Dispensing Cap Helical Flow Profile Clean Pour
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Solution Overview
Problem
Existing dispensing closures face challenges in providing a 'clean pour' and allowing inverted storage without spurring, while being difficult to manufacture and recycle due to complex silicone valve structures and dual plastic materials.
Innovation Solution
A one-piece dispensing closure with a unique internal flow structure featuring a helically threaded flow conduit that provides an unobstructed center channel and passive flow restriction, using a single type of plastic for easy recycling and manufacturing simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silicone valve structure is used to provide clean pour and inverted storage, then the dispensing closure achieves clean pour and inverted storage capability, but the manufacturing complexity and cost increase due to multiple inter-fitting parts
Solution Approach 1:
The patent merges the valve structure into a single integrated closure body made of one-piece thermoplastic material, eliminating the need for separate silicone valve components and inter-fitting parts. The flow conduit with helical flow profile is molded directly into the closure body, simplifying manufacturing while maintaining clean pour and inverted storage capabilities.
Solution Approach 2:
The single-piece closure body performs multiple functions that previously required separate components: it provides the closure structure, the flow restriction mechanism, the clean pour function, and the inverted storage capability. The helical flow profile within the closure body integrates flow control and product containment in one component.
2Reliability
If a silicone valve structure is used to provide clean pour and inverted storage, then the dispensing closure achieves clean pour and inverted storage capability, but the recycling difficulty increases due to separation requirements
Solution Approach 1:
The closure is constructed entirely from one type of thermoplastic material with uniform composition throughout. The single-piece construction ensures that the entire closure body, including the flow conduit and helical flow profile, can be recycled together without separation requirements, significantly improving recyclability compared to multi-material silicone valve structures.
3Ease of operation
If the product is positioned at the dispensing closure for inverted storage, then the dispensing ease improves, but the product spurting problem worsens when the lid is opened
Solution Approach 1:
The flow conduit features a helical flow profile with specific geometric characteristics that create localized flow resistance. The helical geometry generates friction and surface tension effects at specific points along the flow path, providing sufficient restriction to prevent spurting when inverted while allowing smooth flow when the container is squeezed in the correct orientation.
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
The solution enables a 'clean pour' by preventing immediate spurring when inverted and allowing easy dispensing upon squeezing, while being recyclable and cost-effective, addressing manufacturing and recycling complexities.
Implementation Method 1
provides sufficient surface area in the regions surrounding the flow conduit to creates capillary surface tension and friction with the product and thus tend to restrict the free flow of the product through the unobstructed center channel
Implementation Method 2
creates capillary surface tension and friction with the product and thus tend to restrict the free flow of the product through the unobstructed center channel
Implementation Method 3
The combination of the helically threaded flights and center dispensing channel have also been found to provide a 'suck-back' effect, withdrawing the product back into the container when pressure is released from the container
Data Source
AI summary
A dispensing closure for viscous fluids contains a closure body, a closure lid and a living hinge structure hingeably connecting the closure lid to the closure body. The closure body includes an upper deck, a skirt configured and arranged to mount to a product container, and a flow conduit extending through the upper deck to provide a flow path from an interior of the closure to an exterior of the closure. The flow conduit includes an entrance orifice and an exit orifice, and an inner wall extending between the entrance orifice and the exit orifice. To provide the desired flow effect, the inner wall includes at least one flow inhibitor structure, such as helically threaded flights extending at least partially inwardly from the inner wall into the flow path to define an unobstructed central flow path and a partially obstructed peripheral flow path.