Hot extraction paper
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Solution Overview
Problem
Conventional coffee and tea filters, as well as paper-based coffee capsules, face challenges in maintaining tensile strength and burst resistance when exposed to high temperatures and pressures, leading to potential contamination and environmental issues due to plastic and metal waste.
Innovation Solution
A hot extraction paper with pulp fiber lengths averaging at least 2.0 mm, exhibiting isotropic stretch properties and using only inorganic pH adjusters like sulfuric acid and caustic soda, is developed to enhance tensile strength and durability, while minimizing additives and ensuring no harmful substances are carried into beverages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional coffee filters and paper-based coffee capsules are used, then they are biodegradable and environmentally friendly, but they lose tensile strength and burst resistance when exposed to high temperatures and pressures
Solution Approach 1:
The patent changes the physical parameters of the paper by using pulp with specifically controlled fiber lengths (at least 2.0 mm in length-weighted average) to maintain structural integrity under high temperature and pressure conditions while preserving biodegradability
Solution Approach 2:
The patent creates a composite paper structure combining long fiber pulp (at least 2.0 mm) with controlled isotropic stretch properties (at least 7.5% in both machine and transverse directions) to achieve both environmental friendliness and mechanical strength under extraction conditions
2Adaptability or versatility
If paper is stretched and shaped into capsule forms, then capsule production is enabled, but the paper may tear or destroy fiber structure under high temperatures and pressures
Solution Approach 1:
The patent optimizes the stretch properties parameter to be isotropic (essentially the same in machine and transverse directions) with a minimum of 7.5%, allowing uniform deformation during capsule forming while maintaining structural integrity under subsequent thermal and pressure exposure
Solution Approach 2:
The patent applies different fiber length requirements to different functional needs: longer fibers (at least 2.0 mm) provide tensile strength and burst resistance, while the isotropic stretch property (at least 7.5%) enables uniform shaping without tearing during capsule formation
3Ease of manufacture
If conventional papermaking additives are used to improve paper properties, then manufacturing is easier, but harmful substances may be carried into beverages during extraction
Solution Approach 1:
The patent removes harmful organic additives from the papermaking process, using only inorganic pH adjusters (acids and/or bases) that are absolutely necessary for cellulose production, thereby eliminating substance contamination during beverage extraction while maintaining manufacturing feasibility
Solution Approach 2:
The patent changes the chemical composition parameters by strictly limiting additives to inorganic pH adjusters only, ensuring that no harmful organic substances are carried into beverages during hot water extraction while still achieving the required paper properties
Data Source
AI summary
In the case of a hot-extraction paper consisting substantially of cellulose and manufacturing assistants needed in cellulose production, such as pH modifiers based on acids and/or bases, the paper comprises exclusively cellulose having fibre lengths of at least 2.0 mm on length-weighted average, more particularly at least 2.5 mm on length-weighted average, and has isotropic extension properties which are substantially equal in machine and cross directions and amount to at least 7.5%, more particularly at least 8.5%.