In the bottling industry, cap seal liners are induction or pressure-sensitive liner discs that close and seal containers with an aluminium foil liner and a layer of polymer compatible with the material of the sealed package.
The polymers used most for packaging are:
- Polyethylene (PE), both low- and high-density.
- Polypropylene (PP), partially crystalline.
- Polystyrene (PS), crystal, high impact, expanded or extruded.
The seal liner may be supplied in different sizes, materials or thicknesses, depending on the requirements of the cap and the container:
- Bulk: in boxes, adapted to any closure seal.
- Bagged and faced, to facilitate the bottling company’s automation.
- On rolls: for large quantities, adapted to the needs of the bottling factory.
The liners can also be printed with the wording required by the customer. The most common are:
- ‘Sealed for your protection’.
- Tamper-evident seal.
- Airtight closure.
- Airtight seal.
Used to prevent leaks, ensure the tightness of the content, render the product tamper-proof and increase safety, cap seal liners are highly regarded and used in the following areas:
- The pharmaceutical industry.
- Cleaning companies.
- The entire cosmetics sector.
- Agrochemical treatment companies.
- Food and drink companies.
- The plant protection sector.