With the development of various modern industries such as mobile phones, electronics, and electrical appliances, the packaging tape industry has also emerged with the special requirements of these industries. It is mainly used for various types of precision die-cut tapes in the packaging of coil shapes. This packaging tape industry has also produced negative post-die-cut tape technology accordingly.
The die-cutting process is the most commonly used process for packaging tapes. It is a molding process that uses a die-cutting knife to combine a die-cutting plate according to the pattern required by the product design, and under the action of pressure, the tape or other plate-shaped blanks are rolled into the required shape or cut marks. The creasing process uses a creasing knife or a creasing die to press out a line mark on the sheet through the action of pressure, or uses a rolling wheel to roll out a line mark on the sheet so that the sheet can be bent and formed according to the predetermined position.
Usually, the die-cutting and creasing process is a process in which the die-cutting knife and the creasing knife are combined in the same template, and die-cutting and creasing processing are performed simultaneously on the die-cutting machine, which is referred to as die-cutting. The main process of die-cutting is: plate loading → pressure adjustment → distance determination → rubber strip pasting → test die-cutting → formal die-cutting → waste removal → finished product inspection → count and packing.
Proofread the finished die-cutting plate and roughly observe whether it meets the requirements of the design draft.
Whether the position of the steel wire (crimping knife) and the steel knife (die-cutting knife) is accurate; whether the knife line for slotting and opening is a whole line, and whether the line turning point is rounded; in order to facilitate waste removal, whether the connection of adjacent narrow waste edges increases the connection part to make it connected into one piece; whether there is a sharp corner at the joint of the two lines; whether there is a situation where the sharp corner line ends at the middle section of another straight line, etc. Once the above problems occur in the die-cutting plate, the plate maker should be notified immediately to make corrections to avoid more time waste. Then, install and fix the made die-cutting plate in the plate frame of the die-cutting machine, and preliminarily adjust the position of the plate.
Adjust pressure, determine rules and paste rubber plugs
To adjust the plate pressure, first adjust the pressure of the steel knife. After padding, start the machine and press for several times to flatten the steel blade, then use a cardboard larger than the die-cutting plate to test the pressure. According to the cuts made by the steel blade on the cardboard, use the method of gradually increasing the pressure or reducing the number of backing paper layers locally or completely to make the pressure of each knife line on the plate uniform.
Generally, the steel wire is 0.8mm lower than the knife line (because of the different corrugated cardboard flute types, the thickness of the cardboard varies greatly, and it should be adjusted according to the actual situation). In order to make both the steel wire and the steel blade obtain the ideal pressure, the pressure of the steel wire should be adjusted according to the properties of the die-cutting cardboard. The thickness of the padding paper is usually calculated according to the thickness of the die-cutting cardboard, that is, the thickness of the padding paper = steel blade height - steel wire height - thickness of the die-cutting cardboard.
The rubber spring plug should be placed on the base on both sides of the main steel blade of the die-cutting plate, and the separated cardboard should be pushed out from the edge by the good recovery of the rubber spring strip. Generally speaking, the rubber strip should be about 1.2mm higher than the die-cutting blade, and the distance between the rubber strip and the knife line should be 1mm to 2mm. If it is installed only by the blade body, the rubber spring plug cannot expand toward the blade body after being compressed, but can only expand in the other direction, causing the paper to be pulled to both sides. The die-cutting knife has not cut the paper yet, but it has been pulled apart by the rubber spring plug, which is easy to produce paper hair.
