Carton Knowledge

Corrugated boxes and single-layer cardboard boxes are widely used packaging materials, available in various sizes and models, depending on the material used.

Corrugated boxes are commonly available in 3-ply, 5-ply, with 7-ply used less frequently. The layers include inner paper, corrugated paper, core paper, and outer paper. The inner and outer papers can be tea board paper or kraft paper, while the core paper is made of corrugated paper. The colors and textures of various papers differ, as do those produced by different manufacturers (color and texture).

Corrugated cardboard is made by bonding face paper, back paper, fluting paper, and corrugated paper that has been processed into a wavy fluting. Depending on the requirements of product packaging, corrugated cardboard can be processed into single-faced, three-layer, five-layer, seven-layer, eleven-layer, and other types of corrugated cardboard.

Different corrugated shapes result in varying functionalities of the corrugated cardboard. Even with the same quality of face and back papers, the performance of the corrugated board differs due to the shape of the corrugation. The internationally recognized corrugated shapes are categorized into four types: A-flute, C-flute, B-flute, and E-flute. Their technical specifications and requirements are listed in Table 1. A-flute corrugated board offers good cushioning and elasticity, with C-flute being slightly less than A-flute. However, it has better rigidity and shock resistance than A-flute. B-flute has a high packing density, producing a flat surface with high compressive strength, suitable for printing. E-flute, due to its thinness and density, exhibits greater stiffness.

Corrugated cardboard material

Board Material Classification: Board materials are categorized by their weight per unit area, and mainly include the following types of board materials:

K Paper: 250g/m²

A Paper: 175g/m²

B Paper: 125g/m²

7 Sheets: 200g/m²

8 Sheets: 260g/m²

C Paper: 127g/m²

Core Paper: Typically 100g/m²

Large Machine 105-110g/m²

Enhanced Core Paper: +115g/m²