ISO 9001:2015 Certified
Standardized Quality Management
- +86-173 9807 5880
- quote@rallyplastic.com
Your manufacturing partner for plastic bluetooth earphone housings and charging cases. Rally Plastic supports you from rapid prototyping and precision mold tooling to high-volume plastic injection molding, delivering robust plastic components with tight tolerances for your audio devices.
Rally Plastic operates an advanced manufacturing floor featuring automated production lines, rigorous inspection labs, and CNC tooling to deliver high-precision TWS earbud components with strict global standards and zero defects.
CNC Tooling Center
Precision Inspection
Dust-Free Assembly
At Rally Plastic, you gain access to a wide range of engineering plastics, expertly selected to protect earphone's sensitive internal electronics and meet strict IP ratings.
PC
ABS
TPU/TPE
Outer charging cases, structural internal frames, and high-end transparent earbud designs.
Standard wireless earbud housings, internal support brackets, and painted/coated casings.
Waterproof sealing rings, ear tips, protective outer bumpers, and two-shot overmolding applic
Rally engineers and molds intricate internal architectures without restricting your creativity—our manufacturing adapts to your specific structural needs.
Engineered to ensure smooth lid opening with tight tolerances, preventing gaps that trap dust or cause misalignment.
Tailored internal sound cavity designs, secure microphone channels, and robust PCB mounting bosses that withstand daily drop impacts.
Complex, flash-free magnet slots for charging case lids and precise hinge mounts optimized for long-term mechanical wear.
Rally Plastic designs molds built for longevity and consistency. For large-scale projects, we develop robust multi-cavity injection mold tooling for cases mass production, ensuring identical dimensions across every single cavity. Review the table below to explore our detailed tooling specifications.
| Tooling Aspect | Specification |
|---|---|
| Mold Base | LKM or DME standard |
| Mold Core | DIN2312, NAK80, S136, H13, P20, 718 etc. |
| Mold Life | 500,000 to 1,000,000+ shots |
| Runner System | Cold Runner / Hot Runner |
| Mold Cavity | Single/Multi |
| Machining Precision | Tight tolerances ensuring zero-gap assembly |
Partner directly with an experienced Chinese manufacturer equipped for high-precision TWS earbud case tooling, expert injection molding, and seamless global support.
| Manufacturing Aspect | Capability |
|---|---|
| Plastic Molding Type | Precision Injection Molding, Insert Molding |
| Service Model | OEM |
| Place of Origin | China (Direct Manufacturer) |
| English Services | Yes |
| Years in Industry | 15+ Years of Expert Plastic Tooling & Molding |
| Injection Tolerance | High Precision up to ±0.03mm |
Standardized Quality Management
Eco-Friendly & Safe Polymers
Verified China Factory
Your IP & CAD Drawings are Safe
Certified Engineering Plastics
Upload your 2D/3D files for a fast, competitive quote. Turn your designs into reality.
Rally Plastic provides comprehensive surface finish options for your earbud plastic cases to perfectly match your brand identity, enhance the product's visual appeal.
By consolidating these post-molding processes, you can reduce logistical risks, lower handling costs, and significantly accelerate your product's time-to-market.
Achieve flawless outer aesthetics without structural compromise. This method securely joins internal components without visible adhesives, ensuring a seamless, premium finish.
Metal contacts, threaded inserts, and hinges are pre-installed during the molding cycle. This delivers superior pull-out strength and eliminates an entire step in final assembly.
Receive earbud housings with pre-integrated hinges, magnets, and counterweights. Your assembly line can immediately focus on PCB and battery integration to maximize efficiency.
Find answers about tooling ownership, production capabilities, materials, lead times, and our injection molding process.
Even micro-gaps in an earbud housing can cause air leakage, degrading bass response and Active Noise Cancellation (ANC) performance. At Rally Plastic, we maintain strict ±0.03mm tolerances and mirror-finish internal parting lines to ensure airtight acoustic chambers. By precisely molding intricate sound channels, microphone ports, and internal sealing ribs without flash or warping.
TWS charging case lids endure thousands of open-close cycles. Poorly molded hinge retainers or magnet pockets lead to wobbly lids, misaligned gaps, and structural fatigue. Rally Plastic prevents this by utilizing wear-resistant resins (like reinforced PC/ABS or POM) and incorporating high-precision slider-and-lifter mechanisms in our mold designs. This achieves zero-flash magnet slots and perfectly aligned pivot pinholes without deformation.
Cosmetic defects like sink marks and weld lines frequently occur around internal snap-fits, screw bosses, or hinge retainers due to uneven cooling. Rally Plastic's engineering team proactively eliminates these issues during the pre-production DFM and mold flow analysis stage. By optimizing wall thickness transitions, strategically placing injection gates, and utilizing precision conformal cooling channels within our tooling, we strictly control resin shrinkage—guaranteeing your final high-gloss or matte exterior surfaces emerge 100% uniform, flawless, and structurally sound.
Rally Plastic’s expertise extends beyond audio devices. We are a trusted manufacturing partner for a wide variety of consumer electronics plastic enclosures, including visual devices, computer peripherals, wearable devices.
Send us your 2D/3D files or project requirements. Our engineering team will deliver a detailed quotation with free DFM suggestions within 24 hours.
Email Address
quote@rallyplastic.com
Phone Number
+86-173 9807 5880
Office Location
Building 10, Shiyi Center, Yinzhou District, Ningbo, Zhejiang, China
Upload Your 2D/3D Files for a Fast Quote.