Paper properties that affect die cutting

Stable dimensions play a very important role in achieving a neat and repeatable die-cutting effect. Whether it is a single sheet of corrugated board or a roll of coated cardboard, the strength of the material can greatly affect the final product quality of the paper product. At the same time, the impact of the die-cutting tool on the final product will also have a greater impact, but to facilitate the discussion of the problem, it can be assumed that the die-cutting tool has no problem. In most cases, die-cutting tools and die-cutting operations require uniform paper properties.
At present, the industry has already considered pricing factors such as burst strength test and paper weight. Therefore, the compression test and crushing test have become important reference standards in the production and sale of paper products. The die-cutting process itself has very clear requirements for the paper properties. Crimping blank brown corrugated board may be minimally difficult, but the paper path and feed mechanism are still critical and maintain extremely high alignment accuracy throughout the die cutting process. The moisture content of the board must vary little or always remain constant.
The paper mill pays great attention to keeping the cardboard humidity constant. To this end, papermaking equipment is equipped with humidity control instruments. Humidity control at key locations such as cardboard edges is especially important. Corrugated board manufacturing equipment is also equipped with a humidity control device. Used to control the humidity of the corrugated edges and the adhesive moisture. The adhesive and the heating plate temperature are two important technical parameters in maintaining the final humidity. With the development of box making from single-faced corrugated board to double-sided and triple-layer, multi-layer corrugated boxes, paper humidity has become even more important. Paper properties, corrugated cardboard sheet bonding, and die-cutting processing have all been improved in complexity, and the processing quality is subject to some changes.
The efficiency of circular die-cutting is higher than that of flat-die die-cutting, which has a very good production and processing effect even when cardboards with different qualities are used. Due to the continuous feeding mode of circular die cutting, it is relatively easy to achieve job requirements in terms of alignment and registration. The effect of humidity changes on paper and corrugated cardboard sheets is relatively small. However, there are differences in strength, especially surface stability. Steel die-cutting tools produce more paper scraps, but less damage, because the steel die-cutting tools are strong and have greater impact on the paperboard.
The die-cutting tool made of synthetic material is theoretically very easy to break the paper, but the normal working time is longer when using 100% recycled paper board, and the paper scrap generated is also small, but the friction generated on the paper board bigger.
Coated paperboard and modern die-cutting The use of a soft plate in the pressure die-cutting and scissor-cutting operations results in die-cutting of the paperboard under pressure and subsequent separation of the live parts. This can greatly improve the degree of cleanliness and sharpness of the die-cutting work piece, making it easy for the next process to perform any type of creasing work. The selection of paperboard in the above-mentioned small batch die-cutting operations is of great importance for obtaining the best job quality.
Some coated paperboards, such as coated kraft linerboards, coated with white clay, are costly to recycle. The coating is applied directly to the paperboard using residential housing coatings such as titanium dioxide and latex. The substrate properties such as humidity and surface strength are strictly controlled before the coating treatment because these characteristics have a certain influence on the coating quality. The coating should be firmly attached to the substrate in order to avoid delamination, cracking, cracking, etc.
Unfortunately, papermakers are often under tremendous pressure to reduce costs, and often consider these expensive materials as targets for cost reduction. These pressures are often influenced by most companies in the industry, because the total material cost of paper manufacturers is less than 5% of the cost of all variable factors. As a result, paper product processors may be able to obtain paperboard with cheaper paint, but the risk is relatively large. Therefore, paper product processors should choose papermakers who pay more attention to coating quality.
Coating quality is the key The most common device used to produce folding cartons today is a narrow-format flexographic press equipped with a die-cut die-cutting device. That is, webs with a thickness of 12 to 25 pt (1 pt = 1/72 inch) have a narrower width. Coatings often contain polymers, which can extend the life of the die. Additional costs can be calculated and it is not difficult to recycle.
High-quality coatings can improve the quality of flexographic printing, which is not necessarily due to contrast, but because of the text's handleability and repeatability. Uneven surface variations on the paperboard caused by the use of low-cost paints can have an effect on the final product, causing spots on the surface, no gloss, or excessively high gloss, thereby reducing the quality of the work.
The last thing to mention is that according to the important paperboard characteristics, scissor-cut die-cutting is used in combination with pressure die-cutting in flat and round die-cutting operations. The cardboard is cut between the die cutter and the die roll with a smooth surface, hitting the die cutter, reducing the service life of the die. Coatings that prevent delamination, improve pattern reproduction quality, duplex coatings that are designed to extend the life of the die, and uniform moisture that helps improve the paper quality and register accuracy make scissor-cutting a face for papermakers The biggest challenge. (USA) Michael J. Dussi