Elongated Spout Pouch Assembly for SCR Urea Filling
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Solution Overview
Problem
Existing flexible pouches with standard, short spouts for storing aqueous urea solutions used in selective catalytic reduction systems pose a high risk of spillage when filling vehicle tanks, potentially causing corrosion and are not compliant with ISO 22241 norms due to uncontrolled flow and pressure issues.
Innovation Solution
A flexible pouch assembly with an elongated spout design that extends partially into the tank filling neck, reducing spillage risk and featuring a one-piece construction for ease of handling and storage, along with a chamfered edge for ergonomic tilting and efficient packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard short spout is used in the flexible pouch, then the pouch structure is simple and easy to manufacture, but spillage risk increases during filling due to uncontrolled flow
Solution Approach 1:
The spout length parameter is changed from standard short to elongated design, extending the discharge passage to allow controlled insertion into the tank filling neck. This parameter modification enables the spout to reach inside the filling neck, providing flow control while maintaining a simple one-piece pouch structure that is easy to manufacture.
2Reliability
If an elongated spout is used to reduce spillage, then spillage risk decreases during filling, but the spout may interfere with pouch storage and handling
Solution Approach 1:
The spout is positioned and oriented to extend along the longitudinal axis of the pouch, utilizing the length dimension efficiently. The elongated spout extends from the top surface of the pouch, allowing it to reach into the filling neck while the pouch itself maintains a compact form factor for easy storage and handling.
3Reliability
If the spout extends into the tank filling neck, then flow control improves and spillage is reduced, but pressure buildup may occur during filling
Solution Approach 1:
The spout design provides visual feedback during the filling process, allowing the user to control the filling rate by observing the liquid flow through the elongated discharge passage. This enables precise flow control to prevent both spillage and excessive pressure buildup, as the user can adjust the filling speed based on visual observation of the liquid level and flow rate.
4Ease of manufacture
If a one-piece spout construction is used, then ease of manufacture improves and assembly is simplified, but repairability decreases if the spout becomes damaged
Solution Approach 1:
The pouch assembly with integrated spout is designed as a disposable container that is replaced when empty or damaged. The one-piece construction simplifies manufacturing and ensures reliable sealing, while the disposable nature eliminates complex repair requirements. The cost-effective design prioritizes ease of manufacture and reliability over long-term repairability.
Data Source
AI summary
The application relates to a pouch assembly (100) containing a liquid being an aqueous urea solution for use in a selective catalytic reduction system for treating the exhaust gases of an internal combustion engine of a vehicle and for transferring the liquid to a liquid tank of the vehicle from the outside of the liquid tank, the pouch assembly (100) comprising a flexible pouch (1) and a spout (2) attached thereto having a base (21) extending axially through an opening (111) provided in a wall of the pouch (1) and being attached to the opening (111), a top end (22) being configured for insertion in the inside passage of the filling neck (3) of the liquid tank during the filling of the liquid tank, and a body (23) that extends between the base (21) and the top end (22) of the spout (2), the body (23) having an elongated shape, and the body (23) at least partially extending in the inside passage of the filling neck (3) of the liquid tank during the filling of the liquid tank, the base (21), the top end (22) and the body (23) having an elongated axial through-passage (211) to serve as a discharge passage for the liquid. The application relates furthermore to a system comprising such a pouch assembly (100) and a liquid tank having a filling neck (3) allowing insertion of the spout (2) for filling the liquid tank.