Fluid applicator with strand engagement device and operating method
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Solution Overview
Problem
Fluid application devices used for nonwoven fabrics face challenges in preventing heat damage to elastic strands during static line conditions while ensuring adequate adhesive application during active line conditions, leading to inefficiencies and material waste due to excess overspray.
Innovation Solution
A fluid application device with a strand engagement device that includes an actuating assembly and an engagement arm, which moves between two positions to adjust the distance of the strands from the nozzle, allowing for safe distance during static conditions and close proximity during active conditions to prevent heat damage and ensure efficient adhesive application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the strands are positioned close to the nozzle for adequate adhesive application, then adhesive application efficiency is improved, but heat damage to strands occurs during static line conditions
Solution Approach 1:
The strand engagement device is made movable between a first position (during active line conditions) and a second position (during static line conditions). This dynamic adjustment allows the system to optimize strand-to-nozzle distance based on operational state, resolving the contradiction between needing close proximity for efficient adhesive application and requiring greater distance to prevent heat damage during idle periods.
Solution Approach 2:
The position parameter of the strands relative to the nozzle is changed based on line conditions. During active conditions, strands are positioned at a first distance optimized for adhesive application efficiency. During static conditions, strands are repositioned to a second distance that minimizes heat exposure. This parameter adjustment resolves the contradiction by adapting the spatial relationship to operational requirements.
2Object-affected harmful factors
If the strands are positioned at a greater distance from the nozzle during static line conditions, then heat damage is prevented, but excess overspray of adhesive occurs during active line conditions
Solution Approach 1:
The movable strand engagement device enables dynamic repositioning of strands relative to the nozzle based on whether the line is active or static. During active conditions, strands are moved to a closer first position that minimizes adhesive overspray and maximizes application efficiency. During static conditions, strands are repositioned to a farther second position that prevents heat damage. This dynamic adjustment resolves the contradiction between heat protection and adhesive efficiency.
Solution Approach 2:
The system performs preliminary repositioning of the strands to the appropriate distance before adhesive application begins during active line conditions. By pre-positioning strands at the optimal first distance, the system ensures efficient adhesive application with minimal overspray, while during static conditions, strands are pre-positioned at the second distance to prevent heat damage before any adhesive discharge occurs.
3Ease of manufacture
If the applicator head operates at high temperatures to maintain glue in melted state, then adhesive discharge is enabled, but strands are burned or weakened by radiating heat
Solution Approach 1:
The harmful thermal effect is extracted or separated from the adhesive discharge function. The applicator head maintains high temperature for adhesive melting and discharge, while the strand engagement device provides thermal separation by positioning strands at an appropriate distance during static conditions. This extraction allows the heating function to operate effectively without transferring harmful heat to the strands during idle periods.
Solution Approach 2:
The movable strand engagement device acts as an intermediary between the hot applicator head and the strands. By controlling the distance between strands and nozzle, this intermediary element manages thermal exposure while allowing adhesive discharge to proceed. During active conditions, the intermediary position allows efficient adhesive transfer; during static conditions, it increases separation to prevent heat damage to strands.
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 device effectively prevents heat damage to strands during static conditions and ensures efficient adhesive application during active conditions, reducing material waste and improving application efficiency by adjusting the strand position based on the line condition.
Implementation Method 1
heat radiating from the applicator head, including the nozzle, may burn through or otherwise weaken or damage the strands
Implementation Method 2
A second fluid, such as air, may be discharged through separate outlets to control the application of the glue fiber such that the glue fiber is vacillated across the respective strands
Data Source
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AI summary
A fluid application device (10), strand engagement device (30), and method of controlling the same are provided. The fluid application device (10) includes an applicator head (16) and a nozzle assembly (22). The nozzle assembly (22) includes a guide slot (34) configured to receive a strand of material and an orifice configured to discharge a first fluid on to the strand. The strand engagement device (30) is secured to the applicator head (16) and includes an actuating assembly and an engagement arm connected to the actuating assembly. The engagement arm is configured to engage the strand and move between a first position and a second position in response to actuation of the actuating assembly. The method of controlling the strand engagement device includes receiving an input signal including content, determining the content of the input signal and operating the strand engagement device in response to, and based on the content of, the input signal.