Grid Roller Coating for Cellulose Packaging Moisture Control
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Solution Overview
Problem
Current methods for applying a coating layer to cellulose packaging materials to control moisture vapor permeability are either expensive, complex, and lack controllability, or have limited productivity and irregular coating application.
Innovation Solution
A method using a grid roller with recesses to take up and apply a predetermined quantity of coating material, allowing for controlled application and patterned distribution to achieve optimal moisture vapor permeability and adhesion characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spray installation is used to apply coating layer material, then the coating material can be applied to the cellulose packaging material, but the coating material must have low viscosity which makes it expensive and difficult to manufacture
Solution Approach 1:
The patent replaces the spray installation (aerosol/mist delivery system) with a mechanical roller application system. The roller with recesses mechanically picks up and transfers coating material directly to the substrate, eliminating the need for spray atomization and allowing use of higher viscosity materials.
Solution Approach 2:
The roller surface is designed with recesses that function as porous structures to selectively absorb and retain coating material. These recesses capture the coating material and transfer it in controlled amounts to the cellulose packaging material, enabling precise coating application.
2Productivity
If a rotary press is used to apply coating layer material, then productivity is considerably higher, but the quantity of coating layer material applied can hardly be set and control is limited
Solution Approach 1:
The roller surface is segmented into multiple recesses distributed across its surface. Each recess acts as an independent coating reservoir, allowing precise control over the total coating quantity applied. The segmented structure enables consistent, repeatable coating amounts while maintaining high-speed production.
Solution Approach 2:
The patent controls coating quantity by changing physical parameters of the recesses (depth, volume, surface area) rather than relying on pressure control. By adjusting recess dimensions, the coating material quantity is predetermined and consistent, achieving manufacturing precision through geometric parameters.
3Manufacturing precision
If pressure of the pressing cylinder is reduced to control coating application, then coating quantity can be adjusted, but irregularities in the coating layer occur
Solution Approach 1:
The recesses on the roller surface automatically regulate the coating material quantity through their fixed geometric dimensions. The system is self-regulating - each recess picks up and transfers a predetermined amount of coating material without requiring external pressure control mechanisms, ensuring consistent and uniform coating application.
4Ease of operation
If a spray installation is used to apply coating layer material, then coating can be applied to the cellulose packaging material, but the installation is complex and high-maintenance
Solution Approach 1:
The patent extracts and eliminates the complex spray system components (nozzles, pressure regulators, atomization mechanisms) by replacing them with a simple roller-based mechanical transfer system. The essential coating application function is retained while removing unnecessary complexity and maintenance requirements.
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
The method provides a cost-effective, controllable, and efficient application of the coating layer, enhancing the moisture vapor permeability and adhesion properties of cellulose packaging materials, making them a viable alternative to conventional plastics.
Implementation Method 1
Because the plurality of recesses of the grid zone take up a predetermined quantity of coating layer material, for instance by a capillary action of the recesses, then retain this quantity of coating layer material
Data Source
AI summary
Method for applying a coating layer to a cellulose packaging material, comprising: providing a cellulose layer with a first side and a second side: providing a moving endless surface comprising a grid zone with a plurality of recesses: taking up a predetermined quantity of coating layer material in the plurality of recesses of the grid zone: retaining the predetermined quantity of coating layer material in the plurality of recesses: bringing the grid zone into contact with the first side of the cellulose layer: applying the predetermined quantity of coating layer material to the first side of the cellulose layer from the plurality of recesses: and forming a coating layer on the first side of the cellulose layer with the predetermined quantity of coating layer material.