Product Overview
This is a 1×1 cavity precision injection mold custom-engineered for manufacturing high-quality medical shell components using TPU 90A material. Designed with a large side gate runner system, the mold uses 738H pre-hardened mold steel for both cavity and core, featuring a polished cavity surface and VDI-24 textured core. Optimized for TPU’s flexibility and medical-grade hygiene requirements, this mold ensures consistent, defect-free production of durable, biocompatible medical housings.
Mold Technical Specifications
| Parameter | Specification |
| Mold Configuration | 1×1 single-cavity design |
| Runner System | Large side gate injection for balanced, pressure-stable filling |
| Molding Material | TPU 90A (thermoplastic polyurethane, Shore hardness 90A) |
| Cavity Steel | 738H mold steel, pre-hardened, with high-gloss polishing |
| Core Steel | 738H mold steel, pre-hardened, finished with VDI-24 standard texture |
| Hardness | HRC 32–36 (standard 738H pre-hardened state) |
| Application | Medical shell/housing components requiring flexibility, durability, and hygiene |
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Key Design & Performance Advantages
1. 1×1 Single-Cavity Design for Precision Medical Parts
The 1×1 cavity configuration eliminates flow imbalance, ensuring uniform material distribution and dimensional accuracy for complex medical shell geometries. This setup allows for tight process control, critical for parts that require consistent fit, function, and compliance with medical standards.
2. Large Side Gate Runner System for TPU Compatibility
TPU 90A is a flexible, high-viscosity material that benefits from large, unrestricted flow paths:
High flow efficiency: The large side gate reduces shear stress, preventing material degradation or flow marks common with narrow gates.
Pressure stability: Ensures complete filling of intricate shell features, even in thicker or ribbed sections.
Reduced cycle time: Balanced flow minimizes hold pressure requirements, speeding up production without compromising quality.
3. 738H Mold Steel: Durability & Stability for Medical Production
738H is a premium pre-hardened mold steel ideal for high-volume medical and consumer applications:
High toughness & wear resistance: Resists fatigue and abrasion from repetitive TPU injection cycles, extending mold service life.
Excellent polishability: The cavity can achieve a mirror-like finish, critical for smooth, easy-to-clean medical shell surfaces.
Uniform hardness: HRC 32–36 provides consistent dimensional stability, preventing warpage or deformation during production.
4. Dual Surface Finish: Polished Cavity + VDI-24 Core
This dual finish balances hygiene, aesthetics, and functionality:
Polished cavity: Delivers a smooth, glossy outer surface for the medical shell, reducing contamination risks and simplifying cleaning/sterilization processes.
VDI-24 textured core: Adds controlled, fine texture to internal surfaces, reducing ejection friction, preventing sticking, and hiding minor molding imperfections.
5. TPU 90A Material Optimization for Medical Use
TPU 90A offers excellent flexibility, impact resistance, and biocompatibility—ideal for medical shell components like instrument housings, device grips, or protective casings. The mold is optimized to handle TPU’s unique properties:
Prevents sink marks or warpage common with flexible polymers.
Maintains consistent wall thickness for structural integrity.
Minimizes residual stress to preserve the material’s flexibility and durability.
Application & Quality Assurance
This mold is purpose-built for medical-grade plastic shell production, where hygiene, precision, and reliability are non-negotiable. The combination of 738H steel, optimized side gate design, and dual surface finishes ensures:
Compliance with medical manufacturing standards (ISO 13485-ready process control).
Consistent part quality, even in high-volume production runs.
Low maintenance requirements, thanks to the steel’s corrosion resistance and durable surface treatments.
Conclusion
The 1×1 cavity TPU 90A large side gate injection mold is a high-performance solution for manufacturing premium medical shell components. With 738H steel construction, polished cavity/VDI-24 core finishes, and TPU-specific flow optimization, it delivers the precision, durability, and hygiene compliance required for medical-grade plastics.
