1. According to the fault occurrence status, it can be divided into:(1) Gradual failure. It is caused by the gradual deterioration of the initial performance of the injection molding machine. Most of the failures of the injection molding machine belong to this type of failure. This type of failure is closely related to the process of wear, corrosion, fatigue and creep of electronic control and hydraulic mechanical components.(2) Sudden failure. It is caused by various unfavorable factors and accidental external influences, which are beyond the limit that the injection molding machine can bear. For example: the screw is broken due to the overload of the iron material in the barrel; the electronic board of the injection molding machine is broken due to the high pressure. Such failures often happen suddenly, without any prior warning.Sudden failures mostly occur in the use phase of injection molding machines, and are often caused by defects in design, manufacturing, assembly, and materials, or operating errors or illegal operations.2. Divided by the cause of the failure, it can be divided into:(1) Abrasion failure. Failure due to normal wear and tear of the injection molding machine.(2) Misuse failure. Failure caused by incorrect operation or improper maintenance.(3) Inherent weakness failure. Due to design problems, the plastic injection molding machine has weak links and malfunctions during normal use.3. According to the nature of the fault, it can be divided into:(1) Intermittent failure. The injection molding machine loses some of its functions in a short period of time, and it can be restored after a little repair and debugging, without replacing parts.(2) Permanent failure. Some parts of the injection molding machine are damaged and need to be replaced or repaired before they can be used again.4. Divided according to the danger of the fault, it can be divided into:(1) Dangerous failure. For example, the safety protection system loses its protective function due to failures when it needs to act, causing personal injury and injection molding machine failure; failures caused by the failure of the hydraulic electronic control system.(2) Safety failure. For example, the safety protection system will act when no action is required; the servo injection molding machine will fail to start when it cannot be started.5. Divided according to the degree of failure impact, it can be divided into:(1) Complete failure. Cause the china injection molding machine to completely lose function.(2) Partial failure. Some functions of the injection molding machine are lost.6. According to the occurrence and development rules of injection molding machine failure, it can be divided into;(1) Random failure. The time of failure is random.(2) There are regular faults. The occurrence of failures has a certain pattern.Each type of failure has its main characteristics, the so-called failure mode, or failure state. The failure status of various injection molding machines is quite complicated, but it can be summarized as follows: abnormal vibration, mechanical wear, input signal can not be accepted by the computer, solenoid valve no output signal, mechanical hydraulic components broken, proportional linear imbalance, hydraulic pressure Pressure drop, hydraulic leakage, oil pump failure, hydraulic noise, circuit aging, abnormal sound, deterioration of oil quality, power supply pressure drop, no output of amplifier board, temperature out of control and others. The proportions of various failure modes of different types of pet preform injection molding machines are different.
1.To choose an injection molding machine with a capacity equivalent to that of the injection molded product, if the injection molding machine has problems such as material dead ends, it is best to replace the equipment. For the mold casting system, exhaust grooves, etc., which can cause color difference, it can be solved by the maintenance mold of the corresponding part of the mold. The problems of injection molding machines and molds must be solved before the production can be organized to reduce the complexity of the problem.2. Eliminate the influence of raw resin and color masterbatchControlling raw materials is the key to thoroughly solving color differences. Therefore, especially in the production of light-colored products, the obvious influence of the thermal stability of the raw material resin on the color fluctuation of the product cannot be ignored.3. Eliminate the influence of uneven mixing of color masterbatch and masterbatchPoor mixing of plastic masterbatch with color masterbatch will also make the product color volatile. After the masterbatch and the masterbatch are mixed uniformly, when they are fed into the hopper through the lower suction, the masterbatch is separated from the masterbatch due to the electrostatic effect and easily adsorbed on the hopper wall. This will inevitably cause the change of the amount of the masterbatch during the injection cycle, which will cause Chromatic aberration.In this case, the raw materials can be sucked into the hopper and then manually stirred. For adding colored toner to produce colored products, the most effective method is not to use a suction machine, but to use a hot air dryer, using artificial feeding to prevent the color difference caused by the separation of toner from the masterbatch.4.Reduce the impact when adjusting the injection molding processWhen it is necessary to adjust the pet preform injection molding process parameters for non-color difference reasons, try not to change the injection temperature, back pressure, injection cycle and the amount of color masterbatch. At the same time, adjust the process parameters to observe the impact of color changes. If you find that the color difference should be adjusted in time.As far as possible, avoid using high injection speed, high back pressure and other injection molding processes that cause strong shear, and prevent color differences caused by local overheating or thermal decomposition. Strictly control the temperature of each heating section of the barrel, especially the nozzle and the heating part close to the nozzle.
