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NOVEMBER 2007

Welcome to the November 2007 edition of the IPC e-newsletter. The IPC e newsletter is distributed free to more than 3000 people around the world.

This edition of the newsletter contains:

News features.

The Powder Coating Manual (Part 70)

Exhibitions and Conferences in November and December 2007

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. While we have used our best efforts in collecting and preparing the information on this newsletter, we do not assume, any liability for any loss or damage caused by errors or omissions, whether such errors or omissions resulted from negligence, accident or other causes. The user may use their own discretion while using the information.

If your e-mail program does not support HTML or if this e-newsletter does not appear correctly, please copy and paste the following URL in your web browser:

http://ipconweb.com/nom.htm 

 
 
Exhibition & Conference
for Radiation Curing
November 13 - 15, 2007
Vienna / Austria
_____________


Date: Nov. 21-23, 2007
Venue: Shanghai New International Expo Centre
2345, longyang Road,Pudong New Area, Shanghai 201204, P.R. China
 
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IPC e newsletters now available on CD.
We often get requests for previous editions of the IPC e newsletter. On popular demands we have put together the past editions of the newsletter on a CD. This CD includes IPC e newsletters from 2001, 2002, 2003,  2004, 2005, 2006 . The CD is available against a processing fee of Rs 500/- or USD 16.00  only. (plus Courier charges). 
 


 

  News  


Site update


Now you too can help us in composing the monthly newsletter.  As an experiment we have initiated a scratchpad wiki where you can add/delete/edit any information you like. Just click the "EDIT" button on the top of the wiki page and add/edit/delete the information you like. This is a new wiki concept. Allowing everyday users to create and edit a page in a website is exciting in that it encourages democratic use of the Web and promotes content composition by nontechnical users. This is an experiment A scratchpad. Please let us know your feedback

http://scratchpad.wikia.com/wiki/Ipc-e-newsletter 

We have introduced a couple of more pages on our website.

The Powder Coating Suppliers page.
(FREE OFFER)
Almost all the powder manufacturers have a dealer network present in most of he major cities. This is the link which connects the powder user to the powder manufacturer.  We invite all the powder dealers to promote there business through our new  page. As an introductory promotion of this page we offer a FREE listing on the powder coating suppliers for one year

The
 Touchup Paints  page
During production, often there are problems with the finishes of your products like nicks, scratches, or blemishes. With the aerosol touch up spray paints, these problems can be resolved fast and efficiently. Aerosol paint (spray paint)  Paint in a sealed pressurized container that is released in a fine spray mist when depressing a valve button located on the top of the can. When applied correctly, aerosol paint leaves a smooth, evenly coated surface, unlike many rolled or brushed paints. Standard sized cans are portable, inexpensive and easy to store. Aerosol primer can be applied directly to bare metal and many plastics. We invite manufacturers of these touch up paints to add there details to this new page.

Please visit www.ipconweb.com/listing.htm for other promotion options

 

 

   Infomercial from Mitsuba Systems  
   
   
Automatic Powder Coating Package

 


 

 
Automatic Powder Coating Package-

In the new world of hyper competition automation is your competitive advantage. Powder coaters across the world are reaping the benefit of Mitsubas automatic powder coating package.
Mitsuba’s experience having set up hundred’s of automatic plant will help you reduce your labour charges and step up productivity. Automation will also ensure consistent coating quality. With the Patented Infiniti Technology (U.S. Patent No. 5678770) rest assured of the longevity of the gun.

The Mitsuba Automatic System consists of:
  Automatic Guns.
  Electromechanical Reciprocators
  Spray Booth with Recovery
  Powder Management System to Recycle Over-Sprayed Powder and mix with fresh Powder in     Desired Proportion.
  Magic Eye Powder optimization hardware.

Automatic guns are mounted on Electro Mechanical Reciprocators. These have variable stroke and speed to ensure enhanced flexibility to coat a wide variety of products.

The reciprocator is electrically driven via an AC geared motor giving a gentle and distinct motion. The advanced control system of the reciprocator is designed to control reciprocating speed, stroke length & multi – speed operations, thus ensuring the best possible coating results. Each reciprocator can accommodate up to 8 automatic guns and can be used where high line speeds are employed.

