Chapter 2-Injection Moulding Flashcards
What is the purpose of plastic injection moulding?
Injection moulding produces large numbers of parts of high quality very quickly and accurately which makes it very beneficial.
What is the process of injection moulding?
Plastic material formed like granules are melted until they are soft enough to be injected under pressure to fill a mould. This makes an exact copy of the shape.
What happens during the cooling process?
Once the plastic moulding cools sufficiently to harden the injection mould then opens to release the part. The whole process then repeats itself.
What is meant by clamping?
During clamping the moving and fixed platens of the moulding machine hold the tool together when under pressure.
What is the injection process?
The molten plastic that has been melted from pellet form in the barrel of the moulding machine, is then infected under pressure into the mould.
What is meant by dwelling?
After the molten plastic has been injected into the mould, pressure is then applied to ensure cavities are filled. After this the plastic parts are cooled and become solid within the mould.
What happens during the opening and ejection process?
During the opening the moving platen moves away from the fixed platen separating the mould tool.
The rods, a plate or air blast aids the ejection of the complete plastic moulding from the injection mould tool.
