초록 ▼

A sealing process for producing clean, contamination-free seals. The process includes the step of incorporating a small amount of polar liquid within the material to be sealed between heat-sealable layers. An alternating electromagnetic energy field, such as that produced by a dielectric heating dev

A sealing process for producing clean, contamination-free seals. The process includes the step of incorporating a small amount of polar liquid within the material to be sealed between heat-sealable layers. An alternating electromagnetic energy field, such as that produced by a dielectric heating device, is applied to the seal area. The energy vaporizes the polar liquid, thereby cleaning the seal area. Subsequently, the energy causes the resinous layers to seal together, sealing the material within the package. A preferred composition for sealing within the resinous package is also disclosed. The material includes a polar liquid, a surfactant, wax, oil and microbeads. The material is especially suited for producing padding devices.

대표청구항 ▼

A method for sealing a material within a package comprising: (a) placing a polar liquid-containing material within a package comprising an upper sheet and a lower sheet of heat-sealable material, (b) applying an alternating electromagnetic energy field to a portion of said heat-sealable package usin

A method for sealing a material within a package comprising: (a) placing a polar liquid-containing material within a package comprising an upper sheet and a lower sheet of heat-sealable material, (b) applying an alternating electromagnetic energy field to a portion of said heat-sealable package using a device having electrodes, (c) vaporizing at least a portion of said polar liquid effective to clear the seal area of contaminating material by forcing said contaminating material out from between said sheets in a direction away from the seal area, without causing undesirable arcing between said electrodes, and (d) continuing said application of said alternating electromagnetic energy field until said portion of said heat-sealable package is sealed. A sealing process comprising: (a) vacuum molding a first piece of resinous material in order to achieve a desired shape, (b) placing flowable, pressure-compensating material within said vacuum molded resinous material, said flowable, pressure-compensating material containing from 0.5 weight percent to about 5 weight percent water, (c) placing a second piece of resinous material adjacent said first vacuum molded piece, (d) removing air from between the two pieces of resinous material, (e) applying radio frequency energy using a device having electrodes to overlapping edges of said two pieces of resinous materials until said water in said flowable, pressure-compensating material vaporizes in order to clear the seal area of flowable, pressure-compensating material by forcing said material out from between said two pieces of resinous material in a direction away from the seal area, without causing undesirable arcing between said electrodes, and (f) continuing said radio frequency energy until portions of said two pieces of resinous material seal together.