In the bag-making industry, the precision of bag-making equipment directly determines the quality of the finished product, especially the high-precision packaging products such as BOPP bag, feed bag and industrial bag. Bagging equipment on the market is mainly divided into two categories: ordinary stretch bag machine and non-stretch flat bag machine. Many small and medium-sized manufacturers tend to confuse these two situations when choosing equipment, which leads to a series of problems such as bag deformation, size deviation, wrinkle of film and poor carrying capacity. Today we will explain the core definition of the unstretched flat bag maker and analyze the essential difference between it and ordinary bag maker.
Simply put, the Non-Stretching Pocket Maker is a bag-making device designed for high precision machine-knitting, focusing on "zero stretch, high precision, original ecological forming." The equipment dispenses with the traditional drawing and feeding method of bag-making machine and adopts the structure design of uniform buffering, precise feeding and steady feeding. Throughout the cutting, edge sealing and bagging process, woven and laminated fabrics are not subjected to strong stretching, maximizing the longitude, weft density, material material toughness and smoothness of raw material. Mainly used to produce high-quality, high standard industrial woven bags, feed packaging bags, laminated packaging bags and other products.
The core design logic of the device is to solve the production pain point of tension deformation of laminated and high-density woven materials. Ordinary woven fabric is lightweight and high toughness. It is easy to change the original structure of the fabric by the tensile force during the feed of traditional equipment. However, the non-tensile bag-making machine optimizes the mechanical structure, realized the feeding flexibility and uniform forming in the whole bag-making process, eliminated production defects such as lengthening, narrowing, arching and wrinkling, and ensured the uniform size, smooth surface and stable structure of each finished packaging bag.
The key difference between non-stretchable flat bag machine and ordinary bag machine lies in the difference of feed quantity and forming principle. Ordinary bag machine adopts active pull in, relies on the roller to pull the fabric forward, the feeding speed is fast, but the pull force is uneven. During continuous pulling, the warp and weft of woven fabric will be stretched and dislocated, causing the finished bag to elongate lengthways and contract horizontally, causing size deviation and bag inhomogeneity. The servo constant speed feeding+material support platform structure are used in the bag making machine, and there is no forced tension in the process. The fabric is naturally smooth and cropped, completely retaining the initial state of the raw material.
The difference between the two is obvious from the molding effect of the finished product molding effect. There are some problems, such as slight deformation, uneven width, wrinkle of film coating and slant of sealing edge, in the bags produced by ordinary bag-making machine. In the process of mass production, there are problems of large size error and low yield. The tensile strength and abrasion resistance of the bag are decreased directly due to the damage of tissue structure and unbalanced gap between warp and weft fibers. It is easy to crack and deform when the material is overloaded. Flat bag surface is smooth and smooth, no wrinkle deformation, the size error is minimal, the edge sealing is uniform and firm, and the whole molding texture is high level and regular.
The processing adaptability of BOPP coated woven materials is the main difference between the two. It is easy to damage the film coating layer during the tensile process of ordinary bag making machine. During the tensile process, the film coating and weaving layer will be dislocated, blistered and peeled, damaging the moisture protection structure of the packaging bag and greatly reducing the freshness and moisture resistance of the feed bag. No tensile process, no tensile, no deformation, film coating and woven substrates adherent tightly, no layering, wrinkle problem, suitable for the production of thin film coated woven bags. This is also the core reason why high-end feed packaging and branded bags must be made with non-stretchable bags.
In addition, the application scenario and product quality positioning of the two are completely different. The common bag-making machine has low cost and fast speed, and is suitable for producing uncoated, low precision and high versatility. Suitable for packing low-end bulk materials. The non-stretchable flat bag machine focuses on high precision and high quality production, suitable for BOPP laminated feed bags, pet food bags, fine industrial flat bags, export standard packaging bags and other high-end products. The finished product has higherbearing capacity, better protective ability and more regular appearance. The added value of the product is much higher than that of ordinary bag making machine.
All in all, the non-stretch flat bag machine is an upgraded version of ordinary bag machine, which solves the pain points such as the tensile deformation of traditional equipment, poor precision of the finished product, the fragility of film coating and low yield. In the current packaging quality requirements continue to improve the industry, the technology of non-extendable bag has become a high-end woven bag production. Improving product competitiveness and reducing defective product losses is also the core equipment choice of feed packaging and industrial packaging manufacturers.
