PRESSURE-SENSITIVE ADHESIVE SHEET
Provided is a PSA sheet that allows installation of a protection sheet with good shape precision on the surface of an object to be protected. The PSA sheet provided by this invention comprises a substrate whose primary component is a resin film and a PSA layer placed on one face of the substrate. The PSA sheet comprises a protection sheet part which is adhered to an adherend to protect it, a marginal part bounded from the protection sheet part by a tear-off line surrounding the protection sheet part, and a tear-aiding structure provided along the tear-off line. The PSA sheet is configured so that after the protection sheet part is adhered to the adherend, when the marginal part is pulled in a direction in which the PSA sheet is peeled off the adherend, the marginal part is tom off the protection sheet part.
1 . A pressure-sensitive adhesive sheet comprising a substrate and a pressure-sensitive adhesive layer placed on a first face of the substrate, wherein
the pressure-sensitive adhesive sheet comprises a protection sheet part to be adhered to an adherend to protect the adherend, a marginal part bounded from the protection sheet part by a tear-off line surrounding the protection sheet part, and a tear-aiding structure provided along the tear-off line,
the substrate comprises a resin film as its primary component, and
the pressure-sensitive adhesive sheet is configured so that after the protection sheet part is adhered to the adherend, when the marginal part is pulled in a direction in which the pressure-sensitive adhesive sheet is peeled off the adherend, the marginal part is torn off the protection sheet part.
2 . The pressure-sensitive adhesive sheet according to claim 1 being long and wound in a roll, and comprising a plurality of the protection sheet parts serially arranged in the length direction of the pressure-sensitive adhesive sheet.
3 . The pressure-sensitive adhesive sheet according to claim 1 , wherein the tear-aiding structure comprises at least a cut hole or a groove.
4 . The pressure-sensitive adhesive sheet according to any one of claim 1 , wherein the tear-aiding structure comprises at least a groove running along the tear-off line.
5 . The pressure-sensitive adhesive sheet according to any one of claim 1 , wherein the groove bottom in the substrate is formed with a resin material having a tensile modulus of 300 MPa or greater.
6 . The pressure-sensitive adhesive sheet according to any one of claim 1 , wherein the substrate comprises a polyolefinic resin film as the resin film.
7 . The pressure-sensitive adhesive sheet according to any one of claim 1 , wherein the protection sheet part exhibits a 180° peel strength of 3 N/25 mm or greater.
8 . The pressure-sensitive adhesive sheet according to any one of claim 1 , comprising a plurality of application units divided by separation lines, with each application unit comprising at least one each of the protection sheet part and the marginal part surrounding the protection sheet part.
9 . The pressure-sensitive adhesive sheet according to any one of claim 1 , wherein the marginal part is provided with a positioning assistant to assist positioning of the pressure-sensitive adhesive sheet.
10 . A method for producing a protection sheet-bearing member in which a protection sheet is adhered to the surface of the member, the method comprising:
obtaining a pressure-sensitive adhesive sheet comprising a substrate whose primary component is a resin film and a pressure-sensitive adhesive layer placed on a first face of the substrate, wherein the pressure-sensitive adhesive sheet comprises a protection sheet part to be adhered to an adherend to protect the adherend, a marginal part bounded from the protection sheet part by a tear-off line surrounding the protection sheet part, and a tear-aiding structure provided along the tear-off line;
adhering the protection sheet part to the member; and
pulling the marginal part in a direction in which the pressure-sensitive adhesive sheet is peeled off the member, thereby tearing the marginal part off the protection sheet part leaving the protection sheet part on the member.
11 . A method for applying a protection sheet to a surface of a member, the method comprising:
obtaining a pressure-sensitive adhesive sheet that comprises a substrate whose primary component is a resin film and a pressure-sensitive adhesive layer placed on a first face of the substrate wherein the pressure-sensitive adhesive sheet comprises a protection sheet part to be adhered to an adherend to protect the adherend, a marginal part bounded from the protection sheet part by a tear-off line surrounding the protection sheet part, and a tear-aiding structure provided along the tear-off line;
adhering the protection sheet part to the member, and
pulling the marginal part in a direction in which the pressure-sensitive adhesive sheet is peeled off the member, thereby tearing the marginal part off the protection sheet part leaving the protection sheet part on the member.