Our nanofibers evenly radiated by electrospinning conditions are basically attatched which increases dust collection efficiency and improves durability. Our products effectively prevent dust such as fine dust and pollen from entering the room, so you can always open windows and ventilate.

Chang Doctor is a film laser manual product that is applied in the form of a roll screen. There are 3 features that different from other rolling screens.

1. Accelerater(or Decelerator): enables anyone to adjust the speed using a screwdriver easily.

2. Integral button window switch: completely solves the problem of frequent malfunctions due to the complicated structure of non-integral devices that have seperate lock button and release button.

3. One-touch window switch: Just press once to lock or release it.