1) Actually, traditional bag drawing often uses heat transfer or screen printing.
Heat transfer printing prints the pattern design on the thermally stable gummed paper, through heating and compression, transfer the images onto the products.
Screening printing is a printing technique that uses a woven mesh to support an ink-blocking stencil. The attached stencil forms open areas of mesh that transfer ink as a sharp-edged image onto a substrate. A roller or squeegee is moved across the screen stencil, forcing or pumping ink past the threads of the woven mesh in the open areas.
2) But our printer uses digital printing method.
Digital printing is the reproduction of digital images on a physical surface. It is generally used for short print runs, and for the customization of print media.