Plastic Mold & Die Design — Winter 2021

Define: i) Mould; ii) Impression; iii) Register Ring;

Fill in the blanks:

Core and cavity is made out of small steel block, is called as ______ ii) _______ gate is used for single impression tubular shaped moldings. iii) ______ receives the plastic melt from the machine nozzle. iv) ______ ejection is used for thin walled components.

Explain the construction details of Two plate mould with neat figure.

What are the main differences between two plate and three plate mould?

Discuss Integer method and Insert bolster assembly method.

What is ejection system? Explain any two types of ejection.

Draw cooling channels for Integer core & cavity plate.

Name the different types of split mould actuation methods.

Explain split mould.

Explain sliding splits, and guiding & retention of splits.

Name the parts of splits type mould.

Explain angled-lift splits.

Explain Stripping internal undercuts with neat figure.

What are the different methods of thread forming?

What are the alternative designs of moulds for internal threaded components for withdrawing the moulding?

How the Extrusion dies are classified?

Discuss about Sprue pullers.

Define: i) Core; ii) Cavity; iii) Sprue Bush; iv) Guide Pillar;

What is parting line? Explain different types of Parting surface.

What are the different types of Multi daylight mould?

What are the stages involved in Extrusion die design procedure?

Calculate the Volumetric output of extruder & Velocity of melt for the following: Extruder size = 65mm; Extruder output = 60 kg/hr; Outside diameter of pipe = 90mm; Thickness of pipe = 4.5mm; Material = HDPE; Density of Solid = 0.955 g/cc; Density of melt = 0.81 g/cc;

Discuss about the feed system.

Explain Rectangular edge gate and Fan gate.

Calculate runner efficiency for Fully round, Half round, Trapezoidal, Modified trapezoidal, Hexagonal, Rectangular and Square gates.