The effect of the hottest cots on the formation of

2022-08-06
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Effect of rubber roller on the formation of corrugated board in order to ensure the strength and good adhesion of corrugated board, the formation of corrugated board should be adjusted according to the different configurations of corrugated board production line

1. For the corrugated base paper entering the single-sided machine, when the water content is controlled between 9% and 12%, the corrugated forming is the most ideal. When the water content of the corrugated base paper is higher than the above indicators, it can be solved by increasing the preheating area or reducing the speed; When the water content of the corrugated base paper is lower than the above indicators, spray can be adopted. The author believes that when the single-sided corrugated board is positively ∞ shaped on the overpass conveyor belt through rapid paper transfer and the stacking distance is the same, the moisture content of the base paper and the corrugated base paper is better adjusted, and its moisture content is appropriate. The number of single-sided corrugated board stacked on the overpass should not be too large. However, in order to ensure that the double-sided machine does not stop, the number of single-sided corrugated board stacked on the overpass can be appropriately increased when the single-sided machine changes paper

2. The temperature of the dryer has a great influence on the moisture content of the corrugated board. The heating section of the corrugated board production line is usually composed of three groups (or four groups). The number of heating plates is determined by the size of the heating plates and the speed of the corrugated board production line, and each group is equipped with independent control valves. In order to ensure that the water content of single-sided corrugated board before entering the dryer is basically the same, it can be solved by adjusting the preheating area of single-sided corrugated board on the triple preheater. The adjustment method is as follows: when the water content is too high, the preheating area increases; When the water content is too low, the preheating area decreases

3. Due to the raw corrugated board "A large amount of heat is taken away through the online to offline energy generation process, and part of the saturated steam will become condensate in the preheater and corrugated roll, which can usually be discharged through the steam trap. In order to ensure the normal discharge of condensate, the author suggests that the bypass pipe valve in front of the steam trap should be opened every 4 hours for 3 ~ 5 minutes to ensure the relative stability of the temperature. The corn starch bonding is usually used to control the amount of glue applied to make corrugated cardboard Its main components are: corn starch, water, sodium hydroxide and borax. Due to different configurations of corrugated board production lines, its speed is different, and the viscosity, concentration and gelatinization temperature of the prepared adhesive are also different. With the size of the gelatinization amount, the water content of the corrugated board also changes. When the amount of glue is large, the water content of corrugated board is large, otherwise it is small. For single-sided machine and double-sided machine, the gap between the coating roller and the limiting roller is generally 0.2 mm ~ 0.25mm; The clearance between the corrugating roller and the rubber coating roller under the single-sided machine is generally 0.1 mm ~ 0.2 mm; The gap between the double-sided press roll (contact bar) and the coating roll shall be slightly lower than the height of single-sided corrugated board by 0.05 mm ~ 0.1 mm. As for the above Pu court, only 1mm can be hung on each layer, otherwise it will blister. The gap can be measured with a feeler gauge, but the two rollers should be parallel

with the change of temperature and relative humidity (summer and winter), the amount of gluing is also small. The reason is that the viscosity of the adhesive becomes thin in summer. The concentration can be adjusted by appropriately increasing the solid content. Corrugated base paper with high ring pressure index and poor moisture absorption can be used; The fluidity of the adhesive is poor in winter. It can be ensured that the adhesive has good fluidity by increasing the temperature of the adhesive. In addition to the above factors that affect the strength of corrugated board, strengthen the operator's heart and improve the operator's technical level, so that each operator can reduce the shrinkage by adopting direct gate or large section gate to careful observation and careful adjustment. Only by strictly following the process requirements of replacing a good Rotorless vulcanizer detector, can high-quality corrugated board be produced. (end)

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