Plastic film

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Plastic film is a thin continuous polymer material. Thick plastic materials are often called "sheets". This thin plastic membrane is used to separate the area or volume, to hold the goods, to act as a barrier, or as a printable surface.

Plastic films are used in various applications. These include: packaging, plastic bags, labels, building construction, landscaping, electrical fabrication, photographic film, film stock for film, video tape, etc.

Video Plastic film

Materials

Almost all plastics can be formed into thin films. Some of the main ones are:

• Polyethylene - The most common plastic film is made from one of the polyethylene varieties; Low density polyethylene, medium density polyethylene, high density polyethylene, and linear low-density polyethylene.
• Polypropylene - Polypropylene can be cast film, biaxial oriented film (BOPP), or as a uniaxial oriented film.
• Polyester - BoPET is a biaxially oriented polyester film
• Nylon
• Polyvinyl chloride - film can with or without Plasticizer
• Various bioplastics and biodegradable plastics are available.
• Semiembossed film - Semiemboss film can be used as a delayed rubber liner to retain rubber properties and also to prevent dust and other foreign objects from sticking to rubber during calendar and during storage

Maps Plastic film

Process

Plastic films are typically thermoplastic and formed with melt to form films.

• Cast - Plastic extrusion can get rid of cooled or extinguished film and then rolled.
• The extrusion film can be stretched, thin, or oriented in one direction or two. Blown or tubular processes force air into an extruded ring to expand the film. Flat tenter frames stretch the extruded film before annealing.
• Calendar scrolls can be used to form films of hot polymers
• Deposition of the solution is another film forming process.
• Filtering is used to erode the film from a solid core (sometimes used to make PTFE thread seal tape)
• Co-extrusion involves extrusion of two or more different polymer layers into one film
• Laminates combine two or more films (or other materials) into a sandwich
• The extrusion coating is used to form films onto film or other substrates

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Further process

Plastic films are usually formed into rolls with slitting roll. Often additional coatings or printing operations are also used. The film can be modified by physical vapor deposition to make a metallized film. Films may be subject to Corona treatment or Plasma processing; the film can have the release agent used as needed.

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See also

• Converter (industrial)
• Off cutting (web)
• Movie Base
• Overwrap
• Shrink wrap
• Hot sealer
• Plastic welding
• Plastic wrap
• Stretch wrap
• Plastic Film Journals and Tarpaulins

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References

Standard by ASTM International

D882 - Standard Test Method for Tensile Properties of Thin Plastic Coating

D1004 - Standard Test Method for Hold of Tears (Graves Tear) of Plastic Film and Tarpaulin

D1204 - Standard Test Method for Changing Linear Dimensions from Nonrigid Thermoplastic Layers or Film at High Temperature

D1593 - Standard Specification for Nonrigid Vinyl Chloride Plastic Film and Sheeting

D1709 - Standard Test Method for Impact Resistance of Plastic Film with Free Falling Dart Method

D1894 - Standard Test Method for Static and Kinetic Coefficients of Plastic Film Friction and Tarpaulin

D1922 - Standard Test Method for Resistant Rupture Propagation of Plastic Film and Thin Coating with Pendulum Method

D1938 - Standard Test Method for Tear Propagation Resistance from Plastic Film and Thin Films with Single Tear Method

D2103 - Standard Specification for Polyethylene Film and Sheeting

D2582 - Standard Test Method for Tire Resistance Propagation Stitch from Plastic Film and Thin Sheet

D2673 - Standard Specification for Oriented Polypropylene Films

D2732 - Standard Test Method for Uncontrolled Linear Thermal Shrinkage from Plastic Film and Tarpaulin

D2838 -Standard Test Method for Shrink Tension and Orientation Release Stress Plastic Film and Thin Sheet

D2923 - Standard Test Method for Stiffness of Polyolefin Film and Tarpaulin

D3420 - Standard Test Method for Pendulum Impact Resistance of Plastic Film

D3595 - Standard Specifications for Polychlorotrifluoroethylene (PCTFE) Extruded Plastic Sheet and Film

D3664 - Standard Specification for Biaxial Oriented Polymeric Resin Films for Capacitors in Electrical Equipment

D3985 - Standard Test Method for Oxygen Gas Transmission Rate Through Plastic Film and Tarpaulins Using Coulometric Sensors

D4321 - Standard Test Method for Plastic Film Result Packages

D5047 - Standard Specification for Polyethylene Terephthalate Film and Sheeting

D6287 - Standard Practices for Cutting Film and Specimen Test Sheet

D6988 - Standard Guidelines for Determining the Thickness of Plastic Film Testing Specimens

D8136 - Standard Test Method for Determining Plastic Film Thickness and Thickness Variability Using Measurement of Non-Contact Capacitance Thickness

E1870 - Standard Test Method for Transfer Odors and Flavors of Polymeric Packaging Film

F2029 - Standard Practices for Heatseals for Determining the Heatsealability of a Flexible Web Measured by Seal Strength

F2622 - Standard Test Method for Oxygen Gas Transmission Rate Through Plastic Film and Tarpaulins Using Various Sensors

General books and references

• Hawkins, William E, The Plastic Film and Foil Web Handling Guide CRC Press 2003
• Jenkins, W. A., and Osborn, K. R. Plastic Films: Technology and Packaging Applications, CRC Press 1992
• Yam, K. L., "Encyclopedia of Packaging Technology", John Wiley & amp; Children, 2009, ISBN 978-0-470-08704-6

Source of the article : Wikipedia