SiOx Edge Coating for Low-Stick Adhesive Tape Rolls
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Solution Overview
Problem
Adhesive tape rolls, particularly those with foamed acrylate-based adhesives, experience significant stickiness issues at the side edges, leading to contamination and mechanical challenges during processing and storage, with existing solutions either compromising optical properties, requiring complex processes, or offering only partial adhesion reduction.
Innovation Solution
Applying a SiOx coating using an atmospheric pressure plasma stream enriched with polyfunctional silanes directly onto the winding mirror of the adhesive tape roll, ensuring a uniform and effective reduction in adhesive tackiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pressure powder coating (talc or glass beads) is applied to the side edge, then adhesive strength is reduced, but optical properties are compromised and contamination occurs
Solution Approach 1:
The patent replaces permanent particle coatings (talc/glass beads) with a thin organic coating that decomposes or can be removed. The organic substance forms a temporary protective layer that reduces adhesion without leaving permanent contamination, addressing both the adhesion reduction need and the contamination problem.
Solution Approach 2:
The patent changes the chemical composition and physical state of the coating material from inorganic particles to organic substances. This parameter change allows the coating to be applied as a uniform thin layer that reduces adhesion through molecular interactions rather than physical particle barriers, preserving optical properties.
2Strength
If conventional varnish is applied to the side edge, then adhesive strength is reduced, but drying time is very long and roll forces increase
Solution Approach 1:
The patent utilizes phase transition from liquid to gas (evaporation) of low molecular weight organic compounds to achieve rapid coating formation. The organic substance is applied in a state that allows quick phase transition, eliminating long drying times while forming an effective anti-adhesive layer.
Solution Approach 2:
The patent replaces the mechanical drying process (evaporation of water-based varnish) with a chemical/physical process involving low molecular weight organic compounds that transition rapidly from liquid to vapor state, substituting a slow thermal-mechanical process with a faster phase transition mechanism.
3Strength
If crosslinking or degradation of pressure-sensitive adhesive is achieved through UV, IR, electron beam, gamma irradiation, or plasma treatment, then adhesive strength is reduced, but the process setup is complicated and complex
Solution Approach 1:
The patent extracts the anti-adhesive function from complex radiation or plasma treatment systems and implements it through a simple organic coating application. The active ingredient is separated and applied directly, eliminating the need for complex irradiation equipment while achieving the same adhesion reduction effect.
Solution Approach 2:
The patent introduces an organic substance as an intermediary that mediates the anti-adhesive effect without requiring direct application of complex energy fields. The organic compound acts as a mediator between the substrate and the adhesion reduction goal, simplifying the overall process setup.
4Object-affected harmful factors
If side panels are used to prevent stickiness, then contamination is prevented, but work effort increases due to cutting, removal, and repositioning
Solution Approach 1:
The patent makes the adhesive tape roll self-sufficient by applying the anti-adhesive coating directly to it. The roll protects itself against contamination and stickiness without requiring external side panels or manual intervention, eliminating the need for cutting, removal, and repositioning operations.
Solution Approach 2:
The patent merges the anti-adhesive function with the adhesive tape roll itself by applying the coating directly to the roll surface. This combines the protective function with the product, eliminating the need for separate side panels and reducing operational complexity.
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 SiOx coating significantly reduces the adhesive tackiness of the adhesive tape roll, preventing contamination and simplifying handling by ensuring the tape does not stick to other objects, while maintaining optical properties and providing long-term stability.
Implementation Method 1
a precursor containing organic polyfunctional silanes is fed into an atmospheric-pressure plasma stream. The plasma stream enriched with the precursor is directed onto a wound mirror, and the wound mirror is coated with a SiOx coating
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a method for reducing the edge stickiness at the roll level of an adhesive tape roll (21). According to this method, a precursor (4) comprising organic polyfunctional silanes is added to a plasma stream, the plasma stream containing the precursor (4) is directed onto the edge (20) at the roll level and the edge at the roll level (20) is coated with an SiOx coating.