Adhesive tape and producing method thereof

A closing tape prevents winding looseness of a roll photo film and a light-tight sheet which are wound around a spool. After an adhesive agent layer formed on one end of the closing tape is adhered to a surface of the light-tight sheet, an adhesive agent layer formed on the other end of the closing tape is adhered to a surface of the closing tape. The adhesive agent layer consists of multiple adhesive dots. The respective dots are formed by heat sensitive adhesive agent filled in the respective cells of a gravure roll to coat on the closing tape by gravure coating. Adhesive force is stabilized due to uniformity in size and thickness of the dots. Moreover, the cells are provided at same intervals and heat sensitive adhesive agent having optimum viscosity is used, so that the adjacent dots are prevented from connecting each other.