Liquid Paper Glue Composition Suppressing Wrinkles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid glues for paper often cause wrinkles during the bonding process, which limits their versatility and effectiveness.
Innovation Solution
A liquid glue composition with a solid content of 35 to 70 wt% primarily consisting of water-soluble modified polysaccharides and low-molecular saccharides, with a viscosity of 500 to 10,000 mPa/s, designed to minimize wrinkle formation while maintaining adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If liquid glue composed of viscous aqueous solutions of polyvinyl alcohol (PVA) is used, then adhesion strength is improved, but wrinkle formation occurs
Solution Approach 1:
The patent changes the chemical composition parameters by replacing PVA with water-soluble modified polysaccharides (such as hydroxypropyl starch, carboxymethyl starch) and adjusting the solid content concentration to 35-70 wt%, which fundamentally alters the glue's bonding mechanism to eliminate wrinkle formation while maintaining adhesion strength
Solution Approach 2:
The patent creates a composite glue system combining water-soluble modified polysaccharides with specific amounts of low-molecular-weight saccharides (0.7-8 times the amount of polysaccharide), forming a synergistic composition that achieves both wrinkle-free bonding and strong adhesion through the complementary properties of the components
2Reliability
If liquid glue is applied to achieve stronger adhesion, then bonding strength is improved, but wrinkle formation increases
Solution Approach 1:
The patent optimizes the solid content concentration parameter to 35-70 wt% and adjusts the viscosity to 500-10,000 mPa/s, creating the optimal physical state for the glue to penetrate paper fibers effectively without forming wrinkles, while maintaining reliable bonding strength
3Ease of operation
If conventional liquid glue composition is used, then ease of application is improved, but wrinkle-free property deteriorates
Solution Approach 1:
The patent optimizes the viscosity parameter to 500-10,000 mPa/s, which provides the optimal balance for ease of application - the glue flows smoothly for quick application while the controlled viscosity prevents excessive spreading and wrinkle formation 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 liquid glue achieves appropriate viscosity and adhesive strength while effectively suppressing wrinkle formation, making it suitable for diverse paper bonding applications.
Implementation Method 1
a liquid glue, which is used for bonding together sheets of office paper such as printer paper, office envelopes or the like
Implementation Method 2
water-soluble modified polysaccharides (encompassing water-soluble starch derivatives, cellulose derivatives, and dextrins) and low-molecular saccharides
Implementation Method 3
The water-soluble modified polysaccharide is a compound species with a molecular weight of at least 800 or over 1000, preferably 2000 or more or 3000 or more, which is generally adoptable as a 'thickener' (viscosity improver)
Data Source
AI summary
Problem: It is to provide a liquid glue for paper, which is able to meet more diverse usages and needs, by using ingredients and compositions different from conventional ones, and to especially provide a liquid glue that hardly causes wrinkles in paper sheets.Solution: In a preferred embodiment, the solid content (nonvolatile content) excluding water is 40 to 70% by weight; and the solid content part is substantially composed of a water-soluble modified polysaccharide and a low molecular weight saccharide; weight ratio of low molecular saccharide to modified polysaccharide (weight of low molecular saccharide÷weight of modified polysaccharide) is from 0.4 to 12; and viscosity (BL type viscometer, 6 rpm) of the liquid glue is 700 to 8000 mPa/s. In particularly preferred embodiments, the water-soluble modified polysaccharide is a hydroxyalkylated starch, other modified starch, or dextrin; and the low molecular weight saccharide is a monosaccharide or disaccharides, such as sucrose, fructose, glucose, xylose, maltose, trehalose or the like, xylitol, sorbitol or oligosaccharides.