Foam Profile Section Forming With Pre-Shaped Facing Webs
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Solution Overview
Problem
Existing methods for producing shaped profile sections, such as phenolic foam pipe insulating sections, face challenges in achieving precise profiles and maintaining shape integrity due to insufficient pressure from foam reactants, leading to misshapen profiles.
Innovation Solution
A continuous line process and apparatus where the outer and inner facing webs are pre-formed into desired shapes using complementary roller couples and micro-ribbing, followed by the application of liquid foam reactants, ensuring the foam is constrained to maintain the exact profile shape through engagement with pre-formed molds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid foam reactants are applied directly to flat facing webs, then the production process is simple, but the foam cannot maintain precise profile shapes due to insufficient pressure
Solution Approach 1:
The facing webs are pre-formed into the desired profile shape using roller couples before the foam reactants are applied. This preliminary shaping ensures that the foam is constrained within pre-defined boundaries, allowing it to cure into the exact desired profile without requiring complex molding equipment during the foaming process itself.
Solution Approach 2:
The pre-formed facing webs act as intermediary structures that transfer the desired profile shape to the foam. Instead of using complex molds to directly shape the foam, the facing webs serve as intermediate forms that guide the foam expansion and define the final profile geometry.
2Manufacturing precision
If foam reactants are allowed to expand freely, then the production process is fast, but the foam produces misshapen profiles with poor insulation performance
Solution Approach 1:
The facing webs are pre-formed with varying local geometries corresponding to different sections of the desired profile. Each section of the facing web is shaped to match the specific local requirements of the profile, allowing the foam to expand uniformly throughout different sections and maintain consistent shape and insulation properties across the entire product.
3Manufacturing precision
If the facing webs are rigid and pre-formed, then the profile shape is precise, but the foam reactants cannot adequately conform to complex curved surfaces
Solution Approach 1:
The facing webs are pre-formed into the exact outer profile shape required, creating rigid boundaries that define the final product geometry. This preliminary action ensures that regardless of the foam's expansion characteristics, the final profile will match the desired shape with high accuracy.
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 method ensures the production of shaped profile sections with precise and consistent thermal insulation properties, maintaining desired shapes and achieving low thermal conductivity, with foams having closed cell content and low environmental impact blowing agents.
Implementation Method 1
liquid foam reactants are laid down on the outer facing web... as the foam formed by the liquid foam reactants rises within the pre-formed outer facing web
Data Source
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AI summary
The present invention provides a method for producing a shaped profile section in a continuous line process, the method comprising steps of: providing an outer facing web, providing an inner facing web and laying down an liquid foam reactants in the outer facing web. The method also comprises steps of pre-forming the outer facing web into a desired outer profile shape prior to laying down the liquid foam reactants, and shaping the inner facing web with the liquid foam reactants within the pre-formed outer facing web to provide a desired inner profile shape for the shaped profile section. The present invention also relates to an apparatus for producing a shaped profile section and a shaped profile section produced according to the method.