Liquid Supply Member Molding Prevents Resin Inflow
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Solution Overview
Problem
The existing manufacturing methods for liquid supply members with complex liquid supply paths in liquid ejection heads face challenges in maintaining sealing properties and shape integrity due to potential air bubble formation and deformation during the injection molding process.
Innovation Solution
A manufacturing method involving primary and secondary molding processes using a die-slide injection molding technique, where a concave portion and groove portion are molded separately and then connected with a molten resin, incorporating an inflow prevention structure to prevent resin flow into non-liquid supply path regions, ensuring complete filling and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plurality of components are injection molded and assembled separately, then ease of manufacture is improved, but joining precision deteriorates
Solution Approach 1:
The patent combines multiple components into a single integrated structure that is injection molded as one piece. The liquid supply member includes a body portion and a cap portion that are formed simultaneously in the same mold, eliminating the need for separate assembly operations. This merging approach maintains manufacturing efficiency while achieving high joining precision through integral formation.
Solution Approach 2:
The mold is divided into multiple cavities that can independently form different components or portions of the liquid supply member. The mold includes a first cavity for forming the body portion and a second cavity for forming the cap portion, allowing segmented molding within a single injection process. This enables complex multi-component structures to be produced with precision while maintaining ease of manufacture.
2Volume of moving object
If liquid supply paths are densely arranged to suppress head size, then compactness is improved, but air bubble formation increases
Solution Approach 1:
The patent implements localized quality control in different regions of the liquid supply member. The wall thickness is optimized locally in various sections to ensure proper resin flow and air bubble evacuation. The cap portion and body portion have different structural characteristics tailored to their specific functions, with the cap designed to seal the liquid supply paths while the body provides the flow channels. This local optimization allows dense arrangement of liquid supply paths while preventing air bubble formation that would compromise sealing.
3Manufacturing precision
If molten resin is poured to join components in a complicated shape, then joining completeness worsens, but air bubbles remain
Solution Approach 1:
The patent incorporates preliminary design features in the mold structure that facilitate complete resin filling and air bubble evacuation before the injection process begins. The mold includes gate positions and flow path designs that are pre-configured to guide molten resin through the complicated shapes of densely arranged liquid supply paths. Vent channels are also pre-formed to allow air bubbles to escape during injection, ensuring complete joining without trapped air that would compromise reliability.
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 method effectively suppresses the decrease in sealing properties and deformation of liquid supply paths, maintaining shape stability and reliability by preventing air bubble formation and ensuring complete resin filling.
Implementation Method 1
a secondary molding process of connecting the first member and the second member with a molten resin
Data Source
AI summary
There is provided a manufacturing method of a liquid supply member capable of suppressing decrease in sealing property of a liquid supply path and deformation of the liquid supply path or the external shape. For that purpose, a manufacturing process of a liquid supply member prevents inflow of a molten resin into a concave portion of a portion other than a liquid supply flow path in a liquid supply member.