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The bright, star-shaped hole at the center of the image is an air-gap between the beads where the bead margins have not completely fused. Each bead is made of thin-walled, air-filled bubbles of polystyrene. Expanded polystyrene (EPS) is a rigid and tough, closed-cell foam with a normal density range of 11 to 32 kg/m 3. [47]
Plastic film is a thin continuous polymeric material. Thicker plastic material is often called a "sheet". These thin plastic membranes are used to separate areas or volumes, to hold items, to act as barriers, or as printable surfaces. Plastic films are used in a wide variety of applications.
Sheets are cut using saws and rotary cutting equipment. Plasticized PVC is also used to produce thin, colored, or clear, adhesive -backed films referred to simply as "vinyl". These films are typically cut on a computer -controlled plotter (see vinyl cutter ) or printed in a wide-format printer .
Thin-gauge roll-fed or inline extruded thermoforming applications are dominated by rigid or semi-rigid disposable packaging. Sheet thicknesses greater than 3 mm (0.120 inches) are usually delivered to the forming machine by hand or an auto-feed method already cut to final dimensions.
Cellophane is a thin, transparent sheet made of regenerated cellulose. Its low permeability to air , oils , greases , bacteria , and liquid water makes it useful for food packaging . Cellophane is highly permeable to water vapour , but may be coated with nitrocellulose lacquer to prevent this.
Film blowing - Plastic films (carrier bags, sheeting) Blow molding - Small thin-walled hollow objects in large quantities (drinks bottles, toys) Rotational molding - Large thick-walled hollow objects ; Injection molding - Solid objects (phone cases, keyboards) Spinning - Produces fibers (nylon, spandex etc.)
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