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Join Ningbo Haijing Plastic Machinery at CHINAPLAS 2026!   Great news! Ningbo Haijing Plastic Machinery Co., Ltd. is thrilled to exhibit at CHINAPLAS 2026—Asia's largest & world-leading rubber & plastics trade fair !   Date: April 21–24, 2026  Venue: National Exhibition & Convention Center (Hongqiao), Shanghai  Booth:  2.1F121 Contact: Mandy Chen +86 159 5748 6432 (wechat&whatsapp)   What We’ll Showcase   - Energy-Saving Injection Molding Machines  - High-Precision Horizontal Vertical Models & Double color machine - Special Machines for medical, packaging, automotive & custom solutions - Smart & Stable Performance with CE & ISO9001 certifications   Why Visit Us?   ✅ 20+ Years Expertise in plastic machinery manufacturing ✅ Customized Solutions for global clients ✅ Competitive Pricing & Reliable After-Sales Service ✅ Live Demos & Technical Talks with our engineers   Meet our team, explore innovations, and discuss your production needs! We look forward to connecting with partners worldwide.   See you in Shanghai!

Process stability monitoring is a crucial aspect of any operation, ensuring that potential issues are identified early on and appropriate action is taken to prevent any negative impact on the overall process. By monitoring the stability of a process, organizations can proactively address any deviations or abnormalities before they escalate into major problems. The process stability monitoring involves the continuous tracking and analysis of key performance indicators to identify trends, patterns, and anomalies that may indicate potential issues. By setting up alerts and thresholds, organizations can receive early warning signals when certain parameters deviate from the expected norms, allowing them to intervene and make necessary adjustments before it's too late. One of the key benefits of process stability monitoring is the ability to detect issues early on and prevent them from escalating into larger problems. By identifying and addressing potential issues at an early stage, organizations can minimize downtime, reduce waste, and improve overall efficiency. In addition to identifying potential problems, process stability monitoring also allows organizations to track performance over time and make data-driven decisions to optimize processes and improve overall performance. By analyzing historical data and trends, organizations can identify areas for improvement and implement targeted interventions to drive continuous improvement. Furthermore, process stability monitoring can also help organizations meet regulatory requirements and ensure compliance with industry standards. By monitoring key performance indicators and ensuring that processes are stable and consistent, organizations can demonstrate their commitment to quality and compliance, reducing the risk of fines, penalties, and reputational damage. Overall, process stability monitoring is a critical tool for organizations looking to optimize their operations, improve efficiency, and mitigate risks. By finding potential issues, issuing early warning signals, and intervening early, organizations can ensure that their processes run smoothly and effectively, ultimately leading to better outcomes for both the organization and its stakeholders.

Dear Valued Customers, As the Mid-Autumn Festival approaches, we would like to inform you that our company will be closed for the holiday from September 15th to September 17st. However, we will have a team of dedicated staff on duty to ensure that any urgent matters are attended to promptly. May the full moon bring you and your family good fortune and happiness. Sincerely, yours NINGBO HAIJING PLASTIC MACHINERY CO.,LTD.

According to data released by the National Bureau of Statistics, the production of plastic products in China in July was 6.319 million tons, a year-on-year decrease of 4.6%. From January to July, the production of plastic products was 42.012 million tons, a cumulative decrease of 0.3%

HAIJING with over 20 years of experience in the industry, the company has established a strong reputation for delivering high-quality machines that meet the diverse needs of its customers. In 2024, HAIJING will be showcasing its latest innovations and technologies at the CHINAPLAS exhibition. CHINAPLAS is one of the largest and most influential plastics and rubber trade fairs in the world, attracting thousands of exhibitors and visitors from around the globe. At the exhibition, HAIJING will be presenting its double color plastic injection molding machines, which are designed to cater to various industries such as automotive, packaging, electronics, and medical. These machines are known for their precision, efficiency, and reliability, making them the preferred choice for many manufacturers. One of the highlights of HAIJING's booth 5.1G12 at CHINAPLAS will be its advanced servo-hydraulic injection molding machines. These machines are equipped with state-of-the-art technology that allows for precise control of the injection process, resulting in high-quality and consistent finished products. The servo-hydraulic system also helps to reduce energy consumption, making it an environmentally-friendly option for manufacturers. In addition to injection molding machines, HAIJING will also be showcasing its auxiliary equipment, such as robots and automation systems. These equipment are designed to enhance the efficiency and productivity of the injection molding process, allowing manufacturers to streamline their operations and reduce costs. Furthermore, HAIJING will be introducing its smart manufacturing solutions at the exhibition. These solutions leverage the power of artificial intelligence and data analytics to optimize production processes and improve overall manufacturing performance. With HAIJING's smart manufacturing solutions, manufacturers can achieve greater operational efficiency, reduce downtime, and enhance product quality. Visitors to HAIJING's booth at CHINAPLAS will have the opportunity to learn more about the company's products and technologies through live demonstrations and interactive displays. Welcome to our booth:5.1G12!

