Method for the separation and breaking seal hybrid seal

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A method of forming a composite seal structure having great resistance to rupture, rare generation of pinholes is provided which comprises using a heat sealer having two blocks which presses sheets to be heat-sealed and at least one of which is a heating block provided with a seat which renders its surface at a temperature forming peel seal, on a part of its surface pressing the sheets, heating the heating block at a temperature forming tear seat, and pressing the sheets to form a heat seal having the composite seal structure of peel seal and tear seal.