Designed for Singapore resin and hardener customer, we offered vertical 4 side sealing bag packing machine+2piston pump filling system.

1. one piston for resin and another piston for hardener

2. Support film width max 520mm, bag width 100~260mm for 4side sealing bag

3. Automatic drip proof mechanism and heat preservation pipe for liquid packing

A 4 Side Sealing Bag Packing Filling Machine is an integrated automatic packaging device designed to form, fill, and seal pouches with sealed edges on all four sides—top, bottom, left, and right. This machine produces compact, leakproof, and visually neat 4-side sealed bags, which are widely used for packaging powdery, granular, liquid, or paste materials in industries like food, pharmaceuticals, cosmetics, and chemicals.

Core Working Principle & Operational Workflow

The machine combines film forming, material filling, and four-side sealing functions into a continuous automated process, with the following key steps:

1. Film Unwinding & Pre-FormingThe machine feeds a roll of packaging film (commonly composite films like PET/PE, BOPP/PE for barrier properties, or single-layer PE for general use) into the film handling system. The film is guided through tension rollers to ensure flatness and stability. Depending on the model, it can use either a single film roll (folded into a double layer) or two separate film rolls (joined together) to form the basic structure of the bag.
2. Vertical Sealing (Left & Right Sides)The pre-formed film passes through the vertical sealing station, where heat-sealing bars press the left and right edges of the film together. The sealing temperature and pressure are precisely calibrated to the film material, creating firm, uniform vertical seals that prevent material leakage and lay the foundation for the 4-side sealed structure.
3. Material FillingAfter the vertical seals are formed, the film tube moves to the filling station. The machine is equipped with a material-specific filling system:
   • Auger fillers for powders (e.g., coffee, flour, pharmaceutical powders)
   • Volumetric or multi-head weighers for granules (e.g., sugar, nuts, seeds)
   • Piston or peristaltic pumps for liquids and pastes (e.g., sauce, lotion, liquid medicine)The filled material is delivered into the film cavity through a filling nozzle, with the filling volume controlled by a PLC system to ensure accuracy.
4. Horizontal Sealing (Top & Bottom Sides) & CuttingAfter filling, the film tube moves to the horizontal sealing station. Heat-sealing bars simultaneously seal the top of the current bag and the bottom of the next bag, forming the final two sides of the 4-side seal. Some advanced models integrate vacuum or gas-flushing functions at this stage—vacuum packaging extends product shelf life by removing air, while gas flushing (with nitrogen or carbon dioxide) preserves freshness for food items like snacks and dried fruits.Finally, a cutting blade separates the continuous sealed film into individual 4-side sealed bags, which are then discharged onto a conveyor belt for downstream processes (e.g., labeling, inspection, case packing).

Key Features & Advantages

1. Superior Leakproof PerformanceThe full four-side sealing structure eliminates gaps at bag edges, making it ideal for packaging liquid, paste, or fine powdery materials that are prone to leakage. This sealing design also enhances the bag’s resistance to moisture, oxygen, and external contamination.
2. High Automation & EfficiencyThe machine realizes fully automatic operation from film unwinding to finished bag output, reducing manual intervention and ensuring consistent production speed. Depending on the material type and bag size, the production capacity can range from 30 to 200 bags per minute, suitable for both small-batch customization and large-scale mass production.
3. Flexible Bag Size AdjustmentOperators can easily adjust the length and width of the 4-side sealed bags by modifying parameters on the PLC touch screen, without replacing a large number of mechanical parts. This flexibility allows the machine to handle a wide range of bag sizes, from small sachets (e.g., 5×8 cm for single-dose medicine) to large pouches (e.g., 30×40 cm for bulk food).
4. Food-Grade & Hygienic DesignAll parts in contact with materials are made of 304 or 316 stainless steel, which is corrosion-resistant, easy to clean, and compliant with international food safety standards (e.g., FDA, CE). The filling system and sealing station are designed for quick disassembly, facilitating daily cleaning and sterilization to avoid cross-contamination.
5. Compact Structure & Space-SavingCompared to separate forming, filling, and sealing equipment, this integrated machine has a more compact footprint, making it suitable for workshops with limited space.

Typical Application Scenarios

This machine is widely used across multiple industries for packaging various products:

• Food industry: Coffee powder, tea bags, snack nuts, sauce sachets, dried fruits, pet food.
• Pharmaceutical industry: Powdered medicine, liquid medicine sachets, herbal extracts, medical dressings.
• Cosmetics & personal care industry: Facial mask essence, lotion sachets, shampoo samples, hand cream.
• Chemical industry: Desiccants, detergent powder, fertilizer granules, adhesive pastes.