Pressure-sensitive adhesive force expressing unit, pressure-sensitive adhesive label issuing device, and printer

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 thermal head including a plurality of heat generating elements arranged along a width direction of the pressure-sensitive adhesive label, the thermal head being configured to heat the pressure-sensitive adhesive label, which is conveyed along a conveyance direction, from the pressure-sensitive adhesive layer side to form openings in the non-pressure-sensitive-adhesive function layer by the plurality of heat generating elements and expose the pressure-sensitive adhesive layer;
• and
• a control unit for applying heat energy to the plurality of heat generating elements individually to control heat generation thereof, the control unit being configured to control the application of heat energy to the plurality of heat generating elements so that a plurality of opening lines in each of which the openings are arranged in the width direction of the pressure-sensitive adhesive label are formed in the conveyance direction and to control, in order to form each of the plurality of opening lines, the application of heat energy so that adjacent at least two of the plurality of heat generating elements generate heat at the same time to form an opening group in which the openings are connected together in the width direction.