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Landfill compactor.

A compactor is a machine or mechanism used to reduce the size of waste material or soil through compaction.

Normally powered by hydraulics, compactors take many shapes and sizes. In landfill sites for example, a large bulldozer with spiked wheels is used to drive over waste deposited by waste collection vehicles (WCVs).

WCVs themselves incorporate a compacting mechanism which is used to increase the payload of the vehicle and reduce the number of times it has to empty. This usually takes the form of hydraulically-powered sliding plates which sweep out the collection hopper and compress the material into what has already been loaded.

Different compactors are used in scrap metal processing, the most familiar being the car crusher. Such devices can either be of the "pancake" type, where a scrap automobile is flattened by a huge descending hydraulically-powered plate. The other type is the baling press, where the automobile is compressed from several directions until it resembles a large cube.

In construction, there are three main types of compactor; the plate compactor, the "jumping jack" and the road roller. The roller type compactors are used for compacting crushed rock as the base layer underneath concrete or stone foundations or slabs. The plate compactor has a large vibrating baseplate and is suited for creating a level grade, while the jumping jack compactor has a smaller foot. The jumping jack type is mainly used to compact the backfill in narrow trenches for water or gas supply pipes etc. Road rollers may also have vibrating rollers.

Many retail and service businesses, such as fast food, restaurants, and hotels, use compactors to reduce the volume of non-recycleable waste as well as curb nuisance such as rodents and smell. In the hospitality industry tolerance for such nuisances is particularly low. These compactors typically come in electric and hydraulic operation, with quite a few loading configurations. Most popular loading configurations fall under the following:

1. Ground-Access;
2. Walk-On;
3. Secured Indoor Chute.

These compactors are almost exclusively of welded steel construction for two reasons: durability under pressure and exposure to the elements, as compactors are installed either completely outdoors or sometimes under a covered loading dock.

There are also trash compactors designed for residential use which, likewise, reduce the volume, smell, and rodent problems of garbage. This can be especially valuable for households which regularly dispose of items such as disposable-diaper boxes or the non-edible portions of vegetables from a large garden. Related to this, there are frequently limits to the number of trash bags/receptacles that can be left outside for residential pickup, which further renders such compactors beneficial to such households.

• U.S. Patent 2,234,098  — Can crusher and baler — 1941

Look up Compactor in
Wiktionary, the free dictionary.

• Compactor Construction and Operation Basics
• Preventing Injuries When Working With Ride-On Roller/Compactors, a publication from the U.S. National Institute for Occupational Safety and Health