초록 ▼

A vacuum package tester is capable of providing data by which the internal pressure and volume of residual gas of a flexible wall vacuum package exposed to atmospheric pressure may be calculated. A container partially filled with liquid is surrounded by a deformation-absorbing enclosure. A vacuum pu

A vacuum package tester is capable of providing data by which the internal pressure and volume of residual gas of a flexible wall vacuum package exposed to atmospheric pressure may be calculated. A container partially filled with liquid is surrounded by a deformation-absorbing enclosure. A vacuum pump reduces the pressure in the head space above the liquid, thereby causing a submerged package to expand. Pressure gauges record the respective pressures in the head space when the package expands by first and second known volumes. From this data, the internal pressure and volume of residual gas of said package, when exposed to ambient pressure and temperature, may be calculated. In use, the invention also performs an improved method.

대표청구항 ▼

Apparatus for providing data by which the internal pressure of residual gas in a flexible-wall vacuum package exposed to a known external pressure may be calculated, comprising: a container having a removable enclosure, said container being partially filled with a liquid; a package-to-be-tested comp

Apparatus for providing data by which the internal pressure of residual gas in a flexible-wall vacuum package exposed to a known external pressure may be calculated, comprising: a container having a removable enclosure, said container being partially filled with a liquid; a package-to-be-tested completely submerged in said liquid; a vacuum pump operatively arranged to selectively reduce the pressure acting on the surface of said liquid; a first indicator for indicating when the volume occupied by said package has increased by a first known volume; a second indicator for indicating when the volume occupied by said package has increased by a second known volume; and at least one pressure indicator operatively arranged to indicate the respective pressures acting on the surface of said liquid when the volume occupied by said package has increased by said first and second known volumes; whereby the internal pressure of residual gas in said package when exposed to a known external pressure may be calculated as a function of said external pressure, said known volumes and said indicated pressures.