Thin-walled injection molding machines and molds for injection requirements

For the production of small and light parts of the demand has become so thin-walled injection molding machine most in need of additional performance. "Thin" wall thickness is usually less than 1mm from the portable electronic parts defined. For large automotive parts, the "thin" can be 2mm. In short, the thin-walled products, processing technology to change: a higher pressure and speed, a shorter cooling time, to change the arrangement of parts ejection and the gate. The following is a thin-walled injection molding machines and molds for injection requirements. PRM Industry Abstract...Articles section Injection machine
Standard injection machine for the production of a variety of thin-walled products. The current performance of the new injection machine much more than 10 years ago. Materials, technology and design advances in the gate, further broadening the standard injection molding machine for thin-walled parts filling performance. However, due to decreasing thickness, the need for a more special, high-speed and high performance injection machines. For example, a thickness less than 1mm of electronic parts, filling time is less than 0.5 seconds and more than 210MPa injection pressure is normal. For thin wall injection molding machine hydraulic accumulator design, harmony can frequently drive injection mold. High-speed and high performance all-electric injection machines and electric / hydraulic injection machines have been published. To be able to withstand the new high-pressure injection machine, clamping force must be a minimum of 5 to 7 tons / inch (projected area). In addition, when the wall thickness to reduce the injection pressure increases, the large templates help reduce bending. Thin-walled products, injection machine used the rod on the template thickness ratio of 2:1 or less. Production of thin-walled products, the injection speed and pressure and other processing parameters of the loop control helps to control high voltage and high-speed filling and packing.
  The injection volume, large-diameter barrel is often too large, the recommended injection volume of cylinder capacity of 40% to 70%, thin-walled products, greatly reducing the total cycle time, injection volume may be reduced to the minimum capacity of 20 barrel % to 30%. Users in the injection must be very careful because of the material, the small injection volume means that the material in the machine barrel of a longer residence time, which will lead to performance degradation products, China Plastic Mould Network
     Mold
  Speed ​​is the key to the success of thin-walled injection molding factor. Rapid filling and high pressure can speed the melting of the thermoplastic material into the mold cavity, thereby preventing cold-gate. If a standard parts in the two seconds to complete filling, the mold thickness reduced by 25%, and filling time may be reduced by 50%, just 1 second. China Plastic Mould Network
     One of the advantages of thin-walled injection molding when the thickness decreases, less material need to be cooled. With the reduction in thickness, the molding cycle can be shortened by half. A reasonable set of melt conveying device so that the hot runner and the runner does not prevent the shortening of molding cycle. Use of hot runner and sprue bushing helps to shorten the molding cycle to a minimum. In addition, consideration should be given to the mold timber. P20 steel is widely used in the mold of traditional products, but due to the pressure of higher thin-walled injection molding, mold manufacturing to be very strong. H-13 and other hard steel as thin-walled mold with the additional safety factor. However, the firm's costs may be higher than the standard mold die 30% to 40%. However, the increased costs will normally be offset by improved production performance.

PRM Industry
Peter  Huang