Despite the rapid development of the drum die-cut corrugated box industry, a considerable number of corrugated cartons are still processed by lithographic die-cutting. Even in large carton factories that have drum die-cutting machines, there are also flat-plate die cutters working to meet some of the printing needs. Requirements are particularly high, die-cutting requirements are particularly high, indentation requirements are particularly high, or shorter version of the order (Figure 1 omitted). Although the speed and throughput of lithographic die cutting is far less than that of cylinder die cutting, the quality of the flat carton is unmatched by the drum carton in terms of the exquisite degree of indentation and precision. However, it is not easy for the lithographic die-cut cartons to achieve the quality required by the market. If the necessary die-cutting processes are neglected, there will be many problems such as incomplete die-cutting, indentation, bursting, fluffing, shutdown, etc. Problems, losing the significance of lithographic die-cutting.
How to ensure smooth die cutting? The use of excellent die-cut materials and their mutual compatibility make it an important guarantee for die-cut quality of flat-plate carton. There are three types of die-cutting materials that directly affect the die-cut quality of the lithographic corrugated carton, namely "indentation bottom mold", "die cutter" and "rebound sponge glue".
IK-type bottom mold indentation line to perfect indentation protection Traditional etched corrugated paper in the die-cutting, the bottom mold is mostly made by the operator with a knife on the fiber paper scribe (so called "hand border line"), the practice is very backward, efficiency Low and inaccurate; the cardboard boxes die-cutting are usually of poor quality, such as inhomogeneous indentation, cracks, triangular marks, inconspicuousness, etc. Even the mid-range products are not considered to be difficult to compete in increasingly fierce competition; and Relying on the "master with apprentice" approach to skills transfer is not conducive to the rapid promotion of technology. In some of the more backward factories, any model is not used, and there is no sign of indentation at all.
The indentation system pioneered by CITO in Germany triggered a revolution in the mold material. At present, CITO indentation lines are widely used in more than 100 countries. In China, especially in Hong Kong, Guangdong, Shanghai, Jiangsu, Zhejiang, Sichuan, Beijing, Tianjin, Yunnan, and other places with high requirements for packaging, printing and packaging plants have also adopted the West line indentation line. How to choose the appropriate bottom mold indentation line thickness and width? (Figure 2 omitted) First measured flattened corrugated paper thickness e (set to 1.0mm), which can choose the thickness of the indentation line A, that is, A ≥ 1.0mm (if the paper toughness is poor, select A ≤ 1.0 Mm), then press the formula (ex 2) + d to get the indent line width B, ie: B=(1.0 x 2.0)+ 1.0 = 3.0 mm. According to the calculation, the size of the indentation line should be 1.0 x 3.0 mm.
However, why do some users reflect that the use of a common type of bottom mold indentation line, specifications and selection are also correct, and there will still be indentation burst phenomenon? The main reason is that the thickness of corrugated paper is much larger than that of paper jam. In fact, the surface of corrugated paper is actually weaker than paper jam. When it is under pressure from the right-angle edge of the bottom mold, it is easy to burst, and the surface is torn apart and exposed. It is very ugly. , The carton strength and crease toughness are greatly reduced.
In response to this phenomenon, Xituo Company's original IK-type corrugated paper special bottom mold indentation line provides effective protection for the appearance and toughness of corrugated paper indentation (Figure 3). According to the test statistics, after the use of type IK, the indentation quality has been significantly improved, and the chance of bursting has decreased by 90% compared with the previous. The waste product rate is further reduced and the production efficiency is further improved. There are die-cut corrugated lithographic step manufacturers, have problems such as detonating cord or the like can not find reasons, may wish to try IK type.
The selection of die cutters controls dusting and filamentation. With the rising global environmental protection demand, the application of recycled paper in the packaging industry will become more and more widespread. The paper dust produced by the papermaking in die-cutting is much more than the original paper. Especially in food packaging, hygiene products, medical supplies packaging, paper dust must be controlled within certain limits. Under the premise that the paper has been selected, the use of a suitable die cutter and rebound sponge glue can effectively reduce die cutting dust. Even on the blade of a general high-grade die cutter, if it is observed with a magnifying glass, there are still a lot of pores and rough surfaces, that is, not smooth, which is one of the reasons for the generation of paper dust. Austrian company Bohler offers a “Supreme Extreme Knife†(figure 4), which uses special metallic paint to fill the pores and rough surface like a lot of wall paint, achieving excellent smoothness. This effectively reduces the generation of paper dust. Because the friction between the blade and the paper edge is reduced, the knife itself is more durable and longer.
