Substrate Specification
Recycled paperboard packaging often utilizes multi-ply structures designed to combine cost efficiency with high printability. In this context, GT2 triplex board represents a specific grade featuring a double-coated white top layer, a recycled middle layer, and a grey or wood-colored reverse side. This material is primarily used for folding cartons where high brightness on the reverse side is not required.
Structural Makeup
The multi-ply composition of the sheet is engineered to optimize both stiffness and print performance across high-speed runs. The top layer consists of bleached chemical pulp or high-quality recycled wood fibers, which are heavily coated to create a smooth surface for offset lithography. Underneath, the middle and bottom plies contain mixed recycled paper and board, providing the bulk needed for the carton.
This layered assembly minimizes costs while ensuring the board remains flat during printing and converting.
Ply Performance
Ply bond strength in the recycled core affects how the board responds to creasing and scoring. Because GT2 triplex board has a high proportion of secondary fibers, its ply bond strength is lower than that of virgin fiber boards. This makes the material easier to crease without rupture, though care must be taken to prevent delamination along the edges.
The converted carton must retain its shape when erected on automated filling lines.
