Patent ID: 8609200
Filing Date: 2013-12-17
Classification: B29C,F16L,Y10T

Abstract:
1. A method of manufacturing a hose, including a connecting portion on an end part of the hose, a resin layer as an inner layer of the hose and a sealing layer of an elastic material, the method comprising: generating a plasma gas outside the hose, by glow discharge between a pair of electrodes; performing an atmospheric plasma treatment by sending the plasma gas generated outside the hose to an inner surface of the inner layer of the connecting portion to modify the inner surface by action of the plasma gas; and coating the sealing layer on the inner surface to bond the sealing layer to the inner surface, wherein, in sending the plasma gas, an abutting member is used, against which the end part of the hose abuts, the abutting member having an insertion portion into which the end part of the hose is inserted through an opening end of the insertion portion, a gas introducing portion extending from an end of the insertion portion opposite from the opening end and penetrating through the abutting member, and a blocking portion provided at a position between the insertion portion and the gas introducing portion and configured to block the plasma gas introduced through the gas introducing portion from passing to an outer surface of the hose, a cross-section area of the insertion portion being larger than a cross-section area of the gas introducing portion and larger than a cross-section area of the hose, the insertion portion, the gas introducing portion and the blocking portion comprising a single integrated structure, wherein the plasma gas being introduced into the gas introducing portion of the abutting member, is introduced to the inner surface of the inner layer of the connecting portion through the gas introducing portion, to perform the atmospheric plasma treatment, and wherein the sending the plasma gas comprises: inserting the end part of the hose into the insertion portion through the opening end of the insertion portion in a direction opposite to a direction in which the plasma gas is introduced to the inner surface; and abutting the end part of the hose against the blocking portion of the abutting member, such that the inner surface of the tube communicates with the gas introducing portion and the outer surface of the hose does not communicate with the gas introducing portion due to contact of the blocking portion with the hose.