Plastic Mold & Die Design — Summer 2023

Define Injection mould and explain the function of register ring.

Fill in the blanks:

Air vent is used for ii) gate is used for single impression tubular shaped moldings. iii) Runner is a channel connects________ and ______ iv) ejection system is used for ribs in the moulding.

Explain in what condition of product, three plate mould design is recommended. Differentiate between two and three plate mould design.

What is the reason for selecting an air ejection system?

What is the basic difference between dies and mould?

Consider a plain cap design, explain a two plate mould design with suitable sketch.

Calculate runner efficiency for Fully Round (Dia. =D), Half Round (Dia. =D), Hexagonal (Side = a), Rectangular (Side =p & q) and square (Side = G).

Name the different types of split mould actuation methods.

Explain split mould.

Explain sliding splits, guiding & retention of splits.

What are standard mould parts?

What are the methods for split actuation? Name the parts of splits type mould.

Explain the ejection mechanism for the product having internal undercuts in injection mould design with neat sketch.

What are the different methods used in mould for internal thread component molding?

Explain with sketch the side core actuation mechanism for a component having a hole from it’s side.

Explain bubbler cooling mechanism for a long core insert with neat sketch. Is it a balanced cooling system? Justify your answer.

Why the size of the gate is maintained very small?

Write short notes on i) Design Criteria for Injection mould ii) Selection criteria of gate for a particular plastic product.

Explain submarine gate and pin point gate with neat sketch.

What is the function of sprue bush?

What is the function of breaker plate in extrusion die?

Explain sleeve ejection technique with neat sketch.

What is feed system in injection mould ? Explain it’s function.

Explain Fan gate with sketch and compare with Rectangular edge gate.

Explain the dies function used in extrusion process and sketch the die for a pipe extrusion, name it’s parts.