Electrical Safety Device of Toshiba Injection Molding Machines The safety device is designed to secure safety by shutting off the electrical circuit with the opening of the safety gate. (1) Safety gate on the operation side The safety gate on the operation side is equipped with gate close limit switches （LS1A， LS1A1）. Opening the safety gate stops every machine movement in all operation modes by limit switches. NOTE: When the safety gate is opened in [AUTO] or [SEMI-AUTO] of OPERATION mode, close the safety gate and press [START] button to restart operation. NOTE: Electromagnetic locking device (LS1A3) might be added depending on the safety standards of the country where the machines are installed. 【Machines for China】 The safety gate is locked by electromagnetic locking device all the time. To release the safety gate in all modes, keep pushing [LOCK RELEASE] button on the operation controller and open the safety gate. The safety gate is locked even if the machine power is off. 【Machines for North America, Europe】 The safety gate is locked by electromagnetic locking device during following processes. (1)Machine
Read more →Plastic PET Preform Injection Molding Troubleshooting PET preform injection molding troubleshooting is very important during the whole PET bottles making process. As the PET preforms`s quality affects a lot in the following step PET preform blowing process. It may cause failed to bottle blowing if there are pet preform defects like the moisture not match the requirement(PET heating temperature is not collect). And will will waste lots of raw material if the preforms getting yellow (over melted or burned ). Below table list is the PET preform injection molding troubleshooting guide for your further information: Above PET preform injection molding defects and remedies are base on our experience in the last 16 years. Please feel free to contact us or leave a comment below if you had meet any other problems we don`t listed. We will try our best the work out a solution once we saw your message. Feel Free to Contact Us if Any Questions
Read more →Plastic PA6 Injection Molding Process Settings Barrel temperature: Feeding area 60～90°C (70°C) Zone 1 230 to 240 ° C (240 ° C) Zone 2 230 to 240 ° C (240 ° C) Zone 3 240 ~ 250 ° C (250 ° C) Zone 4 240 ~ 250 ° C (250 ° C) Zone 5 240 ~ 250 ° C (250 ° C) Nozzle 230 ~ 240 ° C (250 ° C) The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1. Feed zone and zone 1 temperature directly affect feed efficiency, increasing these temperatures can make feed more even Melt temperature: 240 ~ 250 ° C Barrel constant temperature: 220 ° C Mold temperature: 60 ~ 100 ° C Injection pressure: 100 ~ 160MPa (1000 ~ 1600bar), if you are processing thin section long channel products (such as wire tie), you need to reach 180MPa (1800bar) Holding pressure: 50% of the injection pressure; due to the relatively fast
Read more →Plasticized polyvinyl chloride (P-PVC) Barrel temperature: feeding zone: 30～50°C (50°C) Zone 1: 140 ~ 160 ° C (150 ° C) Zone 2: 150 to 180 ° C (165 ° C) Zone 3: 160 ~ 220 ° C (180 ° C) Zone 4: 160 ~ 220 ° C (190 ° C) Zone 5: 160 ~ 220 ° C (190 ° C) Nozzle: 160～220°C (200°C) The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1. Melt temperature: 200 ~ 220 ° C Barrel constant temperature: 120 ° C Mold temperature: 30 ~ 50 ° C Injection pressure: 80 ~ 120MPa (800 ~ 1200bar) Holding pressure: 30% to 60% of injection pressure Back pressure: 5～10MPa (50～100bar) Injection speed: In order to obtain a good surface quality, the injection should not be too fast (multi-stage injection if necessary) Screw speed: set the medium screw speed, the maximum folding line speed is 0.5m / s Measuring stroke: 1.0 ~ 3.5D Residual amount: 2
Read more →Plastic PVC-U Injection Molding Process Settings PVC – unplasticized (PVC-U) Barrel Heating temperature: feeding zone: 30～50°C (50°C) Zone 1: 140 ~ 160 ° C (150 ° C) Zone 2: 165 ~ 180 ° C (170 ° C) Zone 3: 180 ~ 210 ° C (190 ° C) Zone 4: 180 ~ 210 ° C (200 ° C) Zone 5: 180～210°C (200°C) Nozzle: 180～210°C (200°C) The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1. Melt temperature: 210 ~ 220 ° C Barrel constant temperature: 120 ° C Mold temperature: 30 ~ 60 ° C Injection pressure: 80 ~ 160MPa (800 ~ 1600bar) Holding pressure: can not be set too high, 40 to 60% of injection pressure, based on modules and gates Back pressure: Due to its thermal sensitivity, it is critical to set the back pressure correctly; the heat generated by the screw friction (closed heat input control) is better than the heat generated from the barrel heating
Read more →Plastic PS Injection Molding Process Settings Polystyrene (PS) Heating Temperature: Barrel temperature feeding zone: 30～50°C (50°C) Zone 1: 160 ~ 250 ° C (200 ° C) Zone 2: 200 ~ 300 ° C (210 ° C) Zone 3: 220 ~ 300 ° C (230 ° C) Zone 4: 220～300°C (230°C) District 5: 220 ~ 300 ° C (230 ° C) Nozzle: 220 ~ 300 ° C (230 ° C) The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1. Melt temperature: 220 ~ 280 ° C Barrel constant temperature: 220 ° C Mold temperature: 15 ~ 50 ° C Injection pressure: has good flow performance, avoiding excessive injection pressure of 80 ~ 140MPa (800 ~ 1400bar) Holding pressure: 30% to 60% of injection pressure; relatively short holding time Back pressure: 5～10MPa (50～100bar); in the place where the back pressure is too low, bubbles are easily generated in the melt (there are gray and black lines in the product)
Read more →Plastic PP Injection Molding Process Settings Polypropylene (PP) Heating Temperature: Barrel temperature feeding zone 30～50°C (50°C) Zone 1 160 ~ 250 ° C (200 ° C) Zone 2 200～300°C (220°C) Zone 3 220 ~ 300 ° C (240 ° C) Zone 4 220 ~ 300 ° C (240 ° C) District 5 220 ~ 300 ° C (240 ° C) Nozzle 220 ~ 300 ° C (240 ° C) The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1. Melt temperature: 220 ~ 280 ° C Barrel constant temperature: 220 ° C Mold temperature: 20 ~ 70 ° C Injection pressure: has good flow performance, avoiding excessive injection pressure of 80 ~ 140MPa (800 ~ 1400bar); Except for some thin-walled packaging containers, it can reach 180MPa (1800bar) Holding pressure: avoiding the shrinkage of the product, it takes a long time to hold the product (about 30% of the cycle time); about 30% to 60% of the injection pressure
