Creping Adhesive Formulation for Drum Release Control
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Solution Overview
Problem
Existing creping adhesives face challenges in maintaining the balance between adhesion and release on the paper web and the creping drum, requiring frequent adjustments with changes in wet end chemistry, temperature, or moisture levels, leading to issues like wrinkles and poor sheet quality.
Innovation Solution
A creping adhesive comprising a solvent, modified polyvinyl alcohol, and a crosslinked resin with polyamidoamine backbones crosslinked by primary and secondary crosslinking moieties, derived from functionally symmetric crosslinkers, which improves single phase stability, adhesion, and film thickness, providing a wider operational window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional creping adhesives are used, then adhesion to the drum surface is achieved, but the balance between adhesion and release is difficult to maintain, requiring frequent adjustments when wet end chemistry, temperature, or moisture levels change
Solution Approach 1:
The adhesive comprises a composite formulation combining modified polyvinyl alcohol (with carboxyl, sulfonate, or sulfate groups) and polyamidoamine crosslinked resins. This composite material provides both strong adhesion to the drum surface and controlled release properties, maintaining reliable performance across varying operational conditions without requiring frequent formulation adjustments.
Solution Approach 2:
The patent modifies the chemical parameters of the adhesive by incorporating polyvinyl alcohol with specific functional groups (carboxyl, sulfonate, sulfate) and crosslinking agents. These parameter changes enable the adhesive to maintain stable adhesion-release balance across a broader range of temperatures, moisture levels, and wet end chemistry conditions, effectively widening the operational window.
2Strength
If excessive adhesion is achieved, then the paper web adheres strongly to the drum, but the sheet quality deteriorates or the sheet breaks during creping
Solution Approach 1:
The adhesive formulation uses modified polyvinyl alcohol with specific functional groups and controlled crosslinking density to tune the adhesion strength parameter. This enables strong initial adhesion to the drum surface while maintaining controlled release characteristics, preventing sheet breakage and preserving sheet quality during the creping process.
Solution Approach 2:
The modified polyvinyl alcohol acts as an intermediary substance between the paper web and the drum surface. Its functional groups (carboxyl, sulfonate, sulfate) provide controlled interaction with both the paper fibers and the drum surface, enabling strong adhesion during drying while facilitating clean release during creping, thus maintaining sheet quality.
3Productivity
If inadequate adhesion is achieved, then the creping process cannot be performed effectively, but the drying time increases and operational speed must be reduced
Solution Approach 1:
The composite adhesive formulation combines modified polyvinyl alcohol with polyamidoamine crosslinked resins to achieve rapid adhesion at operational speeds. The functional groups in the polyvinyl alcohol provide immediate bonding capability, while the crosslinked resin structure ensures complete drying and effective creping, maintaining both productivity and creping effectiveness.
Solution Approach 2:
The adhesive is applied to the drum surface before the paper web arrives, establishing a pre-formed adhesive layer. This preliminary action ensures immediate adhesion upon contact, allowing the paper web to be quickly secured for drying and creping without delay, thus maintaining high operational speed while ensuring creping effectiveness.
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 creping adhesive achieves enhanced adhesion and reduced film solubility, allowing for better control over the creping process and improved paper quality with a broader range of operational conditions.
Implementation Method 1
The creping action can impart a fine, rippled texture to the sheet, increase the bulk of the sheet, and improve the softness and absorbency of the sheet. Creping can be accomplished by affixing the moist cellulosic paper web to a rotating heated drum (commonly known as a Yankee dryer) by applying the paper web onto the surface of the drum, which has been sprayed with a creping adhesive.
Implementation Method 2
The crosslinked resin can include polyamidoamine backbones crosslinked by primary crosslinking moieties and propanediyl moieties. The primary crosslinking moieties can be derived from a functionally symmetric crosslinker.
Implementation Method 3
The surface of the drum is sprayed with the creping adhesive while the paper web is applied and dried by hot air impinging on the exposed side of the paper web and conductive heat is transferred from the drum.
Implementation Method 4
The paper web is applied and dried by hot air impinging on the exposed side of the paper web and conductive heat is transferred from the drum. As the paper web dries, hydrogen bonds form between the fibers creating a flat and dense paper web morphology.
Implementation Method 5
The creping adhesive achieves enhanced adhesion and reduced film solubility, allowing for better control over the creping process and improved paper quality with a broader range of operational conditions.
Data Source
AI summary
Creping adhesives and processes for making and using same. In some embodiments, the creping adhesive can include a solvent, a modified polyvinyl alcohol, and a crosslinked resin. The crosslinked resin can include polyamidoamine backbones crosslinked by primary crosslinking moieties and propanediyl moieties, where the primary crosslinking moieties can be derived from a functionally symmetric crosslinker. In other embodiments, the crosslinked resin can include polyamidoamine backbones crosslinked by primary crosslinking moieties and secondary crosslinking moieties, where the primary crosslinking moieties can be derived from a first functionally symmetric crosslinker and the secondary crosslinking moieties can be derived from a second functionally symmetric crosslinker. In other embodiments, the crosslinked resin can include polyamidoamine backbones crosslinked by primary crosslinking moieties, where the primary crosslinking moieties can be derived from a functionally symmetric crosslinker. The modified polyvinyl alcohol can include a carboxylated, a sulfonated, a sulfated, and/or a sulfonated-carboxylated polyvinyl alcohol.