There are three major factors in the production of corrugated board: temperature, paste, and tension. For the operator, it is necessary to adjust these three elements to the corrugated box machine spare parts best conditions to produce high-quality corrugated board. Corrugated board degumming is also seriously related to these three elements.
(a) The binder raw material does not meet the requirements, especially the content of the gray powder in the starch has a great influence on the adhesive strength of the paste. Only the raw materials used for paste making meet the standard requirements to produce a qualified paste.
Solution: Test the paste into the factory and use qualified paste.
(2) The ratio of the paste and the mixing time must be strictly enforced according to the requirements. If the paste is too thin and thick, it can cause poor adhesion of the paperboard. Paste is too thin, is equal to add water to paper, easily absorbed by paper, low bond strength, easy degumming. The paste is too thick, the initial viscosity is slow, it is difficult to gelatinize, and the bonding quality is poor, resulting in degumming.
Solution: Strictly follow the mixing ratio requirements and mixing time requirements for paste making. The viscosity of the paste is strictly controlled. Under normal circumstances, the viscosity of the single-sided machine paste is 50 seconds to 60 seconds, and the double-sided coater is generally controlled at about 100 seconds, and the paste prepared on the day is used. The control of the viscosity also depends on the weather conditions, the quality of the paper Corrugated Line, and the moisture content, depending on the accumulated experience of the operator.
(3) Temperature is the main factor affecting the bonding degree of the cardboard. When the temperature is low, the paste cannot be pasted, and the cardboard will be debonded. If the temperature is too high, the starch will be destroyed and degumming will also occur.
Solution: Paste paste temperature is generally 160 °C ~ 180 °C is appropriate, to reach this temperature range, we must first ensure that the steam boiler supply must be saturated steam, the pressure to reach more than 0.9Mpa. When the Corrugated Cardboard Line is in operation, the paper needs to take a lot of heat, so that a large amount of saturated steam in each roller becomes condensed water, and the condensed water must be discharged in time. Therefore, in the circulation system of steam, the drainage system must ensure smooth flow. The position of the siphon in each roll should be correct, and the displacement of the trap should be 2 to 3 times that of the condensate. Every week, the trap outlet of the trap is opened for cleaning to ensure the smooth flow of the trap.
In operation, when the temperature is low, the operation speed can be reduced; when the temperature is high, the operation speed should be increased.
(4) The amount of glue applied affects the adhesion of cardboard. The amount of glue is too small, the adhesion is small, easy to open the plastic. The amount of glue is large, the moisture content is large, the gelatinization is not easy, the initial adhesive force is low, and the degumming is caused when dragged on the overpass. Under normal circumstances, the width of the glue line is preferably 1.5mm to 2mm Corrugator Plant.
Reproduced from: China Corrugated Machinery Equipment Network