Read more →Plastic HDPE Injection Molding Process Settings Heating temperature: Barrel temperature feeding zone 30～50°C (50°C) Zone 1 160 ~ 250 ° C (200 ° C) Zone 2 200 ~ 300 ° C (210 ° C) Zone 3 220 ~ 300 ° C (230 ° C) Zone 4 220 ~ 300 ° C (240 ° C) District 5 220 ~ 300 ° C (240 ° C) Nozzle 220 ~ 300 ° C (240 ° C) The temperature in parentheses is recommended as the basic set value, the stroke utilization is 35% and 65%, and the ratio of module flow length to wall thickness is 50:1 to 100:1. Melt temperature: 220 ~ 280 ° C Barrel constant temperature: 220 ° C Mold temperature: 20 ~ 60 ° C Injection pressure: has good flow performance, avoiding excessive injection pressure of 80 ~ 140MPa (800 ~ 1400bar); Except for some thin-walled packaging containers, it can reach 180MPa (1800bar) Holding pressure: high shrinkage, it takes a long time to hold the product, dimensional accuracy is the key factor, about 30% to 60% of the injection pressure
Read more →The injection molding process refers to a process of producing a semi-finished part of a certain shape by pressing, injecting, cooling, and detaching the molten raw material. The injection molding process of plastic parts mainly includes six stages of clamping–filling—gas-assisted, water-assisted pressure-cooling-opening—release. 1. Filling stage Filling is the first step in the entire injection molding cycle, from the time the mold is closed to the injection, until the mold cavity is filled to approximately 95%. In theory, the shorter the filling time, the higher the molding efficiency; but in actual production, the molding time (or injection speed) is subject to many conditions. High speed filling. When the high-speed filling is performed, the shear rate is high, and the plastic has a viscosity drop due to shear thinning, so that the overall flow resistance is lowered; the local viscous heating effect also makes the thickness of the solidified layer thin. Therefore, in the flow control phase, the filling behavior often depends on the volume to be filled. That is, in the flow control stage, due to the high-speed filling, the shear
Read more →POM is an abbreviation for polyoxymethylene, and POM belonging to organic chemistry is a high density polymer. Therefore, POM is also known as cold steel, and POM is also called special steel. POM is a high-density, high-crystallization thermoplastic engineering plastic. POM has good physical, mechanical and chemical properties. POM also has a prominent feature, that is, POM has intentional friction resistance. What is the overall performance of POM? Below list the characteristics of POM plastic: 1, POM has a very low coefficient of friction and geometric stability, POM plastic is particularly suitable for the production of gears and bearings. 2, POM has high temperature resistance, so POM is also used in pipeline devices. 3, POM is a tough and elastic material, POM still has good creep resistance even at low temperatures, POM has good geometric stability and impact resistance. 4, the high degree of crystallization of POM leads to its high shrinkage, POM plastic can reach 2% to 3.5%. POM has different shrinkage rates for a variety of different reinforced materials. POM is a crystalline plastic. The melting point of
Read more →Plastic Injection Molding Process Parameters have 5 big parts: Injection Pressure,Injection Time,Injection temperature,Dwell Pressure and Dwell Time, Dwell Pressure and Dwell Time. They are all very important setting for injection molding engineers. 1. Injection Pressure Injection pressure is provided by the hydraulic system of the injection molding system. The pressure of the hydraulic cylinder is transmitted to the plastic melt through the screw of the injection molding machine. Under the pressure push, the plastic melt enters the vertical flow path of the mold through the nozzle of the injection molding machine (also the mainstream channel for some molds), the main flow channel, and the split flow. The process, through the gate into the mold cavity, is the injection molding process, or the filling process. The pressure is present to overcome the resistance during the melt flow, or conversely, the resistance present during the flow process needs to be offset by the pressure of the injection molding machine to ensure a smooth filling process. During the injection molding process, the pressure at the nozzle of the injection molding machine is highest
Read more →Abstract: Optimal design of plastic injection molding parameters are discussed concerning preheating temperature, stove temperature, mold temperature, pressure oil temperature, clamping force, mold filling speed, filling pressure, dwell time, dwell presure, screw speed, pressure reliefback pressure. Norial problems and quality faults in plastic injection are also analyzed in detail. Injection molding refers to an operation process in which a resin is heated and melted, uniformly mixed with other additives, and then injected into a mold to be cooled and solidified to obtain a product having a desired shape. In order to allow the molten material to sufficiently flow into the corners of the mold cavity to obtain a product having a full shape, no wrinkles on the surface, and no voids inside, it is necessary to apply a high pressure to the melt at the time of molding. For a certain plastic parts, when the appropriate plastic varieties, molding methods and equipment are selected, and the reasonable molding process and mold structure are designed, in the production, the selection and control of the process conditions is to ensure the smooth
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