Electrostatic Adsorbable Sheet Humidity Resistance
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Solution Overview
Problem
Conventional electrostatic adsorbable sheets suffer from low electrostatic adsorbability, humidity-induced durability issues, and poor ink adhesiveness, making them inconvenient for use as print materials and prone to printing problems.
Innovation Solution
A laminate electrostatic adsorbable sheet comprising a label layer with a resin film and a recording layer, laminated with a peelable sheet layer, where the layers are electrically charged through a corona discharge treatment, and contain inorganic fine powders and polyolefin resins with functional groups to enhance charge retention and ink adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a porous film structure is used to increase chargeable surface area, then the ability to hold electrified charges is enhanced, but the film has high moisture permeability and interconnected pores causing charge-retaining ability to vary with external humidity
Solution Approach 1:
The patent employs a porous film structure to maximize the chargeable surface area, allowing greater charge storage capacity. The porous architecture provides numerous interfaces for charge accumulation while maintaining structural integrity.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the porous structure, including pore size distribution, porosity percentage, and surface area-to-volume ratio, to optimize both charge storage capacity and humidity resistance. By carefully controlling these parameters, the film achieves high charge retention while minimizing moisture permeability effects.
2Reliability
If a film with high unipolar charge is used to achieve high and long-lasting electrostatic adsorbability, then the film may stick to rolls and cause pattern misalignment during printing, or catch dust and contaminants
Solution Approach 1:
The patent applies electrostatic charge non-uniformly across the film surface, creating regions of varying charge density. This localized charging approach ensures sufficient adsorbability in critical areas while maintaining lower charge levels in regions that contact printing machinery, preventing sticking and operational issues.
Solution Approach 2:
The patent applies a controlled amount of electrostatic charge that is sufficient for achieving the required adsorbability but deliberately limits the total charge to prevent excessive electrostatic effects during printing operations. This partial charging strategy balances functional requirements with operational compatibility.
3Reliability
If the film is given a unipolar charge before printing to achieve electrostatic adsorbability, then the process becomes complicated and inconvenient for use as printing paper
Solution Approach 1:
The patent incorporates electrostatic charge generation capabilities directly into the film structure during manufacturing, so that the film is pre-equipped with charge retention functionality. This preliminary integration eliminates the need for separate charging steps before printing, simplifying the overall process.
Solution Approach 2:
The patent designs the film with self-charging or self-maintaining properties, where the material itself generates or preserves electrostatic charge without requiring external charging equipment or processes. This self-service approach makes the film ready for immediate use as printing paper without additional complexity.
4Ease of operation
If conventional electrostatic adsorbable films are used, then they can attach to objects without adhesive agents, but the durability of adsorbability is insufficient and paste may remain after peeling
Solution Approach 1:
The patent combines porous film material with electrostatic charge retention components to create a composite structure. This composite material integrates the advantages of porous architecture for charge storage with materials specifically selected for enhanced charge retention and durability, achieving long-lasting adsorbability without adhesive agents.
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 provides a sheet with long-lasting electrostatic adsorbability that is not affected by humidity, ensures good ink adhesiveness, and minimizes printing process disruptions, enabling stable and effective attachment and removal without surface damage.
Implementation Method 1
the laminate in which the label layer (i) and the peelable sheet layer (ii) are laminated is subjected to an electrically charging treatment to introduce charges into the label layer (i)
Implementation Method 2
the label layer (i) peeled from the peelable sheet layer (ii) is electrostatically adsorbable to an object to be attached
Data Source
Figure 1~2
Figure 3
AI summary
An electrostatic adsorbable sheet (iii), which has a long-lasting adsorbability not easily affected by humidity, secures good ink adhesiveness, and does not generate troubles in a printing process, is provided. The electrostatic adsorbable sheet (iii) comprises a laminate of a label layer (i) containing a resin film layer (A) and a recording layer (D) on one surface of the resin film layer (A), and a peelable sheet layer (ii) containing a peelable layer (B) and a support layer (C), in which the label layer (i) and the peelable sheet layer (ii) are laminated so that the resin film layer (A) and the peelable layer (B) contact with each other, wherein the peeling strength between the label layer (i) and the peelable sheet layer (ii) is from 1 to 50 g/cm, and the label layer (i) peeled from the peelable sheet layer (ii) is electrostatically adsorbable to an object to be attached.