Label formation base material pair and tack labeler

A label formation base material pair for forming tack labels having a predetermined shape, comprising:

• a pair of opposing elongated label formation base materials, each of the base materials being configured to cut therefrom the tack labels and each of the base materials including at least a base layer and an adhesive layer, the base materials being detachably adhered to each other on respective adherence surface sides of the adhesive layers, the adhesive layers of the label formation base materials each including elongate bands of adhesive areas, which alternate with elongate bands of non-adhesive areas, an adhesive area of one of the label formation base materials is attached to a non-adhesive area of the opposing label formation base material;
• each of the label formation base materials having formed thereon, successively in a direction of elongation of the label formation base materials and at a predetermined interval, cut lines that define an interior area portion in the shape of the tack labels, the cut lines formed on opposing label formation base materials at the same predetermined interval defining interior area portions having the same shape as each other, each interior area portion being defined by a single continuous cut line and each cut line defining a single uncut connection portion between opposing ends of the cut line, the connection portion being located at one end side of the tack labels in the direction of elongation where opposing connection portions are pulled away opposite from each other in a peeling direction of the opposing elongated label formation base materials;
• the cut lines formed on one of the label formation base materials and the cut lines formed on the other label formation base material being shifted in position so as not to match each other;
• and
• the pair of elongated label formation base materials being configured to facilitate removal of the tack labels via movement in an advancing direction along the direction of elongation, each connection portion being disposed forward of its corresponding cut line in the advancing direction and the connection portion being configured to allow the interior area portion to be detached from the opposing base material upon separation of the base materials, the interior area portions being removable as the tack labels from the remainder of each of the base materials when the connection portions are cut, and wherein each of the tack labels removed from the base materials includes at least a base layer and an adhesive layer, and each tack label has the same shape.