SMD machines assembling a PCB in a modern SMT production line

Stencil Printer for Precise and Reliable Solder Paste Printing in SMT Assembly

Stencil Printer for Precise and Reliable Solder Paste Printing in SMT Assembly

Approximately 70% of all defects in SMT production originate from the stencil printing process. Our stencil printers are engineered to secure this critical step: precise and fully automated, Industry 4.0 ready, equipped with SPI closed-loop systems, and flexibly configurable. Whether for large PCBs with the
P-Primo, ultra-short cycle times with the G-Tera, the highly flexible GL-Star, or the budget-friendly model G-Star – we provide the right solution for every production line.
Discover now: SMT printers tailored to every requirement in your SMT assembly line!

Our Stencil Printers at a Glance:

SMT Screen Printer G-Tera

SMT Screen Printer
G-Tera

GKG G-Tera stencil printer for high-speed and high-precision solder paste printing in SMT production

The G-Tera solder paste printer is engineered for maximum precision and speed, making it the perfect solution for the increasing demands of modern SMT lines. It combines all the features of the GL-Star, including digital CCD camera and vacuum stencil locking, with advanced automation such as a linear-motor-driven independent cleaning system and
AGV-supported stencil change. Delivering stable, high-speed solder paste printing, this SMT screen printer sets new benchmarks in efficiency and process reliability – ideal for high-output lines with a strong focus on Industry 4.0.

Key Advantages:

  • Highest printing speed: Core cycle time of only 5.2 seconds for maximum throughput.

  • Flexible dispensing: Compatible with solder paste and glue dispensing for complex assemblies.

  • Sustainable, paperless cleaning: Eco-friendly stencil cleaning with vacuum suction ensures consistent results.

  • Industry 4.0 ready: Seamless MES integration for full traceability and smart production processes.

GKG G-Tera stencil printer for high-speed and high-precision solder paste printing in SMT production

SMT Screen Printer GL-Star

SMT Screen Printer
GL-Star

GL-Star solder paste printer with automatic squeegee control and SPI integration

The GL-Star is a highly flexible, fully automatic stencil printer engineered for the demands of modern SMT lines. Equipped with advanced functions such as automatic stencil alignment, SPI closed-loop connection, precision PCB clamping, and automatic paste dispensing, this model increases process reliability and efficiency in your SMT production. An ideal choice for manufacturers prioritizing quality, reliability, and long-term automation security.

Key Advantages:

  • Digital CCD camera: Accurate stencil-to-PCB alignment with integrated 2D solder paste inspection.

  • Cost efficiency: Outstanding price-performance ratio for your SMT production.

  • Vacuum stencil locking system: Secure fixation eliminates vibration for accurate print results.

  • Industry 4.0 ready: Seamless MES integration for full traceability and smart production processes.

SMT Screen Printer P-Primo

SMT Screen Printer
P-Primo

P-Primo large-format stencil printer for oversized PCBs in SMT assembly

The P-Primo automatic stencil printer is a powerful solder paste printing system designed for extra-large PCBs in SMT production. With integrated 2D paste inspection and automatic PCB thickness adjustment, this model delivers top precision and flexibility – ideal for large, complex assemblies in “XL format”.

Key Advantages:

  • Flexibility: Supports PCB sizes from 100 mm x 65 mm
    up to 850 mm x 610 mm.

  • Digital CCD camera: Accurate stencil-to-PCB alignment with integrated 2D solder paste inspection.

  • SPI closed-loop system: Automatic printing correction based on SPI feedback.

  • PCB clamping: Combination of retractable top clamp and motorized side clamp ensures precise positioning and stable hold.

P-Primo large-format stencil printer for oversized PCBs in SMT assembly

SMT Screen Printer G-Star

SMT Screen Printer
G-Star

G-Star SMT stencil printer for precise solder paste printing, with integrated touchscreen and modern control panel

The G-Star SMT printer is a high-precision and cost-effective solution for modern SMT production. With an SPI closed-loop system, automatic solder paste dispensing, and short cycle times, this solder paste printer guarantees consistently high print quality while minimizing operator workload. Industry 4.0 compatibility and precise solder paste deposition make the G-Star the ideal entry-level model for efficient and reliable SMT assembly.

Key Advantages:

  • Digital CCD camera: Accurate stencil-to-PCB alignment with integrated 2D solder paste inspection.