Today is Thanksgiving day in China. It is a holiday created by the American people, and it is also a holiday for the American family to get together. At first, there was no fixed date for Thanksgiving, and it was decided by each state on an AD hoc basis. It was not until 1863, after the Independence of the United States, that President Lincoln declared Thanksgiving a national holiday. [1] In 1941, the U.S. Congress officially designated the fourth Thursday of November as Thanksgiving Day. The Thanksgiving holiday usually lasts from Thursday to Sunday. In 1879, the Canadian Parliament declared November 6 to be Thanksgiving Day and a national holiday. In subsequent years, the date of Thanksgiving changed several times, until on January 31, 1957, the Parliament of Canada declared the second Monday in October as Thanksgiving Day every year. In addition to the United States, Canada, Egypt, Greece and other countries in the world have their own unique Thanksgiving, but the United Kingdom, France and other European countries are insulated from Thanksgiving. Some scholars also proposed the establishment of a "Chinese Thanksgiving Day" to promote traditional culture.

Mexico Rubber and Plastics Exhibition in November

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COME&VISIT CHINAPLAS 2023 INVITATION LETTER DATE:2023.4.17~4.20 ADD:SWECC,SHENZHEN BOOTH NUMBER:10D51 TEL:0086057462516518

Many molds, especially thermoplastics for molding engineering, operate at relatively high temperatures, such as 80 degrees Celsius or 176 degrees Fahrenheit. If the mold is not insulated, the heat lost to the air and the injection molding machine can easily be as much as the injection cylinder. Therefore, the mold should be insulated with a skeleton board, and if possible, the surface of the mold should be insulated. If you consider using a hot runner mold, try to reduce the heat exchange between the hot runner portion and the cooled molded part. This method reduces energy loss and warm-up time. What are the effects of mold temperature on injection molding? Mold temperature is the most important variable in injection molding. No matter what kind of plastic is injected, it is necessary to ensure that the basic wetness of the mold surface is formed. A hot mold surface keeps the plastic surface liquid for a long time, enough to build up pressure in the cavity. If the cavity is filled and the cavity pressure presses the soft plastic against the metal before the frozen skin hardens, then the reproduction of the cavity surface is high. On the other hand, if the plastic entering the cavity at low pressure is suspended, no matter how short, then its slight contact with the metal will cause a stain, sometimes referred to as a gate stain. For each type of plastic and plastic part, there is a limit of mold surface temperature beyond which one or more adverse effects may occur (for example, components may spill out of burrs). Higher mold temperatures mean less flow resistance. On many injection molding machines, this naturally means faster flow through the gate and cavity, because the injection molding flow control valve used does not correct this change, and faster filling causes a higher effective pressure in the runner and cavity, which may lead to overflowing raw edges. Since the hotter mold cavity does not freeze the plastic that enters the overflow area before the high pressure builds up, the melt can overflow (the raw edge) around the ejector rod and spill into the gap between the dividing lines. This indicates the need for good injection rate control, and some modern flow control programmers can indeed do this. Generally, the increase in mold temperature will reduce the condensation layer of the plastic in the cavity, making it easier for the molten material to flow in the cavity, thereby obtaining greater part weight and better surface quality. At the same time, the increase in mold temperature will also increase the tensile strength of the parts.

