GKG GT++

A screen printer, also known as a solder paste printer or stencil printer, is a machine used in surface-mount technology (SMT) assembly lines to deposit solder paste onto the pads of printed circuit boards (PCBs) through a metal stencil. The stencil contains apertures that align with the pad locations, and a squeegee forces the paste through the openings.

The GKG GT++ employs a single digital CCD camera for both upward and downward vision, enabling simultaneous fiducial recognition. The lighting system includes a coaxial light source and a circular light source, both with adjustable brightness. The print head uses two independent motorized squeegees, with adjustable speed (10–200 mm/sec) and closed-loop pressure control (0.5–20 kg). The squeegee angle can be set to 45°, 55°, or 60° depending on the application. The machine supports single or double squeegee printing modes.^[1][3][4][2]

The stencil cleaning system uses a back-and-forth spray method with three programmable modes: dry wiping, wet wiping, and vacuum suction. The cleaning stroke is automatically calculated based on the PCB dimensions. The machine also features a patented over-the-top clamping system and a self-retractable upward pressing plate to handle warped boards.^[1][3][4][2]

Screen printers are used in the assembly of virtually all electronic products that employ surface-mount components. Typical applications include consumer electronics (smartphones, tablets, laptops), automotive electronics, medical devices, telecommunications equipment, and industrial controls. The process is also applicable to special materials such as flux, silver paste, and adhesives.