About 5 years ago, the carton industry's knowledge and understanding of the round die cutting machine is still very shallow. As the die-cutting technology in the post-press processing of corrugated boxes, it has been paid more and more attention by the carton industry in recent years. From the scope of die cutting, there are only three methods currently adopted in China, namely round flat die cutting, flat flat die cutting, and round flat die cutting.
Due to the low efficiency of circular flat die-cutting, poor die-cutting precision, and the easy use of machinery and equipment, it is already being phased out, and the number of manufacturers currently used has gradually decreased. The traditional tiger mouth type is still widely used in flat die cutting, but the operation is dangerous and inefficient. If the automatic flat die cutting is used, the price is too high, and the general price is about 700,000 yuan to 1.5 million yuan. Some manufacturers do not have the strength to buy it, so they choose to use the flat die cutting of tiger mouth. That is to say, the domestic carton industry has paid attention to and used the round die cutting machine.
The development of China's circular die cutting machine was first introduced in 1978. Three chain die cutting machines were introduced from Japan. From the 1980s to the 1990s, due to the expensive plate-making and other supporting service restrictions, the promotion in China experienced a long process. The advantages and characteristics of the round die cutting machine are fast die cutting efficiency, up to 140 pieces per minute, high die cutting accuracy, which can be controlled at plus or minus 1 mm, and simple equipment operation, safe and reliable, and moderate price , Long use time of equipment and other advantages. As for the current die-cutting equipment for post-press processing of corrugated cardboard boxes, circular die-cutting has become the mainstream. Some experts predicted that the circular die-cutting machine will be popularized in China within 5 years. The circular die-cutting die-cutting machine realizes die-cutting at high speed through the principle of double roller counter-pressure.
There are three main points that must be grasped when choosing a qualified round die cutting machine. The first is the main configuration of the equipment, the second is the raw materials and processing accuracy used in manufacturing the equipment, and the third is the professional service of the system. Let's start with the first point, the configuration of the equipment will determine the advancedness, practicability and reliability after using the equipment. The round die-cutting machine is composed of three parts, namely the die-cutting part, the paper feeding part and the electrical control part. As far as the die cutting section is concerned, soft cutting is currently used. The meaning of soft cutting machine is to put a layer of high strength polyurethane rubber sleeve on the roller. This is mainly beneficial to protect the service life of the die. Since such high-strength polyurethane rubber sleeves cannot be produced in China at present, most of them are imported into the United States or Taiwan. The price is also very expensive, so there must be a mechanism to protect and extend the life of the rubber sleeve in the equipment configuration. The usual configuration is "soft roll automatic repair mechanism". The establishment of this configuration mainly shows that when the surface of the rubber sleeve is used for a long time, it will be uneven. At this time, the repair mechanism can automatically repair the surface of the rubber sleeve, and the repaired rubber sleeve is intact and can be reused. Generally it can be repaired 3 times-4 times, 1 mm-2 mm each time, which extends the reusable rate of the rubber sleeve and improves the service life of the rubber sleeve.
In addition, in the selection of rubber sleeves, the quality imported from the United States is better than that imported from Taiwan, but the price has also doubled. Because the rubber sleeve is a normal consumable, it will be replaced sooner or later. In addition to the protection of the rubber sleeve by the configuration of the device itself, the experience when using it is also very important for the protection and extension of the rubber sleeve. You can choose the more affordable Taiwan rubber sleeve to use, and then replace the American rubber sleeve after you have mastered the experience. In addition, the protective configuration of the rubber sleeve also has a "left and right lateral movement of the soft roller". This is mainly manifested in that after the die-cutting machine rotates, the soft roller reciprocates left and right at the same time by 40 mm during the rotation process, so that the die-cutting knife is in a different position every time it cuts, so that it can avoid old cuts in one place, causing glue Set of local damage.
At present, there are mainly two types of mechanisms for installing such lateral movement devices on domestically manufactured equipment. One is the traditional hydraulic station device, which uses the principle of hydraulic pulling to force the roller to move left and right. There is also a mechanical mechanism. At present, there are many mechanical structures. The main difference is the speed ratio of the upper and lower rollers, and the movement of the soft roller is controlled by the cam. The advantage of this mechanism is that it has speed ratio control. Therefore, the moving speed of the soft roller is determined according to the speed at which the equipment operates. A problem will occur when the soft roll is repaired, the diameter of the soft roll becomes smaller, and the linear speed of the soft roll also changes. This change will lead to such a result, the same knife mold, the same product, but after the die is cut, the size becomes smaller. A person in the carton industry asked for help on the Internet and said, why the size of the same product has been unknowingly reduced, and it was discovered that it was returned when it was delivered, which caused very serious economic losses to the company.
