Wrap-Around Box Closing Unit for Stable Blank Retention
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Solution Overview
Problem
The wrap-around packaging process for delicate or crumbly products like bags of corn flakes is complex and prone to failure due to the difficulty in maintaining the cardboard blank wrapped around the mandrel during the folding and gluing operations, leading to incomplete or reopened packages.
Innovation Solution
A packaging device with a mandrel and a closing unit that includes a hitting element with a tilted connecting wall, allowing it to pass closely beside retaining devices, ensuring the cardboard blank remains in position during high-speed handling, facilitating folding and gluing operations without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cardboard blank is wrapped around the mandrel during high-speed handling, then productivity is improved, but the blank tends to reopen or lose position, worsening manufacturing precision
Solution Approach 1:
The hitting element is positioned and configured in advance (with the tilted connecting wall geometry predetermined) to intercept and correct any blank displacement before it can cause reopening. The retaining devices are also pre-positioned to maintain blank stability during the critical folding and gluing operations, ensuring precision is maintained even at high production speeds
Solution Approach 2:
The hitting element acts as an intermediary between the blank and the mandrel, providing a controlled interaction point that guides the blank into proper position during the closing operation. This intermediary mechanism allows the system to maintain precision without requiring the blank to remain perfectly stable throughout the entire high-speed handling process
2Manufacturing precision
If retaining devices are used to hold the blank in position, then manufacturing precision is improved, but the closing unit cannot access the mandrel, worsening ease of operation
Solution Approach 1:
The retaining function is segmented into specific zones along the mandrel length, with retaining devices positioned only where needed to hold the blank during folding and gluing. The hitting element operates in a different spatial zone, allowing it to access the mandrel and perform the closing operation without interference from the retaining devices
Solution Approach 2:
The system dynamically coordinates the retaining devices and hitting element operations. The retaining devices hold the blank in position during critical operations, then allow controlled movement when the hitting element needs to access the mandrel for the closing operation, enabling both precision and operational ease
3Ease of operation
If the hitting element moves along a direct trajectory to press panels, then ease of operation is improved, but it interferes with retaining devices, worsening manufacturing precision
Solution Approach 1:
The hitting element employs an asymmetric tilted connecting wall geometry rather than a symmetric direct approach. This asymmetric configuration allows the element to move along a trajectory that naturally clears the retaining devices while still effectively pressing the panels together, eliminating interference and maintaining precision simultaneously
Data Source
AI summary
A packaging device for packaging articles into boxes including a mandrel, a handling unit, a first retaining device, and a closing unit. The mandrel is adapted to be wrapped at least partially by panels of a blank to form a partially closed box. The handling unit is configured to move said mandrel along a feed trajectory. The first retaining device is configured to retain at least a first panel of the blank wrapped at least partially on the mandrel. The closing unit is arranged to at least partially overlap and fix an outer panel onto an inner panel of the blank. The closing unit includes a hitting element movable along a displacement trajectory between a rest position, wherein the hitting element is in a position far from the mandrel, and a pressure position, wherein the hitting element is in a position such to press the outer panel on the inner panel and against a second abutment surface of the mandrel, and a displacement member configured to displace the hitting element between the rest position and the pressure position.