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Introduction in recent years, with the continuous development of 50Hz polymer modified materials, the requirements for mixing equipment are becoming higher and higher. Twin screw extruder is one of the most widely used equipment in continuous mixer. Of course, it has received extensive attention, and more and more research has been focused on it. At present, according to the development trend at home and abroad, twin-screw extruders are mainly developed to high speed, large torque, large extrusion capacity and low energy consumption. The split parallel twin-screw extruder is a high-speed high torque extruder which can quickly open the barrel for material cleaning

II. Structural features

the remarkable features of the split co-directional parallel twin-screw extruder are that the barrel can be split and the screw and the bushing in the barrel can be combined at will

1. Split barrel. In the past, the barrel of twin-screw extruder was integral and could not be opened. The split twin-screw extruder is a split type, which is composed of the upper and lower half of the barrel whose resistance to deformation is enhanced. The lower half of the barrel is fixed on the frame, and the upper half of the barrel is connected to the lower half of the barrel through the worm gear reducer. At ordinary times, the upper half cylinder and the lower half cylinder are fastened with two rows of bolts. When the cylinder needs to be opened, just loosen the bolts and turn the worm gear box handle to open the cylinder

2. Building block screw and barrel. The screw and barrel of the main machine of the split twin-screw extruder adopt advanced "building block" design. The screw is composed of various forms of screw blocks sleeved on the mandrel. The inner bushing in the barrel can be adjusted according to the different screw blocks, so as to flexibly combine the ideal screw element structure according to the process requirements such as material varieties, so as to realize the transportation, plasticization, refinement, shearing, exhaust Various technological processes such as pressure building and extrusion can better solve the contradiction between the so-called universality and specificity of the screw, which is difficult to take into account in general, and achieve the purpose of one machine with multiple functions and one machine with multiple functions. Another advantage of the "building block" design is that the worn screw and cylinder components can be partially replaced, avoiding the scrapping of the whole screw or cylinder and greatly reducing the maintenance cost

l、 Host double clock Huaining said: "1. Strengthen the standard training and publicity. The screw is of high-speed and same direction meshing type, which can produce very strong and complex functions such as material transfer and exchange, shunt mixing and shear kneading in various threads and mixing elements. These functions can be fully and freely adjusted and controlled by changing the screw configuration and operating process conditions to meet the requirements of various processes.

2. Accurate measurement and reasonable feeding methods are strictly implemented The key to formula is also the first step to ensure product quality. According to the performance of materials and the needs of users, we are equipped with a variety of feeding methods, such as volume measurement, dynamic weight loss measurement, etc., to meet the needs of different products

3. Advanced control system. The extruder is equipped with an advanced and beautiful control system. Most of its control components are imported components with good quality and high sensitivity. The operating parameters of the host such as current, voltage, temperature, torque, etc. are very intuitive, so it is very convenient to operate, and the requirements for operators are not high

4. The system is equipped with wire drawing water cooling granulation, hot water cooling, hot air cooling and other granulation methods. It can be configured according to different materials and user requirements

III. advantages

1. Visually understand the wear of vulnerable parts. Since it is easy to open, the wear degree of the threaded elements and the bushing in the barrel can be found at any time, so as to carry out effective maintenance or replacement. It will not be found when there are problems in the extruded products, resulting in unnecessary waste

2. Reduce production cost. When manufacturing master batch, it is often necessary to change the color. If it is necessary to change the product, open the open processing area within a few minutes. In addition, the mixing process can be analyzed by observing the melt profile on the whole screw. At present, when the common twin-screw extruder changes color, it needs to use a large amount of cleaning materials to clean the machine, which is time-consuming, power consuming and waste of raw materials. The split twin-screw extruder can solve this problem. When changing the color, the barrel can be quickly opened in a few minutes for manual cleaning. In this way, the cleaning materials can be avoided or used less, which saves the cost

3. Improve labor efficiency. During equipment maintenance, common twin-screw extruders often remove the heating and cooling systems first, and then extract the screws as a whole. The split twin screw is not used. Just loosen a few bolts, turn the worm gear box handle device to lift the upper half of the barrel, and then open the whole barrel for maintenance. This not only shortens the maintenance time, but also reduces the labor intensity

4, high torque, high speed. At present, the development trend of twin-screw extruders in the world is towards high torque, high speed and low energy consumption. The effect of high speed is high productivity. The split twin-screw extruder belongs to this category, and its rotational speed can be increased by 500 rpm. Therefore, it has unique advantages in processing high viscosity and heat sensitive materials

5. It has a wide range of applications and can be applied to the processing of a variety of materials.

6. It has other advantages of ordinary twin-screw extruders and can achieve high output, high quality and high efficiency

IV. application examples

1. Glass fiber reinforced, flame retardant granulation (such as PA6, PA66, pet, PBT, PP, PC reinforced flame retardant, etc.)

2. High filler granulation (such as PE, PP Filled with 75%caco.)

3. Granulation of heat sensitive materials (such as PVC and XLPE cable materials)

4. Dense masterbatch (such as filling 50% toner)

5. Antistatic masterbatch, alloy, coloring, low filling blending granulation

6. Granulation of cable materials (such as sheath materials and insulating materials)

7. Granulation of XLPE pipe materials (such as masterbatch for hot water crosslinking)

8 Thermosetting plastics mixing and extrusion (e.g. phenolic resin, epoxy resin, powder coating)

9, hot melt adhesive, Pu reactive extrusion granulation (e.g. EVA hot melt adhesive, polyurethane)

10, K resin, SBS devolatilization granulation

as long as they are done well, they can become good products

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