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Unit 142 Plastic Dustbins

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Unit 142: Plastic Processing
Assignment 1: Moulding techniques used for the manufacture of plastic products

P1 & P2

Plastic Dustbins
The moulding technique used to make plastic dustbins is referred to as injection moulding.
Injection moulding is the process where plastic is injected into a mould to form the final product.

Both thermoplastics and thermosetting plastic can be used for the process of injection moulding. For this type of product HDPE is used, which is a thermoplastic.
The material, usually in the form of pellets or granules, is dropped into the hopper. Heaters are found around the rotating screw; here the plastic is melted to a viscous state.
Next, the plastic is injected into the mould and pressure build-up packs and holds the material in place.
Cooling …show more content…
Flow efficiency increases as the cross-section resembles a circle.

Hot Runner System
If properly designed, these can eliminate sprue regrind, reduce cycle times and improve the process. The runner system may vary due to part design, material and size of part.
The mould should be designed so that heat escapes as fast as possible from the gate. Sticking may occur if gate does not cool properly. Steel that is heated because of hot drop should not touch the part directly; instead it should be insulated from the part that is cool.

Vents and Ejectors
Vents allow air and other gasses to escape the mould. Burning and short shots may occur if the parts are not properly vented. Improper location of vents may also cause these defects, and can be solved by relocating the gates.
It is important to place ejector pins where necessary as it may cause part distortion. When the mould part is polished, it is easier to eject. However an over polished mould may result in vacuum being drawn when the part is being ejected.

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