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| Technology & development trend of anisotropy parallel twin-screw extruder |
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The world's first twin-screw extruder is England in 1869 for the development and manufacture of sausage made for the plastic processing of the first twin-screw extruders in Italy in 1937 is successfully developed, and since then, Twin-screw extruder applications on the rise. Before the 50s, because of its screw extrusion system and barrel manufacturing, as well as the complexity of the assembly of precision machinery requirements, coupled with the twin-screw extruders in the structure of the restrictions thrust bearing life issues have not been very good Resolve, and we have not been developed rapidly. The world oil crisis, caused by a synthetic resin and plastic products cost significantly affects the application of plastic products to promote. As a result, people in order to cut costs, to turn around the situation: on the one hand, to add low-cost resin material (such as CaCO3, wood flour, etc.), but adding the filler and resin compatibility of the poor, and the proportion of liquidity, such as different , It is difficult to achieve an effective mix of both, to bring out the production of certain difficulties; on the other hand, continuous improvement of processing equipment, molding, the cheaper raw materials to produce high-performance resins and high-quality products. Ever-increasing demands to make a single screw extrusion machine could not do, and the twin-screw extruder it can adapt to such a request, this time, twin-screw extruder has begun to attract widespread attention, and it Has been developing rapidly.
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Since the 50's, about two-screw extruder of engagement principle, the theory of plastic materials, the structure of the transmission system, temperature control accuracy of the materials, processing technology and products such as the formulation of theoretical research breakthroughs have been For the last two decades, twin-screw extruders in the design and manufacture of a range of issues have been resolved, it has grown by leaps and bounds.
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At present, the profile extrusion used in the production of the extruder mainly single-screw extruder, parallel to the different twin-screw extruders, and conical twin-screw extruder. Conical twin-screw extruder as a different twin-screw extruder to a special branch of the development in recent years, and with its own unique characteristics in the profile extrusion industry has been producing a wide range of applications. On the following twin-screw extrusion technology in the PVC-U profile / pipe out of the application and development trends to explore.
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First, different to the twin-screw extruder performance characteristics
1.1 pairs of PVC-U extrusion production lines, the following general requirements:
1) and efficiently in a row to make PVC plastics materials sufficient to achieve stability in continuous production.
2) To establish a stable extrusion pressure and effective to overcome resistance to the head, so that temperature, pressure, out of the quantitative.
3) The effect of exhaust, high-quality products.
4) and a stable of different formulations of the applicability of the strong.
5) The production of the products than the power (in production time per one kilogram of products consumed by the power transmission) low to achieve high efficiency out of production.
6), reliable performance, whole life long, good maintenance.
7) To facilitate the safe operation, to achieve a high degree of automation of production.
8) Beautiful design, the reflect the rich connotations of the product and in-depth product personality.
1.2 We used PVC-U profile extrusion of the three extruder comparison found:
The single screw extruder in the name of power than in the general 0.36 ~ 0.4KW / (kg / h) between.
Parallel to the different twin-screw extruders in the nominal power is 0.14 ~ 0.16KW / (kg / h).
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Conical twin-screw extruder is with lower power than the name of 0.14KW / (kg / h).
In fact, the PVC-U extrusion process for the production of 350Kg / h below the production out of the general selection of little-90mm in diameter below the conical twin-screw extruder, as a result of conical twin-screw extrusion A machine power than smaller, more economical production, the cost of equipment at the same time there are advantages. Fukuda, such as building materials production SJZ35/80 , SJZ45/100B, SJZ60/130, SJZ80/156, SJZ80/172 series extruder, the real test than the power of less than 0.1KW / (kg / h), in particular for - Following is a 250mm caliber material and efficient production of pipe. For the production of more than 350Kg / h over the pipe and profile extrusion production, usually the choice of more than 90mm in diameter to the different parallel twin-screw extruder, because at this time to the different level than the two-out double-cone machines cost more, and Two-out-the technology is more mature.
