Indentation technology of the most popular low gra

2022-08-06
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Indentation technology of low gram weight and high strength micro corrugated low gram weight and high strength micro corrugated are quietly entering the carton Market in China. Many operators have understood the advantages of low gram weight and high strength micro corrugated replacing high gram weight white cardboard in terms of cost and structural compressive strength. However, the micro corrugated paper is different from the traditional white card paper in terms of technology, whether in printing or after processing. Therefore, in order to truly make micro corrugated enter the carton packaging industry in an all-round way, we must understand and master these technical differences in order to make it enter the practical stage. This paper makes some brief statements on the indentation technology of micro corrugated for the discussion of the industry

the key word of using low gram weight high-strength micro corrugated board to replace high gram weight white cardboard as packaging carton is precise folding. This is very important in the automatic box pasting of post-processing and in the automatic loading line when loading finished products. Another key word is that the crease does not burst, which is also an important standard to measure product quality

generally, the indentation of corrugated board is to press the dent from the inside to the outside, that is, when the indentation die is cut with the flat die-cutting machine, the printing face is downward; When the white cardboard is pressed with the die-cutting machine, it is pressed from the outside to the inside, that is, the printing face is up. Therefore, when the corrugated paper is indented, the innerliner is pushed outward to form a dent, so when folding the box, the outer paper is stretched and tightened. In this way, at the bonding point of corrugated core paper and face paper along the corrugated pit line, the indentation line is easy to deviate and form irregularities (i.e. the indentation line is not straight, and the edges and corners are not clear), which has an adverse impact on the rear paste box and the upper automatic filling line

white cardboard indentation is loaded with pretension at the same time, and then the extensometer is added); The indentation negative template is used to save the cost as much as possible to form a convex circle on the inner side of the cardboard. This convex circle mark line causes the delamination of the inner layer of the cardboard along both sides of the mark line. The inner layer stripping on both sides makes the folding of the back track very regular and will not deviate

the author thinks that the same way as the white card should be used in the indentation micro corrugation. The printing face should be upward, pressing from the outside to the inside, and the indentation female template should be used at the same time. Although the micro corrugation will not form the inner layer peeling along both sides of the indentation line after the indentation like the white cardboard, the outer paper will form a single concave, while the inner paper will form parallel concave lines along both sides of the convex line and flatten the corrugated core paper in the indentation line. This can make the folding of the back path (along the indentation line) have a good effect similar to that of the cardboard indentation line. The outer paper has one parallel mark line with the inner paper, and the corrugated core paper wrapped in the middle is flattened, which can solve the problem of irregular mark line caused by the corrugated core paper at the adhesive point

in fact, in the case of F and N micro corrugated indentation, it can be either from the outside to the inside or from the inside to the outside, depending on the actual situation. In order to get better indentation effect, it is recommended to use flat head indentation line instead of round head indentation line commonly used for white cardboard indentation. This can reduce the fine cracks on the indentation line, which can cause the crack of the indentation line when folding the box

paper stretching is also one of the main reasons for the crack of the marking line during die cutting and indentation, which is mainly caused by uneven and excessive tension on the paper during die cutting and indentation. Due to the thick micro corrugation, the indentation negative template pit is also deeper. During the indentation, the tensile force caused by the opposite paper is greater, resulting in small cracks. If you use the quick pasted bottom mold strip, this problem is more likely to occur, because the bottom mold strip (matrix) has no plane and is full of circular surfaces, which is easy to cause uneven surfaces and uneven pressure and tensile force on the paper. Therefore, the selection of rubber (sponge) on the blade plate is very important. Placing some non porous sponges along the blade line (ask the material supplier for specific specifications) is helpful to pop up the micro corrugated after die cutting in time and reduce scratches and micro cracks

generally speaking, the indentation of micro corrugated is to flatten the corrugated core paper pit in the middle. Therefore, the core paper and pit have a great impact on the indentation quality due to the progress of core technology. In the same version, it is better to use the micro corrugated paper with the same roll of core paper from the same corrugated line. In addition, by narrowing the indentation (3), this method is of great significance for similar products. The indentation groove width can be increased, and a good crease effect can be obtained by increasing the indentation depth. However, this method has high requirements for the selection of micro corrugated paper. All the above mentioned key points of indentation technology, when applied to micro corrugated paper indentation, should be tested and adjusted according to specific conditions to achieve the best effect

the author introduces

Zheng Hua, who joined Hong Kong Gaohua printing equipment Co., Ltd. as a sales representative after graduating from university in 1983. In 1988, he immigrated to Canada, and in 1989, he started to operate printech Equipment Inc., which manufactures, sells and serves post press equipment in North America. In 1994, Anshun Machinery Manufacturing Co., Ltd., a joint venture company, was established in Ruian, Zhejiang, China to produce semi-automatic die-cutting machines and bronzing machines. In 1997, Shanghai Xuheng iron machinery manufacturing Co., Ltd. was founded in Shanghai, becoming one of the first enterprises in China to manufacture large format automatic flat pressing and die-cutting machines for the corrugated paper industry

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