POLYMER THICK FILM DEVICE
A PTF (polymer thick film) device ( 10 ) comprises a substrate ( 22, 32 ), a functional PTF layer ( 24,34 ) applied on the substrate and a protective cover ( 25, 35 ) applied over the PTF layer, the protective cover being an adhesive tape comprising a carrier layer ( 27, 37 ) and a layer of adhesive ( 26, 36 ), the carrier layer being coated with the layer of adhesive ( 26, 36 ), the layer of adhesive ( 26,36 ) having a thickness comprised in the range from 10% to 100% of the print thickness of the PTF layer ( 24, 34 ). The PTF layer is a carbon ink layer, a silver ink layer, a graphite ink layer, a carbon-silver ink layer, a carbon-graphite ink layer, a graphite-silver ink layer, a carbon-graphite-silver ink layer or a PTC layer (Positive Temperature Coefficient). The PTF device can be used as an electric heater, e.g for car seats.
1 . PTF device, comprising:
a substrate;
a functional PTF layer applied on said substrate, said PTF layer having a print thickness;
a protective cover applied over said PTF layer, said protective cover being an adhesive tape comprising a carrier layer and a layer of adhesive, said carrier layer being coated with said layer of adhesive, said layer of adhesive having a thickness comprised in the range from 10% to 100% of the print thickness of said PTF layer.
2 . PTF device as claimed in claim 1 , wherein said layer of adhesive has a thickness comprised in the range from 10% to 30% of the print thickness of said PTF layer.
3 . PTF device as claimed in claim 1 , wherein said substrate comprises at least one of PUR, PET, PEN, PEI, PE, ABS, PES, PS, PEEK, PI, PP, non-woven textile, woven textile and knitted textile.
4 . PTF device as claimed in claim 1 , wherein said layer of adhesive comprises at least one of acrylic, modified acrylic, hotmelt, rubber-based adhesive and silicone.
5 . PTF device as claimed in claim 1 , wherein said carrier layer has a thickness of 12 μm at most.
6 . PTF device as claimed in claim 5 , wherein said layer of adhesive has a thickness comprised in the range from 3 to 12 μm.
7 . PTF device as claimed in claim 1 , wherein said carrier layer has a thickness of 10 μm at most.
8 . PTF device as claimed in claim 1 , wherein said adhesive tape is a double-sided adhesive tape having a first side of said carrier layer coated with said layer of adhesive and a second side of said carrier layer coated with a further layer of adhesive, said carrier layer having a thickness of 10 μm at most.
9 . PTF device as claimed in claim 7 , wherein said layer of adhesive has a thickness comprised in the range from 3 to 10 μm.
10 . PTF device as claimed in claim 8 , wherein said further layer of adhesive comprises at most 300 g/m 2 of adhesive.
11 . PTF device as claimed in claim 8 , wherein said further layer of adhesive comprises at least one of acrylic, modified acrylic, hotmelt, rubber-based adhesive and silicone.
12 . PTF device as claimed in claim 8 , wherein said carrier layer comprises at least one of PET, PEN, PEI, PE, ABS, PES, PS, PEEK, PI, PP, non-woven textile, woven textile and knitted textile.
13 . PTF device as claimed in claim 1 , wherein said PTF layer is a carbon ink layer, a silver ink layer, a graphite ink layer, a carbon-silver ink layer, a carbon-graphite ink layer, a graphite-silver ink layer or a carbon-graphite-silver ink layer.
14 . PTF device as claimed in claim 1 , wherein said PTF layer is a PTC layer.
15 . Electric heater comprising a heating element arranged as a PTF device as claimed in claim 14 .
16 . PTF device, comprising:
a substrate;
a functional PTF layer applied on said substrate, said PTF layer having a print thickness;
a protective cover applied over said PTF layer, said protective cover being an adhesive tape comprising a carrier layer and a layer of adhesive, said carrier layer being coated with said layer of adhesive, said layer of adhesive having a thickness comprised in the range from 3 to 12 μm.
17 . PTF device as claimed in claim 16 , wherein said layer of adhesive has a thickness comprised in the range from 10% to 100% of the print thickness of said PTF layer.
18 . PTF device as claimed in claim 16 , wherein said layer of adhesive has a thickness comprised in the range from 10% to 30% of the print thickness of said PTF layer.
19 . PTF device as claimed in claim 16 , wherein said substrate comprises at least one of PUR, PET, PEN, PEI, PE, ABS, PES, PS, PEEK, PI, PP, non-woven textile, woven textile and knitted textile.
20 . PTF device as claimed in claim 16 , wherein said layer of adhesive comprises at least one of acrylic, modified acrylic, hotmelt, rubber-based adhesive and silicone.
21 . PTF device as claimed in claim 16 , wherein said carrier layer has a thickness of 12 μm at most.
22 . PTF device as claimed in claim 16 , wherein said carrier layer has a thickness of 10 μm at most.
23 . PTF device as claimed in claim 16 , wherein said adhesive tape is a double-sided adhesive tape having a first side of said carrier layer coated with said layer of adhesive and a second side of said carrier layer coated with a further layer of adhesive, said carrier layer having a thickness of 10 μm at most.
24 . PTF device as claimed in claim 23 , wherein said layer of adhesive has a thickness comprised in the range from 3 to 10 μm.
25 . PTF device as claimed in claim 23 , wherein said further layer of adhesive comprises at most 300 g/m 2 of adhesive.
26 . PTF device as claimed in claim 23 , wherein said further layer of adhesive comprises at least one of acrylic, modified acrylic, hotmelt, rubber-based adhesive and silicone.
27 . PTF device as claimed in claim 23 , wherein said carrier layer comprises at least one of PET, PEN, PEI, PE, ABS, PES, PS, PEEK, PI, PP, non-woven textile, woven textile and knitted textile.
28 . PTF device as claimed in claim 16 , wherein said PTF layer is a carbon ink layer, a silver ink layer, a graphite ink layer, a carbon-silver ink layer, a carbon-graphite ink layer, a graphite-silver ink layer or a carbon-graphite-silver ink layer.
29 . PTF device as claimed in claim 16 , wherein said PTF layer is a PTC layer.
30 . Electric heater comprising a heating element arranged as a PTF device as claimed in claim 29 .