Sheet Binding via Low Surface Tension Liquid Application
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Solution Overview
Problem
Existing sheet binding technologies face challenges in maintaining binding force as the number of sheets increases, particularly with pressure-bonding methods that rely on concave and convex pressurizing teeth, which struggle to mesh effectively and weaken binding force with larger sheet bundles.
Innovation Solution
A sheet processing apparatus applies a liquid with a surface tension lower than water to the outermost sheet of a bundle, using a pair of pressurizing teeth to clamp and pressurize the bundle, ensuring the liquid application region overlaps with the pressurizing region, thereby enhancing binding force without staples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressure-bonding binding is performed without adding water, then the binding process is simple and quick, but the binding force weakens when the number of sheets increases
Solution Approach 1:
The patent changes the physical-chemical parameters of the liquid by using a liquid with lower surface tension than water. This parameter change allows the liquid to penetrate sheets more quickly and effectively, enabling strong binding force even when binding large numbers of sheets, while maintaining the efficiency of the pressure-bonding process
2Strength
If water is added before pressure-bonding to increase binding force, then the binding force improves, but the time for liquid penetration and binding process increases
Solution Approach 1:
The patent applies a liquid with lower surface tension than water, which changes the penetration characteristics of the liquid. This parameter change reduces the time required for the liquid to penetrate into the sheets while still achieving the necessary binding force, thus resolving the time-strength trade-off
3Quantity of substance
If the number of sheets in the bundle increases, then more sheets can be bound in one operation, but the pressurizing teeth become difficult to mesh with each other
Solution Approach 1:
The patent uses a liquid with lower surface tension to enhance penetration and binding effectiveness. This allows reliable binding of larger sheet bundles where the pressurizing teeth may have difficulty meshing, as the liquid facilitates fiber tangling and binding even when complete tooth intermeshing is difficult to achieve
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
This approach allows for stronger binding of larger sheet bundles by facilitating quicker liquid penetration and improved fiber tangling, maintaining binding force even with multiple sheets, while avoiding the need for metal staples.
Implementation Method 1
the application unit applies the liquid to an outermost sheet of the sheet bundle, and a static surface tension of the liquid is lower than a static surface tension of water
Data Source
AI summary
A sheet processing apparatus for performing binding processing for a sheet bundle formed from a plurality of sheets, comprises: an application unit configured to apply a liquid to a sheet wherein the application unit applies the liquid to an outermost sheet of the sheet bundle, and a static surface tension of the liquid is lower than a static surface tension of water; and a binding processing unit configured to bind the sheet bundle, without using a staple, wherein the binding processing unit includes a pair of groups of pressurizing teeth, and the pressurizing teeth clamp and pressurize the sheet bundle. In the sheet bundle, a liquid application region which is applied with the liquid and a pressurizing region which is pressurized by the pressurizing teeth are provided to overlap each other.