Induction heating allows for both surface and core treatment of metals using a wide range of induction heating equipment possibilities. The best known use for induction heating equipment is for the Heat Treatment of metals.

There are few heat treating techniques that allow for a wide range of processes such as selected or continuous surface hardening, through hardening, tempering, annealing, normalizing and structure refinement.

The selectivity and speed of induction heating equipment combined with effective power transfer allows for more conservative use of energy in the heat treating process. In addition to the considerable advantage of reduced energy and associated costs in using induction heating equipment the following is realized:

■ Induction heating allows for the use of relatively inexpensive steels.
■ The small degree of part distortion after heat treating.
■ High production rate capability in cell or inline configuration.
■ Induction heating equipment is easily integrated into existing production
manufacturing line.
■ High repeatability for assurance of quality control.
■ Minimal to no surface oxidation.
■ Lower work in process requirements when
compared to furnace heat treating.
■ Use on Accelerated Austenitizing™ process.

INDUCTION HEATING EQUIPMENT FOR SURFACE TREATMENT

 

Surface Treatment refers to various metals heating operations such as the following: 

■  Degreasing pickling & drying
■  Galvanizing & tinning
■  Curing of paints, varnishes & pacification     
■  Annealing
■  Plating
■  Applications in this area are               
    numerous:

    - setting off tie cans.
    - polymerization of aerosol 
      tube inner varnish .

    - curing of seals.
    - polymerization of varnish  
      on copper wires and flats.
    - rilsan coating of steel   
       wires,  fabric or sheets. 

When induction heating technology is used, heat is transferred to the outer coating from the inside out, which is ideal for drying and curing operations since it allows solvents and vapors to escape.  This induction heating method therefore provides:

■  Better adherence.
■  Better surface appearance.
■  Good reproducibility, which is important when 
    drying colored paints.
■  Highly flexible operation via the selection of 
    treatment  temperatures.
■  A more compact treatment system that 
    may be operated discontinuously, without presence
    of thermic inertia.
■  Better adherence to the substance applied to the  
    metal.
■  Higher quality surface appearance.
■  Excellent reproducibility which is important when 
    drying colored materials.
■  Highly flexible operation by means of easy selection 
     of processing temperatures.
■  Compact and instant heat on/off capability controls 
     thermal pollution in the working environment.

INDUCTION HEATING FOR HEAT SEALING

Today, induction heating provides an elegant means of sealing aluminum covers on jars of food products.  The Induction Heat Sealing packaging method assures tamper protection, safety, hygiene and product preservation.  Induction heating of the aluminum film increases the temperature of the sealing product applied to the side of the cover in contact with the jar.  This heating is combined with pressure applied to the cover for 0.5 to 1.5s.  This process is applied to all shapes of containers and for a wide range of materials, including:  glass, cardboard, and plastics (PE, PP, PVC…).

In all cases there is no contact between the inductor and the cover.  In addition to this advantage, there are several reasons why this new method is increasingly used: 

■  The heat is generated in the cover itself as
    near to sealing surface as possible.  The
    process is thus simplified and the problems
    associated with the overheating of resistor
    type sealing heads are avoided.
■  The induction heat sealing method can be used for circular, oval,
     square, rectangular or other shapes
■  The medium frequency generator is made
    using solid state components and has no
    parts subject to wear during the heat sealing process.

We supply several types of Induction Heat Sealing systems:

■  One-step induction heat sealing.
■  Continuous induction heat sealing before encapsulation.
■  Static induction heat sealing before encapsulation.