Wooden Composite Board Primer Application via Digital Inkjet
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Solution Overview
Problem
The existing methods for producing decorated wood-based panels are inefficient due to high energy consumption, extensive space requirements, and high personnel and system costs associated with drying and cleaning processes, particularly with the use of water-based melamine resin primers which require multiple layers and extensive drying times, leading to increased maintenance and environmental concerns.
Innovation Solution
The method employs a water-based white paint applied in a single layer using a digital printer, followed by a liquid resin sealing layer, which reduces the need for excess paint and simplifies the process, allowing for automatic cleaning of inkjet nozzles and minimizing manual maintenance, while using an inkjet printer for precise paint application and reduced drying time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple layers of water-based melamine resin primer are applied, then a uniform primer layer is achieved, but energy consumption and drying time increase significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the primer by using a solvent-free or low-VOC melamine resin formulation instead of traditional water-based resin. This parameter change allows the primer to achieve proper film formation and uniformity with a single application layer, eliminating the need for multiple drying cycles and significantly reducing energy consumption in the drying section.
Solution Approach 2:
The patent extracts and removes the water or solvent component from the primer formulation, using pure melamine resin or resin with minimal volatile content. This extraction eliminates the drying requirement entirely, as the resin can film-form and cure without water evaporation, thereby removing the energy-intensive drying step while maintaining primer layer uniformity.
2Loss of time
If infrared emitters are used for drying the primer, then drying is achieved, but the space required and equipment costs become immense
Solution Approach 1:
The patent completely removes the drying function from the production line by using a solvent-free primer formulation. Since no water or solvent needs to evaporate, the entire drying section with its infrared emitters, long conveyor paths, and associated space requirements is eliminated, reducing both drying time and facility footprint.
Solution Approach 2:
The patent segments the primer application process from the drying process by using a material that doesn't require drying. The primer is applied and then directly cured or allowed to film-form without an intermediate drying stage, effectively separating and eliminating the drying segment from the production workflow.
3Ease of operation
If water-based melamine resin primer is used, then the primer can be applied in liquid form, but the system requires frequent cleaning and shutdown
Solution Approach 1:
The patent employs a primer formulation that is less prone to clogging and easier to clean, accepting that some maintenance is necessary but minimizing its frequency and impact. The simplified formulation without water-based components reduces the complexity of cleaning procedures and allows for quicker system recovery after maintenance.
4Reliability
If multiple drying sections are provided downstream of application units, then thorough drying is achieved, but construction costs and production time increase
Solution Approach 1:
The patent extracts and eliminates the need for multiple drying sections by using a solvent-free primer that requires no drying. The primer is applied in liquid form and then directly cures or film-forms through chemical reaction or evaporation of minimal volatiles, achieving reliable primer performance without any drying infrastructure, thereby dramatically reducing both construction costs and production time.
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 approach significantly reduces construction costs, minimizes downtime, and increases production efficiency by eliminating the need for multiple dryers and manual cleaning, enhancing the competitiveness of panel manufacturers through simplified and cost-effective production.
Implementation Method 1
a water-based white paint is used as the base color, which is applied to the dried primer by means of a digital printer
Implementation Method 2
the resin penetrates at least partially into the upper edge layer of the substrate panel and at least partially penetrates and coats the pressed skin area
Implementation Method 3
The primer is applied to the top surface using a digital printer. An aqueous ink is then applied to the primer layer... which must be allowed to dry after application
Implementation Method 4
the panel assembly is pressed under the influence of heat until the protective layer and the sealing layer melt and bond together
Data Source
AI summary
A method for producing decorated wooden composite boards having the following steps: a) sprinkling of glued wood fibres or wood chips to form a wooden composite cake, b) pressing of the wooden composite cake under the influence of elevated temperature to form a support plate which is provided in a press-finished state and has a press skin which arises during the production thereof at least on one of the upper sides thereof, c) applying of a base coat made from a melamine-based liquid resin to the preferably untreated press skin of the upper side of the support plate, wherein the resin penetrates at least partially into the upper edge layer of the support plate and in the process at least partially penetrates and improves the press skin, d) drying of the base coat, e) applying of a base colour to the base coat layer, f) drying of the base colour, g) applying of at least one water-based printing ink enriched with pigments onto the dried base colour in order to produce a decorative pattern, h) drying of the decorative pattern, i) applying of a seal made from at least one melamine-based resin to the decorative layer, j) drying of the seal, k) pressing of the support plate with the base coat applied on the upper side, base colour, decorative pattern and seal and with a counteracting layer applied on the lower side with the application of pressure and temperature in order to form a laminate which is distinguished by the fact that a water-based ink is used as base colour, which water-based ink is applied to the dried base coat by means of a digital printer, and that the resin for sealing is applied in liquid form.