Sewing and Overmolding for Complex Geometries
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Solution Overview
Problem
Current 3D printing technologies face challenges in designing and manufacturing objects with specific structural, thermal, electrical, electromagnetic, and chemical properties, as they often require complex geometries and customization, which are difficult to achieve economically and efficiently.
Innovation Solution
The method involves sewing substrates with specific materials and stitches, followed by overmolding with thermoplastic or thermoset, allowing for the tailoring of physical properties such as structural, thermal, electrical, and chemical attributes by using threads made from materials like continuous carbon fiber, metal, and synthetic fibers in specific locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional 3D printing is used to manufacture objects with complex geometries and customized properties, then design flexibility and customization are improved, but manufacturing cost and complexity increase significantly
Solution Approach 1:
The invention divides the manufacturing process into two distinct stages: sewing stage (adding structural elements and reinforcement) and overmolding stage (forming the final part). This segmentation allows each stage to be optimized independently, reducing overall manufacturing complexity while maintaining design flexibility.
Solution Approach 2:
The invention uses composite construction by combining sewn substrates (fabric, mesh, or other materials) with thermoplastic overmolded material. This composite approach enables tailored physical properties (structural, thermal, electrical) while using simpler, more economical manufacturing processes for each component.
2Adaptability or versatility
If traditional 3D printing is used to achieve specific physical properties (structural, thermal, electrical), then property customization is improved, but manufacturing cost increases
Solution Approach 1:
The invention applies different materials and stitching patterns in specific locations based on required properties. For example, continuous carbon fiber threads are used in areas requiring electrical conductivity or enhanced strength, while standard fabric is used in other areas. This localized customization reduces overall material costs while achieving specific physical properties where needed.
Solution Approach 2:
By combining different materials (fabric substrates, various threads, thermoplastic) in a composite structure, the invention achieves tailored physical properties through material selection rather than complex processing. The thermoplastic overmold provides structural properties, while the sewn substrate contributes thermal, electrical, or mechanical properties as needed.
3Manufacturing precision
If complex stitches and thread materials are used to tailor physical properties, then property control is improved, but manufacturing complexity increases
Solution Approach 1:
The invention separates property control functions into the sewing stage (where threads and stitching patterns establish structural, thermal, and electrical properties) and the overmolding stage (where the thermoplastic provides final structural integration). This segmentation simplifies the sewing process by focusing only on property establishment rather than final part formation.
Solution Approach 2:
The invention controls physical properties by changing parameters such as thread material type (carbon fiber for conductivity, natural fibers for thermal insulation), stitch pattern (density, type, location), and substrate material. These parameter changes provide precise property control through material and process selection rather than mechanical complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the easy and economic fabrication of objects with tailored properties, allowing for the creation of complex geometries and customized articles that cannot be manufactured efficiently with prior art methods.
Implementation Method 1
overmolding the sewn substrates with thermoplastic or thermoset or thermoplastic and thermoset
Data Source
AI summary
The illustrative embodiment comprises the sewing of fibers into a sewing substrate, which is then overmolded, to enable the manufacture of strong and lightweight articles with complex geometries.