"Silking" is also a phenomenon that often occurs in die-cutting. One of the reasons is that the die-cutting blade can not withstand the larger die-cutting pressure. The blade edge has become dulled at the beginning of die-cutting. The subsequent die-cutting is actually "Break off" rather than "cut off", the blunt surface of the blade pushes the wire out of the paper. This phenomenon is more likely to occur when the surface of the paper is overcoated with a coating oil. The first method of improvement is to scientifically adjust the die-cutting pressure to prevent excessive pressure, and then use a die cutter with a special hardened blade front, such as the Universal series. If it is still not effective, it is recommended to use a higher-grade “Super Supreme Stabilo Knife†(figure 5). This knife is processed with a more elaborate blade to make it introverted and its blade is more resistant than other blade models. Several times higher, it can effectively prevent the occurrence of silking.
Another reason for rebound dusting, fluffing, and die cutting speed is the rebound rubber material, specifications and installation position is not reasonable, such as when a certain position of the sponge lacks sufficient hardness and elasticity, In this position, the paper cannot be pressed, and the phenomenon of tearing the paper occurs when cutting, rather than ideally cutting completely, so that paper dust and paper hair are produced. For example, if sponge rubber lacks resilience, it will affect the speed of the die cutting machine, resulting in frequent shutdown and troubleshooting. Therefore, in the modern die-cutting material application technology, the rebound sponge position is almost equal to other die-cutting consumables. Sponge rubber plays an important role in rebounding waste edges, positioning cartons, coordinating die-cutting indentations, protecting connecting points, and equalizing pressure. In order to ensure smooth and high-speed die-cutting and reduce paper dust and paper hair, it is necessary to use sponge glue with a uniform texture and proper hardness in combination with a high-quality die cutter and a bottom die system, which are really interlocking and indispensable.
Some manufacturers even use inferior "slipper glue" on automatic die-cutting machines, completely losing the significance of buying automatic die-cutting machines. Some manufacturers do not hesitate to purchase high-end equipment, but forget that good horses must be equipped with saddles. When they purchase materials, they prefer to use lower grades, which violates the original intention of the investment and its name is “lower production costâ€. This is a cart before the horse. It is a wrong way of production management. On the other hand, if the die-cutting machine is of a good grade and a good die-cut material is used, some deficiency of the die-cutting machine itself can be compensated.
The common sponge glue used for die-cut corrugated paper is the following:
250 Sealed Sponge Rubber:
Performance: 250,000 die cuts, 7500 rebounds/hour.
Specifications: 11×10×1000mm (board thickness 15mm).
Function: Quickly rebound the paper, increase the cutting speed, reduce the pressure on the paper, and make the paper transport smoothly.
Position: Die cutter on both sides, 2mm from the knife, 1.2mm higher than the blade.
250 Sealed Arch Sponge Rubber:
Performance: 250,000 die cuts, 7500 rebounds/hour.
Specifications: 12×13×25000mm (board thickness 15mm).
Function: Eliminates jams, protects the position of the mouth, makes paper transport faster, and reduces paper dust and debris.
Location: Open position and all parts, 1.2mm above the blade. (Hongye Equipment Co., Ltd. Lu Xiangqian)
How to ensure smooth die cutting? The use of excellent die-cut materials and their mutual compatibility make it an important guarantee for die-cut quality of flat-plate carton. There are three types of die-cutting materials that directly affect the die-cut quality of the lithographic corrugated carton, namely "indentation bottom mold", "die cutter" and "rebound sponge glue".
IK-type bottom mold indentation line to perfect indentation protection Traditional etched corrugated paper in the die-cutting, the bottom mold is mostly made by the operator with a knife on the fiber paper scribe (so called "hand border line"), the practice is very backward, efficiency Low and inaccurate; the cardboard boxes die-cutting are usually of poor quality, such as inhomogeneous indentation, cracks, triangular marks, inconspicuousness, etc. Even the mid-range products are not considered to be difficult to compete in increasingly fierce competition; and Relying on the "master with apprentice" approach to skills transfer is not conducive to the rapid promotion of technology. In some of the more backward factories, any model is not used, and there is no sign of indentation at all.
The indentation system pioneered by CITO in Germany triggered a revolution in the mold material. At present, CITO indentation lines are widely used in more than 100 countries. In China, especially in Hong Kong, Guangdong, Shanghai, Jiangsu, Zhejiang, Sichuan, Beijing, Tianjin, Yunnan, and other places with high requirements for packaging, printing and packaging plants have also adopted the West line indentation line. How to choose the appropriate bottom mold indentation line thickness and width? (Figure 2 omitted) First measured flattened corrugated paper thickness e (set to 1.0mm), which can choose the thickness of the indentation line A, that is, A ≥ 1.0mm (if the paper toughness is poor, select A ≤ 1.0 Mm), then press the formula (ex 2) + d to get the indent line width B, ie: B=(1.0 x 2.0)+ 1.0 = 3.0 mm. According to the calculation, the size of the indentation line should be 1.0 x 3.0 mm.
