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GELNORM® – DE Curing process measurement

GELNORM® – DE Curing process measurement
GELNORM® – DE Curing process measurement
Product Code : GELNORM-DE
Brand Name : GEL INSTRUMENTE
Product Description

 

GELNORM® – DE

Curing process measurement

 
Gelnorm®- DE is a novel measuring instrument for establishing the curing reaction of two-component reaction resin systems (thermoset resins). The new instrument is based on the deter-mination of a function of electical con-ductivity as well as the capacitance of a resin sample. This electrical function enables to trace the curing process over the whole regime of the chemical reaction.
 
 
 Hence, the instrument provides new possibilities to investigate the curing reaction of reaction resins such as:
·                     Epoxy resins
·                     Polyurethane resins
·                     Polyester resins
·                     Silicone rubbers
·                     Polysulphide rubbers 

 The electrical measuring technique offers numerous advantages compared to the various mechanical methods. In contrast to the conventional rheological approach (based e.g. on rotationor shear viscosi-meters), the polymer sample is in no way and at no time subject to any kind of mechanical forces. Thus, any kind of mechanical distortion of the polymer structure during the curing can be excluded.
 
The special design of the sensors (absolutely flat and thin, 17 x 55 x 0.04 mm) enables measurements to be made at almost any place. For example, it is possible to measure the hardening sequence of thin layers, large volumes of resin and also directly in a prepreg laminate.
 
Experiments with GELNORM - DE can generally be made under standard conditions both at room temperature and also at elevated temperatures up to 200 °C.
 
The instrument is very sensitive and the results show a high level of reproducibility. It offers reliability in operation and is easy to use and maintain. Hence, GELNORM - DE is not only suitable for research and development, but also in many areas of quality control.
 
DESCRIPTION OF INSTRUMENT
GELNORM - DE (Ref. 160.01) consists of a control unit which is based on a process controlled mea-suring system and a specially designed sensor DE.

By means of this sensor, an electrical conductivity function (with also a capacitive contribution) of the resin can be determined. As discussed abobe, the conductivity measurement correlates with the vis-cosity of the resin mixture.

A liquid crystal display is used to display all functions and parameters. All selections and inputs can be made by a menu-driven program.

All results remain stored. The Data can read out with a special program (Ref. 110.50). The data analy-sis can be done with MS-Excel.

Five different limiting values for the conductivity function can be preselected and thus individual processing times can be determined simply and without plotting the whole curing experiment.
 
THERMOSTATIC CONTROL
A prerequisit for a high reproducibility of the experiments with GELNORM - DE is an optimum ther-mostatic control of the sample. The measurements can either be carried out at room temperature or using the Electric Heating Block DE (Ref. 160.60) designed for GELNORM - DE to provide the desired thermostatic control for temperatures up to 200°C. The temperature is regulated with the Control Unit TC-3 (Ref. 70.05).
 

TECHNISCHE DATEN

Gelnorm® – DE                                                               Ref. 160.01

Temperature range                                                        From room temperature up to. 200 °C (heating block DE)

Operating voltage                                                           230 V / 50 Hz or 115 V / 60 Hz ± 10 %

Interface                                                                             RS-232, 9600 Baud D-Sub Stecker

Measuring sensor                                                            Special-Sensor DE Ref. 160.25 short (L = 55 mm)

Ref. 160.30 long (L = 330 mm)

Measuring principle                                                       Process controlled measurement signal

Program memory                                                          Eprom

Data summary                                                                 Battery -RAM

Time/Date                                                     Actual time module

 


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