Vacuum Coating Head Screed for Wood Panel Edge Finishing
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Solution Overview
Problem
Existing vacuum coating devices struggle to evenly distribute liquid painting products on porous and uneven surfaces of wooden panels, leading to issues like raised wood fibers and high material consumption or complex machinery requirements.
Innovation Solution
A vacuum coating head with two dispensing and two suction nozzles, featuring a screed that presses the painting product into wood pores, combined with a simplified design for reduced complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vacuum suction is used to recover excess painting product, then the painting product can be efficiently applied on the panel edge, but the suction raises wood fibres that protrude outside the coating film
Solution Approach 1:
The coating head is divided into multiple independent zones: dispensing slots for applying paint, suction openings for removing excess, and a screed for surface finishing. Each zone performs a specific function, allowing the system to achieve both efficient coating application and smooth surface finish by separating the suction function from the coating application function.
Solution Approach 2:
A screed is introduced as an intermediary element between the dispensing and suction operations. The screed presses the coating substance into the wood pores and smooths the surface, mediating between the paint application and the final surface quality, thereby preventing fiber protrusion while maintaining coating efficiency.
2Manufacturing precision
If a thick layer of painting product is applied to cover raised wood fibres, then the surface smoothness is improved, but the consumption of painting product increases significantly
Solution Approach 1:
The screed performs preliminary action by pressing the coating substance into the wood pores and smoothing the surface before the coating is fully set. This preliminary surface finishing prevents fiber protrusion from occurring, eliminating the need to apply additional thick layers of paint to cover raised fibers, thereby reducing overall paint consumption.
Solution Approach 2:
The mechanical pressing action of the screed replaces the need for additional paint layers. Instead of using more material (thick coating) to cover surface defects, a mechanical force is applied to press the paint into the pores and smooth the surface, achieving the same cosmetic effect with less material consumption.
3Manufacturing precision
If sanding groups are added to the coating machine to sand the coated edges, then the surface smoothness is improved, but the machine complexity and length increase
Solution Approach 1:
The screed combines multiple functions into a single element: it presses the coating into the wood pores, smooths the surface, and prepares the coating for final drying. This merged function replaces the need for separate sanding groups, simplifying the machine structure while achieving the same surface smoothness improvement.
Solution Approach 2:
The sanding function is extracted and replaced by the screed's pressing and smoothing action. Instead of adding complex sanding machinery, the patent extracts the essential function (surface smoothing) and achieves it through a simpler mechanical pressing action during the coating process itself.
4Manufacturing precision
If multiple suction openings are used to recover excess painting product, then the coating distribution becomes more uniform, but the device complexity increases
Solution Approach 1:
Each suction opening serves multiple purposes: it recovers excess painting product, creates a slight vacuum to control paint flow from the dispensing slots, and helps distribute the coating uniformly across the panel edge. This multi-functionality achieves uniform coating distribution without requiring a complex array of specialized components.
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
Achieves high-quality coating with reduced material consumption and apparatus length, while maintaining efficient application and adhesion, even on complex edges.
Implementation Method 1
a first suction nozzle for suctioning said painting product
Implementation Method 2
featuring a screed that presses the painting product into wood pores
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Vacuum coating head (23) for applying a painting product to an edge of wooden panels (1), said vacuum coating head being supplied by a vacuum tower (14) which provides to supplying and suctioning said painting product, said vacuum coating head (23) being characterized in that it comprises at least: - a first dispensing nozzle (51) for dispensing said painting product; - a first suction nozzle (52) for suctioning said painting product; - a second dispensing nozzle (55) for dispensing said painting product; - a second suction nozzle (56) for suctioning said painting product - comprising at least a screed (53) protruding with respect to the vacuum coating head profile, said screed (53) being placed preferably between said first suction nozzle (52) and said second dispensing nozzle (55) for a painting product.