Pcb manufacturing is a complex and comprehensive system engineering technology involving factors of aluminum substrate manufacturing, components, printed craft materials, assembly technology, highly automated assembly, and inspection equipment etc,. Among them, Pcb manufacturing equipment is high-precision electromechanical integration equipment. The solder paste and SMD-adhesive in Pcb manufacturing craft materials are all thixotropic fluids, and they have certain requirements on the cleanliness, humidity and temperature of the environment. In order to ensure the normal operation of equipment and manufacturing, and to ensure the assembly quality of the products, the following requirements are imposed on the production environment of Pcba.
(1) The production workshop should be kept clean, free from dust and corrosive gases, and have certain requirements for the production workshop of the circuit board. The air cleanliness is 100000 (BGJ73-84).
(2) The environment temperature is preferably (25 ± 2) °C, generally 17 ° C ~ 28 ° CC, the limit temperature is 15 ° C ~ 35 ° C.
(3) The relative humidity in the air is too high, which may lead to defects such as tin beads and solder splash after soldering; if the relative humidity is too low, the solvent in the flux will volatilize, and static electricity is easily generated, causing a series of defects. Therefore, the relative humidity should be controlled within the range of 45% to 70%. In view of the above requirements for the production environment of Pcb, the general production workshop should be equipped with air conditioning, and a certain amount of fresh air is required to ensure human health.
The above is the requirements of the Pcb manufacturing environment. For more information, please pay attention to this website: www.cnfastpcb.com