Secondary Plastics Processing Techniques — Winter 2023

Discuss the importance of surface treatment? List various surface treatment methods for plastics.

Describe the Hot Gas Welding Technique with a neat sketch.

Discuss the Electrostatic Fluidized Bed Coating technique for Powder Coating with plastics.

Explain the corona discharge technique with a neat sketch for surface treatment of plastics.

Discuss the In-mold decoration technique for decorating plastics.

Explain the Hot Foil Stamping Technique for decorating plastics with a neat sketch.

Explain the Induction Welding Technique for assembling of plastics.

List the general rules to be observed for cementing of plastics.

Discuss the purpose of finishing & machining operations and explain the Tumbling process for finishing of plastics.

Describe the construction and working of an Ultrasonic Welding machine with a neat sketch.

Explain the electrostatic spraying technique for powdered plastic coating

Explain the dip method and capillary method for applying solvents for solvent cementing.

Explain the process of Vacuum Metalizing with a neat sketch and list its applications.

Discuss the principal property considerations for machining of plastics.

Explain the process of Flocking.

Describe the pad printing process for decorating plastics.

List and explain different forms of adhesives

Explain the Spin or friction welding technique.

Explain the Gravure printing process for decorating plastics.

Discuss briefly the Water Transfer process.

Explain the Flame treatment technique for surface treatment of plastics

Explain the screen printing technique for decorating plastics.1

Explain the basic principle of adhesive bonding and selection criteria for adhesives,

Discuss about jigs and fixtures used for machining of plastics

Explain the stages of hot plate welding technique with neat sketches.