Unit 1 Introduction

4 lecture hours

• Classification of extruder machines
• Principle of working of Single and Twin Screw
• Basic Terminologies of extruder
• Drag flow
• Pressure flow
• Leak flow

Unit 2 Constructional features of screw Extruder

10 lecture hours

• Extruder Screws Barrel and feed throat Feed Hopper Grooved Barrel Technology Heating & Cooling systems
• Thrust bearing assembly Die assembly: Breaker plate
• screen and screen changers Extruder drives Devolatilization in screw extruder Material Selection Criteria Melting Mechanism

Unit 3 Twin screw extruder

5 lecture hours

• Twin vs. single screw extruder Intermeshing (Co-rotating and counter-rotating) and non intermeshing twin screw extruders

Unit 4 Screw design for extruder

• Standard extruder screw and modification of the standard extruder screw
• Vented extruder screw designs

Unit 5 Subject Code

11 lecture hours

• AY 2018-19 Multi-flighted extruder screw Mixing screws 5 Extrudion lines: Pipe and tube Wire coating and Cable coating Sheet and film (Tubular and Flat) Monofilaments Profile extrusion Palletizing Coating Co extrusion

Unit 6 Dies for extruder

5 lecture hours

• Typical extrusion dies-Straight through
• cross head dies and offset dies
• Wire covering cross head die Dies for tubular film
• Flat film dies Sheet dies Pipe and Tube dies Dies for solid sections Coextrusion dies

Unit 7 Trouble shooting extruders

2 lecture hours

• its causes and remedies