Cardboard is a heavy paper-based material made from cellulose fibers. These fibers can be extracted as wood pulp from softwood trees like pine, fir, and spruce, recycled paper, or a blend of both. Those fibers are mixed with water, formed into sheets, dried, and pressed. Based on how the sheets are layered and attached, the result is paperboard (a single thick sheet, like a cereal box) or corrugated fiberboard (two flat liners with a wavy fluted layer glued between them, like a shipping box).
The word cardboard does have nuances when it comes to a proper definition. Packaging engineers and standards bodies almost never use it. They use specific terms like paperboard, corrugated fiberboard, chipboard, or solid bleached sulfate. When someone says “cardboard,” they usually mean one of three things (Here is a whole site about cardboard : https://thepremierpackaging.com/everything-you-need-to-know-about-cardboard/?srsltid=AfmBOorh5vrkGQ0f6HueIEIj4JafS9tUEw-Lky0uo_D12AS-523hDCwk)
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The word cardboard does have nuances when it comes to a proper definition. Packaging engineers and standards bodies almost never use it. They use specific terms like paperboard, corrugated fiberboard, chipboard, or solid bleached sulfate. When someone says “cardboard,” they usually mean one of three things
(Here is a whole site about cardboard :
https://thepremierpackaging.com/everything-you-need-to-know-about-cardboard/?srsltid=AfmBOorh5vrkGQ0f6HueIEIj4JafS9tUEw-Lky0uo_D12AS-523hDCwk)