Polyester Heater

Polyester Heater

Polyester allows heated elements to have superior heat transfer and exceptionally uniform heat output, which results in a faster warm-up cycle and longer life. Also known as Mylar heater, this can be used to cover large areas with even heat on flat or gently curved surfaces. Polyester can be used with an etched foil or with one of our popular printed polymers.

Etched foil polyester heaters can be designed and fabricated in many types of configurations to fit the size and shape required in your application.

One of our printed polymers is a constant wattage circuit based on low resistance printed silver as the current distributor. The heat is generated by a number of parallel-connected polymer resistors and is therefore very robust and insensitive to small damages. The resistance is virtually constant up 100°C. The constant wattage polymer heaters or mylar heaters are mostly used in low power applications at moderate to high voltage, and can be less costly than metal foil to get the same low power required. The resistance in the polymer can be adjusted in the range from 50 ohm/sq to 50 000 ohm/sq and is therefore suitable for many different applications.

The other printed polymer functions as a PTC circuit also based on low resistance printed silver as a current distributor. The heat is generated by a number of parallel connected polymer resistors with PTC characteristics (Positive Temperature Coefficient). In most cases the polymer resistor is covering the polyester heater completely and hence gives a very even temperature distribution. The PTC effect makes the heater self-limiting and hence hot and cold spots are avoided as the power is generated were you need it.

The printed polymer heaters are also more corrosion resistance than metal heaters.

Etched foil

Heater benefits
- Low wattage
- Distributed wattage
- Edge loss compensation
- Very small sizes of heaters can be precisely 
   manufactured
- Economical mass production
- Accurate reproduction of complex circuits

Typical applications of the mylar heater
- Bathroom mirror heater
- De-icing equipment
- Rear view mirror
- Hand grip heater
- Cabinet heater

Datasheet

Constant Wattage Printed Polymer

Heater benefits
- Possible to use on many different substrates
- Robust design insensitive to small damages
- Corrosion resistant
- Large span of resistivity

Typical applications
- Floor heating
- IR targets
- Waterbed heaters
- High Voltage, small area applications

Datasheet

PTC Printed Polymer

Heater benefits
- Self regulation
- Robust design insensitive to small damages
- Corrosion resistant
- Cost effective at low power and high voltage
 

Typical applications
- Rear view mirrors
- Floor heating
- Waterbed heaters 
- Low temperature applications, de-icing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 Printed Polymer heaters are based on low resistance printed silver as current distributor. The heat is generated by a number of parallel connected polymer resistors with PTC characteristics (Positive Temperature Coefficient). In most cases the polymer resistor is covering the heater completely and hence gives a very even temperature distribution. The PTC effect makes the heater self limiting and hence hot and cold spots are avoided as the power is generated were you need it. The polymer heater is also very corrosion resistance compared to metal heaters.

Heater benefits
- Self regulation
- Robust design intensitive to small damages
- Corrosion resistant
- Cost effective at low power and high voltage
 

Typical applications
- Rear view mirrors
- Floor heating
- Waterbed heaters
 
- Low temperature applications, Deicing

defogg2Fullchance designs heaters for every specific rear view mirror, either in Constant Wattage or PTC. We meet most of the car manufacturer specifications, through high and low power, depending on the allowed maximum temperature on the glass.

With over 20 years of experience in the automotive industry, Fullchance can bring you its know-how in design, heat distribution, respect of OEMs specifications, and can help you determine the best balance between power and defrosting.

Our technicians will develop a heater that corresponds to your requirements, through the most advanced Cad programs.

We are producing both PTC and CW heaters, with adhesives on glass side, backplate side or both sides, depending on your need. We are using different ranges of adhesives to match your backplate and glass technology.

All heaters are tested in our Laboratory, and we supply you with the Data needed for its approval.

We supply over 18 million heaters over the whole world, and our heaters equip most of the well-known cars manufactured today.
Technical info:


Temperature distribution trough Infra-Red camera

Some data related to current consumption in relation with defrosting and maximum glass temperature measured on the technologies we produce today.

