Heater for cigarette-like electronic cigarette with excellent heat transfer efficiency and manufacturing method thereof
A heater for a cigarette-like electronic cigarette and a method of manufacturing the heater are provided. The heater is provided with a heat transfer efficiency improved by strengthening a bonding force between a cigarette support portion and a heater portion by thermally pressing and bonding the cigarette support portion and the heater portion together using a heat-dissipating adhesive layer with a heat-dissipating filler added to a high-heat-resistant thermoplastic polyimide resin.
1 . A heater for an electronic cigarette, the heater comprising:
a cigarette support portion configured to support a cigarette;
a heater portion located on an outer side of the cigarette support portion to heat the cigarette bound to the cigarette support portion; and
a heat-dissipating adhesive layer coated on a surface of the cigarette support portion to bond the cigarette support portion and the heater portion together,
wherein
the heater portion is located on an outer side of the heat-dissipating adhesive layer in a radial direction of the cigarette support portion,
the cigarette support portion includes a polymer or ceramic material having a heat resistance of 350° C. or more,
the heat-dissipating adhesive layer is comprised of:
a thermoplastic polyimide resin; and
a heat-dissipating filler dispersed and arranged in the thermoplastic polyimide resin,
the heat-dissipating filler is added in an amount of 20-50 by weight based on 100 by weight of the thermoplastic polyimide resin,
an adhesive force between the heat-dissipating adhesive layer and the cigarette support portion is 1.0 kgf/cm to 1.61 kgf/cm, and
the heater has a thermal conductivity of 0.5-1.2 W/m·k.
2 . The heater of claim 1 , wherein the thermoplastic polyimide resin has glass transition temperature (Tg) of 240-300° C. and thermal decomposition temperature (Td) of 500-550° C.
3 . The heater of claim 1 , wherein the heat-dissipating filler is comprised of at least one of carbon-based fillers including carbon black, carbon nanotube, and/or graphene.
4 . The heater of claim 1 , wherein the heat-dissipating filler is comprised of at least one of oxide-based fillers including boron nitride, silicon oxide, zinc oxide, and/or aluminum oxide.
5 . The heater of claim 1 , wherein the heat-dissipating adhesive layer has a thickness of 0.5-10 μm.
6 . A method of manufacturing a heater for an electronic cigarette, the method comprising:
forming a heat-dissipating adhesive layer on an outer surface of a cigarette support portion, wherein the cigarette support portion includes a polymer or ceramic material having a heat resistance of 350° C. or more;
arranging a heater portion to surround outside of the cigarette support portion on which the heat-dissipating adhesive layer is formed, wherein the heater portion is arranged on an outer side of the heat-dissipating adhesive layer in a radial direction of the cigarette support portion; and
bonding the cigarette support portion and the heater portion together with the heat-dissipating adhesive layer by thermally pressing the cigarette support portion and the heater portion to obtain the heater,
wherein
the heat-dissipating adhesive layer is comprised of:
a thermoplastic polyimide resin; and
a heat-dissipating filler dispersed and arranged in the thermoplastic polyimide resin,
the heat-dissipating filler is added in an amount of 20-50 by weight based on 100 by weight of the thermoplastic polyimide resin, and
an adhesive force between the heat-dissipating adhesive layer and the cigarette support portion is 1.0 kgf/cm to 1.61 kgf/cm, and
the heater has a thermal conductivity of 0.5-1.2 W/m·k.
7 . The method of claim 6 , further comprising: prior to forming the heat-dissipating adhesive layer, modifying the outer surface of the cigarette support portion.
8 . The method of claim 6 , wherein the heat-dissipating adhesive layer is formed by coating a heat-dissipating adhesive composition on the outer surface of the cigarette support portion by one method of spin coating, nozzle coating, spray coating, dip coating, and/or bar coating, and then drying.
9 . The method of claim 6 , wherein, in the bonding, the thermally pressing is carried out under a condition of 260-350° C.
10 . The heater of claim 1 , wherein the cigarette support portion has a cylindrical structure with a pointed end portion.
11 . The heater of claim 10 , wherein the heat-dissipating adhesive layer covers an entire surface of the cigarette support portion except for the pointed end portion.
12 . The heater of claim 10 , wherein the heat-dissipating adhesive layer covers an entire surface of the cigarette support portion.