1. The size and dispersion of pigment particles
Although the role of ink film capillary is an important factor in the formation of print gloss, the apparent size of the pigment particles in the dispersed state is more important. It directly determines the state of the ink film capillary. Thus, the pigment particles are small and well dispersed, which is favorable for the formation of a smooth ink film, and is also very advantageous for improving the gloss of prints.
2. The viscosity of the binder and the content of the pigment
According to the interface chemistry principle, the capillary permeation rate is inversely related to the viscosity of the liquid, ie, the permeation rate decreases as the viscosity increases. The capillary network structure formed between ink pigment particles is an important aspect that determines the gloss of prints. At the moment of imprinting, the ink is pressed into the larger pores of the paper as a whole; after imprinting, the binder begins to separate from the ink and penetrates into the smaller pores of the paper. Therefore, the size of the ink film capillary determines the amount of separation of the binder. The effect of capillary retention of the binder is much greater than the effect of printing pressure on pressing the binder into the pores of the paper.
3. Drying time
The rapid drying of the ink film on the paper surface can reduce the amount of pores that the binder penetrates into the paper, thereby increasing the gloss and smoothness of the ink film. The high gloss of the ink film means that the surface mirror reflection degree is relatively high, so that the human eye can see the surface reflected white light much less than the low gloss ink film in most cases, making the color saturation more high. So high gloss prints look brighter and fuller. The printing ink layer of the spot color ink is mostly semi-transparent or opaque. When selecting the ink formulation, the influence of the light transmittance of the ink layer on the spot color printing must also be taken into consideration.
Generally, the main parameters are determined according to the requirements of the material handling system, the conditions of the loading and unloading sites, the relevant production process and the characteristics of the materials.
â‘ conveying capacity: Conveyor capacity refers to the amount of material transported per unit of time. In the delivery of bulk material, the hourly delivery of material mass or volume calculation; in the delivery of articles into pieces, the number of hours per hour delivery.
â‘¡ conveying speed: improve the transmission speed can improve the transmission capacity. When the conveyor belt is used as a pulling member and the conveying length is large, the conveying speed is increased. However, high-speed operation of the belt conveyor should pay attention to vibration, noise and start, braking and other issues. For the chain as a tractor conveyor, conveyor speed should not be too large to prevent increased power load. At the same time the process of operation of the conveyor, conveyor speed should be determined in accordance with the production process requirements.
â‘¢ component size: conveyor component size, including conveyor belt width, strip width, hopper volume, pipe diameter and container size. The size of these components directly affect the transport capacity of the conveyor.
â‘£ conveying length and inclination: the length of the transmission line and the size of the angle of a direct impact on the total resistance of the conveyor and the required power.
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