Heat-sealable sheets and sterile packaging

Abstract

To provide a heat-sealable sheet and sterile packaging that can reliably prevent the entry of bacteria even if the temperature, pressure, and other conditions during heat bonding differ to some extent, and that maintains stable peel strength even in high-temperature environments, allows for easy peeling with minimal substrate damage during peeling, and leaves a peeling mark after opening. [Solution] A heat seal sheet (10) comprising a breathable substrate (11) and a heat-adhesive layer (12) provided on either side of the breathable substrate, wherein the heat-adhesive layer contains a thermoplastic resin, carnauba wax and a rosin compound, the amount of carnauba wax being 1.0 to 30 parts by mass per 100 parts by mass of the thermoplastic resin, the amount of rosin compound being 2.0 to 60 parts by mass per 100 parts by mass of the thermoplastic resin, and the amount of rosin compound being 2.0 to 5.5 times the amount of carnauba wax.

Claims

1. A heat seal sheet comprising a breathable substrate and a heat-adhesive layer provided on either one surface of the breathable substrate, The heat-bonding layer contains a thermoplastic resin, carnauba wax, and a rosin compound. The amount of carnauba wax is 1.0 to 30 parts by mass per 100 parts by mass of the thermoplastic resin. The content of the rosin compound is 2.0 to 60 parts by mass per 100 parts by mass of the thermoplastic resin. The content of the rosin compound is 2.0 to 5.5 times the content of the carnauba wax. The Wangyan air permeability resistance, measured according to JIS P 8117:2009, is 700 seconds or less. Heat seal sheet.

2. The aforementioned breathable substrate is paper containing polyacrylamide resin. The heat seal sheet according to claim 1.

3. The thermoplastic resin is a copolymer of ethylene and an unsaturated carboxylic acid compound. The heat seal sheet according to claim 1.

4. The copolymer of ethylene and the unsaturated carboxylic acid compound is at least one selected from the group consisting of ethylene-unsaturated carboxylic acid copolymers, ethylene-unsaturated carboxylic acid ester copolymers, and ethylene-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymers. The heat seal sheet according to claim 3.

5. A heat seal sheet according to any one of claims 1 to 4 is included as at least a part thereof. Sterile packaging.

6. A sterile packaging body comprising a heat-seal sheet according to any one of claims 1 to 4 and a containment space forming body, A heat-adhesive layer provided on at least one side of the heat-seal sheet faces the side of the accommodating space forming body, A portion of the heat-seal sheet and a portion of the containment space forming body are heat-bonded together by the heat-bonding layer, forming a heat-bonded portion. Sterile packaging.

7. The aforementioned containment space forming body is polyvinyl chloride. The sterile packaging according to claim 6.

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