Method of washing paint cartridge for electrostatic coating apparatus and paint bag

Abstract

Disclosed are a method of washing a paint cartridge for an electrostatic coating apparatus and a paint bag capable of reducing the amount of paint to be discarded when the inside of the paint cartridge is washed for color change. During washing of a paint cartridge (10), air and washing solution are supplied to a squashed paint bag (12) through an upper end opening (12b) thereof so that the paint bag (12) is expanded. When the paint bag (12) is expanded, operating liquid inside an enclosed space (operating liquid chamber; 14) of the paint cartridge (10) is collected through an operating liquid discharge path (26) inside the cartridge. In the next step, the operating liquid is supplied to the operating liquid chamber (enclosed space; 14) of the paint cartridge (10) through an operating liquid supply path (22) inside the cartridge so that the paint bag (12) is squashed, and drives the washing solution to be discharged from a lower end opening (12c) of the paint bag (12).

Description

technical field [0001] The present invention generally relates to an electrostatic coating machine, and more specifically, relates to a cleaning method and a paint bag for a paint cartridge detachably mounted on the main body of the coating machine. Background technique [0002] As an electrostatic coating machine suitable for conductive paints such as water-based paints and metallic paints, a paint cartridge type electrostatic coating machine is known. The paint cartridge type electrostatic paint machine has a paint cartridge detachably attached to the paint machine main body, and paints automobile bodies and the like using conductive paint accommodated in the paint cartridge. The paint cartridge electrostatic paint machine has the advantage of being able to cut off the leakage of high voltage to the outside through the conductive paint. [0003] Conventional electrostatic coating machines that supply paint from an external paint source are broadly classified into rotary a...

AI Technical Summary

Problems solved by technology

As mentioned above, Patent Document 1 proposes a plan of positioning the piston at a position forward of the deepest part to clean the interior of the paint storage chamber restricted by the piston. However, as a problem, Patent Document 2 points out that in this In the method of Patent Document 1, the flow of the cleaning liquid supplied to the paint storage chamber through the cleaning liquid supply port at the bottom of the paint cartridge becomes turbulent, and the interior of the paint storage chamber cannot be cleaned uniformly.

According to Patent Document 2, the following problems are particularly pointed out: it is difficult to wash off the paint that has entered the gap between the side surface of the piston and the side wall of the paint storage chamber, and it takes time to wash off the paint.

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