Multi-Component LSR Overmolding Delivers Design Breakthrough for Smartwatch Brand

A manufacturer of smartwatches needed to produce a housing that combined waterproof sealing, soft‑touch buttons, and biocompatible skin contact. However, their existing multi‑part assembly that uses separate PC shells, silicone gaskets, and TPU buttons caused high defect rates, supply chain complexity, and inconsistent sealing.

Our solution used a multi‑component LSR overmoulding system with an L‑type rotary injection platform, which integrates the rigid base, silicone sealing layer, and soft‑touch buttons into a single automated cycle. The machine features a precision metering unit with tight A/B ratio control and closed‑loop injection that delivers repeatability well within wearable‑industry tolerances.

This single‑step approach reduced part count from over a dozen to one, eliminated assembly variations and achieved a higher waterproof rating. Production labour dropped significantly, and per‑unit costs decreased, while cycle times remained fast and output stable. The system's ability to handle multiple materials in one shot gave the manufacturer a simpler, more reliable production line and greater design flexibility for future products.