Plastic Processing Technology
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Plastic Processing Technology Syllabus — Unit-wise Content
The official GTU curriculum for Plastic Processing Technology (subject code 3712411) as prescribed for PE · Semester 1 divides the course into 6 units, covering 23 listed topics. The unit-wise breakdown below is read from the GTU syllabus document for this subject code, so you can check what the course actually covers before deciding which papers to attempt.
Download the official syllabus PDF (3712411)Unit 1 Introduction to Plastics Processing
- How does processing happen
- rheology aspects
Unit 2 Injection Moulding
- Basic principles – Classification of processing methods – Effect of polymer properties on processing behaviour.Injection Moulding – Definition of terms – Specification – Types of machines used – Parts of machine & their functions – Cycle time – Process variables & its effect on Moulding quality – Cavity pressure profile – Factor influencing moulding shrinkage
- annealing – Frozen-in – Stresses – Types of clamping systems and their merits & demerits – Start up and shut down procedures – Processing parameters and special precaution to be taken while processing of Engineering plastics such as Nylon
- Acetal, PC, etc.
- - Common moulding defects
- causes and remedies
Unit 3 Compression Moulding
- Introduction – principles – definition of Terms – Compression moulding process – specifications – machine used – Bulk factor – flow – cure relationship – ageing of compound – cup flow 5and spiral flow tests & its significance – cycle time - Preforming
- preheating – Methods
- machine used
- merits & demerits - Influence of process variables such as temperature
- part size & configuration on quality and cycle time - Compression moulding of Thermoplastics – cold forming – sintering - Optimising process parameters & Trouble shooting - Merits & Demerits of Compression moulding - Finishing operation
Unit 4 Transfer Moulding & Thermoset Injection Moulding
- Transfer Moulding - Principles – Types of process – machine used – pot transfer
- plunger transfer & screw transfer moulding techniques – moulding cycle – specification – merits and demerits of transfer moulding – Theoretical calculation of pressures – line pressure
- Injection ram pressure – trouble shooting.Difference between transfer moulding and Thermoset Injection Moulding
Unit 5 Extrusion
- Introduction – principles – classification of extruders – single screw extruder – specification – screw nomenclature – types of screws – L/D ratio
- compression ratio- back pressure – factors governing back pressure – output and factors affecting output- heating & cooling systems – breaker plate – screen pack & its functions – screw & hopper cooling-die entry effects and die exit instabilities – shark skin
- melt fracture & bambooing
- Twin screw extruder – principle – types – process – merits & demerits – Vented barrel extruder – hopper loading devices - Drying equipments Process
- machinery – down stream equipments – dies for producing products such as – film – blow film
- cast film – Sheets - Tubes / pipes
- corrugated pipes – Mono filaments - Box strapping- Coating Lamination
Unit 6 Blow Moulding
- Introduction – Principle – Processes – Extrusion Blow Moulding – Injection Blow Moulding – Process control – Parison programming – Moulds – Machine used – Constructional features – Material and design factors affecting bottle performance – Trouble shooting – Stretch Blow moulding – Process outline
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