Technical Guide & Solutions

Vertical Injection Molding Machines for Cable & Wire Harness Components

A complete guide to high-precision overmolding for EV charging cables, industrial sensors, and electronic connectors.

Industry Background & Overview

Modern electrical products rely heavily on robust cable and wire harness assemblies to transmit power and signals reliably. From EV charging plugs to industrial automation sensors, connections must withstand continuous bending, mechanical pull forces, moisture ingress, and harsh operating environments.

Cable Overmolding encapsulates terminals, connectors, and cable joints with protective plastic or elastomer materials. A well-designed overmold delivers essential strain relief, environmental sealing, and long-term mechanical protection.

Why Choose Vertical Injection Molding?

⚡ Gravity-Assisted Positioning

Vertical mold orientation utilizes gravity to hold flexible wires and metal terminals in place naturally, preventing insert movement during mold closure.

🔄 Ergonomic & Automation Friendly

Open-table design simplifies manual insert loading and integrates seamlessly with rotary tables, sliding tables, and robotic loading systems.

🎯 Minimal Defect Rates

Multi-stage pressure and precise temperature control protect delicate internal conductors and pins from high injection pressure damage.

Vertical vs. Horizontal Injection Molding

Feature	Vertical Machine	Horizontal Machine
Clamping Direction	Vertical clamping & injection	Horizontal clamping & injection
Insert & Cable Stability	Gravity-assisted, stable & reliable	Requires extra clamping or vacuum fixtures
Primary Applications	Cable overmolding, harness, connectors	Standard plastic housings & bulk parts
Floor Space	Compact footprint (~50% of horizontal)	Larger machine bed requirement

Common Overmolding Materials

PVC (Polyvinyl Chloride): Cost-effective with excellent electrical insulation and flame resistance. Ideal for standard power cords and plug connectors.
TPU (Thermoplastic Polyurethane): Exceptional abrasion resistance and flexibility. Preferred for EV charging cables and rugged outdoor sensors.
TPE / TPR: Soft-touch feel with outstanding strain relief properties. Widely used in consumer electronics cables (e.g., Type-C) and medical assemblies.
PA66 / PBT: High mechanical strength and heat resistance, commonly specified for automotive engine compartment connectors.

Optimize Your Cable Overmolding Process

Contact our application engineering team to evaluate your cable specifications, connector designs, and production volume requirements.

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