side sealing bag making machine
A side sealing bag making machine is a type of bag production equipment where the seal is applied along one or both side edges of the bag, rather than the bottom. This configuration is commonly used for producing pillow bags (flat bags with seals on both sides and the bottom open), side-gusseted bags, and bags that require a wider opening for filling. Side sealing machines are distinct from bottom-seal machines in their sealing jaw orientation and film handling. They are often used for bags that are filled from the bottom (e.g., bread bags, produce bags on a roll) or for packaging where the bag needs to stand upright with a flat bottom (achieved by combining side seals with a bottom fold). Side sealing bag making machines operate at speeds of 150-250 bags per minute for simple flat bags, and slower for gusseted versions, offering versatility for diverse packaging formats.
The operational process of a side sealing bag making machine begins with the film unwinding and passing through tension control. The film is then guided into the sealing station, where heating bars positioned vertically (or horizontally, depending on machine design) apply heat and pressure to the side edges of the film to create the side seals. For flat pillow bags, both side seals are made simultaneously, leaving the top and bottom open. The film then moves to the cutting station, where a knife cuts the sealed tube into individual bags. For side-gusseted bags, additional folding plates create side folds before sealing, resulting in a bag that can expand when filled. Some machines incorporate a bottom-forming station that folds and seals the bottom of the bag to create a square-bottom design, common for coffee and snack packaging. Registration systems ensure that side seals align correctly with printed graphics. The stacking unit collects bags with side seals, which may require special orientation to keep the seals flat.
Plastic Bag Making Machine
Key technical specifications for side sealing bag making machines include bag width (100-800 mm), bag length (150-1500 mm), seal width (2-10 mm per side), film thickness (15-150 microns), and production speed (150-250 BPM for non-gusseted, 80-150 BPM for gusseted). Sealing temperature ranges from 120-220°C, with separate temperature controls for each side seal to accommodate uneven film thickness. The machine's power consumption is typically 15-30 kW, with pneumatic pressure at 6-8 bar. The cutting mechanism can be rotary or guillotine, with the guillotine preferred for heavier films. A critical feature is the side seal width adjustability, as different products require different seal widths for strength. Optional features include a gusset former, bottom sealing station, and an automatic winder for perforated roll bags. The machine footprint is generally longer than bottom-seal machines due to the additional forming section for gussets.
side sealing bag making machines are widely used for packaging bread and baked goods, where the open bottom allows easy insertion of loaves. Produce bags (for fruits and vegetables) often use side seals with perforation for roll dispensing. The side-gusseted configuration is popular for coffee, pet food, and snacks, as the gusset provides a stable base for shelf display. Industrial applications include packaging of hardware parts, powders, and granular materials where a wide mouth is needed for filling. Medical and pharmaceutical bags with side seals are used for sterile wraps and IV solution pouches, as the side seals provide a clean, flat surface for labeling. The ability to incorporate a bottom gusset makes side sealing machines ideal for stand-up pouches, a rapidly growing segment in premium consumer goods.
Selecting a side sealing bag making machine requires determining whether you need gusset functionality. If your bags are flat pillow bags, a simpler machine with only side seals and a cut-off is sufficient. For gusseted bags, ensure the machine has reliable folding plates that can handle the film thickness and maintain consistent gusset depth. Evaluate the side seal pressure and temperature control – each side should have independent adjustment because film edges may vary in thickness. Consider the need for a bottom seal station if you produce bags with a closed bottom (e.g., for filled pouches). Check the changeover time; side sealing machines with quick-change sealing bars and gusset formers reduce downtime. The stacking system must accommodate the seal orientation – some machines use a rotating stacker that flips bags to flatten the seals. Also, assess the machine's ability to handle different film materials – polyethylene, polypropylene, and laminates – as side seals require precise temperature control to avoid burn-through at the film's edge.
Maintenance of a side sealing bag making machine focuses on the sealing bars and the gusset forming section (if present). The side sealing bars must be cleaned daily to remove polymer residue, as residue can cause uneven seal width. Inspect the heating elements and thermocouples monthly, as side seals are more prone to temperature gradients due to the vertical orientation. For gusset formers, clean the folding plates regularly to prevent film sticking and ensure smooth folding. The cutting blade requires periodic sharpening, especially if cutting multiple film layers in gusseted bags. Lubricate all moving guides and rollers weekly. For machines with registration, calibrate the sensor alignment monthly. Since side sealing machines often handle printed films, the registration system's response time is critical – test it with a sample film to ensure accuracy. Keep spare sealing bars and gusset formers for quick changeovers. By maintaining the sealing and forming components in top condition, operators can achieve consistent bag dimensions, strong seals, and high production efficiency, making the side sealing bag making machine a valuable addition to any packaging line.
