Nowadays, with the improvement of per capita living standards and the increase in demand, the logistics industry has become more and more popular. It has also found that both the decision-makers of packaging companies that are in production and the decision-makers who are preparing to introduce corrugated cardboard production lines during the inspection period The selection and configuration of corrugated paperboard production lines is not well understood, especially for the key core components. When they are looking at new corrugated production lines, they often consult a number of peers around, or consult with some equipment manufacturers. Due to the differences in the configuration of production equipments and the differences in the delivery time, the performance of the equipment varies greatly. Moreover, the arguments of various manufacturers are not the same, and the advantages of each of them make the decision makers of some companies Fog, I do not know how to decide.
Therefore, the selection of corrugated board production lines can follow the following basic requirements.
1 Doing product market research is the basis for equipment selection
Corrugated box products are a type of products that are large in and large out. Taking into account the cost of shipping and the timeliness of delivery, the market area of such products is bound to not cover too much. The market scope is usually locked within a radius of 150 kilometers. Therefore, decision-makers must conduct surveys and investigations on the major specifications and defects of major potential customer products, so as to provide a basis for the next decision.
In addition, we also need equipment condition of peripheral competitors. Management status and customer status are understood to provide the basis for the next step in the development of marketing measures.
2 Consider the overall matching of corrugated board production lines
For the configuration of medium and high-speed production lines, we must consider the degree of automation, as well as the overall supporting and coordination of the production line.
Since the medium and high-speed production lines are selected, the relevant configuration with a high degree of automation should be selected. For example, you need to configure the Automatic Splicer. Production Management System. Internal riser chuck. More brakes. Full-automatic thin knife slitter (for quick change order, 2 sets). The slitting machine is equipped with three indentation cutters (according to customer's needs). Spiral knife cutting machine. Automatic gluing system. The paste machine adopts pressure regulating pressure bar. Cadres use hot plate. The number of hot plates must match the speed.
3 Focus on the rationality of several core components
1) Stick press stick
We know that the traditional gluing machine uses a gravity roller gluing method. If a small amount of cardboard is produced for a long time, the middle part of the upper gluing roller and the gravure roller will be seriously worn. When large-format cardboard is produced, the middle part will wear out. The middle part will not be good glue, causing cardboard degumming. Problems such as blistering and poor adhesion, and the places where there is no wear on both sides, due to pressure, will cause the corrugated cardboard shape to be flattened and deformed to varying degrees. Excessive amount of glue will cause the cardboard to become soft and decrease its strength.
When changing the weight of the paper and the corrugated shape, it is necessary to adjust the gap of the pressure roller. This is an inconvenient task. If the adjustment is not good, it will flatten the paperboard corrugated or cannot be glued, resulting in the cardboard being scrapped. If the operator wants to save time, no matter what type of rake type is used a minimum gap, the strength of the cardboard will be severely damaged. For example, the height of the B-tile is 2.7mm. According to the normal standard, the gap between the paste roller and the gravure roller is 2.6mm to paste evenly, which means that the corrugated cardboard must be flattened according to the normal adjustment. Mm, but the squashing of the cardboard will use a lot of glue, of course, squashing and gluing a lot of cardboard in the hardness and compressive strength will drop a lot.
The paste press stick is installed on the Laminating Machine to replace the traditional gravure pressure roller and consists of a set of elastic compression tablets with pressure equalization. The contact pressure bar is formed by connecting a plurality of wear-resistant curved sheet plates and a spring. The elastic force of the spring always allows the arc-shaped sheet to evenly fit on the upper paste roller, even if the upper paste roller wears and recesses, the spring sheet plate Also with the depression, the corrugated paper is always evenly attached to the upper paste roller, so that the corrugated paper is uniformly pasteted.
The contact pressure bar tablet design has the same curvature as the upper paste wheel to ensure stable pressure, uniform paste, and easy control of the amount of glue. There is an independently controlled elastic device on the tablet, which automatically adjusts the irregular beat, avoids flattening of the shape and ensures the strength of the cardboard. At present, on the market, the elastic devices for tableting are mechanical spring type and automatic pressure type.
At present, the pressure regulating pressure bar produced by Guangzhou Xiaohua Packaging Machinery Co., Ltd. is more reasonable and superior than the spring type pressure bar, and is more suitable for the needs of the existing domestic production line transformation and configuration. The company's pressure-produced pressure bar, the pressure plate base material using high-quality stainless steel, pressure plate working surface using carbonized tungsten spray (usually 10 wire), long life. The pneumatic pressure regulating system of the pressure regulating pressure bar adopts a stable and reliable cylinder type push rod design, and is equipped with high-quality precision machining and imported wear resistant pneumatic materials to ensure long-term stable and reliable operation of the touch bar, and the device does not need to be used. Adjust the height to feel free to use a variety of paper materials. There is no need to adjust the gap when the material of the paper is thin and the shape of the die is changed. In this way, when the corrugating medium paper is pasted on the paste machine, the height of the corrugated medium and the height of the corrugated file after exiting the paste machine are basically the same, and the occurrence of falling or flattening of the tip of the file is avoided, the shape of the file is maintained, and the paste is uniformly distributed. Save a lot of corn starch glue. The final board is close to the ideal standard, so that the compressive strength is high, ensuring the process requirements and the thickness of the board. strength.
