Movable-Core Mold for Variable-Density Foamed Articles
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Solution Overview
Problem
Existing methods for forming foamed polymeric articles, such as cups or containers, struggle to achieve consistent density variations and structural features that enhance rigidity and insulation while maintaining ease of manufacturing.
Innovation Solution
A mold system with movable cores that adjust cavity dimensions during the molding process, allowing for varying densities and structural projections, including a first mold portion and a second movable mold portion with interior and exterior cores that expand to form a polymeric article with distinct density layers and projections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a movable core system is used to create density variations and structural projections, then the rigidity and insulation properties of the polymeric article are enhanced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The mold system is divided into separate movable core components (first movable core and second movable core) that can independently position and move. This segmentation allows each core to control specific density regions and structural features, enabling complex density variations and projections while maintaining manageable system complexity through modular design
Solution Approach 2:
The movable cores are configured to change position dynamically during the molding process. By moving the cores to different positions, the system can create varying cavity volumes that produce different material densities in different regions, and can also form structural projections. This dynamic positioning capability allows a single mold system to produce multiple density patterns and geometric features without requiring multiple specialized molds
2Temperature
If the mold cavity is enlarged during molding to create density variations, then the insulation properties are improved, but the manufacturing precision and control difficulty increase
Solution Approach 1:
The movable cores enable local variation of cavity volume at different positions and times during molding. By selectively moving cores to enlarge specific regions of the cavity, the system creates localized density variations where material expands more in certain areas than others. This local control of cavity dimensions produces the desired density gradients that enhance insulation properties while maintaining overall manufacturing precision through controlled, localized adjustments rather than uniform changes
3Adaptability or versatility
If multiple movable cores are used to form complex density patterns, then the product versatility is enhanced, but the ease of manufacture and operational complexity increase
Solution Approach 1:
The mold system employs nested movable cores where one core can be positioned within or alongside another core. This nesting arrangement allows the cores to work in coordination, with each core contributing to different aspects of the density pattern formation. The nested configuration enables complex density variations to be achieved through the combined action of multiple cores, while the hierarchical structure provides a logical framework for controlling and operating the system
Data Source
AI summary
A mold is configured to form a polymeric article. The mold includes a first mold portion and a second mold portion. The polymeric article formed by the mold includes regions having varying densities. A method includes forming a cellular polymeric article having regions of varying densities between the first mold portion and the second mold portion.