Recently, I have contacted several packaging companies and found that whether it is the decision-makers of the packaging companies that are being produced or the decision-makers of the companies that are preparing to introduce corrugated cardboard production lines during the inspection period, they do not know much about the selection and configuration of corrugated cardboard production lines, especially It is the key core component. When they inspect the new corrugated production line, they often consult some peers everywhere, or consult some equipment manufacturers. Due to the differences in the configuration of the production equipment of each company and the difference in the factory time, the performance of the equipment varies greatly, and the statements of the various manufacturers are also different, and each of the advantages of each makes the decision makers of some enterprises. Misty, I do not know how to decide.
I think that the selection of the corrugated board production line can follow some basic requirements below.
1 Good product market research is the basis of equipment selection
Corrugated carton products are a type of products that come in and go out. Considering the cost of freight and the timeliness of delivery, the market area of ​​such products is destined to not cover too much. The market is usually locked within a radius of 150 kilometers. Therefore, decision makers must investigate and investigate the main specifications and corrugated conditions of potential potential customers in the surrounding area, and be aware of them, so as to provide a basis for the next decision.
In addition, the equipment status of the competitors should be checked. Understand the management status and customer status in order to provide a basis for the formulation of the next marketing measures.
2 Consider the overall matching of the corrugated board production line
For the configuration of medium and high-speed production lines, we must consider the level of automation, as well as the overall matching and coordination of the production line.
Since the medium and high speed production line is selected, the relevant configuration with a high degree of automation should be selected. For example, you need to configure an automatic splicer. Production management system. Internal expansion chuck. Multi-point brakes. Fully automatic thin knife slitting machine (2 units are needed for quick order change). The slitting machine shall be equipped with three indentation cutter dies (according to customer needs). Spiral knife cross-cutting machine. Automatic glue making system. The gluing machine adopts pressure-regulating touch-pressure bar. The cadre uses hot pressing plate. The number of hot plates should match the speed and so on.
3 Focus on the rationality of several core components
1) Stick press stick
We know that the traditional glue machine adopts the method of gluing by the gravity pressure roller. If a small range of cardboard is produced for a long time, the middle part of the glue roller and the gravity pressure roller will be seriously worn. The middle part will be poorly glued, resulting in degumming of the cardboard. Problems such as blistering and poor bonding, and the places without wear on both sides will flatten and deform the corrugated cardboard to varying degrees due to pressure. Too much glue will make the cardboard soft and the strength will decrease.
When changing the paper weight and the corrugated shape, it is necessary to adjust the gap of the paper pressing gravity roller. This is a difficult task. If the adjustment is not good, the corrugated cardboard will be flattened or glued, which will cause the cardboard to be scrapped. If the operator uses a minimum gap regardless of the corrugated shape in order to save trouble, the strength of the cardboard will be severely damaged. For example, the corrugation height of B corrugation is 2.7mm, and the gap between the paste roller and the gravity pressure roller is 2.6mm according to the normal standard to achieve uniform paste, which means that the corrugated cardboard corrugated shape should be flattened by 0.1 according to normal adjustment. mm, and the flattened cardboard will use a lot of glue. Of course, the flattened and the amount of glued cardboard will drop a lot in hardness and compressive strength.
The pressure stick of the glue machine is installed on the laminating machine to replace the traditional gravity pressure roller, and is composed of a group of elastic pressure tablets with balanced pressure. The contact pressure bar is formed by connecting a lot of wear-resistant arc-shaped plates to the spring. The elastic force of the spring always allows the arc-shaped plates to evenly fit on the pasting roller. Even if the pasting roller is worn and depressed, the spring sheet With the depression, the corrugated core paper will always be evenly attached to the pasting roller to make the corrugated core paper evenly pasted.
The design of the pressure bar pressing tablet is the same as that of the pasting wheel to ensure stable pressure, uniform pasting and easy control of the amount of glue. There is an independently controlled elastic device on the tablet, which can automatically adjust irregular jumps, avoid flattening the corrugated shape, and ensure the strength of the cardboard. At present, the elastic device of the tablet has two methods: mechanical spring type and automatic pressure regulating type.
At present, Guangzhou Xiaohua Packaging Machinery Co., Ltd.'s pressure-regulating touch bar is much more reasonable and superior than the spring type touch bar, and it is more suitable for the transformation and configuration of existing domestic production lines. The pressure-regulating touch bar produced by the company has a high-quality stainless steel material for the pressure plate base material and a carbonized tungsten spraying on the working surface of the pressure plate (generally 10 wires), which has a long service life. The pneumatic pressure regulating system of the pressure-regulating touch bar adopts a stable and reliable cylinder-type push rod design, coupled with high-quality precision processing and imported wear-resistant pneumatic materials, to ensure that the touch bar can run stably and reliably for a long time, and the device does not need to Adjust the height to pass various paper materials at will. There is no need to adjust the gap when the paper material thickness and corrugated shape change. In this way, when the corrugated core paper is pasted into the paste machine, the corrugated height and the corrugated height of the paste machine after paste are basically unchanged, to avoid the occurrence of inverted corrugated or flattened corrugated points, to maintain a good corrugated shape, and the paste is uniform, Save a lot of corn starch glue. The final cardboard is close to the ideal standard, which makes the compressive strength high, ensuring the process requirements and the thickness of the cardboard. strength.