2) Drying section hot plate
The hot platen of the drying section is installed on the hot plate, which is used to replace the traditional roller press shaft, so that the corrugated board can be quickly heat-transfer and dried in the hot plate section. The hot pressing plate of the drying section is made of specially made stainless steel sheets of wear-resistant material and springs. Each hot baking plate is divided into a group, and each group of hot pressing plates can be based on different speeds. The temperature is automatically selected for lifting and it is easy to operate.
The hot plate has the characteristics of thermal expansion and contraction, when the corrugated board is dried by the hot plate, it will take a lot of heat, so that the temperature of the hot plate bottom and the surface are inconsistent. The above temperature is low, and the hot bake plate is concavely deformed, especially in the first to fifth blocks. In addition, the traditional roller mandrel is a straight line that is line contact and does not bend as the hot plate deforms. In this way, the middle part is not pressed, and both sides are too heavy, causing the cardboard to debond. Foaming. Poor adhesion, etc., and the corrugations on both sides are flattened. In addition, its heat transfer efficiency is low, if the speed is too fast, the cardboard will degummed due to insufficient heat, resulting in poor adhesion. Due to the fact that the roller press shaft is installed in a decentralized manner, the weight is not easy to adjust, and it is easy to flatten and collapse the corrugated board shape, and the produced cardboard will also be uneven, especially when the single corrugated board and the double corrugated cardboard are changed. Adjustment.
The hot plate press plate is specially designed for the above problems. Its working principle is the same as the spring type touch bar on the paste machine. It is assembled by the spring and the group of wear-resistant stainless steel plates, and the elastic spring can be used at any time. The stable pressure required to apply to the hot plate is ensured so that the corrugating medium is completely attached to the hot bake plate so that every place of the corrugated cardboard can be heated evenly. Regardless of whether the hot plate is deformed or bulged, the elastically balanced spring always sticks a piece of platen to the hot plate as the hot plate dents or bulges, even if a poor quality core paper is not used. It will flatten the shape of the cocoon, and it will have high heating efficiency, high gelatinization speed, and the cardboard will not be debonded. Not foaming. With good fit, the paperboard produced is both flat and hard and has good compressive strength. According to the test, after refitting the pressure plate, the heat transfer efficiency of the hot plate is much higher than that of the traditional roller shaft type. Of course, the speed of the board after entering the hot plate can be greatly improved.
In addition, each hot plate is divided into a set of hot platens that can individually control the lift. Each hot plate can be individually controlled. Can be based on different speeds. Different temperatures freely choose to lift. The lift can be controlled automatically (PLC controlled) or manually, making it very easy to use. Convenience.
3) Several institutional configurations to reduce waste of raw paper
In the previously-manufactured medium and low-speed production lines, the chuck of the original paper holder is generally a hexagonal cone chuck. During use, the paper paper tube and the inner paper edge are broken, making the paper tail difficult to use, resulting in waste of raw materials. Now most of the medium and high-speed production lines use internal-increment chucks. The structure is simple, without power assistance. The chuck ribs shrink or loosen as the paper frame is moved horizontally. They automatically expand and expand in the paper tube to fix the base paper. The utility model solves the disadvantage of the cone-shaped collet breaking the tail paper and improves the paper utilization rate.
For the medium and high-speed production lines now being produced, the provision of an Automatic Splicing Machine is also an important equipment for solving paper waste. Although the cost of investing in the production equipment has just been increased, the automatic splicer can realize zero-end paper-making, which can save a lot of original paper in one production shift. Usually, the length of the manual take-up joint is about 3~5m, and the joint of the automatic take-up machine is generally only 6~8cm, which can reduce the paper consumption. Save fuel and increase productivity.
The installation of constant tension control system is a key device to solve a series of quality problems of cardboard. Because the constant tension control system can detect the tightness of the web at all times and adjust the brake force of the original paper brake (now equipped with a multi-point brake) in real time according to the change, a control loop is formed to detect, feedback, and brake the web. Always operate at the set tension.
For medium and high-speed machines, the provision of a production management system is an important measure to solve paper waste and save fuel power, and an important part of improving production efficiency, so it should be considered before selection.
In short, the company is equipped with advanced production line devices, so the quality of cardboard will certainly be significantly improved. With less glue, the board is also thicker than the original, flat compressive strength. Both side pressure strength and compressive strength increase. Then, the production technology management department can consider redesigning the corrugation roll height and lay length to change the shrinkage rate of the core paper so as to obtain a smaller amount of core paper, reduce a large amount of direct material costs, and create a great deal of business for the company. Higher profits and market share.
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