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During printing, the printed sheet is pressed by the ink on the rubber cylinder to the surface of the blanket with adhesive force. On the other hand, the bite of the paper is bitten by the teeth of the impression cylinder. Rotate to force the paper to separate from the rubber roller. The paper sticking to the surface of the rubber cylinder is perpendicular to the surface of the paper, and the force pulling the paper from the surface of the blanket is called the peeling tension. If this peeling tension makes the surface strength of the substrate unbearable, the fibers and fillers on the surface of the paper Or the paint will be pulled down by the ink on the blanket and accumulated on the surface of the blanket and the printing plate, so that the ink cannot be absorbed and transferred to the paper uniformly and completely, causing dot damage and small dot loss; when printing the mesh to adjust the image, the level Lost, the imprint is false. The accumulation of paper scraps on the printing plate and the blanket will damage the blanket in severe cases, and the scraps sticking to the printing plate will also be transferred to the water bucket, reducing the effect of the dampening fluid.
When brushing occurs, the number of times to wash the blanket must be increased, which increases the labor intensity of the printing worker and affects the production efficiency. At the same time, due to excessive shutdowns, the ink supply is uneven, and the ink color of the printed product is printed. It is easy to be inconsistent before and after, and when it is serious, there will be waste products, causing unnecessary waste.
There are many factors that cause paper fluffing. There are two main factors, one is the surface strength of the paper, and the other is the peeling tension during printing. The peeling tension depends on the viscosity of the ink and printing speed.
Different papers have different raw materials and papermaking processes. The surface strengths vary greatly. Papers with poor surface strengths are prone to fluffing. During multi-color offset printing, the post-printing color is wetted by the wetting liquid in the blank part. When printing on paper, after the paper is wetted, the surface strength decreases and the plucking phenomenon will increase.
The method to solve the hair pulling is:
First, according to the characteristics of printing equipment and printed products, choose paper with suitable surface strength.
The second is to reduce the viscosity and viscosity of the ink by adding ink or tackifier to the ink. This is the most commonly used method when printing paper with poor surface strength. The pulling phenomenon will increase with the increase of the viscosity of the ink, and the viscosity of the ink is most affected by the temperature, so the printing workshop should maintain a constant temperature as much as possible, so that the printing workshop has an ideal production environment. Ink or de-tackifier should be adequate, otherwise it will cause a series of problems such as heavier ink emulsification, enlarged dots and extended drying time.
The third is to control the printing speed when printing paper with poor surface strength. The higher the printing speed, the greater the peeling tension when the paper and the blanket are peeled off, and the easier it is to pull the hair. The binding force of the fiber and filler on the surface of the paper is large and small, uneven, and the bonding strength of some particles and fibers is small. When the printing speed is not very high, the hair-drawing phenomenon occurs, but it is not serious. However, the binding strength of most particles or fibers is equivalent. Only when the printing speed is higher than a certain critical point, the peeling tension reaches a certain level, will the relatively serious pulling phenomenon occur. And as the speed increases, the pulling phenomenon will continue to increase, so when printing paper with poor surface strength, the printing speed should be controlled to print at a slower speed.
Fourth, replace the blanket, or wipe the blanket with talc powder and sulfur powder to reduce the viscosity of the blanket. The fluffing phenomenon during printing is sometimes caused by the sticky blanket, so after each printing task is completed, the plate should be unloaded in time and the blanket should be cleaned. In addition, when conditions and time permit, when printing paper with poor surface strength, a single-color machine can be used to print, which can reduce the plucking phenomenon and will not affect normal production.
A training desk is a table designed specifically for activities such as training and meetings. It has characteristics such as durability and ease of movement, which can meet the needs of different groups of people. Training desks can be classified into various categories based on their materials, structure, and other aspects. Below will be a brief introduction to the classification of training desks.
1. Material classification
The materials of the Training Chair mainly include wooden boards, PVC boards, etc. Training desks made of wood usually have strong stability and durability, making them suitable for long-term meetings or training activities. The training table made of PVC board has certain safety performance and is generally more lightweight.
2. Structural classification
The structure of training chairs mainly includes single tables, combination tables, etc. A single chair is the most common training table, and each training table is independent and can be adjusted as needed. Combination refers to the combination of multiple seats together, usually in the form of geometric shapes or rows, suitable for use in large training venues. A stackable table is a training table that can be folded and placed together, saving space and facilitating storage and handling.
Training Table,Tea Table,Coffee Table,Visitor Table
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