Mould Technology 24/06/2021

The ___________ is the part of a mould which provides a space in to which the ejector plate assembly can be fitted and operated.

• Ejector grid

• Bottom plate

• Top plate

• Ejector assembly

The sprue is pulled positively from the sprue bush by ______________.

• Sprue bush

• Blade ejection

• Sprue pullers

• Pin ejection

Polycarbonate (PC) shrinkage %

• 0.4 – 09

• 0.3 – 0.8

• 0.1 – 0.3

• 0.5 – 0.7

For the ejection of certain type of circular bosses on a mouldings ___________ types of ejectors are used.

• Sleeve ejection

• Valve ejection

• Air ejection

• Pin ejection

The ____________ ejection is the most common and simple type of ejection.

• Sleeve ejection

• Valve ejection

• Air ejection

• Pin ejection

After moulding, all plastic materials are caught by core because of ____________.

• Temperature

• Shrinkage

• Additives

• Fillers