1. SpeedA. Speed setting of mold opening and closing. The setting of mold opening and closing is generally based on the principle of slow-fast-slow. This setting mainly considers the plastic bottle injection molding machine, mold and cycle.B. Ejection setting: It can be set according to the structure of the product. It is best to use a slow ejection speed for some complex structures, and then use a quick demold to shorten the cycle.C. Fire rate: Set according to the size and structure of the product. If the structure is complicated and the wall is thin, it can be set quickly. If the structure is simple, the wall thickness can be set slowly.2. TemperatureA. Oil temperature: For the hydraulic machine, it is the thermal energy generated by the friction of the hydraulic oil during the non-stop operation of the blow molding machine. It is controlled by the cooling water. When the machine is turned on, make sure that the oil temperature is around 45 ° C. Or too low will affect the transmission of pressure.B. Material temperature: the barrel temperature. This temperature should be set according to the shape and function of materials and products. If there is a file, set it according to the file.C. Mold temperature: This temperature is also an important parameter. Its level has a great impact on the performance of the product, so the function and structure of the product must be considered when setting, and the material and cycle must also be considered.3.PressureA. Injection pressure: According to the size of the product, the thickness of the wall, from low to high, other factors are considered when debugging.B. Holding pressure: The holding pressure is mainly to ensure the product's shape and stable size. The setting should also be set according to the structure and shape of the product.C. Low pressure protection pressure: This pressure mainly protects the mold and minimizes the damage to the mold.D. Clamping force: It refers to the force required for the mold to close the mold. Some injection machines can adjust the clamping force, and some cannot.4.TimeA. Shot time: This time must be set longer than the actual time, and it can also protect the shot. The shot time setting value is about 0.2 seconds greater than the actual value. When setting, you should consider the pressure, Speed and temperature.B. Low voltage protection time: In the manual state, first set the time to 2 seconds, and then add about 0.02 seconds according to the actual time.C. Cooling time: This time is generally set according to the size and thickness of the product, but the melting time should not be longer than the cooling time, which can fully shape the product.D. Holding time: This time is the time for cooling the gate before the melt is allowed to flow back under the pressure of holding pressure to ensure the size of the product after the injection is completed. It can be set according to the size of the gate.5.LocationA. The opening and closing position can be set according to the corresponding opening and closing speed. The key is to set the starting position of the low pressure protection, that is, the starting position of the low pressure should be the point that is most likely to protect the mold without affecting the cycle, and the ending position. Should be the position where the mold contacts before and after the mold is closed at a slow speed.B. Ejection position: This position can meet the complete demoulding of the product. Firstly, it should be set from small to large increments. Note that the back position must be set to "0" when the mold is installed, otherwise the mold will be easily damaged.C. Melt position: calculate the material quantity according to the product size and screw size, and then set the corresponding position.D. The V-P position should be found from short to large, that is, the Short-Short method to find the V-P position (that is, the V-P switching point).Hisson Plastic Machinery Co., Ltd. is a injection moulding machine manufacturer of high-performance plastic injection molding machines and PET bottle blow molding machines.Our injection molding machines from 96T to 1250T clamping force, are exporting to many countries include European countries, Australia, Middle East, Africa etc., now energy saving is popular, more than 60% of the machines we made are servo motor machines. In PET bottle field, we have abundant experience, we have special PET preform injection molding machine, semiauto and automatic PET bottle stretch blow molding machine, we have 2-cavity, 4-cavity and 6-cavity automatic PET bottle blow molding machines.With cooperation with manufacturers of high quality preform mold, blow mold, cap mold and auxiliary equipment, we provide complete production line for PET preform injection and bottle blowing.We provide 2D and 3D design service for PET preforms and PET bottles, according to samples, design draft or only idea.
According to the data, although the development of the plastics industry in Thailand is limited, the investment in blow molding machine has reached more than 1 billion US dollars in the past 10 years, and the market prospect of plastic machinery is promising. In order to continuously produce various modern products, the Thai plastics industry must update its equipment and introduce advanced technology to compete with injection moulding machine manufacturer in other countries and regions.At present, the Thai plastics industry can only provide general household plastic products, and it will continue to increase investment in the future. According to the Thai Plastics Corporation, the future investment in equipment for the Thai plastics industry will cost approximately US$2 billion. This shows that there are huge business opportunities in the plastic machinery market in Thailand. The chairman of the Thai Plastics Association said that there is currently no plastics company investing in modern high-quality blow molding machine, and the country's mold factory is also lagging behind the world. Under this circumstance, many Thai plastics companies have realized the existence of the crisis and began to enter the overseas market to invest in high-tech equipment.In 1995, the Thai government began to encourage the development of the plastics industry, which has become one of the fastest growing industries in the past few years. At the same time, "2010 Thailand Plastic Industry Development Plan and Vision 2020" will focus on household products and high-tech products as the development of the plastics industry. It is also expected that the annual growth rate of consumption in Thailand will be around 25%~30% in the future. Plastic consumption will reach 50 kg or so. In 2016, Thailand's plastics export volume will reach 500,000 tons. In the next few years, the plastics industry in Thailand will have a big development.First of all, China's plastic machinery enterprises have a certain strength after years of development. Compared with the products of international large enterprises, China's plastic injection machine are mainly in terms of cost performance. China's products are lower in price and can be more widely used. Secondly, the establishment of the Chinese enterprises has been reduced. Secondly, the establishment of the China-ASEAN Free Trade Zone has reduced the tariffs on China's exports to Thailand. In January 2007, Thailand's accession to the WTO also provided business opportunities for the export of China's plastic machinery products to Thailand.In order to expand the sales share in the domestic and foreign markets, Thai plastic companies have increased their investment and increased their business scale. Due to the backward development of Thailand's industry, especially the backward development of machinery manufacturing industry, Thailand's plastic machinery and equipment needs to be imported in large quantities, providing an opportunity for China's plastic machinery products to be exported to Thailand.