Continuous Foaming Panel Apparatus with V-Shaped Hopper
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Solution Overview
Problem
Existing foaming systems for continuous production of panels with insulating foam struggle with achieving homogeneous distribution and guiding of the mixture, leading to trapped air bubbles and irregularities in the final product, compromising the quality of the panels.
Innovation Solution
The apparatus employs a configuration with a V-shaped hopper zone and calibrated slit, where the web materials converge to drag and distribute the reactive mixture symmetrically, ensuring simultaneous wetting and expansion, and includes guiding and resting means with adjustable curvature to maintain consistent foam expansion and prevent cell collapse, resulting in a homogeneous cell structure and improved mechanical and thermal insulation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a movable dispensing-distributing device is used to deposit reactive mixture on web material, then the device can cover the entire width of the panel, but at advancement speeds above 400 mm/sec it becomes significantly difficult to achieve uniform thickness distribution due to deceleration, stop, and reversal movements causing greater accumulation of reagent on edges
Solution Approach 1:
Instead of moving the dispensing device back and forth to cover the width, the invention inverts the approach by using multiple stationary dispensing pipes arranged across the width. The web material moves continuously at high speed, and each stationary pipe deposits mixture at a fixed position, eliminating the problems of acceleration and deceleration while maintaining full width coverage.
Solution Approach 2:
The single movable dispensing device is segmented into multiple stationary dispensing pipes distributed across the width of the web material. Each pipe handles a specific zone, allowing continuous deposition without movement interruptions. This segmentation enables high advancement speeds while maintaining uniform thickness distribution across the entire panel width.
2Productivity
If a fixed dispensing-distributing device with multiple holes is used to deposit reactive mixture, then the device can operate at high advancement speeds, but the deposited layer takes on a corrugated profile with higher and convex zones and lower mutually joined zones, causing air bubbles to be trapped
Solution Approach 1:
Each dispensing pipe is equipped with a flat dispensing surface that locally controls the flow of reactive mixture. The mixture flows laterally across the flat surface under gravity, ensuring uniform distribution in each local zone. This local quality control prevents the formation of corrugated profiles and ensures homogeneous deposition across the entire width, even at high advancement speeds.
3Productivity
If the web materials are moved at high advancement speeds (300-1000 mm/sec), then productivity is improved, but it becomes significantly difficult to achieve uniform distribution and guiding of the reactive mixture, leading to trapped air bubbles and vacuoles
Solution Approach 1:
The invention inverts the conventional approach by making the dispensing装置 stationary and moving the web material at high speed. This eliminates the relative motion problems between the dispensing device and web material, allowing high productivity while maintaining reliable, bubble-free mixture distribution through continuous, uninterrupted deposition.
Solution Approach 2:
The reactive mixture is deposited in advance onto the moving web material through multiple stationary pipes, creating a uniform layer before the web material proceeds to the foaming zone. This preliminary action ensures complete coverage and uniform distribution at high speeds, preventing air bubble formation during subsequent processing.
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 configuration ensures the production of panels with uniform physical and mechanical properties, free from air bubbles and vacuoles, enhancing the quality and consistency of the insulating foam layers.
Implementation Method 1
A device for dispensing a reactive mixture is provided that is suitable for wetting the first lower web material with the reactive mixture intended for generating an intermediate layer of insulating foam
Implementation Method 2
the web materials converge according to respective mutually converging directions to bound a V-shaped hopper zone, placed below said station for dispensing reactive mixture
Data Source
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AI summary
A method for continuous foaming of a panel (2) of the type comprising outer layers (3A, 3B) of web material between which an intermediate layer (5) of insulating foam is interposed, comprises the steps of: supplying a first (4A) and second (4B) web material, which are precursors of said outer layers (3A, 3B), according to respective mutually converging directions (D1, D2) to a dispensing station (SE) of reactive mixture intended for generating the intermediate layer (5) of insulating foam; maintaining the first (4 A) and second (4B) web materials oriented according to planes that tilt mutually and converge downwards so as to bound a V-shaped hopper zone (6); defining between the web materials (4A, 4B) a calibrated slit (7) in the bottom of the hopper zone (6) for dragging the reactive mixture with squeezing and distribution to the end edges of the web materials; filling at least partially the hopper zone (6) with the reactive mixture for simultaneously wetting the two web materials (4A, 4B) advancing downwards; advancing continuously the two web materials (4A, 4B) along a very steep, vertical or very tilted portion of path (Ty), dragging the reactive mixture progressively downwards; supplying, along the vertical portion a guiding and resting action to said first (4A) and second (4B) web materials so as to advance the first (4A) and second (4B) web materials substantially mutually parallel at a controlled mutual distance; diverting, downstream of the portion (Ty) of vertical or very tilted path, the web materials (4 A, 4B) along a successive curved portion (Tc) of foaming path; guiding, downstream of said curved portion (Tc), said first web material (4A) along a first resting and guiding plane (Pi), that is horizontal or almost horizontal, and said second web material (4B) along a second resting and guiding plane (P2), tilted with respect to the first resting and guiding plane (Pi), such that the first (4A) and second (4B) web materials advance in a mutually divergent manner at a growing distance from one another along a transition portion (Tt) of the foaming path along which a guided expansion of said reactive mixture develops; conveying, and providing a resting action to the web materials (4A) and (4B), with the interposed expanding foam, by means of two parallel belt conveying devices (8A, 8B), along a substantially horizontal final portion (Tf) of path to enable the foam reaction to be completed and the shape of the foam to be stabilised. An apparatus for implementing the aforesaid method is also disclosed.