In the field of nonwoven packaging bag production, the quality of the bag making process directly determines the appearance, texture, structural strength and performance of the finished product. Traditional bag making usually adopts stretch technology, which relies on roller to form animal material. It is simple to operate and low cost. However, the finished products will often appear deformation, size deviation, film coating damage, bearing capacity, and so on. Stretchless bag making process is a kind of refined production process developed for high grade bags, which dispenses with the method of forced pulling. Its core advantage is that the feed is smooth and tension-free forming, which solves many drawbacks of traditional technology and greatly improves the flatness, precision and durability of packaging bag forming. At present, has become BOPP coated feed bags, pet food bags, industrial high-end flat bag standard process.
The most intuitive advantage of stretch-free bag making process is that the finished product is extremely neat and tidy, which completely abandons the the deformation defects of traditional bag making. In traditional stretching techniques, woven fabric is subjected to continuous external force, which causes the warp and weft weaving structures to be forced to stretch and shift, causing the bag body to longitudinal elongation and narrow horizontally, deform as a whole, uneven surface and curved edges. Especially for laminated woven materials, wrinkles, local bumps and surface misalignment occur easily during the tensile process, seriously affecting the product's appearance. flat and tension-free forming is used throughout the non-tensile process, and the material remains in its original stretched state without strain or deformation. packaging bags of the production of smooth and even surface, uniform patterns, straight edges, overall texture exquisite neat, so as to achieve a better brand presentation.
Accurate size and minimum batch error are the core practical advantages of non-tensile technology. Traditional bagging method cannot control the tensile force accurately, the tensile degree of each batch of materials is not uniform, easy to lead to the bag length and width deviation is not uniform. This not only affects product standardization, but also leads to poor compatibility in filling, stacking and packaging. The servo fixed speed control system and panoramic feeding structure are adopted in the tensionless bag. The whole process is fixed speed feeding and synchronous positioning cutting, which completely maintains the original size of the material and is not affected by tensile forces. The mass produced packaging bags are uniform in size and have the lowest error, and meet the strict requirements of industrial standardization, automatic filling and bulk storage.
This process can maintain the structural strength of the packaging bag and greatly improve the durability of the finished product. The tensile and abrasion resistance of woven bags depend on the regularity of the warp and weft structure. Traditional stretching techniques force expands the gap between fabric fibers, destroys the original structural toughness of the fabric, causes the local stress of the bag to be uneven, thebearing capacity to decrease, and crackings, damage and deformation easily after heavy loading. The tensionless process does not damage the structure of the woven substrates. The warp and weft threads are arranged in an even and orderly way, which maximizes the tensile strength and toughness of the raw materials. Finished bag has uniform bearing capacity, tear resistance and abrasion resistance. They are less prone to deformation or breakage when fully loaded, effectively reducing damage to the bags during transport and storage.
For laminated woven bags, the non-tensile process can effectively protect the laminated layer and ensure the protective performance of the packaging. The moisture, dust and freshness of BOPP film coated feed bags and pet food bags depend entirely on the tight cooperation between the film coated and woven layers. During traditional stretching, tension can lead to dislocation and separation between the film covering and braided substrate, causing problems such as bubbles, flaking and edge curling. This directly damages the sealing and protection structure of the packaging bag and makes the feed susceptible to dampness and spoilage. The non-tensile bagging process adopts a flexible and stable mode of transportation without external tearing. The film layer and weaving layers are always tightly bonded, the sealing and barrier are intact, and the moisture and freshness of the packaging bag are guaranteed from the technical aspect.
In addition, the yield rate of non-tensile bagging process is higher and the overall production cost is lower. stretching process has a high defect rate, due to deformation, layering and size deviation, a large number of defective products will be produced. This not only wastes raw materials, but also delays production. The unstretched process has a high degree of automation, stable and controllable process, greatly reduces human error and process defects, and greatly improved mass production. While equipment and process costs are slightly higher, the overall cost-effectiveness far exceeds traditional stretching processes in terms of raw material losses, rework costs, product premiums and other aspects.
In general, the production process of paperless bags can create higher quality packaging by breaking the limitation of traditional ``pull feed '', using the technology logic of stretch free flat forming, and optimizing the appearance, size accuracy, structural strength and protective performance of the products. Whether it is brand packaging that seeks appearance and texture, or heavy-duty feed packaging that requires long-term warehousing and long-distance transportation, non-stretching technology can be perfectly adapted, which is the core trend of high quality production upgrading in the textile packaging industry today.
