Creped Tissue Web Composition for Soft High-Basis-Weight Sheets
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional creping chemistries struggle to produce a soft, yet thick and absorbent tissue web at higher basis weights, as increased basis weight leads to stiffness and reduces softness, and makes it difficult to achieve a fine crepe structure.
Innovation Solution
A creping composition comprising a non-fibrous olefin polymer, such as an ethylene and octene copolymer, is applied to the tissue web, forming a discontinuous film or discrete treated areas, which maintains a fine crepe structure and softness even at basis weights greater than 16 gsm, by reducing internal bonding and increasing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the basis weight of the tissue is increased to achieve thickness and absorbency, then the tissue becomes thicker and more absorbent, but the tissue stiffness increases and softness is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the creping adhesive, specifically using a non-fibrous olefin polymer with controlled molecular weight and composition ratios. This parameter change enables the adhesive to function effectively at higher basis weights (greater than 16 gsm) while maintaining fine crepe structure and softness, resolving the contradiction between thickness and softness
Solution Approach 2:
The patent employs a composite creping adhesive system comprising a non-fibrous olefin polymer (such as ethylene-octene copolymer) combined with specific additives and formulated at optimized concentrations. This composite material approach allows the adhesive to provide both structural support for high basis weight and the softness required for comfortable tissue handling
2Quantity of substance
If the basis weight of the tissue is increased to achieve thickness and absorbency, then the tissue becomes thicker and more absorbent, but the creping process becomes more difficult and fine crepe structure is reduced
Solution Approach 1:
The patent modifies the creping adhesive parameters, specifically using a non-fibrous olefin polymer with controlled molecular weight distribution and composition. This parameter adjustment enables the adhesive to maintain its bonding and creping effectiveness at higher basis weights (greater than 16 gsm), preserving fine crepe structure despite the increased tissue weight
Solution Approach 2:
The non-fibrous olefin polymer acts as an intermediary substance that mediates between the high basis weight tissue substrate and the creping process requirements. The adhesive formulation serves as a mediator that enables fine crepe structure formation even when the tissue weight exceeds conventional limits
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 results in tissue products with a basis weight of at least 16 gsm that are both strong and soft, with a fine crepe structure and low geometric mean tensile strength, achieving improved handfeel and softness without excessive stiffness.
Implementation Method 1
a creping composition comprising a non-fibrous olefin polymer disposed on at least the first side
Data Source
AI summary
In general, the present disclosure is directed to creped tissue webs, and products produced therefrom. The creped webs and products are strong, soft, and have fine crepe structure, such as less than about 12, measured as % COV at a STFI wavelength of 16 to 32 mm, using the test method set forth herein. Fine crepe structure is achieved even at basis weights in excess of 16 gsm per ply.