closed-loop
klohdzd-LOOP
/ˌkloʊzdˈluːp/
Denoting a system of production in which waste is eliminated by continuously cycling post-consumer materials back into the manufacturing process.
Refers specifically to circular systems where outputs become inputs without leakage or toxic environmental release.
The story behind the word. Originally an engineering term from early 20th-century automated control theory describing a system where output feeds back into controls. In the 1970s and 80s, industrial ecologists adopted it to describe industrial systems where waste outputs serve as primary resource inputs.
Word relationships
- circular: Circular is a broader philosophical descriptor; closed-loop specifically emphasizes complete material retention within a defined boundary.
- open-loop: Open-loop systems discharge waste into external environments or lower-value cascades.
- linear: Linear systems follow a take-make-dispose pattern without continuous reuse.
Commonly confused with
- open-loop: Open-loop systems divert waste into secondary uses outside the original supply chain, whereas closed-loop recovers material for the same original purpose.
Word family
- closed loop (noun): A system where all output is continuously reused as input.
Collocations
- closed-loop system
- closed-loop economy
- closed-loop recycling
Example sentences
- "The manufacturing facility instituted a closed-loop system that captured all chemical runoff and filtered it back into production." Industrial Ecology
- "To achieve zero waste, the company deployed closed-loop supply chains across all manufacturing divisions." Supply Chain Management
Memory hook
A circle with no doors open for waste to escape; everything loops inside. Zero waste escapes the closed ring.
When not to use
Do not confuse with general feedback loops in electronics unless explicitly referring to control system engineering.
Fun facts
- Aluminum cans are one of the most successful commercial examples of closed-loop recycling, able to be recycled indefinitely without degradation.
Related words
Explore more words
production, efficiency, renewable, remediation, sustainable, efficient
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