Indentation technology of low weight and high strength micro corrugated

Low-gram weight, high-strength micro-corrugation is quietly entering the carton market in China. Many manufacturers have understood the benefits of low-gram high-strength micro-corrugation in replacing high-gram white cardboard in terms of cost and structural compressive strength. However, whether it is printing or post-processing, micro-corrugated paper is technically different from traditional white cardboard. Therefore, to truly allow micro-corrugation to enter the carton packaging industry in an all-round way, we must also understand and master these technical differences in order to make it enter the practical stage. Here are some brief presentations on the micro-corrugation indentation technology for the industry to discuss together.

The key word in replacing high-gram white cardboard with low-gram weight and high-strength micro-corrugated cardboard for packaging cartons is "precision folding." This is extremely important in the automatic gluing of post-processing and the automatic filling of the production line when the finished product is filled. Another key word is "the crease does not burst", which is also an important criterion for measuring the quality of the product.

In general, the indentation of corrugated cardboard is from the inside to the indentation, that is, when the indentation is die-cut with a flat-press flat die-cutting machine, the printing surface is down; and when the indentation is made with a flat-press flat die-cutting machine for white cardboard, it is from outside Inside pressure, that is, with the printed side facing up. Therefore, when the corrugated paper is indented, the inner paper (innerliner) is pushed outward into a dent, so when the box is folded, the outer paper (outliner) is stretched and tightened. This indentation method is at the adhesive point of corrugated core paper and facial paper along the corrugated pit line. The indentation line is easy to deviate to form irregularities (ie, the indentation line is not straight and the edges and corners are not clear). And the automatic loading line will cause adverse effects.

The white card paper indentation uses an indentation female template to form a convex circle on the inside of the cardboard. This convex round mark line causes the inner layer of the cardboard to form a layered peel along the two sides of the mark line. The inner layer peeling on both sides makes the folding of the rear lane very regular , Will not go off course.

When indenting micro-corrugations, the author believes that the same method as white cardboard should be used, and the printing side can be considered to be pressed from the outside to the inside, while using the indentation negative template. Although the micro corrugated paper will not form an inner layer peeling along both sides of the indentation line like white cardboard, the outer paper will form a single pit, while the inner paper will form parallel concave lines along both sides of the convex line and flatten The corrugated core paper in the pits of the mark line can make the folding of the back lane (along the indentation line) have a similar good effect as the cardboard indentation line. This kind of outer paper and inner paper have two parallel trace lines, and the corrugated core paper sandwiched and crushed in the middle can solve the problem of irregular trace lines caused by the corrugated core paper at the adhesive point.

In fact, in F, N micro-corrugated indentation, the indentation can be from outside to inside or from inside to outside, depending on the actual situation. In order to get a better indentation effect, it is recommended to use a flat-headed indentation line instead of the round-headed indentation line generally used for white cardboard indentation. This can reduce the micro-cracks on the indentation line, and it is these micro-cracks that can cause the cracks to burst when the box is folded.

Paper stretching is also one of the main reasons for the burst of the mark line during die cutting and indentation, mainly because of the uneven and excessive tensile force on the paper during die cutting and indentation. Because the micro corrugation is thicker, the indentation of the female template of the indentation is also deeper, and the tensile force on the facing paper during the indentation is greater, resulting in tiny cracks. This problem is more likely to occur if you use a bottom die strip that is quickly pasted, because the bottom die strip (Matrix) does not have a flat surface, and it is all round. It is easy to cause an uneven surface, and the pressure and tensile force on the paper are also uneven. Therefore, the selection of rubber (sponge) on the knife plate is very important. Put some non-porous sponges along the knife line (for specific specifications, please consult the material supplier), which will help eject the micro-corrugated die-cut in time and reduce scratches. And micro cracks.

In general, the indentation of micro-corrugation is to crush the corrugated core paper pit in the middle. Therefore, core paper and pits have a great influence on the quality of indentation. In the same version of the work, it is best to use the same corrugated line using the same core paper mini corrugated paper. In addition, by narrowing the width of the indentation groove and increasing the depth of the indentation, a good crease effect can also be obtained. However, this method has relatively high requirements for the selection of micro corrugated paper. All the indentation technical points mentioned above, when applied to the indentation of micro-corrugated paper, must go through experiments and be adjusted according to specific conditions to achieve the best results.

about the author

Zheng Hua, after graduating from university in 1983, joined Hong Kong Gao Hua Printing Equipment Co., Ltd. as a sales representative to engage in sales. Immigrated to Canada in 1988 and started PRINTECH EQUIPMENT INC. In 1989, manufacturing, selling and servicing postpress equipment in North America. In 1994, Anshun Machinery Manufacturing Co., Ltd. was established in Ruian, Zhejiang, China to produce semi-automatic die cutting machines and hot stamping machines. In 1997, he founded Shanghai Xuheng Ironwork Machinery Manufacturing Co., Ltd. as a sole proprietorship in Shanghai, and became one of the earliest enterprises in China to manufacture large-format automatic flat-bed die-cutting machines for the corrugated paper industry.

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