Biodegradable Composite Sheet for Propagation Plugs
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Solution Overview
Problem
Conventional production methods for propagation plugs in organic agriculture face challenges as they require paper to retain strength when wet, and existing adhesives like hot melt adhesives based on petrochemicals are not suitable for organic production.
Innovation Solution
A biodegradable air permeable composite sheet material is used, comprising a nonwoven sheet coated with a binder formulation of polysaccharides and low molecular weight organic acids, along with a hot melt adhesive comprising biodegradable bioplastics, which provides strength and stability to the paper even when wet, while being compatible with organic production standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional hot melt adhesive based on petrochemicals is used to coat the paper, then the paper retains its strength when wet, but the adhesive is not suitable for organic production
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive by using biodegradable alternatives (starch, cellulose, lignin, protein, or their derivatives) instead of petrochemical-based hot melt adhesives. This substitution maintains the adhesive's functional properties (strength when wet) while eliminating harmful petrochemical substances, thus resolving the contradiction between strength and organic production compatibility
Solution Approach 2:
The patent employs composite adhesive formulations combining multiple natural polymers (starch, cellulose, lignin, protein) and their derivatives to achieve the required mechanical properties. This composite approach allows optimization of both adhesive strength and biodegradability, resolving the contradiction between maintaining paper strength and using organic-compatible materials
2Strength
If conventional binder is used to coat the paper, then the paper retains its strength when wet, but the binder cannot be used in propagation plugs for organic production
Solution Approach 1:
The invention transforms the binder's chemical composition from conventional chemically-processed materials to natural polymers and their derivatives (carboxymethyl cellulose, oxidized starch, carboxymethyl starch, polyuronic acid, etc.). This parameter change maintains the binder's ability to retain paper strength when wet while ensuring compatibility with organic production standards
Solution Approach 2:
The patent uses biodegradable binder materials that are naturally decomposable, replacing conventional persistent chemical binders. These natural polymer-based binders provide temporary structural support during the propagation process and then degrade naturally, eliminating harmful chemical residues while maintaining paper strength during use
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 solution ensures that the paper sheets maintain strength and stability in wet conditions, meeting organic production requirements and enabling the production of propagation plugs suitable for organic agriculture without using petrochemical-based adhesives.
Implementation Method 1
a biodegradable and air permeable nonwoven sheet material which is coated with a binder formulation consisting of carboxymethyl cellulose and organic acid
Implementation Method 2
a hot melt adhesive supplied to at least a part of a face of the biodegradable and air permeable nonwoven sheet material
Data Source
Figure 1
AI summary
The present invention relates to the production of propagation plugs, primarily small blocks of sphagnum (2) for the growing of cuttings and seed plants, and of the type consisting of a cylindrical block having an envelope of paper or a similar material and an associated filling of sphagnum (2) or a corresponding substrate material. The paper is an air permeable composite sheet material (14) comprising a) a biodegradable nonwoven sheet material; and b) a hot melt adhesive comprising at least 50% w/w of one or more biodegradable bioplastics. The hot melt adhesive is supplied to at least a part of a face of the biodegradable nonwoven sheet material (14).