With the trend of sustainable development and the increasing demand for environmentally friendly packaging, investing in an automatic production line not only helps businesses increase productivity, reduce labor costs but also ensures consistent quality for each product. In this article, Intech Group will help you learn in detail about the structure, operating principles and benefits of applying a carton production line in modern industrial production.

Standard carton production line structure

A modern carton production line is made up of many specialized parts, operating continuously to ensure high efficiency and stable quality for the output product. The structure of the above line includes:

• Paper roll holder: This part is responsible for lifting and fixing the raw paper roll, ensuring continuous paper supply for the entire system.

• Surface paper drying oven & corrugated paper dryer: Has the role of drying the surface paper and corrugated paper layers, helping the paper achieve the necessary strength and hardness for the corrugated and gluing process.

• Automatic paper splicing machine: Helps to connect paper rolls together to ensure the production process is not interrupted.

• Single-sided corrugated machine: Is an important device that creates the characteristic corrugated layer of carton, combined with the surface paper to form the carton sheet.

• Transport bridge & multi-layer dryer: Moves and dries the paper after corrugation through many layers of temperature to ensure dryness, flatness and firmness.

• Gluing machine, drying rack, size cutting machine, sheet cutting: The finishing stage helps shape the product, glue the paper layers and cut them into required sizes.

• Automatic paper feeding and stacking machine: Automatically feeds the paper and stacks it neatly, ready for the packaging stage.

• Automatic control and soy production system: Ensures accurate mixing of adhesive materials and controls the entire line to operate smoothly and efficiently.

Operation process of carton production line

To ensure high automation, a modern carton production line usually goes through the following 7 main steps:

Step 1: Adjusting humidity and paper tension

In the first step, the base paper rolls will be mounted on the lifting shaft, then the paper will be passed through the heat drying system to adjust the humidity and tension accordingly. This is an important step to ensure that the paper does not wrinkle or tear in the next steps.

Step 2: Corrugated and glued

Next, the paper is passed through a single-sided corrugated machine to create corrugated lines, then coated with a specialized glue to bond the paper layers. This stage helps to form the characteristic corrugated layer of the carton.

Step 3: Heating and gluing

The glued paper layers are pulled through the heat drying system and gluing machine, from here the corrugated layer will be pressed to the top and bottom paper layers, forming a three-layer or five-layer carton board depending on the requirements.

Step 4: Carton Forming

The forming machine performs the process of bonding, gluing and shaping the complete carton boards. This stage ensures the firmness, durability and correct size of the product.

Step 5: Cutting across to size

The shaped carton board will be transferred to the size cutting machine to cut precisely according to the programmed size. High precision helps reduce loss and increase production efficiency.

Step 6: Quality Control

The product will go through an automatic camera inspection system to assess the thickness of the glue layer and the accuracy of the gluing. Unqualified boards will be immediately eliminated.

Step 7: Counting and stacking automatically

The machine will automatically count the number of finished cartons and stack them in batches, ready to move to the packaging or shipping stage.

Types of machinery used in carton production lines

Depending on production requirements, businesses can choose 3, 5 or 7-layer corrugated lines with popular paper sizes ranging from 1400mm to 2500mm, along with standard wave forms such as A, B, C, E. A carton production line usually has the following types of machines:

1. Automatic vertical Flexo printing machine

This is the main printing equipment in carton production workshops. The machine has the ability to flexibly adjust the number of colors, supports fast and accurate printing, suitable for many types of carton boxes with diverse printing designs.

2. Automatic 4-color horizontal Flexo printing machine

As an improved version with high speed, the horizontal Flexo printing machine not only supports 4-color printing but also integrates corner cutting, lamination and round die cutting functions. This helps businesses shorten production time and reduce the number of intermediate stages.

3. High-speed round die-cutting machine

This device is specialized in forming carton boxes according to pre-set molds. With a capacity of 80-140 sheets/minute, the round die-cutting machine is ideal for large orders that require high speed and absolute precision.

4. Laser engraving machine

Using high technology, the laser engraving machine helps create sophisticated prints with outstanding detail, while optimizing the time to prepare the printing mold for new designs.

5. Paper laminating machine (offset laminating machine on carton)

The laminating machine is a device that supports the addition of an offset printing layer to the outside of the carton, to increase the aesthetics and commercial value of the product. This is an ideal solution for high-end packaging or requiring eye-catching images.

6. Conveyor belt

Conveyor belts are extremely important equipment in manufacturing plants that help transport products between working stages. Using conveyor belts and conveyor belts also helps save costs, labor, and operate the system stably and safely to avoid waste.

7. Creasing and dividing machine

The creasing and dividing machine is a modern device that can adjust the knife and crease specifications completely automatically by computer, in less than 1 minute. Thanks to the integration of intelligent control technology, the machine can automatically synchronize the speed with the entire carton production line, ensuring stable and accurate productivity.

8. Automatic carton gluing machine

This is a simple but indispensable device in the carton production line. The automatic carton gluing machine completely replaces the traditional manual gluing method, not only increasing productivity but also ensuring the quality of the gluing is even and firm. With the ability to operate easily and maintain quickly, the machine is suitable for all production scales and is especially useful in meeting diverse and complex packaging requirements from customers.

9. Carton Stapler

The stapler uses compressed air and a specialized U-shaped needle to help firmly fix the edges of the carton quickly and accurately. This device is very flexible, can be applied to many different types of carton paper, meeting both regular products and special orders.

Address providing conveyor belts for the current quality carton paper production industry

To have a modern and professional carton paper production process, it is indispensable to have the above modern supporting equipment and machinery. Therefore, to ensure that the finished product is a high-quality, aesthetically pleasing carton box, choosing a facility that provides machinery in the packaging industry is very important.

Currently, INTECH is one of the most prestigious units specializing in providing automation solutions in the production line. At Intech, you will choose a PLC-controlled conveyor system, pallet conveyor, roller conveyor. In addition, we also provide self-propelled robots and loading robots to help transport goods to locations accurately. The machines manufactured and distributed by Intech Group are all strictly quality tested, and the technical team always provides quick support. Contact Intech immediately to ensure your paper box and carton production process achieves high productivity and the best quality.