Post-press die-cutting tape technology that printing practitioners should know

With the development of various modern industries such as mobile phones, electronics, electrical appliances, etc., 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 on roll-shaped packaging. This kind of packaging The tape industry has also produced post-negative die-cut tape technology.

The die cutting process is the most commonly used process for packaging tape. It uses a die cutter to form a die cutting plate according to the pattern of product design requirements. Under the action of pressure, the tape or other plate blanks are rolled into the desired shape or Cutting process. The creasing process is to use a crimping knife or a crimping die to press the line marks on the sheet material through the action of pressure, or use the wire rolling wheel to roll out the line marks on the sheet material, so that the sheet material can be bent and formed at a predetermined position .

Generally, the die-cutting and creasing process is a process of combining die-cutting knives and crimping knives in the same template, and simultaneously performing die-cutting and indentation processing on the die-cutting machine, referred to as die-cutting. The main technological process of die-cutting forming is: upper version → adjusting the pressure → determining the distance → adhesive rubber strip → test pressure die-cutting → formal die-cutting forming → waste removal → finished product inspection → point packaging

Proofread the finished die-cut version, and roughly observe whether it meets the requirements of the design draft.

Whether the positions of the steel wire (crimping knife) and the steel knife (die cutting knife) are accurate; whether the slotted and holed cutting line adopts the entire line, and whether the curve of the line is rounded; for the convenience of cleaning, the adjacent narrow waste edge Whether the connection increases the connecting part to make it into one; whether there is a sharp corner at the joint of the two lines; whether there is a case where the sharp line ends at the middle paragraph of another straight line. Once the above problems occur in the die-cut version, the plate-making personnel should be notified to make corrections to avoid wasting more time. Then, install the fixed die-cut plate in the frame of the die-cutting machine, and adjust the position of the plate.

Adjust the pressure, determine the rules and paste the rubber bullet

To adjust the layout pressure, first adjust the pressure of the steel knife. After padding, start the machine and press several times to make the steel knife level, and then use a cardboard that is larger than the die-cut version of the board to test the pressure. According to the cut marks cut by the steel knife on the cardboard, use some or all to gradually increase the pressure or The method of reducing the number of backing paper layers makes the pressure of each knife line on the layout uniform.

In general, the steel line is 0.8mm lower than the knife line (because of the different corrugated cardboard corrugated type, the thickness of the cardboard has a large gap, it should be adjusted according to the actual situation). Adjust the pressure of the steel wire. The thickness of the backing paper is usually calculated according to the thickness of the die-cut cardboard, that is, the thickness of the backing paper = the height of the steel knife-the height of the steel wire-the thickness of the cardboard being die-cut.

The rubber bullet plug should be placed on the two sides of the main steel knife of the die-cut version, and the good recovery of the rubber bullet strip is used to push the separated cardboard out of the blade. Generally speaking, the rubber band should be about 1.2mm higher than the die cutting blade, and the distance between the rubber band and the knife line is 1mm ~ 2mm, because if installed only by the blade body, the rubber bullet cannot expand in the direction of the blade body after being compressed. It can expand in the other direction, causing the paper to be pulled to both sides. The die cutter has not cut the paper, and it has been pulled off by the rubber bullet, which is prone to produce paper wool.

Trial die cutting, formal die cutting, waste removal, finished product inspection, point packaging

After the above work is completed, the sample sheet should be cut out first, and a comprehensive inspection should be conducted to see if the indicators meet the requirements. After the full-time inspector signs and confirms, mass production can be carried out.

Of course, in the printing process, it is also very important for the operator. The operator should be skilled in this technology and should conduct self-checks frequently, mainly to compare with the proofs to see if there is a problem and solve it in time. The die-cut product should be stripped of excess edging, and then the burr edge should be polished to make it smooth and free of burrs. Afterwards, the finished products are selected and inspected to remove the defective products, and the final points, packaging, acceptance and storage. This thing should be done by the operator. As the industry develops, information technology will become more convenient and faster.

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