Stencil Foil Assembly with Rigid Frame for SMT Safety
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Solution Overview
Problem
Current stencil foil assemblies for surface mount solder paste printing pose safety hazards due to sharp edges, are prone to damage during handling and storage, and require complex and costly preparation, making them difficult to use and store effectively.
Innovation Solution
A stencil foil assembly kit with a rigid frame and snap-on cover members that securely hold the stencil foil in place, protecting users from sharp edges and facilitating easy handling and storage, while allowing for tensioning and adaptation to standard stretch frames without specialized tools or equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional foil stencils are used, then the stencil can be made thin and flexible, but the sharp edges create safety hazards and the foil is prone to damage during handling and storage
Solution Approach 1:
The stencil system is divided into two separate components: a thin foil stencil and a frame assembly. The foil can be handled independently for mounting, then secured to the frame which provides structural protection. This segmentation allows the foil to remain thin and flexible while the frame provides edge protection and structural integrity during handling and storage.
Solution Approach 2:
The frame acts as an intermediary structure between the user and the sharp foil edges. When the foil is mounted in the frame, the frame's border provides a protective barrier that prevents direct contact with sharp edges, eliminating the safety hazard while maintaining the foil's printing functionality.
2Object-affected harmful factors
If polyester encapsulation is added to protect foil edges, then safety is improved, but the preparation process becomes time-consuming and expensive requiring special molding machinery
Solution Approach 1:
Instead of using expensive polyester encapsulation that requires special molding machinery, the invention uses a simple frame with a border that can be manufactured using conventional techniques. The frame provides equivalent protection against sharp edges but can be produced more economically and assembled without specialized equipment.
Solution Approach 2:
Rather than encapsulating the foil edges with polyester (adding material around the foil), the invention inverts the approach by placing the foil within a frame structure that provides protection from the outside. This reversal simplifies the preparation process while achieving the same safety objective.
3Object-affected harmful factors
If polyester encapsulated foil stencils are used, then edge protection is provided, but the stencils become difficult to store and cannot be easily retrieved when stacked
Solution Approach 1:
The stencil system is divided into a foil component and a frame assembly component. This segmentation allows the framed stencil to be stored upright or stacked efficiently, improving storage ease and retrievability compared to encapsulated foils that are difficult to handle when stacked.
4Productivity
If foil stencils are transported to and from storage location, then normal handling is required, but the foil undergoes bending that threatens its integrity
Solution Approach 1:
The frame serves as an intermediary structure that supports the foil during transport and handling. By mounting the foil in the frame, the rigid structure prevents bending and maintains foil integrity while allowing normal handling procedures during transportation to and from storage locations.
Data Source
AI summary
A stencil assembly includes a stencil foil, having a stencil pattern thereon and of a planar configuration, with a peripheral edge, which is a captured by rigid frame. The rigid frame includes a base and a cover attached thereto. The assembly adapts a standard stencil foil for use in a stretch frame that requires an elongated groove. The assembly thereby facilitates mounting the stencil to a stretching machine during printing. Also, the stencil assembly protects a user from injury by preventing contact with the sharp outer edges of the stencil foil. Further, the assembly protects the stencil foil portion from damage and greatly facilitates handling thereof.