Is PP woven bag waterproof?

PP woven bag is a kind of packaging material widely used in agriculture, building materials, chemical industry, logistics and other industries. The main reasons for its popularity are its durability, strong load-bearing capacity and high cost-effectiveness. But many people have doubts when using or purchasing: Is this bag waterproof? What should be paid attention to if the goods are afraid of moisture? This article will talk about the waterproof ability of PP woven bags and several key details worth paying attention to during use.

Is PP woven bag waterproof?

From the material point of view, PP is polypropylene, which does not absorb water. But PP woven bag is not a whole piece of sealed plastic sheet, but a lot of flat wires interwoven, with small gaps on the surface. These gaps allow moisture to penetrate, so the standard PP woven bag itself is not completely waterproof.

In other words, it can be splash-proof for a short time, such as a little rain during transportation, but if it is exposed to a humid environment for a long time, the materials in the bag may still be damp.

How to make PP woven bag waterproof?

The good news is that PP woven bag can achieve good waterproof effect in some ways. Common treatment methods include:

Adding a lining bag or inner film

Adding a layer of PE film or lining plastic bag inside the woven bag is currently the most common and most economical and practical method. Such bags are not easy to get wet and are commonly used to package fertilizers, feed, grain and other products that need to be kept dry.

Laminating

Adding a layer of film, such as PE film or BOPP film, to the surface of the woven cloth can improve the overall waterproofness of the bag, while also improving the clarity of the printing and making the bag more beautiful. Many packaging bags with brand logos use this laminating method, which is not only waterproof but also suitable for outdoor stacking.

Heat-sealing the bag mouth

If long-term sealed storage is required, heat sealing is also an effective auxiliary method. Sealing the bag mouth by hot pressing can further prevent moisture or air from entering and extend the shelf life of the material.

How to choose the right bag for different scenarios?

Different products and usage environments have different requirements for packaging bags. Here are some practical suggestions:

If you only pack some granular or powder products for a short time, ordinary PP woven bags are enough;

If you are packing products that are more afraid of moisture, such as fertilizers, grains, seeds, etc., it is recommended to choose moisture-proof woven bags with inner membranes;

If the products are to be stacked outdoors, or need to be protected from wind and rain during transportation, it is best to choose film-coated ones;

For export goods or situations where high requirements are placed on packaging integrity, it is recommended to use a combination bag type with inner membrane heating and double protection.

What services can we provide you with?

As a professional woven bag manufacturer, we can provide different types of PP woven bags according to your needs, including ordinary type, inner membrane type, film-coated type and various customized printing styles. The product specifications are complete, support rapid sampling and mass production, and are widely used in agriculture, e-commerce, building materials, chemicals and other industries.

Whether you are concerned about the moisture-proof performance of the bag, the appearance display effect, or the overall cost control, we can provide you with a more suitable solution.

Although PP woven bags are not naturally waterproof bags, they can be fully competent for most packaging tasks that require moisture-proofing through reasonable selection and processing. Understanding the material structure and waterproof principle of the bag will help avoid unnecessary problems during use.

If you are worried about choosing a suitable woven bag, or want to customize a waterproof bag that is both practical and beautiful, please feel free to contact us. We will provide you with professional advice and high-quality product support.