Water-Decaying Coating Paper for Returnable Container Labels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current coating papers for returnable containers face challenges in easy removal and efficient printing, as they either require complex washing processes or high manufacturing costs due to the use of expensive organic solvents, and often fail to provide adequate decaying features when exposed to water.
Innovation Solution
A coating paper is developed with a substrate containing 5-100 wt% water-insoluble fibrous carboxy alkyl cellulose and an alkalizing agent, which forms a water-soluble fibrous carboxy alkyl cellulose when contacted with water, allowing for easy removal and excellent printing aptitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a water-soluble adhesive is used to improve label removal, then the removing ability is improved, but the coating layer and substrate paper prevent water from entering the adhesive layer
Solution Approach 1:
The invention changes the chemical composition parameters of the substrate paper by incorporating water-soluble cellulose derivatives (carboxymethyl cellulose, hydroxyethyl cellulose, or hydroxypropyl cellulose) in specific amounts (5-100 wt%, preferably 20-80 wt%). This parameter change allows the substrate to become water-soluble, enabling water to penetrate through the coating layer and adhesive layer for easy label removal while maintaining printing quality.
2Ease of operation
If water-soluble paper is used as substrate, then label removal is improved, but the paper swells excessively and breaks in coating machine
Solution Approach 1:
The invention applies local quality by creating a multi-layer substrate structure where different regions have different water-solubility characteristics. The substrate contains water-soluble cellulose derivatives mixed with conventional paper fibers, creating zones with varying solubility that allow controlled water penetration for label removal while maintaining overall structural strength during coating operations.
Solution Approach 2:
The invention uses composite materials by combining water-soluble cellulose derivatives (carboxymethyl cellulose, hydroxyethyl cellulose, or hydroxypropyl cellulose) with conventional paper fibers in a laminated or mixed structure. This composite approach provides both water-solubility for label removal and sufficient mechanical strength to prevent breaking during coating machine operation.
3Manufacturing precision
If conventional coating paper is used, then printing quality is maintained, but complicated washing work is necessary for label removal
Solution Approach 1:
The invention changes the chemical composition parameters of the substrate paper by incorporating water-soluble cellulose derivatives (carboxymethyl cellulose, hydroxyethyl cellulose, or hydroxypropyl cellulose) in specific amounts (5-100 wt%, preferably 20-80 wt%). This parameter change allows the substrate to become water-soluble, enabling water to penetrate through the coating layer and adhesive layer for easy label removal while maintaining printing quality.
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 coating paper can be easily removed, dispersed, and dissolved in water, making it suitable for returnable containers while maintaining excellent printing properties and reducing manufacturing costs.
Implementation Method 1
a substrate containing 5-100 wt% water-insoluble fibrous carboxy alkyl cellulose and an alkalizing agent, which forms a water-soluble fibrous carboxy alkyl cellulose when contacted with water
Data Source
AI summary
A coating paper which can be removed by water comprising a substrate paper of single layer or lamellar structure having two or more layers which has at least one water decaying layer containing 5-100 wt % of water insoluble fibrous carboxy alkyl cellulose and a water base color is coated on said substrate paper, wherein a coating layer and at least a part of substrate paper which is a supporter of said coating layer has a characteristic of easily removing, dispersion and dissolving by contact with water, and can provide a water decaying coating paper used preferably for an use of label for a returnable container which may easily remove by contact with water and excellent in printing aptitude and a method for preparation thereof can be provided.