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For the PVC-U extrusion, and their selection of models and double-cone double the difference from a technical point of view it was long ago made a comparative analysis, the final decision or the decision by the user's preferences. From the effects of plastic, two-out-and dual-cone plastic extruder have different acts. Found in the feed, the efficiency of the two are the same; in the warm-up and pre-plastic materials, parallel twin-screw extruder has a serious shortage. The raw material is preheated by heat and friction materials and internal and external screw on the material Calendering role to provide heat, so dependent on the process of plastics materials and screw the contact area between the materials and the relative speed of the screw and the degree of compression of materials . At the same structure of the nuclear spiral, although parallel to the length of the screw in the feeding area than 60% of the long cone-shaped screw, but the heat transfer area while at the same time 45% of the small cone-shaped screw conveyor, the relative motion between the materials is greater than the speed of parallel Screw that the cone-shaped screw heat generated by the shear is greater than the parallel screw, so in the feed zone of conical twin-screw plastics material is superior to the role of parallel screw. In addition, the screw cone snail because of its trough in the volume of transportation in the process of constantly decreasing, which enhance the role of pressure, so that the screw with full access to materials, which tapered screw can provide high energy conversion, so that the pre-plastic is the better.
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In the measurement, screw on the one hand, to complete the plastic material, on the other hand, it must overcome the resistance to die. The cone-shaped screw, because of its relatively small diameter, through the accumulation of low energy, the pressure is relatively easy to set up and more stability, heat-sensitive PVC-U plastic processing temperature characteristics more suitable. The twin-screw-section measurement and plastics have a paragraph of the same amount of energy and thus have more energy and the need to screw the barrel to absorb the cooling system, so that the main electrical energy generated by a number of losing, raised more than power. For PVC materials, in the measurement, almost entirely because of plastics materials, require less energy, the excessive heat will speed up their decomposition, but a negative for plastics. Conical twin-screw in the above measures because of their smaller diameter, the material on the weaken shearing, shear heat generated by smaller, just to meet the PVC-U plastics extrusion. Therefore, relatively speaking, double-cone extruder of PVC-U products out of production should be more reliable and economic.
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Due to the little-screw conical smaller in diameter, produced by small back-pressure, at the same time, the cone axis of the screw into a certain angle, is easy to install rigid and strong bearing capacity of open bearings to offset the screw arising from the back Pressure and allow the use of simple and solid distribution gear, so double-cone extruder have a higher life and the maintenance of good performance.
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In the intensity of torque, also has a large cone-shaped screw advantage. We know that the plastic material from most of the energy needed to provide the screw, conical twin-screw plastics in the course of the input energy has a greater strength and stiffness, suffered less stress. For the same amount of extrusion, twin-screw cone in the strength and rigidity have a clear advantage.
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On the exhaust, because of the design of screw has been fully taken into account in the PVC extrusion process, the need to fully exhaust, are made of specially designed screw, twin-screw to the differences of the two models can meet Exhaust.
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The above analysis, we can consider economic factors on the premise of the choice of models to provide some help.
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Second, PVC-U extrusion process temperature control
PVC-U extrusion process temperature control is out of the most basic guarantee of the quality of products, in the actual operation of temperature control by setting the temperature, control and adjustment of the three parts. Temperature control and temperature settings are adjusted basis, to adjust the temperature is the temperature setting of the amendment and improvement to reach full temperature control is our purpose.
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2.1 Temperature settings
Set the temperature in order to control the materials out of the process, always in the melting temperature and decomposition temperature range (160 ~ 180 ℃) to carry out. To set the right temperature, you need to take full account of constraints and the impact of a variety of materials forming the temperature-related factors.
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1) The components of the formulation, dosage and quality of raw materials. According to the production of practical experience and the literature, different formulations of the same or different formula manufacturers of raw materials (PVC, CPE, thermal stability, etc.) plastics extrusion temperature very different, and some reach as much as 10-20 ℃ , In the absence of experience in the production or experimental conditions, such differences are often unpredictable. It is only through practice, in the performance test on the basis of summing up the appropriate adjustments and find out how effective the law and. Normally, the temperature is set from low to high and gradually.
