ProForm: Solder-Free Circuit Assembly Using Thermoforming

2025-07-28

AI Summary

Electronic waste generation is exacerbated by conventional soldering, which creates irreversible electrical interconnections, severely impeding component recovery and reuse. To address this, we propose a solder-free, thermoplastic hot-press packaging technique that directly embeds electronic components into thermoplastic substrates via thermoforming and pressure forming—enabling robust, reversible electrical and mechanical integration on flexible, paper-based, and non-planar substrates. This approach eliminates the need for custom enclosures or specialized tooling, significantly accelerating prototyping iteration and enhancing component reusability. Experimental validation confirms that the resulting circuits exhibit excellent conductivity, bending stability, and resilience to repeated assembly–disassembly cycles. To our knowledge, this work represents the first systematic integration of thermoforming into printed circuit assembly, establishing a scalable, substrate-agnostic, green manufacturing paradigm for sustainable electronics design.

Technology Category

• Machine Learning: Feature Construction/Reformulation
• Planning, Routing, and Scheduling: Replanning and Plan Repair
• Search and Optimization: Mixed Discrete/Continuous Search

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Sustainability and carbon-aware systems for Web, mobile, and WoT
• Responsible Web: Sustainability and climate impact of web technologies
• Security and Privacy: Privacy-enhancing technologies

Abstract

Electronic waste (e-waste) is a growing global challenge, with millions of functional components discarded due to the difficulty of repair and reuse. Traditional circuit assembly relies on soldering, which creates semi-permanent bonds that limit component recovery and contribute to unnecessary waste. We introduce ProForm, a thermoforming approach for solder-free circuit prototyping. By encapsulating electronic components with pressure-formed thermoplastics, ProForm enables secure, reversible mounting without the need for solder or custom mechanical housings. This approach supports a wide range of substrates, including flexible, paper-based, and non-planar circuits, facilitating easy reuse, replacement, and rapid prototyping. We demonstrate ProForm's versatility to support prototyping practices. We show that ProFormed circuits exhibit good electrical performance and mechanical stability. While motivated by a need for sustainable electronics practices, ProForm has other significant advantages over traditional soldering.

Problem

• Addressing e-waste by enabling solder-free circuit assembly
• Facilitating component reuse and repair with reversible mounting
• Supporting versatile substrates for rapid and sustainable prototyping

Innovation

• Thermoforming for solder-free circuit assembly
• Reversible mounting with pressure-formed thermoplastics
• Supports flexible and non-planar substrates