초록 ▼

A product in the form of a cushioning device made from thermoplastic film containing crystalline material inflated to a relatively high pressure and sealed at the time of manufacture. The product maintains the internal inflatant pressure for long periods of time by employing a form of the diffusion

A product in the form of a cushioning device made from thermoplastic film containing crystalline material inflated to a relatively high pressure and sealed at the time of manufacture. The product maintains the internal inflatant pressure for long periods of time by employing a form of the diffusion pumping phenomenom of self-inflation in which the mobile gas is the gas components of air other than nitrogen. Improved and novel cushioning devices use new material, for the film of the enclosure nevelope which can selectively control the rate of diffusion pumping, thereby permitting a wider latitude flexibility and greater accuracy in the design of such new cushioning device, thus improving the performance and reducing cost of such devices while elminating some of the disadvantages of the earlier products. It is possible to permanently inflate certain types of new devices using readily available gases such as nitrogen, or air in which case nitrogen forms the captive gas.

대표청구항 ▼

A load carrying gas pressurized cushioning device comprising: a sealed envelope having at least one chamber formed by at least spaced wall portions of a film like material; said film like material being plastic and polar and elastomeric and having gas diffusion properties of a partially crystalline

A load carrying gas pressurized cushioning device comprising: a sealed envelope having at least one chamber formed by at least spaced wall portions of a film like material; said film like material being plastic and polar and elastomeric and having gas diffusion properties of a partially crystalline film material; said envelope being initially pressurized to a predetermined pressure by at least a captive gas with respect to which said film like material acts as a barrier to retard diffusion of the captive gas therethrough; said film material being characterized by the ability to retain said captive gas to maintain said device at least partially pressurized and to permit diffusion therethrough of a mobile gas; and the internal pressure of said envelope being the sum of the partial pressures of the mobile and captive gases.