In the overprinting process of gravure aluminum foil, tension adjustment and changes directly affect the accuracy of overprinting and printing, which is one of the key factors in the control of the printing process. The tension control system of the aluminum foil printing machine is a special follow-up system whose input quantity changes according to some adjustable attenuation law. Tension control is the core of the whole machine control. As long as the tension control is stable and the tension change is small, the precision and scrap rate of aluminum foil in overprinting can be easily controlled. However, during the aluminum foil printing process, the fluctuations and changes in tension are many and require careful analysis.
1. As the material roll of the printing machine is in the process of winding and unwinding, the diameter of the winding and unwinding is constantly changing. In the case of unwinding, when the braking torque is constant, the diameter decreases, and the tension increases accordingly. Rewinding is the opposite. If the winding torque is constant, as the winding diameter increases, the tension will decrease. This is determined by the inherent characteristics of the printing press, and is also the main factor causing the change in the tension of the aluminum foil.
2. The unevenness of the quality of the aluminum foil material affects the change of tension, such as the fluctuation of the elastic modulus of the material, the change of the thickness of the material along the width and length, the eccentricity of the material roll, and the heating level will give the whole machine tension Bring subtle effects.
3. During the process of material changing or material breaking, the printing machine will suddenly cause the original machine's already stabilized tension to suddenly change. The higher the running speed of the equipment, the greater the interference, the large change in tension and the poor stability. It should be automatically adjusted randomly according to the tension interference of the material belt to restore the tension to the original stable state in time. In overprinting, the printing web must be moderately tensioned when it is conveyed. If the tension is too small, the web at the detection location is prone to jitter, affecting the accuracy of the overprinting. The tension must be constant to ensure constant instantaneous linear speed and require the main motor to run It should be stable, not fast and slow, and not vibrate, otherwise it will affect the accuracy of overprinting.
Office sofa is a common type of chair furniture in the office, providing employees with a comfortable working environment and rest space. According to different functions and design styles, office sofas can be divided into multiple categories.
1. Classification by Function
1) Rest sofa: The rest sofa is designed to provide a place for employees to rest and relax. It usually uses soft materials and comfortable seat cushions to provide a comfortable sitting posture and support. Rest sofas are usually large and can be used by multiple people simultaneously, sometimes equipped with armrests and backrests to provide better support and comfort.
2) Reception sofa: A reception sofa is a place used to receive visiting guests, usually placed in the reception area of the office. It generally adopts a simple and elegant design style, paired with a fashionable appearance and comfortable seat cushions, to leave a good impression on visitors.
3) Conference sofa: A conference sofa is a chair furniture used in office meeting rooms. It usually adopts a minimalist design style, paired with comfortable cushions and support to provide a comfortable meeting environment. Conference sofas are usually large and can be used by multiple people at the same time. Sometimes, they are also equipped with a desktop and socket, making it convenient for attendees to discuss and use electronic devices.
2. Classified by design style
1) Minimalist style sofa: Minimalist style sofas are characterized by simple, clear lines and simple shapes, emphasizing functionality and practicality. It usually adopts neutral tones and simple design elements, suitable for modern office decoration styles.
2) European style sofa: European style sofas are characterized by luxurious and exquisite decorations and curved shapes, giving people an elegant and romantic feeling. It usually uses delicate carvings and patterns, suitable for traditional or luxurious office decoration styles.
3) Modern style sofa: Modern style sofas are characterized by a simple and fashionable design, emphasizing smooth lines and practical functions. It usually adopts simple geometric shapes and neutral tones, suitable for modern office decoration styles.
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