With a background in the flexo printing and rotary die-cutting inline of corrugated board which stretches back to 1923, BOBST is perfectly placed to understand the requirements and expectations of manufacturers around the globe.
Alongside the development of rotary die-cutting machines that have pushed forward the boundaries of both high graphics printing and die-cutting, BOBST continues to pay close attention to the quality of the finished product and to the productivity and reliability of its equipment.
Rotary die-cutters are used in two main industries, these being the manufacture of corrugated packaging that has high printing and die-cutting requirements, and the production of in-store displays from corrugated board.
BOBST, through its Bobst Lyon product line, has been at the forefront of developing technology to help users exploit these growing markets, including the introduction of independent drives and closed inking circuits. BOBST production lines are designed to deliver accuracy, flexibility, performance, and ease of use, while the wide variety of sizes and levels of automation available suit the needs of a range of users.
Corrugated board is manufactured by combining lining paper with a fluting medium in a unit called a single facer. The liners used may be made from recycled, test, or kraft papers, and will consequently have a brown or white surface, which may be coated or semi-coated, depending on the application they are to be used for. Fluting medium is generally recycled paper.
In the single facer unit, heat, steam, and a corrugating roller are used to corrugate the fluting medium, which then has the liner attached. This creates single face, the basic building block of all corrugated board. Single face is used 'as is' for some specific applications such as litho-lamination, but is normally combined with further liners and fluting media to produce single wall corrugated (single face plus a top liner), double wall (single wall plus single face), or multi-wall (further combinations of the above).
The thickness of the corrugated material will depend on the fluting height created by the single facer and the combination of flutings used. The range of thicknesses can vary from 0,5 mm for the finest, up to 15 mm for the thickest, and sometimes more. The most commonly used grammages are in the range from 80 gsm to 300 gsm, however for some specific applications lighter or heavier papers may be used.