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Surface Finishing · Painting · Screen Printing · Pad Printing · Laser Marking
Plastic Surface Finishing: Robotic Painting, Pad and Screen Printing, UV Printing and Laser Marking
Hongqing finishes molded parts on the same site where they are molded: 6 robotic painting lines, 30+ pad printers (including a six-color rotary pad printer) and 7+ automatic screen printers, plus UV printing, laser marking, conductive coating and heat-staked inserts. Plating is not done in-house; when needed it is outsourced and disclosed at the quotation stage.
We'll sign an NDA before you send drawings · Or email info@dghongqing.com
Last updated: October 2026
6 robotic painting lines
30+ pad printers
7+ screen printers
Outsourced plating disclosed upfront
Processes at a glance
Finishing and secondary operations
These figures match our factory page, and you can check each one during a factory visit or video audit.
Robotic spray painting
6 lines for matte, gloss and soft-touch paint
Pad printing
30+ pad printers including a six-color rotary machine; for curved surfaces and small areas
Screen printing
7+ automatic screen printers; for flat and regular curved surfaces
UV printing
Multi-color graphics and small-batch custom designs
Laser marking
Wear-resistant logos, text, serial numbers and functional markings
Conductive coating
EMI shielding and anti-static coating
Heat-staked inserts
Threaded inserts heat-staked into plastic parts, ready for assembly
Plating
Not done in-house; outsourced when needed and disclosed at the quotation stage
Laser marking equipment, photographed at our Qiaotou, Dongguan plant
Choosing a finish
Which surface finish suits your part
One part often combines several processes, for example painting, then a screen-printed logo, then a laser-marked serial number; our engineers recommend the combination in the quote based on your cosmetic requirements and volume.
01
Full-surface color
Robotic spray painting
For full-color housings and panels in matte, gloss or soft-touch paint; add logos with screen or pad printing.
02
Flat-surface printing
Screen printing
For logos, text and scales on flat or regular curved surfaces, with crisp, consistent results; switch to pad printing for strong curves or very small areas.
03
Curved-surface printing
Pad printing
For curved, recessed or raised surfaces and small areas such as buttons, with multi-color registration; large single-color graphics suit screen printing better.
04
Multi-color graphics
UV printing
For multi-color gradients and small custom batches with no screens needed; screen printing costs less for high-volume single-color marks.
05
Permanent marking
Laser marking
For wear-proof logos, serial numbers and QR codes that never peel; use printing when you need color.
06
Functional coating
Conductive coating
EMI shielding and anti-static coating for housings, common on electronics and telecom enclosures.
Finishing capability
4 key numbers for surface finishing
You can see the equipment and records behind every number during a factory visit or video audit.
6 lines
Robotic spray painting lines
30+
Pad printers, including a six-color rotary machine
7+
Automatic screen printers
4
Marking methods: screen printing, pad printing, UV printing and laser marking
Color and appearance
How color and appearance are approved and kept consistent
Every finish is signed off on a sample before production, and every batch is compared with that sample.
01
Sampling
Samples matched to your color reference
We make samples to your color plaque, physical sample or finish requirements; once you sign off, that sample is the production standard.
02
First article
First article checked every batch
Each batch starts with a first article compared with the signed-off sample for color, gloss, print position and sharpness before production continues.
03
Shipping
Outgoing inspection to standard
Appearance is inspected before shipment per GB/T 2828.1 (ISO 2859-1) AQL or your standard; if you have a color tolerance, it goes into the inspection standard before ordering.
Factory photos
Inside our finishing shop
These photos were taken at Hongqing's factory in Qiaotou, Dongguan; you will see the same workshops and equipment during a factory visit or video audit.
Robotic spray booths
Robotic spraying gives an even coat and batch-to-batch consistency.
UV printer
Multi-color graphics and small-batch custom designs.
Heat-staking machine
Heat-stakes threaded inserts into plastic parts, ready for assembly.
Before and after finishing
Molding, finishing, assembly and QC on one site
Molded parts never go out to separate painting or printing shops, and cosmetic issues can be traced to the responsible step inside our plant.
Injection Molding
90+ presses from 80T to 1300T; mold trials and production both run in our own factory.
Explore injection molding →
Product Assembly
5 assembly lines in an enclosed workshop with an air shower: heat-staked inserts, insert assembly, complete product assembly, packing and shipping.
Explore assembly →
Quality Control
A 20-person QC team inspecting at four gates: incoming, first article, in-process and outgoing.
Explore quality control →
Injection Mold Manufacturing
Our tool shop designs and machines molds to ±0.01 mm, up to 1.5 m, and trials them on our own presses.
Explore mold making →
Screen printing or pad printing: which should I choose, and does Hongqing do both?
Hongqing does both, with 7+ automatic screen printers and 30+ pad printers, including a six-color rotary pad printer. The surface decides: logos, text and scales on flat or regular curved surfaces are screen printed for crisp, consistent results, while curved, recessed or raised surfaces, buttons and small areas are pad printed, because the silicone pad conforms to the curve and can register several colors. Many parts use both, such as a screen-printed front panel with pad-printed side buttons. We set the method in the quote based on your drawing and cosmetic requirements, and send samples for your sign-off first.
What paint finishes are available, and how is color approved?
Hongqing runs 6 robotic painting lines for matte, gloss and soft-touch finishes, and robotic spraying gives a more even coat and better batch-to-batch consistency. We match color to your plaque, sample or finish requirements and make samples; once you sign off, that sample is the production standard. Each batch starts with a first article compared against it for color, gloss and appearance before full painting. Logos or text are usually added after painting by screen printing, pad printing or laser marking. If you have a color tolerance, tell us before ordering and we will write it into the inspection standard.
How does Hongqing handle electronic housings that need EMI shielding?
Hongqing applies conductive coating in-house, on the same site as its 6 robotic painting lines, for EMI shielding and anti-static protection on electronic housings such as telecom enclosures, controller housings and other products with circuit boards. The conductive coat usually goes on the inside of the housing while the cosmetic surface is painted or left in its molded color, and both steps happen in our plant. Shielded areas, coating boundaries and assembly contact points are confirmed with you during DFM review and sampling; certification testing of shielding performance, such as EMC, must be done by an accredited third-party lab.
Laser marking or printing: which lasts longer?
Hongqing does all 4 marking methods in-house: laser marking, screen printing, pad printing and UV printing. Laser marking is the most durable, because the laser forms the mark in the part surface itself, so it cannot peel or rub off; it suits logos, serial numbers, QR codes and frequently touched buttons. Printing offers full color for logos and graphics, and its durability depends on the ink and surface. Laser marking a painted part reveals the base color to form the symbol, which is common for backlit buttons. We recommend the method in the quote based on use conditions, cosmetic requirements and volume.
Send us what you have. We'll map out the route to mass production.
Wherever you are in development, we'll propose the right manufacturing plan, from early design review through tooling and molding to finishing, assembly and shipping, and move your project step by step to mass production.
Helpful to include: sketches, drawings or 3D files, annual volume and target market.
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