Every Die-hard Die-cutting--Awareness of Die-cutting Process (I)

With the improvement of people's living standards, packaging products will also be rapidly updated. The current cost of packaging products, especially some special shaped carton boxes, does not satisfy the market and users' changes in packaging requirements in accordance with ordinary production methods, making a huge contribution. At present, in the actual production of die-cut cartons, many carton companies have some technical problems that cannot be well controlled and solved, and thus cannot guarantee product quality and affect the economic efficiency of enterprises. In this issue, we invite all industry participants to express their opinions and discuss different aspects of die-cutting processes, problems arising, and trends in their technologies.

First, understanding die-cutting process

Die-cutting process is a process most commonly used for packaging printing. It uses a die-cutting knife to form a die-cutting plate according to the pattern of product design requirements. Under the effect of pressure, the printed material or other plate-shaped blanks are rolled into a desired shape or Cutting process. Indentation process is the use of knife or pressure line die, through the role of pressure on the sheet material extrusion line marks, or use the roller to roll out the line marks on the sheet material, so that the sheet material can be bent at a predetermined location .

Usually the die-cutting indentation process is a combination of a die cutter and a wire cutter in the same template, and the die-cutting machine is simultaneously subjected to a process of die-cutting and indentation processing, referred to as die-cutting.

Technology introduction

The main process of die-cutting indentation is:

Version - Adjusting Pressure - Determining Rules - Sticking Rubber Bands - Pressure Die-Cut Die Cutting - Formal Die-Cut Indentation - Stripping - Finished Product Inspection - Point Packaging

Upper edition

First, proofread the die-cut version that has been made, and roughly observe whether it meets the requirements of the design draft. Whether the position of the steel wire (knife) and steel knife (die cutter) is correct; whether the incision of the slotted hole adopts the whole line, and whether the line turns is rounded; for the sake of convenience, the adjacent narrow waste Whether the junctions of the edges increase the connection parts and make them connected together; whether there are sharp corners at the joints of the two lines; whether there is a case where the sharp corner line ends at the middle of another straight line. Once the above issues arise in the die-cut version, the plate-making personnel should be notified immediately to make corrections to avoid more time wastage. Then, the prepared die-cut version is installed and fixed in the plate of the die-cutting machine, and the position of the good version is initially adjusted.

Adjust pressure, determine rules and paste rubber plugs

Adjust the layout pressure, first adjust the pressure of the steel knife. After padding, first press the print several times to flatten the steel knife, and then use a cardboard larger than the die-cut layout to test the pressure. According to the marks cut by the steel knife on the paper board, gradually increase the pressure by using the partial or all. The method of reducing the number of backing paper layers makes the pressure of each cutting line of the layout uniform.

In general, the steel wire is 0.8mm lower than the knife line (because the corrugated paperboard has different types of corrugated paperboard, the thickness of the paperboard has a large gap and should be adjusted according to actual conditions). In order to obtain the ideal pressure for the steel wire and steel knife, it should be based on the die cutting. The nature of the cardboard adjusts the pressure of the steel wire. The thickness of the pad is usually calculated based on the thickness of the die-cut cardboard, that is, the thickness of the pad is the height of the two steel blades—the height of the steel wire—the thickness of the die-cut cardboard.

(Remarks: After the layout pressure is adjusted, fix the die plate. When determining the position of the rule, the die-cut product is generally the best center.)

The rubber plug should be placed on the two sides of the main steel knife of the die-cutting plate, and the separated cardboard should be pushed out from the edge using the good recoverability of the rubber elastic bar. In general, the rubber band should be about 1.2mm higher than the cutting edge, and the distance from the rubber line to the cutting line should be 1mm-2mm, because if it is only installed by the blade body, the rubber projectile cannot expand in the direction of the blade after being pressed. Can only expand in the other direction, resulting in pulling the paper on both sides, die cutting knife has not cut off the paper, has been broken by a rubber plug, easy to produce paper.

Pressure Die Cutting, Formal Die Cutting, Stripping, Finished Product Inspection, Point Packaging

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

During the production process, operators should perform self-tests from time to time. It mainly compares with sample proofs to see if there are any problems and solve them in time. The excess material should be removed from the die-cut product, and the burr edges should be polished to make it smooth and free from burrs. Afterwards, the finished product was selected for inspection, defective products were removed, and the final number, packaging, acceptance, and storage were completed.

(to be continued)