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Surface Finishing & Secondary Operations
Equipped with post-processing capabilities such as robotic spray coating lines, screen printing, pad printing, UV printing, laser marking, conductive paint spraying, and hot-press nut assembly, we provide support for enhancing the appearance of plastic products, applying functional coatings, adding brand logos, and performing pre-assembly treatment.
What is plastic surface treatment?
Plastic surface treatment is a critical process for enhancing a product’s visual appeal, functional performance, and brand recognition. Through methods such as spray painting, screen printing, pad printing, UV printing, laser marking, and conductive paint spraying, plastic products can achieve improved visual appeal, wear resistance, functional coatings, and branding.
For consumer electronics, automotive parts, home appliance housings, industrial products, and 3C products, surface treatment not only affects the product’s appearance but also influences the user experience, durability, and market competitiveness. Hongqing possesses capabilities in post-injection molding surface treatment and finishing, enabling us to provide customers with integrated services ranging from plastic part molding to surface finishing, functional processing, and pre-assembly preparation.
Hongqing Surface Treatment and Post-Processing Services
Hongqing offers a variety of surface treatment and post-processing techniques tailored to the visual texture, patterns and logos, functional coatings, and assembly requirements of plastic products. We can tailor appropriate treatment solutions based on the product’s material, structure, aesthetic requirements, operating environment, and the customer’s brand needs, enhancing the product’s perceived quality and market competitiveness.
Robotic Spray Painting
Hongqing is equipped with four robotic spray painting lines, capable of providing reliable spray coating services for plastic housings, structural components, consumer electronics, industrial enclosures, and home appliance parts. Robotic spray painting helps improve coating uniformity, appearance consistency, and production efficiency, making it ideal for products with high aesthetic quality requirements.
- Equipped with 4 robotic painting lines
- Improving Spray Painting Uniformity and Appearance Consistency
- Suitable for consumer electronics, home appliance enclosures, industrial enclosures, and other products
- Can achieve effects such as matte, high-gloss, and textured finishes as needed
Spraying of Conductive Paint
For plastic products requiring electromagnetic shielding, antistatic protection, or functional coatings, Hongqing offers conductive paint spraying services. This process is commonly used for electronic product housings, telecommunications equipment housings, industrial control products, and other plastic components that require shielding performance.
- Supports conductive paint spraying
- Suitable for electronic product enclosures, telecommunications equipment, and industrial enclosures
- Can enhance the product's electromagnetic shielding, anti-static, and other functional performance
- Supports functional surface coating treatments for large plastic parts
Screen Printing Services
We have 28 six-color rotary pad printing machines and two-shot/single-color pad printing machines, as well as 6 fully automatic screen printing machines. Screen printing is suitable for printing text, patterns, logos, functional markings, and operating instructions on the surfaces of plastic products. Hongqing provides consistent and crisp screen printing services tailored to product appearance requirements, color specifications, and usage environments.
- Suitable for printing logos, text, icons, and functional symbols
- Suitable for plastic parts with flat or regular surfaces
- Clear printing, suitable for mass production
- Commonly used in home appliances, electronic products, industrial control panels, and other products
Pad Printing Services
Pad printing is suitable for printing patterns and text on curved, irregular, small-area, or complex-structured surfaces. For buttons, curved housings, irregularly shaped parts, and small plastic components, pad printing offers greater flexibility in marking applications.
- Suitable for printing on curved, irregular, and small surfaces
- Can be used for products such as buttons, curved housings, and functional components
- Supports printing of logos, designs, text, and symbols
- Suitable for areas with complex structures that are difficult to screen print
UV Printing
UV printing can be used to apply colorful patterns, brand elements, decorative textures, and customized visual effects to the surfaces of plastic products. Compared to traditional printing methods, UV printing is well-suited for multicolor designs, small-batch customization, and a wider range of visual expressions.
- Supports multi-color patterns and customizable visual effects
- Suitable for plastic products such as housings, panels, and decorative parts
- Enhance product aesthetics and brand recognition
Laser Marking
Laser marking can create clear, wear-resistant, and durable text, patterns, logos, or serial numbers on the surface of plastic products. It is suitable for products that require high durability, precision, and a premium finish for their markings.
