A pressure-sensitive adhesive force expressing unit that is configured to heat a pressure-sensitive adhesive label to express pressure-sensitive adhesive force thereof, the pressure-sensitive adhesive label including a printable layer and a pressure-sensitive adhesive layer, the printable layer being provided on one surface of a base, the pressure-sensitive adhesive layer being provided on another surface of the base and covered by a non-pressure-sensitive-adhesive function layer,
- the pressure-sensitive adhesive force expressing unit including:
- a conveyance unit for conveying the pressure-sensitive adhesive label in a predetermined direction;
- a thermal head including a plurality of heat generating elements arranged along a direction substantially orthogonal to the predetermined direction, the thermal head being configured to heat the pressure-sensitive adhesive label from the pressure-sensitive adhesive layer side to form a bore in the non-pressure-sensitive-adhesive function layer and expose the pressure-sensitive adhesive layer;
- and
- a control unit for energizing the plurality of heat generating elements individually to control the plurality of heat generating elements to generate heat, the control unit being configured to control the plurality of heat generating elements to generate heat by providing an intermittent energization period of intermittently energizing the plurality of heat generating elements in a heat generating period of one cycle of forming bores for one row in the non-pressure-sensitive-adhesive function layer.