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1. Selection of high-quality materials: The materials for the screw barrel should be high strength, high wear resistance, and high corrosion resistance materials, such as high-quality alloy steel, stainless steel, etc. 2.Strengthening surface hardening treatment: Through surface hardening treatment, the hardness and wear resistance of the screw barrel can be improved. Common surface hardening treatment methods include nitriding, hard alloy coating, etc. 3.Strengthen lubrication maintenance: The screw barrel needs to be kept in a good lubrication state during use to reduce wear and friction and extend its service life. 4.Strengthen cleaning and maintenance: Regularly clean the inside of the screw barrel, remove accumulated impurities and dirt, and maintain the cleanliness and hygiene of the inside of the machine. 5. Reasonable use: When using the screw barrel, attention should be paid to avoiding overload and excessive speed operation, avoiding excessive pressure and friction on the machine, thereby extending its service life. 6. Regular maintenance: Regularly inspect and maintain the screw barrel, timely detect and handle machine faults and problems, and ensure the normal operation and service life of the machine.

The screw barrel is one of the core components of a plastic extruder. Its function is to melt and compress plastic, pushing it through the extrusion port to form the desired product. Different models of screw barrel are suitable for different extrusion processes and plastic materials, with the main differences in the following aspects: Diameter and length: The diameter and length of the screw barrel can affect the melting and extrusion effects of plastics. Generally speaking, the larger the diameter, it is suitable for extruding large-sized products; The longer the length, it is suitable for extruding high viscosity plastic materials. Pitch and Thread Depth: Pitch and thread depth determine the compression ratio and shear force of the screw barrel. For different plastic materials and extrusion processes, it is necessary to select different pitches and thread depths to achieve the best extrusion effect. Material and surface treatment: Screw barrel is usually made of high-strength alloy steel or stainless steel, and its surface is specially treated to improve its wear resistance and corrosion resistance. Different materials and surface treatment methods can affect the service life and extrusion effect of the screw barrel. In summary, selecting a suitable screw barrel model is one of the keys to ensuring the quality and production efficiency of extrusion products.

As an important plastic processing equipment, screw barrel has developed rapidly in China in recent years. With the continuous growth of the domestic plastic processing industry, the demand for screw barrel is also increasing. At the same time, with the continuous progress of science and technology, the technical level of screw barrel has also been continuously improved, and the product quality and performance have been further improved. In recent years, the development of screw barrel is mainly manifested in the following aspects: 1. The technical level has been continuously improved. With the continuous progress of science and technology, the production technology of screw barrel continues to innovate, and new materials and processes continue to be applied. The quality and performance of products have been further improved. 2. The market demand continues to increase. With the continuous development of the domestic plastic processing industry, the demand for screw barrel is also increasing. Especially in the fields of automobiles, electronics, medical devices, and other fields, the application of screw barrels is becoming increasingly widespread. 3. Enterprise competition intensifies. With the continuous expansion of the market, the number of screw barrel manufacturers is also increasing, and competition is intensifying. Enterprises need to continuously improve product quality and service levels in order to remain invincible in market competition. To sum up, screw barrel has achieved rapid development in China in recent years, and there is still more room for development in the future. Enterprises need to continuously innovate and improve product quality and service levels to meet market demand.

The development of the screw barrel industry is driven by the global economy. With the increase of market demand, the screw barrel industry is also growing, technology and equipment are also improving, and the development direction of the screw barrel industry is also changing. First of all, the development of the screw barrel industry is driven by the market demand. The customer group of the screw barrel industry is constantly expanding, which has spawned new market demand. This requires the screw barrel industry to improve technology and equipment to meet the market demand. Secondly, the development direction of the screw barrel industry is also changing. The screw barrel industry is developing in the direction of high efficiency, high quality and low cost to meet the needs of customers. At the same time, the screw barrel industry is also increasing investment, improving technology and developing new products to meet market demand. Finally, the development of the screw barrel industry has also been affected by the policies. The government supports the development of the screw barrel industry by relaxing relevant policies and providing more financial support to promote the development of the screw barrel industry. In short, the development of the screw barrel industry has been affected by the market demand, technology and equipment improvement, policies and other aspects. The screw barrel industry is growing to meet the market demand.

