All-Plastic Pouring Spout Assembly for Pry-Off Resistance
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Solution Overview
Problem
Existing foldable pouring spouts are vulnerable to pry-off and tampering, and existing all-plastic solutions lack sufficient tamper evidence, posing risks for brand owners and complicating recyclability.
Innovation Solution
A container closure assembly with a foldable pouring spout and a securing ring that is integrally formed with a frangible connection, featuring a radially outer wall with a central flexure zone and a distal end portion that can be snap-fitted onto a container neck, providing enhanced mechanical advantage and resistance to pry-off attempts, along with tamper-evident features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal retainers are used to crimp the pouring spout onto the container neck, then the spout is securely fixed, but the retainers can rust and are not easily recyclable
Solution Approach 1:
The patent replaces the metal retainer crimping system with a plastic press-in system. The pouring spout is made of plastic material that is pressed directly onto the container neck, eliminating metal components entirely. This substitution resolves the rust and recyclability problems while maintaining secure fixation through the plastic-to-plastic press-fit connection.
Solution Approach 2:
The patent uses homogeneous plastic material for both the pouring spout and the container neck, creating a uniform all-plastic assembly. This homogeneity eliminates the metal-plastic interface problems (rust, galvanic corrosion) and simplifies recycling by making the entire assembly compatible with plastic recycling processes.
2Ease of manufacture
If an all-plastic press-in pouring spout assembly is used, then recyclability is improved, but the assembly can be pried off without visible damage
Solution Approach 1:
The patent incorporates pre-designed frangible elements (tear strips) that are positioned to break upon any unauthorized removal attempt. These elements are strategically placed so that any pry-off action, whether legitimate or tampering, will cause visible damage to the frangible strips, providing tamper evidence while allowing legitimate opening.
Solution Approach 2:
The frangible elements are designed with visible color changes or distinctive markings that indicate whether they have been broken. When intact, they maintain a uniform appearance; when broken due to tampering, they show visible discontinuities or color changes that provide clear tamper evidence to the consumer.
3Ease of manufacture
If the radially inwardly extending lip of the outer wall is made of small cross-section, then the spout can be stripped from the mold tool without undue difficulty, but the assembly becomes vulnerable to pry-off
Solution Approach 1:
The patent uses composite plastic materials with different properties in different regions of the spout assembly. The main body uses a robust material for strength and pry-off resistance, while the lip region uses a slightly more flexible material that allows mold stripping without breaking. This composite approach enables both easy manufacturing and high security.
Solution Approach 2:
The patent applies local quality by making the lip region of the spout slightly different in material properties or structural characteristics compared to the main body. The lip is designed with specific local features (such as increased flexibility or reduced thickness in controlled areas) that facilitate mold stripping, while the overall assembly maintains high strength and pry-off resistance through the bulk material properties.
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 enhances pry-off resistance and provides clear visual tamper evidence, ensuring the integrity of container contents while maintaining recyclability and reducing the risk of unauthorized access.
Implementation Method 1
a closure member of plastics material removably sealingly engageable across the dispensing aperture to selectively allow or prevent dispensing of container contents through the dispensing aperture; wherein the closure member is integrally formed with a securing ring which is attached to the closure member by a frangible connection
Implementation Method 2
the radially outer wall having a proximal portion lying towards the first end of the foldable pouring spout and a distal end portion lying away from the first end of the foldable pouring spout; the radially outer wall comprising a central flexure zone of reduced radial width relative to the proximal and distal end portions and which interconnects the proximal and the distal end portions, whereby the distal end portion is hingeingly deflectable relative to the proximal portion
Implementation Method 3
the thus assembled closure assembly being snap-fittingly engageable over and around the container neck
Data Source
AI summary
A securing ring is snap-fittingly engageable over and around an annular mounting flange of a foldable pouring spout in a container closure assembly, with a frangible connection between the securing ring and a spout closure member (e.g. a screw cap) intact. The assembled closure assembly is snap-fittingly engageable over and around a container neck which is received in a groove extending circumferentially about the mounting flange. The groove is defined in part by a radially outer wall having a proximal portion lying towards the pouring end of the spout and a distal end portion lying away from the pouring end of the spout. The radially outer wall comprises a central flexure zone of reduced radial width relative to the proximal and distal end portions, whereby the distal end portion is hingeingly deflectable between a radially outer position for extraction of the spout from a mold tool, and a radially inner position for engagement in an annular undercut in a radially outer surface of the container neck. When the securing ring is snap-fittingly engaged over and around the mounting flange, the distal end portion is held in the radially inner position. The distal end portion comprises a chamfer at its radially inner side and which extends radially inwards towards the pouring end of the spout for guiding the closure assembly into snap-fitting engagement with the container neck.