The following are the two most commonly encountered issues in bag-making machine operation.

What to do if the heat-sealing of the bag-making machine is incomplete, causing leakage or spoilage of the contents?

The reason is that the thermal sealing property against contamination of the film is poor, primarily due to the unsuitable resin used in the inner sealing layer.

Countermeasures: Utilize films with good anti-pollution heat-seal properties. Generally, LDPE has moderate anti-pollution heat-seal properties, while EVA exhibits excellent anti-pollution heat-seal properties with a higher VA content. LDPE also boasts good anti-pollution heat-seal properties, and ionic resins and metallocene polymers have superior anti-pollution heat-seal properties.

How to deal with the problem of seal脆 and脆 breakage on bag-making machines?

Reasons: (1) Overheated sealing temperature; (2) Excessive pressure; (3) Extended sealing time; (4) The edge of the top sealer is too sharp or the covering is damaged; (5) The bottom sealing silicone is too hard; (6) During the lamination and curing process, some adhesive渗入 the film interior. The base material's toughness (impact resistance) has decreased due to the adhesive penetration, while brittleness has increased; (7) After cooling and storage, the heat-sealed strength of the plastic composite packaging bag has increased, along with a tendency to become brittle.

Strategies: (1) Select the appropriate sealing temperature, pressure, and time based on the heat-sealing properties of the inner layer material; (2) Improve the surface condition of the upper sealing blade to ensure a flat sealing surface; (3) Ensure complete covering; (4) Choose a silicone pad with the right hardness.