Five-layer cardboard is one of the most durable and widely used types of cardboard in the packaging industry. Due to its two flute layers and three flat layers (liner sheet), this type of cardboard is stronger than three-layer cardboard and is ideal for transporting heavy and bulky goods.
Five-layer cardboard is used in various industries such as food, pharmaceutical, industrial and even moving. In addition, due to its high resistance, this cardboard can provide adequate protection for products against impact, moisture and pressure.
In addition to protecting the goods, choosing the right cardboard plays an important role in advertising and branding. Printing on five-layer cardboard allows you to display logos, product information and even custom designs.
In this article, we are going to discuss the structure, types, production line, quality testing, applications and prices of five-layer cardboard so that you can make the best choice for packaging your products.
Five-layer cardboard consists of three flat layers (liners) and two flute layers in the middle.
1. Liner sheet
The liner sheet is the flat, outer layer of the cardboard, whose main function is to protect the product and withstand external pressure. This sheet can be produced from virgin or recycled paper, the higher the quality of the paper, the higher the resistance of the cardboard.
2. Flute Layer
Five-layer cartons have two flute layers sandwiched between three liner layers. The flutes can have different combinations:
Flutes increase the carton’s resistance to pressure, bending, and impact due to their corrugated structure.
3. Method of joining layers
Liner and flute sheets are joined together using glue and heat. The quality of the glue and heat pressure have a direct impact on the strength of the carton.
Advantages of the five-layer structure
Five-layer cardboard comes in different types depending on the combination of flute layers:
| Cardboard Type | Flute Combination | Application |
|---|---|---|
| B + C | B-flute and C-flute | Packaging food and medium industrial goods |
| B + E | B-flute and E-flute | Packaging toys, cosmetics, and lightweight to medium products |
| C + E | C-flute and E-flute | Packaging fruits, medicines, and sensitive products |
B + C: Suitable for bulky products with medium strength
B + E: Suitable for products that require printing
C + E: For packaging sensitive and fragile products
Raw Materials
The raw materials include three liner sheets and two flute layers. The quality of the raw materials directly affects the strength and durability of the cardboard.
Production Steps
Preparation of liner sheets and flutes
Applying adhesive and heating the layers
Compression and drying
Cutting and shaping to the required dimensions
Machinery Used
The main equipment in the five-layer cardboard production line includes the fluting machine, laminating machine, and hot press.
1. Compression test
The carton is placed between two plates and pressure is applied to determine the weight and bending capacity.
2. Water permeability test
The cartons are placed in water for a limited period of time to check the moisture absorption.
3. Layer bonding test
The degree of gluing and bonding of the layers is checked to ensure edge strength.
Five-layer cardboard has a wide range of applications across various industries:
Food and Beverage Industry: Fruits, food packaging, fragile containers
Pharmaceutical and Cosmetics Industry: Packaging sensitive and small products
Industrial Sector: Machinery parts and heavy equipment
Poultry Industry: Packaging eggs
Printing Tips for Five-Layer Cardboard:
E-flute is not suitable for direct offset printing
If printing is required, it is better to print on a separate sheet and then laminate it
The price of a five-ply carton depends on the following factors:
To inquire about pricing, you can contact Nafis Carton experts and receive a free consultation.
Five-ply cardboard combines strength, flexibility and printability. By choosing the right flute type and sheet quality, goods can be protected from impact, moisture and pressure. Using five-ply cardboard not only prevents damage to products, but also enhances the customer experience and your brand reputation.
