Gamma works in the field of heating elements using an advanced Research and Development Laboratory, which is responsible for:
- Designing the heating elements with the aid of a CAD-CAM system;
- Design and implement in detail insulations, metal parts and auxiliary equipment through a CAD-CAM;
- Perform tests on prototypes according to CEI, UNI EN, UL and CSA through the use of a computerized test bench;
- Carry out the thermographic detection of the air flow output and air flow rate on the prototypes of household appliances;
- Create products tailor made;
Resistive stretched wire
Traditional technology for the production of electrical resistances with bare wire exposed to the air, obsolete because of the low efficiency and difficult to miniaturization, in addition to the lack of flexibility, reliability and safety.
SPIRAL-shaped resistive wire
The first technology for the manufacture of bare wire resistors exposed to the air to enable miniaturization and the resulting increase in power.
The easy availability of machines for the production of spirals, it has facilitated the spread, shifting production (especially for the consumer market) in countries where labor is less expensive.
Many professional applications still make extensive use of this technology because of its flexibility, strength and solid experience.
The disadvantages of this technology: the difficulty of industrialization / automation, limits in miniaturization and weight reduction, low quality consistency linked to labor.
WAVE-shaped resistive wire
It is the most current technology for the manufacture of resistors bare wire exposed to the air. The methods to give the wavy shape to the wire are varied, and there is not a common practice to all producers.
A technology now well established (Traditional Wave) allows a very limited aspect ratio h / p = 0.6 to 0.8 with consequent difficulty of miniaturization.
comparison of waves with different ratios of the form
High Wave technology, exclusive property of Gamma, allows to widen the field of work getting very high aspect ratios (up to h / p max = 2.5) universally considered excellent and to date unequaled.
In addition to the above characteristic, a High Wave Technology resistor turns out to be, when compared to a similar (Spiral or Traditional Wave-shaped) resistor, easier and safer, as well as difficult to counterfeit.
The wave technology is well suited to the industrialization and automation; in this way, disengaging itself from the variables related to labor, can provide an excellent consistency in the quality of the product.
More and more business applications are converging on this technology, confirming that factors such as innovation, quality, quantity and diversity are fundamental to making the product unique.
Wire wound on insulating supports
For some applications, the resistive wire is wound on an insulating support which can be:
- Lamellae micanite – when heat is transferred by contact
- Support of glass or silicon – when the heat exchange by convection
The winding on the micanite lamina is then covered with layers of mica insulating material whose thickness ensures a proper electrical insulation while ensuring the proper heat exchange. Very important during this phase is the verification of the dielectric strength and the quality of the materials used, in order to ensure a perfect stability in time.