A curtain machine factory is a production plant that specializes in the manufacture of many different types of machines used in curtain production. These factories make use of precise machining and assembly line techniques to create precision components like CNC cutting tables, ultrasonic welders, and multi-needle sewing machines which are complete machines by themselves. They commonly practice lean manufacturing to optimize efficiency and control quality, having in-house testing facilities that verify each machine operates as intended. Some factories also do OEM work where clients can brand the machines with their own logos.