- Contract Packaging
- Leaders in Packaging
Article | September 30, 1998
Bringing a glacier to the consumer
On Vancouver Island, a brand new PET bottling line fed by an in-line stretch blow-molding machine is packaging right from a glacier some of the purest water on the planet.
There's nothing like having a clean slate when it comes to planning a new bottling line. Just ask Andre Radermaker of Natural Glacial Waters a startup bottled water marketer based in Vancouver British Columbia Canada. Radermaker is operations manager at the firm's newly built production facility on Vancouver Island near Fanny Bay.
"Many times a bottling line has to be designed for an existing structure you move into and adapt for your purposes" says Radermaker. "But this building was designed and built specifically for in-line blow molding and filling of PET containers. From a sanitation standpoint it's exactly what you want.
"The filling room has a two-percent slope to the drain for quick sanitary drainage of water. Corners are rounded where the wall meets the floor to make cleaning easy and effective. And throughout the building an epoxy finish makes the floor easier to clean and seal against contamination compared to concrete or other surfaces."
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This passion for perfection is driven partly by the firm's belief that it is marketing some of the purest water on the planet. The source for NGW's Névé brand is a glacier while the Canada Icefield brand comes from a snowcap mountain range.
All the equipment in the integrated blow-and-fill line is brand new from the Krupp Corpoplast reheat-and-blow system at the front (see Packaging World September '98 p. 34) to the pallet wrapper at the end. Prodigious speeds however took a back seat in the design and layout of the line which is built to blow mold and fill no more than 120 bottles/min. Management views this line essentially as an opportunity to perfect the art of blow molding and filling in-line on a modest scale. Then the company plans to use the experience gained to build faster lines that run just as smoothly in the same plant.
Bottles are produced in four sizes: 500- and 710-mL and 1- and 1.5-L. NGW buys preforms from two vendors currently but management is actively exploring the installation of its own injection-molding equipment.
Bottles move from the blow molder directly to the filler via an air conveying system from Conveyor Systems Inc. (Sanford FL). From framework to air-flow manifold to neck-ring supports the system is solid stainless steel. That sets it apart from comparable systems which typically incorporate components made of plastic or other flexible materials. Says Conveyor Systems' Tom Barfell "Workers in canning and bottling plants have a tendency to crawl all over a system like this. If it's made of stainless steel it can stand up to that kind of abuse."
The air-flow manifold along which bottles move is 8" in dia and stretches about 120'. Inside bottle neck rings are supported on stainless-steel brackets. Air directed at bottle sidewalls propels the bottles forward. Regulating valves operated manually allow adjustment of air flow every 2' along the length of the manifold. This results in less surging and an overall smooth transport.
Because the air blown at the bottles is directed well below the bottle finish chances for contamination are greatly reduced. "In our QC lab we do swab tests of bottles before and after they are conveyed down the track and we see very little contamination pickup" says Herman Poon vice president of business development at NGW.
One feature especially useful on a line where any one of four bottle heights may be in production is the hinged discharge section. A single operator using a hand crank can raise or lower this 5'-long section when bottle height changes. It gently deposits the bottles single-file on a tabletop conveyor leading through a glass wall into the filling room. Measuring about 12' x 15' the glass-enclosed filling room is overpressurized with HEPA-filtered air to help keep contamination out. An added sanitation measure is a ceiling-mounted filter equipped with an ultraviolet light that kills airborne bacteria.
Occupying most of the filling room is a monoblock rinser/filler/capper from Ave an Italian manufacturer represented in the U.S. by Horix (Pittsburgh PA). It consists of 24 rinsing stations 24 filling stations and six capping stations.
"We like it for its small footprint reliable bottle transfer features and solid reputation" says Radermaker. "Also with the four bottle sizes we produce quick-change capability was important. There are a few parts to change at the front end starwheels and guides mostly and that's it."
The rinser rinses with ozonated water "currently considered one of the most effective rinses available" says Radermaker. Soon to be added to the filling room is one more sanitizing device a sterilizing UV tunnel through which threaded closures will pass on their way down from the overhead hopper. "We believe all components must undergo some form of sterilization" says Radermaker. Both sport cap and conventional threaded closures 28 mm for all four bottle sizes are used.
Gamma ray detection
When bottles exit the filling room they pass through a fill-level detection system from Peco Controls (Milpitas CA). Relying on gamma- ray technology it sends a low-level energy pulse through the bottle. If a receiving sensor on the other side registers the wrong density level it means the fill level is incorrect so the bottle is automatically rejected. The Peco system also uses photoelectric sensors to detect and reject bottles with cocked or missing caps.
On their way to the labeling machine that's next in line bottles are conveyed past an Alvey Systems (St. Louis MO) accumulation table. It provides about four minutes of accumulation time when the small 500-mL bottle is running and about two minutes on the 1.5-L size.
Labeling is done on a roll-fed unit from B&H labeling (Ceres CA). An incoming bottle is detected by photocells and causes the label feed to advance label material. The label cutter is driven by a servo motor whose encoder tracks precisely where the motor shaft is in its 360° revolution. The position of the shaft is relayed to a motion controller from Ormec (Rochester NY). With this information the motion controller "knows" when to signal the cutter to cut a printed label from the roll in register.
Once cut from its roll the label is transferred onto a vacuum drum and a small seam of hot melt glue is applied. The vacuum drum rotates to apply the label to an incoming bottle and the label is rolled onto the container.
Supplied by MRI Flexible Packaging (Newtown PA) the labels comprise a 1.1-mil white polypropylene surface-printed in seven colors with an adhesive lamination of 0.5-mil clear PP that traps and protects the ink.
"Many water bottles out there have glue-applied paper labels" says Radermaker. "With these roll-fed film labels there's no color fade and no susceptibility to moisture damage." The labels also are easily removed adds Radermaker which makes them more suitable for bottle recycling.
Radermaker concedes that MRI's Pennsylvania location makes them something less than neighbors. "But they're a proven manufacturer and they're large enough so that we can count on them when we grow" says Radermaker. "We have bold expectations and we want to align ourselves with suppliers we think can keep up with our growth."
Labeled bottles pass through a Solo 5 ink-jet coder from Domino Amjet (Gurnee IL). The year month day and time all are printed on the bottle shoulder.
Fork in the line
Next bottles can be sent down one of two paths for secondary packaging. For customers who want corrugated shippers a case erector and drop packer are planned. For customers not interested in that