When it comes to choosing the best material for polypropylene bags, the decision between double-coated and coextruded can be anything but simple. Both types of materials are widely used to store a vast range of products, from chocolate to biscuits, from pasta to spices, but what are the technical differences between these two types of bags? Let’s find out together.
Double-coated: a more refined appearance and superior protection
Double-coating corresponds to the coextruded material but with a water-based lacquer (acrylic) on both sides: this gives it greater shine, a more effective barrier and greater rigidity. Therefore, a double-coated product is ideal for those looking for a more refined appearance and superior protection for their products. However, this material is sensitive to moisture and low temperatures, so it cannot be used for storing high-moisture products or for freezing.
Coextruded: an alternative for lower temperatures
Coextruded material, on the other hand, has no problems with high-moisture products and is also suitable for storage at lower temperatures: heat-sealed bags can also be used for products to be stored in the freezer. This material is less shiny, less rigid and offers a lower barrier compared to the double-coated one, but it represents a more economical solution.
Practical advice to tell them apart
How can we tell the difference between these two types of materials? The simplest method is to “wrinkle” the bag with your hands, create wrinkles until folds appear on the plastic film: if these folds are white and very evident, it is double-coated, if instead they are visible but not white, it is coextruded. In addition to this simple visual test, it is important to consider the cost of the two materials: the coextruded one has a lower cost than the double-coated one. Therefore, it is essential to check the type of material you are purchasing in order to make informed and advantageous choices.
Choose the right material
In conclusion, both double-coated and coextruded materials have their strengths and weaknesses. Therefore, the choice of the most suitable material depends on the specific requirements of the product to be packaged and the appereance preferences of the customer. Thanks to these simple tips, you will now be able to easily recognize these two types of polypropylene bags and make the choice that best suits your needs. Contact Eurocell for your squared-bottom bags and heat-sealed bags.
