Flame Resistant Paper Preserving Smoothness Differential
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Solution Overview
Problem
Machine-glazed paper products face a challenge in maintaining differential smoothness and gloss after applying a flame retardant composition, which is undesirable for their intended applications.
Innovation Solution
A method is developed to apply a flame retardant composition only to the rougher side of a machine-glazed paper substrate, preserving the smoothness differential between the two sides by using a Yankee cylinder to create a smooth and rough surface, and then applying the composition during the size press process, ensuring the smooth side remains suitable for applications like finger painting and the rough side for watercolor painting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flame retardant composition is applied to machine-glazed paper, then flame resistance is improved, but the differential smoothness and gloss between the two sides deteriorates
Solution Approach 1:
The flame retardant composition is applied selectively only to the rougher side of the paper substrate, while the smoother side receives no treatment. This local application ensures that the smooth side maintains its original gloss and smoothness characteristics for artistic applications, while the rough side gains flame resistance. The selective application is achieved through the size press process where the composition is applied only to the side that will become the rough side after calendering.
2Reliability
If a flame retardant composition is applied to machine-glazed paper, then flame resistance is improved, but the gloss characteristics deteriorates
Solution Approach 1:
The flame retardant composition is applied selectively only to the rougher side of the paper substrate, while the smoother side receives no treatment. This local application ensures that the smooth side maintains its original gloss and smoothness characteristics for artistic applications, while the rough side gains flame resistance. The selective application is achieved through the size press process where the composition is applied only to the side that will become the rough side after calendering.
Data Source
AI summary
The invention relates to a flame resistant paper product and a method for manufacturing a flame resistant paper product. In an embodiment the invention is a paper product comprising a paper substrate having a first surface and a second surface and a flame retardant composition, wherein the first surface is smoother than the second surface. In another embodiment, the invention is a method for forming a flame resistant paper product comprising applying a flame retardant composition to a web of fibers having a first surface and a second surface, wherein the first surface is smoother than the second surface by at least about 70 SSU according to TAPPI T538.