3-Side Seal Bags are a type of bag widely used in the food packaging industry. They utilize three sealing edges—top, bottom, and side—to create a stable bag space. This type of packaging has a flat overall structure, presenting a simple and intuitive appearance when unfolded, making filling and placement easier. Common material combinations include PET, PE, VMPET, and OPP, with different base materials used to meet the basic requirements of food products such as barrier properties, transparency, and stiffness. In food-grade applications, 3-Side Seal Bags typically adhere to strict food-grade raw material selection and clean process requirements during production to ensure the cleanliness and safety of the packaged medium. The three-side seal design provides a clear sealing interface at the bag edges, facilitating automated edge trimming and mass production. 3-Side Seal Bags are commonly used in the food industry for packaging powders, small granules, and solid flakes, with their standardized shape making it easier for production lines to automate filling and sealing.

1. Stability

The 3-Side Seal Bag features a three-side seal structure, ensuring excellent flatness and sealing stability. Side seal widths range from 8 mm to 12 mm, meeting food packaging industry standards for edge sealing strength and reducing the probability of cracking during transport. This structure is suitable for multi-layer substrates such as PET/PE, PET/VMPET/PE, and OPP/VMPET/PE, with heat-sealing temperatures controlled between 135℃ and 160℃ to ensure consistent sealing. This structure is ideal for users of high-volume automated packaging as a food-grade flat bag.

2. Economy

The Food Grade Food Packaging 3-Side Seal Bag is a flat bag structure without bottom folds or a stand-up pouch, reducing material waste and lowering the unit consumption per package. Commonly used PET substrate thicknesses range from 12 μm to 20 μm, and PE thicknesses from 40 μm to 70 μm, combined according to common barrier requirements in the food industry. This structure is also suitable for regular zippers, pocket zippers, or Velcro zippers, allowing users to obtain suitable packaging methods while controlling costs.

3. Multiple Materials

The 3-Side Seal Bag can be configured with PET/PE, PET/VMPET/PE, Paper/PET/PE, or PET/AL/PE structures depending on the characteristics of the packaged food. The moisture permeability of the VMPET barrier layer can be controlled below 2 g/m²·24h, and the oxygen permeability can be as low as 1 cc/m²·24h, meeting the food industry's stringent requirements for moisture and oxygen barrier properties. Multiple material combinations provide different effects in terms of brightness, stiffness, and tactile feel, satisfying diverse customer needs in the food packaging field.

4. Easy Processing

The Food Grade Food Packaging 3-Side Seal Bag structure is suitable for various bag-making machines, with a high pass rate for edge cutting and heat sealing operations. The heat-sealing strength of different materials can reach 15 N/15 mm to 30 N/15 mm, meeting the conventional sealing standards of the food packaging industry. Because the bag body lacks a bottom fold structure, the processing steps are simplified, allowing for batch production speeds of 120 to 180 bags per minute, thus improving production efficiency and delivery time.

5. Customizable

These 3-Side Seal Bags offer a variety of customization options, including size, zipper type, and material composition. Bag width can typically be extended from 60 mm to 300 mm, and bag length from 80 mm to 420 mm to accommodate different food types. Surface treatments include glossy film, matte film, and aluminum foil, with printing precision reaching 150 LPI. Hanging holes can also be added to the bag body. Maintaining food-grade cleanliness standards during processing makes them suitable for food brands with specific requirements for appearance and user experience.

1. Supermarket Food Shelves

Common supermarket products such as powders, seasoning granules, and snacks often use 3-side seal bags as outer packaging. The flat structure allows for horizontal placement or hook display on shelves, improving shelf neatness. The food-grade material combination helps maintain the original quality of the product inside while meeting transportation and restocking needs. It's suitable for brands maintaining standardized packaging during large-scale distribution.

2. Food Processing Plant Packaging Lines

Automated filling equipment in food processing plants generally supports three-side seal bags. 3-side seal bags perform consistently in sealing, positioning, and filling. The bag's rigidity allows for easy insertion via mechanical clamps, reducing filling errors. Combinations of materials of different thicknesses ensure smooth packaging on the production line, increasing daily packaging capacity and supporting mass production goals.

3. Coffee Roasting Workshops

Coffee powder, drip bag coffee, and small-volume bean samples are often packaged using 3-side seal bags for weighing. The VMPET or aluminum foil structure provides the necessary light and oxygen barrier properties, making it easier to retain aroma. The bag body can be customized in size according to weight requirements, facilitating quantitative packaging in the workshop and improving the standardization of packaging.

4. Frozen Food Storage Area

The 3-Side Seal Bag can be made of PET/PE or PET/AL/PE, ensuring the bag remains non-brittle and leak-proof at low temperatures, suitable for frozen fruits, small packages of meat, and other products. The bag body can withstand storage environments as low as -18°C, maintaining a sealed integrity during handling, facilitating the repackaging and placement of cold chain products.

5. E-commerce Food Packaging Warehouse

Many small-packaged foods require standardized packaging in e-commerce warehouses to adapt to express delivery. The 3-Side Seal Bag is flat and compact, effectively reducing volume and increasing packing capacity. The barrier properties of the material maintain the quality of food during storage and distribution, making it suitable as a commonly used food repackaging bag type for e-commerce platforms.