High-strength corrugated paper manufacturing process
High-strength corrugated paper is a sheet-like packaging material made by bonding linerboard and corrugated paper pressed by corrugating rollers.
It is structurally divided into single-layer and double-layer types, and includes five corrugated sizes: A, B, C, E, and F. It features high elasticity and outstanding compressive strength.
Finished products must meet quality standards of smooth surface and uniform thickness. Its basis weight ranges from 80 to 270 g/m².
It is manufactured into cartons through die-cutting, gluing, and other processes, and is widely used in packaging for food, cosmetics, and handicrafts.
A single layer of high-strength corrugated paper has a load-bearing capacity of over 12 kg. The core technology enhances structural strength through corrugation forming.
Modern production processes combine composite layer structural design with environmentally friendly materials (such as waste corrugated paper and crop straw),
employing techniques such as sizing and flame retardants to further enhance waterproofing and mechanical properties.
Performance Characteristics
High-strength corrugated paper is characterized by its high elasticity and outstanding compression resistance.
Through structural design (such as U-shaped or V-shaped corrugated cores, outer pressure-bearing layers, and inner cushioning layers),
high-strength corrugated paperboard improves its compression resistance and cushioning performance, increasing the safety of electronic components during transportation.
The surface of high-strength corrugated paperboard is flat and of uniform thickness.
High-strength corrugated paperboard is then processed into high-strength corrugated boxes through die-cutting, gluing, and other processes.
Types
By Shape: Paper Type: Available in colored, rainbow, metallic E-flute, printed, B-flute, E-flute, F-flute, S-flute colored paper, and H-flute; available in sheets and rolls.
By Grammage: 80g/100g/120g/140g/170g/200g/230g/270g. Some products have a grammage range from 45g/m² to 170g/m².
Uses: Widely used, primarily for paper bags, school supplies, various craft gift boxes, and product packaging gift boxes.
Structural Design
High-strength corrugated cardboard structure comprises a corrugated base layer, an outer pressure-bearing layer, and an inner cushioning layer.
The corrugated base layer consists of an upper boxboard, a lower boxboard, and a U-shaped or V-shaped corrugated core in between.
The outer pressure-bearing layer, located on the upper surface of the corrugated base layer, consists of an outer waterproof cardboard and its underlying triangular corrugated tubes.
The inner cushioning layer, located on the lower surface of the corrugated base layer, consists of an inner waterproof cardboard and its uppermost circular corrugated tubes.
This composite layered structure, through the combination of materials and optimization of the corrugated shape, aims to improve the compression and cushioning performance of the corrugated cardboard.
Quality and Testing
GB/T 6545-1998 “Determination of Bursting Strength of Corrugated Board” is a national standard. T/CASME 1704-2024 “Environmentally Friendly High-Strength Corrugated Board” is an industry standard.
Summarize
Packaging containers made of high-strength corrugated cardboard have unique properties and advantages in beautifying and protecting the contents, and have achieved great success in competition with various packaging materials.
They are one of the main materials for making packaging containers.
Through continuous technological improvement, a new structure was proposed in a utility model patent in 2020 to improve the compression and cushioning performance.