Cylindrical Foam Extrusion Die Preserving Natural Skin
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Solution Overview
Problem
Current methods for manufacturing cylindrical foam articles, such as pipe insulation, result in significant waste due to the need for cutting rectangular or square blocks into semi-circular shapes, which compromises the natural skin and insulation properties of the foam.
Innovation Solution
A system comprising an extruder, die assembly, and die outlet assembly that continuously extrudes polymer foam into cylindrical shapes, utilizing a die outlet assembly with a pressure drop mechanism to form a natural skin and minimize waste by producing cylindrical foam articles directly, reducing the need for post-cutting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If rectangular or square foam blocks are manufactured and then cut into semi-circular shapes for cylindrical pipe insulation, then the manufacturing process is simple and equipment requirements are basic, but significant waste foam is generated and the natural skin is compromised
Solution Approach 1:
The patent applies curvature by designing a die outlet assembly with a curved or semi-circular cross-section that directly forms cylindrical foam articles. The die outlet geometry transitions from a rectangular extrusion path to a curved path, allowing the foam to emerge in the desired cylindrical shape without cutting, thereby eliminating waste and preserving the natural skin.
Solution Approach 2:
The patent implements preliminary action by pre-shaping the foam article within the die outlet assembly before extrusion. The die outlet is designed with a curved configuration that forms the cylindrical shape during the extrusion process itself, rather than requiring subsequent cutting operations. This preliminary shaping action eliminates the need for post-extrusion fabrication.
2Manufacturing precision
If rectangular foam blocks are cut into semi-circular shapes, then standard cutting equipment can be used, but the natural skin of the foam is compromised and insulation properties are reduced
Solution Approach 1:
The die outlet assembly employs a curved geometry that directly forms the cylindrical shape of the foam article during extrusion. This curvature-based design ensures precise cylindrical dimensions are achieved at the point of formation, eliminating the need for cutting operations that would compromise the natural skin and reduce compressive strength.
3Productivity
If post-cutting processes are used to fabricate cylindrical shapes from rectangular blocks, then flexibility in handling rectangular foam is maintained, but manufacturing efficiency is reduced and waste increases
Solution Approach 1:
The die outlet assembly performs the cylindrical shaping action preliminarily during the extrusion process itself. The curved die geometry forms the final cylindrical shape as the foam emerges, eliminating the need for separate cutting operations. This preliminary formation significantly improves manufacturing efficiency by combining shaping and extrusion into a single continuous operation.
Solution Approach 2:
The patent enables continuous production of cylindrical foam articles by integrating the shaping function into the extrusion process. The foam is continuously extruded through the curved die outlet, forming cylindrical shapes without interruption or discontinuous cutting operations. This continuous action improves productivity while maintaining process simplicity.
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
The system significantly reduces waste generation and enhances the compressive strength and insulation value of the foam by maintaining a natural skin on the cylindrical foam articles, improving manufacturing efficiency and product quality.
Implementation Method 1
an outlet adaptor configured to create a pressure drop to cause formation of the foam article
Implementation Method 2
a diameter of the outlet flow channel expands at the second end of the outlet adaptor to create the pressure drop to cause formation of the foamed article
Data Source
Figure 1
Figure 2
Figure 2B
AI summary
The present teachings provide a system and method for producing a cylindrical foam article. The method can include coupling a first end of an outlet adaptor to a die, and coupling the die to a die housing of an extruder. The method can also include coupling a substantially cylindrical die outlet to a second end of the outlet adaptor, and substantially continuously extruding a polymer through the outlet adaptor into the die outlet to create the cylindrical foam article with a natural skin formed about a perimeter of the cylindrical foam article.