Tube-shaped film having its inner peripheral surface treated, method for treating inner peripheral surface of tube-shaped film and apparatus therefor

An apparatus for treating an inner peripheral surface of a tube-shaped film, said apparatus comprising:

• a suction/holding means having an inner cylinder having a plurality of holes formed therein to hold the tube-shaped film thereon by sucking the tube-shaped film thereto, and an outer cylinder surrounding said inner cylinder and connected with a negative pressure source to form a negative space between said inner cylinder and said outer cylinder;
• a first driving means for driving said suction/holding means so that said suction/holding means makes a uniform linear motion along the axis thereof;
• a second driving means for driving said suction/holding means so that said suction/holding means makes a uniform rotary motion around said axis thereof;
• and
• a treatment means for treating the inner peripheral surface of the tube-shaped film held by said suction/holding means, according to the linear motion and the rotary motion of said suction/holding means.

A method of treating an inner peripheral surface of a tube-shaped film, said method comprising the steps of:

• a first step of holding said tube-shaped film made of fluorine resin on the inner peripheral surface of a holding cylinder having a large number of holes, by means of a negative pressure generated between said holding cylinder and an outer cylinder;
• a second step of supplying said inner peripheral surface of said tube-shaped film with a pre-treatment solution containing an ultraviolet-absorbing compound and fluorosurfactant and attaching said pre-treatment solution thereto by means of a supply means inserted into said holding cylinder holding said tube-shaped film, by linearly moving said holding cylinder and said supply means relative to each other at a uniform speed along the axis of said holding cylinder and rotating said holding cylinder and said supply means relative to each other at a uniform speed around said axis of said holding cylinder;
• and
• a third step of irradiating said inner peripheral surface of said tube-shaped film to which said pre-treatment solution has been attached with ultraviolet laser beams by refracting said ultraviolet laser beams guided along the axial direction of said holding cylinder toward said inner peripheral surface of said tube-shaped film by means of an optical means inserted into said holding cylinder holding said tube-shaped film, by linearly moving said holding cylinder and said optical means relative to each other at a uniform speed along said axis of said holding cylinder and rotating said holding cylinder and said optical means relative to each other at a uniform speed around said axis of said holding cylinder.