With all the different liner types available, choosing the correct liner for your product, process and container is an important step. The information below will give a general explanation of the potential options. For further information, feel free to give us a call!
- Comprised of a low density foam core between two solid layers of low density polyethylene, F217 liners provide excellent chemical resistance and greatly reduce the transmission of moisture.
- Found in metal caps, foil liners are laminated with polyester film and bonded to a pulp board backing. Foil liners are resistant to hydrocarbon based products, such as paraffin wax and oil based products. Foil liners are not recommended for use with highly acidic or alkali products.
INDUCTION SEAL LINER
- A specialized liner comprised of several layers including wax, foil and a polymer coating which bonds to the lip of a plastic container through the use of an “Induction Machine”. The type of liner required is determined by the material of the container in question.
- A type of plastic closure which has a sealing ring around the top of the cap where contact with a given container will occur. When a linerless closure is matched to a compatible container, the sealing ring will prevent liquid from leaking. Differs from an “Unlined Closure”.
- A pliable, “PVC” based material found around the inside of both “Continuous Thread (CT)” and “Twist-off (T/O) or Lug” metal closures. When warm plastisol molds to the rim of a matching container, the result is a gasket-like effect. Upon cooling, the plastisol resin solidifies, creating an airtight, vacuum seal. Plastisol lined caps are not recommended for use with home canning processes which subjects the caps to temperatures exceeding 212°F for extended periods as distortion can occur.
- Phenolic cap with a LDPE cone shaped liner which makes contact with the inner diameter of a given container to prevent leakage of liquid products. Recommended for essential oils and other aggressive products.
POLYVINYL (PV) LINER
- Found in metal closures, PV liners feature a polyvinyl film with pulp board backing. Polyvinyl liners are resistant to mild acids, alkalis and solvents. Not recommended for active hydrocarbon or bleach based products.
- A type of liner composed of a pressure sensitive (PS) foam and adhesive. When pressure (such as screwing a cap onto a particular container) is exerted, the adhesive sticks to the rim of the container. When the end user removes the cap for the first time, the PS-22 liner remains, which the customer will remove before use.
PULP / POLY
- Found in metal closures, Pulp/Poly liners feature a pulp board with a polyethylene coating. They have good resistance to acids, alkalis, and alcohols and are commonly used for Vitamins, Minerals, and Medicines. Pulp/Poly liners are not recommended for Chlorinated Hydrocarbons/ Hydrocarbons and Essential Oils.
- A closure that does not have a liner. Differs from a “Linerless Closure”