Reason 1. Time to keep the mold open 2. Pressure instability 3. Barrel temperature is not consistent 4. Mold temperature inconsistency 5. Feed instability Corresponding measures 1. Keep the mold open time: Maintain fixed cycle times for varying lengths of time using a die opening timer 2. Pressure instability: Maintain sufficient pressure to keep the discharge consistent Check the pressure system for oil leaks 3. Barrel temperature is inconsistent: Check the temperature control system to maintain normal operation Use the best temperature control system Check the voltage and stabilize it Make sure the heater is working properly Before material is added to the hopper, the temperature of each barrel of material should be maintained at the same level The amount of material at the front end of the plunger should be maintained in a consistent manner The machine should be maintained in a balanced condition 4. Mold temperature is inconsistent: Using a mold temperature controller There should be a proper channel in the mold The mold should have a proper exhaust pipe Usually the water pipe in the mold should have an appropriate connection 5. Unstable feeding: Check feeding mechanism

In the injection molding process, how should the delay valve and speed match? Let's take a look at this case today. This product is a car rear bumper, it has a lot of gate, using delayed sequence valve to shoot glue, this product has nine gates, from the middle one, and then to the two sides of the row of 4, this product is prone to a lot of problems, such as tiger skin grain, flow pattern, air pattern, size problem, today those questions do not talk about, we only talk about one drum problem. After this product will spray paint, but after painting will find a problem is the drum bag, the surface is like the field ridge drum bag, and then we found out that this is the reason? This is a drum bag at the junction of two different streams of material, so you might ask, if it's a delay room, how can there be a connection line? Yes, the delay valve is not connected to the line, the middle valve is opened first, the second valve is opened later, when the material of the first valve comes here, the second valve needle is passed, the second valve needle is opened again, and then, the third is the fourth. The position of the drum occurs in the edge area, that is to say, after the last valve needle is opened, and the material in front will form a joint line in the center, not on the surface, but on the combination line of the heart, this combination line will have a drum on the surface, so what about this drum? Picture This method is not the same as the adjustment of other conventional products. We use a pure injection molding process. Specifically, to solve the drum problem, the core of its solution is to reduce the speed of the glue. For the vicinity of drum defects, we should reduce the speed of glue injection, specifically, the whole product, if there is a drum bag, is in the second half. In the first half, it is not easy to have drum defects, and our speed is also higher. Generally speaking, like this product PP material, the wall thickness is about 2.7 to 3.0 degrees, then our mold temperature is about 20 to 30 degrees, the material temperature is 230 degrees, that is, the shooting speed is in the first 70 percent, from here to here 70 percent, our shooting speed is controlled at 30 percent ≤ 40 percent. When it comes to the place where bulging is easy to appear in the second half, the shooting speed will be controlled between 5% and 10%. If the drum is more severe, the speed should be lower, say, 5%. If the drum is not strong, the shooting speed can be higher, for example, that is, 10% of the shooting speed, so that the defect of the drum can be alleviated with the low shooting speed.

Appearance method: Appearance identification is mainly through vision, touch, smell and so on to observe the appearance characteristics of plastic products, such as the shape, transparency, color, luster, hardness and so on. Plastic after recycling and reprocessing process, color, luster, strength and so on will change, no return color will generally be more transparent, mixed with return products will reduce transparency; the luster of the return material is poor; experienced old injection molding personnel can use tooth bite to initially determine the strength of the plastic, with the addition of the return material is more brittle. The external method is generally used as a preliminary identification of plastic returns. Physical performance test method: The density of different kinds of plastics is usually quite different, and the density difference of the same kind of plastics before and after recycling will also be quite different. The density method can be used to identify the plastic return, but it can not be used to judge the plastic return completely, because there will be many voids or other defects in the process of plastic recovery and reproduction. For example, the regeneration process of ABS/PC produces a lot of small pores, and the number of holes increases with the increase of regeneration times. For impact strength, tensile strength, compression strength, bending strength and other strength properties, with the increase of plastic content, there will be a significant decrease trend, especially the tensile strength and bending strength will decrease obviously. The decrease of these strength properties is closely related to the formation of voids and the decrease of defect and molecular weight in the process of recycling. Therefore, for the identification of plastic return, these strength properties of plastics can be tested, and whether the product contains backfill can be preliminarily determined by comparison. Dissolution method: Different plastics can be identified by the solubility of plastics in different organic solvents, and plastic returns can also be identified. Because it is difficult to achieve high purity in the process of recycling and reuse, there will be some impurities, resulting in the solubility of the reclaimed materials is not as good as that of raw materials, and there will be residues in the process of organic solvent dissolution. The commonly used plastic dissolved organic solvents are benzene, xylene, tetrahydrofuran, ether, acetone and formic acid. However, the dissolution method has great limitations, many plastic products will be added a variety of fillers in the process of processing, which affects the comparison between the return material and the original material. Therefore, there is a great error in the identification of material return by dissolution method, but it is a faster method to identify the type of plastic return material.

