by Simin Xiang
Quick Answer:
The multiwall paper bag consists of multiple plies of kraft paper used for the transportation of industrial powder, granulated material, food ingredients, feed, fertilizer, and related materials. PE liner, coating, or aluminum barrier can be included in addition to kraft paper when required by the product. The best choice of multiwall paper bag is dependent upon weight, particle size, water sensitivity, filling machinery, transport, and closures of the products. The number of plies is just one of the factors affecting the performance of the bag. Multiwall paper bags produced by XIFA Group include up to 4 plies of kraft paper. The types of structures are PE liner, PE coating, and aluminum barrier.
Contrary to the general single-wall paper sack, the multiwall version consists of several layers of paper to form an industrial package. Each layer may have a structural or protective function.
XIFA manufactures 2- to 4-ply kraft packages. The required number of layers depends on the filling weight, density of the product, handling, and transportation process. The extra layer is not always needed. The paper basis weight and strength of each layer will play a role as well.
Simple multi-ply kraft can be used for many dry products. Products that are moisture-sensitive, oily, or fine may require a secondary barrier.
A PE liner will help protect from moisture and sifting. The liner can be useful for fertilizers,chemicals, food ingredients, and other products that need protection from external moisture. The PE-coated paper is another choice for storing or transporting products sensitive to moisture.
The aluminum barrier constructions offer better protection from moisture, oxygen, and light. These barriers are preferred when the product is sensitive or powder-like. Selection of barriers should be made based on exposure requirements. Unnecessary layers do not add value to the packaging.
Closure impacts the rate at which the packaging is filled, dust control, the seal, and the form of the pallet.
The valve bags can be filled using a corner hole with the appropriate filling machine. XIFA provides the valve bags for paper and for use in automatic filling systems. It will be easier to fill them with a clean appearance because the main bag is closed during the process.
The pinch-bottom bags may offer a clean, sealed look and also be used in the filling process with the appropriate automation.
The sewn bags will be ideal in cases where the open mouth needs to fill up the material before sealing it. The sewing, paper, and the sifting control will have to be suitable for the product.
Every design answers a particular packaging challenge. Here are a few to consider.
| Packaging | Main strength | Barrier level | Typical fit |
| Multiwall paper | Printability and structured stacking | Adjustable with liners | Powders, feed, ingredients |
| PE bag | Moisture protection | High | Moisture-sensitive products |
| PP woven bag | Tear and handling strength | Can be laminated | Fertilizer, feed, minerals |
| Paper + barrier | Paper exterior with added protection | Medium to high | Sensitive powders |
Paper, PE, PP woven, and mixed packs are the products of XIFA. Therefore, material selection is based on the product being packed, and not vice versa. For packing products that range between 25 kg and 50 kg, and whose purpose is for industrial use, customized XIFA paper bag quotations can be made available.
An RFQ will allow the supplier to design the bag around the filling line and logistics conditions.
| RFQ item | Information to provide |
| Product | Powder, granule, feed, chemical, food ingredient |
| Fill weight | For example, 25 kg or 50 kg |
| Dimensions | Width × length × gusset |
| Paper | Ply count and GSM |
| Barrier | None, PE liner, coating, or aluminum |
| Closure | Valve, pinch-bottom, sewn, or other |
| Printing | Artwork, colors, print sides |
| Filling | Manual or automatic |
| Quantity | Order volume and annual forecast |
| Logistics | Destination and storage conditions |
Other good multiwall paper bag specs that may affect bag design include the material’s moisture sensitivity, particle size, and abrasiveness.
Tests should relate to the product and logistics. Checks can be performed for bag size, paper thickness, stitching, printing, filling properties, and shipping strength.
According to XIFA, among the systems that are available in the company that concern management and food safety systems are AIB, BRC, FSSC 22000, HACCP, and ISO-based certifications. It is important to know which certification is needed for the particular product and production order, especially for food packaging. Traceability of production is also important for industrial orders.
XIFA mentions that the usual OEM order amount is about 10,000 paper bags. It has a usual bulk lead time of 15 to 20 days. The exact lead time will depend on the structure, materials, printing, quantity, and production schedule.
The samples need to be verified based on the filling machinery that will use them during bulk production. All dimensions, valves or openings, closure, printing, and barrier structure should correspond to the specification that was approved.
There is no definitive answer to this question. XIFA provides between 2 and 4 kraft layers, depending on load, product, handling, and barrier needs.
Yes, but only if the design incorporates an appropriate PE layer or coating or any other type of barrier. Kraft paper alone offers very little moisture resistance.
Paper bags are made for various capacity filling applications at XIFA. The final structure must depend on the product weight and filling conditions.
Yes, but only if designed appropriately for automated filling lines. It is helpful to have machine specifications or samples of the existing bags.
The right multiwall paper bag combines structural plies, barrier protection, closure, and dimensions around one product and filling process. A detailed RFQ is more useful than specifying capacity alone.
For industrial buyers, the most important details are product characteristics, fill weight, paper structure, liner, closure, printing, filling method, and shipment conditions.
Want to request a custom 25 to 50 kg paper bag quote today? Contact XIFA Group with the required ply count, barrier, closure, and printing specifications.
