Counter-Rotating Compactor with Interlocking Lobes for PET Shape Recovery
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Solution Overview
Problem
Current compactors for plastic containers, especially those made of PET, are inefficient due to shape memory polymers that cause containers to return to their original shape after compaction, leading to suboptimal storage capacity and frequent emptying of smart skips.
Innovation Solution
A compactor device with a unique design featuring counter-rotating shafts and protruding compaction elements with matching lobe-shaped profiles, which effectively compress and store containers by preventing shape recovery, and includes an identification system for selective storage based on material or content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional roller compactors are used to compact PET containers, then the containers are initially compressed into a film, but the shape memory of the material causes them to return partially to their original shape, resulting in increased storage space requirements
Solution Approach 1:
The invention changes the compaction parameters by using a mechanical interlocking system with protruding elements and corresponding recesses that physically prevent shape recovery. This transforms the compaction from a simple compression process to a constrained configuration that exploits the shape memory effect in reverse, locking containers in a compacted state
Solution Approach 2:
The compacting device uses segmented protruding elements distributed around the rotating shaft, each capable of independently engaging with containers. This segmentation allows simultaneous compaction of multiple containers while maintaining individual control over each compaction zone
2Adaptability or versatility
If smart skips are equipped with recognition systems for material identification, then selective waste collection is improved, but the complexity of the device increases
Solution Approach 1:
The system uses the containers' own characteristics (shape, size, material properties) to automatically direct them to appropriate storage bins through the compaction process. The protruding elements and recesses create a self-sorting mechanism where different container types are naturally directed to different bins without requiring external identification systems
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 device achieves efficient compaction and storage of plastic containers, reducing the need for frequent emptying and allowing for separation based on material or usage, thereby enhancing waste recycling efficiency.
Implementation Method 1
These materials are shape memory polymers, that is to say, they are capable of returning from a temporarily deformed state to the original state.
Implementation Method 2
the containers or packaging, once inserted into the smart skip, are first compressed or compacted in such a way that they take up less space
Data Source
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AI summary
Described is a compacting device (1) for compacting articles, preferably containers, comprising a compacting unit (10) in turn comprising a first operating member (20) associated with a first rotating shaft (21) and a second operating member (30) associated with a second rotating shaft (31), wherein the first operating member (20) comprises at least four protruding compaction elements (22a, 22b, 22c, 22d) arranged successively, or consecutively, along a circumferential direction of said first rotating shaft (21). Subsequent or consecutive protruding compaction elements of said at least four protruding compaction elements (22a, 22b, 22c, 22d) of said first operating member (20) are alternated in said circumferential direction of said first rotating shaft (21) by a depression or recess (23a, 23b, 23c, 23d) of said first operating member (20). The second operating member (30) comprises at least four protruding compaction elements (32a, 32b, 32c, 32d) arranged successively, or consecutively, along a circumferential direction of the second rotating shaft (31), wherein successive, or consecutive, protruding compaction elements, of said at least four protruding compaction elements (32a, 32b, 32c, 32d) of said second operating member (30) are alternated in said circumferential direction of said second rotating shaft (31) by a depression or recess (33a, 33b, 33c, 33d) of said second operating member (30). Each protruding compaction element (22a, 22b, 22c, 22d) of said at least four compaction protruding elements (22a, 22b, 22c, 22d) of said first operating member (20) extends radially from said first rotating shaft (21) so as to operate in conjunction, in use, with a depression or recess (33a, 33b, 33c, 33d) of the second operating member (30) in order to compact an article, while each protruding compaction element (32a, 32b, 32c, 32d) of said at least four protruding compaction elements (32a, 32b, 32c, 32d) of said second operating member (30) extends radially from said second rotating shaft (31) so as to operate in conjunction, in use, with a depression or recess (23a, 23b, 23c, 23d) of the first operating member (20) in order to compact an article. In at least a first operating configuration, one of the four protruding compaction elements (22a, 22b, 22c, 22d) of the first operating member (20) is received in a corresponding depression or recess of the four depressions or recesses (33a, 33b, 33c, 33d) of the second operating member (30) and in at least a second operating configuration one of the four successive, or consecutive, protruding compaction elements (32a, 32b, 32c, 32d) of the second operating member (30) is received in a corresponding depression or recess of the four depressions or recess (23a, 23b, 23c, 23d) of the first operating member (20). The invention further relates to a method for compacting an article, preferably a container.