Sealant Dispensing Nozzle Instantaneous Suction for Coagulation Prevention
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Solution Overview
Problem
The existing sealant dispensing method for LCD devices often results in sealant coagulation in the nozzle, leading to uneven dispensing and damage to scribing or cutting tools when trying to avoid coagulated sealant, requiring dispensing in dummy regions and subsequent scribing or cutting through hardened sealant.
Innovation Solution
A sealant dispensing apparatus with a syringe, nozzle, dispensing tube, atmospheric tube, instantaneous suction tube, and additional suction tube, which includes valves and regulators to control pressure and vacuum, allowing for the extraction of remaining sealant from the nozzle after dispensing and preventing coagulation, enabling uniform dispensing and avoiding damage to tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sealant is dispensed continuously in the nozzle, then dispensing efficiency is improved, but sealant coagulation occurs in the nozzle
Solution Approach 1:
The patent applies different quality requirements to different parts of the sealant flow path. The sealant in the syringe is maintained under pressure for efficient dispensing, while the sealant remaining in the nozzle is selectively removed through vacuum suction. This local differentiation of treatment prevents coagulation in the nozzle while maintaining dispensing efficiency.
Solution Approach 2:
The patent performs preliminary action by applying vacuum suction to the nozzle immediately after dispensing to prevent sealant coagulation before it occurs. The vacuum tube is positioned in the nozzle and activates right after dispensing stops, extracting any remaining sealant before it can coagulate and cause problems for subsequent dispensing operations.
2Reliability
If dispensing starts from dummy region to avoid coagulated sealant, then sealant uniformity is improved, but tool wear increases due to scribing through hardened sealant
Solution Approach 1:
The patent extracts the problematic coagulated sealant from the nozzle using a vacuum tube immediately after dispensing. By removing the remaining sealant through vacuum suction, the system eliminates the need to start subsequent dispensing operations from dummy regions, thereby avoiding scribing through hardened sealant and reducing tool wear.
3Speed
If pressure is applied to dispense sealant, then dispensing speed is improved, but sealant coagulation is accelerated in the nozzle
Solution Approach 1:
The patent employs periodic action by alternating between pressure application during dispensing and vacuum suction after dispensing. The pressure is applied only when sealant needs to be dispensed, and the vacuum is applied periodically after each dispensing operation to clear the nozzle. This periodic switching prevents continuous pressure from causing coagulation while maintaining high dispensing speed when needed.
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 solution prevents sealant coagulation in the nozzle, allows for uniform dispensing of sealant patterns outside dummy regions, and reduces tool wear by avoiding scribing or cutting through hardened sealant, ensuring efficient and precise sealant application in LCD manufacturing.
Implementation Method 1
a dispensing tube (300) connected to the syringe (120) to apply a pressure to the syringe (120)
Implementation Method 2
an instantaneous suction tube (400) connected to the syringe (120) to extract a sealant remaining in the nozzle (140) after discharging the sealant
Implementation Method 3
an additional suction tube (500) connected to the syringe (120) to prevent a sealant from moving down to the nozzle (140)
Data Source
AI summary
A sealant forming device, a sealant forming method and a method for manufacturing a liquid crystal display device using the same are disclosed. According to the present invention, a sealant coagulated in a nozzle can be minimized or prevented by performing an instantaneous suction process. A sealant forming device includes a dispenser including a syringe, and a nozzle connected to a lower end of the syringe to discharge a sealant therethrough; a dispensing tube connected to the syringe to apply a pressure to the syringe; and an instantaneous suction tube connected to the syringe to extract the sealant remaining in the nozzle after discharging the sealant.