Whether the size of the paper cut meets the specifications, whether the cut is smooth and the height of the paper stack, the geometry of the cut and the sharpness of the sharpening edge, the pressure of the paper stack, the type and moisture content of the paper, and the state of the cutter relationship.
1. The height of the paper stack. As the height of the paper stack increases, the error in cutting size increases. Because the paper stack is too high, the pressure of the paper press is increased accordingly, and the shear resistance of the paper stack is large, thereby increasing the bending deformation of the paper stack, and the cut paper will appear short at the top of the stack. Therefore, it is better to control the height of the cut paper stack below 100mm.
2. The shape and sharpness of the cutter. When the double-sharpened blade is used to carry the knife, the friction and cutting force of the paper stack against the beveled surface of the knife is reduced, and the accuracy of cutting is improved. The sharpness of the blade grinding, the resistance of the cut object to the cutting blade during cutting is small, the wear and power consumption of the machine are small, and the cut product is neat and the cut is smooth. Conversely, if the sharpening edge is not sharp, the cutting quality and cutting speed will decrease, and it is easy to pull out the paper on the paper stack during cutting, and the upper and lower knife edges are inconsistent.
3. The pressure of the paper stack. The paper press must be pressed along the cutting line of the paper. As the pressure of the paper press increases, the possibility of the paper being pulled out from under the paper press is small, and the accuracy of cutting is high. The adjustment of the pressure of the paper press should be adjusted according to factors such as the type of paper cut, the cutting height, and the sharpness of the grinding edge.
4. The type of paper. When cutting different types of paper, the pressure of the paper press and the blade sharpening angle should be adopted. The correct pressure of the paper press should be such that the cutter can cut into the paper stack in a straight line. It is generally believed that when cutting soft and thin paper, the pressure of the paper press should be higher. If the pressure is small, the paper on the paper stack will be bent and deformed, and the upper layer of the paper stack will be greatly deformed. The paper after cutting will appear on the paper. Long and short phenomenon; when cutting hard and smooth paper, the pressure of the paper press should be smaller. If the pressure is too large, the blade will easily deviate to the side with less pressure during cutting, and the cut paper will appear on the paper. Short and long. When cutting hard paper, to overcome the cutting resistance, the sharpening angle of the knife should be larger. Otherwise, due to the thin grinding edge, the paper's shear resistance cannot be overcome, and insufficient cutting under the paper stack is formed, which affects the cutting quality.
5. The moisture content of the paper. As the moisture content of the paper increases, the cutting resistance decreases and the accuracy of cutting increases. At the same time, when the moisture content of the paper is large, the friction coefficient is large, and the part of the paper stack that is cut is difficult to move from the inclined surface of the knife, squeezing the cutting knife, which affects the accuracy of cutting. The optimal moisture content in paper is about 7% to 8%.
6. The state of the paper cutter. The parallelism and height of the cutting blade and the working table, the perpendicularity of the cutting blade and the working table, the parallelism of the working surface of the paper pusher and the cutting line, and the perpendicularity of the working table are very important for ensuring the cutting quality . During the installation and maintenance of the paper cutter, these parts should be accurately adjusted so that the blade and the blade are opposite, and the paper is cut according to the requirements. The above factors that affect the quality of cut sheet paper are also factors that affect the cutting quality of books and periodicals.
7. Different binding methods. The difference in thickness between the front opening and the back of the book block is different. For book blocks to be trimmed on three sides, the thickness of the front opening and the back of the book should be basically the same. The greater the difference between the two, the worse the accuracy of the cut. The cutting height should be adjusted according to the paper quality, binding method and book thickness.
For the paperback book with the cover wrapped, the wet and dry degree of the glue layer in the back of the book should be moderate. If the back of the book is not dry enough, the glue will overflow and adhere to the side knife when cutting; if the back of the book is too dry, the side knife will quickly become dull during cutting. Both situations make cutting difficult.
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