Foam Pad Formation System Preventing Jams via Web Integrity
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Solution Overview
Problem
Conventional methods for manufacturing flat, rectangular foam cushions require manual operator intervention to prevent foam-ups and jams, leading to inefficiencies and potential explosions due to the need for precise timing and handling of expanding foam bags between conveyor belts.
Innovation Solution
A pad formation system that uses a continuous bag chain web fed into a conveyor assembly with a corrugated surface, allowing for automated operation and minimizing the risk of foam-ups by maintaining the web intact until cutting, and employing sensors and a constant temperature cutting mechanism for precise bag separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual operator intervention is used to feed bags into the conveyor gap, then foam-ups and jams can be prevented, but production efficiency is reduced and operational complexity increases
Solution Approach 1:
The system performs preliminary actions by maintaining the bag web intact and using sensors to detect bag positions before feeding into the conveyor. The conveyor belts are synchronized to move together, and the bag web is gradually drawn in rather than forced, preventing foam expansion issues before they occur. This eliminates the need for reactive manual intervention while maintaining reliability.
Solution Approach 2:
The system enables self-service operation where the automated conveyor system feeds bags without human intervention. The sensors and synchronized belt mechanism work autonomously to prevent foam-ups and jams, allowing continuous production while eliminating manual feeding requirements and associated productivity losses.
2Ease of operation
If the bag web is cut early during foam expansion, then individual bags can be handled separately, but the risk of foam-ups increases due to premature expansion
Solution Approach 1:
The system maintains the bag web intact during the critical foam expansion phase, performing the cutting action only after the foam has cured. This preliminary maintenance of web integrity prevents premature expansion issues while still enabling individual bag handling at the appropriate time in the process.
Solution Approach 2:
The system cushions against the risk of foam-ups by keeping the bag web intact until foam expansion is complete and controlled. The web acts as a constraint that prevents premature expansion, and only after the foam has cured does the system separate individual bags, thereby cushioning against potential foam-up problems.
3Manufacturing precision
If conveyor belts are spaced closer together to reduce pad thickness variation, then manufacturing precision improves, but the risk of foam expansion restriction increases
Solution Approach 1:
The system performs preliminary actions by maintaining the bag web intact and using sensors to detect bag positions before feeding into the conveyor. The conveyor belts are synchronized to move together, and the bag web is gradually drawn in rather than forced, preventing foam expansion issues before they occur. This eliminates the need for reactive manual intervention while maintaining reliability.
Solution Approach 2:
The system enables self-service operation where the automated conveyor system feeds bags without human intervention. The sensors and synchronized belt mechanism work autonomously to prevent foam-ups and jams, allowing continuous production while eliminating manual feeding requirements and associated productivity losses.
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 system achieves fully automated production of foam cushions with reduced risk of foam-ups and jams, improving efficiency and safety by maintaining the bag web integrity until cutting and using sensors for precise separation, thus enhancing the production process.
Implementation Method 1
The foam rises and solidifies while contained between the conveyor belts
Implementation Method 2
A pad web separator positioned downstream from the output end of the conveyor assembly includes a heated wire cutter mechanism
Data Source
AI summary
A foam cushion pad formation assembly that includes a conveyance assembly having at least one moving conveyor component presenting a pad shape formation surface, which surface is convoluted and arranged to shape sealed enclosures of a pad chain received by the conveyance assembly. A separation device is provided to separate shaped pads of the pad chain received by said conveyor device. The shaped pads include convoluted surface that are formed by way of gripping projection and recesses combinations in the moving conveyor component. Embodiments include sensing for non separated pads from a downstream end of the bag chain, pad chain separation enhancement devices, and various control system including the requirement of confirmation of separation before feeding a new pad enclosure as in one containing liquid polyurethane precursor chemicals. An embodiment includes a pad chain path disruption sensor and a form feed control which implements the formation of pad enclosures free of filler material in a bridging region between the outlet end of the enclosure formation means and the conveyance assembly.