How to Select Sealing Wire for Packaging Machines

Both packaging machines and sealing machines utilize low-resistance heating bars to seal plastic packaging. However, choosing a long-lasting heating bar can be a challenge for maintenance personnel. This selection is also crucial for the presentation of packaged products and the effectiveness of the seals.

When selecting heating bars, three main factors must be considered: the material and thickness of the packaging, the presence of liquids or oils that may contaminate the seal edge, and the width of the seal.

The material and thickness of the packaging are critical in determining the choice of sealing bars. Packaging materials come in various forms, including single-layer and multi-layer composite materials. Generally speaking, thicker plastic films require thicker bars. Additionally, for composite plastic films, thicker bars are also necessary. This is because, in addition to melting and bonding the material at the seal, the sealing wire must quickly stop heating during the sealing cycle to allow for rapid cooling of the seal area, thereby completing the sealing process effectively.

The material of the heating bars is primarily nickel-chromium aluminum alloy. H-Plus offers imported heating bars from Germany, which feature low resistance and a long lifespan.

Heating wires come in various shapes, depending on their application, including round, T-shaped, flat, bulbous, bead-shaped, and M-shaped.

During installation, some sealing bars utilize compression fittings, while others are welded at both ends to copper bars. To reduce the resistance at the weld points, polishing treatment is required after welding.

To prevent overheating of the heating bars and excessive sealing time that can cause the plastic film to become sticky, resulting in 'oversealing', it is essential to set appropriate sealing times and use high-temperature resistant fabric coated with Teflon.

For more details, please consult H-Plus.