Coreboard, also known as paperboard or cardboard, is a type of paper-based material that is commonly used to make paper tubes and cores. The production process for coreboard typically involves the following steps:
Pulp production: The first step in making coreboard is to produce the pulp that will be used to create the paperboard. This is typically done by breaking down recycled paper into fibers using a chemical process called pulping. There are two main types of pulping processes: mechanical pulping, which uses grinders to break down the waste, and chemical pulping, which uses chemicals to dissolve the lignin that binds the fibres together.
Papermaking: The pulp is then mixed with water and other additives to create a slurry that is poured onto a moving mesh screen. This forms a flat sheet of fibres that is then pressed to remove the excess water. The sheet is then dried and trimmed to the desired size.
Lamination: To increase the strength and stiffness of the paperboard, multiple sheets of paper are often laminated together. This is typically done by applying a layer of adhesive between the sheets and then pressing them together under heat and pressure.
Calendering: The laminated paperboard is then passed through a series of rollers to smooth and polish the surface. This also helps to make the paperboard more uniform and increases its strength.
Cutting: The paperboard is then cut to the desired size and shape. This can be done using a variety of cutting methods, such as die cutting, rotary cutting, or laser cutting.
Finishing: Finally, the paperboard is treated with a coating or finish to provide additional protection and improve its appearance. This can include a varnish or wax coating, or the addition of a printed design or label.
The production process for coreboard can vary depending on the specific requirements of the final product. However, the above steps provide a general overview of how coreboard is made. The use of high-quality materials and modern manufacturing techniques ensures that coreboard is a strong and reliable material for use in paper tubes and cores.
