In-mold injection molding process for PCBA soft material

An in-mold injection molding process for a Printed Circuit Board Assembly (PCBA) soft material, comprising the following steps:

• Step (1) preheating a Polyethylene Terephthalate (PET) thin film:
• baking the PET thin film in a baking oven for 3 to 5 min at 60 to 120° C.;
• Step (2) printing patterns:
• placing the preheated PET thin film on a printer for printing patterns, wherein the PET thin film needs to be baked and dried after being printed, the baking temperature is 80 to 110° C., and the time is 0.5 to 1.5 h;
• Step (3) preparing a diaphragm A:
• cutting a required shape to obtain the diaphragm A by using a mold;
• Step (4) laminating a diaphragm on a Flexible Printed Circuit (FPC) board:
• scraping an Ultraviolet (UV) adhesive on a printing surface of the PET thin film printed in step (2) and laminating the printed PET thin film with the FPC board, then performing UV light curing drying, and combining to manufacture an FPC board laminated diaphragm;
• Step (5) scraping printing ink:
• scraping a layer of printing oil on an FPC board side in the prepared FPC board laminated diaphragm prepared in step (4);
• Step (6) scraping an adhesive:
• scraping a layer of adhesive on a printing ink side in step (5), and placing the prepared FPC board laminated diaphragm in the baking oven for curing, wherein the temperature is 80 to 120° C., and the time is 0.5 to 1.5 h;
• Step (7) preparing an inner diaphragm B:
• after step (6) is completed, cutting the FPC board laminated diaphragm scraped with the adhesive into a required shape by using a mold, so as to prepare the inner diaphragm B;
• and
• Step (8) placing the prepared diaphragm A and the FPC board laminated diaphragm in a mold cavity of an injection mold, preheating the injection mold to 30 to 70° C., and injecting Thermoplastic Polyurethane (TPU) resin through an injection hole, so that the diaphragm A is on an outer side of a product mobile phone protective shell, and the FPC board laminated diaphragm is on an inner side of the product mobile phone protective shell.