Acrylic-Coated Printing Sheet for Adhesion and Antistatic Control
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Solution Overview
Problem
Conventional printing sheets face issues with poor adhesion between the substrate and coating layer, low water resistance, weather resistance, and high surface resistivity leading to static electricity and paper jams during printing, particularly in low humidity conditions.
Innovation Solution
A printing sheet with a coating layer containing a predetermined amount of clay and light calcium carbonate in the acrylic polymer emulsion, enhancing adhesion, water resistance, and antistatic properties while maintaining whiteness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If clay latex is applied to form a coating layer, then adhesion force between ink and plastic sheet is improved, but whiteness of the printing sheet decreases and yellowing occurs due to ultraviolet deterioration
Solution Approach 1:
The patent uses a composite coating layer containing both clay particles and titanium dioxide particles dispersed in an acrylic polymer matrix. The titanium dioxide (white pigment) compensates for the yellowing effect of clay, maintaining whiteness while the clay provides adhesion. This composite approach resolves the contradiction between improving adhesion and maintaining whiteness/weather resistance.
2Reliability
If hydrophilic acrylic polymer material is added to exhibit antistatic effect, then antistatic property is improved under high humidity, but antistatic effect becomes low under low humidity conditions such as in winter
Solution Approach 1:
The patent changes the surface resistivity parameter by adding clay particles to the coating layer. Clay has high dielectric constant and conductive properties that reduce surface resistivity regardless of humidity conditions. This parameter change makes the antistatic effect less dependent on environmental humidity, resolving the contradiction between achieving antistatic effect and reducing environmental dependence.
3Ease of manufacture
If acrylic polymer coating is applied alone, then application process is simple, but fixability with toner is low requiring high temperature fixing that melts the sheet
Solution Approach 1:
The patent creates a composite coating layer with clay and titanium dioxide particles in acrylic polymer. The clay particles provide sites for toner adhesion and the composite structure enables low-temperature fixing. This composite approach maintains application simplicity while reducing fixing temperature requirements, resolving the contradiction between ease of manufacture and temperature control.
4Ease of manufacture
If conventional acrylic polymer coating is used, then coating formation is straightforward, but adhesion force between plastic sheet and coating liquid is weak causing peeling
Solution Approach 1:
The patent applies local quality by adding clay particles specifically to the coating layer formulation. The clay particles create a rougher surface topology and provide polar sites that locally enhance adhesion between the coating and the plastic substrate. This localized modification maintains straightforward coating formation while improving adhesion force to prevent peeling.
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 sheet exhibits improved printability, adhesiveness, antistatic performance, and resistance to water and weather, reducing paper jams and maintaining whiteness, suitable for various printing methods including offset printing.
Implementation Method 1
a coating layer containing clay in a proportion of 35% by mass or more and 65% by mass or less and light calcium carbonate in a proportion of 5% by mass or more and 30% by mass or less in a continuous phase of an acrylic polymer
Implementation Method 2
improved antistatic performance due to lowering the surface resistivity
Implementation Method 3
a coating layer containing clay in a proportion of 35% by mass or more and 65% by mass or less and light calcium carbonate in a proportion of 5% by mass or more and 30% by mass or less in a continuous phase of an acrylic polymer
Data Source
AI summary
Provided are a printing sheet that has excellent printability, excellent adhesiveness between a substrate and a coating layer, and excellent antistatic performance and thus is less likely to cause troubles such as paper jams during printing, and further has excellent properties such as water resistance and weather resistance in the printing sheet having the coating layer for receiving an ink on at least one surface of the substrate and a method for producing the same. The printing sheet includes the coating layer by blending clay in a proportion of 35% by mass or more and 65% by mass or less and light calcium carbonate in a proportion of 5% by mass or more and 30% by mass or less in a continuous phase made of an acrylic polymer.