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Also known as corrugated cardboard. It is made of at least one layer of corrugated paper and one layer of boxboard (also called boxboard) bonded together, and has good elasticity and extensibility. It is mainly used to make cartons, sandwiches for cartons, and other packaging materials for fragile goods. It mainly uses indigenous straw pulp and waste paper to make raw cardboard similar to yellow cardboard, which is then machined and rolled into a corrugated shape, and then bonded to the boxboard with adhesives such as sodium silicate on its surface.
The corrugated corrugations of corrugated cardboard are like connected arched doors, arranged in a row and supporting each other to form a triangular structure. It has good mechanical strength, can withstand a certain amount of pressure from a plane, and is elastic and has a good buffering effect; it can be made into pads or containers of various shapes and sizes according to needs, which is simpler and faster than plastic buffering materials; it is less affected by temperature, has good light-shielding properties, does not deteriorate under light, and is generally less affected by humidity, but it is not suitable for long-term use in an environment with high humidity, which will affect its strength.
Classification
According to different combinations, corrugated cardboard can be divided into the following five types:
1. Cardboard consisting of a layer of core paper and kraft card is called "exposed corrugated cardboard". Exposed corrugated cardboard is generally only used as a cushion, spacer and wrapping irregular objects.
2. Cardboard consisting of a layer of core paper and two layers of kraft card is called "single corrugated cardboard".
3. Two layers of core paper are sandwiched between three layers of kraft card is called "double corrugated cardboard". Double corrugated cardboard can be composed of corrugated paper with different corrugation widths and different paper qualities, such as "B" corrugated paper with "C" corrugated paper.
4. Three layers of core paper are sandwiched between four layers of kraft card is called "triple corrugated cardboard".
5. Super strong double body cardboard is developed from single corrugated cardboard. Its middle layer of core paper is made of two thick core papers overlapped and glued together.