All the problems encountered in the Meiyu Season Carton Factory will help you get it done at once!
Friends who work in a carton factory have struggled for such a period of time every year. This is the time of the rainy season. It is not the cardboard and carton storage that needs special attention. Even cardboard production and cardboard printing need to be especially careful, otherwise they will be caught by customers Complain or return. Today we will tell you how to adjust to fully respond to the rainy season from warehousing, cardboard production and cardboard printing.
How to control the storage environment during the rainy season to ensure stable product quality
The base paper, semi-finished products and products of the carton factory are all paper products, and their distinctive feature is that they have strong moisture absorption characteristics and are very sensitive to air humidity. The moisture of the base paper, corrugated cardboard or carton easily changes with the difference in air humidity. If the warehouse is poorly ventilated and the environment is relatively humid, it is easier to make the product absorb moisture or even mildew. In particular, base paper with poor sizing degree and corrugated boxes made of low-grade materials are more prone to moisture absorption and softening, which greatly reduces product quality. Therefore, in the rainy season, we should pay more attention to the moisture-proof work of the base paper, semi-finished products and carton finished product warehouses.
When the products are stacked, the height of the wooden frame should be used, the distance from the ground should not be less than 750px, and should not be too close to the wall, the distance should not be less than 1250px. The warehouse should be kept clean, dry, well ventilated, and the temperature and humidity should be kept relatively stable. The general temperature should be controlled between 20 ℃ -25 ℃, and the relative humidity of the environment should be controlled between 60% -70%. If the warehouse temperature is greater than 38 ℃, it is best to take ventilation and cooling measures to prevent the product from being affected by high temperature, causing the paper to embrittle and deteriorate and reduce the strength of the finished carton.
How to control the moisture of paperboard in rainy days to ensure that the physical indicators of paperboard can reach the standard?
In Meiyutian, the phenomenon of the resurgence of cardboard began to increase significantly. The problem that often occurs is that the physical index of cardboard is still sufficient during production testing, but the physical index of cardboard is not enough when it is about to be delivered. This is mainly reflected in the softening of cardboard. The main reason is that the cardboard is softened by the environmental moisture, and the compression value of the carton is reduced. Big companies, such as Arowana, Wahaha, etc., have requirements on the carton pressure resistance. So how to control the moisture of paperboard in rainy days to ensure that the physical indicators of paperboard can reach the standard? Let me introduce you from the perspective of production technology.
Production process improvement
1. Misunderstanding of cardboard moisture control
In the production process, many companies are prone to misunderstandings. They believe that the lower the moisture of the paperboard in Meiyu days, the more rigid and compressive the paperboard can be. But in fact, when the cardboard is particularly dry, the cardboard absorbs moisture more easily and faster.
From the process point of view, the low moisture content of paperboard must first increase the heated area and temperature of the paper. When the temperature is too high and the heated area is too large, the paper fibers will be damaged. The paper fibers will break and the precision of the paper will be reduced accordingly. This is like a sponge. If you dry the sponge and put it in a humid environment, the sponge will absorb moisture faster and absorb more. Therefore, during the rainy days, the moisture control of the cardboard should be moderate, and the cardboard should not be too dry.
2. Paste
In the rainy season, we must first control the amount of paste, which is also the water, the greater the amount of paste, the greater the water content. When the moisture is high, the cardboard will become soft. Mei Yutian should relatively increase the solid content of the paste, and increase the viscosity of the paste by increasing the solid content. After the viscosity increases, the permeability of the glue increases to reduce the amount of paste, which directly reduces the moisture. Increase the moisture of the cardboard, and then increase the amount of borax. Borax has a drying effect, so that we can ensure the moisture and dryness of our cardboard.
3. Original paper
In this season, we must strengthen the control of the corrugated board material structure. According to the physical indicators such as face paper, liner, middle clamp, and corrugated paper, the compressive strength, quantitative and other physical indicators, calculate the relevant physical cardboard and corrugated board Compressive strength after boxing. Secondly, can the physical properties of the base paper meet the specified requirements, can not blindly reduce the weight, and can not blindly "steal paper".
When the rainy season guarantees the strength of the cardboard, it is a matter of urgency, and there are many improvements. For example, the types of fibers purchased from the base paper and the papermaking process can help the cardboard improve physical indicators and prevent the paperboard from moisture. The storage area of ​​already cardboard is also very critical, and you can formulate corresponding goals and improvement measures according to your own situation.
Why does carton printing always blur and deink in Mei Yutian? How to control?
In this season, the printing machine is most prone to printing blur and deinking. Due to the high humidity of the corrugated cardboard due to the high weather humidity, which causes the cardboard to become soft, the printer must increase the pressure. When the ink is transferred to the paper, due to the high humidity of the corrugated cardboard, it is easier to form font expansion and cause printing paste. Furthermore, the high humidity of corrugated cardboard will also cause the printing surface to deink. So how to control it?
1. Press pressure
In Meiyu days, the paper feed gap must be controlled, and the gap should be controlled within -0.4MM of the cardboard thickness. Because the cardboard itself is relatively soft, if the feed gap is too tight, the cardboard will be crushed, and the subsequent printing pressure must be increased, so that it is easy to cause paste and deinking. Reduce the paper feeding pressure, then the hardness of the paperboard is guaranteed, so that the printing pressure can be reduced, and the clarity of the printing is guaranteed.
2. Ink
The high viscosity of the ink is also one of the important causes of printing blur and deinking. Therefore, in Meiyutian, the viscosity of the ink must be low to increase the color density of the ink, so that the drying speed of the ink will be accelerated, so as to avoid the printing paste and deinking caused by the ink.
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