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2) Plastics extrusion process of matching the energy. Out of the process is actually a balance with the energy released in the process, the same formula unit volume of material by melting into a solid state, the total energy required is relatively constant. The materials should be the basic rate of transmission of material balance in the melting rate, at the same time materials avenues of access to energy, Wu Waihu mechanical energy and geothermal energy, the distribution of the ratio of mechanical energy should be dominated by about 75-90%, from heating and Lo film Device-under-regulated energy to 10-15% is appropriate. As a result of equipment produced by manufacturers in the extruder design differences, the same formula in the extrusion process, the temperature settings are also evident
At the same time, the difference of material flow and cooling conditions and different specifications of the products unit of time out of speed is a clear difference, different transmission rate. Plastic materials need to match the thermal environment is different. Therefore, temperature settings
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It should take into account of the rate of extrusion products and specifications. General specifications for products greater the faster the rate of extrusion, with the temperature set should be higher.
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3) Plastic out of the course of time. In this process at different stages of the materials are out of shape and characteristics of different materials, and thus the decision to bear the heat and heat demand are also different. As we all know, in the materials out of the process, from the start I expected to head to the direction of the movement, usually by heating, process heat and temperature. One of the main zone heating and constant temperature in the extruder in order to exhaust the line and is divided into two mutually independent and associated parts of the district heating vents in the front (that is, one district and two districts); temperature region In the rear of the exhaust (that is, three or four); insulation from the head of the main zone, the transition and die components.
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District heating by compression, and transmission sections. Materials by the state at room temperature by the screw feed into the extruder screw conveyor, due to the large temperature difference, at the same time the material is compacted paragraph after the adoption of the exhaust. Extrusion process materials in the exhaust requirements of paragraph should be completed before the powder to the semi-solid state of melt into the process so that the coating material in the screw tightly, thus achieving an effective exhaust and not from the exhaust out of a large number of powder Expected, to plug the exhaust. Therefore materials in the district heating needs more heat, the temperature in the area should be set slightly higher to meet the rapid heat and add barrel temperature stable environment.
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District by the exhaust temperature measurement, and constitutes a paragraph. Materials by heating area already melting the basic state (or known as the semi-Plasticating state), but the material within the various parts of the melting temperature and the degree of uneven, the temperature needs to fully and plastics. With the spiral groove to reduce the volume and pressure in the head, the viscosity of the material and further improve the density, it is necessary to achieve the full state of plastics will take some heat, but in the area of the screw as a result of the cut material Cutting and rolling into the role of the heat, often exceeding the needs of the material, it is generally located in the area of heating and cooling system for the control of the barrel to maintain a constant temperature. In order to maintain the material in this range is not too much to heat up, some equipment manufacturers have set up a screw in the temperature control device, the material on the two-way temperature control can be more effectively to ensure that the normal materials and plastics extrusion.
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After the material has shown a constant temperature zone after the complete state of plastics, followed by the insulation material in the transition zone and die melt pressure on the Department set up to temperature, viscosity, density, more uniform, such as mobility, as well from the mouth Extrusion die in final preparation for the establishment of the melt pressure to a certain degree of energy consumption at the cost of the area as a result of heat no longer exists, it is still certain things need to add heat, so the heat insulation zone on the film set is essential.
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Based on years of production practices and user feedback, the conical twin-screw extruder, the temperature setting from the next Koudao expected to die right in general was left high-low "U"-shaped curve. Specific temperature settings should be based on specific formula and equipment to operate the technology-related factors, die, the cross-section shape of the complex, thick wall of products, temperature settings should be appropriate to raise.
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2.2 Temperature Control
General twin-screw extruder with both manual and automatic temperature control, the general state of the production, use of automatic temperature control function can be achieved. In the test formula and other non-normal conditions are often some of the larger range of temperature, time, the use of automatic control will not be able to achieve the purpose of control, manual control can be used to set the temperature control in temperature.
