Polylactic Acid Cap Layer Paper with Filler Substrate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The use of polylactic acid in paper products is limited due to cost disadvantages and higher density compared to petroleum-based materials, making it less adoptable for applications where liquid resistance and biodegradability are required.
Innovation Solution
Incorporating a filler layer with a filler material in combination with polylactic acid based resin in paper products, where the cap layer is substantially free of filler material, reduces the amount of polylactic acid needed and enhances barrier sealing, heat sealing, and staining properties while maintaining biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polylactic acid is used in paper products to provide biodegradability and liquid resistance, then environmental sustainability and barrier properties are improved, but cost and material density increase
Solution Approach 1:
The patent applies composite materials by combining polylactic acid with natural fiber fillers (such as cellulose, wood fiber, or plant-based fibers) to create a cost-effective paper product that maintains biodegradability and liquid resistance. This composite approach reduces reliance on expensive pure polylactic acid while preserving the desired functional properties.
Solution Approach 2:
The patent applies local quality by using polylactic acid specifically in the coating layer where liquid resistance is most needed, while using cheaper natural fiber fillers in the bulk paper structure. This localized application of polylactic acid optimizes cost-performance by concentrating the expensive material only where its barrier properties are most valuable.
2Reliability
If polylactic acid is used to provide biodegradability, then environmental sustainability is improved, but material density and cost per pound increase
Solution Approach 1:
The patent combines polylactic acid with low-density natural fiber fillers to reduce the overall density of the paper product. This composite structure allows the paper to remain lightweight and biodegradable while reducing the quantity of expensive polylactic acid needed per pound of final product.
Solution Approach 2:
The patent segments the paper product into distinct functional layers: a bulk paper structure made from inexpensive natural fibers providing volume and biodegradability, and a thinner polylactic acid coating layer providing liquid resistance. This segmentation reduces the total amount of polylactic acid required while maintaining the desired biodegradable properties.
3Ease of manufacture
If filler material is added to the cap layer to reduce cost, then material cost decreases, but barrier sealing and heat sealing properties deteriorate
Solution Approach 1:
The patent applies local quality by restricting filler material addition to the bulk paper layers while keeping the cap layer free of fillers. This ensures the cap layer maintains its purity, density, and sealing properties necessary for barrier and heat sealing functions, while fillers are used where they primarily add cost reduction benefits.
Data Source
AI summary
A paper product includes a paperboard comprising a substrate layer, a filler layer, and a cap layer, wherein the filler layer is disposed between the substrate layer and the cap layer, wherein the filler layer includes a filler material, wherein the cap layer includes a polylactic acid based resin, and wherein the cap layer is substantially free of filler material.