Embossed Biodegradable Filter Paper for Cigarette Airflow Control
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Solution Overview
Problem
Existing cigarette filters made from non-biodegradable materials like cellulose acetate result in environmental pollution due to slow degradation, and existing biodegradable alternatives often require complex processes or introduce harmful chemicals.
Innovation Solution
A method for embossing a biodegradable substrate using first and second embossing rollers to create crimping lines, chimney structures, and stiffening grooves, enhancing air permeability and filtration capabilities while maintaining biodegradability, and optionally incorporating logos or QR-codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional filters made from cellulose acetate are used, then filtration function is provided, but biodegradability is poor causing environmental pollution
Solution Approach 1:
The patent changes the material composition parameter from conventional cellulose acetate to a blend containing biodegradable polymers (PLA, PCL, PGA) and natural fibers (cellulose, starch). This parameter change transforms the filter's biodegradability from poor to excellent, allowing complete decomposition within weeks to months while maintaining filtration functionality.
Solution Approach 2:
The patent employs composite materials by combining biodegradable polymers with natural fibers in specific ratios. This composite structure provides both the necessary mechanical strength for filter formation and enhanced biodegradability, as the natural fibers accelerate decomposition while the polymer matrix maintains structural integrity during use.
2Object-affected harmful factors
If biodegradable materials are used to replace cellulose acetate, then environmental sustainability is improved, but manufacturing complexity increases due to process requirements
Solution Approach 1:
The patent replaces complex chemical treatment processes with a simplified mechanical embossing system. The embossing rollers with specialized surfaces create the necessary filter structure through mechanical action alone, eliminating the need for chemical intermediates and complex processing steps while maintaining biodegradability.
Solution Approach 2:
The patent utilizes the inherent porosity of biodegradable polymer-natural fiber composites to achieve filtration without additional chemical treatments. The embossing process enhances this porosity by creating controlled void spaces and channels, allowing the material to function as an effective filter purely through its physical structure.
3Reliability
If embossing is performed to enhance filtration and air permeability, then filtration performance is improved, but risk of fiber cutting and structural damage increases
Solution Approach 1:
The patent applies local quality by designing embossing rollers with selectively distributed patterns of raised elements and recesses. Certain areas of the substrate receive embossing treatment to create filtration channels, while other areas remain untouched to maintain fiber integrity and structural strength. This localized approach ensures both filtration performance and fiber preservation.
Solution Approach 2:
The patent employs partial action by applying embossing pressure only to specific regions of the substrate rather than uniformly across the entire surface. The embossing rollers are designed with patterns that apply force selectively, creating necessary filtration structures in critical areas while avoiding excessive compression that would damage fibers or compromise overall substrate strength.
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 embossed substrate improves filtration performance and environmental sustainability by ensuring rapid biodegradation and effective smoke filtration without introducing harmful chemicals, with enhanced air permeability and structural integrity.
Implementation Method 1
providing means of at least a first embossing roller and a second embossing roller configured to emboss first structures and second structures, thereby embossing the sheet of substrate when this passes in a nip formed by the first and second embossing rollers
Data Source
AI summary
A method for embossing a sheet of substrate, wherein the embossing is realized by providing means of at least a first embossing roller and a second embossing roller configured to emboss first structures and second structures, thereby embossing the sheet of substrate when this passes in a nip formed by the first and second embossing rollers, whereby the embossed sheet of substrate is configured to be used in a manufacturing of cigarette filters, and is further configured to be entirely biodegradable. The method comprises providing a sheet of substrate. The method further comprises any one of the embossing steps in a list comprising: embossing the sheet of substrate with first structures to form crimping lines; embossing the sheet of substrate with second structures to form chimney structures; embossing the sheet of substrate with a combination of first and second structures to form crimping lines and chimney structures respectively. The crimping lines have a first width at a surface level of the sheet of substrate, and a first height or depth measured from the surface level in a first range of 0.1 mm to 0.5 mm, thereby configured to be deformable when used in the manufacturing process of cigarette filters. the chimney structures comprise segments that have a second width at the surface level of the sheet of substrate, in a second range of 0.5 mm to 5.0 mm, and a second height or depth measured from the surface level in a third range of 0.1 mm to 1.5 mm, thereby configured to remain open when used in the manufacturing process of cigarette filters and influence a pressure drop of air in such cigarette filters. Further the sheet of substrate comprises fibers with a cut length in a fourth range of 0.5 mm to 6.0 mm, and with a diameter in a fifth range of 10 μm to 500 μm, the fibers being entirely biodegradable and randomly distributed to deliver an air permeability. The sheet of substrate's air permeability being configured with filtration capabilities of substances present in a cigarette smoke.