Carbonless Copy Note Pad Coarse Particle Coating Pressure Dispersion
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Solution Overview
Problem
Conventional carbonless copy note pads require a separate cardboard divider to prevent writing from affecting subsequent sheets, which is inconvenient.
Innovation Solution
A carbonless copy note pad design featuring a stack of note sheet sets with a writing surface, a back surface, a color-developing coating layer, and a coarse particle coating layer on the lower surface of the second paper sheet, which disperses scribbling pressure to prevent it from acting on subsequent sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional carbonless copy note pad uses bonded note sheet sets, then the note sheets are securely held together, but writing pressure transfers to subsequent sheet sets requiring a cardboard divider
Solution Approach 1:
The invention applies a coarse particle coating layer specifically on the lower surface of the second paper sheet of each note sheet set. This localized treatment creates a rough surface only where needed to prevent writing transfer to subsequent sets, while maintaining smooth surfaces elsewhere for proper bonding and writing functionality.
Solution Approach 2:
The coarse particle coating layer acts as an intermediary between the topmost note sheet set and subsequent sets. This intermediate rough layer disperses scribbling pressure before it reaches the bonded note sheets below, preventing unwanted writing transfer without compromising the bonding integrity of the note sheet sets.
2Object-affected harmful factors
If a cardboard divider is placed between note sheet sets, then writing transfer is prevented, but the device becomes more complex and inconvenient to use
Solution Approach 1:
The invention merges the function of preventing writing transfer directly into the note sheet set structure by coating the lower surface of the second paper sheet with coarse particles. This eliminates the need for a separate cardboard divider component, simplifying the overall device structure while maintaining the same protective function.
Solution Approach 2:
Each note sheet set becomes self-sufficient in preventing writing transfer to subsequent sets through its own coarse particle coating layer. The structure serves itself by having the second paper sheet's lower surface inherently prevent scribbling pressure transmission, eliminating the need for additional divider components.
3Ease of manufacture
If the lower surface of the second paper sheet is made smooth, then bonding is effective, but scribbling pressure acts on subsequent note sheet sets
Solution Approach 1:
The invention creates different surface qualities in different locations: the upper surface of the second paper sheet remains smooth for effective bonding with the first paper sheet, while the lower surface is treated with coarse particles to prevent scribbling pressure transmission. This localized differentiation resolves the contradiction between bonding effectiveness and pressure prevention.
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 coarse particle coating layer effectively prevents the transfer of writing pressure to subsequent sheets, allowing the note pad to be used without a separate divider, ensuring that only the topmost sheet set is affected by scribbling, while maintaining clear replicas on the copy sheets.
Implementation Method 1
The coarse particle coating layer is formed on the lower surface of the second paper sheet, and has a roughened surface such that a scribbling pressure resulting from a scribbling movement on the writing surface of the first paper sheet is dispersed so as to prevent the scribbling pressure from acting on a next one of the note sheet sets
Implementation Method 2
a color-developing coating layer which is disposed such that when a user writes a message on the writing paper sheet 901 of the topmost note sheet set 91, a replica of the message is formed on an upper surface of each of the upper and lower copy paper sheets 902, 903
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A carbonless copy note pad (1) includes a stack of note sheet sets (10). Each of note sheet sets (10) includes first and second paper sheets (11, 12), first and second adhesive layers (31, 33), a color-developing coating layer (2), and a coarse particle coating layer (4). The color-developing coating layer (2) is formed on at least one of the first and second paper sheets (11, 12). The coarse particle coating layer (4) is formed on a lower surface (122) of the second paper sheet (12), and has a roughened surface (41) to prevent a scribbling pressure applied to a writing surface (111) of the first paper sheet (11) of a topmost one of the note sheet sets (10) from affecting a next one of the note sheet sets (10).