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The temperature control, there are two basic concepts: First, the control point shows that the temperature is actually barrel, and the head of the transitional body temperature, while the material is not the true temperature. Experiments have shown that the temperature of each barrel of deep 1mm can lower the temperature display close to 1 ℃; second, twin-screw on the material Calendering cut and the resulting heat is not subject to temperature control systems and disposable. In the extrusion process (that is, after the temperature balance) there is no heat and head of the transitional body temperature display, such as relatively stable, and near the temperature setting; and the heat generated in a section of the show as opposed to the temperature settings The temperature deviations are often larger. The design of the screw core temperature of the Department of extruder devices, temperature control is very reliable, and with higher accuracy.
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In fact, the temperature control is the main material temperature, rather than barrel, nose, mouth mode, the transitional body temperature, etc., only to ascertain the temperature of the material shows that the temperature in different temperature settings and situations out of the corresponding Relations in order to truly understand and control the temperature setting the basis and criteria.
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Twin-screw extruder is expected to have a mandatory feature of the size of its extrusion capacity is determined by the speed of feed, feed speed and speed crowding there are also matches the corresponding relations. Twin-screw extruders in general the "hunger" feed, observation from the exhaust, usually in order to increase to a spiral groove 1 / 2 to 2 / 3 is appropriate. At the same time, should observe the main driver of the electrical current changes in the nose and show the pressure changes in the relationship, stability and the current head out when the pressure should be very stable. With good plastic, the current head pressure are relatively stable; if not good, then head to increase the pressure fluctuations in electrical current and increasing instability. As a result, actual production will usually host and current head of the pressure changes in the judge as out of temperature control is an important basis for appropriate.
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2.3 temperature adjustment
As already mentioned, the temperature plastics materials by a variety of factors and the effects of temperature settings in the boot, it is inevitable that some of the deviations in order to ensure the quality of the products out, through analysis of the quality of the products in a timely manner should be set for Adjust the temperature.
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The quality of the material of the general appearance is divided apparent and inherent quality. In the statistics show that the profile of the general quality of the appearance of the nose by the transition, I-mode sites, such as improper temperature setting and mode shape of the surface caused by bad; and generally rests with the intrinsic quality of the extruder with the temperature above Improper control or out of control and causing a certain temperature. In practice, therefore, should be targeted in a timely manner to adjust the temperature setting of up to pass out which products. Can not be blind to adjust the temperature or substantially worsened by working to increase the loss of waste.
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Third, the mixing process on the quality of extrusion profiles
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PVC-U products out of the molding process, material and technical conditions change is very complex, in order to be satisfied the quality of the products are often out of the machine attached great importance to the use of, and the mixture of quality control is obviously not pay enough attention . However, from the theoretical and practical evidence, it shows that the distribution of material mixing process is very important. Quality of the mixture of pros and cons will have a direct impact on the quality of the products out because of the different twin-screw extruder mixed mixing function is very weak, and it's greatest strength is a function of the material as if the pump is the same Transportation displacement, only because of its design space of four (screw with the barrel of space, the side of the gap between the screw, rolling space, space tetrahedron) the existence, it was mixed with a certain degree of mixing effect . That is why before setting out in the allocation process mixture of root cause of the problem. Therefore, the mixture must be allocated in strict accordance with the formula and process requirements.
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According to the production of a number of practical experiences, in view of mixture distribution process requires the following for reference:
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3.1 ingredients must be in strict accordance with the formula set forth in doses of ingredients, more or less is not allowed.
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3.2 Hot compounding
Room temperature by the suspension system for the production of PVC powder particles of a size, small particles more easily in the extrusion process of plastics produced uneven. PVC-U in the high-speed mixed powder, they are to be granules and re-refining portfolio. When the temperature reaches about 120 ℃, the trail is expected to become large and uniform, small particles gradually disappear, and some of the produce Gelation, caused by dense, so as to enhance the production of extrusion, extrusion process in favor of uniform plastic. Some of the gel-based materials would speed up the plastics extrusion process.
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PVC-U powder mixture on the surface of the particle density and also with the temperature change, as long as 110 ~ 120 ℃ in the range of high-speed hybrid, a considerable part of the additive will melt here, so easy to reach and improve the densification Production, some of which enhance the quality of the gel.
