P+R keys are plastic and silicone rubber keys assembled together by dispensing, P in the English Plastic (plastic) abbreviation, R in the English Rubber (silicone rubber) abbreviation. Now is widely used in a variety of electronic products, the more common are learning machine keys, calculator keys, keyboard, POS card machine keys, cell phone keys, etc., are p + r keys.

p+r keys specific production links.
　　First, the preparation process link, as long as the silicone material products need to prepare the material before injection molding;
　　Second, injection molding link, this is all silicone products need to go through the link, p + r keys are no exception, is the plastic raw materials into the injection molding machine, through the injection molding machine can be made into the product we want the size and specifications of the plastic key caps;
　　Third, the silicone lining key molding link, will be prepared first silicone material in the silicone vacuum molding machine in the mold of high pressure low temperature vulcanization of silicone lining key we want size specifications
　　Four, screen printing process, we have spoken in detail before, this is the silicone key products generally need to carry out the process, is to let the key products appear on the surface of the characters and patterns we want;
　　Five, spraying process, which is also a silicone key products must use the process, is the key product surface sprayed with a layer of oil color color oil, with matte, enhance the feel of the material, surface aesthetics and other functions;
　　Sixth, the laser engraving process, the
　　Seven, punching and cutting process links, punching and cutting process is mainly used to punch out the shape and size of the plastic key caps required for assembly;
　　Eight, the demolition link, mainly is the p + r key molding after the need to demolition around the edge;
　　Nine, assembly link, there are four links as follows.
　　1, the silicone lined keys brush treatment agent, the role of silicone lined keys and adhesives have stronger adhesion;
　　2, the plastic key caps, silicone lined keys in the correct order and direction of discharge in the assembly jig;
　　3, in the silicone lined keys dotted with the appropriate amount of adhesive;
　　4、Assemble the plastic keycaps and silicone lined keys together by pressing the machine.
　　10. Baking link, put the p+r keys into the baking machine for 20 minutes to let the keys cured completely, including screen printing ink and adhesive.
　　Eleven, quality inspection, inspection of the assembled p+r keys, the production process of product scratches, stains, bad screen printing, bad laser engraving, assembly of off-position, etc., to pick out.