KR950003018A - Learning blackboard with enamel coating layer and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a learning blackboard and a manufacturing method by coating an enamel on the upper portion of the metal sheet, the conventional learning blackboard is a writing instrument is absorbed in the writing surface after long-term use, the writing surface is not clear and continue writing There was a problem such as damage to the surface caused by the writing surface of the writing instrument.To solve this problem, the surface of the iron plate cut to the standard was subjected to surface heat treatment, and then washed with an emulsion and the front and rear enamel glazes of the iron plate were removed. After spraying and drying, primary firing is carried out to form the first enamel coating layer, re-spray the enamel glaze on the front of the first enamel coated iron plate, and after drying, second firing is performed to the second enamel coating layer on the front of the iron plate. After forming a printing layer of silk glaze on the entire surface of the second enamel coated with silk glaze, the third glaze is applied to the enamel coating layer. Infiltrate the printed layer and the enamel coating layer by infiltration, attach the coated plywood to prevent the moisture on the back of the iron plate on which the enamel coating and the printing layer are formed, and then press it with a press and assemble it into the frame of the board. It is manufactured.

Description

Learning blackboard with enamel coating layer and manufacturing method thereof

Since this is an open matter, no full text was included.

The accompanying drawings are process drawings showing the manufacturing process.

Claims (3)

The surface of the iron plate cut to the specification is subjected to surface heat treatment at a temperature of about 400 ~ 600 ℃, then washed with an emulsion and pretreated to dry, and then sprayed with enamel glaze on the front and back of the iron plate at about 200 ~ 300 ℃. Dry for about 5 minutes, and first bake at a temperature of about 200 ~ 850 ℃ in the kiln to form a primary enamel coating layer, re-spray the enamel glaze on the front of the primary enamel coated iron plate again at about 200 ~ 300 ℃ After the drying process for about 5 minutes and the secondary firing at a temperature of about 200 ~ 850 ℃ in the sintering furnace to form a secondary enamel coating layer on the front of the iron plate, the silk glaze with enamel glaze, silk oil and pigments added 2 After forming the printing layer of silk glaze on the front surface of the enamel enamel, the third firing is performed at the temperature of about 200 ~ 850 ℃ in the firing furnace so that the silk glaze penetrates the enamel coating layer so that the printing layer and the enamel coating layer are integrated. Coating and phosphorus To prevent warpage of the iron plate due to high and low temperature on the back side of the iron plate on which the chain layer is formed, the coated plywood is bonded with an adhesive, and then pressed with a press, and the enamel coating layer is fabricated by assembling the template of the board. Learning blackboard manufacturing method having a. The method according to claim 1, wherein the pretreatment process for removing impurities before enamel coating is performed by electrolyzing the iron plate cut inside the tank containing the chemicals such as the oxidation solvent and removing the iron plate from the tank. And Method of producing a learning blackboard having an enamel coating layer, characterized in that using the chemical conversion treatment method to dry. Enamel coating layer is formed on the surface of iron plate washed with surface heat treatment and emulsion, secondary enamel coating layer is formed on the front surface, printing layer is formed with silk glaze on the front surface where secondary enamel coating layer is formed, and moisture-proof coating on the back The learning blackboard having an enamel coating layer, characterized in that after being bonded to the blackboard frame assembly. ※ Note: The disclosure is based on the initial application.