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Paper Vs. Woven Polypropylene Valve Bags

Posted by Sonoco Conitex Team on September 24,2019

Traditionally, paper bags have been the industry standard for valve bags. Because paper valve bags are made with layers of paper liners, they are able to breathe both during the filling process and afterward. This enables the air to exit the bag so it doesn't tear while it is being filled.

Updating the Standard

Woven polypropylene (PP) valve bags are the modern update to the standard paper bag. These bags are designed with Microperforations which enables the bag to breathe while limiting the danger of spillage. Additionally, these perforations can be customized to accommodate the size of the specific product that is filling the bag.

Benefits of Using Woven PP Valve Bags

While woven PP valve bags are very similar to the paper option they provide additional benefits that simply aren't possible with a paper bag. Choosing these bags provides the following additional advantages:

  • Puncture Resistant

Whether bags are placed out on display at a retailer or being unloaded on the loading dock, they are at risk for being punctured at several stages of the journey. The woven polypropylene fabric is more durable than paper, and resistant to tears and puncturing. It delivers a stronger packaging solution that exceeds the capabilities of the traditional paper valve bag.

  • Versatile

Woven PP valve bags provide companies with greater versatility across a wide range of industries. From food and spices to sugar grain and pulses, woven PP valve bags are the optimal packaging solution for foodstuffs. Fertilizer, chemicals, seed and animal feed can also be packaged using woven pp valve bags and can even be used as promotional shopping bags.

  • Full Color Printing

While it is possible to print on paper valve bags, doing so often results in tackiness of the paper and paint transfer. Woven PP valve bags, however, can be 100 percent covered with flexographic print, a fast-drying alternative that eliminates paint transfer and the tackiness that is often associated with paper bags.

  • Open Mouth or Valve Top

Woven PP valve bags are available in laminate with both back and circular seam construction. In addition, these bags can be designed with an optional open top. This design is a popular choice for those companies that need pet food packaging.

  • Price Savings

For companies looking to reduce their packaging costs without compromising quality, woven PP valve bags provide them with a value-priced alternative to the traditional paper valve bag.

  • Sonic Sealing

Woven PP fabric has the benefit of being able to be sonically sealed without the need of any additional material. With paper valve bag additional plastic must be added to the spout to be able to accomplish this. By eliminating this need, woven PP bags are the cost effective solution to sonic sealing applications.


  • Range of Fabric Colors

Woven PP valve bags are available in a wide range of fabric colors, From standard white to a company's specific brand colors, the color options are limitless. Bags customized to a company’s brand colors increases product recognition and makes it easier for customers to identify the brand they are looking for. Changing the color of fabric is also a much simpler process than dyeing paper and results in further savings and lower minimum order quantities. Prefer the look of traditional paper bag? Woven PP bags can also be printed in brown, mimicking the look of a paper bag.

  • Additional Features

Companies can easily customize woven PP valve bags to meet their needs. In addition to being available in both valve and open mouth options, these bags can be designed with or without an external sleeve and in a variety of sizes. They can also be coated or uncoated to meet the needs of the company. The valve-style bags are extrusion coated while easy open stitching is also available.

Contex Sonoco is a recognized global leader in the textile packaging industry. Upholding the highest quality standards at its manufacturing facilities, Contex Sonoco has constantly innovated its product offerings to meet the ever-changing needs of its customers. Contact them today to learn more about the advantages of woven polypropylene valve bags and their other forward-thinking products.



Tags: Flexible Packaging

Sonoco Conitex Team

Sonoco Conitex Team