1. Coated unbleached kraft paper (CUK)
This type of kraft paper is considered the most basic version, without adding any "bleaching" or chemical substances, only retaining the original craftsmanship of kraft paper. Therefore, it is also known as solid unbleached sulfate, mainly composed of 80% virgin fiber wood pulp/cellulose kraft pulp. This type of paper not only has excellent tear resistance and high rigidity, but also has a moderate thickness. Compared to other kraft paper packaging substrates, it is lighter and thinner.
2. Solid bleached kraft paper (SBS)
Although unbleached kraft paper is favored by environmentalists for its natural color and chemical free treatment, it may not always be the ideal choice in certain occasions, such as packaging for luxury goods or high-end products. In these applications that require better appearance and printing quality, solid bleached kraft paper (SBS) often stands out. Its smooth surface and bright color not only enhance the printing effect, but also give the product packaging a more outstanding appearance texture.
3. Coated Recycled Board (CRB)
Coated recycled board is a material made entirely of recycled kraft paper. Although its specifications/tolerances are slightly smaller compared to solid bleached kraft paper, the utilization of recycled kraft paper is not only cost-effective, but also suitable for occasions that do not require high tear resistance/strength, such as packaging for cereal boxes. In addition, by adding a layer of kraft paper to the corrugated cardboard box, it can further enrich its type selection.
