Pen Tip Rigid Foam Composite Ink Delivery
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Solution Overview
Problem
Conventional pens with rigid or inflexible ink application parts can scratch application objects and clog with shavings, hindering stable ink application.
Innovation Solution
A pen with a pen tip section featuring a rigid tip and a penetration part filled with a foam body containing air bubbles, which communicates from the outer to the inner surface, and slits around the apex to enhance ink delivery and prevent clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid tip is used for the ink application part, then abrasion resistance is improved, but the risk of scratching the application object and clogging with shavings increases
Solution Approach 1:
The ink application part is designed with non-uniform structure: the tip portion maintains rigidity for abrasion resistance, while the body portion uses soft foam material to prevent scratching and clogging. This local differentiation of material properties resolves the contradiction between durability and harm prevention.
Solution Approach 2:
The ink application part combines rigid material (for the tip) and soft foam material (for the body) into a composite structure. This composite design allows the rigid tip to resist abrasion while the soft foam body prevents scratching and clogging, simultaneously achieving both contradictory requirements.
2Productivity
If the penetration part is left open, then ink supply is maintained, but clogging with shavings occurs
Solution Approach 1:
The soft foam body acts as an intermediary element filling the penetration part. It allows ink to pass through while blocking shavings and debris, mediating between the open penetration part and the clogging problem to maintain both ink supply and reliability.
Solution Approach 2:
The foam body is a porous material that permits ink flow while filtering out shavings. Its porous structure provides selective permeability, allowing liquid ink to pass while blocking solid particles, thus preventing clogging while maintaining ink supply.
3Object-affected harmful factors
If a soft ink application part is used, then scratching is prevented, but abrasion resistance decreases
Solution Approach 1:
The ink application part is designed with non-uniform structure: the tip portion maintains rigidity for abrasion resistance, while the body portion uses soft foam material to prevent scratching. This local differentiation of material properties resolves the contradiction between durability and harm prevention.
Solution Approach 2:
The ink application part combines rigid material (for the tip) and soft foam material (for the body) into a composite structure. This composite design allows the rigid tip to resist abrasion while the soft foam body prevents scratching, simultaneously achieving both contradictory requirements.
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 allows for stable ink application while minimizing abrasion and clogging, ensuring consistent ink supply and improved performance across various application angles.
Implementation Method 1
The penetration part is in the form of a slit (gap) or a hole and is configured to guide the ink, which has been supplied by the ink reservoir, from the inner surface side of the ink application part onto the outer surface of the ink application part by the capillary action.
Data Source
AI summary
A pen includes: an ink reservoir configured to store an ink; and a pen tip section including an ink application part configured to apply the ink to an ink application object. The ink application part of the pen tip section includes: a rigid tip made of a rigid material and having a hemispherical outer surface, an inner surface facing toward the ink reservoir, and a penetration part penetrating from the inner surface side to the outer surface side of the rigid tip; and at least one foam body filled in the penetration part at least on the side of the penetration part close to the outer surface side of the rigid tip, and provided with at least one air bubble formed to communicate from the outer surface side of the foam body to the inner surface side of the foam body.