After several years of operation of the sheetfed offset press, various parts of the sheet-fed offset press have different degrees of wear (especially several open teeth cams, bumps, tooth pads and dental pads), so that the product cannot be transferred during printing. Work properly. The main fault is that the paper is torn on the edge of the paper, making it impossible to perform normal printing when the second color is overprinted, severely punishing the quality of the product. Here are some suggestions on how to troubleshoot such failures.
In the normal printing process, if there is a phenomenon that the paper is cracked, you should first find out the cause of the failure and carefully check the tearing condition of the paper. In general, there are three kinds of phenomena in the tearing of the cheeks: First, the edges of the paper are continuously torn and the position is not changed. This phenomenon is generally caused by improper handling of the paper feed teeth and drum teeth, or improper adjustment of the paper feed teeth and drum teeth. The second is that instead of tearing each sheet, the sheet is separated by a few unbroken sheets, which are regular. This phenomenon is generally found on the collection line. The third is that when paper breaks, the break is large, small, good, and broken, and there is no regularity. This phenomenon is generally caused by improper adjustment of the paper feeder or inappropriate adjustment of the front gauge. The reasons for the above three kinds of failures and their exclusion methods are analyzed as follows.
1. The edge of the sheet is continuously torn and the position remains unchanged. If this failure occurs, we must find the reason on the paper-feeding teeth and drum teeth. First, open the slow car and carefully observe the process of transferring paper between the paper handing teeth and the drum tooth, to see if it is due to the slow time of the teeth of the paper handing teeth or the insufficient degree of opening of the teeth, resulting in tearing of the paper edge. Solution: Check whether the tooth bumps of the paper-feeding teeth are worn. If they are worn, repair welding or replace new ones, and make careful adjustments. The requirement is that when the paper handing paper handed the paper to the impression roller big teeth, the distance between the paper handing tooth and the drum big tooth at the same time control the paper must be 3mm, generally 2mm. The second reason is that because the large tooth base of the drum is screwed into a round hole, the opening degree of the large teeth of the roller is not enough. When the paper is transferred to the roller tooth, the paper edge touches the drum tooth and tears. Solution: If only one or more tooth bases are damaged by the item, repair welding can be done on the machine. If there is more damage at the top, you need to replace the new one. Thirdly, the connection between the shaft of the drum teeth and the pulley frame is loose, causing the time for the teeth of the drum teeth to be too slow or the opening degree of the teeth to be insufficient to tear the edges of the paper. Solution: Check whether the pin at the connection is loose or cut. If it is loose, it can be re-pinned. If it is cut, it needs to be replaced with a new pin. Fourth, the distance between the dentition of the paper handing tooth and the side of the impression cylinder is not properly adjusted, and the distance between the dentition of the paper handing tooth and the side of the impression cylinder is not good enough, causing the paper edge torn and the distance too far to make the impression cylinder. Pull the edge of the paper when picking paper. Solution: Carefully adjust the distance between the transfer tooth pad and the edge of the embossing roller. Generally, the distance between the two should be adjusted to 0.5 mm (the thickness of the card should be two to three times the thickness of the paper). Fifth, the open teeth of the delivery teeth are worn and the opening time of the delivery teeth is slowed down. Due to the small open distance, the paper is torn. Solution: Remove the open tooth bumps by welding or replace the new ones.
2. There is a regular tearing of the edge of the sheet, and the number of sheets in the middle interval is exactly the number of the delivery rows. This situation is generally caused by improper adjustment of the delivery tooth row. Solution: Open the slow car carefully observe the consistency of each tooth of the collection tooth row, and then adjust, and then drive the paper to see if there is tearing phenomenon.
3, the paper smashed the mouth without regular paper break, and when the break is wide and narrow, this phenomenon is generally caused by the improper adjustment of the feeder or the former, should find the reason on the feeder. One is to observe carefully whether the tape tension of the feeder is consistent. The second is that the drive runs to see if the conveyor belt pulley can rotate flexibly. Third, the slow time to see if the arrival time of the paper is correct (the general requirement is that when the current gauge reaches the receiving position, when the front margin of the paper margin reaches the receiving position, the distance between the front margin of the paper margin is 8-10mm. Appropriate), if it is not appropriate to adjust. Fourth, carefully check whether the height of the pre-regulation meets the requirements (generally, the current requirement is that when the current gauge reaches the position of receiving the paper, three sheets of paper can be put into the printed paper, and it is appropriate to have a slightly cloudy state when pulling).
