S Fully Automatic Preform Injection System

  1. Barrier design screw improved the plasticization effect.
  2. Screw with chrome and the L:D ratio reach 25:1.
  3. Equipped with low speed but high torsion hydraulic motor to meet the requirements for PET preform production.
  4. The differential injection cylinder decrease the injection resistance and improve the injection accuracy.
  5. Back pressure could adjust on the control panel.
Advanced servo hydraulic system design
  • The whole hydraulic system is driven by servo motor.
  • The advantage of servo control:
  • Low power consumption: When the machine is cooling or without any movement, the servo speed is less than 10 RPM which the energy consumption is almost 0. Whilenormal electrical motorspeedaround 1500RPM. The output point of servo hydraulic oil directly connected with the directional valve who control the movement to save energy. While normal machine has to though flow control valve.
  • Precision: Pressure sensor make the accuracy of servo hydraulic system reach 0.1bar.
  • Fast react: It only takes 0.12s for the pressure and speed to reach maximum output.
Control system TECHMATION control system
  • Special control system for injection molding machine with high stability and low system down time, suitable for various industrial environment.
  • Fully closed loop hybrid electric servo control benefit by independent PID control to ensure high accuracy.
  • Flexible I/O and good scalability.
  • Fully digitalized control with high informationizationand intelligence.
Temperature control system
  • Equipped with ceramic heating coil with power 4W/CM2 while normal heater power is around 3W/CM2. The system can meet demands for PET material drying.
  • The accuracy of temperature could reach 1 degree with PID control.
Preform Take Out Robot Design
  • The robot equipped with one station cooling plate.
  • Easy adjustment for the distance between robot plate and mold.
Plasticization & Injection
  • Barrier design screw improved the plasticization effect.
  • Screw with chrome and the L:D ratio reach 25:1.
  • Equipped with low speed but high torsionhydraulic motor to meet the requirements for PET preform production.
  • The differential injection cylinder decrease the injection resistance and improve the injection accuracy.
  • Back pressure could adjust on the control panel.
Clamping Unit
  • Special clamping parameter design for PET make the mold open & close stable and fast.
  • Strong mold plate makes the mold get pressure balanced.
  • Square design which matching the mold.
Ejection Unit
  • With more ejecting pin make better ejection.
  • Bigger ejecting forceand longer ejecting distance than normal machine to solve the problem for big gram and long preform ejecting.
  • Ejecting stop work with the light sensor which protect the mold.
Innovation on water and gas circuit
  • Stainless quick plug for cooling water.
High reliability of the whole machine
  • The clamping unit is welded by H type steel.
  • Injection unit using 10mm steel
  • Equipped several parts of PC board which let the operator see machine inside clearer.
Material and structure of mold base
  • Use S136 stainless steel plate specially for plastic product mold, perfect anti-rust and anti-corrosion performance, high sheet hardness HRC35-40, with the aging treatment and the elimination of stress, no deformation after long time use and surface grinder accuracy up to 0.01mm. The mold frame is a one-time clamping all the template processing, to ensure the concentricity of forming hole and guide column, with high overall mold frame precision.
Preform shapingparts
  • Made of S136 material (Sweden ASSAB), with aging treatment & heat treatment done originally.
Mold core, base
  • The structure of the core and the mounting base adopts the taper positioning type, which can be split and directly formed by the core and the screw mouth to form the cone contact positioning so that the length of the screw mouth is shortened and the screw mouth is cooled more evenly and quickly. The short screw mouth is favorable for increasing the preform transfer efficiency and reducing the risk of incomplete grafting,,preform transfer speed significantly improved.
Neck ring
  • The waterway of screw mouthis W-type, more fully cooled, preform bottle temperature decreased, reducing the shrinkage fluctuations by bottle neck overheating. The screw is processed by Swiss AgieCharmilles spark machine and both inner & outer circular grinder, the taper precision is up to 0.005mm.
Mold cavity
