Dispensing Device Plasma Bonded Valve Seal
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Solution Overview
Problem
Existing dispensing devices for foaming or foamed liquids, such as shaving foam, often experience post-dispensing dripping or foaming, leading to contamination and difficulties in material joining and manufacturing, particularly in achieving high chemical resistance and restorative forces.
Innovation Solution
A dispensing device where two materials, preferably plastics, are joined through plasma treatment and bi-injection, allowing for a chemical and solid bond without additional adhesion promoters, enabling a tight and cost-effective construction that prevents post-dispensing leakage and facilitates easy manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dispensing devices are used for foaming liquids, then dispensing function is achieved, but post-dispensing dripping or foaming occurs causing contamination
Solution Approach 1:
The discharge valve is pre-configured in a closed position and only opens when actively actuated by the user. This preliminary closed state prevents any automatic or unintended discharge of liquid or foam after the dispensing action is complete, thereby eliminating post-dispensing dripping or foaming that causes contamination.
Solution Approach 2:
The discharge valve automatically closes after dispensing without requiring additional user intervention. The valve mechanism itself performs the function of preventing contamination by self-closing, making the system self-regulating and eliminating the need for separate anti-contamination devices.
2Force
If elastic materials are used for the upper part to achieve restorative forces, then pumping action is enabled, but chemical resistance is insufficient
Solution Approach 1:
The upper part is constructed from a composite material that combines the elastic properties needed for restorative forces with chemical resistance. This allows the single component to simultaneously provide both the mechanical pumping action through elasticity and the necessary resistance to chemical degradation from contact with various liquids or foams.
3Reliability
If separate discharge valve is manufactured and tightly built in, then valve function is achieved, but manufacturing complexity increases
Solution Approach 1:
The discharge valve functionality is merged directly into the upper part of the dispensing device. Instead of manufacturing a separate valve component and assembling it, the valve features are integrated into the upper part's structure, simplifying manufacturing to a single molding process while maintaining reliable sealing function through the integrated design.
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 effectively prevents undesired dripping or foaming by ensuring a tight seal and allows for the use of non-food-safe materials, enhancing the mechanical and chemical resistance of the dispensing device while simplifying the manufacturing process.
Implementation Method 1
a first material or its surface is pretreated, in particular by means of plasma treatment and/or irradiation, in order to enable a good adhesion of the other material on the first, pretreated material
Implementation Method 2
the other material is then injected directly against the first material and can be joined to same as a result, in particular chemically and/or tightly
Implementation Method 3
an automatic elastic closing of the discharge valve and restoration of the upper part in its previous place
Data Source
AI summary
A dispensing device for a preferably cosmetic liquid as well as a method for the manufacture thereof are proposed. A lasting and tight joining of two materials is achieved while allowing for simple manufacture by pretreating the surface of the first material by means of plasma treatment or irradiation in a desired joining area in order to form radicals there or to break up the polymer chains of the first material, and by then injecting the second material directly against the first material. Another aspect consists in covering the first material with a second material for joining with another material or component.