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3.3 Mixed cold
Heat the mixture will have PVC-U materials for the purpose of the cold mixture is quick to state the high-temperature materials for cooling in order to prevent the accumulation of material internal temperature rise too high, and the emergence of the yellow materials break down. Hybrid cooling, it is important to ensure that the cooling water temperature at 15 ~ 20 ℃ below.
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Cold mix of materials must be below 45 ℃ off to prevent the material as a result of internal heat and the poor so that the re-temperature decomposition.
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3.4 mixture should pay attention to:
1) input: hot mix, the volume of investment is generally mixed hot cylinder volume of 50 to 70% at this time somersault in good materials, high efficiency, rapid warming; less than 50%, heating up fast; more than 70% , The slow somersault materials, the load is too large, the speed dropped to the disadvantage of mixed quality; general state input is mixed hot cylinder volume of 60% effective.
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2) the temperature of equipment to direct accurate temperature sensor should be fully inclusive materials, attention should be paid to carry out regular checks of thermocouple temperature to prevent excessive wear and tear as a result of its materials measurement are not allowed to make.
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3) Strictly speaking, is expected to vote about the right to order and can not be taken to the main cast along with accessories. Lubricant should not be put outside early, is expected to vote in general order of PVC, stabilizer, in lubricants, processing aids, fillers, lubricants outside, Lou titanium dioxide into the final. However, in practice, most manufacturers have adopted the same time feeding methods, processes and the impact on the performance of the final product is at present no reliable evidence, and therefore it is necessary to ask the industry experts through a scientific test to determine.
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If the mixture in the process of the order is expected to vote first, the heat mixed open devices must be separate accessories and small mouth I expected to meet the technological requirements of the distribution mix.
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The use of mixing equipment, there are more than cold-mix separate mixture of hot and cold better mix of high intensity mixing machine such as the one the machine Fukuda HL1000, its thermal design of mixing leaves home for the high-strong hybrid (Kneading) and the role of all, the material mixed in the process of completely relying on material from the friction between the collision and the role of up to the required temperature of the mixture, rather than plus auxiliary heating device to heat up, than buy low-quality leaf design of mixing more Fine. At the same time, heat directly into the mix after the end of the cold mix, no order to ensure the efficiency and quality of the mixture is about quality at the same time, demands a certain flexibility of the production process with the mixture of products preferred equipment manufacturers.
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Fourth, at home and abroad brief profile extrusion equipment and purchase Notes
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Since the 1980s, a number of enterprises in China from foreign companies to introduce a number of PVC-U profiles and pipe production line, different to the twin-screw extruder to Milakelang • Cincinnati (CM), Claus • Mary Philippines (KM), Weber (WB), Tyson, Taikepasi Davis • Standard, A Ketuo, Bao Shan Hospital, and so on Europe and the United States on behalf of the company, and auxiliary material to mold the company Ge Ruina Tyson, and on behalf of the company.
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Conical twin-screw extruder to introduce the main specifications: 40/85, 45/90, 45/97, 50/108, 51/105, 55/110, 58/125, 60/125, 63/130, 65/132, 68/147, 80/143, 80/156 and a considerable part of the big differences to the two-level specifications extruders e.g.93,112,132.
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4.1 Overall situation, vary the domestic twin-screw extrusion technology to the development of a number of obvious characteristics:
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1) Double Cone-efficient design of the screw has begun to gradually replace the ordinary super-screw conical, such as 45/90, 55/110, 65/132, 80/156, 92/188, and other specifications of conical twin-screw extruder Machine in recent years the introduction of the equipment has been extremely rare, out of more efficiency and at the same time different to the dual-use PVC-U extrusion with more than 90mm of most models are out for large volume production.
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2) Screw core temperature of the Department of ways other than the main way to control oil temperature cycle: barrel used to cool air in order to improve on the formula of adaptive devices and equipment for the reliability of the development.
3) The power transmission system Gearbox combined with the distribution box, so to shorten the chain of transmission will help drive efficiency and reduce noise and reduce the corresponding area.
