Soleplate
A soleplate includes a metallic layer, a non-ferromagnetic layer and a ferromagnetic layer sandwiched between the metallic layer and non-ferromagnetic layer. The soleplate is used in an induction heating-based cordless iron. The electromagnetic field from an induction coil located in a stand, where the iron rests and gets charged, can pass beyond the non-ferromagnetic layer and heat the ferromagnetic layer efficiently. The non-ferromagnetic layer that is forming an ironing plate ensures a uniform heat transfer to the metallic layer for good steaming performance for effective cordless ironing.
1. A soleplate comprising a metallic layer, a non-ferromagnetic layer and a ferromagnetic layer sandwiched between said metallic layer and said non-ferromagnetic layer, wherein a metal-based thermal conductivity paste is situated between said metallic layer and said ferromagnetic layer.
2. The soleplate of claim 1 , wherein said metallic layer has a specific heat of at least 900 J/kg K and a thermal conductivity of at least 150 W/m K.
3. The soleplate of claim 1 , wherein said non-ferromagnetic layer has a thickness not more than one skin depth and said ferromagnetic layer has a thickness of at least three times the skin depth.
4. The soleplate of claim 1 , wherein said non-ferromagnetic layer has an electrical resistivity of at least 0.4 micro-Ohm meter and a relative magnetic permeability of at least 1.
5. The soleplate of claim 1 , wherein said ferromagnetic and said non-ferromagnetic layer are comprised in a sheet of clad metal.
6. The soleplate of claim 5 , wherein said clad metal is sandwiched between two layers of aluminum.
7. The soleplate of claim 6 , wherein one of said layers of aluminum, which is in contact with a garment during the active phase of ironing, is provided with a decorative coating.
8. The soleplate of claim 7 , wherein said decorative coating is a PTFE or sol gel.
9. The soleplate of claim 1 , wherein said metal-based paste is a metal-filled epoxy-based paste.
10. The soleplate of claim 1 , wherein an insulating paste is situated between said ferromagnetic layer and said non-ferromagnetic layer.
11. The soleplate of claim 10 , wherein said insulating paste is a silicone-based paste or an epoxy-based paste.
12. A cordless iron comprising the soleplate of claim 1 .
13. The cordless iron of claim 12 , wherein control means are provided for controlling steam generation.
14. A soleplate comprising:
a first metallic layer;
a non-ferromagnetic layer;
a ferromagnetic layer sandwiched between the first metallic layer and the non-ferromagnetic layer;
a second metallic layer located over the non-ferromagnetic layer; and
a sol gel layer located over the second metallic layer.
15. The soleplate of claim 14 , further comprising a third metallic layer sandwiched between the first metallic layer and the ferromagnetic layer.
16. The soleplate of claim 14 , wherein the second metallic layer and the third metallic layer comprises aluminum.
17. The soleplate of claim 16 , wherein the second metallic layer is thinner than the third metallic layer.