- Contract Packaging
- Leaders in Packaging
Article | July 31, 1996
No-label look hits PET bottles
For 17 years The Body Shop's hair, bath and fragrance products have been filled in HDPE bottles. Now PET is taking over, along with a disc-style closure and a no-label look.
Based in Littlehampton England and represented in 46 countries around the globe The Body Shop is a high-profile skin and hair care products marketer. It's also well known for social consciousness: tests on animals are not allowed and packaging must be of the minimalist variety.
"We've always used packaging in its simplest plainest form so as not to distract from the product and so that from an environmental standpoint we don't use any excess materials" says Witold Brzeski director of packaging at the firm's U.S. headquarters in Wake Forest NC. "But recently we've realized you can be committed to environmental issues and use minimal amounts of materials yet still make your packages very attractive. Besides we've had the same look for seventeen years or so and the market has moved on."
So the firm is in the beginning stages of a sizeable shift from high-density polyethylene to polyethylene terephthalate bottles for its hair fragrance bath and shower products. Leading the way are Canada and the U.S. where 181 SKUs representing some 70% of The Body Shop's sales are now in PET. Other markets around the world are being evaluated but no firm timetable for a switch in packaging materials has been formed.
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"The North American market is more keenly competitive than others and consumers are more demanding" says Brzeski. "We felt we could reap more benefits here that's why we launched the new package here."
Injection/stretch blow-molded by Grafco (Hanover MD) the new bottles come in 2- 4- 8- and 16-oz sizes with 20- or 24-mm neck finishes. Resin is supplied by Wellman (Shrewsbury NJ).
Decorating is decidedly more contemporary as well. The Body Shop has tapped into the popular "no-label look" with a clear pressure-sensitive polypropylene-based label from Sonoco Engraph Label Group (Charlotte NC). The 2-mil stock is printed on a press that combines letterpress and screen printing.
Finally to complete its packaging makeover The Body Shop has discarded its hinged flip-top cap and adopted a custom disc-style PP closure supplied by Seaquist Closures (Mukwonago WI). The Body Shop logo is molded right into it.
Improved performance too
The new packages started shipping in early May from the company's Wake Forest and Canadian facilities. According to Brzeski adjustments to equipment were limited to a few change parts on the cap unscramblers and the King (Chertsey Surrey U.K.) p-s labelers which had been applying a PE film label before the redesign.
While esthetics was the primary driver behind the remake of the package there were performance issues as well paneling or collapse of the bottle's sidewall in particular. The likelihood of this occurring increased as distribution distances grew. Another factor in the materials change was increasing penetration of the Japanese market well known as a zero-defect zone.
Brzeski points to two mechanisms that caused the paneling problems. First the bottle sidewalls were sometimes weakened by certain product components that adsorbed into the molecular chains of the HDPE. PET's structure is inherently more impervious to such penetration.
The other cause of paneling was absorption of headspace oxygen by the product. This created an internal vacuum sufficient to cause paneling. But the PET bottle thanks partly to sidewall structural strength imparted by orientation is better suited to withstand such pressure.
Wall thickness of the new bottles was carefully considered says Brzeski. "We wanted good squeezability for all products regardless of viscosity" he points out. "So we had to select a wall thickness in the middle if you like."
Ultimately the bottles were specified with the following weights and wall thicknesses:
* 2-oz: 8 g and .40 mm
* 4-oz: 12 g and .45 mm
* 8-oz: 21 g and .43 mm
* 16-oz: 35 g and .45 mm
Two features of the custom PET bottle are worth singling out. One is the string of dots molded into the bottle at the shoulder. As in the past The Body Shop encourages customers to bring the bottles back for refills and this mark tells shop personnel how high they should fill the bottle.
The other unusual feature is the etched surface of the bottle. "It's not done with a spray or by means of adding something to the master batch which could affect the bottle's recyclability" says Brzeski. "It's actually done in the mold." While the bottle is still clear the etching gives it a subtle point of differentiation from other health and beauty products in PET containers.
Though typically a bottle made of PET would cost considerably more than one of HDPE The Body Shop was able to keep packaging costs in line. Brzeski explains how.
"We joined forces with The Body Shop in Canada which used to order its bottles independently of us" says Brzeski. "This represented a quantum leap in volume." That in turn brought savings due to economies of scale. "Also" adds Brzeski "the tooling used to produce PET bottles is higher in cavitation than with HDPE and that helps keep unit pricing in line as well."
Overall the company estimates the new packaging costs about 10% more. Part of that is the difference between stock and custom closures. Labels are more expensive too. Formerly printed on a letterpress system they now combine screen printing and letterpress.
"Also adding to the label cost is that we used to order one size label for all four bottle sizes" says Brzeski. "We then imprinted the declared fill on the label as the bottle went through the packaging line. Now we need a different label for each size largely because the bar code is unique for each."
The upcharge associated with the new packaging is justified by the bene