4) line of automation becoming more and more advanced control. Have been gradually separated from control components toward more advanced PCC intelligent man-machine interface and industrial computer control to focus the direction of development, the main, auxiliary control and free combination synchronized control of the entire communication and control of development have become an inevitable trend. Especially for large-scale extrusion manufacturer volume products, the degree of automation to improve plant production system is conducive to the realization of centralized control and intensive production, reduce production costs.
5) the quality of the plastics extrusion machines and production equipment to an earlier been markedly improved, more efficient production.
6) Auxiliary domestic profile to the current Ge Ruina companies like Tyson and the company's improved version of the two models represented by models, the auxiliary pipe to the company's model-based KM. From the structural form, like Ge Ruina products for the built-in structure, and the cooling rack placed in a vacuum system in-house, almost all components are placed inside the rack. Pipe rack in a variety of complex systems, and more components, within a small space, adjust maintenance is very inconvenient. However, a high degree of operating a low, look more pleasing shape; traction and cutting can synchronize the mandatory for the length of the size of the control section, compared with a simple adjustment. Tyson-like auxiliary, the use of external structure, its shape using a vacuum-owned structure, intuitive interface, a direct outlet to cool in the table, and stereotypes die when the connection is more convenient, very simple and practical; outlet in the table to avoid A leak of cooling water, place the remaining components within the rack, a relatively large space, maintenance is more convenient; traction, cutting synchronize the mandatory mechanical, stepless adjustable pressure and stereotypes Taiwan and vacuum traction table for the connection between the Associated with the rack, forced an excellent situation, the stability of the Auxiliary advantage.
In general, these two models focus on the appearance of a form, and a focus on practical performance, have their own characteristics, not in this list. In comparison, the Tyson-Auxiliary is more practical. Ryder currently YF240C-developed machine that takes care of the two auxiliary units of the advantages of both beautiful and practical, universal table, the adjustment to achieve electrical operation, reducing labor intensity, is a high cost of auxiliary equipment.
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4.2 In recent years, through the application of survey, we found that PVC-U extrusion products for manufacturers of equipment out mainly in the following requirements:
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1) Out of high-yield and stability. To facilitate the realization of high-speed extrusion, and it is in the same consumption for obtaining greater efficiency.
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2) Good quality plastics. For a variety of formulations adaptable is to meet the production profile of a variety of quality requirements.
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3) Temperature control and high precision, small deviation, high sensitivity, temperature control and at the same time more convenient to adjust.
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4) Low energy consumption. In the profile extrusion business, and its costs, in addition to raw materials, power consumption costs account for a large part to lower energy consumption is to reduce costs.
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5) The safe operation of the control convenience, ease of control. Auxiliary sync with the main control and adjust the control of the entire communication is very urgent requirements, in particular, a number of large enterprises, control systems have become increasingly demanding, the current PCC intelligent control system has reached world advanced level in line with the requirements of To meet the plant's intelligent control and intensive production.
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6) To facilitate maintenance. In addition to equipment maintenance requirements of its own convenience, from the formulation process, the structural design of products such as the technical aspects of the full support of the majority of the production plant is also an urgent desire.
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4.3 Based on the above, I suggest users to purchase equipment, pay attention to the following:
1) Out in the choice of models, the screw should be noted that preferred ultra-high-performance two-cone structure to meet the needs of low-power high-yield. If the profile extrusion, such as profiles for the big box in the club should be selected out of stability in the amount of 160 ~ 280Kg / h of equipment, some manufacturers currently more than 60 of the extruder can meet this requirement, the amount of out in the 300Kg / h more than one mode proprietor of dual-chamber profile, high-speed extrusion, optional 80/156 or 80/173 dual-cone extruder and 110mm around the two-level extruder; for the fans, and other materials of the middle section profiles , The choice should be stable in the production of 80 ~ 100Kg / h of the extruder; for small gland, layering and so on are advised to choose a stable production in the 50Kg / h around the extruder, it should be noted that the host's power consumption targets. For 75mm tubes out of the following should be selected 100Kg / h or so-55/110 extruder; for the 50-160mm-wide pipe can be selected out of 200Kg / h to about 65/132 of similar models of the extruder; The 160-250mm out of the tube should be selected 300Kg / h to about 80/156 of similar models of the extruder, and so on.
