Asymmetric Open Loop Cut for Carton Pour Spout Fitment
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Solution Overview
Problem
In aseptic packaging, forming a curved discontinuity in sheet material for pour spout fitments on liquid packaging cartons is challenging due to the risk of the severed laminate material falling into the carton, especially when the angular orientation of the pour spout fitment is not correctly aligned, and the existing partial depth cuts do not allow for flexibility in positioning.
Innovation Solution
A sheet material with a partial depth cut in the form of an open loop where one end is farther from the central zone than the other, allowing for a separation along an intermediate portion that remains interconnected, and a method to form this loop-form separation by displacing encircling and encircled portions, with overlapping ends to reduce the tendency of the encircled portion to return to its original position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional partial depth cut is formed as a closed circular loop or open loop of constant radius, then the sheet material can be separated to prevent disc falling into liquid, but the angular orientation of the pour spout fitment must be correctly aligned to avoid pushing through the uncut portion
Solution Approach 1:
The patent applies asymmetry by forming the partial depth cut as an open loop of non-constant radius instead of a closed circular loop or open loop of constant radius. Specifically, the loop has a maximum radius at one location and a minimum radius at another, creating an asymmetric geometry that eliminates the need for precise angular alignment. The asymmetric shape ensures that regardless of the pour spout fitment's angular orientation, the plunger cannot push through the uncut portion because the loop geometry inherently prevents such penetration.
Solution Approach 2:
The patent segments the sheet material into distinct portions through the open loop partial depth cut. The loop creates an encircled portion and an encircling portion that remain interconnected through an intermediate portion. This segmentation allows the encircled portion to be separated from the encircling portion in a controlled manner, preventing the disc from falling into the liquid while maintaining structural integrity through the intermediate connection.
2Manufacturing precision
If the loop ends are positioned at the twelve o'clock position on the top closure panel, then the pour spout fitment can be correctly positioned, but flexibility in positioning the open loop relative to the carton is reduced
Solution Approach 1:
The asymmetric open loop geometry with varying radius provides adaptability in positioning. Instead of requiring the loop ends to be at a specific twelve o'clock position, the asymmetric shape allows the loop to be positioned at various orientations and locations on the panel while still achieving the desired separation effect. The maximum and minimum radius points create inherent reference features that guide positioning without constraining it to a single predetermined location.
3Reliability
If the encircled portion is completely separated from the encircling portion, then the disc can fall into the liquid and obstruct pouring, but maintaining connection through intermediate portion reduces separation effectiveness
Solution Approach 1:
The patent segments the sheet material into distinct portions through the open loop partial depth cut. The loop creates an encircled portion and an encircling portion that remain interconnected through an intermediate portion. This segmentation allows the encircled portion to be separated from the encircling portion in a controlled manner, preventing the disc from falling into the liquid while maintaining structural integrity through the intermediate connection.
Solution Approach 2:
The patent applies partial action by forming a partial depth cut that does not completely penetrate the oxygen barrier layer. The cut extends through the outermost moisture barrier layer and paperboard substrate to a depth that is sufficient to create separation but not so deep as to completely disconnect the encircled portion. This partial penetration is sufficient to achieve the desired separation effect while maintaining a functional connection through the intermediate portion.
Data Source
AI summary
A top closure obturating panel (2) of a carton is formed with a partial depth cut (4) in the form of an open loop of which one end (4a) is at a greater distance from a central zone of the loop (4) than is the other end (4b). Following filling and top-sealing of the carton, there is applied to the panel (2) a pour spout fitment consisting of a flanged pour spout, a screw cap on the pour spout, and a plunger co-operating with the screw cap and the pour spout in such manner that, upon unscrewing of the screw cap, the plunger screws inwards. At its inner end, the plunger is formed with arcuate pushing blades (6), which thereby cause the laminate material of the panel (2) to fracture along the partial depth cut (4) such that an encircling portion (2a) of the panel (2) and an encircled portion (2b) within the loop (4) separate from each other along the loop (4), but remain interconnected by way of an intermediate portion (2c) extending through between the ends (4a) and (4b) of the loop (4).