Inflation molding apparatus and inflation molding method

An inflation molding apparatus comprising:

• a roll that is disposed on a downstream side of a pair of pinch rolls, changes a tilt of a film that is cylindrical and is transported in a state in which the film is folded by the pinch rolls, and further transports the film to the downstream side, the roll being a tilt-changing roll first changing the tilt of the film folded by the pinch rolls;
• and
• a deaeration roll that punches a hole or makes a slit in the film while rotating in accordance with a movement of the film, as processing for releasing air, which is taken into the film, between the pinch rolls and the tilt-changing roll.

An inflation molding apparatus comprising:

• a roll that is disposed on a downstream side of a pair of pinch rolls, changes a tilt of a film that is cylindrical and is transported in a state in which the film is folded by the pinch rolls, and further transports the film to the downstream side, the roll being a tilt-changing roll first changing the tilt of the film folded by the pinch rolls,
• wherein the tilt-changing roll functions as a deaeration roll that punches a hole or makes a slit in the film as processing for releasing air taken into the film.

An inflation molding method comprising:

• causing a deaeration roll to punch a hole or make a slit in a film, which is cylindrical and is molded by feeding air toward a molten resin extruded into a cylindrical shape, while rotating in accordance with a movement of the film, as preprocessing for causing air, which is taken into the film, to be released to an outside, at a position at which the film is reduced in width to be folded by a pair of pinch rolls and which is closer to the pinch rolls than a position where a width of the film starts to be reduced.

An inflation molding method comprising:

• causing a deaeration roll to punch a hole or make a slit in a film, which is cylindrical and is transported in a state in which the film is folded by a pair of pinch rolls, while rotating in accordance with a movement of the film, as processing for releasing air, which is taken into the film, to an outside between the pair of pinch rolls and a roll which is disposed on a downstream side of the pinch rolls, changes a tilt of the film, and further transports the film to the downstream side, the roll being a tilt-changing roll first changing the tilt of the film folded by the pinch rolls.

An inflation molding method comprising:

• causing a roll to punch a hole or make a slit in a film, which is cylindrical and is transported in a state in which the film is folded by a pair of pinch rolls, as processing for releasing air taken into the film, the roll being disposed on a downstream side of the pair of pinch rolls, changing a tilt of the film, and further transporting the film to the downstream side, the roll being a tilt-changing roll first changing the tilt of the film folded by the pinch rolls.