Dispensing Needle with Ceramic Capillary and Non-Stick Coating
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Solution Overview
Problem
Existing dispensing needles and systems face issues with mechanical and chemical attacks from dispensing materials, leading to wear and incompatibility, particularly when dealing with viscous or particulate materials.
Innovation Solution
A dispensing needle with a capillary section made of glass or ceramic materials, connected to a first connection section using a temperature-stable connection, featuring an anti-stick layer and a temperature control device to maintain optimal material properties, ensuring chemical and mechanical stability and preventing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plastic or metal connection section is used in the dispensing needle, then the needle can be manufactured with standard materials and processes, but the dispensing material reacts chemically and mechanically with the needle material, causing wear and incompatibility
Solution Approach 1:
The dispensing needle employs a composite structure where the connection section is made of plastic and the capillary section is made of ceramic materials. This composite design allows the connection section to be manufactured with standard plastic processes while the capillary section provides chemical and mechanical stability against reactive dispensing materials. The two materials work together to resolve the contradiction between ease of manufacture and reliability.
2Reliability
If a ceramic capillary section is used to prevent chemical reactions, then chemical stability is improved, but the connection between capillary and connection section becomes more complex
Solution Approach 1:
A transition section is introduced as an intermediary element between the plastic connection section and the ceramic capillary section. This transition section facilitates the connection by accommodating the different material properties and geometries of the two components. It serves as a mediator that simplifies the assembly process and reduces the overall complexity of connecting dissimilar materials.
3Manufacturing precision
If viscous dispensing material is dispensed through a capillary needle, then precise droplet application is achieved, but the material adheres to the outer circumferential surface, reducing dispensing precision
Solution Approach 1:
A non-stick coating is applied to the outer circumferential surface of the capillary section, creating a thin film barrier that prevents the viscous dispensing material from adhering to the needle surface. This coating allows the material to be dispensed precisely without sticking, maintaining droplet application precision while eliminating the harmful adhesion effect.
4Manufacturing precision
If the dispensing material is cooled or heated before dispensing, then optimal material properties are achieved, but temperature control adds device complexity
Solution Approach 1:
The temperature control device is integrated directly into the capillary needle structure, merging the heating or cooling function with the dispensing mechanism. This integration allows temperature control to be achieved without adding separate external equipment, thereby optimizing material properties while minimizing the increase in overall device complexity.
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 material reaction and wear, allowing for precise and reliable dispensing of viscous materials with improved mechanical and chemical stability, enabling efficient application of small droplets with enhanced detachment behavior.
Implementation Method 1
The capillary section (65) comprises a channel (85) extending through the first connecting section (55) to a tip (80) of the capillary section (65), the channel (85) being designed to guide a viscous dispensing material (50)
Implementation Method 2
The capillary section (65) has a non-stick layer (215) on at least a portion of its outer circumferential surface, wherein the non-stick layer (215) is arranged adjacent to the tip (80) of the capillary section (65) and is designed to reduce adhesion of the dispensing material (50) to the outer circumferential surface
Implementation Method 3
The dispensing needle (15) has a temperature control device (207), wherein the temperature control device (207) is arranged on the capillary section (65) and is configured to maintain the capillary section (65) at a predefined temperature
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
The invention relates to a dispensing needle (15) and a system with such a dispensing needle, wherein the dispensing needle comprises a first connecting section (55) and a capillary section (65) connected to the first connecting section, wherein a channel (85) extends through the first connecting section to a tip of the capillary section, wherein the channel is configured to guide a viscous dispensing material (50), wherein the first connecting section comprises a first material and the capillary section comprises a second material, wherein the first material and/or the second material comprises glass and/or ceramic.