Packaging Tie With Deflectable Pawl for Consistent Tension
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Solution Overview
Problem
Conventional packaging ties are labor-intensive, time-consuming to use, introduce variance in tension, and are difficult to untie, leading to increased packaging costs and user frustration.
Innovation Solution
A packaging tie comprising a paper-based cord with a plastic head insert molded around one end, allowing for easy formation and release of a closed loop configuration with consistent tension, using a deflectable pawl and ratchet-shaped teeth for secure engagement and easy extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional packaging ties are used, then the packaging can be secured, but the process is labor-intensive and time-consuming
Solution Approach 1:
The packaging tie is divided into two separate components: a head portion and a cord portion. The head portion includes a body with a channel and a pawl mechanism, while the cord portion is a separate element that threads through the channel. This segmentation allows for automated insertion and locking without manual knot-tying, significantly improving packaging speed and reducing labor intensity.
Solution Approach 2:
The pawl mechanism automatically engages with the cord when the cord is inserted through the channel and pulled taut. The pawl is biased by a spring to engage with the cord's surface, creating a self-locking mechanism that secures the packaging without requiring manual intervention or complex tying operations.
2Reliability
If conventional packaging ties are used, then the packaging can be secured, but there is considerable variance in packaging tension
Solution Approach 1:
The pawl mechanism provides mechanical feedback through its engagement with the cord. As the cord is pulled through the channel, the pawl engages with the cord's surface and prevents further movement once a certain tension is reached. This mechanical feedback system ensures consistent tension across different packaging operations, eliminating the variance associated with manual tying.
Solution Approach 2:
The manual knot-tying process is replaced with a mechanical locking system consisting of the pawl, spring, and channel. This mechanical substitution provides precise and repeatable tension control, replacing the imprecise manual manipulation required by conventional ties.
3Ease of operation
If conventional packaging ties are used, then the packaging can be secured, but untying is time-consuming and requires manual dexterity
Solution Approach 1:
The locking function is extracted into a separate pawl mechanism that can be independently actuated. To release the packaging, the pawl is simply pushed to disengage from the cord, allowing the cord to be pulled free without complex untying operations. This extraction of the locking function into a separate mechanism dramatically simplifies the release process.
Solution Approach 2:
Instead of requiring the user to manually untie a knot or perform complex manipulation to release the packaging, the release mechanism is inverted: a simple push on the pawl reverses the locking action. The cord is pulled tight to engage the lock, and pushing the pawl reverses this engagement, allowing easy release without manual dexterity requirements.
Data Source
AI summary
A tie well-suited for use in retail packaging applications includes a plastic head insert molded around one end of a paper-based cord, such as a length of twine, string or other similar environmentally-friendly material. In one embodiment, the plastic head includes a generally rectangular buckle shaped to define an elongated channel dimensioned to receive the free end of the paper-based cord. A deflectable pawl is coupled to the buckle and is naturally biased to project into the channel and selectively engage the cord in order to retain the tie in a closed loop configuration. The buckle includes a substantially open side wall through which the paper-based cord can be extracted after the tie is formed in its closed loop configuration. A clip is preferably provided on the head for selectively retaining a section of the paper-cord that has been inserted through the elongated channel.