Operation of horizontal injection molding machine 1. Boot check Check the power cord before turning on the power supply, confirm that the hydraulic oil is sufficient and check whether the close switch of the safety door is out of order and whether the switch of the safety door is smooth. 2. Install the mould, it must be operated manually The die is matched to the fixed circle of the fixed plate to close the safety door, and the mold switch is switched to the mold setting adjustment to carry out the die. Adjust the mold so that the center of the nozzle as far as the nozzle up and down, left and right alignment, after the horse, the mold will be fixed on the fixed plate. Adjust the stroke and speed of the thimble, the stroke of the thimble may damage the mold when the stroke is overrun. So at first, you have to set it a little shorter. 3. Adjust the safety device of the die. Manual operation of molding operation Switch the operation selection switch to the Manual position, and then press the pump enable button. The safety door on the left should also be closed. The die switching switch switches to the "die mode", then the action of the die mode begins and the high voltage is completed. The ejector switches to "forward" and the nozzle contact is completed. When the ejector switch switches to "eject", the ejection action is carried out, and the pressure is converted from the ejection (primary) pressure to the secondary pressure. Note: turn on the screw drive motor 15 minutes after the temperature of the heating cylinder reaches the set temperature to avoid damage to the screw. 4. Measure the holding time of the pressure. Switch the screw switch to the "rotating" position and measure it. Switch the ejector switch and back the ejector to the appropriate position. After measuring the cooling time, switch the mold switch to "open mode". Press the ejection switch to measure the finished product. 5. Automatic operation of molding operation First from the manual operation, so that the molding conditions are stable, and then automatic operation into the molding operation. Before entering the automatic operation, set each timer and convert the operation selection switch to "semi-automatic" when it is to be formed by automatic operation. After confirming the security for four weeks, close the security door. When the die is closed, it will be converted from low pressure die to high pressure die on the way. When the closing pressure is confirmed, the ejector advances. After the nozzle contact is completed, the ejection begins, and when the ejection time timer is counted, the ejection and pressure holding are carried out. When the ejection time timer reaches the set time, it begins to cool and measure the injection material. The screw rotates and retreats. When the injection stops the contact of the proximity switch, the device is stretched out and retreated. When the cooling time timer arrives, the pressure in the closed mold cylinder drops and then the mode opening action is carried out. After the close switch contact is stopped, the opening mode action stops. Then the ejection action is carried out, at which time the finished product is ejected from the thimble and falls on the falling plate of the finished product. When the finished product is used to drop the plate, the fall of the finished product can be detected and enter the beginning of the next cycle. In the mechanical operation, if you want to stop urgently, immediately place the "emergency stop buckle" next to the side of the operating disk or anti-operating disk. 6. Stop the machine When the use of resin is easy to produce thermal decomposition, first stop the supply of materials and shoot out all the resin in the ejection cylinder, in order to avoid the resin left in the ejector cylinder and cause thermal decomposition. At this point, in the next mold operation, the resin hot cylinder temperature must be careful, because sometimes MELTON resin will be scattered. At the end of the operation and at the end of the operation, in order to ensure safety and protect the electrical devices, please remove the power supply and clean up the machine.

