Packaging technology for Vinnolit GmbH & Co. KG

High stability with stretch hooding

Vinnolit produces and markets a broad range of PVC products, including PVC for flooring, wall covering, window profiles, pipes, rigid film, technical coatings, automotive sealants, cable sheathing and medical applications. These are suitable for all kinds of PVC applications, e.g., in the building and construction sector, in the automotive industry or in the medical sector. Vinnolit is also one of the leading manufacturers and suppliers of intermediates such as caustic soda, vinyl chloride and tin tetrachloride, which are required in the chemical industry as well as in other industries.

“Some of our PVC powder is filled into paper bags that are then stacked on pallets,” explains Reinhard Birnkammer, head of SCM Polymer. “But due to the different bulk densities of the individual products, the finished stacks are of different heights.” Previously, the company used a shrink wrapping system, which is now outdated and no longer meets the quality standards. “Not only did it take 20 minutes to change the film roll, but the choice of film was also very limited,” says Mr Birnkammer. Moreover, they switched to the BEUMER stretch hood® because of increasingly high standards for the stability of the palletised stacks and the fact that the paper bags are equipped with valves that sometimes ripped holes in the films.

The machine concept of this high-capacity packaging system is flexible and can be adjusted individually to different project situations and applications. “One of the winning arguments for us was the fact that the machine control can automatically detect different stacking heights. We can also choose from a wide range of films, and the PE stretch hood films that are used have a very high breaking strength and piercing resistance,” explains Reinhard Birnkammer. The required elongation values and the biaxial tension forces can be optimally adapted to each product and to the respective operating conditions.

Before choosing the BEUMER stretch hood® S, the head of SCM Polymer and some of his staff members came to visit the BEUMER testing facility in Beckum. “We conducted several test runs and tried different film types, in order to test the securing of loads on pallet stacks of different heights.” These prior tests enabled the company to put the system into operation in Gendorf after only a few days – instead of several weeks. “We could exchange the systems without any problems and fit the new system into the existing conveying technology,” says Birnkammer.

The entire stack is then automatically conveyed to the downstream BEUMER stretch hood® packaging system on roller conveyors. “Our new system is a cost-effective and environmentally sustainable approach to pallet packaging, with low specific energy and compressed-air consumption as well as compatibility with recyclable packaging films,” explains Mr Birnkammer. Furthermore this system does not require complex, energy and cost-intensive hydraulic systems, as is often the case with comparable packaging systems.

While Mr Birnkammer is speaking, the BEUMER stretch hood® is positioning a stretch film hood over the stacked pallet. “An ultrasonic sensor is determining the exact height of the load unit,” Mr Birnkammer explains. “The film hood is sealed and cut at the specific length required for the stacking height.” The stack can have a height of up to 2,200 millimetres. The film hood is stretched horizontally after the sealing and elongation process. The degree of stretch is defined by the stack dimensions, film elasticity and film gusset dimensions and by the required stability of the stack. Motorised rollers – used first to crimp the film – move into position for transferring the film, while gripping the film throughout this movement. The hood is stretched over the entire pallet load and under the pallet – where the rollers and the crimping bows release the film, in a coordinated action, to form the understretch.

Advantages of the BEUMER stretch hood®

In Beckum, Mr Birnkammer learned that stretch hooding has additional advantages compared to shrink hooding. “Not only does it ensure a better securing of loads and offers a higher flexibility, but it also helps us to reduce film consumption by 30 per cent and maintenance costs by 40 per cent.”

“Our cooperation with BEUMER has always been very successful,” Mr Birnkammer sums up their partnership. We achieved our target of better load securing. The company received the certificate for securing loads by Dekra, the largest testing agency in Germany. During one of the tests for this certificate, the stack is tilted by 27 degrees – and still all the bags stayed stable.