Low-temperature Modification of Discarded Printed Circuit Board

摘要

Introduce cryogenic grinding and the components of Printed Circuit Board (PCB). Study the low-temperature modification of PCB, including mechanical property to find the influence of the different low-temperature on impact strength, flexural strength, shear strength of PCB. Tests show that impact strength and shear strength of PCB change sharply at - 30°C. Used ZKB-2 type double roll shear crusher to crush PCB to 20mm × 20mm particle size, in a temperature range of -30°C～ - 10°C, the product yield is 17% higher than room temperature, and much lower temperature may deteriorate the product quality of crusher. Used R type mill to grind sample to minus 3mm under different working condition, the average power is decrease in evidence at - 30°C, freezing time for 5 minutes is best.