Premium Substrate
Virgin fibre grades provide a high degree of brightness and strength for high-end packaging applications. The solid bleached sulfate board consists of pure chemical pulp that has been treated with chemicals to remove the lignin that causes paper to turn yellow. This material is the highest quality of paperboard available for the folding carton industry.
Chemical Composition
Manufacturing starts with hardwood or softwood fibres that are cooked in a sulfate process to separate the cellulose from the wood glue. Because the solid bleached sulfate board is made entirely from white bleached fibres, it is clean and safe for direct contact with food or medicine. The board often features a clay coating on one or both sides to provide a smooth surface for high-resolution printing.
This smoothness ensures that ink sits on the surface rather than soaking in, which results in vibrant colors and sharp text. The internal strength of the virgin fibres allows the board to be embossed or foiled without cracking. It provides a superior surface for the application of complex varnishes and laminates.
Printing Performance
Consistency in thickness and stiffness makes this grade the preferred choice for cosmetic and pharmaceutical boxes. While solid bleached sulfate board is more expensive than recycled grades, it offers a luxury feel that many brands require. The finished package remains strong and bright throughout its shelf life.