On the surface, the symptom of these two cases is that the cutting surface is not normal to the working surface of the machine, and the length of the same knife is different. In fact, the causes of these two defective products are completely different. This article analyzes the following reasons based on on-site processing.
①The operation performance of the paper cutter is normal, and the cut surface of the paper stack is cut into an arc shape. After inspection, the reason is that the cutting edge of the cutter is not suitable. After cutting ordinary offset paper, the operator switched to cutting coated paper, but did not replace the cutter used to cut coated paper. The cutter blade was not selected correctly, resulting in defective products. After replacing the applicable cutter, the quality of the cut product is normal. However, the cutting edge angle of the two cutters used before and after is only 2 °, which shows that the choice of the cutting edge angle of the paper cutter is critical to the quality of the cutting.
â‘¡The cut surface is inclined. After inspection, the cutting edge angle of the cutting knife is selected correctly, and there is no problem with the cutting knife. The insufficient pressure of the paper press causes the cutting surface of the product to be sloped. After inspecting many aspects that may affect the pressure of the platen one by one, it was found that the cause was that the pressure spring in the lower spool in the platen cylinder broke a section due to fatigue, which caused the work performance of the platen cylinder to be insufficient The applied pressure requires that the quality of the cut meets the requirements after replacing the intact spring.
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