Method of forming a composite heat seal structure
OwnerKazuo Hishinumainventor
Life of this patent
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Abstract
A compound heat seal structure that, when heat-sealing a bag with a stacked area level difference, reliably seals even a section having different level and that can be easily opened. A compound heat seal structure is provided as a peelable seal in a band shape on a bag and a linear heat seal is added as a peelable seal in that band-shaped peelable heat seal in the longitudinal direction thereof.
Claims9
A method of heat-sealing a heat-sealing material using a heat seal apparatus which nips the heat-sealing material between a pair of heating surfaces, wherein a linear rib having an arc-shaped cross section with a height of 0.05-2 mm is provided in a longitudinal direction of a first of the heating surfaces, and an elastic body is mounted on only a second of the heating surfaces, the method comprising:
- heat sealing the heat-sealing material with the heating surfaces at a temperature to form a peelable seal without melting the heat-sealing material, to form a heat seal having a composite heat seal structure comprising a band-shaped peelable heat seal defining a longitudinal direction along its length and a linear peelable heat seal in the band-shaped peelable heat seal in said longitudinal direction;
- wherein a width and a depth of the linear peelable heat seal is the same as a width and the height of the linear rib;
- and
- wherein said heat-sealing material comprises a step portion, and said heat-sealing the heat-sealing material comprises heat sealing the step portion.
Dependencies are inferred from the claim text.