As one of the pillar industries of light industry, the injection molding industry has penetrated into all aspects of life. As the main equipment for injection molding production, injection molding machines coexist with high, medium and low grades, with a wide range of types and endless application types. Even many professionals in the injection molding processing industry are dazzled and it is difficult to choose the injection molding machine that suits their needs. . Many engineering and technical personnel of injection molding machine manufacturers will also compile some reference materials on how to choose injection molding machines, which are used when equipment manufacturers choose. However, the injection molding machine selection methods involved in these materials are generally too one-sided, focusing on the introduction of mold installation, injection volume and clamping force verification, etc., which is equivalent to the manual written by the mobile phone manufacturer, telling you that this mobile phone can make calls and send messages. Information, surfing the Internet and listening to music and other functions, but did not tell you why this mobile phone compares with other mobile phones, single screw and barrel why the Internet speed is not as fast as other mobile phones, and why the sound quality is better or worse, etc. The same is true for injection molding machines. Some injection molding machines have an injection position that can be accurate to 0.02 mm, and some injection molding machines fluctuate within 2 mm. The reason for this difference is not written by the technicians of injection molding machine manufacturers. Basically, the introductions we have seen in the selection of injection molding machines in the past all require the injection molding machine to "sufficient injection volume, place the mold down, lock tightly, and fully shoot." In fact, the workshop technicians of the injection molding machine manufacturer know it. These rules, but sometimes the technicians just don't understand why this machine is better than the other machine next to it, and why the process parameters of this machine can't be used at all on another machine of the same model. How can a technician distinguish the quality of an injection molding machine? Here is a simple way to verify the repeatability of an injection molding machine. When setting injection parameters, set injection holding pressure, speed, and time to 0. When injecting products, first shoot the gate according to the normal parameter settings, then accelerate to the first stage, and then fill to 90-95% of the product full of glue. , To ensure that the product lacks a corner state, use the position injection method to shoot the glue, and ensure that the time of each injection is completely the same during the injection molding process (inconsistency indicates that the adjusted parameters are problematic, and the parameters cannot be guaranteed to be executed according to their own adjustment). If there is no change in temperature, repeatedly manufacture N pieces of products, weigh N pieces of trial-produced pieces, and draw the product weight change diagram, and you can see the product weight change circuit diagram. When the average weight deviation between the product and the N products exceeds 0.3%, then The stability of the machine is poor, exceeding 0.5%. The editor of Damxun recommends that the machine be overhauled.

The bending deformation of PVC profile is a common problem in the extrusion process. The main reasons are: uneven discharge of the die; insufficient cooling of the material during cooling and shaping, and inconsistent shrinkage; equipment and other factors. It is recommended to solve from the following aspects: 1. Ensure the concentricity and levelness of the entire extruder line, and correct the concentricity and levelness of the extruder, die, shaping die, water tank, etc. every time the die is changed. 2. Carefully assemble the die before starting the machine to make single screw and barrel the gap between all parts consistent. If the die is found to be unevenly discharged when starting up, adjust the temperature of the die according to the bending and deformation direction of the parison to ensure uniform discharge of the die, such as adjusting the mouth The mold temperature is invalid, and the plasticization degree of the material can be appropriately increased. 3. Adjust the cooling system of the shaping die and increase the amount of cooling water on the side of the large material that bears the tensile stress. 4. Use the method of mechanical offset center adjustment, that is, adjust the positioning bolt in the middle of the shaping die while producing, and make reverse micro-adjustment according to the bending direction of the profile (the method should be used with caution and the adjustment should not be too large). 5. Pay close attention to the work quality of the mold, pay attention to the maintenance of the mold, and maintain and maintain the mold at any time according to the actual situation

The working condition of the extruder that needs to clean the screw is generally to change the color or restart after the machine has black spots. There are two common methods: one is to wash with raw materials or nozzle materials, and the other is to directly pull the screw for polishing and cleaning. The method of drawing the screw affects the precision of the equipment. Pulling the screw for a long time affects the fit between the accessories. Polishing the screw also affects the surface smoothness of the screw. It is easier to leave resin in the subsequent production, resulting in material decomposition and carbon deposits. However, using raw materials to wash the machine takes a long time and requires a lot of cleaning materials, which will inevitably affect the efficiency of production. So what method is more effective for extruder screw cleaning? The following solutions are recommended: 1. For color change: Use professional screw cleaning materials to clean through the machine, which can save time and the amount of cleaning materials, especially for color patterns, weld lines, etc. 2. Aiming at the problem of black spots during shutdown: We recommend using a screw cleaning material that is not easy to carbonize to stay in the screw during shutdown, fill the screw, and replace it with raw materials when starting up. The advantage of this is to fully replace the original material. , To avoid carbonization of materials in the screw, and at the same time to bring out the original impurities in the screw. This cleaning material is called shutdown maintenance material. Everyone may wish to search.

