Dry Cellulose Product Imprinting for Crack Prevention
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Solution Overview
Problem
Existing dry-forming methods for rigid cellulose products face challenges such as high energy consumption, complex and costly manufacturing processes, and the risk of cracking during the pressing step, especially for complex or deep product designs.
Innovation Solution
A method and apparatus for dry manufacturing rigid cellulose products with an imprinted pattern applied to the cellulose blank before pressing, using a support structure and molding tool to enhance internal bonding in specific areas, preventing cracks while allowing formability in other areas, and optional heating for improved rigidity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dry-forming methods are used for rigid cellulose products, then production speed and energy efficiency are improved, but the risk of cracking during pressing increases
Solution Approach 1:
The patent applies local quality by creating an imprinted pattern with varying density across the cellulose blank. Areas with higher imprint density receive more compression and heat treatment, increasing their rigidity and resistance to cracking, while areas with lower imprint density remain more flexible for forming. This spatial variation in treatment resolves the contradiction by providing crack resistance where needed without compromising overall formability.
Solution Approach 2:
The patent applies preliminary action by pre-compressing and pre-heating specific areas of the cellulose blank through the imprinted pattern before the final pressing step. This preliminary treatment strengthens the cellulose structure in advance, preventing cracks during the subsequent forming operation while maintaining production efficiency.
2Manufacturing precision
If complex pressing processes are used to form deep products, then product shape accuracy is improved, but the risk of cracking and manufacturing complexity increase
Solution Approach 1:
The imprinted pattern creates local variations in compression and heat treatment that match the required product geometry. Areas corresponding to deep or complex product regions receive enhanced treatment, providing localized strength where needed while keeping the overall process simple and the mold design straightforward.
Solution Approach 2:
The patent changes physical parameters (compression level and temperature) in specific regions through the imprinted pattern. By varying these parameters spatially, the process achieves complex shape accuracy without requiring complex pressing mechanisms, as the parameter changes themselves provide the necessary form guidance and structural support.
3Strength
If multilayer structures with prefabricated tissue layers are used, then product strength is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent extracts the strengthening function from complex multilayer structures and implements it through a single-layer cellulose blank with an imprinted pattern. The imprint pattern itself provides the necessary structural reinforcement without requiring additional tissue layers or complex assembly processes, thereby reducing manufacturing complexity while maintaining product strength.
Solution Approach 2:
The patent replaces expensive and complex prefabricated tissue layers with a simple, single-use imprinted cellulose blank. The imprint pattern is applied directly to the blank and provides sufficient strength for the application, eliminating the need for costly multilayer construction while maintaining adequate product performance.
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 and apparatus provide tailored strength and rigidity to the cellulose products, preventing cracks and simplifying the pressing process, while maintaining flexibility and reducing production costs and energy consumption.
Implementation Method 1
imprinting said cellulose blank by providing an imprinted pattern onto the cellulose blank... at the partially compressed/imprinted locations there is an increased internal bonding between individual cellulose fibres
Implementation Method 2
said method further comprises the step of heating said molding tool while producing said rigid cellulose product, and/or heating said cellulose blank prior to producing said rigid cellulose product
Data Source
AI summary
A method for dry manufacturing rigid cellulose products having an essentially non-flat general shape from cellulose fibres comprising the steps of: providing a quantity of separated cellulose fibres from a dry cellulose raw material in at least one separating unit, providing the separated cellulose fibres onto a support structure for forming a cellulose blank, producing the rigid cellulose product having essentially non-flat general shape by pressing the cellulose blank in a product forming unit having a moulding tool for forming the rigid cellulose product, by means of at least one imprinting tool before the step of producing the rigid cellulose product, imprinting the cellulose blank by providing an imprinted pattern onto the cellulose blank to increase internal bonding between individual cellulose fibres at the location of the imprinted pattern to prevent mutual separation of the individual cellulose fibres during the pressing of the cellulose blank in the product forming unit.