Maintenance and maintenance of screw cylinder It is found that the injection screw works in high temperature, high pressure, high mechanical torque and high friction environment for a long time. The first few factors are required by the process conditions, and the wear and tear caused by friction is inevitable. Generally, the screw is nitrided to improve the surface hardness, that is, to improve the wear resistance. However, if the cause of wear is ignored, if we do not try to reduce the wear as much as possible, the working life of the screw will be greatly reduced. Each kind of plastic has an ideal processing temperature range, and the processing temperature of the cylinder should be controlled so that it is close to this temperature range. When the granular plastic enters the cylinder from the hopper, it will first reach the feeding section, and dry friction will inevitably appear in the feeding section. When these plastics are not heated enough and the melting is uneven, it is easy to cause the inner wall of the cylinder and the surface wear of the screw to increase. Similarly, in the compression section and the homogenization section, if the melting state of the plastic is disordered and uneven, the wear will also increase. The speed should be adjusted properly. Because some plastics are reinforced, such as glass fiber, minerals, or other fillers. The friction of these substances on metal materials is often much greater than that of molten plastics. When injecting these plastics, if they are made with a high speed, the shear force of the plastics will be increased, and the strengthening will also result in more torn fibers, which contain sharp ends and greatly increase the wear force. When inorganic minerals glide at high speed on the metal surface, their scraping effect is not small. So the speed should not be set too high. 1. Do not start the machine when the cylinder does not reach the preset temperature. The new electric heating generally requires that the temperature reach the set value for 30 minutes before operating the screw. 2. If the shutdown is more than half an hour at a time, it is best to close the blanking port and clean the inner material of the material cylinder, and set up heat preservation 3. Avoid foreign bodies falling into the material cylinder to damage the screw and cylinder. Prevent metal fragments and sundries from falling into the hopper. If the recycled material is processed, a magnetic hopper should be added to prevent iron chips from entering the hopper. 4. When using anti-salivating, it is necessary to make sure that the plastic in the cylinder is completely melted so as not to damage the parts of the transmission system when the screw retreats. 5. Avoid screw idling, skidding and other phenomena. 6. when using new plastics, the leftovers of the cylinder should be cleaned. When using POM, PVC, PA+GF and other materials, reduce the degradation of raw materials as much as possible, and rinse clean with ABS and other nozzle materials in time after shutdown. 7. To avoid the mixing of POM and PVC into the cylinder at the same time, the reaction will occur at melting temperature, resulting in serious industrial accidents. 8. When the temperature of the molten plastic is normal but it is constantly found that the molten plastic appears black spots or discoloration, the screw rod reverse ring seat (over apron, meson) should be checked for damage.

First, what is cracked steam white? Cracking steam whitening: cracking is a common defect in plastic products, including filamentous crack, microcrack, top white, cracking and trauma caused by adhesive die and channel die of parts, which can be divided into demoulding cracking and applied cracking according to cracking time. The main reason is caused by stress and deformation (mainly residual stress, external stress and stress and deformation caused by external environment). 2. How can it be improved? 1. With regard to materials: Proper use of release agent, pay attention to often eliminate fog attached to the mold surface and other substances Fully dry the material before molding and processing Pay attention to the selection of coatings and diluents that will not crack. 2. Molding process: Avoid getting involved in the air because of poor feed in the plasticizing stage On the basis of increasing melt temperature and mold temperature to ensure melt flow, injection pressure should be reduced as much as possible. Reduce screw speed and injection speed, slow down the speed of melt passing through gate, and adopt multistage injection molding. Adjust the speed and pressure of die opening to avoid demoulding cracking caused by rapid tensile products Avoid cracking everywhere due to weld marks and degradation of plastics The internal stress is eliminated and the crack generation is reduced by annealing immediately after forming. If cracks have already occurred on the surface of the plastic parts, the annealing method can be considered to eliminate them. The annealing treatment makes the plastic part fully heated for about 1 hour at a temperature about 5 ℃ lower than the hot deformation temperature of the plastic part, and then cools it slowly. It is best to anneal the cracked plastic part immediately after forming, which is beneficial to eliminate the cracking. However, there is residual stress in the crack, and the solvent in the coating can easily make the crack develop into a crack.

