A kind of primary wood pulp cardboard and preparation method thereof

Abstract

The invention discloses a native wood pulp paperboard, which is formed by compounding three layers of paper, which are a surface layer, a core layer and a bottom layer respectively, wherein the used raw materials are unbleached native natural wood pulp fibers; and the native wood pulp paperboard comprises a repulping and grinding procedure; a color and luster control procedure; a fourdrinier wire and top wire forming procedure; a shoe pressing procedure; a sizing procedure; a drying procedure; a hot-roller soft calendaring procedure; and a slitting and rewinding procedure. Through mutual cooperation of the fourdrinier wire and top wire forming procedure, a starch spraying procedure and the hot-roller soft calendaring procedure, the application effect that a non-coating process can also meet the printing adaptability is achieved; through application of the native natural wood pulp fibers and improvement of sheet-making, sizing and calendaring processes, harmful substances introduced by the bleaching and coating processes are eliminated; the native wood pulp paperboard completely meets the food grade requirements; the health and safety indicators are improved; the pressure of environmental pollution is reduced; and the cost is greatly reduced in comparison with that of a coated cardboard.

Description

technical field [0001] The invention belongs to the technical field of cigarette packaging material processing, and in particular relates to a raw wood pulp cardboard and a preparation method thereof. Background technique [0002] In recent years, China's tobacco packaging technology has achieved rapid development. There are many types and names of packaging cardboard, ranging from ordinary white cardboard, glass cardboard, aluminum foil gold and silver cardboard to PET mirror composite cardboard. However, it is always the same. Although the surface of these packaging cardboards is ever-changing, the base paper has not changed much, and the coated white cardboard is generally the main one. [0003] Long-term production practice shows that the current coated white cardboard has the following defects: First, the printing process is very dependent on the coating process. The surface of cardboard without coating process is too rough, and the printing adaptability is extremely p...

AI Technical Summary

Problems solved by technology

[0003] Long-term production practice shows that the current coated white cardboard has the following defects: First, the printing process is very dependent on the coating process

The surface of cardboard without coating process is too rough, and the printing adaptability is extremely poor. It is difficult to meet the various processes required for cigarette pack printing, such as offset printing, gravure printing, bronzing, etc., and the reality of very fine printing patterns; secondly, coating Due to the need to use kaolin, the process introduces the problem of heavy metal residues and paper lint and powder; third, the wood pulp of white cardboard needs to be bleached, and the bleaching process will release many harmful substances, such as AOX (adsorbable organic halides) ), dioxins, etc., have multiple negative impacts on the hygiene and safety of food packaging and environmental protection; fourth, bleaching and coating processes lead to high paper costs

The above four points are difficult to meet the application requirements of cigarette pack printing in food, hygiene, printing quality and many other aspects

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