  • Cost efficiency: Outstanding price-performance ratio for your SMT production.

  • PCB clamping: Combination of retractable top clamp and motorized side clamp ensures precise positioning and stable hold.

  • Industry 4.0 ready: Seamless MES integration for full traceability and smart production processes.

Solder Paste Printing with an SMT Screen Printer – Step by Step:

Inside view of a stencil printer during solder paste squeegee process

  • Clamping the stencil: In the SMT printer, a stainless-steel stencil with a thickness between 80 and 250 µm is mounted. Its precisely laser-cut openings (apertures) define exactly where solder paste is deposited onto the SMT pads of the PCB.

  • Aligning the PCB: The PCB and stencil are aligned to each other using fiducial marks. The integrated vision system of the automatic stencil printer ensures highly accurate alignment – enabling repeatable and reliable solder paste printing results.

  • Applying solder paste: A squeegee spreads solder paste evenly across the stencil. The apertures are filled precisely with paste, which is then accurately transferred onto the SMT pads of the PCB.

  • Stencil cleaning: To avoid residue and guarantee consistent printing quality, the system performs automated and regular stencil cleaning cycles.

  • Inspection and transfer: The printed solder paste can be inspected directly inside the SMT stencil printer with 2D SPI or controlled externally with a dedicated SPI system. Afterwards, the PCB – ready for component placement – is automatically transported to the next process stage.

Inside view of a stencil printer during solder paste squeegee process

Reliable Printing – How Our Solder Paste Printers Prevent Defects:

Stencil printer technology preventing SMT printing defects such as solder bridges and insufficient paste deposits

  • Incorrect stencil alignment: Misalignment between PCB and stencil causes offset, leading to solder paste being deposited beside the pads – which later results in misplaced components.
    Our solution: Our solder paste printing systems feature
    a high-resolution digital CCD camera that aligns the PCB and stencil precisely before every print. This ensures reliable, repeatable stencil printing for SMT production.

  • Solder bridging: Excess solder paste on adjacent pads can cause shorts.
    Our solution: Integrated 2D inspection in the solder paste printer detects print defects immediately. With advanced vision technology, bridging is identified and prevented early – significantly reducing scrap and rework.

  • Incomplete solder paste deposits: Blocked apertures result in unprinted pads, leaving missing solder joints.
    Our solution: The automatic stencil cleaning system keeps apertures clean and open. This ensures that solder paste is applied uniformly and completely – guaranteeing stable connections on every SMT pad.

  • Insufficient solder paste volume: Too little paste leads to cold solder joints or weak connections.
    Our solution: Our SMT printers continuously monitor the solder paste rolling diameter. If it drops below the set value, fresh paste is automatically dispensed. This maintains consistently high print quality – without manual intervention.

  • Lack of process feedback: Without SPI (Solder Paste Inspection) feedback, print defects may go unnoticed – with serious consequences during placement and reflow.
    Our solution: The SPI closed-loop connection in our solder paste printing systems uses SPI data to automatically adjust the print process. Errors are not only detected but corrected
    in the next cycle – ensuring consistently high quality in SMT production.

Stencil printer technology preventing SMT printing defects such as solder bridges and insufficient paste deposits

Your SMT Production in Focus: Our Turnkey Solutions

Your SMT production deserves the optimal combination of efficiency, precision, and quality. Our turnkey SMT lines provide fully integrated solutions with perfectly synchronized machines and cutting-edge technologies to ensure maximum performance and process reliability.

  • SMT printers: Accurate solder paste deposition for highly reliable solder joints.

  • Pick and Place Machines: Component placement with maximum precision and speed.

  • Reflow ovens: Outstanding soldering quality with vacuum, nitrogen, or convection technology – supported by advanced temperature profiling.

  • SPI/AOI systems: Automated inspection for defect-free results and continuous process control.

  • Handling Systems: Seamless material flow to ensure efficient SMT line operation.

  • Industry 4.0: Automation and traceability software, including closed-loop feedback between critical process steps to ensure consistent quality and transparency.

Discover more about our complete SMT line solutions and get expert advice from our team to find the perfect setup for your production needs.

Did You Know? We also have a dedicated webshop where you can find in-depth information, complete technical specifications
and a wide range of additional equipment for your production line. Get expert advice or place your order quickly and securely.

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