1. Potion Tank Body: Generally used materials are PP, PVC, stainless steel. If you do not need to heat can use PVC tank, the temperature below 70 °C can use PP tank, if the temperature exceeds 70 °C, you need to use stainless steel tank, but the electroplating tank is not available stainless steel tank (metal tank 0. In continuous plating, there are denominator slots and sub-slots. The mother tank is used for electroplating solution, and the child tank is for plating. At present, the child and mother groove are separated, the same body, and share three ways. The design of the main tank structure is relatively simple, only considering the factors such as water flow, stirring, steady flow, positioning, and the distance between yin and yang. 2. Groove base frame: There are generally derivative shelves of plastic medicine trough, angle iron, stainless steel square tube, black iron paint and so on. In order to consider the strength and corrosion resistance, it is recommended to use stainless steel square pipes. 3. Water Inlet System: Generally, pure water and tap water are used. Water intakes are provided on each medicine trough to replenish the water level and clean the trough. In order to avoid water pipe leakage or human negligence, the electroplating tank is not equipped with a water inlet device. 4. Drainage System: General drainage needs to be classified and then set up a drainage system. The waste water of terminal continuous electroplating is classified as acid liquid, alkali liquid, nickel liquid, gold liquid, tin and lead liquid, etc. It is recommended to use more than one inch of pipe for each groove drain. The drainage effect is better. The general washing tank is equipped with a single drain valve, and each electroplating medicine tank is equipped with a double drain valve to avoid human negligence will drain the medicine. Each water tank is provided with overflow pipes to avoid full water flowing to the other tank. 5. Exhaust system: Electroplating equipment needs to have a seal (that is, an upper cover) to have an exhaust effect. A suction outlet is arranged in the medicine tank which mainly produces waste gas, and the suction volume can be adjusted. Due to the high water content in the gas, it is necessary to have a drainage device. The extracted gas must also be treated as waste gas. : 6. Electric heating system: Because the medicine tank needs to be heated, the heating system is very important. The general heating system consists of heater, temperature sensor, liquid level sensor, temperature setter, TIMER, alarm and so on. As safety issues are taken into account, an automatic power outage system must be installed without water. Titanium is the longest material to soak in the potion, but in the strong alkali medicine sink, stainless steel or Teflon and other materials are recommended. 7. Cooling system: There are general direct freezing method and indirect freezing method. The direct freezing method is to pump the potion into the freezer to cool, and this method has a good freezing effect. The indirect freezing rule is to drain the cooling water pipe in the potion tank but the water pipe indirectly freezes the potion. This method has poor freezing effect and is difficult to clear the trough. The heat dissipation mode of the freezer is water cooling method (with cooling water tower) and air cooling method (fan). If tin-lead potion can maintain 24-hour low temperature state, the potion will not cause turbid situation. 8. Electronic control system: In addition to the electronic control of the above heating and cooling system, there are pump, filter, shock machine, rectifier, transmission, oven, blower and so on, which are usually controlled by power control box. The rectifier and transmission are set as the connecting device. 9. Scrape equipment: In continuous electroplating equipment, scraping methods include rubber scraper, brush, air blowing, water absorption sponge and so on. Among them, the blowing method is the best, but the cost is the highest. At present, there are air compressor generation and blower generation. The terminal structure is poor (easy to deform) is not suitable for brush and scraper, silicone rubber scraper is suitable for flat terminal. 10. Drying system: After electroplating, the water droplets on the terminal surface must be removed, otherwise the drying effect will be very poor. Generally, dry ovens are HEATER or IR, and dried in a hot air cycle. The oven shall have a temperature control device. 11. Discharge system: The general discharge mode is horizontal and vertical. The discharge area is equipped with a paper rolling device, a connecting switch and a positioning guide wheel. If the production speed is fast, it should be equipped with buffer wiring. 12. Receiving system: The general way of receiving materials is horizontal and vertical. The receiving area shall be provided with a transmission device (some special transmission devices are not in the receiving system), a counting device, a connecting switch, a receiving device, a paper turntable, a positioning guide wheel, and a buffer connection if the production speed is fast. 13. Pump filter: General horizontal pump and vertical pump, its specification is distinguished by HP horsepower, the greater the horsepower, the greater its flow rate, the filter core commonly used specifications are 1 μ, 5 μ, 10 μ, the smaller the μ number, the smaller the filterable particles, the better the filtration effect. It is generally recommended to use 1 μ in gold trough, 1 μ in palladium nickel tank and 5 μ filter center in others, and check regularly every week. The longer the filtration time, the better the effect, such as 24 hours filtration is the best. 14. Rectifier: At present, there are controllable silicon rectifier, electrocrystal rectifier, variable frequency rectifier, pulse rectifier and so on. Because the DC wave degree will affect the current density range, the smaller the filter degree is, the wider the operable current density will be. Usually, the filtering degree must be less than 3%. Among them, the frequency conversion rectifier is the best, and the filtering degree is about 0.1%. 15. Locator: The methods commonly used in the medicine tank are fixed (used in full immersion) and adjusted (when plating or considering current distribution), while the materials used are acid-alkali and heat-resistant plastics, glass, ceramics, etc. As for locators outside the medicine trough, stainless steel is mostly used. 16. Yin and anode: The specification of cathode (anode) conductive wire is = = maximum operating current / 4 * (number of lines). If the current is 100 amperes and there are two conductors, the cross section of the conductor needs to be at least 12.5 square millimeters. The anode can be divided into soluble anode and insoluble anode. Dissolved anode is used in supplement (common metal electroplating is common), and insoluble anode is used as auxiliary anode, such as nickel metal as dissolved anode and titanium basket as nickel metal, so it is insoluble anode. Precious metal electroplating usually uses insoluble anodes and is conductive well. Precious metal insoluble anodes (such as platinum) are used. Cathode generally refers to plating parts, but the cathode conductive head for conductive cathode parts described here, the general cathode conductive head uses copper alloy or stainless steel material, must consider conductive, corrosion resistance, operation, cost, before the material can be determined. However, the contact between the cathode conductive head and the plating parts needs to be good, and the smaller the friction, the better. 17. Agitator: In order to promote electroplating efficiency, increase electroplating uniformity and increase current density, it is necessary to strengthen stirring effect. Generally, there are strong flow stirring, cathodic concussion stirring, ultrasonic stirring, air stirring and so on.

