Resin-tube end formation method and formation tool

A formation tool for forming an end of a resin tube having a cavity, comprising:

• a metal tube having an end surface as a pressing surface for pressing an end surface of the resin tube;
• and
• a metal member that is inserted into the metal tube and is made of a metal needle or a metal wire, wherein:
• the metal member includes a projection projecting from the pressing surface of the metal tube that is insertable into the cavity of the resin tube;
• a shape of the pressing surface is transferred to the end surface of the resin tube by applying thermal energy to the end of the resin tube to form the end of the resin tube into a flange shape without closure of the cavity of the resin tube by the projection.

A resin-tube end formation method including:

• preparing a resin tube for a liquid chromatograph that has an inner diameter of not more than 0.3 mm;
• preparing a formation tool having a pressing surface and a projection that projects from the pressing surface and is insertable into the resin tube, the projection having an outer diameter of not more than 0.3 mm;
• inserting the projection of the formation tool from an end of the resin tube into the resin tube;
• pressing the pressing surface of the formation tool against an end surface of the resin tube;
• and
• transferring a shape of the pressing surface of the formation tool to the end surface of the resin tube by applying thermal energy to the end of the resin tube to form the end of the resin tube into a flange shape without closure of the cavity of the resin tube by the projection.