In-mold resin temperature measuring system

Advantages of introduction

• Optimization of molding conditions and improvement of reproducibility

  

  Conventional thermocouples have a response time of several seconds, making it difficult to accurately measure the peak temperature of resin flowing inside the mold. In contrast, our resin temperature sensor employs an optical fiber infrared method, providing a high-speed response that can track rapid changes in resin temperature within the mold. This enables appropriate temperature control for each resin and mold, leading to optimized molding conditions and improved reproducibility.

• Accurate resin temperature control

  

  In the case of contact-type sensors such as thermocouples, resin shrinkage can create a gap between the sensor tip and the resin, making accurate measurement difficult. In contrast, our resin temperature sensor can always perform accurate temperature measurement because it detects the infrared radiation emitted by the resin even if the sensor tip does not touch the resin. As a result, resin temperature can be accurately controlled during each molding process, from resin filling to holding pressure, cooling, and mold opening.

Features

The resin temperature inside the mold measured by the resin temperature sensor can be displayed in real time as a waveform using commercially available measuring equipment or data loggers. Our resin temperature sensor uses an optical fiber infrared system, achieving a high-speed response of 8 ms and allowing it to track the resin temperature that changes from moment to moment inside the mold. This is highly effective in optimizing various conditions such as pressure retention, cooling, nozzle temperature, mold temperature, molded product removal temperature, and even the molding cycle.
In addition, by connecting the resin temperature sensor to the injection molding monitoring system "MVS08", it is possible to simultaneously measure not only the resin temperature, but also the reThe resin temperature inside the mold, measured by the resin temperature sensor, can be displayed as a waveform in real time using commercially available measuring instruments or data loggers. Our resin temperature sensor adopts an optical fiber infrared method, achieving a high-speed response of 8 ms, making it capable of tracking rapid changes in resin temperature inside the mold. As a result, it is highly effective for optimizing various conditions such as holding pressure, cooling, nozzle temperature, mold temperature, product removal temperature, and even molding cycle time.
In addition, by connecting the resin temperature sensor to the injection molding monitoring system "MVS08," it is possible to simultaneously measure resin temperature, resin pressure, mold temperature, and mold opening.sin pressure, mold temperature, and mold opening.

• Resin temperature measurement waveform

  

Measurement principle

The resin temperature sensor is equipped with an internal optical fiber, which, when embedded in the mold, transmits the infrared radiation emitted by the resin flowing inside the cavity to the relay amplifier via the optical fiber. After the relay amplifier converts the infrared radiation into an electrical signal, the measuring amplifier performs further processing, and finally the signal is output as a temperature reading.

Types of measurement amplifiers and sensors

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  Resin temperature measurement amplifier
  EPT-001

  • A single product can conduct simultaneous measurement in four channels.
  • Capable of outputting 1 V per 100˚C, this product can be used in combination with a general-purpose measurement instrument or a control device.
  • 1 msec sampling speed applicable to high-speed filling
  • Due to our proprietary sensor sensitivity adjustment system, the need for burdensome calibration work has been eliminated.
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  Resin temperature sensor: ejector pin type EPSSZL series

  • Infrared ray detection method that uses optical fiber
  • High responsiveness: 8 ms (at time of 63.2％ response)
  • Resin temperature in the range of 60˚C to 430˚C can be measured.
  • The ejector pin shape allows easy incorporation in a mold. (*1)
  • With the minimum tip diameter of φ1.7 mm, the product is also applicable to small-size mold products.

  *1 Machining such as flange cutting to prevent rotation is not possible.

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  Resin temperature sensor: flush-mount type EPSSZT series

  • Infrared ray detection method that uses optical fiber
  • High responsiveness: 8 ms (at time of 63.2％ response)
  • Resin temperature can be measured in the range of 60˚C to 390˚C.
  • Its flush-mount shape has achieved a highly flexible sensor installation position.