The Magic Eye part sensing systems will automatically maintain part to gun distance. That means if you coating a box, then gun, which is mounted on reciprocator, will move backward. And if flat sheet is coated after box, gun, which is mounted on reciprocator, will automatically move forward to maintain desired gun to part distance. It will smartly select optimum number of guns required to be keep on. It will automatically switch off the gun when there is no part in front of the guns. This will reduce over spray of powder.

For higher productivity and a relaxed state of mind use Mitsuba powder optimization hardware with Automatic powder coating package.

Follow the link to view the video of Mitsuba Automatic powder coating plant in operation http://www.youtube.com/watch?v=2aIW9ZbSJlw 


To know more about Mitsuba products please visit www.powdergun.com  or

Contact us at:
Mitsuba Systems (India) Pvt Ltd,
34/H, Laxmi Indl Estate,
New Link Road, Andheri (W),
Mumbai – 400 053.
Tel : 022-2631 8633 /2633 4735/66924151/66924154
Fax-022-66924154
Email : mitsuba@vsnl.com 
   


 


 

 

Infomercial from Vijay Enterprises Pvt. Ltd

Vijay Enterprises Pvt. Ltd.


Vijay Enterprises is a leading manufacture of powder coating materials (PCM) in India. VIJAY COAT today stands as a Reliable source of High Quality and Durable Powder Coating materials at very reasonable prices. Vijay's PCM find extensive application for industrial and other demanding applications. Vijay enterprises was incorporated in 1995 with a view to supplying quality PCMs to Indian industry. Vijay's manufacturing set up is equipped with best machines from M/s Buss AG Switzerland who are world's largest manufacturer of Powder Coating Machines. Vijay has now established itself and earned a name for its quality supplies and prompt delivery at very economic prices. VIJAY has multi-locational production facilities near Ahmedabad in western India and at Silvassa in the U T of Dadra & Nagar Haveli, 200 Kms off Mumbai. This makes it a competitive source of PCMs to all customers. 

Vijay Enterprises Pvt. Ltd.

Admin. Office :
103, Gita Bhavan, 1st Floor, Opp. Vijay Transport,
Narol Char Rasta, AHMEDABAD 382 405.
GUJARAT. INDIA.
Telephone: +91-79-2532 9057, 25329374,Fax: +91-79-2535 9481
Email: jayesh@icenet.net
web: vijay-powdercoat.com  



 

Job Opportunities
FREE
Often we receive emails with no contents but a resume word document attachment.
This column could be of use for such people, those who are looking our for better prospects.
Use this space to publish your mini resume in the format  given in the adjacent column. You may or may not reveal your identity. Send us these details and we will put it this column
 
Name: abc xyz
Age: ab
Feild of work: ajkfhkj, asjhas, asdjhkasd, aasdkj
Email : abc@xyz.com
Link to resume: www.xyz.com


 

IPC Classified
Your message here
You can reach thousands of people thorough our classified ads. Place your own classified text  ads. or messages  here Just for Rs 500 (USD 10) only

Contact the moderator for details
India Powder Coating
Vivek Soley
3, Lalaram Nagar, Indore, 452001 MP India
Phone 91 731 2492291
Mobile 9826297112
emails:   viveksoley@hotmail.com viveksoley@ipconweb.com , indiapowdercoating@yahoo.com
Wanted
Distributors / Freelancers / Engineers for sales and services  of Mitsuba Products throughout India.

Contact

Mitsuba Systems (India) Pvt Ltd,
34/H, Laxmi Indl Estate,
New Link Road, Andheri (W),
Mumbai – 400 053.
Tel : 022-2631 8633 /2633 4735/66924151/66924154
Fax-022-66924154
Email : mitsuba@vsnl.com 



 

Infomercial from
Statfield Equipments Pvt. Ltd.

Automation with Statfield

Automation of powder coating becomes easy with Statfield

In today’s industrial fast moving world speedy production and accuracy in quality plays vital role. To cope up with these requirements automation of plant is the option one can think of.

Statfield introduces its automatic powder coating equipment “RECIPROCATOR” which has qualities to withstand all these expectations. Reciprocator moves up and down and coat article completely. It works continuously and results into faster and higher production. You can increase the number of guns to be mounted on reciprocator for speedy production. It gives uniform coating thickness & finish which eliminates human error to some extent. This reduces labor dependency and wastages of uneven coatings. By this, the coating cost is considerably saved and labor involvement is minimized.

The Reciprocator is operator friendly & consistent in performance. It is very easy to adjust stroke length as per articles length and operator’s choice. The robust design coupled with Statfield's unique design makes this a trouble free and maintenance free machine.

