PRETREATMENT OF SUBSTRATE FOR POWDER PAINTING

PURPOSE:To prevent the generation of the defective appearance occuring in the oozing of oil from the inside of the seam in the stage of stoving after powder painting, by degreasing and washing the substrate having the seam by using a solvent prior to alkali degreasing. CONSTITUTION:A substrate havin...

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Bibliographische Detailangaben
Hauptverfasser:	OOTAKE SHIGEAKI, KAWAKAZU SHIGENOBU, HORIUCHI MASAO
Format:	Patent
Sprache:	eng
Schlagworte:	APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL PERFORMING OPERATIONS PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL SPRAYING OR ATOMISING IN GENERAL TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To prevent the generation of the defective appearance occuring in the oozing of oil from the inside of the seam in the stage of stoving after powder painting, by degreasing and washing the substrate having the seam by using a solvent prior to alkali degreasing. CONSTITUTION:A substrate having a seam such as housing or the like is beforehand degreased and washed by using a chlorine solvent such as trichloroethylene or the like and is thereby subjected to a pretreatment for washing away the oil on the surface and in the seam. The substrate is then passed through an alkali degreasing stage and is then subjected to powder painting and baking after a chemical conversion treatment. The defective appearance occuring in the uneven paint coated film in electrostatic painting of powder and the oozing of the oil in the stage of baking is prevented by the above-mentioned pretreatment method.