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HDPE-bottled dairy beverages 'milk' 90-day shelf life

Canadian dairy products marketer Natrel is the first North American user of an ultra-high-temperature processing/aseptic filling line. The process permits Natrel to launch single-serve milks and shakes with a 90-day refrigerated shelf life.

Natrel?s St. Laurent, Quebec, plant?s sophisticated UHT processing/aseptic filling line includes three separate rinsing machines
Natrel?s St. Laurent, Quebec, plant?s sophisticated UHT processing/aseptic filling line includes three separate rinsing machines

Refrigerated milks and shakes with a 90-day shelf life are making a splash in Canada for Natrel. The Longueuil, Quebec-based dairy is the first North American user of an integrated ultra-high-temperature processing/aseptic filling system that produces the beverages.

Natrel invested C$17.4 million (US$12 million at the time) to renovate and re-equip its St. Laurent, Quebec, plant. Equipment from Serac (Carol Stream, IL) processes these Natrel products at ultra-high temperatures and fills them into single-serve, resealable, high-density polyethylene bottles.

Natrel's Moostache-brand milks first reached stores last May. The line included 2% milkfat white and 1% chocolate and Caf/ au lait flavors. Near the end of last year, Natrel launched a 1% milk with vanilla flavor. All four products are sold in a 375-mL (12.67-oz) bottle. Additionally, Moostache white and chocolate milks are sold in a 200-mL (6.76-oz) size.

Besides the Moostache milks, Natrel also uses the Serac system for three milk shake drinks based on Hershey® candy bar flavors. Natrel is licensed by Hershey Canada to use the Hershey brand names. The shakes are sold in the same 375-mL bottle, but the fill is only 350 mL. The extra bottle space allows consumers to shake the bottle and create a foamy shake.

Moostache bottles are molded with a "wavy design that represents a splash of milk," says Diane Jubinville, Natrel's director of public relations. Bottle molds are custom to Natrel.

Duopac (Vaudreuil, Quebec) supplies the extrusion blow-molded bottles. They weigh 28 g, stand 7" high and have a 33-mm finish. Bottles are tinted white for Moostache 2% white milk, Caf/ au lait and vanilla flavors. A brown-colored bottle is used for Moostache chocolate milk and the Hershey milk shakes.

Sterile environment

Serving as systems integrator for the Natrel single-serve aseptic line was Newmapak Ltd. (Longueuil, Quebec). For this application, Newmapak served as the distributor for the Serac system, as well as the bottle unscrambler, rinsers and capper on the line.

Essentially the line is divided into two rooms: a Class 10ꯠ "gray room" for unscrambling and bottle rinsing, and a Class 100 "white room" that houses another rinser as well as the monobloc filler/capper and an induction-sealer. Fill speeds are 300 bpm. The line operates one shift, five days/week and is cleaned every night and sterilized each morning before the equipment is started up.

"All filling equipment and piping is sanitized," explains Jacques Richard, director of assurance and quality control for Natrel. To further prevent bacteria, only one person works in the air-conditioned white room, and that employee must shower and be covered from head to toe with cap, gown and facial mask before entering the sterile environment.

Coming clean

At the St. Laurent plant, bulk bottles are received in gaylord corrugated containers. Bottles are automatically dumped onto a conveyor that delivers them to the hopper of a Posimat (Miami, FL) Series 30 bottle unscrambler that uprights bottles and sets them single-file onto a discharge conveyor.

Bottles are conveyed through a wall into the gray room where they are sterilized. A Perrier (Le Cheylard, France) MFL 30/6 rotary rinser inverts them and washes the exterior and interior with a solution that contains 97% water and 3% oxonia active. The chemicals include hydrogen peroxide, peracetic acid and a "stabilizer."

"The Serac system effectively destroys bacteria," notes Jacques Poulet, quality control supervisor at the plant. The rinser discharges bottles upright onto a conveyor that carries them into a Serac sterilization tunnel. In the tunnel, bottles are overfilled with the oxonia solution. Bottles stay in the tunnel for two minutes at 140°F. The tunnel holds 600 bottles, enabling it to keep the downstream filler operating at its 300 bpm speed.

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