Industry News

Many of the supermarket non-woven bags, gift packaging non-woven bags, etc. that we use every day are made of non-woven fabric. So, how is this lightweight, strong and durable non-woven bag produced? This article will reveal for you the selection of substrate, flexo printing, bag making these 3 non-woven bag production process.

CI Type Flexo Printing Machine for Non-Woven Garbage Bags

How to Choose Substrate

Selecting the right substrate for the entire production process of non-woven bags is the first step to ensure the quality and effectiveness of use. The selection of substrate material is mainly from the type of material, grammage, process type and other aspects to consider.

Type of Material

Polypropylene (PP) is favored by most non-woven bag manufacturers due to its low cost, high strength and low wear properties. It is the most common non-woven bag material on the market and is suitable for making ordinary non-woven bags for daily use such as shopping non-woven bags and grocery promotional non-woven bags.

Polyester (PET) has good strength and heat resistance. It is very suitable for non-woven bags that require higher load-bearing capacity or high temperature environment, such as take-away food packaging non-woven bag, fruit and vegetable non-woven bag, etc.

Wood pulp, cotton, viscose and other biodegradable materials have better environmental performance. They are suitable for the production of eco-friendly non-woven bags and other non-woven bags with high environmental requirements.

CI Drum Flexo Press for Raw Material Cement Non-Woven Bags

Grammage

The thickness of non-woven fabrics is generally measured in grams per square meter (g/m²). 70g/m², 80g/m², and 90g/m² non-woven fabrics are the most common. The thickness, cost and durability of nonwoven fabrics increase with the increase of grammage. 70-100g/m² nonwoven fabrics are more suitable for advertising non-woven bag, supermarket carry non-woven bag and storage non-woven bag.

Process Type

According to the use of non-woven bags to choose different processes made of non-woven fabric.

Spunbond nonwoven fabric is characterized by low cost and high air permeability, which is suitable for shopping bags such as high-volume snack non-woven bag and T-shirt packaging non-woven bag.

Hydroentangled nonwoven fabric has soft handfeel and high strength, suitable for jewelry non-woven bag, luxury non-woven bag and other high-end product packaging bags.

Needle punched nonwoven fabric is thick and wear-resistant, suitable for chemical organic fertilizer packaging non-woven bags, wheat flour non-woven bags and other agricultural packaging bags, industrial packaging or heavy duty bags.

Stack Type Flexo Printer for Feed Corn Grain Non-Woven Bags

Flexo Printing Notes

The help of flexographic printing machine can greatly enhance the brand value and product added value of non-woven bags. Flexo printing machinery has high printing precision and fast speed, but at the same time, we should also pay attention to the following details that are easy to overlook.

The Flatness of Non-Woven Surface

Flexographic presses are suitable for printing on nonwoven fabrics with flat surfaces and light colors, especially flat white or light-colored nonwoven materials with better results. Flexo presses are prone to the problems of unsatisfactory color and poor coverage when printing light colors (e.g., white, yellow) on dark-colored nonwoven fabrics.

Central Drum Flexographic Printer for Coffee Bean Non-Woven Bags

Ink Selection and Blending

Flexography machine usually use environmentally friendly odorless water-based inks that meet green standards. When flexographic printing on non-woven fabrics, it is necessary to pay attention to the viscosity and dryness of the ink to avoid the problem of unclear printing or incomplete drying.

Suitable Printing Pressure and Speed

Excessive printing pressure will cause the pattern of non-woven bags such as dry goods non-woven bags and cosmetics non-woven bags to deform.; while too little pressure will lead to uneven inking; too fast printing speed may affect the drying effect and need to be adjusted according to the actual situation.

Color Fastness Test

After flexo press printing, the printed nonwoven fabrics should be tested for friction fastness in time to ensure that the pattern is not easy to fall off and meet the requirements for the use of feed corn grain woven bags, perfume nonwoven bags and so on.

Central Impression Flexographic Machine for Chicken Feed Packaging Non-Woven Bag

How Substrate Becomes a Bag

The production of non-woven bags is the process of processing the non-woven fabric substrate rolled after flexo printing into bags through a series of process steps. At present, the production of large quantities of non-woven fabrics such as vegetables agriculture non-woven bags, coffee beans non-woven bags, clothing gift shopping non-woven bags, etc. on the market generally uses a fully automatic mechanism molding method.

Sugar Packaging Non-Woven Bag Making Machine of Sahil Graphics

Material Feeding: Install the non-woven fabric roll after flexographic printing on the bag making machine.

Folding: The bag making machine automatically folds the fabric in half or folds the edge to form the bag structure.

Ultrasonic Sealing: The sides and bottom of the bag are hot-pressed and bonded through ultrasonic welding technology without sewing thread.

Punching & Handle Attachment (optional): Automatically punch holes and install handles according to the bag shape.

Cutting & Forming: The machine automatically cuts out the shape of the bag.

Counting & Stacking: The finished products are automatically counted and stacked for easy packaging.

Pet Food Packaging Non-Woven Bag Making Machine of Five Fingers Exports

Through the above detailed introduction to the production process of non-woven bags, we believe that as a non-woven bag manufacturer, you have a clearer understanding of each part of the substrate selection, flexo printing, cutting methods and molding techniques. In fact, non-woven fabric can not only be used to make non-woven bags such as perfume non-woven bags, but also bed sheet, disposable face masks, surgical gown, disposable bath towel and other products. Their production process has similarities. We hope this article can provide you with valuable reference in the production of non-woven bags or related products.