Many color box die-cutting factories often have a headache for the fluff of the color box paper. For the phenomenon of fluffing and dusting on the paper edge, the reasons and processing methods of the sub-boards are for your peers' reference.
The first is paper. We usually use high-quality virgin paper. Because the fiber is longer, it generally has less fluff and dust than recycled paper. Therefore, it is not easy to fluff and dust with original paper. But at this stage, most manufacturers need to reduce costs and promote environmental recycling awareness, more and more people like to use recycled paper. In this way, there is an increasing demand for high-quality die-cut materials, thereby solving the problems of fluffing 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 selected. On the general high-end die-cutting blades, we can use the magnifying glass to observe that there are still many air holes and defects, that is, it is not very slippery. This is one of the causes of paper dust. Especially the straight-cut die cutters are sharp on the surface, but in fact there are many flaws and the chance of dusting is the greatest. There is now an Austrian BOHLER "Supreme Supreme Knife" on the market, which uses a special metal coating to fill up the air holes and flaws like a wall, smoothing and batching. 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 cutting medicine box, cosmetic box, food box, cigarette box and other long version and requires dust-free products.
Another reason for die-cutting and fluffing of color boxes is that the matching and installation of die-cutting and sponge strips are out of specification. Sponge glue should have enough hardness to press the paper tightly, so that the die cutter can cut the paper smoothly. Sponge glue with different hardness is used for different papers, and the placement position and height are also very elegant. The standard installation and material selection are as follows:
Selection of rebound sponge hardness:
1. If the distance between the die-cutting knives is <8mm, the sponge should have a hardness of 60 °.
2. If the distance between the die-cutting knives is> 8mm, the sponge glue should be 25 ° (pit paper) or 35 ° (paper jam) hardness.
3. If the distance between the die cutter and the wire is <10mm, the hardness of the arch sponge should be 70 °; if it is> 10mm, the hardness of the sponge should be 35 °.
4. 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 rubber: compression rate is 35%, die cutting times are 1,000,000 times, speed is 9000 times / hour, used for paper jam.
20 ° sealed arch sponge: 50% compression rate, 250,000 die cutting times, 7500 times / hour, used for corrugated paper.
60 ° solid type adhesive tape: used in narrow position, such as the position where the distance between die cutters is less than 8mm.
70 ° arch type rubber strip: used for the die cutting knife punching position, and the distance between the knife and the wire <10mm.
Installation method of rebound sponge:
The sponge condition should be at least 1mm away from both sides of the die-cutting blade body, and cannot be installed close to the body, otherwise, the sponge rubber strip cannot expand in the direction of the blade body after being compressed, and can only expand in the other direction, which causes paper to be pulled to both sides In addition, the die cutter can cut the paper for the whole year, and it has been pulled off by the sponge, which will cause fluff and paper dust. In addition, the sponge rubber should be about 1.2mm higher than the blade edge, depending on the hardness of the appropriate adjustment. If the hardness is> 35 ° Shore, it should be <1.2mm, if the hardness is <35 ° Shore, it should be> 1.2mm. In principle, the softer the sponge glue, the higher the height. The correct height of the sponge glue can make the wood sample faster.
On the whole wooden mold, the quantity, hardness and height of sponge glue should be evenly distributed in various positions, and sponge glue should also be arranged on both sides of the balancing knife.