When the mold cavity is not filled, the injection pressure (read from the pressure gauge) is very low, because the resistance to melt flow in the nozzle, runner and mold cavity can be overcome. This continues until the cavity is filled with 100%. The pressure control of the injection molding machine is only the upper pressure control. If the pressure of an injection section is set to 90 bar, it only means that the pressure in this section cannot exceed 90 bar, but which pressure below 90 bar is determined by the melting resistance. This pressure can be read from the pressure gauge at the time of injection. Therefore, before the cavity is filled, the injection molding machine can not be controlled by pressure, but can only be controlled by speed. Pressure comes from resistance, but resistance is not controlled by injection molding machines. The stability of the injection product is closely related to the stability of the injection speed. Full closed-loop injection is aimed at achieving the specified injection rate for each injection. For the pressure setting of the injection section, please use the system pressure, which is the maximum pressure such as 140 bar or 160 bar. There is enough pressure to ensure that the injection can effectively control the speed. Because the mold cavity is not full, the high pressure setting will not be the reason for the hairy edge. Filling the mold cavity does not mean that the injection process is over, but also extrusion. In fact, the most different between injection and other molding methods is the extremely high injection pressure. This pressure is usually between 1000 and 2000 bar. You know, at the bottom of the deepest abyss on Earth, the water pressure is less than 2000 bar. Extrusion is produced by the compression of melting and the continuous injection of screw. It can also be seen as super full filling. A few percentage points of melting equivalent to the volume of mold cavity is squeezed in after the cavity is filled, so that the pressure rises sharply. The extrusion section is actually the last stage of injection, only the extrusion section needs to control the injection pressure, set a upper limit to prevent the emergence of hair edges. When the extrusion is over, turn to hold the pressure. The effect of holding pressure The function of holding pressure is to maintain a pressure when it melts cooling or curing shrinkage, continue to inject melting to fill the shrinkage space, and reduce or avoid the occurrence of indentation. The setting pressure of the pressure holding section should not exceed the set pressure of the extrusion section, otherwise the wool edge may be produced in the pressure holding section. The pressure holding pressure of multiple stages decreases in each stage, while the ideal decrease is linear gradual decline and non-class decline, so it is necessary to meet the actual needs of gradual contraction. Because of the slow shrinkage, the speed of the screw is also slow, 2% of the speed is enough. The energy saving of injection molding machine is mainly to reduce the flow rate of pump to about 3% when holding pressure, and the flow rate is always 100% quantitative pump ratio, which saves 97%. The longer the voltage holding time (the wall thickness is oversized), the more power consumption will be saved. From this, we can only control the pressure and can not control the flow rate, because the shrinkage is not controlled by the injection molding machine. This is the opposite of the previous part of the injection.

