Secondary Plastics Processing Techniques — Summer 2025

Discuss the electrostatic spraying technique for powdered plastic coating.

Explain the basic principle for adhesive bonding. List the factors to be considered for good cementing.

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

List the forms of adhesives and explain any two.

Describe the process of Pad Printing.

Explain the Fluidized Bed Coating technique for coating with plastics with a neat diagram.

Explain the Spin or Friction welding technique.

Discuss about molded in and post molded inserts.

Describe the working of a Rotogravure printing technique.

Explain the following i) Corona Discharge technique ii) Flame Treatment technique

Explain the in mold decoration technique for decorating plastics.

Discuss the water transfer process to decorate plastics.

Describe the Hot gas welding technique used for assembly of plastics with a diagram.

Explain briefly the Electroplating technique.

Discuss the principle property considerations for machining of plastics.

Explain the construction and working of Ultrasonic Welding technique used for assembly of plastics with a sketch.1

Describe the Laser Machining technique.

Discuss the purpose of finishing operations and explain Filing and Tumbling operations.

Explain the screen printing process used for decorating plastics with a sketch.

Discuss about Jigs and Fixtures used in machining of plastics.

Explain the High Frequency welding technique and list its applications.

Describe the Hot Stamping process with a neat sketch.

Describe the process of Flocking used for decorating plastics.

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

Describe the Hot Plate Welding technique for assembly of plastics.