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Temperature controlling of higher accuracy
Evaporator has adopted a new shell & tube system, which uses two pumps, one for circulation and the other for the process and by the proportional controlling with the mixing valve, the control range has been expanded.

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Temperature controlling of higher accuracy

Evaporator has adopted a new shell & tube system, which uses two pumps, one for circulation and the other for the process and by the proportional controlling with the mixing valve, the control range has been expanded.

Application

Injection Molding for High Cycle
Blow Molding
Cooling Roll

Temperature Control

5 to 50 degC

A High Grade System Built By Reiken Temperature Technology

For temperature controlling of higher accuracy, the evaporator has adopted a new shell & tube system, which uses two pumps, one for circulation and the other for the process and by the proportional controlling with the mixing valve, the control range has been expanded to cover the 5 to 50 degC range. In addition, the heat calories are indicated on the operational panel and the testing functions are integrated for quality stabilization. DCN Controller has thus been developed with aims at truly ideal molding operation.

 

Calorimeter Display

As the operating conditions displayed, such as

  • 1. Set Temperature
  • 2. Actual Temperature
  • 3. Return Temperature
  • 4. Flow Rate
  • 5. Pressure Loss
  • 6. Loaded Calories

Repeat accuracy of molding conditions is improved and the molding machine is brought under the best control.

Normal Operation Started In One Touch.

An interactive operational panel is adopted for a greater convenience in operation. Setting is simple and easy. Only follow the instruction displayed on the panel. No error. Normally, the equipment is operated full automatically by the data stored in the memory. In case of any failure, the conditions are displayed on the panel for smooth and quick recovery of the trouble.

Control Range

By constructing the internal circulation circuit (controlled at a predetermined temperature) and heating medium circulating circuit (controlled by mixing valve) separately, the control range has been expanded up to 50 degC.

Proportional Control by Mixing Valve (Ampere output 4 to 20mA)

Temperature control of the heating medium used to be done before by turning on and off the freezer, so poor accuracy of temperature control. Besides, material fatigue by the vibration and sometimes breakage (of the freezer) and insufficient cooling caused by the heat generated in the motor at start (because of inadequate insulation of motor) were unavoidable. Adoption of proportional control by the mixing valve has solved all these problems and remarkably improved temperature accuracy.

Shell & Tube Evaporator

Conventional multiple-pipe systems have a limited quantity of circulation, however, the adoption of a shell & tube system having characteristics as described below for the heat conductivity required has increased the freezer performance to the highest level.

Characteristics of Shell & Tube System

  • 1. The heat exchanging area is 40 % greater than that of the multiple pipe system and as a result the heat conduction has been improved.
  • 2. Because of a small temperature difference of control, the low temperature zone can also be controlled.
  • 3. Because of little pressure loss, circulation of the heating medium with the temperature difference of 1.5 degC for the heat conductivity is possible.

Disadvantages of Multiple Pipe System

  • 1. With the flow speed in pipe at 2.0 m/s or faster, erosion of pipe may start to cause damages, and sometimes the pipes are unrepairable.
  • 2. Temperature difference of 4.0 degC for the heat conductivity is the maximum limit.