How to Use Polypropylene Wax for Improved Printability in Packaging Films

Polypropylene wax is a versatile material that is used in a variety of packaging films, including food packaging, industrial packaging, and pharmaceuticals packaging. It is a modified form of polypropylene that has excellent printability and slip properties, making it an excellent choice for modern packaging films.

But, how do you use polypropylene wax for improved printability in packaging films? In this article, we’ll explore the benefits of using polypropylene wax, how it improves printability, and a step-by-step guide on how to use it.

Benefits of Polypropylene Wax

Polypropylene wax is a modified polypropylene that has been processed to have a lower molecular weight. This makes it more malleable and easier to process. It has several benefits, including:

1. Improves printability: Polypropylene wax enhances the printability of packaging films by making it easier to print clear, crisp images. It provides a smooth surface that prevents ink from smudging or bleeding.

2. Improves slip properties: Polypropylene wax reduces the coefficient of friction, making it easy to handle and process the packaging films. This reduces the likelihood of film sticking to machinery during processing.

3. Improves heat-sealing properties: By reducing the melting temperature and increasing the time window for heat sealing, polypropylene wax ensures strong and consistent heat-sealing properties.

4. Improves stiffness: Polypropylene wax enhances the stiffness of films, improving their ability to protect and transport products without failure.

5. Improves moisture barrier properties: By improving the surface energy of packaging films, polypropylene wax increases their moisture barrier properties, making them ideal for packaging moisture-sensitive products.

How Polypropylene Wax Improves Printability

The printability of packaging films is a critical factor in the packaging industry. It determines how products are marketed and their appeal to consumers. Polypropylene wax improves printability in the following ways:

1. Improved ink adhesion: Polypropylene wax has a high surface energy, which improves the adhesion of inks to the film surface. This ensures clear and vibrant images.

2. Reduced ink bleed: Polypropylene wax provides a non-porous barrier that prevents ink from bleeding into the film. This ensures that images remain sharp and legible.

3. Reduced dot gain: Polypropylene wax’s smooth surface prevents ink dots from spreading out on the film surface. This reduces dot gain and improves image clarity.

4. Reduced static charge: Polypropylene wax’s low static charge reduces the attraction of dust and debris to the film surface. This ensures that images remain clean and sharp.

5. Reduced print defects: Polypropylene wax’s slip properties reduce the incidence of print defects such as smudging and offsetting. This ensures that images are consistently clear and legible.

How to Use Polypropylene Wax for Improved Printability

Polypropylene wax is easy to use in packaging films. Here are the steps to follow:

Step 1: Select the Right Grade of Polypropylene Wax

Polypropylene wax is available in different grades, each with its own specific properties. You should select the grade that meets your specific application requirements. Consult with your supplier to ensure you choose the right grade.

Step 2: Add the Wax to the Polymer Melt

Polypropylene wax is typically added to the polymer melt during processing. The amount added will depend on the specific grade used and the desired properties. As a general rule, the amount added should be between 1 to 4%.

Step 3: Mix the Wax and Polymer Melt

Once added, the wax and polymer melt should be mixed thoroughly to ensure even distribution of the wax throughout the polymer. This can be done using mechanical agitation or other methods.

Step 4: Process the Polymer for Film Extrusion

After mixing, the polymer should be processed using standard film extrusion techniques. The processing conditions will depend on the specific polymer and extrusion equipment used.

Step 5: Perform Testing

Once the film is produced, it should be tested to ensure that the desired properties are met. This can include testing for printability, slip, heat-sealing properties, stiffness, and moisture barrier properties.

Conclusion

Polypropylene wax offers a range of benefits to packaging films, including improved printability, slip properties, heat-sealing properties, stiffness, and moisture barrier properties. By following the simple steps outlined in this article, you can use polypropylene wax to improve the printability of your packaging films and achieve clear, vibrant images. Contact your supplier today and ask them how polypropylene wax can benefit your packaging applications.