The factors that affect the service life of the die-cutting knife mainly include: the type of the printing material that is die-cut, the type of ink printed on the printing material, and the maintenance situation. If the printed matter is printed with metal inks such as gold and silver, the die wear will be accelerated during die cutting. The holding point of the round die cutter is large investment and easy to damage, so it must be used and maintained correctly. Methods as below:
1. Transportation
When you need to pack and transport, you must use suitable size and strong boxes. Each box only has one die cutter, and the surface of the die cutter is covered with foam. The short shafts at both ends of the die cutter should be covered with wooden blocks with holes, which are fixed in the box to prevent the die cutter from shifting in the box during transportation. The outside of the box needs to be wrapped tightly, and the surface of the box must be marked with "wearable parts" to attract attention.
Second, storage
Choose a cool and dry place to store the die-cutting knife. In order to prevent the blade from being damaged, you can use a nylon brush to brush a thin layer of motor oil on and near the blade. When storing, it is best to use the box provided by the die cutter supplier to ensure that the blade does not contact any part or item in the box. The die cutter can be completely wrapped with foam plastic. The support blocks in the box must be supported on the short shafts at both ends of the die cutter, not on the blade.
3. Lifting and handling
When lifting and transporting in the workshop, cover the surface of the die cutter with a cloth to prevent the blade from being damaged. When installing other parts, it is necessary to prevent the parts from loosening and falling onto the die cutter, otherwise the die cutter will be seriously damaged.
Four, use and maintenance
When die cutting, remember to apply pressure evenly. A layer of wrap on the surface of the die cutter can reduce the impact, and you can also eject small pieces of shredded paper.
During the use process, we must keep abreast of the wear of the die cutter gear, and replace the gear in time if necessary. Because during processing, the manufacturer intentionally makes the hardness of the die cutter gear slightly lower than the hardness of the bottom anvil roller gear, so that the wear first occurs on the gear of the die cutter. This avoids frequent replacement of the bottom anvil roller gear, which is expensive and difficult to disassemble. This situation is very similar to the relative hardness relationship between the plate cylinder gear and the impression cylinder gear, because it is easier to replace the plate cylinder gear.
When using the die cutter, be sure to use the roll shoulder provided by the manufacturer to wipe the felt, and drip an appropriate amount of lubricating oil daily to keep the surface of the die cutter roll shoulder and the bottom anvil roll clean, and form a thin layer between the two The thin oil film improves the wear resistance of the die cutter roll shoulder and the bottom anvil roll surface.
5. Make a good record
It is necessary to develop the habit of making records, including the number of die-cutting, the date when the die-cutting knife is sent back to grinding, the condition of the paper that is die-cut at each work, and the use of metal ink when necessary. With reference to these records, you can know when you need to sharpen the die cutter in future production and when to order a new die cutter to avoid production delays or waste.
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