Heat-dissipating film, and its production method and apparatus
OwnerSeiji Kagawainventor
Life of this patent
Estimating the term…
Abstract
A heat-dissipating film comprising a heat-conductive layer obtained by burning a mixture layer of flaky carbon and a binder resin to carbonize or burn off the binder resin, and plastic films covering the heat-conductive layer, the heat-conductive layer having a density of 1.9 g/cm3 or more and thermal conductivity of 450 W/mK or more, is produced by (1) sandwiching a mixture layer of flaky carbon and a binder resin with a pair of first plastic films to form a laminated film; (2) heat-pressing the laminated film to densify the mixture layer; (3) burning the mixture layer to carbonize the binder resin in the mixture layer; (4) pressing the resultant burnt layer to form the heat-conductive layer; and (5) sealing the heat-conductive layer with second plastic films.
Claims15
A method for producing a heat-dissipating film comprising the steps of (1) sandwiching a mixture layer of flaky carbon and a binder resin with a pair of first plastic films to form a laminated film;
- (2) heat-pressing said laminated film to densify said mixture layer;
- (3) burning said mixture layer exposed by peeling said first plastic films to carbonize or burn off said binder resin in said mixture layer;
- (4) pressing the resultant burnt layer to form a densified heat-conductive layer;
- and (5) sealing said heat-conductive layer with second plastic films.
An apparatus for producing a heat-dissipating film comprising (a) guide rolls for conveying a pair of first plastic films;
- (b) at least one dispersion-applying nozzle disposed for each first plastic film, such that a dispersion comprising flaky carbon and a binder resin is applied to said first plastic film plural times;
- (c) a chamber having a hot air inlet for drying each applied dispersion;
- (d), rolls for laminating a pair of said first plastic films each having the resultant mixture layer comprising said flaky carbon and said binder resin, with the said mixture layer inside;
- (e) heating rolls for heat-pressing the resultant laminated film;
- (f) rolls for peeling said first plastic films from said laminated film;
- (g) a die for burning said mixture layer, such that the exposed binder resin in said mixture layer is carbonized;
- (h) a pressing die for densifying the resultant burnt layer to form a heat-conductive layer;
- and (i) rolls for sealing said heat-conductive layer with second plastic films.
Dependencies are inferred from the claim text.