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Packaging Bag Printing – Flexible Packaging Printing Insights

There are two major categories of flexible packaging, namely stretch wrap packaging and various bags. Stretch wrap packaging consists of plastic film that has not yet been formed into the shape of the package, and is simply wrapped around one or more products to be packaged and held in place in some form. Plastic bags are made into a certain shape before the product is put in or when the product is put in. The most common is to heat seal the plastic edge to form this shape. [Packaging bag printing] 1. Stretch wrapping 1) One of the biggest applications of stretch wrapping plastic film in packaging is stretch wrapping, that is, bundling the goods on the pallet together to make them one and enter the circulation. The most commonly used plastic film is low density polyethylene, which is stretched as it is wound around products and pallets, usually helically wound. After wrapping, the film is cut, and the film head is glued to the goods, usually self-bonding. After the stretching force is released, the film is about to return to its unstretched size, creating a binding force that acts on the goods, tying the goods so that they remain stationary when moved during circulation. In addition to the function of bundling, stretch wrap wrapping protects the cargo from moisture, dust, and abrasion. Stretch wrap can also provide this protection for single-variety shipments, as well as bundling together shipments smaller than a pallet load. Although stretch wrap packaging is conceptually simple, its structure is quite complex. For each layer of stretch wrap wrap, the ideal result is to stick to the layers below, but it is not desirable for adjacent potentially shrink-wrapped goods to stick to each other or to other objects they come into contact with. Therefore, a stretch wrap package may have a multi-layer structure, with adhesive added to the inner layer to enhance the bond. In addition to LLDPE, low density polyethylene, polyvinyl chloride, ethylene vinyl acetate and other polymers are also used as stretch wrap films. 2) Shrink wrap Shrink wrap is an alternative to bundled stretch wrap. When the shrink wrap is exposed to a heat source, the originally aligned (oriented) molecules attempt to revert to a lower energy, unstretched random coil structure, the product prevents the film from returning to its unstretched size, and the material acts on the product. force to bind the cargo. Stretch wrap is more common than shrink wrap for bundling goods on pallets because it requires less energy and is more economical. Shrink wrap is more commonly used as baling packaging, where two or more products (same or different) are bundled together rather than a full pallet of goods. Shrink wrap is often used for product protection rather than bundling, with applications ranging from meat to toys. It can be designed to form a tight enclosure around the entire product, providing excellent protection from dirt, moisture and abrasion. Typically, a loose bag is formed before the film is tightly shrunk to the product in the shrink tunnel. LDPE and LLDPE are commonly used materials for shrink film. PVC and PP are used less, as are some special films. Vacuum packaging bags, tea packaging bags

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