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Industrial paper refers to specialized paper and paperboard grades engineered for packaging and structural applications-such as corrugated boxes, folding cartons, cups, plates, and industrial wrapping-requiring enhanced mechanical strength, dimensional stability, printability, or functional performance beyond that of standard printing or writing papers. Key categories include kraft linerboard, corrugated medium, wrapping papers, coated white board, uncoated white board, grey chipboard, and bituminous roofing base paper.
I. Linerboard
Linerboard is a high-strength, non-woven (i.e., non-walleyed) paper grade specifically designed for the outer and inner facings of corrugated board. Its top layer is typically composed of unbleached sulfate (kraft) pulp to ensure superior tensile and burst strength, while the core and back layers may incorporate recycled fiber blends to optimize cost and sustainability without compromising structural integrity. For instance, linerboard manufactured at our facility exhibits exceptional breaking strength, ring crush resistance, surface smoothness, and lithographic print adaptability-attributes validated through standardized TAPPI testing protocols.
II. Corrugated Medium
Corrugated medium is a semi-chemical pulp-based paper engineered to form the fluted (corrugated) layer in corrugated board assemblies. It balances stiffness, compressibility, and glue adhesion to ensure optimal flute formation and bonding performance. Our Da Yuan and Houlie manufacturing facilities produce medium grades meeting stringent industry specifications, demonstrating consistently high ring crush strength (RCT), uniform sheet formation, and excellent adhesive affinity across diverse starch-based bonding systems.
III. Wrapping Papers
Wrapping papers encompass a functional category of industrial papers used for protective and containment packaging. Representative grades include cement sack paper (high-tensile, moisture-resistant kraft), asphalt-saturated sandwich paper, aluminum foil backing paper (for thermal and vapor barrier applications), and multi-ply bag kraft. These grades are selected based on end-use requirements such as tear resistance, porosity control, barrier compatibility, and processability on high-speed packaging lines.
IV. Coated White Board
Coated white board is a three-ply paperboard comprising bleached chemical pulp surfaces (front and back) and a core layer of recycled or blended pulp. Both surfaces undergo coating-typically with calcium carbonate–based formulations-to enhance whiteness, gloss, smoothness, and ink receptivity. Our Luoji facility produces single-coated white board meeting international standards for folding carton applications, characterized by high brightness (>92% ISO), calibrated gloss (60°), robust interlayer bond strength, and superior crease and fold endurance under dynamic packaging conditions.
V. Uncoated White Board
Uncoated white board is a three-ply board constructed entirely from bleached chemical pulp on both faces and recycled fiber in the core, without surface coating. It offers balanced stiffness, opacity, and printability for applications where matte finish, recyclability, or cost-efficiency are prioritized over high-gloss aesthetics.
VI. Grey Chipboard
Grey chipboard (also known as solid bleached board substitute or SBBS alternative) is a low-cost, high-recycled-content board produced predominantly from deinked waste paper via Fourdrinier forming. It features a homogeneous grey appearance, moderate stiffness, and adequate folding performance for secondary packaging and display substrates. Our Hsinchu facility manufactures grey chipboard conforming to EN 643 and ISO 186 specifications for consistency and fiber cleanliness.
VII. Bituminous Roofing Base Paper
Bituminous roofing base paper serves as the fibrous substrate for asphalt-saturated or laminated roofing felts. It is manufactured from a blend of recycled wood pulp, cotton linters, and wool fibers to achieve a deliberately open, porous, and flexible structure-while retaining sufficient wet and dry tensile strength to withstand impregnation, coating, and roll-forming processes. Performance criteria include controlled absorbency, dimensional stability under thermal stress, and compatibility with oxidized or polymer-modified bitumen systems.
