Offset printing is when an image needs to be printed it is split up into its CMYK versions. Then papers would be fed through cylinders which have any of the colours from CMYK. The paper is then passed through every colour until the final image is created. Then it is covered in a thin layer of dust to make sure it doesn’t leak on the paper below.
Litho Printing is when the image is burned onto a metal plate using a laser
Bleed- 3-5 mms
Screen printing is a printing technique whereby a mesh is used to transfer ink onto a substrate, except in areas made impermeable to the ink by a blocking stencil. A blade or squeegee is moved across the screen to fill the open mesh apertures with ink, and a reverse stroke then causes the screen to touch the substrate momentarily along a line of contact. This causes the ink to wet the substrate and be pulled out of the mesh apertures as the screen springs back after the blade has passed.
Screen printing is also a stencil method of print making in which a design is imposed on a screen of polyester or other fine mesh, with blank areas coated with an impermeable substance. Ink is forced into the mesh openings by the fill blade or squeegee and by wetting the substrate, transferred onto the printing surface during the squeegee stroke. As the screen rebounds away from the substrate the ink remains on the substrate. It is also known as silk-screen, screen, serigraph, and serigraph printing. One colour is printed at a time, so several screens can be used to produce a multi-coloured image or design.