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2) The accuracy of temperature control option is out of line to consider another major factor. The temperature control accuracy a direct impact on the quality of extrusion profiles. Judging from the current situation, the Ministry of Oil using screw core temperature cycle structure of the extruder, its temperature better than self-regulated screw extruder devices, this is a production proven fact. At the same time, using screw core temperature cycle of the Ministry of Oil structure of the extruder, the screw is the temperature requirements of different processes can be adjusted, so that the plastic quality control has become more convenient, since the thermostat does not screw Characteristics.
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3) Pay attention to operation and control of the security and convenience. Equipment should be in line with national safety standards for the industry's request, no leakage, anti-misoperation. The PVC-U extrusion, that is, to the extruder to adjust the parameters, but also on stereotypes, such as traction and cooling parts of the corresponding adjustment in order to achieve the entire extrusion process parameters and coordination of the match. Therefore main Auxiliary should be required to set up synchronous speed in order to ensure simultaneous adjustment across the board, make it easier to operate and improve productivity.
4) in the PVC-U products out of the production process, as more die on the same extruder, may be changed frequently die, every time the necessary adjustments so that the extrusion process to maintain a good state. To reduce the mold for lower productivity brought about by the proposed allocation of each line up to 3 more die following the economy. PCC to control the use of smart memory can be 1,000 different parameters of the process under the formula and specifications may die, according to the use of empirical data, automatic die out in the work of the state of the best out of the process parameters and conditions of this process Run. Of course, we can adjust the process to amend or delete a formula so that the extrusion process of adjustment easier, so that's out of the realization of fully automated production possible. Among the available communication can be squeezed out all the focus on remote monitoring equipment. On the scale in order to seek effective use of such devices is still the best.
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5) production in certain circumstances, as far as possible to choose an installed capacity of the smaller extrusion equipment, that is, as far as possible to lower power than out. For example, the current profile extrusion for the two-cone extruder main drive for power 11KW (35/75 extruder), the stability of production in the 55Kg / h or so; the main driver for the power 37KW (65/120 and 65 / 132), both production and stability in the 180Kg / h or so, the main driver for the 30KW of power SJZ60/125 extruder, the stability of its output of up to 150Kg / h or so. Contrast can be found in the machine's power utilization efficiency is different, so the choice of models is very important.
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6) has a good after-sales service system. Ligand supply a timely manner, fair prices, pre-sale, sale, after-sales service of the rapid reaction security system, to help users solve the purchase of equipment after all the technical problems encountered.
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7) be able to provide users with a more practical formulation of economic system and the structural design of products and provide investment advice or plant design, equipment suppliers with the overall quality and strength, users purchase the equipment at the same time, we should also think of the question.
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Five, out of the development trend of technology
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After PVC-U extrusion technology and explore the theory of initial production in recent years, the practice of summary and found that different to the twin-screw extrusion technology following the development trend in this together for reference.
5.1 applications continue to expand (food, paper, explosives), so that the plastics extrusion technology has shown to the general trend of technological development.
5.2-to-date with modern scientific research, including information technology, materials technology and the organic integration, plastics extrusion technology with high-tech start of the characteristics of the technology.
5.3 Kwan main theoretical breakthrough technology and application of the technology continue to rise, as well as a growing intensity of competition in the market, so that the technology out to the "three high and one low," that is, high reliability (safety, quality), efficiency (automation, low-power , High yield, no remote monitoring of production, dynamic out), precision (out of precision, micron processing technology, nanotechnology), the use of low-cost (maintenance-free) direction.
5.4 As the technology is similar to the high principles and functions of the degree of improvement to make plastics extrusion technology to the start of the general technology of highly integrated and efficient combination of (a dual-chamber die out, multi-out, composite out) direction .
5.5 As the raw materials and modified formula of high technology development, leading to the extrusion technology with the application of new materials in the field of application of an extension of the continued expansion of extrusion technology led to the emergence of functional specialization and diversification in the near future.
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