Basic Electrostatic Spray Finishing - Elliott …

1 Basic Electrostatic Spray Finishing Concept and Theory to Use This to Electrostatic Spray Use Electrostatic Spray Finishing ?..3 Types of Electrostatic Particle Among Charged Spray Finishing Electrostatic Spray Finishing Finishing of Electrostatic Spray Wraparound Electrostatic Equipment Voltage Power and Equipment Electrical Non-Electrical Flammable Coating Nonflammable Coating Safety Electrostatic Spray Finishingi Table of ContentsBelow is a listing of trademarksused in this document:PROAA 4500 PRO 3500 PRO 4500 Graco, Box 1441 Minneapolis, MN 55440-1441 1995 Graco, Inc., Form No. 321-028 8/95 Printed in to Basic Electrostatic Spray Finishing , a learning module in Graco s Basic concept andtheory sales training curriculum.

2 Your understanding of the information in this module providesthe basis for further study of specific Graco products. Your ability to successfully promote and sellGraco s products depends in part on how well you learn the basics and then apply this knowledgeto addressing your customers needs for Graco equipment. While this curriculum best fits the requirements of Graco and distributor sales people, it will alsobenefit anyone whose job function depends on knowledge of Graco s products. Module OverviewThis module introduces Basic information on Electrostatic Spray Finishing processes, including theunderlying terms, concepts, and principles. You will understand how Electrostatic charging can beused with a variety of Spray Finishing systems to improve Spray transfer efficiency.

3 How to Use This ModuleThe curriculum consists of a series of self-study modules. As the term self-study implies, you workthrough the materials on your own at a comfortable pace. Plan sufficient time (approximately 30 minutes) to complete at least one section of a module in a working session. This module combines a variety of features that make the learning process convenient and productive: Learning objectives Text Charts and illustrations Progress checks Additional resourcesLearning ObjectivesEach section of materials offers a set of learning objectives. Read the objectives and use them toguide you to the most important concepts. After you finish each section and before you completethe progress check, reread the learning objectives to confirm that you understand the key concepts.

4 TextDefinitions, examples, and explanations comprise the learning module text. Read it carefully andreturn for review if Electrostatic Spray Finishing1 Charts and IllustrationsAn important element of any instruction is visualizing the concepts. This module contains graphicsand illustrations to enhance the text material. Whenever appropriate, the module also containscharts that help you organize or summarize information. Progress ChecksProgress checks are self-tests that provide reinforcement and confirm your understanding of important topics. After completing each major section of the module, return to review the objectives, and then work through each of the progress check items. Upon completion, check youranswers against those provided.

5 If you answered any incorrectly, return to the text and reread thepertinent information. Additional ResourcesThis module may refer you to other documents or sources that expand on the concepts covered inthe module. The reference will include the name of the source and how you can obtain Electrostatic Spray Finishing2 Introduction to Electrostatic Spray FinishingLearning ObjectivesThis section provides a foundation for learning about Electrostatic Spray Finishing . The term electro-staticsor Electrostatic Spray finishingrefers to a Spray Finishing process in which electrical charges andelectric fields are used to attract particles of atomized coating material to the target (the object to becoated). In the most common types of Electrostatic systems, electrical charges are applied to thecoating material and the target is grounded, creating an electric field.

6 The charged particles of coating material are drawn by the electric field to the surface of the grounded target because of theattraction of opposing electrical charges. Other, less common types of Electrostatic systems apply anelectrical charge to the target and ground the coating material, or apply opposite electrical chargesto the coating material and the target. After completing this introduction to Electrostatic Spray Finishing , you will be able to: Define the term electrostaticsas it applies to Spray Finishing . Discuss how Electrostatic Spray charging is used to improve the transfer efficiency of Spray Finishing . Name several types of Spray Finishing systems with which electrostatics are used. Recognize key terms used to discuss Electrostatic Spray charging.

7 Why Use Electrostatic Spray Finishing ? Electrostatic Spray charging improves the transfer efficiency of Spray Finishing equipment. Thetransfer efficiency improvements occur because the Electrostatic forces help overcome other forces,such as momentum and air flow, that can cause the atomized materials to miss the intended methods save coating material, time, and labor. More of the material is attracted to andadheres to the target, and less material is lost in the Spray booth and the surrounding methods also lower solvent emissions into the air since less coating material is neededto coat each of Electrostatic SystemsElectrostatic Spray Finishing systems can be either automatic or Electrostatic SystemsThe automatic Electrostatic systems include: High speed rotational (stationary or reciprocating) atomizers Reciprocating discs Automatic air Spray , airless, air assisted airless, or HVLP Spray gunsBasic Electrostatic Spray Finishing3 Manual Electrostatic SystemsThe manual Electrostatic systems include.

8 Airspray Electrostatic hand-held Spray guns Air-Assisted Airless Electrostatic hand-held Spray guns Airless Electrostatic hand-held Spray guns HVLP Electrostatic hand-held Spray guns Hand-held rotary atomizer systemsThe manual and automatic Electrostatic systems listed above are discussed in greater detail in themodules of this training that cover specific Graco products. Figure 1 shows examples of manualand automatic Electrostatic 1 Manual and automatic Electrostatic Spray Finishing systemsBasic Electrostatic Spray Finishing4 MANUAL Electrostatic SYSTEMAUTOMATIC Electrostatic SYSTEMAir supplyGroundwireGround wireFluid supplyFluid supplyAutomaticgunFiber optic lineVoltage & currentdisplay (readout)PneumaticcontrolsElectricallyco nductive grounded air hoseGracoelectrostatic Spray gun0504605047 Key TermsFigure 2 below provides definitions for many of the terms used to explain Electrostatic Spray charging.

9 Review the definitions now. You can refer back to these definitions, as needed, while you proceed through this module or other training on Graco Electrostatic products. Key Terms For Understanding ElectrostaticsCurrentThe flow of in amps, milliamps, or force or pressure pushing in volts or (circular) electrical path that permits the flow of a circuit, a connection to earth potential or true earth through which electrons can easily through which electrons cannot easily flow,and used to control the flow of electrons in electrical circuits. Measured in ohms or , highly resistive material that stops the flow of process by which molecules gain or lose that changes mechanical energy into electrical that changes mechanical energy toalternating SupplyAdevice that converts one type of electricalpower to a different type of electrical power for example.

10 From low voltage AC to high voltage storage or accumulation of electrical charges on a conductive surface that is insulated from other conductive surfaces so that it will hold its electrical within an electrical circuit used to hold electrical percent of coating materials that reaches the targetEfficiencywhen 2 Key terms for electrostaticsBasic Electrostatic Spray Finishing5 Understanding Particle ChargesLearning ObjectivesTo understand Electrostatic Spray charging, you must first be able to identify the types of chargedparticles that make up matter and explain how charged particles impact one another. After com-pleting this section on electrical charges, you will be able to: Name the types of particle charges that make up matter.