Laminating film for protection, looks and feel
In the paper and packaging industries, laminating film is applied on surfaces like paper and cardboard to enhance protection, improve appearance and create haptic properties contributing to the ´feel´ of surfaces. Lamination can be done with either wet or thermal laminating film which are suitable for specific applications as you will find out later in this article.
Wet and thermal laminating film
Lamination exists primarily as two different processes which both use special films made for them: wet lamination and thermal lamination. Here we will take a closer look at the wet lamination and thermal laminating films.
Thermal laminating film – Dry bonding
A thermal laminating film (also known as hot film) is coated with an adhesive or resin which has a low melting point. This allows the film to be applied using merely heat and pressure. These films use dry bonding, meaning that the adhesive is activated prior to combining the substrates to be bonded.
Thermal laminating films are available in different finishes ranging from matte to high gloss depending on the material the film is made of. Thermal films exist as BOPP and PET films , as will be explained later on. Thermal lamination films are used for example to laminate book covers, magazines, diaries and other printed and unprinted paper products.
Wet lamination films – Wet bonding
Wet lamination films are used for laminating two substrates, of which one is porous. Also wet lamination films exist as BOPP and PET films. The wet films are suitable for conventional lamination done with dispersion, solvent-based, UV or hotmelt adhesives. The final wet bonding takes place as the substrates are brought together and the adhesive between them is let cure.
These films often have excellent anti-static properties and they are suitable for high speed lamination. Wet laminating films are used for carton and paperboard lamination as well as printed and unprinted paper.
Materials that make up the laminating films
Laminating films used in the paper and packaging industries come in three types: BOPP, PET and nylon. These three differ from each other when it comes to the applications, price and finish. Our experts can further help you choosing the best solution for your packaging!
BOPP – Biaxially oriented polypropylene
In BOPP laminating films, the base material is biaxially oriented polypropylene. The lamination is realized by extrusion coating an adhesive on the film and either wet or dry bonding it to the substrate. The film has the properties of a BOPP film on wide side, and the those of the adhesive on the other.
BOPP films are available in various shades and finishes such as matte, silky satin and high gloss. The film contributes to the finished product´s looks and feel. The film creates and excellent moisture barrier which is resistant to chemicals.
PET – Biaxially oriented polyethylene terephthalate
Another popular, yet little more expensive laminating film is based on biaxially oriented polyethylene terephthalate – PET. These films are also known as polyester laminating films. The PET film are generally used for two-sided printing.
PET films are available as matte and gloss finishes. They are used for instance for menu cards and identification cards with magnetic strips.
Nylon – Biaxially oriented nylon-6
Compared to BOPP and PET films, the nylon films are more expensive. However, they have unique properties such as abrasion resistance and are therefore used for example for book covers and jackets. Nylon films are a type of thermal lamination film applied through dry bonding.
Choose the best laminating film for your product
The lamination films are divided into groups by the process (wet and thermal film) and by their base materials (BOPP, PET and Nylon). However, within these group there are numerous different types of products which all have their special properties. Therefore, choosing the best laminating film for a specific project is not an easy job.
When choosing a laminating film, consider the following:
- Environment: the laminating film will be directly exposed to the environment in the finished product whether it is the cover of a book or a package for perfume. Therefore, for example the exposure to sun, chemicals and heat should be considered.
- Ease of lamination: when it comes to ease of lamination, the thickness of the film plays a great role. Thick films are often used for laminating graphics which need to lay flat and remain so. In turn, thin films are preferred on curved and uneven surfaces.
- Quality of the film: it goes without saying that investing in good quality is costly. However, in laminating films, high quality is worth every penny, as a poor quality film can damage the product rather than protecting it.
- Adhesive: the adhesive of laminating film affects the appearance of the finished products. It is also the substance in direct contact with the substrate. Therefore, the adhesive should be chosen based on the desired looks and the requirements of the substrate.
Need help finding the right lamination film?
In case you are unsure which lamination film is the best for your product and process, do not hesitate to contact us. Our experts are happy to share their expertise with you, and help you find the system that benefits your product the most.