Takeoff Color Printing Machinery Factory develops a cold set corrugated board production line

At the seminar on upgrading and reforming the national corrugated board production line held recently, Zhu Qingdong of the Takeoff Color Printing Machinery Factory of Wuxi City introduced the cold qualitative corrugated board production line developed by the plant. This kind of production line uses microwave or electromagnetic wave to dry the moisture of the corrugated paper starch adhesive glue, the production cost is lower than the steam drying, the enamel type remains intact, and the glue is saved.

Zhu Qingdong analyzed the problems existing in traditional corrugated cardboard lines from four aspects.

The first is that the amount of glue used is more than water. The molecular structure of traditional corn starch determines the water content of the glue. When the moisture content is less than 65%, the starch will not be gelatinized and no viscosity will be produced. However, if the amount of glue is small, it cannot be bonded. When the amount of water absorbed by the paper exceeds 20% of the total amount of water in the glue within 20 seconds, the water content in the glue is too small to gelatinize with the starch, and therefore it cannot be bonded. And the moisture evaporated after gelatinization heats down the paper strength.

The original compounding method causes the moisture in the glue during the dehydration process to directly generate steam and be absorbed by the paper and then evaporate. In the process of absorption and evaporation, the paper is deformed (deformed and shortened), so that the strength is reduced, and the surface paper and the liner paper are blurred, which affects the appearance and printing.

Evaporation of water vapor can cause differences in paper tension at different humidity levels. The compounding cost of the high-speed line is higher because the paper is not preheated and the starch is difficult to gelatinize in a short time. Therefore, in order for the paper to warm up quickly in a short period of time, the supply temperature must be increased, resulting in an increase in cost.

Second, the gelatinization rate of starch is determined by the temperature. With high temperatures, the speed can be increased accordingly; at low temperatures, the speed must be reduced. The moisture content of 65% to 85% in the glue must be heated and dried, which also increases the cost.

Third, the traditional corrugated board production line has high temperature load and the machine wears. The high temperature causes the metal to expand. Different materials have different coefficients of expansion, so the load increases and the motor consumes more energy. And as the temperature of the machine increases, the wear increases, the service life shortens, and the use cost increases.

Fourth, the production line supporting the boiler to burn coal produces carbon dioxide and dust, destroying and polluting the environment.

Zhu Qingdong said that the plant has developed a new generation of polymer glue for the cold set corrugated paperboard production line. It can use 10 grams of glue to bond the corrugated paper (single machine), and can use 25 grams of glue to compound the face paper. This not only reduces the cost of plastic, but also reduces the evaporation of moisture, the paper is not easily deformed, the maximum height and shape are maintained, and significant blemishes are not achieved.

Zhu Qingdong introduced that because of the cold-setting and cold-combination of the machine, the whole machine's operating load is low, saving more than half of the energy of conventional equipment. Machines working at room temperature have little mechanical wear and can extend their service life by a factor of three. Eliminating the need for heating boilers and plants, heating rollers, and paper stacks. Cold set compounding solves the problem of combination printing because it reduces friction and improves preprint quality and productivity.

At present, Wuxi Tengfei Color Printing Machinery Factory produces two types of models, one is a microwave board production line and the other is an electromagnetic wave board production line. Two kinds of production lines have their own advantages. One can use glue amount to adjust the cardboard strength index. One can maximize energy saving. The production cost of electromagnetic wave production line per square meter of corrugated board in the case of raw paper moisture standard is as follows: , glue, salary) 0.06 yuan, five-tier line 0.1 yuan.

Source: China Packaging News