Features:
Variable stroke length to suit article height.

Variable speed.

Programmable zone control.

Adjustment of stroke and speed of reciprocator to suit individual application

Smooth reversal at the end of stroke which ensures excellent coverage for article surface with poor access.

User friendly 15 key keyboard allows operator to perform all the required functions with his finger tips.

System can withstand wide variation in voltage.

Error message display facility is provided to detect the fault easily.

Hooters warning for every error.

Maintenance free lubricated gear box.

On your present conveyorised plant we can mount our reciprocator.



For further details contact:
Statfield Equipments Pvt. Ltd.
H.O & Works :- 1073 / 1,2,3 Mutha Road, Pirangoot, pune - 412 111 Tel No. 020-2292 2180/1/2 Fax No. - 020-6652 4695
Mailing Address :- 9/10, Laxman Villa, Near Jog Hospital, Paud Road, Pune - 411 038 Tel No. 020-2543 1450 / 2544 7147 Fax No. - 020- 2543 2349
Email - marketing@statfieldequipments.com
www.intechfinishing.com




VISIT
During his visit to Indore, Gopinath Murthy, General Manager Hexagon Technologies India, visited our office. He introduced us to the ITW GEMA Optiflex machine which has a unique DVC (Digital Valve Control) feature. The patented DVC technology guarantees a highly precise output and reproducible coating results and very high transfer efficiency. Upto 20 coating programs can be stored in the control Unit. The ROI ( return on investment ) is much faster as the DVC, and 100kv charging ensures powder saving . Until now the it has been a general perception that imported machines are much too expensive than their Indian equivalents. This new generation manual coating equipment is different form the existing models. The price differwidth=194ence is not huge. The result of this can be seen as a very high sales growth since its launch two years ago.

Gopinath appreciated the role of our website in the powder coating. "It has created a common platform for the powder coating community" he said, and has assured regular contribution of academic value to our website.

Hexagon technologies is the authorised distributor for ITW gema Electrostatic Powder Coating Equipment in India Since 2000.




Nordson Debuts Generation II Dense-Phase Powder Coating Technology for Prodigy  Coating Systems

The new Prodigy(R) Generation II spray system from Nordson significantly raises the bar for dense-phase powder coating performance and color-change speed originally set by the company's first Prodigy HDLV technology. It also sets a new standard for speed of application and ease-of-use, making the painter's job even easier.

Dense phase powder transport and application technology, for which Nordson has trademarked the acronym HDLV, is a revolutionary new method of delivering powder from the storage/conditioning device such as a conventional fluidized hopper, or locally fluidized vibratory box feeder, to a manual or automatic spray gun, using "High-Density" powder flow and "Low-Velocity" conveyance air.

In a bulk powder transfer and gun pump applications, conveyance air is dramatically reduced, producing a very low-velocity, highly dense with powder, spray pattern from the gun, that provides a multitude of coating performance and operational benefits. Faster application capability, more complete coating coverage, and higher transfer efficiency to name just a few.

Several new Generation II enhancements to the original Prodigy gun, pump and associated components further improve ease-of-use and durability, for even more consistent and repeatable coating performance.

"Nordson HDLV brings more performance and value to any manual powder coating operation," says Robert Allsop, Marketing Manager, Nordson Industrial Coatings Systems. "The gun is nearly 20 percent lighter in weight, for incredible balance that's instantly recognized.

"And, when combined with its improved reach and maneuverability into tight space in, around and between parts, makes coating with Prodigy easier than ever."

Other gun enhancements include a totally re-designed barrel that accommodates a new, more durable, yet more flexible powder delivery hose. The hose now easily, and more securely, attaches at the very front of the gun, eliminating intermediate components and connections.

The new gun control cable is more rugged for longer service life, especially in demanding operations requiring more varied and frequent gun manipulation.

Optional, lightweight Prodigy Generation II lance extensions are now available in two lengths for coating operations requiring extended reach.

The Prodigy HDLV Generation II gun pump features include a new, longer- life pinch valve and more durable injection-molded pump body. Their combined geometries dramatically increase pinch valve wear life. The new pump body also ensures more secure assembly and provides additional ground contact for an extra measure of grounding integrity of the entire system.

Other gun pump enhancements are a new, longer-life check valve and more durable, metal filter disc.

