Dispensing Device Local Bonding via Pretreated Injection Molding
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Solution Overview
Problem
Existing dispensing devices for foaming or foamed liquids, such as shaving foam, often experience issues with liquids or foams continuing to escape after dispensing, leading to unwanted contamination and difficulty in creating a tight connection between materials.
Innovation Solution
A dispensing device where a first material is pretreated and a second material is injection-molded against it, forming a solid connection only in desired areas, allowing for easy detachment and formation of an outlet channel, using a coating or intermediate layer to facilitate a cost-effective and simple manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a second material is injection-molded against a first material to create a tight connection, then the connection strength is improved, but it becomes difficult to detach the materials to form an outlet channel
Solution Approach 1:
The first material is pretreated in specific areas to create local differences in bonding properties. The injection molding process creates strong connections in non-pretreated areas while maintaining weak connections in pretreated areas, enabling selective detachment to form outlet channels while preserving structural integrity elsewhere.
Solution Approach 2:
The first material undergoes pretreatment before injection molding to prepare specific areas for controlled detachment. This preliminary action modifies the surface properties of the first material in advance, ensuring that when the second material is molded against it, certain areas will bond strongly while others remain easily detachable.
2Reliability
If materials are joined tightly to prevent leakage, then reliability is improved, but manufacturing complexity increases due to difficulty in creating tight connections
Solution Approach 1:
Pretreatment is applied selectively to specific areas of the first material rather than uniformly across the entire surface. This creates zones with different bonding characteristics, simplifying the manufacturing process by allowing tight connections only where needed while maintaining ease of detachment in outlet channel areas.
Solution Approach 2:
The pretreatment acts as an intermediary layer or modification that mediates between the first and second materials. It creates a controlled interface that enables reliable bonding in desired areas while preventing bonding in pretreated areas, simplifying the overall manufacturing process.
3Object-generated harmful factors
If complete joining of materials is performed to ensure tight sealing, then leakage prevention is improved, but the ability to form outlet channels deteriorates
Solution Approach 1:
The pretreatment creates local variations in bonding strength across the interface between first and second materials. Non-pretreated areas provide tight sealing to prevent liquid escape, while pretreated areas remain easily detachable to form outlet channels, achieving both goals simultaneously.
Solution Approach 2:
The interface between materials is segmented into different functional zones through selective pretreatment. Some segments are designed for strong bonding to prevent leakage, while other segments are designed for easy detachment to form outlets, dividing the joining function into multiple specialized regions.
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 prevents subsequent escape of liquids or foams, enables easy cleaning, and ensures a tight and lasting connection between materials, effectively addressing the issue of unwanted contamination and improving the manufacturing efficiency.
Implementation Method 1
a second material is injection-molded directly against the first material in an area and is thus solidly joined with the first material
Data Source
AI summary
What is being proposed is a dispensing device for a preferably cosmetic liquid and a manufacturing method. A first material is pretreated in areas through the application of a coating or embossing foil such that a second material which is injection-molded directly against it does not bond with the first material in the pretreated area but rather can be detached again.