For hygroscopic materials (such as nylon), the high water content of the resin can also cause the screw to slip. Improper drying will significantly reduce the viscosity of the material and generate water vapor in the drum, resulting in a reduction in the conveying capacity of the screw. In fact, there are many reasons for slippage, which may be related to high back pressure, overheating or overcooling of the end of the cylinder, wear of the cylinder or screw, conical screw barrel too shallow threads in the feed section, unfair hopper planning, and hopper blockage, resin wetness, excessive resin lubrication, Resin materials are too fine and unfair recycling of raw materials is related to other factors. The overcooling at the end of the cylinder is one of the main causes of screw slippage. The cylinder of the injection molding machine is divided into 3 parts. At the end, the feeding part, the granular material will form a molten film that sticks to the screw during heating and compression. Without this film, the particles are not easily transported to the front end. The material in the feed section needs to be heated to the boundary temperature to form a molten film at this stage. However, usually the material stays in the feed section for a short time and cannot reach the required temperature. This environment is usually generated on small injection molding machines. If the residence time is too short, the process of melting and inclusion of the polymer will be incomplete, causing the screw to slip or stall.

The screw consists of a feeding section, a compression section and a metering section. The outer surface of the screw is a cylinder with a spiral groove or a cone with a conical spiral groove. Screws are used in plastic molding equipment, barrel nuts and screw such as plastic profile extruders, injection molding machines, molding machines, rubber machines, etc. Screw and barrel are the core components of plastic molding equipment. Working principle: plastic transportation, compaction, melting, mixing and pressing. This is achieved by rotating the screws in the barrel. When the screw rotates, the plastic will generate friction and mutual movement between the inner wall of the barrel, the bottom surface of the screw groove, the advancing surface of the screw edge, and the plastic and the plastic. The forward movement of the plastic is the result of this combination of movements, and the heat generated by friction is also absorbed to increase the temperature of the plastic and the molten plastic. The design structure of the screw will directly affect the extent of these effects. The screw is composed of a screw, a nut and a ball. Ball screws are commonly used transmission components in tool machinery and precision machinery. Its main function is to convert rotary motion into linear motion or torque into axial repetitive force. It has the characteristics of high precision, reversibility and high efficiency. Because of its low frictional resistance, ball screws are widely used in various industrial equipment and precision instruments. working principle: Ball screws are used to convert rotary motion into linear motion. Or it can convert linear motion into rotary motion, which has the advantages of high transmission efficiency and accurate positioning. When the ball screw is used as the driving body, the nut will be converted into linear motion according to the guide of the corresponding specification along with the rotation angle of the screw. The passive workpiece can be connected with the nut through the nut seat to realize the corresponding linear motion.

I think most users will be troubled by this problem, that is, the injection screw is slipping. So what caused this situation? For hygroscopic materials (such as nylon), the high water content of the resin can also cause the screw to slip. Improper drying will significantly reduce the viscosity of the material and generate water vapor in the drum, resulting in a reduction in the conveying capacity of the screw. In fact, there are many reasons for slippage, which may be related to high back pressure, overheating or overcooling of the end of the cylinder, wear of the cylinder or screw, too shallow threads in the feed section,injection screw barrel unfair hopper planning, and hopper blockage, resin wetness, excessive resin lubrication, Resin materials are too fine and the unfair recycling of raw materials is related to other factors. The overcooling at the end of the cylinder is one of the main causes of screw slippage. The cylinder of the injection molding machine is divided into 3 parts. At the end, the feeding part, the granular material will form a molten film that sticks to the screw during heating and compression. Without this film, the particles are not easily transported to the front end. The material in the feed section needs to be heated to the boundary temperature to form a molten film at this stage. However, usually the material stays in the feed section for a short time and cannot reach the required temperature. This environment is usually generated on small injection molding machines. If the residence time is too short, the process of melting and inclusion of the polymer will be incomplete, causing the screw to slip or stall.