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Secondary Processing Services

  • Full finishing lineup: marking, printing, coating, welding & CNC machining
  • Early DFM process planning to reduce extra costs
  • Precision masking to safeguard metal insert surfaces
  • Consistent finish quality with traceable inspection records
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Insert molding plastic components with brass threaded inserts

One-stop Secondary Processing Support

At Runde Precision, we focus on manufacturing precision plastic components via injection molding, alongside integrated secondary processing solutions. To deliver a seamless full-cycle manufacturing experience, we provide comprehensive secondary processing and surface finishing, enabling one-stop solutions ranging from mold manufacturing, molding production, post-finishing to partial sub-assembly.

Core secondary operations including deflashing, CNC machining, ultrasonic welding, pad printing and silk screen printing are completed in-house. For special finishing processes such as laser marking, spray painting, vacuum metallization and electroplating, we cooperate with vetted, long-term qualified external suppliers.

With mature process coordination and unified quality standards, we deliver reliable, efficient and cost-effective post-molding finishing for your precision plastic parts.

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Partnerships with Suppliers

Mechanical Post-Processing For Your Parts

Deflashing

  • Remove flash, gate waste and residual burrs on molded plastic.
  • Achieve neat edges and consistent appearance of components.
  • Standard pre-operation for subsequent assembly & surface treatment.

Ultrasonic Welding

  • Thermoplastic bonding using high-frequency ultrasonic vibration.
  • Glue-free assembly with stable, leak-tight bonding seams.
  • Waterproof electronic enclosures, multi-piece plastic assemblies.

Heat Staking

  • Heat and pressure deform plastic studs to lock components together.
  • Firm fixation for PCB, metal inserts and thin decorative panels.
  • Consumer electronics, automotive interior plastic modules.

Degating

  • Remove gate and runner residues from injection‑molded parts.
  • Manual & semi‑automatic trimming for clean, burr‑free surface finish.
  • Suitable for automotive, household and electronic plastic components.

Polishing

  • Remove sink marks, weld lines and tool marks on plastic surfaces.
  • Achieve matte, semi-gloss or high-gloss surface finish.
  • Transparent parts and high-grade decorative casings.

Surface Treatment For your Parts

Electroplating

  • Deposits metal layer on plastic substrates.
  • Improve wear resistance, corrosion resistance and metallic luster.
  • Electronic housings, decorative plastic components.

Laser Engraving (Laser Marking)

  • Permanent marking without contact or ink.
  • Precise logos, serial numbers, QR codes and text.
  • Consumer electronics, industrial control plastic parts.

Spraying

  • Provides rich colors and diverse surface textures.
  • Matte, glossy and soft-touch coating available.
  • Home appliances, portable device outer casings.

Pad Printing

  • Adaptable to curved, irregular plastic surfaces.
  • Print fine text, small logos and indicator marks.
  • Buttons, small electronic plastic accessories.

Silk Screen (Screen Printing)

  • Thick ink layer for vivid, high-coverage graphics.
  • Suitable for flat and gently curved plastic panels.
  • Instrument panels, decorative outer covers.

Hot Stamping

  • Transfer metallic foil via heat and pressure.
  • Premium gold, silver and matte metallic effects.
  • High-end consumer product decorative branding.

Sandblasting

  • Creates uniform matte textured surface finish.
  • Covers minor surface defects of molded plastic.
  • Industrial equipment housings, decorative shells.

UV Coating

  • UV cured clear coating with fast production cycle.
  • Boost hardness, anti-scratch and gloss performance.
  • Transparent plastic parts and painted surface protection.

For more post-molding processes and custom requirements, please contact us.

Our Post-Molding Secondary Processing Case Studies

Browse finished plastic components with integrated mechanical post-processing and surface finishing. These projects demonstrate our one-stop capability from trimming, welding, polishing to painting, plating and laser marking.

The samples below feature post-injection secondary operations. For more injection molding projects, visit our Injection Molding page.

Electronic Gear‑Shift Knob Assembly

Electronic Gear‑Shift Knob Assembly

Process: Two-shot injection molding

Post-process: Spraying, Laser engraving, UV coating

Industry: Automotive Interior

Material: PC, PC+ABS blend, TPE, PP

Tolerance: ±0.05mm

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Hazard‑Warning Switch Internal Base

Hazard‑Warning Switch Internal Base

Process: Injection molding

Post-process: Spraying, Laser engraving

Industry: Automotive Interior

Material: PC, ABS

Tolerance: ±0.05mm

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Engine Housing Cover

Engine Housing Cover

Process: Injection molding

Post-process: Heat staking

Industry: Outdoor Power Equipment

Material: PA6-GF30

Tolerance: ±0.05mm

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Complete Plastic Housing Assembly

Complete Plastic Housing Assembly

Process: Injection molding

Post-process: Degating, Silk screen printing

Industry: Outdoor Power Equipment

Material: PP-T20

Tolerance: ±0.05mm

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Gaming Console Exterior Housing

Gaming Console Exterior Housing

Process: Injection molding

Post-process: Spraying

Industry: Consumer Electronics

Material: PC+ABS blend

Tolerance: ±0.05mm

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Combination Steering Column Switch

Combination Steering Column Switch

Process: Injection molding

Post-process: Pad printing

Industry: Automotive Interior

Material: PA66-GF30, ABS

Tolerance: ±0.05mm

View Full Case Study →