Heat activation method of thermosensitive adhesive label and heat-activating apparatus for the same

An apparatus for heat-activating a thermosensitive adhesive label comprising a support and a thermosensitive adhesive layer which is formed on said support and is not adhesive at room temperature, so as to make said thermosensitive adhesive layer adhesive with the application of heat thereto, comprising:

• transporting means for transporting said thermosensitive adhesive label;
• and
• heating means comprising a heating medium, for heating said thermosensitive adhesive layer of said thermosensitive adhesive label by bringing said thermosensitive adhesive layer into contact with a surface portion of said heating medium, at least said surface portion of said heating medium consisting essentially of a silicone resin and having a peel strength of 2 g/mm or less with respect to said thermosensitive adhesive layer, which is measured by applying said thermosensitive adhesive layer to said surface portion of said heating medium, heating said thermosensitive adhesive layer to 90.degree. C. for one minute under the application of a load of 2 kg thereto, and measuring the force required to peel said thermosensitive adhesive layer from said surface portion of said heating medium under T-peel condition at room temperature at a peeling speed of 300 mm/minute, wherein said pressure-application member comprises a surface portion comprising an elastic material with a spring type hardness of 50.degree. or less when measured using a spring type hardness tester type A in accordance with the Japanese Industrial Standard JIS K6301.

An apparatus for heat-activating a thermosensitive adhesive label comprising a support and a thermosensitive adhesive layer which is formed on said support and is not adhesive at room temperature, so as to make said thermosensitive adhesive layer adhesive with the application of heat thereto, comprising:

• transporting means for transporting said thermosensitive adhesive label;
• and
• heating means comprising a heating medium, for heating said thermosensitive adhesive layer of said thermosensitive adhesive label by bringing said thermosensitive adhesive layer into contact with a surface portion of said heating medium, at least said surface portion of said heating medium consisting essentially of a silicone resin and having a peel strength of 2 g/mm or less with respect to said thermosensitive adhesive layer, which is measured by applying said thermosensitive adhesive layer to said surface portion of said heating medium, heating said thermosensitive adhesive layer to 90.degree. C. for one minute under the application of a load of 2 kg thereto, and measuring the force required to peel said thermosensitive adhesive layer from said surface portion of said heating medium under T-peel condition at room temperature at a peeling speed of 300 mm/minute, wherein said pressure-application member comprises a surface portion comprising an elastic material with a spring type hardness of 90.degree. or less when measured using a spring type hardness tester C in accordance with the Japanese Industrial Standard JIS K6301.

An apparatus for heat-activating a thermosensitive adhesive label comprising a support and a thermosensitive adhesive layer which is formed on said support and is not adhesive at room temperature, so as to make said thermosensitive adhesive layer adhesive with the application of heat thereto, comprising:

• transporting means for transporting said thermosensitive adhesive label;
• and
• heating means comprising a heating medium, for heating said thermosensitive adhesive layer of said thermosensitive adhesive label by bringing said thermosensitive adhesive layer into contact with a surface portion of said heating medium, at least said surface portion of said heating medium consisting essentially of a silicone resin and having a peel strength of 2 g/mm or less with respect to said thermosensitive adhesive layer, which is measured by applying said thermosensitive adhesive layer to said surface portion of said heating medium, heating said thermosensitive adhesive layer to 90.degree. C. for one minute under the application of a load of 2 kg thereto, and measuring the force required to peel said thermosensitive adhesive layer from said surface portion of said heating medium under T-peel condition at room temperature at a peeling speed of 300 mm/minute, wherein said heating means comprising said heating medium and said pressure-application member is designed so that said pressure-application member is attachable to said heating medium via said thermosensitive adhesive label in the course of said heat activation of said thermosensitive adhesive layer, and is detachable therefrom while said thermosensitive adhesive layer is not subjected to said heat activation process.