Adhesive Bonding Temperature Control for Syringe Piercing Devices
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Solution Overview
Problem
The challenge lies in adequately wetting the contact surfaces of piercing devices and syringe bodies with adhesive for secure bonding, while minimizing adhesive usage and preventing unwanted interactions with medications, especially when the piercing medium channel is large, leading to financial and safety issues.
Innovation Solution
A method involving urethane methacrylate adhesive, where the adhesive's viscosity is controlled by temperature to ensure optimal wetting without excessive flow, and the contact surfaces are tempered to match the adhesive's temperature within a tolerance deviation to prevent viscosity changes, ensuring a reliable adhesive connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lancing agent channel is designed with a larger diameter to ensure sufficient adhesive wetting, then the adhesive can adequately wet the contact surfaces, but a larger quantity of adhesive is required and there is a risk of adhesive entering the storage container
Solution Approach 1:
The patent applies parameter changes by controlling the temperature of the adhesive to adjust its viscosity. The adhesive is heated to a specific temperature range (20°C to 40°C, preferably 25°C to 35°C) before application, which reduces its viscosity and improves wetting capability without requiring a larger channel diameter. This allows adequate bonding reliability while minimizing adhesive quantity and preventing contamination of the storage container.
2Reliability
If the lancing agent channel is designed with a larger diameter to ensure sufficient adhesive wetting, then the adhesive can adequately wet the contact surfaces, but the adhesive holding power decreases
Solution Approach 1:
The patent uses parameter changes by precisely controlling adhesive temperature to optimize both wetting and holding power. By maintaining the adhesive within a specific temperature range (20°C to 40°C), the viscosity is optimized to provide sufficient wetting of contact surfaces while maintaining adequate bonding strength. This eliminates the need to increase channel diameter, thereby preserving adhesive holding power.
3Reliability
If very low-viscosity adhesives are used to improve wetting, then the adhesive can wet the contact surfaces easily, but the adhesive forms droplets and may leak through the piercing channel into the reservoir
Solution Approach 1:
The patent applies parameter changes by controlling the adhesive temperature to an optimal range (20°C to 40°C) that reduces viscosity for good wetting while preventing excessive flow. This temperature control ensures the adhesive has sufficient流动性 to wet contact surfaces adequately but maintains enough viscosity to prevent droplet formation and leakage into the reservoir, eliminating the harmful effects associated with very low-viscosity adhesives.
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 achieves a strong and reliable adhesive bond that withstands specified pull-out forces, reducing financial and safety risks associated with adhesive usage and interactions, while maintaining the adhesive's desired viscosity and preventing unwanted contamination.
Implementation Method 1
The viscosity of adhesives is typically dependent on temperature. According to the invention, the adhesive has a temperature T2 at which the adhesive also exhibits the required viscosity.
Implementation Method 2
at least the contact surfaces of the first and second components are tempered before the adhesive is applied, so that the temperature T1 of the first and/or the second contact surface differs from the temperature T2 of the adhesive only by a tolerance deviation
Data Source
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AI summary
The invention relates to a method for joining a first component, in particular a piercing device, with a second component, in particular a syringe body, for the manufacture of a product for medical or cosmetic purposes, by means of adhesive bonding, comprising the following steps: d) providing the first and the second component; e) tempering at least a first contact surface of the first component and/or at least a second contact surface of the second component to a temperature T1; f) applying an adhesive to at least a section of the first contact surface and/or to at least a section of the second contact surface, wherein the adhesive has a temperature T2, wherein the temperatures T1 and T2 differ only by a tolerance deviation, the tolerance deviation being a maximum of 10°C.