Description Tetra Laval International is the holding company and financial support and control function for the Tetra Laval Group and its three autonomous subsidiaries. The flagship Tetra Pak group designs and sells equipment used to process, package, and distribute liquid food products. DeLaval makes and sells equipment for dairy farmers, as well as milk production and animal husbandry products. Sidel manufactures glass, plastic, and metal container/packaging equipment. Worldwide the group has about 25 plants, more than 30 service units, with operations in almost 200 countries. Tetra Laval is controlled by the family of Ruben Rausing, inventor of the milk carton and founder of Tetra Pak.