Replicated CDs are mass-produced initially using a hydraulic press. Small granules of heated raw polycarbonate plastic are fed into the press. A screw forces the liquefied plastic into the mold cavity. The mold closes with a metal stamper in contact with the disc surface. The plastic is allowed to cool and harden. Once opened, the disc substrate is removed from the mold by a robotic arm, and a 15 mm diameter center hole (called a stacking ring) is created. The time it takes to "stamp" one CD is usually two to three seconds. COUNT 5
QSN1 How are CDs mass produced? ANS1 hydraulic press QSN2 What type of material is used to make CDs? ANS2 raw polycarbonate plastic QSN3 What size is the diameter of the center hole in a CD? ANS3 15 mm QSN4 How long does it take to stamp out one CD? ANS4 two to three seconds QSN5 What is the term for the center hole in a CD? ANS5 stacking ring