Manufacturing process for high-strength corrugated board

Abstract

The invention relates to a manufacturing process for a high-strength corrugated board. The manufacturing process is improved from an original paper production process to a drying process in a number of aspects, the high strength of the corrugated cardboard is ensured, the crack resistance is high, the rupture resistance and tear resistance are good, and the service life is long. The original paperproduction process is improved, a traditional chemical mechanical method and mechanical method are replaced with an explosion pulping, and obtained original paper has the characteristics of being high in strength, high in yield, low in cost, lower in energy consumption and the like; and a preparation process of a high-strength adhesive is improved, the problem that a starch adhesive is prone to being dilute and unstable in performance in the process of recycling is solved, the situation that the bonding strength and edge crush strength of the corrugated board are decreased due to the fact that the corrugated board produced by using the starch adhesive is prone to getting damp and being soft is avoided, the strength of the corrugated board is improved, preparing and laminating technologiesare improved, the strength of the corrugated board is further improved structurally, a drying technology is improved, and the corrugated board has higher strength and is tightly combined.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a manufacturing process of high-strength corrugated cardboard. Background technique [0002] Corrugated cardboard is a multi-layer bonded body, which is made of at least one layer of corrugated paper and one layer of cardboard paper. It has good elasticity and extensibility. It is mainly used to make cartons, carton sandwiches and other fragile goods. Packaging Materials. [0003] Traditional corrugated cardboard generally adopts chemical mechanical method or mechanical method in the production of base paper. The chemical mechanical method or mechanical method has the disadvantages of high energy consumption, low yield, and low paper strength. It is necessary to add a large amount of chemical preparations, the cost is high, the treatment of chemical pollution needs to be considered, and the environmental protection is poor. If only the mechanical method is used to manufacture the base...

AI Technical Summary

Problems solved by technology

[0003] Traditional corrugated cardboard generally adopts chemical mechanical method or mechanical method in the production of base paper. The chemical mechanical method or mechanical method has the disadvantages of high energy consumption, low yield, and low paper strength. It is necessary to add a large amount of chemical preparations, the cost is high, the treatment of chemical pollution needs to be considered, and the environmental protection is poor. If only the mechanical method is used to manufacture the base paper, the pulp yield is low and the energy consumption is high. In China, almost all corrugated boards are currently produced. Starch adhesives are used, but the current starch adhesives are generally easy to become thinner during recycling, have unstable performance, and are easy to precipitate and cannot be used continuously. Problems such as the decrease of corrugated cardboard will affect the production and use of corrugated cardboard. In the stage of material preparation and paper mounting, the traditional manufacturing process directly processes the base paper produced without the material preparation process. Generally, the base paper produced is due to high internal humidity or If it is too low, it can hardly meet the requirements of corrugated processing. If the humidity of the base paper is not adjusted, the base paper will often break when processing corrugated, which will affect the processing quality of corrugated board. Because the middle core paper of traditional corrugated board is mostly U Type or W-type structure, the corrugated cardboard of this structure has good longitudinal force but poor transverse force, and it is prone to bending when it is stressed, and the strength of the structure is not high. At present, the drying method in the manufacture of corrugated cardboard is nothing more than There are two types, one is natural drying, and the other is rapid forced drying. Although the natural drying method can make the corrugated cardboard and the internal adhesive fully contact and adhere, it can avoid the internal adhesive drying too fast and produce glue. Accumulation phenomenon, but the natural drying method to manufacture corrugated cardboard not only needs to occupy a large area of ​​factory buildings, but also for the thunderstorm season in the southern provinces, even if it is left to dry for a few days, it cannot meet the requirements for drying the carton, especially the corrugated cardboard with starch adhesive The moisture content is relatively high. After 24 hours of natural drying, the moisture content of the bonded cardboard is still very high, which fails to meet the general requirements for the moisture content of the carton. The corrugated cardboard made by the rapid forced drying process can reach the moisture content of the carton. It is less than 14%, and can make the internal adhesive dry quickly, so that the adhesive can be set quickly, avoid the oxidation phenomenon caused by excessive air in the adhesive, and fully retain the internal viscosity of the adhesive. However, if the corrugated cardboard is dried directly by the rapid forced drying method, It will cause the adhesive to be directly dried and shaped without sufficient contact with the corrugated cardboard, resulting in gaps inside the corrugated cardboard and affecting the strength of the corrugated cardboard

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