2) Hot pressing plate in drying section
The hot pressing plate of the drying section is installed at the hot plate portion, and is used to replace the traditional roller pressing shaft, so that the corrugated cardboard is quickly transferred to the hot plate portion for drying. The hot pressing plate of the drying section is made of a special wear-resistant material stainless steel sheet and a spring. Each hot drying plate is divided into a group, and each group of hot pressing plate can be according to different speeds. The temperature is automatically selected to rise and fall, easy to operate.
The hot plate has the characteristics of thermal expansion and contraction. When the corrugated cardboard is dried by the hot plate, it will take a lot of heat, making the temperature of the bottom and surface of the hot plate inconsistent. When the temperature above is low, the hot baking board will sag and deform, especially the first to fifth blocks have the most obvious changes. In addition, the traditional roller pressure axis is a straight line, which is a line contact and will not bend as the hot plate deforms. In this way, the middle part can not be touched, and the two sides are pressed too heavy, causing the middle of the cardboard to degumming. Foaming. Poor fit, etc., and the corrugated shapes on both sides are squashed. In addition, its heat transfer efficiency is low. If the vehicle speed is too fast, it will be degummed due to insufficient heat of the cardboard, resulting in poor bonding. Due to the distributed installation of the roller shaft, the weight is not easy to adjust, it is easy to flatten the corrugated corrugated shape and the phenomenon of inverted corrugation, the produced cardboard will also be uneven, especially when the single corrugated and double corrugated cardboard are changed Adjustment.
The hot plate pressure plate is specially designed for the above problems. Its working principle is the same as the spring type pressure bar on the paste machine. It is assembled by a spring and a group of wear-resistant stainless steel sheets. The spring with constant elasticity can be used at any time. Ensure that the required stable pressure is applied to the hot plate, so that the corrugated core paper is completely attached to the hot baking board, so that every place of the corrugated cardboard can be heated uniformly. Regardless of whether the hot plate is deformed, concave or convex, the spring with balanced elasticity always fits the piece of pressure plate to the hot plate with the depression or projection of the hot plate, even when using poor quality core paper The corrugated shape will be flattened, and the heating efficiency is high, the gelatinization speed is fast, and the cardboard is not degummed. No bubbles. Good fit, the cardboard produced is flat and hard, and has good compressive strength. According to tests, after the touch plate is modified, the heat transfer efficiency of the hot plate is much higher than that of the traditional roller pressure shaft type. Of course, the speed of the cardboard after entering the hot drying plate can be greatly improved.
In addition, each hot plate is divided into a group of hot press plates that can independently control the lifting, and each group of hot press plates can be controlled independently. According to different speeds. Different temperature can freely choose to rise and fall. It can be controlled automatically (PLC control) or manually, and it is very simple to use. Convenience.
3) Several mechanism configurations to reduce waste of base paper
In the low-speed production line manufactured previously, the chuck of the base paper holder is generally a hexagonal cone chuck. During use, the base paper paper tube and the inner paper edge will be broken, making the paper tail difficult to use, causing waste of raw materials. Most of the current medium and high speed production lines use internal expansion chucks. The structure is simple and does not require power assistance. The chuck ridges shrink or relax as the original paper holder traverses, and automatically expand and expand in the paper tube to fix the original paper Solved the shortcomings of the tapered chuck supporting the broken paper, and improved the paper utilization.
For the medium and high-speed production lines currently in production, the provision of automatic paper pick-up machines is also an important device for solving paper waste. Despite the relatively large input cost when the production equipment was just purchased, the automatic paper picking machine can realize zero paper tail picking, and can save a lot of base paper in one production shift. Generally, the length of the manual paper-receiving joint is about 3 ~ 5m, while the joint of the automatic paper-receiving machine is generally only 6 ~ 8cm, which can reduce the consumption of paper. Save fuel power and improve production efficiency.
Installing a constant tension control system is the key device to solve a series of quality problems of cardboard. Because the constant tension control system can always detect the tightness of the paper web, and adjust the braking force of the base paper brake (now needs to be equipped with multi-point brakes) in real time according to the changes, forming a control loop of detection-feedback-braking to make the paper web Always keep running at the set tension.
For medium and high speed machines, the 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 must be considered before selection.
In short, if the enterprise is equipped with advanced production line devices, then the quality of the cardboard will definitely be significantly improved. The amount of glue used is reduced, and the cardboard is thicker than before, with flat compression strength. Both the edge compression strength and the compressive strength increase. Then, the production technology management department can consider redesigning the corrugated roll flute height and flute pitch 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 can also create competition for business operations. Higher profits and market share.
Aroma Diffuser,Car Aroma Diffuser,Scent Diffuser,Ultrasonic Aroma Humidifier
Jiangsu Raymeel Home Decoration Co., Ltd. , https://www.raymeelhome.com