As you know, non-woven bag manufacturers are different from one another. When it comes to non-woven bags manufacturing, the process usually differs from non-woven bag manufacturers to another. There are different materials used as raw materials. And not just any type of raw material will do! If you want to learn the process of each of these processes, which raw materials work best for each, and the finishing process for non-woven cloth bags, read on!
Types of Non-woven Bags
There are three major types of non-woven bags. The first is sometimes called a laminate or blend, which is essentially a blend of fibers that produces a very strong, durable bag. The second type is an ultra-low density bag, which can be made out of 100 percent polyethylene (PE) fibers and has a much higher density than the first type. And the third type is sometimes called a high-density bag, which can be made out of 100 percent PE fibers and contains even more material than the ultra-low bag.
Raw Materials Required for Manufacturing of Non-woven Bags
The main raw material required for manufacturing of non woven bags is Polypropylene (PP). It is a thermoplastic polymer that is derived from petroleum. PP makes up the body and bottom lining of the non woven bag.
The second raw material required for manufacturing non woven bags is Polyethylene Terephthalate (PET). PET is a thermoplastic polymer that is derived from petroleum. It is used as the top and side linings of the nonwoven bags.
A third raw material required for manufacturing non woven bags is Polyester Film (PE). It is also a thermoplastic polymer that is derived from petroleum product. PE film acts as a barrier between PP layer and the environment. It also provides protection against moisture, oxygen, UV rays and other factors like keeping the bag transparent.
The fourth raw material required for manufacturing non woven bags is Woven Polypropylene (WPP). It acts as the base fabric to make PP layer of the bag.
Process of Non woven Bag Manufacturing
Manufacturing process of non-woven bags:
Step 1. Raw materials— non-woven fabrics (polypropylene, polyethylene, etc.)
Step 2. Cutting—cutting the fabrics into size according to the requirements.
Step 3. Forming— shaping the bags with heat and pressure, embossing the handles into shape.
Step 4. Sewing—sewing the bottom seam of bags and then pressing with steam iron to make sure the seams are flat and smooth. Step 5. Printing—printing the artwork on both sides of bags or printing as required Step 6. Folding —folding the bags according to directions on customers’ order. Step 7. Packaging— packing the finished goods into cartons for delivery to customers
The finishing of non-woven bags involves the application of water-based coatings on the bag. This helps in creating a higher quality for both print and finish. It also allows for better bonding and adhesion of the finished products to other materials, making it more durable. Finishing is also necessary as it helps in providing a high gloss, scratch resistance and overall quality of finish on the bag. There are various processes involved in finishing non-woven bags such as:
Watering Out : In this process, raw materials are processed into a web by applying water pressure onto them. The excess water is then removed from the web with the use of a hydraulic press until only 4% to 5% moisture remains in it. This step leads to more consistent production as well as better dimensional stability and consistency.
The printing process is one of the most important steps in the non-woven bags producing procedure. It is crucial that the ink is applied to the bags in a way that will result in high quality, precise and consistent prints. Our machine uses a patented inline system of precise ink drippers, which are automatically positioned on top of the print head. The ink is then spread over the entire surface area of the bag by a squeegee. The squeegee blades are automatically cleaned after each print run to ensure that no ink smears or clogs occur during the process.
Choosing the right manufacturing type will ultimately depend on a variety of factors—the most important of which are your product and your goals as a company. This quick overview of manufacturing options won’t provide every answer, but it should provide you with a good launching point for developing effective strategies in your own unique situation.