Apparatus for curing photo-curable composition
AssigneesJapan Storage Battery Co., Ltd., Nippon Paint Co., Ltd.
InventorsHiroaki Mibu, Tadashi Ishihara, Chiaki Tanaka, Shingo Esaki
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Abstract
A photo-curable composition with high covering power provides the coating film with a glossy smooth surface when such composition is exposed firstly to light radiation having wavelengths of from about 350 nm to about 460 nm, and then to light radiation having wavelengths of from about 230 nm to about 400 nm with a specific ratio of the intensity of the former light radiation to the intensity of the latter light radiation.
Claims13
An apparatus for curing a photo-curable composition comprising a tunnel type irradiation chamber, a group of light source provided in the forward stage of the chamber for irradiating said composition at an irradiation intensity by the rays out of which wavelengths shorter than 300 nm are substantially eliminated and which have an abundance of radiation energy in a range of from about 300 to about 460 nm, and a group of light source provided in the afterward stage of the chamber thereby to irradiate the composition by rays having an abundance of radiation energy in wavelengths range of from about 230 to about 460 nm, and wherein a ratio of a maximum irradiation intensity E.sub.c for the wavelengths less than 300 nm from both groups of the light source to a maximum irradiation intensity E.sub.a from the first group of the light source on the surface of the substrate coated with said composition at the A light source region, that is E.sub.c /E.sub.a, is selected to a value not more than 0.1.
Apparatus for curing a photo-curable composition comprising a tunnel type irradiation chamber, transport means for moving said photo-curable composition through said chamber, a first group of light sources provided in the forward stage of said chamber for first irradiating said composition as it moves through the chamber on said transport means with radiation energy predominantly across the range of from about 300 to about 460 nm, and having substantially no wavelengths shorter than 300 nm, and a second group of light sources in the afterward stage of the chamber for subsequently irradiating said composition as it moves through the chamber on said transport means with radiation energy predominantly across the range of from about 230 to 460 nm, wherein the ratio of the maximum irradiation intensity E.sub.c for wavelengths less than 300 nm from both groups of light sources to the maximum irradiation intensity E.sub.A from the first group of light sources on the surface of said composition in said forward stage of the chamber is not more than 0.1.
Dependencies are inferred from the claim text.