Continuous Foam Shell Production via Molded Expansion
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Solution Overview
Problem
The production of cylindrical shells or half-shells with thermal insulation properties for pipes results in significant waste due to traditional cutting methods, and existing methods are complex and inefficient.
Innovation Solution
A continuous production installation using a double linear conveyor system with removable male and female molds that allow for in-situ formation and expansion of polyurethane or polyisocyanurate foam, eliminating the need for subsequent cutting and enabling direct use of the shells around pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional cutting methods are used to shape foam blocks into cylindrical shells, then the desired shape and dimensions are achieved, but significant waste is generated (25-50% of initial volume)
Solution Approach 1:
The foam constituents are injected into molds that already define the final cylindrical shape and dimensions. The foam expands in-situ within the molds to form shells with precise geometry from the beginning, eliminating the need for subsequent cutting operations that would generate waste.
Solution Approach 2:
The physical state of the foam material changes from liquid constituents to expanded solid foam within the molds. This phase change allows the material to take on the precise shape of the mold cavity, achieving accurate dimensions without mechanical cutting and thereby preventing waste generation.
2Manufacturing precision
If foam blocks are cut to achieve desired shell dimensions, then the correct size is obtained, but production time is increased due to multiple operations
Solution Approach 1:
The molds are pre-configured with the exact dimensions and shape requirements for the cylindrical shells. By injecting foam constituents into these pre-prepared molds, the shells are formed with correct dimensions in a single operation, eliminating multiple cutting steps and accelerating production.
Solution Approach 2:
The foam constituents are continuously injected into the molds and expand in-situ to form complete shells. This continuous forming process replaces discontinuous cutting operations, maintaining productive action throughout the manufacturing cycle and increasing overall production speed.
3Ease of manufacture
If complex methods are used to produce thermal insulation shells, then production capability is achieved, but device complexity increases
Solution Approach 1:
The complex post-processing cutting operations are extracted and eliminated from the manufacturing process. The invention uses simple injection molds that directly form the final shell shape, removing the need for abrasive wire cutting equipment and associated complex machinery while maintaining production capability.
Solution Approach 2:
The invention changes the manufacturing approach from mechanical cutting to chemical expansion and physical molding. By injecting liquid foam constituents that expand and solidify within simple molds, the process becomes less complex while maintaining the ability to produce precise thermal insulation shells.
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 solution drastically reduces waste, allows for immediate use of the shells without additional elements, and enables high-production rates with shells being automatically cut to standard lengths, enhancing thermal insulation efficiency and environmental sustainability.
Implementation Method 1
once the respective constituents have been injected, for their interaction (while respecting the desired densities) to allow the expansion of the resulting foam, and then the solidification of said foam
Implementation Method 2
allow the expansion of the resulting foam, and then the solidification of said foam
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
This installation for the continuous production of cylindrical shells or half-shells with thermal insulating properties comprises: • a double linear conveyor with discrete progression in the same direction and at the same speed respectively: ▪ a lower conveyor (1) receiving a plurality of removable female molds (2); ▪ an upper conveyor (3), located above the lower conveyor (1), and receiving an identical quantity of removable male molds (4); said male and female molds being shaped to define between them, in operational position, a semi-cylindrical volume; said double conveyor being able to move the molds between a filling station (10) of said volume (15) and a receiving and retrieval station (13) of the shells or half-shells;• at least one introduction tube (17) into the volume (15) thus defined at the level of the filling station (10) of constituents capable of interacting with each other in order to constitute a polyurethane or a polyisocyanurate.;