shrinkage, Die/Punch, Bend Allowe... (1 of 3) 000:05:29 D Time Spent Q1: 13.16 S

Question

shrinkage, Die/Punch, Bend Allowe... (1 of 3) 000:05:29 D Time Spent Q1: 13.16 SI units) The foreman in the injection-molding department says that a high density polyethylene part produced in one of the operations has greater sh calculations indicate it should have. The important dimension of the part is specified as 120.5 ±0.25 mm. However, the actual molded part measures 120.02 mm. As a first step. the corresponding mold cavity dimension should be checked. Compute the correct value of the mold dimension, given that the shrinkage value for HDPE in Table 13.1 kage than the e for of s ABS terephthalate Nylon-66 Polycarbonate

Explanation / Answer

Sr. No. Material Specified Size %age Shrinkage Shrinkage in linear dimension Correct Dimension of Mould cavity 1 ABS 120.5 0.6 0.723 121.223 2 Cellulose Acetate 120.5 0.5 0.6025 121.1025 3 Nylon-6,6 120.5 0.6 0.723 121.223 4 Polycarbonate 120.5 1.5 1.8075 122.3075 5 Polyethylene, High density 120.5 4 4.82 125.32 6 Polyethylene, Low density 120.5 2 2.41 122.91 7 Polyethylene tetraphlate 120.5 2.3 2.7715 123.2715 8 Ploypropelene 120.5 1.5 1.8075 122.3075 9 Polystyrene 120.5 0.5 0.6025 121.1025 10 Polyvenyle chloride 120.5 0.5 0.6025 121.1025

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