Many color box die-cutting factories often have a headache for the edge of the color box paper. Now, regarding the phenomenon of paper edge fluffing, dusting, etc., the causes and treatment methods of dividing the board are for reference by the peers.
The first is paper. We usually use high-quality virgin paper. Because of its longer fiber, it generally has less fluffing and dusting than recycled paper. Therefore, the original paper is not easy to fluff and dust. However, at this stage, most manufacturers need to reduce costs and promote environmental protection and recycling awareness, and more and more people prefer to use recycled paper. In this way, the demand for high-quality die-cutting materials is increasing, so as to solve the problem of fuzzing and dusting of die-cut paper edges.
So how to choose high-quality materials to solve the problem? First of all, high-quality die cutters should be used. In general high-end die cutting blades, we can observe with a magnifying glass that there are still many pores and defects, that is, it is not very slippery. This is one of the causes of paper dust. In particular, the die-cutting knife with straight-grain processing is very sharp on the surface, but in fact there are many flaws and the chance of dusting is the greatest. There is an Austrian BOHLER “Supreme Supreme Knife” on the market now. It uses a special metal coating to fill up pores and blemishes and make it slippery like a wall shake. This greatly reduces the generation of paper dust and is more suitable for Recycle paper. The friction between the knife and the paper edge is reduced, that is, the wear on the machine is reduced, and the knife itself is more durable. This kind of knife is most suitable for die-cut medicine boxes, cosmetic boxes, food boxes, cigarette boxes and other long-version products that require dust-free.
Another reason for die-cutting and fluffing of color boxes is that the matching and installation of die-cutting and sponge strips are not up to standard. Because the sponge glue should have enough hardness to press the paper tightly, so that the die cutter can cut the paper smoothly. Sponge glue of different hardness is used for different papers, and the placement and height are also very elegant. The standard installation and material selection are as follows:
The choice of rebound sponge rubber hardness:
1. If the distance between die cutters is less than 8mm, the sponge rubber should be 60°hardness.
2. If the distance between die cutters is >8mm, the sponge glue should be 25° (pit paper) or 35° (jammed paper) hardness.
3. If the distance between the die cutter and the network cable is <10mm, the hardness of the arched sponge rubber should be 70°; if it is >10mm, the hardness of the sponge rubber should be 35°.
4. The punching position of the die-cutting knife uses an arched rubber hard bottom of 70°Shore to protect the connection point from being broken.
The commonly used sponge glues are as follows:
35° Breathable Sponge: The compression rate is 35%, the number of die-cutting is 1,000,000 times, and the speed is 9000 times/hour. It is used for paper jam.
20° sealed arch sponge rubber: compression rate is 50%, die-cutting times is 250,000 times, speed is 7500 times/hour, used for corrugated paper.
60° solid rubber strip: used for narrow positions, such as the position between the die cutter and the distance <8mm.
70° arch-shaped rubber strip: used for the punching position of the die-cutting knife, and the position where the distance between the knife and the network line is less than 10mm.
Installation method of rebound sponge glue:
The sponge condition should be at least 1mm away from both sides of the die-cutting knife body, and cannot be installed close to the body. Otherwise, the sponge rubber strip cannot expand in the direction of the knife body after being compressed, but can only expand in the other direction, which will cause the paper to be pulled to both sides. , The die cutter has not had time to cut the paper all year round, and it has been pulled off by the sponge rubber, which will cause fluffing and paper dust. In addition, the sponge rubber should be about 1.2mm higher than the blade edge, and adjust appropriately depending on the hardness. If the hardness is greater than 35° Shore, it should be less than 1.2mm, if the hardness is less than 35° Shore, it should be greater than 1.2mm. In principle, the softer the sponge, the higher the height. The correct height of the sponge glue can make wood samples faster.
On the entire wooden mold, the quantity, hardness and height of the sponge glue should be evenly distributed at each position, and sponge glue should be arranged on both sides of the balance knife.