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In injection moulding process, ribs are generally provided for the reinforcement to avoid sink marks from the component.(a) True(b) FalseI had been asked this question in my homework.I would like to ask this question from Injection Moulding Process topic in portion Moulding with Polymers of Casting-Forming-Welding II

Answer» CORRECT answer is (a) True

The best I can explain: In order to have reinforcement, ribs can be used which mainly avoid the PROBLEM of marks FORMED on the parts. Reinforcing ribs are GENERALLY provided perpendicular to the parting line and made thinner than the MOULD walls. It is always recommended that the thickness of the ribs should lie between 40% and 60% of wall thickness.


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