  • The cavity is split-type, using spiral circulating water way, and can achieve the cooling effect of the preform quickly, and the cavity bottom damage can be replaced independently, effectively reducing the maintenance cost and shortening the preform cooling time.
Aging and heat treatment of mold forming parts
  • The forming parts of Sweden ASSAB S136 domestic factory to aging, heat treatment hardness: HRC52 degrees,provides great wear resistance of mold, the service life is obviously enhanced, all sliding parts contact surface inlaid self-lubricating wear-resistant copper alloy.
Mold forming part structure
  • The structure of main parts are the same with foreign well-known brands, remove flexible and rapid, convenient for maintenance. Mold processing time increased 30%, but the removal and maintenance time reduced 50%. With double cone positioning principle and processing ability of high accuracy, so that can down the changeable factors to the bottom
Hot runner structure
  • The cylinder piston flew with the hot runner, wont accure the core difference of the valve needle and the mold cavity because of the expanding due to the hot runner heating up, and the cylinder and the hot runner plate is not a precision fit structure, can be arbitrarily disassembled, easy to maintain. The components are the same as the international famous brand molds, and the parts can be interchangeable.
Hot runner temperature control structure
  • The hot runner is equipped with an independent person responsible for the assembly, there are standard operating standards and testing procedures, with the multi point and multi - layer balanced filling structure, to ensure the consistency of each mold cavity injection schedule. Hot runner uses the embedded square heating tube heating, the heating pipe around the shape of the runner layout, with fantastic heat transfer, can ensure that the temperatures consistency of the injection point. While with the special nature of the design, make the heat expansion coefficient to the lowest point, make sure the accurate of each injection points location, AA value stability.
Precision of mold processing
  • Spare parts is processed in the stable temperature workshop, through the German DMG six-axle turning and milling composite machine and CNC grinding machines and some other high-precision equipment, dense processing equipment with heat pipe around the shape of flow channel layout, with better heat transfer. Adopt the three Coordinate detector for inspection to ensure the dimensional accuracy errorof parts processingreach only 0.01mm.
The weight deviation of the whole mold preforms
  • Since the improvement of the processingprecision and the reasonable design of the hot runner system, the weight deviation of the same mold down to 0.2 gram.
Production cycle time
  • Mold structure, optimization of waterway structure and balanced injection of hot runner, the production cycle efficiency can be increased more than 15%.
Life time
  • High-precision machining conditions and material properties, hardness and other enhancements to ensure the stronger wear ability of the mold, so the mold normal life of up to 300 million times which is applicable to high-speed and high-efficiency injection molding system.
Use cost of mold
  • Since the update of the hot runner technology and spare parts hardness, the annual normal maintenance costs over the warranty period is about 2%. Since the change of structural, exhaust function has been greatly improved, with the stabile hot runner system, reject rate only reach 0.3% or lower.
Item Unit S260 / 1500 S260 / 2000 S300 / 2000 S300 / 2500
Screw L/D Ration L/D 25 25 25 25
Screw Diameter mm 75 80 80 90
Injection pressure kgf/cm² 1280 1125 1400 1106
Injection volume cm³ 1414 1608 1810 2290
Shot weight (PET) g 1654 1882 2117 2680
Shot weight oz 58 66 75 95
Clamping force T 260 260 300 300
Clamping Stroke mm 540 540 585 585
Max/Min Thickness of mold mm 200 - 580 200 - 580 300 - 720 300 - 720
Space Between Tie Bars (W*H) mm 570 * 570 570 * 570 660 * 760 660 * 760
Ejector Stroke mm 150 150 180 180
Ejector Force T 8 8 20 20
NO.of Ejector Pins pcs 5 5 5 5
Max system pressure kg/cm² 160 160 160 160
Motor Power kw 36 36 44 44
Heater Input Capacity kw 32 36 36 44
Machine Size (L*W*H) cm 700 * 200 * 220 7000 * 160 * 220 800 * 200 * 220 800 * 210 * 220
Machine Weight T 12 12 14 14
Notice: Demark reserve the rights to make any product improvement or specification change without prior notice.

* Demark reserves the right to make changes to the products and specifications are subject to change without notice.

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