SMT Stencil Frame Assembly with Pliable Binding Insert
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Solution Overview
Problem
Conventional framed SMT stencils face premature failure due to brittle epoxy, making it difficult and costly to recycle or reuse the frames, leading to environmental issues and high disposal costs.
Innovation Solution
A frame assembly with pliable binding inserts that secure a mesh substrate without adhesives, allowing for easy removal and reuse by melting protrusions into the substrate, enabling tension retention without epoxy, facilitating recycling and reducing disposal costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy is used to attach the mesh substrate to the frame, then the substrate is securely held, but the epoxy becomes brittle over time leading to premature failure and difficulty in recycling
Solution Approach 1:
The patent removes the epoxy adhesive from the attachment system entirely. Instead of using chemical adhesives that become brittle, the invention uses a mechanical interlocking system where the mesh substrate is physically interlocked with the frame through specially designed engagement features, eliminating the reliability issue associated with epoxy degradation.
Solution Approach 2:
The patent introduces an intermediary mechanical engagement structure between the mesh substrate and the frame. This intermediary system consists of engagement features on both the substrate and frame that physically interlock, providing a reliable attachment mechanism that does not degrade over time like chemical adhesives.
2Adaptability or versatility
If epoxy is used to secure the mesh substrate, then the frame can be reused, but removing the epoxy is difficult, time-consuming, and destructive
Solution Approach 1:
The patent segments the attachment system into separable mechanical components. The mesh substrate and frame are divided into parts with complementary engagement features that can be easily separated. This segmentation allows the substrate to be removed from the frame without destructive processes, making the frame reusable and simplifying the manufacturing cycle.
Solution Approach 2:
Instead of using a permanent chemical bond that requires destructive removal, the patent inverts the approach by using a reversible mechanical bond. The engagement features are designed to easily disengage, transforming the removal process from a difficult, destructive operation into a simple, non-destructive action that preserves both the frame and substrate for reuse.
3Reliability
If conventional framed stencils are used with epoxy, then the stencil functions properly, but the frames must be discarded after each use increasing costs and environmental impact
Solution Approach 1:
The patent implements a recovery system where the mesh substrate is designed to be easily removed and replaced on the same frame. The mechanical engagement features allow the substrate to be detached after use and a new substrate to be attached to the reused frame, recovering the frame asset and eliminating the need for disposal. This creates a sustainable cycle where only the consumable substrate is discarded, not the expensive frame.
Data Source
AI summary
A framed stencil for surface mount technology (SMT) is provided. The frame assembly includes a frame member and a binding insert. The frame member includes an inner perimeter portion and an outer perimeter portion that cooperates with the inner perimeter portion to define an elongated channel. The outer perimeter portion includes a first cantilever portion that extends over the elongated channel and towards the inner perimeter portion. The binding insert is configured for releasable insertion into the elongated channel. The binding insert includes a base and a tongue. The base configured to interface with a mesh substrate to facilitate coupling therebetween. The tongue is coupled to the base and extends substantially horizontally from the base. When the binding insert is inserted into the elongated channel, the tongue extending beneath the first cantilever portion to facilitate retention of the binding insert to the frame member. Methods are also provided.