Nordson now also offers a check valve upgrade kit to bring existing high- capacity transfer pumps up to the latest Prodigy HDLV design.

Kansai Nerolac targets premium segment
NEW DELHI: Kansai Nerolac Paints has tied up with fashion designer Manish Malhotra as a part of its strategy to establish itself as a premium brand. The company is targeting a 20-22% share in the premium category in three years.

“We are looking at premium positioning of the brand by offering latest range of designer finishes which help consumers to make a style statement,” Kansai Nerolac general manager Venugopal C said. He said the premium-end category was the fastest growing segment in which the company enjoys 12-14% market share.

“Activities like tie-up with Walt Disney, launch of metallic finish paints and other designer finishes have helped more than double the market share from 6% to around 14%,” he said. With the help of such initiatives, Kansai Nerolac was aiming at the lifestlye category.

“Continuing with the company’s plan of offering innovative products and creations into the Indian paint market, Nerolac Colour Styles 07-08 closely relates moods to colours,” Kansai Nerolac vice-president, marketing and sales (decorative), Anuj Jain said.

Asian Paints Q2 net profit up 39.81% at Rs 108.44 cr
MUMBAI: Asian Paints reported 39.81 per cent rise in net profit for quarter ended September at Rs 108.44 crore as compared with Rs 77.56 crore during the same quarter a year ago.

Total income increased 15.34 per cent to Rs 916.91 crore from Rs 794.95 crore in the corresponding quarter previous year.

Asian Paints Group’s net profit was up 37.63 per cent at Rs 113.86 crore during September quarter from Rs 82.73 crore in the same quarter a year ago.

Total income climbed up 15.06 per cent to Rs 1159.62 crore from Rs 1007.86 crore. <more>

Setu due for special effects
- A GARLAND OF LIGHTS, A COAT OF COLOUR

A Rs 6-crore scheme has been drawn up to beautify Vidyasagar Setu.
After Howrah bridge, it’s the turn of Vidyasagar Setu to don a new look. By December, the 15-year-old Setu will be illuminated and given a coat of paint as part of a Rs 6-crore scheme of the Hooghly River Bridge Commissioners (HRBC), the custodian of the structure.

“Philips has designed a lighting scheme for the bridge. We’ve asked the company to restrict the cost to Rs 5 crore. The annual electricity charges will be around Rs 30 lakh,” said a state transport department official.

Paint manufacturers — including Asian Paints, Berger and Jenson & Nicholson — have been asked to provide samples. “These will be used by computer applicators to work out combinations that will suit the structure,” said an HRBC official.

Transport secretary Sumantra Chowdhury said the beautification is likely to be complete by December. “In addition, the Park Street and Gariahat flyovers will be painted by the Puja. The HRBC will fund these projects,” he added.

CPS Color
CPS Color, the leading supplier of advanced tinting systems, has enlarged its production facilities in India. After the expansion the total area is 4,720 sq m making the production area double the size. Also, the spare parts warehouse area has increased and is now triple the size it was before.

CPS Color’s Indian manufacturing facility was set up in 1997 in Daman. The factory supplies COROBTM dispensing equipment and mixers to Europe, South America and North America in addition to the local markets. To be able to respond to the increasing demand resulting from the current and future market growth of the paint industry, CPS Color decided to increase its equipment production capacity of its Indian factory.

“Our goal is to grow faster than the market average. The enlargement of our Indian factory will make it possible to increase our global production capacity to fulfil the needs of the global markets but also to support our growth goal,” said Arto Metsänen, CEO at CPS Color Group Oy in Finland.

Following the expansion, CPS Color India now has production lines defined for all individual models. Next to each production line there is space for the raw material stock, making production processes faster and smoother. “With this expansion we have been able to organise the production lines so that the raw materials will come in from one end and the ready made products will go out from the other end. As a result we can shorten our delivery times,” explained Eero Hinkkanen, Managing Director at CPS Color India.

At the same time as production facilities were extended CPS Color could also improve employees’ social facilities, safety systems and security of the plant

Sherwin-Williams
The paint industry in India is on the verge of entering into organised retailing. Nippon Paint of Japan will expand through exclusive stores numbering 120 in the next 12-18 months. It follows the company’s recent entry into India’s decorative paint market. In addition, Sherwin-Williams is planning to occupy exclusive shelf space in Reliance Retail outlets.

