Legume Starch Adhesive for Corrugated Board
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Solution Overview
Problem
Current adhesive compositions for corrugated fibreboards face challenges in meeting modern equipment requirements, such as high rheology and performance, while being simple to employ, cost-effective, and easily accessible in terms of supply and regulations. They also struggle to provide water-resistant adhesive joints using a single amylaceous material and must navigate health and environmental concerns related to formaldehyde resins.
Innovation Solution
Development of novel aqueous adhesive compositions using legume starches, particularly pea starch, with a primary part composed of solubilized starch and a secondary part of insoluble or partially swollen granules, which include a unique combination of native and modified starches, and optionally incorporate formaldehyde-free or low-formaldehyde resins and chemical agents like zinc sulphate for enhanced water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive compositions use multiple amylaceous materials to achieve water resistance, then water resistance is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple functional components (solubilized starch as carrier, insoluble granules for reinforcement, and water-resistant additives) into a single integrated adhesive composition system based on legume starch, achieving water resistance without requiring multiple separate amylaceous materials
Solution Approach 2:
The invention creates a composite adhesive composition containing solubilized legume starch, insoluble legume starch granules, and water-resistant additives (such as zinc sulphate or formaldehyde-free resins), forming a multi-functional material that provides both adhesion and water resistance
2Reliability
If formaldehyde resins are used to ensure water resistance, then water resistance is improved, but harmful factors to health and environment increase
Solution Approach 1:
The patent replaces harmful formaldehyde-based water-resistant additives with alternative substances such as zinc sulphate or formaldehyde-free synthetic resins, eliminating toxic emissions while maintaining water resistance functionality
Solution Approach 2:
The invention uses readily available, cost-effective legume starch (such as pea starch) as the base material, which is easily accessible and economical, replacing more expensive or problematic conventional starch sources
3Manufacturing precision
If adhesive compositions are optimized for high rheology to meet modern equipment demands, then manufacturing precision is improved, but ease of operation decreases
Solution Approach 1:
The patent optimizes the rheological properties of the adhesive by controlling the ratio between solubilized starch (carrier) and insoluble granules, adjusting viscosity and flow characteristics to match modern high-speed equipment requirements while maintaining ease of application
Solution Approach 2:
The adhesive composition exhibits dynamic rheological behavior where the solubilized starch provides flowability during application, while the insoluble granules provide structural integrity and adhesion strength during the bonding process
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 compositions achieve improved rheological properties, tack, and adhesive bonding quality, meeting the demands of modern equipment and ensuring water resistance without harming the environment or human health, using a single, readily available, and cost-effective amylaceous material.
Implementation Method 1
comprising a part of solubilized starch, referred to as carrier or primary part, exhibiting satisfactory suspending properties, in particular with respect to granular starch
Implementation Method 2
a part of non solubilized and/or only hydrated starch, i.e. which is in the form of insoluble granules and/or of at least partially swollen granules
Data Source
AI summary
An adhesive composition includes an aqueous dispersion having a primary part, consisting essentially of a gelatinized starch, and a secondary part, comprising essentially a non-gelatinized starch and/or a swollen starch, wherein the starch of the secondary part is a native legume starch, and the starch of the primary part is optionally a native or modified legume starch, the legume starches having an amylose content ranging between 30 and 52%. The invention also concerns the method for preparing such a composition, comprising its use, assembling the parts and drying and satisfying the requirements of modern fast machinery.