Spray Gun Liner-Lid Latching for Leak-Resistant Fluid Storage
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Solution Overview
Problem
Large volume fluid containers used in spray guns face issues with fluid leakage due to insufficient coupling between the lid and liner, especially with high-solids coating fluids, leading to spillage and leakage during handling and storage, exacerbated by positive pressure from fluid volatility and temperature changes.
Innovation Solution
A collapsible liner with a latching member and a lid that securely couple using latches, such as tabs and protrusions, or adhesives, to prevent detachment and leakage, with optional outer collars or frames providing additional sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large volume fluid container is used to minimize waste associated with fluid transfer and cleanup, then productivity is improved, but the lid and liner coupling becomes insufficient to withstand positive pressure from fluid volatility and temperature changes, leading to fluid leakage
Solution Approach 1:
The container is divided into separate components (lid, liner, cup, collar) that can be independently manufactured and assembled. The liner is a separate collapsible component that can be replaced independently from the rigid cup structure, allowing each part to be optimized for its specific function while maintaining overall system reliability for large volume applications
Solution Approach 2:
The collapsible liner is nested within the rigid cup, with the lid sealing the top opening. This nested configuration allows the flexible liner to contain the fluid while the rigid cup provides structural support for large volumes, and the collar secures the lid assembly to the cup, creating a multi-layer containment system that maintains reliability at large scales
2Ease of operation
If the lid and liner are removed from the cup after use, then ease of operation is improved, but the coupling between lid and liner may not be sufficient to withstand positive pressure, resulting in fluid leakage during storage
Solution Approach 1:
The lid and liner are designed as disposable components that are discarded after a single use. This eliminates the need for complex, durable coupling mechanisms that would be required for reusable systems, while still providing sufficient reliability during the brief period of storage before disposal. The low cost of these disposable components makes them economically viable despite their limited service life
Solution Approach 2:
The lid and liner are combined into a pre-assembled unit that is inserted into the cup as a single assembly. This merging ensures proper alignment and coupling between the lid and liner before the unit is removed from the cup, maintaining reliability during storage while preserving ease of operation through simple removal and disposal of the combined unit
Data Source
AI summary
Fluid liners and container assemblies for a spraying apparatus and related methods of use are provided. The disclosed liners include a side wall defining a fluid-containing portion and an open end, a flange extending outwardly from the side wall, and a latching member coupled to the flange, where the latching member includes a retaining feature for releasably coupling the side wall to a lid compatible with the liner. Disclosed fluid containers include a lid having a fluid outlet adapted to couple the lid to the spraying apparatus and a collapsible liner, where either the liner or lid comprises a latch that releasably couples the liner and the lid to each other. Advantageously, the fluid liners and fluid containers can provide enhanced storage options for container contents between spraying operations.