Application of Self-adhesive Bottom Die in Carton Indentation Process

Keywords: self-adhesive strips carton indentation process steel wire With the continuous deepening of reform and opening up, China's market economy has been rapid development, the application of a variety of exquisite packaging carton more and more widely, some new materials should also be shipped Health. For example, in the carton processing indentation process, the use of self-adhesive bottom molds as an advanced auxiliary material will greatly improve the overall quality of carton products.
The self-adhesive bottom mold strip is a kind of auxiliary material used in the die cutting indentation process to replace the traditional bottom mold. Overseas as early as 40 years ago, it has developed and produced bottom mold strips. For example, British CHANNEL Corporation developed self-adhesive bottom mold strips in the 1950s and successively introduced high-elasticity stainless steel sheet bottom sheets, high-strength plastic sheet bottom sheets, and fiber paper base sheet self-adhesive bottom mold sheets, all over the world. It has been widely used. Table 1 shows the comparison of the effects of using a British CHANNEL self-adhesive undermold strip and a conventional process to make a die-cut indentation bottom mold.
Table 1 Comparison of the effects of using UK CHANNEL self-adhesive undermold strips and traditional craftsmanship to make die-cutting indentations

The comparison project adopts traditional technology and adopts self-adhesive bottom mold strip. The work efficiency is low. The production time of the bottom mold is long and the working time is high. The civil time can be shortened by 80%. The production convenience is high when the production technology is used. The bottom mold strip is easy to use. No need for special skill positioning Accuracy The position of the indentation die groove and indentation tool is not necessarily accurate. Position of the bottom mold is absolutely accurate, and the precision of the die groove is not easy. The width and depth of the die groove are not easy to accurately meet the indentation requirements - Irregular indentation is easy to occur. Crack lines and cracks at the creases etc. Defects in the width and depth of the die cavity Width and depth depend on the thickness of the cardboard. Scientific settings ensure perfect indentation. Use stability. Need to adjust the indentation performance Indentation effect is not stable, affect product quality, easy to produce waste indentation effect when paste box is consistent, is to ensure the production of high quality products

In China, with the accelerating pace of opening up to the outside world, some domestic trading companies started to sell, sell and promote self-adhesive bottom molds in the early 1990s. In just a decade, the use of self-adhesive undermolds has reached 95% in some cities where the printing industry is developed.
How to use the bottom mold bar 1. Select the normal bottom mold groove width and groove depth.
Groove width = 2 sheets of paper thickness + steel wire thickness (Â±0.05mm)
Groove depth = paper thickness (Â±0.05mm)
Steel wire height = steel blade height - paper thickness 2. Adjust the pressure of the entire bottom plate of the die-cut creaser.
3. Cut the bottom mold strips of corresponding length according to the length of the steel wire on the die mold, and insert the surface openings of the bottom mold strips into the steel wire. The protective film of the bottom mold strip is peeled off; then, the bottom mold strip is firmly stuck on the bottom board of the machine; the bottom mold strip positioning glue strip on the bottom board is taken off, and the bottom wire pressure line bottom mold is formed accordingly. Start working properly.
There are many printing companies that use recycled paper for cost savings. Due to the short fibers and sparse density of the recycled paper, explosive lines, popping colors, etc. are easily generated in the process of die-cutting and indentation. British CHANNEL Corporation has developed a beveled self-adhesive bottom mold strip for the use of inclined surfaces to make recycled paper fibers. Indentation avoids breakage at right angles of 90Â°, reducing waste and improving efficiency. Table 2 gives an analysis of the indentation failure.
Table 2 Indentation failure analysis

PROBLEM POSSIBLE CAUSES SOLUTION THE APPROACH TO THE SOLUTION Cracks in the middle of the crease line are too high. Use a lower wire crease. Cracks occur on one side. The steel wire is not exactly in the middle of the groove. 1. For manual engraving: Groove cutting with a knife;
2. If the strip indentation bottom mold: replace the pressure line die;
3. If the entire counter is: Reposition, use a wider groove or replace the bottom mold. Crevices on both sides of creases Counterslot Grooves are too narrow Grooves Wide undercuts Indentation is not noticeable Steel wire is too low or counterbored Groove is too wide Use make-up paper to increase wire height, or use grooves Narrow bottom mold creases unevenly on the reverse side. Steel wire is too low. Use make-up paper to increase the height of steel wire. Indentation on poor quality paperboard is not obvious The bottom mold groove is too shallow. Positioning strip is not easy to install on steel wire Steel wire is too old (rusty or broken); Positioning rubber strip is not properly replaced Replace steel wire, wipe with oil or wax to make wire smoother, Use groove for wider positioning The strips are not easy to stick to the surface of the die cutting machine. The surface of the die cutting machine has dirty oil marks on the bottom surface. The bottom plate is completely cleaned. The indentation marks appear at the end of the stamp (when the bottom die is near the cutting position of the steel knife, Situation) Excessive indentation pressure reduces the height of the elastic rubber on the blade or cuts the end of the die into a ramp shape

It is the use of bottom mold strips as an auxiliary material that has greatly improved the quality of many companies' products. It is believed that this new type of auxiliary material with low cost and significant effect will be more and more widely used in China. (Zhang Entao, Shanghai Leopard Printing Materials Co., Ltd.) ("Printing Magazine")

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