Meanwhile, the indigenous producers will continue to push ahead; Kansai Nerolac will set up 30-40 self-branded stores in the next 12-18 months and Asian Paints will also increase the number of its exclusive stores. (Source: India Business Insight, 10 October 2007)


DuPont Titanium Technologies Announces a Price Increase for Titanium Dioxide Products in Europe
WILMINGTON, Del., Oct. 8 /PRNewswire-FirstCall/ -- DuPont Titanium Technologies today announced a price increase for all DuPont titanium dioxide (TiO2) grades sold in Europe.

Effective Oct. 15, 2007, or as permitted by contract, prices for DuPont coatings, plastics, specialty, paper, and laminate titanium dioxide grades will increase 90 Euros per metric ton in Europe.

The modest increases implemented to date in 2007 still leave prices well below the levels required to offset both recent structural cost increases as well as ongoing cost increases. DuPont Titanium Technologies will continue to work to offset these increases in the cost structure with productivity initiatives, but such initiatives alone cannot be expected to offset the significant increases to costs.

"The rapidity of cost increases requires us to renegotiate contracts that provide for the delayed implementation of announced price increases," said Ian Edwards, global business director of DuPont Titanium Technologies. "At a time when the market for many of our purchased materials and services is extremely volatile, we must have the ability to respond to those cost pressures quickly if we are to remain competitive."<more>


CHINACOAT
The CHINACOAT series of exhibition has become the industry's most prestigious and popular event. Every November, the pulse of the global coatings industry beats in Shanghai or Guangzhou.

CHINACOAT2007 will be held in the beautiful city of Shanghai. Over 656 companies from 32 countries and regions met 21,273 visitors when the show was held here in the year of 2005. The show and the concurrent conferences and seminars enable suppliers, producers and end-users of coatings to explore the need of a growing market, and discover insights to the tremendous opportunities and stimulating future that lie ahead.


Acquisitive PPG Industries buys paints, coatings group SigmaKalon from Bain Capital

Pittsburgh, USA, based PPG Industries Inc is buying SigmaKalon Group, the Uithoorn, Netherlands-based coatings producer, from private equity major Bain Capital for €2.2 billion ($3.1 billion), including debt.

The deal, which is subject to regulatory approvals, will help PPG expand its operations in Europe and Asia. In Europe, where SigmaKalon is the second-largest coatings company, PPG's sales will more than double with the acquisition.

SigmaKalon is the result of a 1999 merger of British decorative paints producer Kalon Group, a subsidiary of Total SA of France, and Sigma Coatings, a subsidiary of Belgian oil producer Petrofina. The company, which had revenues of about $2.76 billion in 2006, was acquired by Bain in 2003.

SigmaKalon's brands include Sigma Coatings, Johnstone's, Leyland, Primalex and Seigneurie. The company, which has a significant presence in Eastern Europe, recently acquired an architectural coatings firm in China<more>

Akzo Nobel Q3 results disappoint analysts
Dutch paint and chemical company Akzo Nobel reported on Tuesday that its third quarter profit, before interest and tax, was up 11% on the same period last year to €244m.
The result was below analysts’ expectations of €255m, reports ANP news service.
The company’s turnover in the third quarter was 2% higher at €2.6bn due largely to autonomous growth of 5%. <more>

Akzo Nobel announces details of proposed ICI acquisition
Akzo Nobel N.V. has published the agenda and accompanying Shareholders' Circular for next month's Extraordinary General Meeting of Shareholders. The Circular relating to the EGM -which is due to be held on November 5, 2007 - explains that, subject to the approval of the shareholders of Akzo Nobel and ICI, and certain other conditions precedent, completion of the ICI deal is currently expected to take place on January 2, 2008. Management estimates that the operating cost savings and other synergies relating to the ICI paints business will result in a total post-tax net present value benefit of approximately EUR 2.5 billion after implementation costs. Akzo Nobel intends to find a new owner for ICI's Specialty Starches activities and plans to retain ICI's Specialty Polymers business.

International Paint LLC Introduces Fireproofing Coating for Railcars

Houston, Texas-based International Paint LLC, a provider of high-performance coatings, has introduced Chartek 4901FRA, a new epoxy-based intumescent fireproofing technology specially designed for the rail industry.

