Strong product protection

The coconut shell is one of the hardest organic materials produced by nature. Inspired by its performance, we continuously invest in the development of innovative packaging solutions that combine strong product protection with excellent environmental sustainability. High-quality sack kraft paper is made from 100% natural fibres from European forests. They give our paper sacks a unique strength, allowing brand owners to optimise packaging weight while still maintaining reliable product protection in a wide range of conditions. The following characteristics – optimised strength, material efficiency and low product loss – improve the environmental performance of paper sacks even further:

  • The sack kraft paper is produced from a high-quality raw material, with fibres from slow-growing trees. This makes the fibres extremely long and strong. A special arrangement of the long fibres in the paper results in a high binding capacity, which gives the sack kraft paper its strength.
  • Thanks to continuous research and development, the strength of sack kraft paper has increased by 45% in recent years. As a result, the amount of paper needed for the same quantity of filling material can be cut by up to 25%.
  • Since sack kraft paper is an elastic material, paper sacks can absorb a certain amount of shocks and bumps without being affected.
  • Paper sacks show low damage rates from point of fill to point of sale, according to the results of a recent investigation conducted by the Swedish research and technology institute Innventia. The product losses that do occur (less than 1–2%) are mostly the result of poor handling practices at retail sites and can be easily avoided by informing and educating the relevant staff.
A securely closed valve

Tight sealing for higher product protection

By paying special attention to clean packaging of paper sacks, the product protection offered by paper sacks can even be raised. The ultrasonic sealing technique ensures that paper sacks will not be contaminated during the filling process and no product loss or dust nuisance will occur on the way from the filler to the customers. It is applicable for valve sacks which are equipped with a short outside valve and a sealable coating on the inner valve. After the filling process, the valve is welded by a tool that is attached to each of the filling machine’s spouts: This ultrasonic closing head pneumatically swivels downward and welds the coated paper valve. This process does not prolong the overall filling speed considerably and results in absolutely tightly sealed and clean sacks.

Further advantages of ultrasonic sealing: Thanks to the self-cleaning effect of the weld zone, no subsequent cleaning systems are required. This allows fillers to save plant parts such as spillage and dust collection systems as well as cleaning sets. Moreover, the improved cleanliness leads to lower wear of plant parts and reduced maintenance costs. Since less cleaning and dedusting equipment is needed, the energy costs are reduced as well.

Besides ultrasonic sealing, there are other measures and actions relevant for achieving a high degree of product protection. To find out more, please see the “Industry Guidelines for dust-free paper sacks”.