Boxing Knowledge

Corrugated boxes are widely used packaging materials, which come in various types depending on the material, such as corrugated boxes and single-layer cardboard boxes, available in different sizes and models.

Commonly used cardboard boxes have three, five, or rarely seven layers. The layers are divided into inner paper, fluted paper, core paper, and face paper. The inner and face papers can be kraft paper or brown paper, while the core paper is made of fluted paper. The colors and textures of different types of paper vary, 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. 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.

Corrugated cardboard made from different wavy shapes has varying functionalities. Even with the same quality of face and back papers, the performance of the corrugated board differs due to the shape of the flutes. The internationally recognized flute shapes are divided 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 impact resistance than A-flute. B-flute has a high packing density, resulting in a flat surface on the corrugated board, high compressive strength, and is suitable for printing. E-flute, due to its thinness and density, exhibits greater stiffness and strength.

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