When it comes to industrial packaging, the quality of the final bag depends not only on the packaging machine. One element that is often underestimated, but crucial to the stability and aesthetics of the packaging, is the film.
At VAI, every project starts with a thorough analysis of the interaction between film, product and format. This is because even a slight variation in material characteristics can radically change the end result: from the shape of the bag to its resistance during handling.
Why film is a strategic variable in packaging with packaging machines
The film is not simply a "wrapper." It is a technical component that works in synergy with the machine and the product. Its stiffness, elasticity and thickness directly influence:
- The ability of the bag to maintain shape
- The sealing of welds
- The resistance to impact and stress during transport
- Aesthetic appeal on the shelves
This means that choosing the right film is not an aesthetic decision, but an engineering choice that impacts logistics, costs, and brand perception.
Stiffness, elasticity and thickness: three parameters that change the final result
At the packaging stage, the behavior of the film varies depending on the packaged product. For example, a flour with low density will fill the bag differently than a compact granular.
A stiffer film will offer greater vertical stability, useful for large palletized bags, while a more elastic one will be ideal for products subject to volume changes or where the required speeds are higher. It all depends on the properties of the plastic material.
Theinteraction between product and film in vertical packaging machines
The same type of film, used on two different formats, can produce unexpected results. This is where the 3D simulations and pre-tests that VAI performs in-house come in.
By pre-sampling the product, we can measure the actual density and predict how the film will perform under vacuum or standard packaging. This process minimizes the risk of having to redesign mechanical parts or formats that have already been started.
Read our in-depth article on how a custom format is born.
From pre-testing to production: a crucial step
At VAI, before moving on to final production, we invite the customer to participate in a pre-test at our facility. Here, the bag is made from the chosen film and filled with the actual product to verify:
- Stability of bag on pallet
- Aesthetic proportions
- Sealing of welds
- Any dimensional changes after vacuuming
This step is critical to ensure that the packaging machinery and packaging material work in perfect harmony.
Choosing the right film means ensuring more stable, secure and attractive packaging. In a market where detail makes all the difference, investing in the right combination of product, machine and material can be the decisive lever to increase efficiency and competitiveness.
If you want to optimize your packaging process, contact us now through the contact page and find out how we can help you identify the best solution for your needs.
