• +86-755-23012705
  • Building 3, Jinfeng Industrial Park, Fuyong Street, Baoan District, Shenzhen ,China
  • [email protected]
logo
  • Home
  • About Us
    • Flexible PCB Expertise
    • Our Certifications
    • Our Facility
    • Quality Assurance
  • PCB Fabrication
    • Flexible PCB
    • Rigid Flex PCB
    • Rigid PCB
    • ELIC HDI PCB
    • RF PCB
    • Medical PCB
    • Automotive PCB
    • IoT & IIoT PCB
    • Industrial Control PCB
    • Telecommunication PCB
    • Consumer Electronics PCB
  • PCB Assembly
    • Turn Key PCB Assembly
    • Consigned PCB Assembly
    • Components Sourcing
  • Capabilities
    • PCB Fab Capability
    • ATE PCB Fabrication
    • PCB Technology Roadmap
    • PCB Assembly Services
    • PCB Design Support
  • Contact
  • Resources
    • PCB Blog
    • PCB Glossary
  • Home
  • About Us
    • Flexible PCB Expertise
    • Our Certifications
    • Our Facility
    • Quality Assurance
  • PCB Fabrication
    • Flexible PCB
    • Rigid Flex PCB
    • Rigid PCB
    • ELIC HDI PCB
    • RF PCB
    • Medical PCB
    • Automotive PCB
    • IoT & IIoT PCB
    • Industrial Control PCB
    • Telecommunication PCB
    • Consumer Electronics PCB
  • PCB Assembly
    • Turn Key PCB Assembly
    • Consigned PCB Assembly
    • Components Sourcing
  • Capabilities
    • PCB Fab Capability
    • ATE PCB Fabrication
    • PCB Technology Roadmap
    • PCB Assembly Services
    • PCB Design Support
  • Contact
  • Resources
    • PCB Blog
    • PCB Glossary
Get Quote

Solder Mask Process in the PCB Board Production Process: Exposure (2)

In addition, it should be noted that sometimes the imposition base will not overlap with the printed circuit board graphics. Usually, the imposition base is cut along the edge of the imposition, and then single-piece alignment is performed, and the entire printed board is aligned and exposed. The above problems are the ones that should be paid attention to before the formal exposure of selenium solder mask.

 

Then, operate solar resistance soldering, and check whether the printed board is sucked and covered by the vacuum box before exposure. The pressure of the vacuum suction cover should be sufficient and no air is present. If the air is exposed, the ultraviolet light will be irradiated into the pattern along the side of the board, causing the shading part to be exposed, and the development will not be off. Sometimes, single-sided exposure is encountered. In this case, use a black cloth to separate the side with no patterns on one side from the ultraviolet light emitted by the exposure lamp. If the black cloth is not used, the ultraviolet light will pass through the side without patterns and be transmitted into the pad to make the hole in the pad hole. The solder resist cannot be developed after exposure.

 

When exposing printed boards with inconsistent patterns on both sides, first screen-print one side of the solder mask, then perform single-sided exposure, and after development, screen-print the other side of the solder mask. Because if both sides are screen-printed and exposed at the same time, one side has more complex patterns and needs more shading parts, while the other side needs less shading, so that the ultraviolet light is transmitted through one side to the other side, and the more shading side passes through the ultraviolet light. Irradiation, the image will not drop during development, which will cause rework or scrap.

 

During the exposure process, it is also encountered that the printed board after screen printing is not dried during curing. In this case, the solder resist will stick to the photographic plate during alignment, and the printed board will also need to be reworked, so if it is found that it does not dry, especially if most of the printed boards are not dried, they must be re-dried in the oven. These situations are easy to appear in the process of exposure, so it is necessary to check carefully, find out in time, and solve it in time.

Share

Related posts

dispensing in PCB
2025-02-07

Multilayer PCB Assembly and HDI PCB Manufacturing for High-Tech Solutions


Read more
smt product line
2025-02-06

Streamline Your PCB Production with XPCB’s Turnkey PCBA Services


Read more
2025-02-05

Comprehensive Turnkey PCBA Services: From BOM to SMT Assembly


Read more
amazon
amphenol-logo
halliburton
intel logo
samtec logo
sanmina logo

Company Info

XPCB Limited is a premium PCB & PCBA manufacturer based in China.

We specialize in multilayer flexible circuits, rigid-flex PCB, HDI PCB, and Rogers PCB.

Quick-turn PCB prototyping is our specialty.  Demanding project is our advantage.

Head Office

XPCB Limited
Address :
Building 3, JinFeng Industry Area,  Fuyong Town, Baoan District, Shenzhen, Guangdong, 518103, China.

Tel : +86-136-3163-3671
Fax : +86-755-2301 2705
Email : [email protected]

Quick Links

  • Flexible PCB
  • Rigid Flex PCB
  • ELIC HDI PCB
  • RF PCB
  • PCB Capability
  • PCBA Capabiility
  • About Us

PCB Blog

Multilayer PCB Assembly and HDI PCB Manufacturing for High-Tech Solutions

Read More »

Streamline Your PCB Production with XPCB’s Turnkey PCBA Services

Read More »

Comprehensive Turnkey PCBA Services: From BOM to SMT Assembly

Read More »

© 2024 - XPCB Limited All Right Reserve