Compostable Photographic Paper Carrier Using Biodegradable Polymer
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Solution Overview
Problem
Existing photographic paper substrates with polymer layers offer high light stability and durability but are not recyclable, leading to material loss and high recycling costs, while biodegradable alternatives lack sufficient light stability and durability.
Innovation Solution
A compostable carrier material for photographic papers comprising a paper layer and a biodegradable polymer layer, utilizing biodegradable polymers like polylactic acid and fillers such as calcium carbonate, which are compostable and maintain high light stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synthetic polyolefins like polyethylene are used as polymer layers, then high light stability and long-term durability are achieved, but recyclability is lost and materials cannot be composted
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer layer by using biodegradable polymers (polylactic acid, polyhydroxyalkanoates, cellulose acetate, starch) instead of conventional synthetic polyolefins. This parameter change enables the material to be compostable while maintaining sufficient light stability for photographic applications, resolving the contradiction between durability and recyclability.
Solution Approach 2:
The patent creates a composite carrier material combining paper base with biodegradable polymer layers. This composite structure achieves both the desired light stability (through the polymer layer) and compostability (through the biodegradable nature of both paper and polymer components), allowing the entire composite to be recyclable and compostable.
2Ease of manufacture
If biodegradable polymers like polylactic acid are used, then recyclability and compostability are improved, but light stability and durability deteriorate due to UV sensitivity and rapid oxidation
Solution Approach 1:
The patent introduces UV stabilizers and antioxidants as intermediary substances within the biodegradable polymer layer. These additives act as mediators that protect the biodegradable polymer from UV radiation and oxidation, preventing rapid degradation while maintaining the material's compostable nature. This resolves the contradiction by enabling biodegradable polymers to achieve sufficient light stability.
Solution Approach 2:
The patent modifies the chemical composition of the biodegradable polymer layer by incorporating stabilizing agents and adjusting polymer ratios. These parameter changes enhance the light stability and durability of biodegradable polymers, making them suitable for photographic applications while preserving their compostable characteristics.
3Device complexity
If conventional application equipment is used for biodegradable polymers, then manufacturing simplicity is maintained, but processing challenges arise due to material sensitivity
Solution Approach 1:
The patent adjusts processing parameters such as application temperature, drying conditions, and coating speed to match the sensitivity of biodegradable polymers. By optimizing these parameters, the patent enables successful processing on conventional equipment without compromising material stability, resolving the contradiction between equipment simplicity and material reliability.
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 provides a recyclable and compostable carrier material with comparable light resistance to non-compostable alternatives, meeting industrial compostability standards and ensuring long service life.
Implementation Method 1
under the influence of UV radiation and visible light, an aliphatic polyester, such as polylactic acid, can rapidly oxidize and lose its color and transparency
Implementation Method 2
compostable within the meaning of the invention means that the carrier material is compostable according to DIN EN 13432
Data Source
AI summary
The invention relates to a compostable carrier material for photographic paper, comprising a paper layer and a biodegradable polymer layer on at least one side of the paper layer. The invention further relates to a photographic paper comprising a compostable carrier material according to the invention. The invention further relates to the use of the compostable carrier material according to the invention in a photographic paper according to the invention and to a process for producing a compostable carrier material according to the invention, comprising the following steps: (a) providing a paper layer; (b) coating the paper layer on at least one side with a biodegradable polymer layer; (c) optionally coating the biodegradable polymer layer with an adhesive layer; (d) coating the biodegradable polymer layer applied in step (b) or the adhesive layer applied in optional step (c) with an image-receiving layer.