A flexible sleeve in the milking teat cup or rigid-walled liner holder. Responsible for massaging the teat end and intermittantly cutting vacuum at the teat end during milking. Also called inflation.
In packaging, a layer of cork, composition, paper, or some similar material held in a closure to provide a sealing surface against the finish of a container.
A continuous barrier that covers all the earth likely to be in contact with a source so that hazardous substances or leachate containing hazardous substances would not migrate to the surrounding earth. The barrier may be synthetic material (e.g., a thick, continuous polyethylene membrane) or engineered, compacted natural material (e.g., re - worked and low permeability clay). However, an in - situ clay layer that has not been re - engineered by compaction or other methods is not considered a liner.