Shark Skin A container's surface irregularity in the form of finely-spaced sharp ridges as a result of the relaxation effect of the melt at the die exit. The dimensional decrease of a bottle after being molded, generally caused by cooling and the ensuing contraction of the plastic material. A printing method that, in its simplist form, involves laying a pattern of an insoluble material as an outline on a finely woven fabric, enabling the ink that is drawn across the screen to pass through the screen. A decorated, plastic sleeve that fits over and then onto plastic bottles. A material that will continually soften when heated and harden when cooled.
Most polymers used for bottles are thermoplastics.
Able to be continually softened by heating and hardened by cooling. The informal, generic term for any of the vinyl resins.