NOVELTY - The method comprises: dissolving a curable liquid crystal compound in a solvent in a starting solution storage tank; supplying the resultant starting solution to a coater via a liquid supply pipe from the starting solution storage tank using a pump; mixing a solution containing a chiral agent having a Helical Twisting Power (HTP) of 35-95 mu m-1 expressed by an expression into the supplied starting solution in the liquid supply pipe by an in-line mixing method; and coating a resin film (12) such as a polyethylene terephthalate film with a resultant curable liquid crystal composition.    USE - The method is useful for producing a light-reflecting film such as a window-attaching light-reflecting film, which is useful for shielding glass windows of houses or vehicles such as cars from heat and as a freezer showcase, an agricultural house material, an agricultural reflecting sheet, a solar cell film and a solar ray shielding member such as a heat-shielding glass or a heat-shielding film.    ADVANTAGE - The method is capable of economically producing the light-reflecting film with high transmittance in a visible light region and heat-shielding performance, excellent reflection performance and orientation property and increased productivity and strength thus effectively and safely preventing the transmission of some solar rays in the visible light region or the infrared light region in a solar light spectrum to cause a radio interference when using mobile phones.    DETAILED DESCRIPTION - The method comprises: dissolving a curable liquid crystal compound in a solvent in a starting solution storage tank; supplying the resultant starting solution to a coater via a liquid supply pipe from the starting solution storage tank using a pump; mixing a solution containing a chiral agent having a Helical Twisting Power (HTP) of 35-95 mu m-1 expressed by an expression into the supplied starting solution in the liquid supply pipe by an in-line mixing method; coating a resin film (12) such as a polyethylene terephthalate film with a resultant curable liquid crystal composition; drying the coated curable liquid crystal composition to form a cholesteric liquid crystal phase; fixing the cholesteric liquid crystal phase by proceeding a curing reaction of the curable liquid crystal composition to form a light-reflecting layer (14b); measuring a central reflection wavelength (950-2000 nm); controlling an amount of the chiral agent ( less than or equal to 5.1% by mass) added by a feedback from the measured central reflection wavelength; laminating another light-reflecting layer on the light-reflecting layer by changing the concentration or kind of the chiral agent; and producing a light-reflecting film (14a, 16a, 16b, 21) for attaching to a window. The expression is described as HTP = refractive index of curable liquid crystal compound / (selective reflection wavelength ( mu m) of cholesteric liquid crystal phase x ratio of chiral agent to curable liquid crystal compound). The mixing process of the chiral agent is carried out by using a static mixer disposed in the liquid supply pipe. One kind of cholesteric liquid crystal compound is used as the curable liquid crystal compound. The curable liquid crystal composition contains a photopolymerization initiator and an orientation-control agent. The light-reflecting layer reflecting right-handed circularly polarized light and left-handed circularly polarized light are formed. The light-reflecting film includes the light-reflecting layer on the resin film, and reflects greater than or equal to 30% of incident light of a wavelength of 800 to 2000 nm. An INDEPENDENT CLAIM is included for a light-reflecting film.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic cross-sectional view a light-reflecting film.    Resin film (12)    Light-reflecting films (14a, 16a, 16b, 21)    Light-reflecting layer. (14b)