Closing machines are used to close packages or containers. Many different types of equipment are available. Some closing machines secure flexible bags with a tying wire. Others affix a narrow metal strap or tape around the neck of the bag, or place a lid on a can or drum. Most closing machine suppliers offer different types of packaging machinery. Examples include accumulators, batching machines, bagging machines, banders, sleevers, box making equipment, and machines for bundling, capping, collating, combining, counting, filling, forming, sealing, and sanitizing.

Closing machines can be used to process a variety of packaging materials. Examples of packaging materials include aerosol containers, bags and pouches, blister packs, bottles and jars, cartons and boxes, cans, capsules, cartridges, cases, cups and trays, drums and kegs, pallets and pails, and tubes and vials. Intermediate bulk containers (IBCs) have a capacity of not more than 3 cubic meters and can be handled by some form, fill, and seal machines. There are several ways to close packages. Examples include caps and lids, corks, glue, heat seals, nails and staples, tapes, tucks and folds, wrappers, and tamper-resistant materials.

Closing machines differ in terms of specifications, features and applications. Most fully-automated machines list the rate, which is usually expressed in pieces per minute. Some automated closing machines include an integral feeder and a computer interface that links to a control network. Others are made from stainless steel for improved corrosion resistance. Aseptic or sanitary equipment is easy to clean and designed in a manner that inhibits the growth or presence of pathogenic microrganisms. Portable machinery is lightweight or includes wheels or casters for ease of movement. In terms of applications, closing machines are used in the chemical, medical, food processing and pharmaceutical industries. They are also used to process electronics, semiconductors, stationary, tobacco, and military products.