Do You Understand Cover Tape?
Apr. 25, 2020
Cover Tape refers to a band-shaped product used in the field of electronic packaging, used in conjunction with carrier tape. The cover tape usually uses polyester or polypropylene film as the base layer, and is compounded or coated with different functional layers (antistatic layer, an adhesive layer, etc.), which can be sealed on the surface of the carrier tape under external force or heating to form The closed space protects the electronic components in the carrier pocket.
According to the Translucent Leader Tape Supplier tapes, cover tapes are mainly used in the electronic component placement industry. It is used in conjunction with a Carrier Belt (carrying tape) to store electronic components such as resistors, capacitors, transistors, and diodes in a carrier tape pocket. The cover tape is sealed over the pocket formed by the carrier tape to form a closed package for Protect electronic components from pollution and damage during transportation. When the electronic components are mounted, the cover the tape is peeled off, and the automatic mounting equipment takes out the components contained in the pocket in sequence through the accurate positioning of the index hole of the carrier, and places them on the integrated circuit board (PCB).
Peeling force is the most important technical index of cover tape. The placement manufacturer needs to peel the cover tape from the carrier tape, take out the electronic components encapsulated in the pocket and install it on the circuit board. In this process, in order to ensure that the robot can be accurately positioned, the electronic components will not jump or flip, the force of the cover tape peeling from the carrier tape must be stable enough. The size of electronic components manufactured is getting smaller and smaller, so the requirements for the stability of the peeling force are also increasing.
Optical properties include haze, light transmittance, and transparency. Since the mark on the electronic component chip encapsulated in the carrier tape the pocket needs to be observed through the cover tape, there are certain requirements for the light transmittance, haze, and transparency of the cover tape.
In order to prevent electronic components from being attracted to the cover tape by static electricity, the surface of the cover tape usually has antistatic requirements. The level of antistatic is expressed by surface resistance. The surface resistance of the cover tape is generally required to reach 10E9-10E11.
Tensile properties include tensile strength and elongation (percent stretch). Tensile strength refers to the maximum stress that the sample can withstand before breaking. Similarly, elongation refers to the maximum deformation that a material can withstand before breaking. Tensile strength is generally expressed in Newtons/mm (or MPa), and elongation is expressed as a percentage.