Therefore, the round die cutting machine must be equipped with "speed difference automatic compensation device". There are currently three methods for this device in China. One is the differential speed equalizer, which is too expensive. One is the surface speed compensation using the clutch, which is more economical and practical. The other is to replace the gears. Each time the soft cover is repaired, the gears are replaced, which is troublesome and the compensation is not accurate. About the main configuration of the die-cutting part, there are four points, one is the soft roller automatic repair mechanism, the second is the speed difference automatic compensation device, the third is the imported soft cutting rubber sleeve, and the fourth is the soft roller lateral movement device.
Regarding the paper feeding part, the round pressure round die cutting machine is divided into adsorption type automatic paper feeding and chain type manual paper feeding. There is also a paper feeding method which is a relatively high-end cutting-edge paper feeding system. The advantages of adsorption-type automatic paper feeding are high die-cutting precision and fast efficiency, which are suitable for mass production of various watermarked cartons; chain-type paper feeding is mainly to solve the die-cutting of offset printed carton.
Because offset paper cartons have errors in the coating process and at the same time there will be a cardboard bending phenomenon, the use of chain feeding can solve these problems, so most manufacturers must fully consider the products they produce when choosing equipment. As for the technology of the leading-edge paper feeding system, it mainly comes from abroad. At present, the domestic grasp of this technology is not mature enough, but some manufacturers have begun to develop and produce this technology. The advanced nature of the leading-edge paper feeding system is mainly manifested in its faster efficiency, which can feed up to 200 sheets per minute, and the die cutting accuracy is also high, plus or minus 0.5 mm. At the same time, both watermark and offset carton can be fed smoothly.
For the configuration of the paper feed section, there are also paper feed phase adjustment and paper feed size adjustment. In these configurations, whether it is manual or electric, the impact on the device is not too important.
Finally, in the configuration of electrical appliances, because the round die cutting is not very complicated equipment, so the electrical appliances do not need to be very complicated and precise, can achieve production goals, simple and practical. Therefore, the control of electrical appliances is mainly shown in the control of the main motor. At present, the main motor of most equipment is an electromagnetic speed control motor, but the choice of frequency conversion speed control will make the equipment run more stable and save power.
The raw materials and processing accuracy used in manufacturing equipment are crucial to a qualified die-cutting machine. The reason why the printing machines like Manroland and Heidelberg can keep the quality unchanged for decades, in addition to the advancement in technical design, largely depends on the selection of raw materials and the accuracy of processing.
First of all, starting from the round die-cutting die-cutting roller, the wall thickness of the die-cutting roller should not be less than 30 mm, and the material of the roller must be 45 # steel, which is quenched and tempered to make it more than 60 degrees At the same time, it requires balance correction in processing accuracy, surface grinding, and hard chrome plating. For the wall panel of the die-cutting machine, it is as important as the foundation for building a house. All the parts are installed on the basis of the wall panel. Therefore, the processing accuracy of the wallboard will determine the installation accuracy of the equipment. The thickness of the wallboard is generally not less than 50 mm. It is best to use a machining center to ensure the overall structure and installation accuracy of the equipment.
Secondly, the gear transmission system directly determines the long-term stable operation of a piece of equipment. There are many grades of gear materials and machining accuracy, and the price gap is even greater. After quenching, ordinary steel gears can generally reach grade 8, and the service life is about 5 years. The material of advanced transmission gear is 40Cr. After surface grinding, the hardness can reach 60 degrees to 65 degrees, and the service life of 10 years is no problem. The raw materials of a piece of equipment are divided into processed parts and standard parts. In the adoption of standard parts, it must be produced by regular brand-name manufacturers to ensure the normal use of the equipment.
Third, regarding the service of professional systems, the choice of a device depends on whether the manufacturer is professional, because each manufacturer has its own technical field and leading products. Only professional manufacturing can guarantee professional quality, can we create quality products, and be the last winner in this field. As for services, it is divided into supporting services and after-sales services. Manufacturers with complete supporting services can provide customers with super value-added assistance. Such as the consumables and plate making equipment of the round die cutting machine, these are reflected in the cost of using the equipment after purchase. For after-sales service, it is not only a responsibility, but also a virtue and a spirit. Choosing a manufacturer with good after-sales service can make you worry-free.
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