Sealing of Cases
Gummed tapes are water-activated. They will adhere satisfactorily to all packages made from paperboard. They will not work well on metals or plastics. If "H" taping is used, and the tapes manufactured from hard-sized kraft paper and efficiently applied, they should provide reasonable moisture and water-resisting properties, adequate for normal transport hazards. Due to environmental pressures, kraft paper gummed tapes have gained in popularity, recently.
Pressure-sensitive tapes are already activated and will adhere satisfactorily to packages or containers made from paper, paperboard, metal, glass or plastics. They are based on Regenerated cellulose film, Cellulose acetate film, Polyvinyl chloride (PVA) film, Fabric and Moisture-resistant paper. Such tapes need only the application of pressure to cause them to adhere to almost any surface. Apart from seeing that the surface is free from dust, oil, grease or moisture, no special preparation before application is necessary.
Heatfix or Thermo-sensitive tapes
Thermo-sensitive tapes are paper or fabric based and heat activated. They will adhere satisfactorily to packages or containers made from paper, paperboard, metal, glass or plastics. Such tapes, once activated by heat, need only the application of pressure to cause them to adhere. They are not used frequently in the corrugated field.
Steel or Plastic strapping can be used for: Bundling, Palletizing, Unitizing, Reinforcing, Closing and Bailing. Polypropylene or Nylon strapping is what is most commonly used for pack sealing. The advantages are a strong and secure seal, however, it lacks ascetic appeal.
King size staples are also used for sealing corrugated cases. These large performed staples are clinched on a retractable anvil, thus enabling the case to be closed after it has been packed. The main advantages are: economy and speed of closure, security and efficiency - no problems with storing pre-sealed cases or drying time. However, they are less suitable for sensitive or food uses.