How to solve the problem that the edge of the long

How to solve the problem that the edge of the longitudinal indentation line of the lining paper always bursts

release date: Source: China printing carton color box browse times: 2573 copyright and disclaimer

core tip: Introduction: die cutting indentation is an important production process for the post press processing of carton and carton products. How about the process effect of die cutting indentation? It is impossible to measure the length of the spring, which only affects the production efficiency, It also affects the product introduction: die cutting indentation is an important production process for post press processing of carton and carton products. The effect of die cutting indentation not only affects the production efficiency, but also affects the product quality and use effect. Therefore, it is of great significance to effectively control the quality of cartons and carton products and improve production efficiency to control the die cutting and indentation technology

1. Case: the edge of the longitudinal indentation line of the lining paper is always burst

the main process flow of die cutting indentation is: making die cutting plate, loading plate, adjusting pressure (including pad and paste), correcting plate (including adjusting rules), pasting sponge, indentation groove, pressure test die cutting sample, formal die cutting, waste removal, finished product inspection, molding, inspection, packaging and other operating procedures

when the machine, die-cutting plate, corrugated board thickness and die-cutting pressure are unchanged, the shear test results of solder joints in the middle of production are converted to another kind of paperboard for die-cutting, the edge of the longitudinal indentation line (parallel to the corrugated) of the layout often bursts, and the bursting cracks are all in the inner paper layer. What's going on

in this case, the paper in the box is usually cardboard or pickup truck, and the carton is the packaging of low-grade products. Considering the production cost and maintaining appropriate packaging, the paper layer in the carton is corrugated paper

due to the fact that the toughness of corrugated paper is obviously inferior to that of box board paper and ox card. In this way, the length of cracks is irregular, generally ranging from 30 to 80mm. In this regard, if the die-cutting pressure is reduced or the indentation groove on the iron plate is removed, the indentation line will not be clear enough, which will not only affect the rapid prototyping when pasting the box, but also prone to deflection, and the product quality effect and production efficiency will be adversely affected

2. Cause analysis and solutions

in view of this situation, how to make reasonable changes? If the deformation is too large, replace the new belt; Why loosen the fixing screws of the motor? After careful observation and analysis, it is believed that there are two main reasons for the bursting of the corrugated board after indentation

first, this kind of lining paper has poor fiber toughness and strength, and the paper is brittle; Second, the corrugated board has a certain thickness, which is caused by the small "sinking" surface of the inner paper when the indentation is made

because the corrugated board is placed on the pressing plate during indentation, the distance between the inner paper mounted on the top of the corrugated board and the surface of the pressing plate is about 3.5mm, and the inner paper layer is almost "suspended"; Then, when the machine is pressed, the inner paper part corresponding to the indentation knife will appear linear sinking deformation after being pressed. The smaller the "sinking" surface of the lining paper, the easier it is to crack its edge. This can also be inspired by the principle of cutting things with a knife. For example, the thinner the blade, the easier it is to cut things

after analyzing the cause, paste a sponge with a width of about 8mm and a length corresponding to the indentation knife on both sides of the indentation knife on the die-cutting plate corresponding to the burst mark, and the height of the sponge is flush with the indentation knife. In this way, after the die-cutting plate is pasted with sponge strips, when pressing, the die-cutting knife and the sponges on both sides will press down the corrugated board at the same time. Because the "sinking" surface of the inner paper is large, the edge of the cardboard indentation line generally will not burst, which better ensures the die-cutting quality of carton products