Heat sealing means
AssigneeThe Dow Chemical Company
InventorRobert A. Hay, II
Life of this patent
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Abstract
Efficient heat sealing, particularly of thicker and/or heat shrinkable plastic materials, is obtained using a fluid heated and cooled heat-sealing member having a body of a material of low thermal conductivity and a strip of material of high thermal conductivity communicating with a heat exchange fluid passage therein.
Claims8
A heat-sealing element, the heat-sealing element comprising a body having a heat-sealing face adapted to be disposed adjacent a film or sheet to be sealed, the body having a thermal conductivity of less than about 30, the body defining a heat-exchange fluid passageway, the heat-exchange fluid passageway having an inlet and an outlet to permit flow of heat-exchange fluid through the passageway, an elongate slot communicating with the heat-exchange fluid passageway and the sealing face of the body, the slot being located in a region wherein it is intended that the sealing face should cause a seal on a workpiece, a heat-sealing member of a metal having a thermal conductivity of at least 175, the heat-sealing member being in liquid-tight sealing engagement with the body, the heat-sealing member being in said slot, the heat-sealing member having a sealing face generally commensurate with the adjacent portion of the sealing face of the body, the heat-sealing member having a fluid-contacting face generally parallel to and remote from the sealing face and in communication with the heat-exchange passage.
A heat-sealing element comprising a stainless steel body having a heat-sealing face adapted to be disposed adjacent a film or sheet to be sealed, the body having a thermal conductivity of less than about 20, the body defining a heat-exchange fluid passageway, the heat-exchange fluid passageway having an inlet and an outlet to permit flow of heat-exchange fluid through the passageway, an elongate slot communicating with the heat-exchange fluid passageway and the sealing face of the body, the slot being located in a region wherein it is intended that the sealing face should cause a seal on a workpiece, a silver heat-sealing member, the heat-sealing member being in liquid-tight sealing engagement with the body, the heat-sealing member being in said slot, the heat-sealing member having a sealing face generally commensurate with the adjacent portion of the sealing face of the body, the heat-sealing member having a fluid-contacting face generally parallel to and remote from the sealing face and in communication with the heat-exchange passage.
Dependencies are inferred from the claim text.