Thermoformed large wrapping paper, also known as thermoformed calcium carbonate cardboard, is mainly composed of calcium carbonate.

In the production process of stone board, calcium carbonate is mainly used as the main raw material. The entire production process does not need to add a drop of water or consume wood, which saves precious water resources and forest resources.

Using stone to make products, the current technical problem to be solved is how to provide a low-cost, high-performance stone cardboard. In order to solve this technical problem, the technical solution adopted is to produce a three-layer composite structure of stone cardboard, including an upper surface layer, a lower layer and an intermediate layer. The so-called upper surface layer, lower surface layer and middle layer are all large wrapping paper layers.

The thickness of the above-mentioned stone cardboard is 0.3 to 2.5 mm, and the thickness ratio of the surface layer to the intermediate layer is 1: 2.5 to 1: 4.5. The upper and lower layers are stone paper layers with low stone powder content, and the middle layer is stone paper layers with high stone powder content.

Folders / file boxes currently on the market, including their skins, are also made of stone cardboard. This new type of stone cardboard has a three-layer composite structure, with an upper surface layer, a lower surface layer and an intermediate layer of the stone cardboard. Each layer can use stone paper layers with different stone powder content, and the middle layer can use stone paper layers with high stone powder content to reduce the cost of cardboard; the upper and lower layers can use stone paper layers with medium or low stone powder content. In order to improve the strength, toughness and surface finish of the product, the three-layer composite structure of stone cardboard can realize the unification of high performance and low cost of the product.

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