Insert molding (insert molding) refers to the molding method in which the resin is injected into the mold after the pre-prepared different material insert is loaded into the mold, and the molten material is joined and cured with the insert to form an integrated product. Out-sert molding refers to the injection molding process in which a part of a metal plate is embedded. The above two molding methods are essentially the same, and their characteristics are as follows. 1. The combination of easy formability, bending and metal rigidity, strength and heat resistance can be used to make complex and exquisite metal plastic integrated products. 2. In particular, the combination of insulation of resin and conductivity of metal can meet the basic function of electrical products. 3. The pre-molding combination of multiple inserts makes the post-engineering of product unit combination more reasonable. 4. Inlay products are not limited to metal, but also cloth, paper, wire, plastic, glass, wood, wire ring, electrical parts and so on. 5. For rigid molding products and flexible elastic products on rubber sealing gasket, the complex operation of arranging sealing ring can be saved after the integrated product is made by injection molding on the matrix, which makes the automatic combination of the later process easier. 6. because it is the joint between the molten material and the metal insert, compared with the pressing method, the gap between the metal insert can be designed narrower and the reliability of the composite product is higher. 7. Select the appropriate resin and molding conditions, that is, for products that are easy to be damaged (such as glass, coils, electrical parts, etc.), the resin can also be sealed and fixed. 8. select the appropriate mold structure, the inlay can also be completely sealed into the resin. 9. After the insert is formed, after the core hole is removed, the product with hollow groove can also be made. 10. With the combination of vertical injection molding machine, manipulator, insert assembly device and so on, most of the insert forming engineering can realize automatic production.

Transparent plastic as a result of high transmittance, the inevitable requirements for quality plastic products strict, can not have any markings, stomata, white. Fog halo, black spots, discoloration, poor gloss and other defects, so in the entire injection molding process on raw materials, equipment. Mold, and even product design, must pay great attention to and put forward strict or even special requirements. Secondly, because transparent plastics are mostly high melting point and poor fluidity, in order to ensure the surface quality of products, It is often necessary to make subtle adjustments in the process parameters such as high machine temperature, injection pressure, injection speed, etc., so that the injection plastic can be filled with mold, and will not produce internal stress and cause product deformation and cracking. Therefore, from the raw material preparation, the equipment and mold requirements, the injection molding process and the raw material treatment of the product must be strictly operated. 1. Preparation and drying of the material Due to the inclusion of any impurities in the plastic, it may affect the transparency of the product, so it is easy to store and transport. During the feeding process, attention must be paid to sealing to ensure that the raw materials are clean. In particular, the raw material contains water, which will cause the raw material to deteriorate after heating, so it must be dried, and when injection molding, the feeding must use a dry hopper. It should also be noted that during the drying process, the input air should preferably be filtered and dehumidified to ensure that the raw materials will not be contaminated. Its drying process such as, Drying process of transparent plastics: material processDrying temperature (°C) Drying time (h) Material layer thickness (mm) Remarks pmma70 ~ 802 ~ 430 ~ 40pc120 ~ 130 > 6 < 30 Adopt hot air circulation drying pet140 ~ 1803 ~ 4 Adopt continuous drying feeding device 2. The cleaning of cylinder, screw and its accessories to prevent raw material pollution and the existence of old materials or impurities in the sunken screw and accessories, especially the existence of resin with poor thermal stability, so that screw cleaning agent is used to clean each piece before and after use, so that it should not be stuck with impurities. When there is no screw cleaning agent, pe, ps and other resins can be used to clean the screw. When temporary shutdown, in order to prevent the raw materials from staying at high temperature for a long time and cause the drop, the dryer and cylinder temperature should be reduced, such as pc, pmma and other cylinder temperature should be reduced to below 160 ℃. (hopper temperature should be reduced to below 100 ℃ for pc) Third, the problems that should be paid attention to in die design (including product design) in order to prevent poor return flow, or uneven cooling caused by poor plastic molding, resulting in surface defects and deterioration, generally in die design, we should pay attention to the following points. A = the wall thickness should be as uniform as possible and the demoulding slope should be large enough. B = the transition component should be gradual. Smooth transition to prevent sharp corners. Sharp edge generation, especially pc products must not have a gap C = gate. The flow channel is as wide and thick as possible, and the gate position should be set according to the shrinkage condensation process, and if necessary, the cold material well should be added. D = the surface of the die should be smooth and low roughness (preferably less than 0.8) E = exhaust holes. The tank must be sufficient to drain the gas from the air and melt in time F = in addition to pet, the wall thickness should not be too thin, generally not less than lmm.