What is a Back Seal Bag?
A back seal bag is a type of packaging bag that is sealed along the back side of the bag body, leaving no seals on the sides. This allows the sides of the bag to withstand greater pressure, reducing the likelihood of packaging breakage. In terms of design, it also ensures that the pattern on the front of the package is complete. The application range of back seal bags is very broad; they are lightweight and not easily damaged.
Back seal bags are also known as pillow-shaped bags. These bags have rear, top, and bottom seams, giving them a pillow-like shape. Many small food packages often use pillow-shaped bags. The rear seam of a pillow-shaped bag forms a fin-like seal, in which the inner layers of the film are sealed together, and the seam protrudes from the back of the sealed bag. Another type of sealing is the overlap seal, where the inner layer of one side is bonded to the outer layer of the other side, forming a flat seal. Since the "fin" type seal is relatively strong and requires only the inner layer of the packaging material to be heat-sealable, it is widely used. In contrast, the "overlap" type seal is relatively less strong and requires both the inner and outer layers of the bag to be heat-sealable materials, so it is not used as much. The top and bottom seals are formed by bonding the inner layers of the packaging bag.
Advantages of the back seal bag Structure: Continuous patterns, high pressure resistance, less prone to damage, lightweight.
Suitable Products for back seal bags: Instant noodles, dairy products, puffed food, candy, and snacks.
Advantages of Xlentpac Back Seal Bags
Pre-made back seal bags
Pre-made back seal bags are bags that are pre-manufactured, filled with product, and then heat-sealed at the top. This method is ideal for companies seeking simple and efficient packaging solutions. Moreover, the dimensions and quality of Xlentpac's pre-made back seal bags are consistent, making them perfect for small and medium-sized enterprises that need reliable and easy-to-use packaging options.
Automated Packaging Rolls
For larger-scale operations, using rolls on automatic packaging machines is an efficient option. The machine wraps the product with film while forming the bag, simplifying the packaging process. This method allows for high-speed production, suitable for companies with large packaging needs and a focus on operational efficiency.
Ensuring Food Safety
In the food industry, packaging serves not only to protect and preserve the product but also plays a crucial role in ensuring consumer safety. Back seal bags are a popular choice for food packaging due to their versatility and efficiency. However, one of the most critical aspects of these bags is their compliance with food safety standards. The innermost layer of back seal bags is typically made of polyethylene (PE), a material known for its safety and suitability for direct contact with food. PE is a non-toxic, inert material that does not react with food substances, ensuring that the contents are uncontaminated and safe to consume. This makes PE an ideal choice for the heat-seal layer in back seal bags, providing a secure and reliable seal while maintaining the safety of the internal food.
