Determine the dot printing process according to the characteristics of the substrate

The practice of the offset printing process shows that to completely transfer the dots on the surface of the blanket to the paper surface, only the paper with a better smoothness of the paper surface can better represent the levels and dot shape of the original manuscript. Printing dot products with rough paper will inevitably produce defective quality defects, which will directly affect the subtle performance of the printed products. The experiment proves that the higher the number of network lines, the smaller the diameter of the dots. In this case, if there is a slight depression on the surface of the paper, the dots on the printed product will inevitably appear incomplete. If you increase the printing pressure or increase the ink supply of the layout to make up for the defect of poor contact between the layout and the paper, it will cause the spread of the ink and cause the dots to expand. Therefore, good paper smoothness is an important condition for printing high-quality dots.

Fine products with a higher number of network lines have higher requirements for the smoothness of paper, which is a basic principle for printing paper selection. However, in practical work, considering the practicality and economy of the product, the paper that is often used is not determined by the printing unit unilaterally. Under the limitation of objective conditions, in order to ensure printing quality, appropriate printing process measures should be taken. To this end, by adjusting certain properties of ink or changing process measures, to adapt to the printing suitability of a certain paper. For example, printing paper with poor smoothness can appropriately increase the printing pressure, and use inks with greater fluidity and lubricity, which can overcome and make up for the void quality defects caused by poor paper smoothness. Conversely, if printing paper with better smoothness, the printing pressure can be reduced appropriately, and ink with higher viscosity and stronger adhesion can be used. Of course, the above situation is not absolute and cannot be applied mechanically and blindly. Even if there are two papers with similar smoothness, due to the difference in their structure, there should be differences in the selection of ink. For example, for the paper that uses fillers and rubber to fill the fiber gap and is super calendered, due to its tighter paper mechanism, it can be printed with inks with less fluidity and greater viscosity to obtain a clearer Imprint. For a part of long fibers as the skeleton, enough short fibers to fill the gaps between the long fibers, and after calendering to show a smooth surface paper, it must be printed with ink with greater fluidity and lower viscosity to To avoid the problems of powder falling and hair pulling during the printing process.

Due to the difference in the smoothness of the paper, in addition to adjusting the printing pressure, ink fluidity and viscosity, the printing dots can also be used to reasonably make the printing plate according to the characteristics of the printing machine, the nature of the printed matter and the quality of the paper. That is to choose the appropriate number of screen-making plate, and strive to obtain a better printing process effect to ensure the printing quality of the dot. Under normal circumstances, the quality of the paper is rough, and the speed of the printing machine is fast. The screen of 80lpi-100lpi can be used during plate making, and the printing effect is better. For printing with posters, ordinary offset paper and newspapers, 80 lpi ~ 100 lpi screen-making can be used. Secondly, for printing new year pictures and calendars with better offset paper, 100lpi ~ 133lpi screen-making can be used. The third case is to use coated paper, painted newspapers and other materials to print pictorials, postcards, desk calendars, merchandise advertisements, book covers, etc., then you can choose 150lpi ~ 175lpi screen plate. The fourth case is to use high-grade coated paper, glass cards to print fine pictures, product advertisements, book covers, illustrations, packaging and decoration prints and other high-end products, then you can choose 175lpi ~ 200lpi screen plate to achieve a better printing process Effect, improve the printing quality of the dot.

In summary, according to the characteristics of the paper and the printing conditions in all aspects, scientifically and reasonably formulate the technical measures of the printing network, which is beneficial to ensure the printing quality and improve the printing plate's durability. Only by adopting reasonable printing process measures can we fundamentally improve the process level of printed matter and enhance the market competition vitality of products.

Height Adjustable Laptop Stand

Adaptable design can be used as a desk for your laptop or for speaking engagements. Travel all around the house or take with you on the road. The small frame makes working on your sofa or bed feasible.

Sit-to-Stand Rolling Laptop Cart saves space while providing the laptop or writing setup you need.

PRODUCT HIGHLIGHTS

1.Adjustable overbed bedside tablet: You can easily adjust the table at any angle or height you want and locks firmly in position.So that the rolling Laptop Desk tilting Overbed Table can provide you a more comfortable position.

2.Safety rolling Computer Desk:The rolling bedside table can safely hold your laptop with safety edge stopper.

3.Mobile computer desk:The mobile laptop desk with wheels to move around or lock in your convinience.It is easy to drive overbed table with wheels to any room freely.

4.Versatile use:You can use it as tiltable bedside table, laptop rolling cart,TV trays for bed,over bed table with wheels.Professional design,single pole under steel frame,you can freely stretch legs of the overbed laptop table on wheels.

5.Top quality material for safe using:E1 grade table top which is water proof,welded metal base frame provides you with sturdy rolling tray table.

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