Boxing Knowledge

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

Corrugated boxes commonly come in 3, 5, and less frequently, 7 layers. 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, with the core paper being corrugated. The colors and textures of the various papers differ, as do those produced by different manufacturers (color and texture).

Corrugated cardboard is made by bonding together face paper, back paper, fluting paper, and corrugated paper that has been processed into a wavy fluting. According to 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 various functionalities of the corrugated cardboard. Even with the same quality of face and back papers, the performance of the corrugated board can vary due to the difference in corrugation shapes. Internationally, four standard corrugation shapes are commonly used: 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; C-flute is slightly less than A-flute. However, it has higher rigidity and shock resistance than A-flute. B-flute has a high density, resulting in a flat surface on the corrugated board, high load-bearing capacity, and is suitable for printing. E-flute, due to its thinness and density, exhibits greater rigidity.

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 105-110 g/m²

Enhanced Core Paper: +Paper 115g/m²