Calculating Crease Matrix Dimensions for Uncoated Folding Cartonboard
Calculate crease matrix width by multiplying uncoated cartonboard caliper by 1.5 and adding rule thickness, setting channel depth equal to board caliper.
Uncoated Cartonboard
Substrate Composition
Raw cellulose fibres constitute the structural foundation of these sheets without the application of external mineral coatings. Uncoated cartonboard relies on the internal sizing of the pulp mass to manage moisture absorption and surface strength. Mechanical refining steps dictate the density and stiffness of the final product.
Production Parameters
Manufacturing processes determine the orientation of fibres through the headbox and wire section of the paper machine. Uncoated cartonboard exhibits a natural surface texture that dictates ink penetration and halftone dot gain characteristics during offset or flexographic printing. Variations in the moisture content of the web alter the curl profile and dimensional stability of the finished stack.
Higher surface roughness values frequently require increased ink film thickness to achieve solid coverage across the board.
Application Threshold
Packaging designers select this material when aesthetic requirements demand a tactile matte finish or when porosity assists in the absorption of specific adhesive types. Uncoated cartonboard performs with consistency in folding applications because the absence of brittle pigment coatings reduces the tendency for surface cracking along score lines. Low levels of friction on the board surface facilitate high speed transfer through automated packing machinery.
Rigid structures utilize the bending stiffness of thick calipers to provide protection for sensitive consumer goods throughout the distribution chain.