Chartek 4901FRA is a high-performance, high-build, solvent-free epoxy intumescent engineered to protect steel, aluminum, and other substrates from hydrocarbon and cellulosic fires. The proprietary formulation offers good adhesion and durability properties for unparalleled impact and explosion resistance, jet fire protection, and corrosion control, the company says. <more>

New Powder Coating Protects Marine Vessel Hulls
Xiom Corp., Long Island, NY, has developed a new high-performance, environmentally safe, self-cleaning, marine vessel hull protective coating. The new “stay-clean,” patent-pending powder coating for both steel and fiberglass boat bottoms is designed to reduce maintenance costs and fuel consumption caused by marine growth. The easy-to-apply polymer/ceramic-based coating contains no tributyl tin (TBT) or volatile organic compounds (VOCs), and it does not ablate or wear away. The coating contains a network of evenly dispersed active copper oxide and silver ions in a polymer matrix that is fully melted when applied with Xiom’s proprietary thermal spray process. The polymer matrix serves to hold the copper oxide in place for years. Even if there should be some break or “tear” in the coating, a nylon-modified fuse-bond epoxy between the hull and the coating maintain the coating’s integrity. The coating ablates at less than 1/10 the ablation rate of paints, while providing superior protection. <more>


Infobit
Ice Blast
What is Dry Ice Blast Cleaning?
CO2 Blasting Has Been Successfully Used In Many different Industrial Applications Cold Jet blasting is an effective and cost-effective way for many industries to maximize production capability and quality. Blasting is used to manage production residues, release agents and contaminants; it is successful in stripping paints, oils and biofilms; and is used for many general cleaning applications. This dry blasting process is non-abrasive, nonflammable and nonconductive. Cold Jet systems may therefore be used without damaging active electrical or mechanical parts or creating fire hazards.
Watch a quick animation demonstrating how dry ice blasting technology works.

Cold Jet blasting uses compressed air to accelerate frozen carbon dioxide (CO2) "dry ice" pellets to a high velocity. A compressed air supply of 80 PSI/50 scfm can be used in this process. Dry ice pellets can be made on-site or supplied. Pellets are made from food grade carbon dioxide that has been specifically approved by the FDA, the EPA and the USDA.

Carbon dioxide is a non-poisonous, liquefied gas, which is both inexpensive and easily stored at work sites.

How does CO2 Blasting Work?

CO2 blasting works because of three primary factors: pellet kinetic energy, thermal shock effect and thermal-kinetic effect. Cold Jet optimizes blast performance for each application by combining these forces and adjusting:

compressed air pressure
blast nozzle type (velocity distribution)
CO2 pellet size and density
pellet mass rate and flux density (particles per unit area per second)

Pellet Kinetic Energy

The Cold Jet process incorporates high velocity (supersonic) nozzles for surface preparation and coating removal applications. Since kinetic impact force is a product of the pellet mass and velocity over time, the Cold Jet delivery system achieves the greatest impact force possible from a solid CO2 pellet by propelling the pellets to the highest velocities attainable in the blasting industry.

Even at high impact velocities and direct head-on impact angles, the kinetic effect of solid CO2 pellets is minimal when compared to other media (grit, sand, PMB). This is due to the relative softness of a solid CO2, which is not as dense and hard, as other projectile media. Also, the pellet changes phase from a solid to a gas almost instantaneously upon impact, which effectively provides an almost nonexistent coefficient of restitution in the impact equation. Very little impact energy is transferred into the coating or substrate, so the Cold Jet blasting process is considered to be nonabrasive.

Thermal Shock Effect
Instantaneous sublimation (phase change from solid to gas) of CO2 pellet upon impact absorbs maximum heat from the very thin top layer of surface coating or contaminant. Maximum heat is absorbed due to latent heat of sublimation.

The very rapid transfer of heat into the pellet from the coating top layer creates an extremely large temperature differential between successive micro-layers within the coating. This sharp thermal gradient produces localized high shear stresses between the micro-layers. The shear stresses produced are also dependent upon the coating thermal conductivity and thermal coefficient of expansion / contraction, as well as the thermal mass of the underlying substrate. The high shear produced over a very brief expanse of time causes rapid micro-crack propagation between the layers leading to contamination and/or coating final bond failure at the surface of the substrate.

Thermal-Kinetic Effect
The combined impact energy dissipation and extremely rapid heat transfer between the pellet and the surface cause instantaneous sublimation of the solid CO2 into gas. The gas expands to nearly 800 times the volume of the pellet in a few milliseconds in what is effectively a "Micro-explosion" at the point of impact.

