Production of weight-optimised oval PET bottles
With preferential heating KHS provides an energy-efficient method for producing oval PET bottles with an optimised weight. Not only the food industry but also consumer goods manufacturers such as Henkel are opting for this technology. It also enables complex containers to be economically produced in house, with no need for external procurement. At its facility in Wassertrüdingen, Germany, the concern has now invested in a KHS stretch blow moulder featuring the new technology for its Fa body care brand. Reducing the bottle weight while simultaneously increasing the percentage of recyclate used in the packaging were the key factors that influenced Henkel’s decision.
Henkel has relied on stretch blow moulding technology from KHS for decades. The Dortmund system supplier’s Blomax machines with preferential heating are used to make containers for fabric softener and household detergents in the company’s Laundry & Home Care business unit worldwide – and in Germany now also for shower gel. Thanks to proven KHS technology and a capacity of up to 21,700 bottles per hour, Henkel’s production processes are now even more efficient. The company also benefits from a more flexible logistics setup, confirms Björn von Lengerke, global product account manager at KHS. “You can make the respective containers for the various products yourself. This makes production plans more flexible.” At the same time, fewer resources are used as trucks no longer have to travel lengthy distances – an important consideration when it comes to climate protection
Reduced weight and use of recyclate
KHS is helping to make Henkel’s portfolio more sustainable. Thanks to the former’s holistic Bottles & Shapes container design consultancy program, the customer’s 250ml bottle now consumes 14% less material than previous versions – while maintaining the required bottle quality. The bottles also consist entirely of recycled PET, with 25% of this what is known as Social Plastic. Henkel has been in partnership with the Plastic Bank social enterprise since 2017. Under this initiative people in Haiti, the Philippines, Indonesia and Egypt collect plastic from the countryside or beach that is then reprocessed. At collection centers the local population can exchange the plastic waste they have amassed for goods, services or even money.
Even with high recyclate contents of up to 100% extremely oval bottles can be formed, according to KHS expert von Lengerke. “In the preferential heating method preforms are first heated in the heater as they rotate. In the downstream section rotation is then stopped, so that only certain areas of the PET preforms are heated further.” A heater box specially designed for this purpose transfers the required heating energy through opposite heater levels. “This optimises the material distribution and stability of the bottle,” von Lengerke continues. This process has various advantages not only in the beauty care range but also when processing cleaning agents, laundry detergents or personal care products that are very often filled into oval PET bottles.
