Abstract: A method for preventing microorganism multiplication, including using a gas containing a low concentration of ozone and a high concentration of ions, so that the multiplication of microorganisms can be safely and fully prevented by an additive effect of the ozone and ions. The generation of ozone is suppressed by reducing the discharge current in the ionization chamber using a pulse converter, which is provided to control the current flowing at the time of discharge, when generating the ions and ozone in the ionization chamber. Ions are produced in the ionization chamber in a high concentration to produce and supply ionized gas containing a low concentration of ozone and a high concentration of ions, which prevents microorganism multiplication on the objects.

Abstract: Disclosed is a squeeze vessel having a good combination of deformability, memory property and interlaminar peel resistance, suitable for squeezing out the content, and being excellent in content preserving property, flavor retaining property and appearance characteristics. This squeeze vessel comprises a laminate structure including at least one layer composed mainly of at least one member selected from the group consisting of ethylene-vinyl alcohol copolymers and polyamides, at least one layer composed mainly of an olefin resin having an elasticity of 900 to 9000 Kg/cm.sup.