The "Micro-explosion," as the pellet changes to gas, is further enhanced for lifting thermally-fractured coating particles from the substrate. This is because of the pellet's lack of rebound energy, which tends to distribute its mass along the surface during the impact. The CO2 gas expands outward along the surface and its resulting "explosion shock front" effectively provides an area of high pressure focused between the surface and the thermally fractured coating particles. This results in a very efficient lifting force to carry the particles away from the surface.
 

 

 

 

  Seminar Events Exhibitions  



European Coatings WebSeminar: Coatings - Module Fillers
31.10. - 1.11. 2007
Internet
Vincentz Network

Self-Adhesive Technology Seminar
6.11. - 7.11. 2007
Amsterdam/The Netherlands
AWA Alexander Watson Associates

Performance Planning and Evaluation
7.11. 2007
Ypsilanti, MI/USA
Eastern Michigan University


Principles and Practices of Coating Formulations
7.11. - 8.11. 2007
Ypsilanti, MI/USA
Eastern Michigan University

High Performance and Functional Pigments 2007
12.11. - 14.11. 2007
Louisville, KY/USA
Intertech Pira

Automotive Topcoat School
13.11. - 16.11. 2007
Ypsilanti, MI/USA
Eastern Michigan University, Coatings Research Institute, Sandra Tanner

RadTech Europe 2007 Conference & Exhibition, Europe's Event for UV/EB Curing
13.11. - 15.11. 2007
Vienna/Austria
Vincentz Network

Inaugural TZMI Congress 2007: Asia in Focus
14.11. - 16.11. 2007
Singapore
TZ Minerals International Pty Ltd., Kelley Yeats

Formula V: 5th Conference on Formulation Technology
19.11. - 22.11. 2007
Potsdam/Germany
Dechema e.V., Matthias Neumann Details ...

European Coatings WebSeminar: Coatings - Module Additives
19.11. - 22.11. 2007
Internet
Vincentz Network

Resins & Additives: Widening Formulation Options in Waterborne Coatings
19.11. - 20.11. 2007
Shanghai/China
ChinaCoat Exhibition Ltd.

Central European Coatings Show 2007
21.11. - 22.11. 2007
Prague/Czech Republic
The Coatings Group

Coatings for Wood & Wood Based Substrates
22.11. 2007
Hampton/UK
PRA Coatings Technology Centre

European Coatings WebSeminar: Coatings - Module Solvents
26.11. - 29.11. 2007
Internet
Vincentz Network

Understanding the Wet & Dry Properties of Coatings
27.11. - 28.11. 2007
Hamptin (West London), UK
PRA Coatings Technology Centre

European Coatings Conference: Easy.to-Clean/Self-Cleaning Coatings
29.11. - 30.11. 2007
Berlin/Germany
Vincentz Network


Surface Technology and Functional Coatings
3.12. - 4.12. 2007
Ermatingen/Switzerland
Deutsche Gesellschaft für Materialkunde e.V., Niels Parusel

European Coatings WebSeminar: Module Coatings formulation
3.12. - 5.12. 2007
Internet
Vincentz Network


 

 


 

 

  Powder Coating Manual, Trouble shooting (Part - 70)  

4 Masking
When a manufactured part is powder coated there may be certain areas of the surface that must be free of coating. For example, threaded areas may not fit properly if they are coated. Bearing surfaces with close tolerance cannot be coated. Some parts may require a bare spot for electrical-grounding contact. It is important to select a mask that is  effective, easy to use and reasonable in cost. Masking parts will add additional labor to the coating process. It is important to understand the different types of masks that can be used. Masking can be as simple as placing a plug in a single hole or it may require a specially made mask or fixture. One large hole in a large part will require very little labor while some smaller parts may have numerous spots that need masking and require a lot of labor. Selection of the right masking procedure will affect the cost of the part. The mask must be reasonable in cost and it must do an effective job of keeping the coating off the masked surface. There are many commercially available masking materials for and
powder coated parts. Tapes, plugs, caps and steel fixtures can be used. These cost and benefit issues are considered to determine the best possible way to mask a part:

• the cost per mask
• the number of times it can be reused
• the effectiveness of the mask
• the ease of application and removal
• ability to leave a clean parting line between the mask edge and the coating
• the need to be stripped and the frequency
• the temperature resistance of the mask material
• the ease of removal of adhesive backing

Tapes
A variety of different tapes are available for masking. They can be ordered cut in a particular pattern and size, in rolls of different sized discs, or in continuous rolls that can be cut to size. Different types of tapes are available for different applications.
There are many other tapes available including the ones listed in the chart below as well as 3M masking tape, high-temperature tape,
polyethylene tape and others. Each tape has its own features and is suited to a particular task. Be sure to select a tape that has the properties that are needed for the process.