 
 

PTC thermistor 
PTC (Positive Temperature Coefficient) is the acronym means that the temperature coefficient is, the great pan-corrected temperature coefficient of semiconductor materials or components. Usually we talk about the PTC is correct temperature coefficient thermistor, or PTC thermistor. PTC thermistor temperature is a typical sensitivity of the semiconductor resistor, over a certain temperature (Curie temperature), its resistance values with increasing temperature of a step higher.

 
PTC thermistor is a thermally sensitive semiconductor resistor. Its resistance value rises sharply with increasing temperature after a defined temperature (Curie temperature) has been exceeded. This feature makes them ideal for use in countless applications of modern electrical and electronic engineering, for example as resettable fuses against current overload or as shortcircuit protection in motors. You find special motor starter PTC thermistors in the compressors of refrigerators for instance. Thermal protection of motors and transformers is another example of the versatility of PTC thermistors. The applications extend to measurement and control engineering, to entertainment, household and automotive electronics, plus data systems and telecommunications of course. PTC thermistors are also suitable as self-regulating heating elements, in auxiliary heating, nozzle heating and carburetor preheating in automobiles, as well as in many domestic appliances such as door locks for washing machines, or glue guns and hair curlers.

Due to the PTC thermistor is the more energy saving and safe component.it is  widely used in many  household electrical apppliances,electric power facilities and electronic products. In general,appliacation using PTC thermistor can be categorized according to three unique characteristics; resistance-temperature (R-T), current-time (I/T) and current-voltage (I/V) characteristic.
 

Figure 1 shows the typical dependence of the zero-power resistance on temperature.




 

The properties of electrically loaded PTC thermistors (in self-heated mode) are better described by the I/V characteristic than by the R/T curve (see figure 2). It illustrates the relationship between voltage and current in a thermally steady state in still air at 25 °C, unless another temperature is specified.



PTC Thermistors
      Thermistors are temperature dependent resistors ant “PTC” stands for positive Temperature Coefficient of resistance. Ceramic PTC thermistor is a functional semiconductor that exhibits a highly positive temperature coefficient with the rise of tem perature hits Curie Point (Tc) initially: the resistance goes down as temperature rises.Then, its resistance increases rapidly past a refere-nce temperature (or Curie temperature) and this is what we call the “PTC domino affect”Using different temperature coefficients.we can make differernt PTC for varies heater sensitive ceramics for differern applications. Due to the PTC thermistor is the most energy saving and safe componert, it is widely uesd in many household electrical appliances , electric power facilities, and electronic produ-cts.In general, aplplicantions using PTC thermistor can be categorized according to three unique characteristics: resistance-temperat-ure(R/T), current-time(I/T)and current-voltage(I/T)characteristics.

Resistance-Temperature Characteristics



The use of A category characteristicsis suttable for thermal sensor, over-heat protectors,motot stator and high heat generation heaters. Qhereas, in the B category, those withcurie point below 120℃, the Steep slope gives a higher resistance, sensitivity in a onoff situation, making them ideal for switching purposee.g. Thermal sensors ,overcurrent protectors,delays and degaussors.


 
Current-Time Characteristics


Turrent for a much shortet periond of time time.The typical application ohe current Time characteristics shows the relationship between the Current and the time under the operaton in rated voltage , the higher the volgate,a higher peak cf curren t-Time characteristics PTC used in degaussor,motor stator and delays.

Volgate-Current Characteristics


 
Volgate-Current characteristiscs is usually named after V-A character-istics.The V-C diagram is taken at steady state current(when current meas-ured becomes steady after some time from switched on)in still air 25℃ am-bient condition. On a standard ambient/heat dissipationo environment the PTC’s steady surface temperature(Ts) is practically the same and the power(wattage)within a small variance even if different voltages are used.This gives self-heating PTCthe advantage of dual of multi-voltage usage in different countries of different voltage.