What Happens to Recycled Milk Containers

Plastic Milk Jugs
Milk jugs are made from high-density polyethylene plastic (HDPE), which is one of the most versatile plastic resins and most valuable plastics for recycling. In Canada, there are several plastic recycling facilities that convert scrap used milk jugs back into usable plastic. 

The used jugs are baled and sent to the recycling facility where they are chipped and washed. The clean chipped plastic is then melted at high temperature and formed into pellets. The pellets are sold to plastic forming plants, which use the material to make non-food plastic products including such items as: 

  • plastic pipe

  • drainage tile

  • flower pots

  • plastic dimensional lumber used to build picnic tables, patio furniture or decks

  • non-food packaging such as plastic detergent bottles and lubricating oil pails

  • toys, cases and other formed plastic products

Each collected bale weighs approximately 550 kg and consists of more than 8,300 used milk jugs. 

 

Polycoated Milk Cartons
Milk cartons are made from ‘polycoat’ – lightweight, high-grade paperboard sandwiched between two thin layers of polyethylene film. The result is a strong, rigid container that effectively maintains the integrity of the product inside. 

Polycoat material can be converted into new material using a process known as hydrapulping. A hydrapulper is like an enormous blender, where a combination of heat, water and agitation break down the material to produce raw fibre, or pulp. The pulp is then used to make new paper products such as corrugated medium (the inner layer of corrugated cardboard), linerboard, household tissue products and even fine writing papers. The small amount of residual polyethylene can be screened off for use in other plastic and composite materials. 

Inside the hydrapulper, heat, water and polycoat material combine to produce a slurry that, when dried, yields high-grade paper fibre.

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