The carton enterprises should pay attention to the issues of using circular press die cutting machine

About 5 years ago, the understanding and understanding of the circular press die cutting machine in the carton industry was still very shallow. As the die-cutting technology in the post-press processing of corrugated boxes, it has been increasingly valued by the carton industry in recent years. From the scope of die-cutting, there are no more than three methods currently used in the country, namely round die-cut die cutting, flat die-cut die cutting, and round press die cutting.

Due to the low round die-cutting die cutting efficiency, poor die-cutting accuracy, and easy-to-use loss of machinery and equipment, it has been phased out and currently used manufacturers have gradually decreased. The traditional tiger mouth type in flat die cutting is still widely used, but the operation is dangerous and inefficient. If you use automatic flat die cutting, the price is too high, generally priced at 700,000 yuan -150 million, some manufacturers do not have the strength to buy, so I still choose to use tiger mouth type flat die cutting. That is to say, the domestic carton industry has already noticed and used circular press die cutting machines.

China's first round-circular die-cutting machine was first developed in 1978. It introduced three chain-type die-cutting machines from Japan. In the 1980s and 1990s, due to the cost of plate-making and other ancillary services, the promotion in the country has gone through a long process. The advantages and features of the round press die cutting machine are that the die cutting efficiency is fast, up to a maximum of 140 per minute, and the die cutting accuracy is high. It can be controlled at plus or minus 1 mm, and it is easy to operate, safe and reliable at a reasonable price. , equipment use a long time and so on. As for the current die-cutting equipment for corrugated carton processing, round-bore circular die-cutting has become the mainstream. Experts have predicted that the 5-inch circular die-cutting machine will be popularized in China. The circular press die cutting machine realizes die cutting at high speed through the principle of double roller press. Selecting a qualified round press die cutting machine has three major points that must be grasped. The first is the main configuration of the equipment, the second is the raw materials and processing accuracy used in the manufacturing equipment, and the third is the professional services of the system. From the first point of view, the equipment configuration will determine the advanced nature, practicality, and reliability of the equipment. Circular press die cutting machine is composed of three parts, namely die cutting part, paper feeding part and electrical control part. As far as the die cutting department is concerned, soft cutting is currently used. Soft cutting machine means to put a layer of high-strength polyurethane rubber sleeve on the roller. This is mainly to benefit and protect the service life of the die. Since this type of high-strength polyurethane rubber sleeve cannot be produced in China at present, most of them are imported into the United States or Taiwan. As a result, the price is also very expensive, so in the equipment configuration, there must be a mechanism for protecting and extending the service life of the rubber sleeve. The usual configuration is "soft roller automatic repair mechanism". The establishment of this configuration is mainly reflected in the uneven appearance of the rubber sheath surface after long-term use. At this time, the repair mechanism can automatically polish the surface of the rubber sleeve. The repaired rubber sleeve is intact and can be reused. Generally can be repaired 3 times - 4 times, each 1 mm - 2 mm, so that extended the use of rubber sleeves to improve the life of the rubber sleeve.

In addition, in the selection of rubber sleeves, the quality of imports from the United States is better than that from Taiwan, but the price is also doubled at the same time. Since the rubber sleeve is a normal consumable item, it is sooner or later to be replaced. In addition to the protection of the rubber sleeve by the configuration of the device itself, the experience of using the sleeve is also very important for the protection and extension of the sleeve. You can choose the price of Taiwan's rubber sleeves that are more economical to use. After you have mastered the experience, you can replace the American rubber sleeves. In addition, the protection configuration of the rubber sleeve is “soft roller left and right lateral movement device”. This mainly shows that when the die cutting machine rotates, the soft roller will reciprocate about 40 mm at the same time during the rotation, so that the cutting knife will be in different positions each time it is cut. This can avoid the old cutting a place and cause the glue. Set of partial damage.

At present, there are mainly two mechanisms for installing such lateral mobile devices on domestically manufactured equipment. One is a traditional hydraulic station device, which is a hydraulically-pulled principle that forcibly moves the drum left and right. There is also a mechanical mechanism. At present, more mechanical structures are used, mainly through the speed ratio of the upper and lower rollers, and the cam is used to control the movement of the soft rollers. The advantage of this mechanism is that there is a speed ratio control. Therefore, the speed of the soft roller is determined based on the speed at which the device operates. A problem arises when the soft roll is repaired, the soft roll diameter becomes smaller and the soft roll line speed also changes. This change will lead to such a result, the same die, the same product, but after die-cut, the size has become smaller. There was once a person in the carton industry asking for help online. The reason why the same product was unknowingly decreased in size was that it was returned when it was delivered and found that it caused serious economic losses to the company.

