Flexible Bag Spout Assembly Dual Lead Thread Vibration Resistance
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Solution Overview
Problem
Existing spout assemblies for flexible bags often experience loosening issues due to vibration, creep, and deformation, particularly when coupled with different types of adapters, leading to unreliable connections during the dispensing of flowable materials.
Innovation Solution
A spout assembly featuring a dual lead thread with first and second threadforms of different lengths and diameters, positioned approximately 180° apart, which enhances initial coupling and provides a more positive engagement, along with an insert member and cap configuration that ensures secure fluid communication and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single lead thread is used for coupling the spout to adapters, then the structure is simple, but the connection loosens over time due to vibration, creep and deformation
Solution Approach 1:
The single lead thread is segmented into two separate lead threads with different lead angles, creating independent load paths that distribute mechanical stresses and prevent uniform loosening under vibration and creep conditions
Solution Approach 2:
The thread structure parameters are changed by introducing two different lead angles in the dual lead thread configuration, allowing the connection to accommodate varying stress directions and magnitudes while maintaining secure engagement
2Reliability
If a dual lead thread with different threadform lengths is used, then the connection reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The dual lead thread introduces dynamic adaptability to the static thread structure, allowing it to respond to varying load conditions and deformation patterns while maintaining reliable connection through its asymmetric geometry
Data Source
AI summary
A spout assembly for a flexible bag having a base flange, a body and a dual lead thread. The base flange has a top surface and a bottom surface. At least one of the top surface and the bottom surface are configured for coupling to a flexible bag. The body extends from the base flange and includes a proximal end corresponding to the base flange and a distal end spaced apart therefrom, and, an inner surface and an outer surface. The dual lead thread extends along the outer surface of the body between the proximal end and the distal end. The dual lead thread has a first threadform and a second threadform. The first threadform has a first threadform length. The second threadform has a second threadform length. The length of the first threadform is different than that of the second threadform.