Base Paper for Eco-Friendly Paper Cups
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Solution Overview
Problem
Conventional base papers for eco-friendly paper cups face challenges in achieving recyclability, biodegradability, water resistance, oil resistance, heat sealability, and block resistance simultaneously, leading to issues in manufacturing, recycling, and environmental sustainability.
Innovation Solution
A double-coating layer system is applied to the base paper, comprising a first coating layer with a resin having a low glass transition temperature for heat sealability and a second coating layer with a resin having a high glass transition temperature for block resistance, along with defoamers, silica, and a wetting agent to enhance performance and prevent sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a base paper is coated with polyethylene (PE) to ensure water resistance and heat sealability, then the paper cup manufacturing process is optimized, but the recyclability and biodegradability are compromised due to the non-degradable nature of PE
Solution Approach 1:
The patent changes the chemical composition parameters of the coating material from conventional polyethylene to a specific copolymer composition (acrylic-based monomer 40-70 wt%, carboxylic acid-based monomer 30-60 wt%) that enables both water resistance and biodegradability. This parameter change allows the coating to maintain functional performance while being environmentally degradable and recyclable with the pulp.
Solution Approach 2:
The patent uses a composite coating material formed by copolymerization of acrylic-based and carboxylic acid-based monomers, creating a material that combines the water resistance properties of acrylic polymers with the adhesion and sealability properties of carboxylic acid-based polymers. This composite material achieves multiple functions (water resistance, heat sealability, biodegradability) that single materials cannot provide.
2Object-generated harmful factors
If the base paper focuses on recyclability and biodegradability without proper coating, then environmental friendliness is improved, but water resistance and workability deteriorate
Solution Approach 1:
The patent optimizes the coating amount parameter to 5-20 g/m², which is sufficient to provide water resistance and heat sealability while remaining thin enough to allow biodegradation and pulp recovery. This precise parameter control ensures that the coating provides necessary protection without compromising environmental friendliness or recyclability.
Solution Approach 2:
The patent employs a coating layer with controlled porosity and thickness that allows water vapor transmission and biological degradation while maintaining liquid water resistance. The porous structure enables oxygen and moisture penetration for biodegradation but provides sufficient barrier properties for water resistance during use.
3Device complexity
If a single coating layer is applied to achieve heat sealability, then the manufacturing process is simplified, but block resistance deteriorates causing sticking between stacked cups
Solution Approach 1:
The patent adjusts the glass transition temperature (Tg) parameter of the copolymer coating to a specific range (0-50°C) by controlling the monomer composition ratios. This Tg optimization enables the coating to provide adequate block resistance at storage temperatures while maintaining heat sealability at processing temperatures, eliminating the need for additional anti-sticking layers.
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 enables the production of eco-friendly paper cups with excellent heat sealability, water resistance, and block resistance, facilitating recycling and biodegradability, while maintaining cost-effectiveness and preventing sticking during manufacturing.
Implementation Method 1
a first coating layer formed of a first coating liquid applied onto the basic paper; and a second coating layer formed of a second coating liquid applied onto the first coating layer, wherein the base paper for eco-friendly paper cups has heat sealability and block resistance
Implementation Method 2
a first coating layer formed of a first coating liquid applied onto the basic paper; and a second coating layer formed of a second coating liquid applied onto the first coating layer, wherein the base paper for eco-friendly paper cups has heat sealability and block resistance
Data Source
AI summary
Disclosed is a base paper for eco-friendly paper cups and, more specifically, to a base paper for eco-friendly paper cups, which is eco-friendly by having recyclability and biodegradability while retaining water resistance, oil resistance, heat sealability, and block resistance required as a base paper for paper cups.