Hot Melt Adhesive Nozzle Heating With Adjustable Valve Stroke
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Solution Overview
Problem
Conventional hot melt adhesive dispensers face challenges in maintaining consistent temperature across the nozzle while isolating it from other components, and the fixed stroke length of the valve member limits their versatility across different dispensing applications.
Innovation Solution
A dispenser module with a stroke adjustment assembly that includes a locking collar and adjustment rod, allowing for adjustable stroke length and thermal isolation of the valve member from the heater block, ensuring consistent heat distribution across the nozzle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high strength materials are used in the dispenser to withstand high forces from valve member impact, then strength is improved, but thermal conductivity decreases resulting in poor heat distribution
Solution Approach 1:
The dispenser is divided into distinct modules: a heater block for thermal processing, a nozzle body for adhesive delivery, and a valve assembly for actuation. This segmentation allows each component to be optimized for its specific function - the heater block for heat generation and the nozzle/valve assembly for mechanical impact resistance.
Solution Approach 2:
The heater block is extracted and positioned separately from the nozzle body, with thermal coupling achieved through controlled contact surfaces. This extraction allows the nozzle body to use high-strength materials while the heater block maintains thermal processing capability, resolving the conflict between strength and thermal conductivity.
2Temperature
If the nozzle is thermally coupled to maintain consistent temperature, then temperature consistency is improved, but heat transfers to other components causing overheating
Solution Approach 1:
Thermal coupling is implemented locally at specific interfaces - the heater block contacts the nozzle body at defined surfaces to maintain temperature consistency where needed, while thermal barriers or gaps are maintained at other interfaces to prevent unwanted heat transfer to pneumatic components and other non-heated parts.
Solution Approach 2:
Thermal management intermediaries such as thermal barriers, insulating materials, or controlled contact surfaces are introduced between the heater block and other components. These intermediaries allow selective thermal coupling - enabling heat transfer to the nozzle while blocking heat transfer to sensitive components.
3Ease of manufacture
If the stroke length of the valve member is fixed, then manufacturing simplicity is improved, but adaptability to different dispensing applications decreases
Solution Approach 1:
The valve assembly is designed with adjustable stroke length capability, allowing the valve member's travel distance to be modified. This dynamic adjustment feature enables the same dispenser to adapt to different dispensing applications requiring varying adhesive amounts or jetting parameters, while maintaining reasonable manufacturing simplicity through modular 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 enables reliable and adjustable dispensing of hot melt adhesive with consistent temperature and improved performance across various applications by maintaining heat concentration within the nozzle and preventing heat transfer to other components.
Implementation Method 1
a first surface of the heater block directly contacts the nozzle body
Implementation Method 2
The impact from the valve member contacting the valve seat causes a minute amount of the viscous material to jet out of an orifice defined by the nozzle
Data Source
AI summary
A dispenser for dispensing a liquid onto a substrate is disclosed. The dispenser includes a liquid supply and a dispenser module. The dispenser module includes a nozzle body having an inlet, an outlet, and a chamber for receiving the liquid. The dispenser module also includes a central valve body attached to the nozzle body that defines a piston chamber and a valve member having a piston portion disposed within the piston chamber of the central valve body and a needle portion extending form the piston portion into the chamber of the nozzle body. The dispenser further includes a heater block for heating the nozzle body. The heater block defines a liquid passage for transporting liquid from the liquid supply to the dispenser, a first surface of the heater block directly contacts the nozzle body, and the entirety of the central valve body is spaced from the heater block.