode and the part. As a result, the electric field near the part surface will be created by the space charge of the powder particles as they arrive at the surface. This will be a weaker field than what would be generated if the free ions were allowed to flow to the part. However, if the powder has sufficient charge the transfer efficiency will not be seriously lower and penetration will be enhanced.

There is an important ratio between these two distances. The ion collector must be closer to the electrode than the grounded substrate to perform but if it is too close to the electrode it will reduce the charging area to a point where charging efficiency will suffer. A typical starting point is to position the ion collector about one half the distance between the electrode and the part. In addition to providing improved Faraday cage penetration, a properly installed ion collector will help to avoid back ionization when recoating parts.

Because of the sensitive nature of the ratio of distance between the electrode tip, the ion collector, and the part surface, they are not equally effective in all situations. The area around the gun tip, that has a densely packed concentration of free ions available for charging, is shorter if the ion collector is too close to the electrode. The ion collector must be closer than the distance from the electrode and the part surface. At some point the ion collector will be too close to the gun tip and the charging zone will be so small that the time the powder particles spend passing through it will not be sufficient for the optimum charging efficiency and the overall transfer efficiency will be unacceptably low. 
 

 
   To be continued....  
 
   


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FEEDBACK
We are one of the biggest Ovens
producers both in China and some other countries Yours faithfully,

Karl Wong
Shanghai HCI Industry Co.,Ltd. Shanghai ,China
Dear Mr Soley,:
I wish we can contact with each other as usual. I want to keep long term relationship with you. After returning china, I will contact you at once.
Sincerely yours, Raymond hao, China (Presently in Korea)
Dear Sirs,
We are event management company. Now, we are planning to organise an exhibition on Coating, Adhesives, Inks and Paints With Best Regards,
Faisal Aftab Khan, Marketing & Promotion Associates,Karachi-75300 Pakistan.

        

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Vivek Soley (Moderator)
(India Powder Coating: The complete onweb solution)
3, Lalaram Nagar, Indore MP 452001, INDIA Phone 91 731 2492291 mobile 9826297112
http://www.ipconweb.com
email:
viveksoley@hotmail.com , minalsoley@eth.net

Please note our new email id viveksoley@ipconweb.com