Magnetic tapes video

Materials and products used in the storage of information paper, books, leather, parchment, photographic materials, microfilm, motion picture film, magnetic tape, video tape, and sound discs (phonograph records). 

In conventional tenter orientation, the sequence of steps is as described above (MD—TD). In some cases it is advantageous to reverse the draw order (TD—MD) or to use multiple draw steps, eg, MD—TD—MD. These other techniques are used to produce "tensilized" films, where the MD tensile properties are enhanced by further stretching. The films are generally unbalanced in properties and in extreme cases may be fibrillated to give fiber-like elements for special textile appHcations. Tensilized poly(ethylene terephthalate) is a common substrate for audio and video magnetic tape and thermal transfer tape. 

The exceUent adhesion to primed films of polyester combined with good dielectric properties and good surface properties makes the vinyhdene chloride copolymers very suitable as binders for iron oxide pigmented coatings for magnetic tapes (168—170). They perform very weU in audio, video, and computer tapes. 

A fundus camera was modified to provide video angiograms and to deliver one laser beam used to release the content of the liposomes and another laser beam to activate the photosensitizer. The first laser was also used to illuminate the fundus. The output of the charge-coupled device (CCD) camera was fed into a video image enhancer and recorded on magnetic tapes with a high-frequency video recorder. Later, the tape was played back, and video sequences were digitized with a frame grabber for subsequent analysis. 

In computer hard disks, audio cassette tapes, video cassette tapes, and computer floppy disks for magnetic... 

Biaxially oriented films of PET polyesters are frequently used in the field of magnetic recording media, such as audio tapes, video tapes, computer tapes, and floppy disks. With the tendency to reduce the size and weight of electric and electronic equipment and to improve their performance, the demands become increasingly exacting. 

Storage on modern systems, if drives for removable disks, writable CDs (compact disks), CD-ROMs (compact disk, read-only memory), DVDs (digital video disk), and magnetic tapes are allowed or there are network connections to servers with large-capacity storage devices where data can be stored, is virtually infinite. 

Polyesters enter our lives in a most ubiquitous manner as textiles, carpets, tire cords, medical accessories, seat belts, automotive and electronic items, photographic film, magnetic tape for audio and video recording, packaging materials, bottles, and so on. Their utility is illustrated by the vast range of their applications. This article describes the properties, synthesis, manufacture, and raw materials for the two most widely used thermoplastic polyesters polyCethylene terephtha-late) (PET) [25038-59-9] and poly(butylene terephthalate) (PBT) [26062-94-2]. In order of volume, PET comes first by virtue of its enormous market tonnage in polyester fibers and films, as well as the resin for blow-molded bottles, containers, and food packaging. 

---