Packaging methods of SMT surface assembly components
The packaging methods of surface assembly components has become an important link in SMT system. It affects the efficiency of assembly and production directly, and must be optimized in combination with the type and quantity of SMT feeder.There are four main types of packaging for surface-assembled components: braided, tubular, pallet and bulk, it is recommended to choose the form of express braid packaging in mass production;Low production or prototype production, pipe installation is recommended;Bulk is rarely used as the bulk must be picked up one by one or repackaged with assembly equipment.FASTPCBA shares the following packaging methods:
Braided packaging is the most widely used, the longest time, strong adaptability, high efficiency of a form of packaging, and has been standardized.All components except QFP, PLCC and LCCC are packaged in this way.Braid mainly used in braid package are paper, plastic bags and adhesive tape these three types.Paper tape is mainly used for packaging chip-resistance, chip-capacitance;Plastic bags are used for packing various kinds of chi-components such as pin free components, composite components, abnormal-shaped components, SOT, SOP, small size QFP, etc.
Tube type packaging is mainly used to package rectangular chip-resistance, chip-capacitance, some abnormal shape and small components, mainly used for SMT components of large variety and small batch occasions.The components are overlapped in the same direction and then loaded into the plastic tube once when packaging, (generally 100 ~ 200 pieces/tube). The two ends of the tube are inserted into the feeder of the SMT machine with a stop bolt. The cover of the mounting box is removed.Then, each time the tube is pressed, a chip component is provided to the substrate according to the mounting procedure.
The cost of tubular packaging materials is high and the quantity of packaged components is limited.At the same time, if the mounting pressure of each tube is not balanced, the components are easy to get stuck in the narrow tube.However, for surface assembly IC, the cost of tube packaging is lower than pallet packaging, but the speed of mounting is not as fast as the braiding method.
Circuit board assembly component packaging methods
1.Pallet packaging is to use rectangular diaphragm to make the pallet according to the provisions of the cavity, and then the components one by one into the plate, the general 50 pcs/ plate, cover the protective film.Pallet has a single layer, three layers, ten layers, twelve layers, twenty-four layers of automatic feed pallet feeder.When this packaging method is applied, it is mainly used to package medium, high and multi-layer ceramic capacitors with large shape. At present, it is also used to package SOP, QTP and other components with large quantity of leads
Pallet packaging has hard disk and floppy disk.The hard disk is often used to package QTP components with multiple pins and fine spacing, so that the lead wire of the package body is not easy to deform.The floppy disk is used to package common abnormal shaped chip-components.
Bulk packaging is to seal chip-components freely into the molding of the plastic box or bag, the plastic box into the material rack when mounting, the usage of feeder or feeding tube so that the components one by one into the feeder entrance.This method of packaging is of low cost, small size, but the application scope is small, mostly apply to cylindrical resistance.
The packaging form of SMT components is very critical, which directly affects the efficiency of assembly and production. It must be combined with the type and quantity of SMT feeder for optimal design.
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