What is a Carrier Bag? What are the Types of Bags?
Apr. 15, 2020
What is a Carrier Bag? The Antistatic Pads Supplier introduces you to carrier tape (Carrier Tape) refers to a band-shaped product used in the field of electronic packaging, which has a specific thickness, and is equidistantly distributed in the length direction for holding electronic components Holes (also called pockets) and positioning holes for index positioning.
The carrier tape is mainly used in the electronic component placement industry. It is used in conjunction with a cover tape (upper sealing tape), which carries electronic components such as resistors, capacitors, transistors, diodes, etc. in a pocket of the carrier tape, and forms a closed package by sealing the cover tape above the carrier tape. Protect electronic components from pollution and damage during transportation. When the electronic components are mounted, the cover 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).
The carrier bag is divided by width, and the carrier tape is also divided into different widths according to the size of the electronic components carried by the package. Common widths are 8mm, 12mm, 16mm, 24mm, 32mm, 44m, 56mm, etc. With the development of the electronic market, chips have become smaller and smaller, and carrier tapes have also developed in the direction of precision. There are already 4 mm wide carrier tapes on the market.
According to the function of the carrier bag, embossed carrier tape (embossed carrier tape) and punched carrier tape (punched carrier tape). Embossed carrier tape means that the carrier tape material is partially stretched by mould imprinting or blister to form a pocket with a concave shape. This carrier tape can be formed into pockets of different sizes according to specific needs to suit the storage The size of electronic components; stamping carrier tape refers to punching or semi-penetrating pockets formed by die-cutting. The thickness of the electronic components that this carrier tape can hold is limited by the thickness of the carrier tape itself, and can generally only be used for Pack smaller components.
According to the material of the carrier tape, the material of the carrier tape mainly includes two types: plastic (polymer) and paper. The embossed carrier tape is mainly composed of plastic materials, the mainstream on the market is PC (Polycarbonate, polycarbonate) carrier tape, PS (Polystyrene, polystyrene) and ABS (acrylonitrile-butadiene-styrene copolymer resin) carrier, In addition, there are also a small number of carrier tapes made of PET, APET and other materials. The stamping carrier tape is mainly made of paper material or PE composite material.
PC materials are characterized by high mechanical strength, good transparency, good dimensional stability, high glass transition temperature, and good heat resistance. The mechanical strength of the PS material is lower than that of the PC material, so it is sometimes made into a three-layer composite sheet with the ABS material to improve the tensile strength of the carrier tape. The mechanical strength of the PET material is close to that of the PC, but due to the crystalline material, the dimensional stability is poor .
According to the forming method of the carrier tape, according to the forming method of the bag, it can be divided into two types of forming methods: intermittent type (flat plate moulding type) and continuous type (roller rotating type). Compared with the batch type, the continuous moulding method has better dimensional stability and higher dimensional accuracy. For batch moulding, it is more suitable for preparing large-sized pockets.