- Supports laser marking of logos, text, serial numbers, and feature identifiers
- Clear markings that are wear-resistant and do not peel off easily
- Suitable for electronic products, home appliances, industrial control components, and other products
- Can enhance product quality and brand recognition
Post-Processing of Hot-Pressed Nuts and Inserts
Hot-press nuts are a post-processing and pre-assembly treatment technique for plastic parts, suitable for plastic products that require screw fastening, structural connections, or repeated disassembly and reassembly. Hongqing offers customers post-processing services such as hot-press nuts and insert installation to enhance product assembly strength and structural reliability.
- Supports post-processing operations such as heat-staked inserts and insert installation
- Improving the Bond Strength and Assembly Reliability of Plastic Parts
- Suitable for products such as housings, structural components, brackets, and functional parts
- Can be integrated with subsequent clean assembly and finished product delivery
Integration of Surface Treatment and Injection Molding Assembly
Hongqing offers integrated capabilities in injection molding, surface treatment, post-processing, and cleanroom assembly. Once injection-molded parts are completed, they can proceed directly to spray painting, printing, laser marking, heat staking of nuts, assembly, and packaging for shipment, thereby reducing the time and quality risks associated with customers having to coordinate with multiple suppliers.
- Surface treatment and post-processing can be performed immediately after injection molding
- Reduce the costs associated with multi-vendor shipping and communication
- Improve visual consistency, delivery efficiency, and quality stability
- We offer one-stop delivery from plastic parts to finished products
Integrated Support for Surface Treatment and Assembly
After injection molding is complete, Hongqing can provide follow-up services such as spray painting, screen printing, pad printing, UV printing, laser marking, conductive paint spraying, heat staking of nuts, insert assembly, cleanroom assembly, and packaging and shipping, helping customers complete the entire process from plastic parts to finished products.
- After injection molding, processes such as spray painting, screen printing, pad printing, and UV printing can be performed.
- Supports laser marking, conductive paint spraying, and cosmetic and functional surface treatments
- We offer hot-press nuts, insert assembly, and complete machine assembly
- Reduce the number of supplier integrations and improve delivery efficiency
Frequently Asked Questions
Yes. Hongqing is equipped with two robotic spray-painting lines and offers spray-painting services for plastic housings, structural components, home appliance parts, consumer electronics, and industrial enclosures, supporting a variety of finishes such as matte, high-gloss, and textured coatings.
Yes. Hongqing offers conductive paint spraying services for plastic parts that require electromagnetic shielding, antistatic protection, or functional coatings, such as housings for electronic products, telecommunications equipment, and industrial control devices.
Yes, we can do both. Screen printing is better suited for text, logos, and patterns on flat or regular surfaces; pad printing is better suited for curved surfaces, irregularly shaped surfaces, small areas, or surfaces with complex structures. We will select the appropriate process based on the product’s shape and the printing location.
Yes. UV printing is suitable for multicolor designs, decorative effects, and small-batch customization; laser marking is suitable for logos, text, serial numbers, and functional markings. The markings are clear, wear-resistant, and durable, making them ideal for electronic products, home appliances, and industrial plastic parts.
Strictly speaking, hot-press nuts fall under post-processing and pre-assembly treatment, not traditional surface treatment. However, in actual projects, this process typically takes place after injection molding and before final assembly; therefore, it can be included on the “Surface Treatment and Post-Processing” page to help customers understand our full range of post-processing capabilities.
Yes. Hongqing has a clean assembly line that can handle heat staking of nuts, insert assembly, component assembly, complete unit assembly, inspection, packaging, and shipping after surface treatment and post-processing are completed, helping customers reduce the costs associated with coordinating with multiple suppliers.
Plastic products such as consumer electronics housings, home appliance housings, automotive parts, industrial enclosures, 3C products, control panels, buttons, decorative parts, and functional structural components can all undergo surface treatment to meet requirements for appearance, wear resistance, labeling, or functionality.
Do you need to improve your product’s visual appeal or performance?
Whether you need spray painting, screen printing, pad printing, UV printing, laser marking, conductive paint spraying, or hot-press nuts, post-processing, and final assembly, Hongqing can provide you with end-to-end support—from injection-molded parts to final product delivery—making your products more aesthetically pleasing, more reliable, and more competitive in the market.
Surface Finishing at a Glance
| Painting | 2 robotic spray painting lines |
|---|---|
| Printing | Screen printing, pad printing, UV printing |
| Marking & coatings | Laser marking, conductive (EMI shielding) coating |
| Secondary operations | Heat-staked inserts and pre-assembly processing |
| Applications | Consumer electronics, automotive parts, appliance and industrial enclosures |
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