Are you facing problems like these?
Want to ensure molding quality
without relying on intuition or experience
- Unable to achieve smooth start-up when transferring mass production overseas
- Want to maintain the same workmanship and quality of each cavity molded item
Want to achieve quality control
without high costs
- Too much inspection and sorting work for short shot defects
- Want to meet customer requests for traceability on a shot-by-shot basis
How about identifying resin pressure waveforms in molds for controlling molding quality and achieving uniformity?
MinebeaMitsumi's integrated mold sensing system is capable of simple, low-cost measurements, management, and recording of "cavity pressure waveforms" and "cavity temperature waveforms" that are key parameters directly related to molded product quality.
Determination function and analog voltage output can also operate with stand-alone amplifiers.
PCs not required other than for initial setup when used for mass production.
Measurement principle
The force pushing out E-pin is measured with the cavity pressure force, and the
pressure value is converted and calculated from the set E-pin tip area. The only processing required for the mold is making grooves in the ejector plate.
Watch product video for more details
Cavity pressure sensor features
Short mold detection and cost savings
Uses high-precision and high-sensitivity cavity pressure sensors,
ensuring reliable detection of even minute shorts such as scoring.
- Cost reduction by changing full visual inspections to sampling inspections
- Cost reduction by changing microscopic inspections to simple visual inspections
Other examples of solutions are also available.
For more information, please contact us here.
4-gage type used as cavity pressure sensor
Strain gage developed and produced in-house.
Miniaturizing the strain gage allows a 4-gage type, despite being a compact sensor.
1/4 compared to 1-gauge type
Small amount of strain
- Minimizes impact on molded products.
(Convex shape of E-pin section) - Long operating life due to reduced mechanical fatigue.
(Cavity pressure sensor: 1 million times at rated load,
∞ times at 70% of rated load)
Effects are canceled out between four strain gauges
Less affected by temperature changes
- Less variation in measured values due to temperature changes in the mold.
Product Lineup
-
Integrated mold sensing system
![]()
MIS-202-PT/PP
High-end model allowing simultaneous measurement of mold cavity pressure and
cavity temperatureDigital conversion module with 8-channel input (max. 32 channels) for measuring cavity resin pressure of injection molding machines and mold temperature corresponding to resin behavior.
Pressure/temperature values are monitored under preset conditions, and results are output as alarm signals. Pressure/temperature waveforms converted to analog voltages can also be sent to molding machines.*Cavity temperature sensors can be connected to the relay box by changing the commercially available K-type thermocouple temperature sensor for measuring mold temperatures to a commercially available connector for K-type thermocouples.
-
Mold cavity pressure measurement system
![]()
MPC-201B-25
Standard model with 8-channel pressure
sensor inputMPC-203-25
Low-cost model with 4-channel pressure
sensor inputDigital conversion module with 4- or 8-channel input to measure the cavity resin pressure of injection molding machines.
Pressure values are monitored under preset conditions, and results are output as alarm signals.
Pressure value waveforms converted to analog voltages can also be sent to molding machines. -
Cavity pressure sensor
![]()
LSMSB-* series
(*20K/50K/100K/200K/500K/1T/3T)
Uses 4-gage type with in-house strain gages for a compact size, high accuracy and low cost. Installed at the base of ejector pins being used, allowing for flexible mold designs without being limited by the diameter of ejector pins.
-
Cavity temperature sensor
![]()
MMTK-01
Dedicated thermocouple-type sensor
Based on a thermocouple-type with the sensor is installed near the cavity or at a position where the tip is exposed to the cavity, to dynamically detect temperature changes corresponding to resin behavior.
The sensor has a small φ1 tip diameter and can even be installed on small measurement targets. -
Sensor cable storage type relay box
MRB-304-BI/MRB-304-CV
Storing the relay box and sensor cable within the mold reduces the risk of sensor cable breakages when molds are raised or lowered from molding machines.
Alternatively, the sensor cable can be stored in the relay box cover, reducing the risk of sensor cable breakages when it is raised or lowered from molding machines.
Steps for system usage
*Trials are also available.
For more information, please contact us here.
- Can pressure waveforms be transmitted to the molding machine side?
-
Analog voltages are output from the amplifier.
If molding machines have a function to input this value, the waveform can be transmitted to molding machines. - Is actual cavity pressure monitoring performed at multiple locations on the mold? Can the set target be controlled for each location?
- For multiple installations, sensors are to be installed at the same location of each cavity. The reference cavity waveform is set as the target, and an area to monitor is configured to perform balancing and pass/fail judgment for each cavity.
- Is there a rough estimate of how many load cells are needed for molded products, despite this likely depending on the size of the molded product?
- There is no single answer as this depends on the size of the product, but in many cases an ejector pin is mounted in areas prone to shorts. When used for determining conditions or other purposes, checking for correlation first is recommended by installing pins near the gate or near the opposite gate.
- Is coordination with molding machines possible after defects are detected with the cavity pressure sensor?
- An external alarm signal is output when a defect is detected, which can be linked with molding machines or unloaders.
- Are products other than cavity pressure sensors available that can be installed on injection molding machines?
- A compact type metal detector* is available to inspect molded products for the presence of metalic foreign object.