Corrugated cardboard began at the end of the 18th century. At the beginning of the 19th century, because of its light weight and low price, it has a wide range of uses, is easy to make, and can be recycled or even reused, so that its application has grown significantly. By the beginning of the 20th century, it had obtained comprehensive generalization, promotion and application for making packaging for a variety of commodities. Since the packaging container made of corrugated cardboard has unique properties and advantages for beautifying and protecting the interior goods, it has achieved great success in the competition with various packaging materials. It has become one of the main materials for making packaging containers that has been used for a long time and is showing rapid development.
Corrugated cardboard is made by bonding face paper, backing paper, core paper and corrugated paper processed into corrugated corrugated paper. According to the needs of commodity packaging, corrugated board can be processed into single-sided corrugated board, three-layer corrugated board, five-layer, seven-layer, eleven-layer corrugated board. Single-sided corrugated cardboard is generally used as a lining protective layer for commodity packaging or to make lightweight card grids and pads to protect products from shock or impact during storage and transportation. Three-layer and five-layer corrugated cardboard are used in the production of corrugated boxes. Used by the party. Many products are packaged in three-layer or five-layer corrugated cardboard, which is just the opposite and exquisite packaging. Printing beautiful and colorful graphics and pictures on the surface of corrugated boxes or corrugated boxes not only protects the inner products, but also promotes and beautifies Inner goods. At present, many corrugated boxes or corrugated cartons made of three-layer or five-layer corrugated cardboard have been directly put on the sales counter and become sales packaging. The seven-layer or eleven-layer corrugated cardboard is mainly used for making packaging boxes for electromechanical, flue-cured tobacco, furniture, motorcycles, large household appliances, etc. In certain commodities, this corrugated cardboard can be combined to make inner and outer boxes, which is easy to make and convenient for the storage, storage and transportation of commodities. In recent years, according to the needs of environmental protection and the requirements of relevant national policies, the packaging of such corrugated cardboard products has gradually replaced wooden box packaging.
1. Corrugated cardboard
Corrugated cardboard with different corrugated shapes has different functions. Even when using the same quality facial paper and backing paper, due to the difference in the corrugated shape, the performance of the corrugated cardboard is also somewhat different. There are currently four types of corrugated corrugations commonly used internationally. They are A-shaped corrugated, C-shaped fluted, B-shaped fluted and E-shaped fluted. See Table 1 for their technical indicators and requirements. Corrugated paperboard made of A-type corrugated board has better cushioning and has a certain degree of elasticity, and C-shaped corrugated board is second to A-shaped corrugated board. But the stiffness and impact resistance are better than A-type corrugation; B-type corrugated board has a large arrangement density, the surface of the corrugated cardboard made is smooth, and the pressure is high, which is suitable for printing; E-shaped corrugation shows its rigidity because it is thin and dense strength.
2. Corrugated wave shape
The corrugated shape of corrugated corrugated paper constituting corrugated cardboard is divided into V-shape, U-shape and UV-shape.
The characteristics of the V-shaped corrugated waveform are: high plane anti-pressure value, saving the amount of adhesive in use and saving corrugated base paper. However, the corrugated cardboard made of corrugated corrugated paper has poor cushioning properties, and the corrugated cardboard is not easy to recover after being compressed or impacted.
The characteristics of U-shaped corrugated waveform are: large adhesive area, firm bonding, and a certain degree of elasticity. When impacted by external force, it is not as fragile as V-shaped flute, but the plane expansion pressure strength is not as good as V-shaped flute.
According to the performance characteristics of V-shaped flutes and U-shaped flutes, UV-shaped corrugated rolls that combine the advantages of the two have been widely used. The processed corrugated corrugated paper not only maintains the high pressure resistance of V-shaped corrugated paper, but also has the characteristics of high U-shaped corrugated adhesive strength and certain elasticity. At present, the corrugated rolls of corrugated board production lines at home and abroad use this kind of corrugated rolls with UV shape.
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