For over 40 years, Rainbow Ultrasonics and Rainbow Medical Engineering have been at the forefront of advanced plastic joining technologies, delivering innovative, precision-driven solutions to clients across the commercial, military, aerospace, and medical sectors.

We are a small, highly experienced, and knowledgeable team with decades of expertise in plastic welding. Over the years, we have supported a diverse range of customers – from early-stage production start-ups to manufacturers operating high-speed, high-volume 24/7 production environments, including several major medical device companies. Our reputation is built on quality, technical excellence, and a collaborative approach that begins with early testing and trial support, ensuring optimal results from concept through to full-scale production. Our capabilities span the entire product lifecycle. We provide advanced machines, bespoke tooling, technical skills, and ongoing support to take your products from prototype through to fully automated, high-speed production. We offer in-house weld trials, design development, tooling modifications, and early-stage prototype optimisation. Small- to medium-scale production on-site is also available to help move projects forward quickly and efficiently.

In addition to standard equipment, we design and build special-purpose machinery to meet specific application requirements. We are also happy to collaborate with larger automation companies to integrate our machines and tooling into seamless, high-speed automated production lines, ensuring reliability and efficiency throughout. Working with clients worldwide, we are recognised for our responsive support, practical approach, and commitment to delivering innovative, reliable solutions tailored to each customer’s unique manufacturing challenges.