10 kinds of characteristics of corrugated cardboard and problems prone to the production process

Corrugated cardboard packaging containers are functionally superior to the 10 features of other types of packaging:

The plasticity of the modeling structure can be arbitrarily cut, punched, folded, etc.; the convenience of the packaging is easy to use - it is light in use, flexible in structure, and flexible in texture; it can be both rigid and flexible - it can be used as a packaging and external force. Ideal protective mediators; beautifying the promotional nature of goods - able to produce a variety of variegated structures and beautiful decoration printing; the suitability of the flow effect - can use different quantitative, different grades of raw paper to produce different sizes of containers Low cost of packaging—primary material is base paper; use of resource availability—Compared with traditional wood products, the wood consumption of corrugated paperboard base paper only accounts for 30% of wood product packaging; easy to recycle—the basic raw material is The base paper can be easily recycled after use, and the recycling and recycling rate can reach 75%. The superior green environment--after use, the corrugated board can be burned, non-toxic, degraded quickly and will not cause pollution to the environment; - Due to the foldable lightweight hardware package, it is possible to make efficient use of the positions and transport loading space.

Problems and Solutions of Products in Corrugated Cardboard Production Process

Cardboard warping

In general, there are six phenomena of warpage in corrugated cardboard. The most common ones are:

Warping

The reason for this is: the moisture content of the raw paper is too high (or the moisture content of the paper is low); the single-sided corrugated paper has too much moisture, and the quantitative grades of the paper and paper are too different.

The solution: (1) increase the surface area of ​​the paper in the single cylinder dryer; (2) reduce the paper in the double layer preheater winding surface; (3) close part of the flat dryer steam valve; ( 4) Increase the running speed of the compound machine; (5) Reduce the clearance between the scraper roller, the squeegee roller and the lower corrugating roller, and reduce the sizing amount of the single-faced corrugated roller; (6) Replace the liner paper that exceeds the moisture requirement.

2. Lateral warpage

The reason is: the moisture content of the base paper is too high; the temperature and speed of the heated area are not normal.

Solution: (1) increase the surface of the paper in the double-layer preheater heating surface; (2) the use of a better adhesive viscosity, reduce the amount of gluing machine; (3) reduce the single-sided machine paper (4) Reduce the production speed at the compounding machine; (5) Correctly adjust the line speed of the production line and the flat-plate dryer steam valve to match; (6) Replace the face paper that exceeds the moisture requirement severely.

Cardboard False Bonding

The so-called paperboard false bonding refers to a phenomenon that the paperboard can be stripped off from the back of the paper, paper and corrugated paper.

The main causes are: (1) the adhesive has insufficient viscosity or has deteriorated; (2) the speed of the corrugator or laminating machine is too fast; (3) the pressure of the corrugator is uneven or the corrugating roller is worn; (4) compounding Spreader rubber roller gap is too large; (5) paper moisture content is too high. Solution: (1) Improve and stabilize the adhesive quality. Relevant data suggest that the adhesive viscosity is generally 60S to 90S in winter and 90S to 120S in summer. The seven-layer box is generally about 305 times slower than the three-layer box; (2) It ensures that the steam pressure is 1.0MPa to 1.2MPa, and the temperature of each roller body and plate dryer is about 160°C; (3) The output of homemade corrugated roller is up to 3 million. When one meter is 3.5 million meters long, it must be replaced in time.

See-saw phenomenon

The so-called see-saw phenomenon refers to the corrugated paperboard after being made. On the surface of the surface paper, there is a concave phenomenon between the back of the peak and the back of the peak, and the shape is the same as that of a domestic washboard. It is called a see-saw phenomenon.

The root cause of the seesaw phenomenon in corrugated board is mainly attributed to improper adhesive sizing, which is caused by the excess glue that collects on both sides of the peak. This situation is particularly detrimental to the low-quantity linerboard.

The specific methods of controlling the board seepage are: to adjust the amount of face paper, and to use a higher amount of linerboard is the most direct and effective way to eliminate and reduce the board shape (but it will increase the cost); the use of high quality adhesives can reduce The peak sizing amount; control the surface of the heating paper on the pre-heater, because the board paper is too dry, the glue intake is more, it is easy to produce the seesaw phenomenon; adjust the composite glue machine sizing roller and paper The degree of parallelism of the guide rollers and the gap between them, the degree of pressure of the guide roller (pressure roller) is strictly controlled to prevent the increase of the amount of glue after collapse.