From the breakdown of the above-mentioned tearing of the eyelid, the following aspects must be specially noted: First, the transfer of teeth and teeth must be reasonable, it is best to adjust according to the data required in the maneuverability table on the machine instructions. . The second is that the heights of the paper teeth, drum teeth, and the receiving teeth must be adjusted to the same level. Third, the closing time and the closing size of each tooth must be the same. If the above points are noticed in the adjustment, the problem will be solved soon. (Li Ling) ("China Packaging Newspaper and Print Weekly")
In the normal printing process, if there is a phenomenon that the paper is cracked, you should first find out the cause of the failure and carefully check the tearing condition of the paper. In general, there are three kinds of phenomena in the tearing of the cheeks: First, the edges of the paper are continuously torn and the position is not changed. This phenomenon is generally caused by improper handling of the paper feed teeth and drum teeth, or improper adjustment of the paper feed teeth and drum teeth. The second is that instead of tearing each sheet, the sheet is separated by a few unbroken sheets, which are regular. This phenomenon is generally found on the collection line. The third is that when paper breaks, the break is large, small, good, and broken, and there is no regularity. This phenomenon is generally caused by improper adjustment of the paper feeder or inappropriate adjustment of the front gauge. The reasons for the above three kinds of failures and their exclusion methods are analyzed as follows.
1. The edge of the sheet is continuously torn and the position remains unchanged. If this failure occurs, we must find the reason on the paper-feeding teeth and drum teeth. First, open the slow car and carefully observe the process of transferring paper between the paper handing teeth and the drum tooth, to see if it is due to the slow time of the teeth of the paper handing teeth or the insufficient degree of opening of the teeth, resulting in tearing of the paper edge. Solution: Check whether the tooth bumps of the paper-feeding teeth are worn. If they are worn, repair welding or replace new ones, and make careful adjustments. The requirement is that when the paper handing paper handed the paper to the impression roller big teeth, the distance between the paper handing tooth and the drum big tooth at the same time control the paper must be 3mm, generally 2mm. The second reason is that because the large tooth base of the drum is screwed into a round hole, the opening degree of the large teeth of the roller is not enough. When the paper is transferred to the roller tooth, the paper edge touches the drum tooth and tears. Solution: If only one or more tooth bases are damaged by the item, repair welding can be done on the machine. If there is more damage at the top, you need to replace the new one. Thirdly, the connection between the shaft of the drum teeth and the pulley frame is loose, causing the time for the teeth of the drum teeth to be too slow or the opening degree of the teeth to be insufficient to tear the edges of the paper. Solution: Check whether the pin at the connection is loose or cut. If it is loose, it can be re-pinned. If it is cut, it needs to be replaced with a new pin. Fourth, the distance between the dentition of the paper handing tooth and the side of the impression cylinder is not properly adjusted, and the distance between the dentition of the paper handing tooth and the side of the impression cylinder is not good enough, causing the paper edge torn and the distance too far to make the impression cylinder. Pull the edge of the paper when picking paper. Solution: Carefully adjust the distance between the transfer tooth pad and the edge of the embossing roller. Generally, the distance between the two should be adjusted to 0.5 mm (the thickness of the card should be two to three times the thickness of the paper). Fifth, the open teeth of the delivery teeth are worn and the opening time of the delivery teeth is slowed down. Due to the small open distance, the paper is torn. Solution: Remove the open tooth bumps by welding or replace the new ones.
2. There is a regular tearing of the edge of the sheet, and the number of sheets in the middle interval is exactly the number of the delivery rows. This situation is generally caused by improper adjustment of the delivery tooth row. Solution: Open the slow car carefully observe the consistency of each tooth of the collection tooth row, and then adjust, and then drive the paper to see if there is tearing phenomenon.
3, the paper smashed the mouth without regular paper break, and when the break is wide and narrow, this phenomenon is generally caused by the improper adjustment of the feeder or the former, should find the reason on the feeder. One is to observe carefully whether the tape tension of the feeder is consistent. The second is that the drive runs to see if the conveyor belt pulley can rotate flexibly. Third, the slow time to see if the arrival time of the paper is correct (the general requirement is that when the current gauge reaches the receiving position, when the front margin of the paper margin reaches the receiving position, the distance between the front margin of the paper margin is 8-10mm. Appropriate), if it is not appropriate to adjust. Fourth, carefully check whether the height of the pre-regulation meets the requirements (generally, the current requirement is that when the current gauge reaches the position of receiving the paper, three sheets of paper can be put into the printed paper, and it is appropriate to have a slightly cloudy state when pulling).
From the breakdown of the above-mentioned tearing of the eyelid, the following aspects must be specially noted: First, the transfer of teeth and teeth must be reasonable, it is best to adjust according to the data required in the maneuverability table on the machine instructions. . The second is that the heights of the paper teeth, drum teeth, and the receiving teeth must be adjusted to the same level. Third, the closing time and the closing size of each tooth must be the same. If the above points are noticed in the adjustment, the problem will be solved soon. (Li Ling) ("China Packaging Newspaper and Print Weekly")
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