Nested Pouch Pressure Zone for Viscous Liquid Reservoirs
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Solution Overview
Problem
Existing spray gun systems face challenges in efficiently dispensing and removing viscous coating liquids from reservoirs, leading to waste and difficulty in application.
Innovation Solution
A flexible outer pouch with a nested inner pouch creates a pressure zone that, when pressurized, expels liquid from the inner pouch through a fluid aperture, allowing efficient liquid delivery to spray guns, with the outer pouch inflating to support the system and reducing packaging volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stiff container with a flexible liner is used (WO 2004037431), then the liquid can be supplied to the spray gun, but viscous coating liquids are difficult to remove from the reservoir under gravity or siphon action
Solution Approach 1:
The patent applies pneumatic pressure through an air supply assembly that delivers pressurized air into the pressure zone between the inner and outer pouches. This pressurization forces viscous coating liquids out of the reservoir and through the spray gun, overcoming the limitation of gravity or siphon action alone and enabling complete removal of viscous materials without waste.
Solution Approach 2:
The patent changes the pressure parameter by introducing an external pressure source that actively pressurizes the liquid reservoir. This transforms the passive gravity/siphon system into an active pressurized system, enabling viscous liquids to be expelled efficiently and completely, thereby reducing liquid waste while improving ease of operation.
2Ease of manufacture
If a flexible outer pouch with nested inner pouch is used, then packaging volume is reduced and assembly is simplified, but the system requires an external pressure source to function
Solution Approach 1:
The patent employs a nested pouch configuration where the inner pouch containing the coating liquid is placed within an outer pouch that forms the pressure zone. This nested structure simplifies assembly and manufacturing while enabling the flexible, collapsible reservoir design that reduces packaging volume. The dual-pouch system integrates the liquid containment and pressure application functions in a compact arrangement.
Solution Approach 2:
The pressure zone between the inner and outer pouches serves multiple functions: it contains the coating liquid, transmits external pressure to expel the liquid, and provides structural support for the flexible reservoir. This multi-functional design reduces device complexity by combining several functions into a single integrated system rather than requiring separate components.
3Loss of substance
If pressure is applied in the pressure zone to expel liquid, then liquid waste is minimized, but the outer pouch must be flexible to inflate upon pressure application
Solution Approach 1:
The patent utilizes flexible film materials for both the inner and outer pouches, allowing the outer pouch to inflate and transmit pressure when an external pressure source is applied. This flexibility enables complete expulsion of viscous coating liquids from the reservoir, minimizing liquid waste while maintaining the structural integrity needed to contain and pressurize the liquid effectively.
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 minimizes liquid waste, facilitates efficient liquid application, and reduces material and storage costs by using flexible pouches that can be easily assembled and disassembled, while maintaining a secure and fluid-tight connection to the spray gun.
Implementation Method 1
A pressure zone is located between the outer surface of the inner pouch and the inner surface of the outer pouch. Upon supply of an external pressure source to the inlet port, pressure is applied in the pressure zone thereby expelling a liquid from the coating liquid chamber through the fluid aperture.
Data Source
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AI summary
Provided are coating liquid reservoirs for use with a fluid inlet of a spray gun, the coating liquid reservoir comprising: a flexible outer pouch and a flexible inner pouch nested within the outer pouch, the inner pouch defining a coating liquid chamber, wherein upon supply of an external pressure source into a pressure zone between the inner and outer pouches, pressure is applied to the coating liquid chamber thereby expelling a liquid from the coating liquid chamber. The outer pouch inflates upon application of pressure in the pressure zone. Methods of making and using the same are also provided.