The cardboard production line has three main functions: corrugating, laminating, and slitting. The slitting function is achieved using a paper roll slitter machine and a crosscutting machine. When using a paper roll slitter machine, it is crucial to ensure that the equipment performs stably and operates continuously. Daily maintenance and upkeep, including lubrication, cleaning, and clearing of the equipment, ensure that the sliding parts of the equipment are always in good condition, reducing wear and tear and malfunction.
When using the paper roll slitter machine, daily maintenance must be performed. The principle of maintaining the paper roll slitter machine includes proper lubrication, cleaning, and ensuring the equipment is free of dust and debris, which keeps the sliding parts of the equipment in good condition. Additionally, periodic and irregular inspections of rotating parts (especially those prone to wear and tear) are necessary. Regular adjustments, periodic replacements, and detailed record-keeping help extend the equipment’s lifespan. Regular cleaning and inspection of the electrical components are essential to eliminate potential hazards in time. While using high-quality slitting knives, it is also necessary to enhance the operators' technical skills and ensure that only authorized personnel operate the control parts.
Eliminating gaps is a key step in correctly adjusting the blades of the paper roll slitter machine. The operation steps are as follows: Typically, due to the presence of transmission gears in the crosscutting machine, the knife roller may experience circumferential slipping when cutting corrugated paper, i.e., "knife relaxation" in professional terms. The reverse rotation between the upper and lower knife rollers of the paper roll slitter machine is driven by the gears on the knife roller, so these factors must be considered when adjusting the blades. After installing the blades on the paper roll slitting machine, test cutting a newspaper is necessary to check if the gap adjustment is adequate. However, since manual test cuts exert less cutting force and slower roller rotation, leading to no "knife relaxation," the test cut results are inaccurate. When this type of the paper rewinder machine operates normally, the larger cutting force induces "knife relaxation," illustrating why improper adjustment of the blades results in insufficient cardboard cutting.
The corrugated cardboard production line is a crucial piece of equipment in the complete box packaging industry due to its high production efficiency and product quality. However, adjusting the blades of the paper roll slitter machine is often a troublesome task for operators, who need a long time to adjust the blades. If adjusted incorrectly, the cardboard may not cut properly or may have rough edges. Therefore, the blade adjustment procedure directly affects production efficiency.
Thus, the first step in adjusting the blades of the paper roll slitter machine is to eliminate gear gaps. The adjustment method is as follows: Loosen the sliding gear and the locking device of the upper knife roller on the paper roll slitter machine, then loosen the adjustment screw on one side and push the adjustment screw on the other side so that the sliding gear on the knife roller shaft slides and misaligns with the fixed gear. Make the sliding gear mesh with the broad gear of the lower knife roller without gaps between the gear surfaces of the sliding and broad gears, thereby completely eliminating the gear meshing gap between the upper and lower knife rollers. During adjustment, ensure the amount of adjustment is appropriate; both ends of the roller's adjustment screws must advance and retreat simultaneously without overtightening. After adjusting, tighten the adjustment screws and locking nuts.
Hard alloy circular blades are highly wear-resistant, with a lifespan several times longer than ordinary high-speed steel thin blades when cutting corrugated cardboard. Proper usage can improve slitting quality and extend blade life, while incorrect usage can lead to blade breakage and chipping. Blade breakage is a significant headache for cardboard factory operators.
Due to the high hardness and brittleness of hard alloy circular blades, they must be handled, stored, and installed with care. They should be placed horizontally and kept away from any hard objects to avoid collisions. Before installing the blade, ensure the end face of the knife holder's rotation is within the normal range (less than 0.1mm). Check that the flatness of the knife holder meets the standard. After cleaning the knife holder, install the blade. Ensure there are no foreign objects between the blade and knife holder and the fitting gap is correct before diagonally tightening the pressure plate bolts, ensuring even force, proper tightness, and avoiding forced assembly and impacts on the blade. It's recommended to add a paper gasket between the blade and the pressure plate to buffer the hard fit between them.
Adjust the grinding wheel gap to prevent blade breakage due to distortion during grinding. After installing the grinding wheel, check if the grinding wheel seat bolts are loose; excessive end face runout of the grinding wheel may cause impacts during grinding, leading to blade breakage. The grinding wheel angle should approximate the blade edge angle. The stability of grinding is determined by the travel gap between the fixed and moving blocks of the grinder, with a required gap of 3-5mm. During grinding, slow the grinding wheel feed speed, maintain air pressure around 2KG, avoid grinding wheel impacts on the edge. Each grinding amount should not be excessively large, and it is recommended to have a dedicated person perform light manual grinding each shift to achieve sharpness. The grinding duration depends on the blade’s sharpness and cutting quality; avoid frequent grinding and usage of blades with serrated edges.
Before adjusting the blade distance, loosen and reposition the knife rest. After adjusting the blade distance, position the blade in the middle of the knife rest slot, preventing friction between the blade and knife rest. Avoid tool, equipment parts, or other hard object collisions with the blades during adjustment. Check the thin blade edge daily, perform light grinding when necessary, periodically inspect the thin blade surface, and remove dirt in time. Stop the machine to inspect if the tool has defects and clear the knife rest slots of paper scraps to prevent blade jamming. Regularly observe the knife holder's operation; if excessive end face runout occurs, stop the machine immediately for maintenance to avoid losses. Check the tightness of bolts and locking blocks before using the equipment to ensure normal operation. For computer-controlled blade adjustment equipment, avoid dry friction between the blade and lower knife holder during operation to prevent blade breakage. Operators should not stand directly in front of the thin blade and must maintain a safe distance, always prioritizing safety to prevent injuries from blade breakage.