However, why do some users reflect that the use of a common type of bottom mold indentation line, specifications and selection are also correct, and there will still be indentation burst phenomenon? The main reason is that the thickness of corrugated paper is much larger than that of paper jam. In fact, the surface of corrugated paper is actually weaker than paper jam. When it is under pressure from the right-angle edge of the bottom mold, it is easy to burst, and the surface is torn apart and exposed. It is very ugly. , The carton strength and crease toughness are greatly reduced.
In response to this phenomenon, Xituo Company's original IK-type corrugated paper special bottom mold indentation line provides effective protection for the appearance and toughness of corrugated paper indentation (Figure 3). According to the test statistics, after the use of type IK, the indentation quality has been significantly improved, and the chance of bursting has decreased by 90% compared with the previous. The waste product rate is further reduced and the production efficiency is further improved. There are die-cut corrugated lithographic step manufacturers, have problems such as detonating cord or the like can not find reasons, may wish to try IK type.
The selection of die cutters controls dusting and filamentation. With the rising global environmental protection demand, the application of recycled paper in the packaging industry will become more and more widespread. The paper dust produced by the papermaking in die-cutting is much more than the original paper. Especially in food packaging, hygiene products, medical supplies packaging, paper dust must be controlled within certain limits. Under the premise that the paper has been selected, the use of a suitable die cutter and rebound sponge glue can effectively reduce die cutting dust. Even on the blade of a general high-grade die cutter, if it is observed with a magnifying glass, there are still a lot of pores and rough surfaces, that is, not smooth, which is one of the reasons for the generation of paper dust. Austrian company Bohler offers a “Supreme Extreme Knife†(figure 4), which uses special metallic paint to fill the pores and rough surface like a lot of wall paint, achieving excellent smoothness. This effectively reduces the generation of paper dust. Because the friction between the blade and the paper edge is reduced, the knife itself is more durable and longer.
"Silking" is also a phenomenon that often occurs in die-cutting. One of the reasons is that the die-cutting blade can not withstand the larger die-cutting pressure. The blade edge has become dulled at the beginning of die-cutting. The subsequent die-cutting is actually "Break off" rather than "cut off", the blunt surface of the blade pushes the wire out of the paper. This phenomenon is more likely to occur when the surface of the paper is overcoated with a coating oil. The first method of improvement is to scientifically adjust the die-cutting pressure to prevent excessive pressure, and then use a die cutter with a special hardened blade front, such as the Universal series. If it is still not effective, it is recommended to use a higher-grade “Super Supreme Stabilo Knife†(figure 5). This knife is processed with a more elaborate blade to make it introverted and its blade is more resistant than other blade models. Several times higher, it can effectively prevent the occurrence of silking.
Another reason for rebound dusting, fluffing, and die cutting speed is the rebound rubber material, specifications and installation position is not reasonable, such as when a certain position of the sponge lacks sufficient hardness and elasticity, In this position, the paper cannot be pressed, and the phenomenon of tearing the paper occurs when cutting, rather than ideally cutting completely, so that paper dust and paper hair are produced. For example, if sponge rubber lacks resilience, it will affect the speed of the die cutting machine, resulting in frequent shutdown and troubleshooting. Therefore, in the modern die-cutting material application technology, the rebound sponge position is almost equal to other die-cutting consumables. Sponge rubber plays an important role in rebounding waste edges, positioning cartons, coordinating die-cutting indentations, protecting connecting points, and equalizing pressure. In order to ensure smooth and high-speed die-cutting and reduce paper dust and paper hair, it is necessary to use sponge glue with a uniform texture and proper hardness in combination with a high-quality die cutter and a bottom die system, which are really interlocking and indispensable.
Some manufacturers even use inferior "slipper glue" on automatic die-cutting machines, completely losing the significance of buying automatic die-cutting machines. Some manufacturers do not hesitate to purchase high-end equipment, but forget that good horses must be equipped with saddles. When they purchase materials, they prefer to use lower grades, which violates the original intention of the investment and its name is “lower production costâ€. This is a cart before the horse. It is a wrong way of production management. On the other hand, if the die-cutting machine is of a good grade and a good die-cut material is used, some deficiency of the die-cutting machine itself can be compensated.
The common sponge glue used for die-cut corrugated paper is the following:
250 Sealed Sponge Rubber:
Performance: 250,000 die cuts, 7500 rebounds/hour.
Specifications: 11×10×1000mm (board thickness 15mm).
Function: Quickly rebound the paper, increase the cutting speed, reduce the pressure on the paper, and make the paper transport smoothly.
Position: Die cutter on both sides, 2mm from the knife, 1.2mm higher than the blade.
250 Sealed Arch Sponge Rubber:
Performance: 250,000 die cuts, 7500 rebounds/hour.
Specifications: 12×13×25000mm (board thickness 15mm).
Function: Eliminates jams, protects the position of the mouth, makes paper transport faster, and reduces paper dust and debris.
Location: Open position and all parts, 1.2mm above the blade. (Hongye Equipment Co., Ltd. Lu Xiangqian)
Stainless Steel Cookware Co., Ltd. , http://www.nscookwares.com