Peel Force
Peel force is the most critical technical parameter for cover tape. Assembly manufacturers must peel the cover tape away from the carrier tape to retrieve the electronic components encapsulated within the pockets and mount them onto a circuit board. During this process, to ensure that robotic manipulators can achieve precise positioning-and to prevent the electronic components from shifting or flipping over-the force required to peel the cover tape from the carrier tape must be sufficiently stable. As the size of manufactured electronic components continues to shrink, the requirements for peel force stability are becoming increasingly stringent.
Optical Properties
Optical properties encompass haze, light transmittance, and transparency. Since it is necessary to visually inspect the markings on the electronic component chips encapsulated within the carrier tape pockets through the cover tape, specific requirements regarding the cover tape's light transmittance, haze, and transparency must be met.
Surface Resistivity
To prevent electronic components from being electrostatically attracted to the cover tape, the tape's surface typically requires anti-static properties. The level of anti-static performance is quantified by its surface resistivity. Generally, the surface resistivity of the cover tape is required to fall within the range of 10⁹ to 10¹¹ ohms.
Tensile Properties
Tensile properties include tensile strength and elongation (percentage elongation). Tensile strength refers to the maximum stress a sample can withstand before fracturing. Similarly, elongation refers to the maximum deformation a material can undergo before fracturing. Tensile strength is typically expressed in Newtons per millimeter (or Megapascals), while elongation is expressed as a percentage.