Temperature resistance and the nature of the adhesive backing are particularly important. The tape must be able to withstand the cure oven temperature and the adhesive should be easy to remove without extra effort or secondary operations. Polyester tape with silicone adhesive is commonly used for powder coating.

Selection of a particular tape may require some testing. Contact a supplier of tapes and get samples for trial. Balance the cost with the proper performance. Remember that the tape must stand up to the process (water, chemical, thermal, abrasion) it must be economical, it must be easy to apply and remove, it cannot leave adhesive on the part surface, and it must be within certain cost limitations.

Tapes are excellent for covering spots on parts that need to be free of powder coating. They can also cover holes or threads. Tapes are flexible and usually cost effective.Plugs & Caps

Many different types of caps and plugs are used to cover threaded studs, bosses, and holes. The cost is reasonable and they can be reused or left in place. They usually seal the masked area very effectively and they are less likely to “bridge” to the coating and create a rough parting line than a metal mask. There are many standard sizes available and they can also be custom made to fit a certain product.

Specific sizes can be purchased at a reasonable cost in quantity. Sample  kits with a variety of different plugs can be purchased to test different sizes and see what works best in a given situation. It is a good idea to have an assortment of sizes and styles around for product testing. Caps and plugs are made of PVC, neoprene, silicone and other thermoplastic materials. The correct type for a specific masking job depends on the price and cure process. High temperature materials are required for powder coating operations. For example, silicone plugs may be capable of withstanding temperatures of 600 °F (315 °C). Neoprene is usually only good to temperatures of 275 °F to 350 °F (135 °C to 177 °C). Select a material that will meet all of the demands of the process for a fair price.

Masks Built into the Rack
In some cases, the best way to mask a part is by building the mask into the hanging fixture. A rack contact made with a piece rod can be fitted into a hole to mask the hole. A piece of tubing or a rod-coupling nut can be used to hold the part onto the rack and provide masking. The end of the part can be inserted into a pipe to keep the coating off the end.

The obvious advantage is that the labor of putting on and removing the mask is eliminated. The cost of the fixture is higher but it can be used indefinitely without replacement.

Throw Away Masks
In some cases, the mask can be used once and then thrown away. For example, one powder coater uses dixie cups to fill a hole in the center of the part. The dixie cup is inserted between the dry-off oven and the powder booth, the part is coated, and the cup is removed as the part exits the booth.

The cup keeps the powder from penetrating into the hole and then is thrown away. Any other type of mask would need to be high-temperature resistant and thus cost more. Also, when the mask is removed before curing, the edge line is clean. Removal of a mask after cure can cause a ragged parting line at the edge of the mask. Other types of throw-away masks include Mylar stuffed into holes,
corks, tooth picks, and paper. These masks are almost always removed prior to cure. This can be a low-cost and effective way to mask in some cases.

The Use of Air for Powder Removal
In some cases, air is used to remove the freshly applied powder coating material before it is cured. Low velocity air can be used to blow off a certain area or to vacuum powder from a surface. This eliminates the cost of masking materials and it provides a clean parting line at the coated edge.

Air blow-off or vacuum removal of powder requires precision design and execution for repeatable accuracy. It is not a good alternative where the number of holes or studs to be masked in so high that the operator will not be able to keep up. It may also require the operator to touch the part, possibly causing surface defects.Machining After Coating Some parts are difficult to mask and will require machining after they are coated. Machining the coating off of the part after coating is labor intensive but it does eliminate the cost of the mask and the labor to apply and remove it from the part. In some cases the machining operation
is necessary anyway.

Parts that will be machined after coating should be sampled to make sure that the coating will not melt or otherwise break down at the edge of the machined area.

Summary
Masking is a very important step in the coating process. It is labor intensive and expensive. The type of masking material and its properties will be important to the effectiveness of the mask and its impact on production efficiency.

Keep in mind that any mask that is used must be efficient to apply and remove, it must be effective at keeping the coating from the target surface, it must stand up to the rigors of the process, and it must be cost effective.
 

 


 

 

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