The cigarette label printing industry is a special packaging industry. Almost all the latest ideas and the most advanced technologies are first reflected on the cigarette label. If the flatness of the smoke label is not good, it will bring a lot of trouble to the manufacture of the smoke label, seriously affecting the production schedule and the packaging of the cigarette label after the machine is formed. Therefore, the cigarette factory generally has a high requirement for the tobacco label printing company. In order to meet product quality requirements, the flatness of the cigarette label must be strictly controlled during the printing of the cigarette label.
The flatness of cigarette labels is closely related to the moisture content of the paper used in the production process. Because the paper fibers have the characteristics of water swelling and water loss shrinkage, when the air humidity is higher than the moisture content of the paper, the paper absorbs the moisture expansion elongation in the air. Conversely, the shrinkage of the released moisture is shortened to achieve a relative balance with the ambient humidity. Absorption and dehydration of paper have a lot to do with the temperature of the environment. The higher the temperature, the faster the rate of water loss. Because of the nature of the paper, the size of the paper changes with changes in the temperature and humidity of the environment. When the temperature is between °C and 20°C, the curvature of the paper will change from 5° to 10°. As the main substrate, if the paper is deformed in the printing process, it will inevitably affect the quality of the printed matter. The most representative image is caused by the unstable paper size. The drawbacks of this method are problems such as inaccuracy of color registration and deviation of hot stamping. Therefore, it is extremely important to control the temperature, humidity, and circulation program management in the environment in which each process is located.
First, the paper printing environment should be properly controlled to prevent the paper from being uneven due to factors such as preheating, drying, and excessive moisture.
Secondly, control the temperature and humidity of each process environment to ensure that the temperature and humidity in the process of paper and printing, hot stamping, die cutting, inspection and other processes match, the printing shop temperature should be controlled at 18 °C ~ 24 °C, relative humidity should be maintained At 60% to 65%.
In addition, zero-touch management of the paper is required between each process, and a semi-finished paper stack is strictly wrapped using a wrapping film to ensure the stability of its moisture content. In order to prevent the paper from being deformed due to too long or too short intervals before and after the process, it is also necessary to arrange the production reasonably and effectively to control the turnaround time of each process and prevent the doors and windows of the printing shop from opening wide.
In the inspection process, if there is a curling phenomenon in the cigarette label, it shall be promptly remedied. The humidification and dehumidification equipment shall be added to the workshop. At the same time, the temperature and humidity of the workshop shall be closely followed. The humidifier shall be adjusted in time according to the curling degree of the cigarette label at that time.
If the cigarette label is curled due to other reasons after the inspection is over, the cigarette label should be placed in a certain environment for a period of time. After the flatness is restored, it can be packaged again, or some compression equipment can be used to add the cigarette label up and down simultaneously. Pressure, restore flatness.
Finally, the packaging link must be strictly controlled to prevent the deformation of the smoke label during transportation and inventory.
Influence of Ambient Temperature and Humidity on the Flatness of Smoke Label
May 24 11:05:45, 2024
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