Contamination Inhibitor Composition for Paper Machine Dry Part
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Solution Overview
Problem
Existing contamination inhibitor compositions for paper-making machines are insufficient in inhibiting pitch contamination on the downstream side of the dry part, as the low molecular polysiloxane compound tends to penetrate into the wet paper, leading to inadequate re-transfer and incomplete coverage.
Innovation Solution
A contamination inhibitor composition containing a film-forming agent and a gelling agent, such as gluconic acid, malic acid, or citric acid, which forms an intermolecular hydrogen bond, preventing penetration into the wet paper and ensuring effective re-transfer and broader coverage across the dry part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a low molecular polysiloxane compound is used as a contamination inhibitor composition, then the composition can be transferred to wet paper and conveyed downstream, but the compound penetrates into the wet paper and cannot be re-transferred effectively to the dry part
Solution Approach 1:
The patent combines low molecular polysiloxane compound (for transferability) with high molecular polysiloxane compound (for film formation and re-transfer capability) to create a composite contamination inhibitor composition. This composite approach allows the low molecular component to be conveyed downstream while the high molecular component ensures effective re-transfer to downstream dry parts, resolving the contradiction between coverage range and re-transfer efficiency.
2Reliability
If a high molecular polysiloxane compound is used to form a film on the dry part, then pitch contamination can be inhibited at the application site, but the region of inhibition is limited to where the composition is imparted
Solution Approach 1:
The patent merges the functions of high molecular polysiloxane (film formation and contamination inhibition) with low molecular polysiloxane (transfer and conveyance) in a single composition system. This merging allows the inhibitor to be applied at one location, conveyed downstream via wet paper, and re-transferred to downstream dry parts, thereby expanding the inhibition region while maintaining effectiveness.
Solution Approach 2:
The wet paper acts as an intermediary carrier that transports the low molecular polysiloxane compound from the upstream dry part to downstream dry parts. This intermediary mechanism enables the contamination inhibitor to reach and protect downstream areas without requiring direct application at each location, thus expanding the inhibited region.
3Area of stationary object
If multiple positions on the dry part are treated with contamination inhibitor composition, then comprehensive coverage can be achieved, but the complexity of application increases
Solution Approach 1:
The contamination inhibitor composition performs self-service by being automatically conveyed downstream through the wet paper and re-transferred to downstream dry parts. This self-conveyance mechanism eliminates the need for manual application at multiple positions, reducing application complexity while achieving comprehensive coverage through the composition's own transport and re-transfer capabilities.
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 gelling agent prevents the inhibitor from penetrating into the wet paper, allowing it to be re-transferred to the downstream dry part, effectively inhibiting pitch contamination over a wider range while maintaining preservation stability.
Implementation Method 1
a gelling agent having a prescribed structure, prevents penetration into the wet paper by forming an intermolecular hydrogen bond
Data Source
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AI summary
To provide a contamination inhibitor composition capable of effectively inhibiting pitch contamination on a dry part. The present invention is a contamination inhibitor composition 1 which is imparted to a dry part D of a paper-making machine, and comprising a film forming agent and a gelling agent, wherein the film forming agent is an emulsion consisting of water, a modified silicone and an emulsifier and the gelling agent is a compound represented by the following formula (1): [in the formula (1), R1 each independently represents a hydrogen atom, a hydroxyl group, a carboxyl group or a hydrocarbon group optionally having a substituent having 1 to 3 carbon atoms, R2 each independently represents a hydroxyl group or a carboxyl group, R3 represents a hydrogen atom, a hydroxyl group or a carboxyl group, m is an integer of 1 to 5, and n is an integer of 0 to 5.].