Dry goods | Are you sure you choose the right printing paper?

Dry goods | Are you sure you choose the right printing paper?

Paper is composed of various plant fibers (for pulping), and various necessary chemical additives are added. The paper machine filters the water suspension of pulp fibers through the screen, squeezes the water in the press section, and evaporates the water in the drying section. Sizing, coating, calendering and other complex processes are produced, so it has some inherent characteristics. In the selection, use, and storage, pay attention to its characteristics, which can make production more efficient.

　　The selection of special paper

　　 For choosing paper, general printing houses do better, but they still need to understand some special products. For special applications, it is necessary to select paper in a targeted manner.

(1) Blister products: When choosing paper, choose paper that can be blister. The surface strength of the paper should be high but not too high. The moisture requirements are very strict. In printing, the ink should not contain silicone oil, paraffin wax, or spray. Too much powder, otherwise it will cause problems in the subsequent process of blister.

(2) For the laminated products: It is best to choose the same variety of products, because their raw material ratio, production process are the same, and the paper performance is the same, it will not be because this side is white cardboard and the other side is white. The white paper is deformed after being laminated, which affects the quality of the end product. It should also be noted that when one side of the paper is thin paper and the other side is thick paper, the thin paper is easier to absorb water and needs to be treated differently when lamination.

　　 (3) Gravure cardboard: Choose cardboard to have good flatness, small roughness, good smoothness and uniform density. Paper-making companies provide different grades of cardboard for customers to choose according to the printing method.

　　The most suitable is the best. In the purchase and use of paper, it will be twice the result with half the effort to adopt the policy of doing something and doing something wrong.

　　Unpacking and slitting

Unpacking: Pay attention before unpacking. It is best to adopt the first-in-first-use principle, because the paper has a maturity period. Generally, it is best to use it in two months. During this time, the paper needs to adapt and balance. Process, such as stiffness will increase, moisture will be more balanced, static electricity will be smaller, and many indicators will tend to be relatively stable. Experienced printing factories also understand this. They commonly call cooked paper for paper stored for a certain period of time, and the production will be smoother. Imported paper has reached a balance period due to long distances and long transportation time. This is also explained by the better use of imported paper.

　　 Slitting: When paper slitting, it is required to briefly check the unpacked paper for entrainment, and ensure safe operation, and do not drop gloves, pens, etc. into the paper.

　　 Note that the cutting knife should be as sharp as possible, so that the produced paper has no burrs, less paper lint, and less white spots during printing. The four corners of the cut paper should be perpendicular to the bisector, and there should be no skew. The size of each stack of paper should be the same, the cuts should be neat, there are no cuts, cuts, and the cut is not even the knife. The individual edges of the paper are connected with fibers, which are more or less hard torn. During the transportation process, it is not easy to roll up the edges of the paper, or in some cases, the paper is hard to roll up due to the convenience of moving the paper in the direction of the stack. And delamination, causing printing damage to the blanket.

　　The cut paper cannot be used immediately, so it must be marked to avoid confusion. At the same time, papers of different specifications or different threads and different front and back sides should be stacked separately, and they should also be marked, not to collide, and placed properly.

After the paper is unpacked, it should be cut and printed in a short period of time as much as possible, because environmental influences will cause the paper to be deformed, especially when the monochromatic machine is printed for multiple times, it is more important to pay attention to protection. , Use PE film to simply wrap it for protection, or take other measures, as long as it can prevent the paper from changing its original form from the environment.

　　 After unpacking the paper, special attention should be paid to avoid direct sunlight for a long time or one side of it, which will cause the water content to drop sharply and cause deformation. In addition, long-term exposure is prone to change the hue of the cardboard, because the color stability of some pigmented paper will change under direct sunlight, which will also cause the paper to become hard, brittle, and yellow, leading to serious early "aging". Printing cannot be used, causing waste.

　　Printing process

In paper production, the fibers are more longitudinally arranged due to the impact of the headbox, and the transverse interweaving is relatively less. As a result, the longitudinal shrinkage of the paper is less, and the transverse direction is relatively large. According to some information, the transverse shrinkage is the longitudinal direction. At the same time, the wrong thread direction will also affect the final box making and the effect of making a wide box, so you should pay attention to the thread direction when using it.

　　 printing factories mostly use straight silk printing, the probability of paper elongation is small, and the deformation of the horizontal filament is large, especially when the paper contains large water content, the deformation will increase after pressure, so the printing pressure needs to be controlled properly.

　　 Control the water consumption of the layout during printing, and use as little water as possible, as long as it reaches the balance of water and ink, so as to avoid poor printing quality.

　　 printing plants need to pay attention to temperature control during the post-press processing of the paper. This is mainly because the temperature during glazing must be moderate and not too high, otherwise it will easily cause ink explosion or bursting.

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　　 The storage place needs to be sanitary, dry and ventilated, protected from light and moisture, or sun and rain. In particular, the folded paper stack should be placed away from the floor mat and not close to the wall to prevent poor ventilation and moisture.

　　 The stack of roll paper should not be too high, and it must be placed upright to prevent crushing the edge or core of the roll paper and destroying the cylindricality of the roll paper. Single sheets of paper should be laid flat and not upright.

　　 It is best to control the temperature and humidity at the production site. If there are no conditions, try to avoid opening the door for production, especially in rainy weather. Especially for coated paper, it is easy to mold when damp, and the coating peels off. Of course, if the temperature can be controlled at 20-25°C in summer, 18-22°C in winter, and humidity at 55%-65%, it is ideal.

　　 Paper is not as sensitive to temperature as it is to humidity, but when the temperature exceeds 38°C, the mechanical strength will decrease significantly. Coated paper is also very easy to cause the paper to stick to each other, so that the coating peels off and cannot be used.

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