A single-color sensor, also known as a single-color cursor locator, is a component used for bag positioning in bag-making machines. It ensures the accurate positioning of bag patterns during the bag-making process. The sensor emits a beam of light, which is projected onto the bag film. The position of the bag is determined based on the reflection of the light beam. Single-color sensors are typically used for making bags with patterns, to ensure consistency in the pattern’s position and to avoid offsetting the pattern due to minor errors during bag making.

Single-color sensors are primarily available in two colors: red and green. Red sensors are suitable for most bag films, while green sensors are used for certain types of special films, such as aluminum foil bags.