Oil removal method, bonding method, assembly device, and atmospheric-pressure plasma device

An assembly device comprising:

• an irradiation section configured to irradiate oil attached to a target object made of a resin with a plasma gas containing oxygen plasma that has been plasmatized by atmospheric-pressure plasma;
• a control section configured to control a temperature of the plasma gas to a temperature lower than a melting point of the target object;
• and
• a bonding section configured to bond the target object to an object to be bonded by interposing a bonding agent between a portion of the target object from which the oil has been removed and the object to be bonded.

An atmospheric-pressure plasma device comprising:

• an irradiation section configured to irradiate oil attached to a target object made of a resin with a plasma gas containing oxygen plasma that has been plasmatized by atmospheric-pressure plasma;
• and
• a control section configured to control a temperature of the plasma gas to be a temperature lower than a melting point of the target object,
• wherein the irradiation section has:
• a pair of electrodes configured to generate plasma through discharge,
• a reaction chamber that incorporates the pair of electrodes and includes an outlet through which the plasma gas plasmatized by the pair of electrodes flows out,
• a nozzle block that communicates with the reaction chamber, the nozzle block being configured to eject the plasma gas,
• a cooler that has a gas flow path through which a cooling-heating gas flows, the cooler being configured to cool the reaction chamber, and
• a gas pipe that is connected to the gas flow path and through which the cooling-heating gas flows,
• a heating device that is disposed at the gas pipe, and
• a connecting section that is connected to the gas pipe and has an ejection port in a flow path for the plasma gas,
• wherein the cooling-heating gas heated by the heating device is ejected to the plasma gas from the ejection port so that the plasma gas is heated, and
• wherein the control section controls a temperature of the plasma gas by controlling the heating device.