Milk carton

A carton is a box or container usually made of paperboard and sometimes of corrugated fiberboard. Many types of cartons are used in packaging. Sometimes a carton is also called a box.

A carton is a type of packaging suitable for food, pharmaceuticals, hardware, and many other types of products. Folding cartons are usually combined into a tube at the manufacturer and shipped flat (knocked down) to the packager. Tray styles have a solid bottom and are often shipped as flat blanks and assembled by the packager. Some also are self-erecting. High-speed equipment is available to set up, load, and close the cartons.

Egg cartons or trays are designed to protect whole eggs while in transit. Traditionally these have been made of molded pulp. This uses recycled newsprint which is molded into a shape which protects the eggs. More recently egg cartons have also been made from expanded polystyrene (similar to styrofoam) and PET.

Cartons for liquids can be fabricated from laminates of liquid packaging board, foil, and polyethylene. Most are based on either Tetra Pak or SIG Combibloc systems. One option is to have the printed laminate supplied on a roll. The carton is cut, scored, and formed at the packager. A second option is to have the pre-assembled tubes delivered to the packager for completion and filling. These are suited for aseptic processing and are used for milk, soup, juice, etc.

Gable top cartons are often used for liquid products such as milk, juice, etc. These use polyethylene-coated liquid packaging board and sometimes a foil laminate. Most are opened by pushing open the gables at the top back and pulling the top (spout) out. Some have fitments to assist in opening and pouring the contents.

...
Wikipedia