Cleaning method
First Claim
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1. A cleaning method by high-pressure jet cleaning or two-fluid cleaning, comprising:
- a step of jetting a cleaning liquid or a mixed fluid of the cleaning liquid and a carrier gas from a jetting nozzle toward a subject of an electronic material to be cleaned and thereby cleaning the subject,wherein the cleaning liquid is at room temperature,the cleaning liquid introduced into the jetting nozzle contains a dissolved gas prepared by dissolving a gas in degassed water with a gas-dissolving membrane module in a quantity of 1.5 to 3 times as large as a saturation solubility at a temperature of the cleaning liquid,a pressure in a feed water piping connecting the gas-dissolving membrane module and the jetting nozzle is controlled thereby to prevent generation of bubbles in the cleaning liquid,the gas is supplied to a gas-phase room of the gas-dissolving membrane module through a gas supply piping having a gas flow regulating valve,the gas-phase room has a first pressure indicator measuring a pressure V1 in the gas-phase room,the feed water piping has a feed water regulating valve and a second pressure indicator measuring a water feed pressure V2 at a downstream side relative to the feed water regulating valve, andV1<
V2 is satisfied with the gas flow regulating valve and the feed water regulating valve.
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Abstract
Disclosed is a low-cost and resource-saving cleaning method wherein high cleaning effects are obtained by high-pressure jet cleaning or two-fluid cleaning using a gas-dissolved water. In the high-pressure jet cleaning method or the two-fluid cleaning method, a cleaning liquid or a mixed fluid of the cleaning liquid and a gas is jetted from a cleaning fluid jetting nozzle toward a subject to be cleaned, and the subject is cleaned. The cleaning liquid introduced into the cleaning fluid jetting nozzle contains the dissolved gas in a quantity equal to or more than the saturation solubility at the liquid temperature of the cleaning liquid.
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Citations
9 Claims
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1. A cleaning method by high-pressure jet cleaning or two-fluid cleaning, comprising:
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a step of jetting a cleaning liquid or a mixed fluid of the cleaning liquid and a carrier gas from a jetting nozzle toward a subject of an electronic material to be cleaned and thereby cleaning the subject, wherein the cleaning liquid is at room temperature, the cleaning liquid introduced into the jetting nozzle contains a dissolved gas prepared by dissolving a gas in degassed water with a gas-dissolving membrane module in a quantity of 1.5 to 3 times as large as a saturation solubility at a temperature of the cleaning liquid, a pressure in a feed water piping connecting the gas-dissolving membrane module and the jetting nozzle is controlled thereby to prevent generation of bubbles in the cleaning liquid, the gas is supplied to a gas-phase room of the gas-dissolving membrane module through a gas supply piping having a gas flow regulating valve, the gas-phase room has a first pressure indicator measuring a pressure V1 in the gas-phase room, the feed water piping has a feed water regulating valve and a second pressure indicator measuring a water feed pressure V2 at a downstream side relative to the feed water regulating valve, and V1<
V2 is satisfied with the gas flow regulating valve and the feed water regulating valve. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cleaning method by two-fluid cleaning, comprising:
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supplying raw water to a degassing membrane module; degassing the raw water through the degassing membrane module, thereby producing degassed water; supplying the degassed water to a gas-dissolving membrane module and supplying a gas to a gas-phase room of the gas-dissolving membrane module, thereby producing a gas-dissolved water; supplying a carrier gas to the gas-dissolved water, thereby producing a mixture of the gas-dissolved water and the carrier gas; jetting the mixture from a jetting nozzle toward a subject of a material to be cleaned, thereby cleaning the subject; and controlling a pressure in a feed water piping connecting the gas-dissolving membrane module and the jetting nozzle at a predetermined pressure, thereby preventing generation of bubbles in the gas-dissolved water, wherein the gas-dissolved water contains the gas in a quantity of 1.5 to 3 times as large as a saturation solubility at the temperature of the gas-dissolved water, the gas-phase room has a gas supply piping having a gas flow regulating valve and a first pressure indicator measuring a pressure V1 in the gas-phase room, the gas is supplied to the gas-phase room through the gas supply piping, the feed water piping has a feed water regulating valve and a second pressure indicator measuring a water feed pressure V2 at a downstream side relative to the feed water regulating valve, and V1<
V2 is satisfied with the gas flow regulating valve and the feed water regulating valve. - View Dependent Claims (9)
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Specification