Taiwan’s Unimicron Technology Corp. said on Thursday that, of its two plants in eastern China’s Kunshan, one would remain closed to comply with COVID-19 lockdowns, but the other factory would resume production. Unimicron, a chip substrate and printed circuit board maker that supplies Apple Inc and Intel Corp, said in a statement one plant had resumed some production under a “closed loop management” system that keeps workers isolated inside. Unimicron plans to keep one plant closed and the other running under the closed-loop system until next Wednesday. Most of Unimicron’s manufacturing capacity is located in Taiwan but it also has...