Liquid packaging body paper board and preparation method thereof

Abstract

The invention provides a liquid packaging body paper board and a preparation method thereof. The liquid packaging body paper board consists of a backing paper layer, a core paper layer, a surface paper layer and a coating layer which are stacked in sequence, wherein the backing paper layer is prepared from the following raw materials in percentage by weight: 80-100 percent of unbleached sulfate pulp and 0-20 percent of non-dried chemical broad-leaf fresh pulp; the core paper layer is prepared from the following raw materials in percentage by weight: 10-20 percent of non-dried chemical broad-leaf fresh pulp, 50-80 percent of unbleached sulfate pulp and 5-30 percent of mechanical pulp; the surface paper layer is prepared from the following raw materials in percentage by weight: 20-80 percent of non-dried chemical broad-leaf fresh pulp and 20-80 percent of chemical needle-leaf pulp. Compared with the prior art, the liquid packaging body paper board has the advantages that the non-dried chemical broad-leaf fresh pulp is added into paper pulp of the backing paper layer, the core paper layer and the surface paper layer, and due to the specific high intensity and high stiffness as well as the high fiber bonding strength of the non-dried fresh pulp, the stiffness and the intensity of the liquid packaging body paper board are improved under a condition that the amount is fixed and is not increased; the liquid packaging body paper board has less-damage performance.

Description

technical field [0001] The invention belongs to the technical field of flexible packaging paper, and in particular relates to a liquid packaging raw cardboard and a preparation method thereof. Background technique [0002] With the progress of society, the continuous improvement of people's living standards, the continuous updating of the consumption concept of the masses, and the massive environmental protection movement on a global scale, the demand for flexible packaging with less materials, low waste, and easy recycling is increasing. , The development of the flexible packaging industry will inevitably demand more packaging raw cardboard. At present, most of my country's liquid packaging raw cardboard still relies on imports. Therefore, further research and exploration of the production of liquid packaging raw cardboard will enable my country to produce its own liquid packaging raw cardboard. It is an important issue faced by the domestic paper industry. [0003] The liqu...

AI Technical Summary

Problems solved by technology

[0006] Since the pulp of the original paperboard of the existing packaging materials is mostly composed of dried chemical-mechanical wood pulp and bleached chemical wood pulp, and the fiber bonding strength after drying is not good, in order to maintain the stiffness and strength of the original paperboard, the original The basis weight of cardboard is often high, and the environmental protection pressure of fibers is also relatively high. This invention considers to provide a liquid packaging base cardboard with higher stiffness and higher strength under the same basis weight.

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