Liquid Absorbing Sheet With Breakable Bonding Portion
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Solution Overview
Problem
Existing liquid absorbing sheets, such as those using superabsorbent polymers (SAP), face limitations in absorbing sufficient liquid due to swelling restrictions, which prevent further absorption once the absorbable amount is reached, leading to inadequate ink absorption in applications like ink jet printers.
Innovation Solution
A liquid absorbing sheet comprising a receiving base material with fibers and a water absorbing resin, where the bonding portion between two fiber-based sheets is designed to break upon swelling, allowing the resin to expand and absorb larger quantities of liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If SAP is enclosed between sheets to absorb liquid, then liquid absorption capability is improved, but swelling is restricted and further absorption cannot occur
Solution Approach 1:
The receiving base material is divided into two separate sheets (first sheet and second sheet) that are bonded at margins, creating a enclosed space for the SAP. This segmentation allows the SAP to swell within the confined space while maintaining structural integrity through the bonding portion that can break when swelling force exceeds bonding strength.
Solution Approach 2:
The bonding portion is designed with specific bonding strength parameters that are lower than the swelling force of SAP. This parameter change allows the bonding portion to break selectively when SAP swells, releasing the swelling restriction and enabling continued liquid absorption without SAP escaping.
2Strength
If bonding portion is made strong to prevent resin escape, then resin containment is improved, but resin swelling is restricted and absorption capacity is reduced
Solution Approach 1:
The bonding strength of the bonding portion is specifically designed to be lower than the swelling force of SAP. This parameter setting creates a controlled weakness that allows the bonding portion to break when SAP swells, enabling the SAP to expand fully and absorb maximum liquid while preventing resin escape through the bonded margins.
Solution Approach 2:
The bonding portion acts as an intermediary element between the first and second sheets. It provides initial containment for the SAP but is designed to fail in a controlled manner when swelling force exceeds bonding strength, thereby mediating between the need for containment and the need for swelling space.
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 design enables the sheet to absorb a sufficient amount of liquid by breaking the bonding portion when the resin swells, allowing for increased ink absorption and preventing resin escape, thus improving the overall absorption capacity.
Implementation Method 1
a water absorbing resin which has a water absorbing property, which is swelled in association with water absorption
Implementation Method 2
the water absorbing resin which has a water absorbing property, which is swelled in association with water absorption
Data Source
AI summary
A liquid absorbing sheet includes: a receiving base material which has a liquid permeability and which includes a first base material, a second base material, and a bonding portion at which the first base material and the second base material are bonded to each other at margins thereof, the first base material and the second base material each being composed of a material including fibers; and a water absorbing resin which has a water absorbing property, which is swelled in association with water absorption, and which is received in a portion between the first base material and the second base material surrounded by the bonding portion. In the liquid absorbing sheet described above, the bonding portion is at least partially broken when the water absorbing resin is swelled.