Boxing Knowledge

Cardboard boxes are widely used packaging products, available in various types such as corrugated boxes and single-layer cardboard boxes, with a range of sizes and models.

Corrugated boxes commonly come in three, five, and less frequently, seven layers. The layers are divided into inside paper, corrugated paper, core paper, and surface paper. The inside and surface papers can be kraft paper or brown paper, the core paper is made of corrugated paper, and the colors and textures of various papers differ. Additionally, the paper produced by different manufacturers varies in color and texture.

Corrugated cardboard is made by bonding together face paper, back paper, fluting paper, and corrugated sheets. Depending on the requirements for product packaging, corrugated cardboard can be processed into single-faced, three-layer, five-layer, seven-layer, eleven-layer, and other types of corrugated boards.

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 can differ due to the differences in the corrugation shape. The internationally recognized corrugation 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 higher density, resulting in a flat surface on the corrugated board, high bearing capacity, and is 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 unit area weight, 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: Generally 100g/m²

Large Machine 105-110 g/m²

Enhanced Core Paper: + Paper 115g/m²