Therefore, the round press die cutting machine must be equipped with a "speed difference automatic compensation device." There are currently three kinds of such devices in the country. One is the speed difference equalizer, which is too expensive. One is the use of clutch surface speed compensation, more economical and practical. There is also a replacement of gears. Each time the soft cover is repaired, the gear is replaced. It is cumbersome and the compensation is not accurate. The main configuration of the die-cutting part is four points, one is the soft roller automatic repairing 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 moving device.

Regarding the paper feeding section, the circular press die cutting machine is classified into an adsorption type automatic feed paper and a chain type manual feed paper. Another type of paper feeding method is a relatively high-end leading-edge paper feeding system. Adsorptive automatic paper feeding has the advantages of high die-cutting precision and high efficiency, and is suitable for mass-producing various water-jet carton boxes; and the chain-type paper feeding is mainly to solve the die-cutting of the offset-cover carton.

Because there are errors in the process of covering the surface of the offset carton, cardboard bending may occur at the same time, and the use of chain feeding can solve these problems. Therefore, most manufacturers should fully consider the reordering of the produced products when selecting the equipment. As for the technology of the leading edge paper feeding system, it is mainly from abroad. At present, the domestic mastery of this technology is not mature enough, but manufacturers have started to develop and produce this technology. The advanced nature of the leading-edge paper feeding system is mainly manifested in faster efficiency, with up to 200 sheets per minute and high die-cut accuracy, plus or minus 0.5 mm. At the same time, the watermark and the offset carton can be fed smoothly.

The configuration of the paper feed section also includes adjustment of the paper feed phase and feed size. In these configurations, whether it is manual or electric, the impact on the equipment is not so important.

Finally, in terms of electrical configuration, since circular die cutting is not a very complicated device, it does not need to be complex and precise in electrical appliances. It can achieve production goals and it can be simple and practical. Therefore, in the electrical control is mainly displayed on the control of the main motor. At present, the main motor of most of the devices is the electromagnetic speed control motor, but the choice of frequency conversion speed control will make the equipment more stable operation, but also save power.

The raw materials and processing accuracy used in manufacturing equipment are critical to a qualified die-cutting machine. The printing presses such as Manroland and Heidelberg have been able to maintain their quality for several decades. In addition to their technological advancement, they largely depend on the matching of raw materials and the precision of processing.

First of all, from the perspective of circular die-cutting rollers, the wall thickness of die-cutting cylinders must not be less than 30 mm at the minimum. At the same time, the material of the rollers must reach 45# steel. After quenching and tempering, the hardness of the rollers can reach 60 degrees or more. At the same time, it requires balance correction in machining accuracy, surface grinding, hard chrome plating. As for the wallboard of the die-cutting machine, it is just as important as the foundation of the building. All the spare parts are installed on the basis of the wallboard. Therefore, the precision of wallboard processing will determine the installation accuracy of the equipment. The thickness of the wallboard can't generally be lower than 50 millimeters, it is better to use the processing center to make sure the overall structure and installation accuracy of the equipment.

Secondly, the gear transmission system directly determines the long-term stable operation of a device. There are many levels of gear material and machining accuracy, and the price gap is even greater. After the ordinary steel gears are quenched, they can generally reach grade 8 with a service life of about 5 years. Advanced transmission gear material selection 40Cr, after surface grinding, hardness up to 60 degrees -65 degrees, service life of 10 years is no problem. The raw materials for a piece of equipment are divided into processing parts and standard parts. In the use of standard parts must be the production of regular brand name manufacturers, can guarantee the normal use of equipment.

Thirdly, with respect to the services of professional systems, the selection of a device depends first on whether the manufacturer is professional, because each manufacturer has its own technical field and competitive products. Professional manufacturing can ensure professional quality, and can create quality products. It is the final winner in this field. As for services, they are divided into supporting services and after-sales services. Manufacturers with complete supporting services can provide super value-added assistance to customers. The related consumables and plate-making aids, such as the circular press die cutting machine, are all represented by the cost of use after purchasing the equipment. For after-sales service, it is not only a duty, but also a virtue and a spirit. Choose a good after-sales service, you can make you no worries.

In the selection of equipment, it is necessary to fully consider the production needs and equipment investment budget. Now the price of a round press die-cutting machine ranges from 30,000 yuan to 300,000 yuan. Choosing an ideal equipment can't just look at the price, nor can you just look at performance. Within the scope allowed by their own budget, the best performance in the same price region is selected, and the same price in the performance region is the cheapest. This is the concept of cost-effectiveness.