|
| Toray ¡°Lumirror¡± |
| polyester film, is made from polyethylene terephthalate which has the following molecular structure: |
| This polymer is formed by the polycondensation reaction of terephthalic acid and ethylene glycol. ¡°Lumirror is made by |
| extruding the polymer in a melted state into a sheet form, stetching it in the machine and transverse directions, and then subjecting it to a geat setting treatment. |
| ¡°Lumirror¡± has many applications as exemplified below: |
(1) |
High-voltage electric equipment |
| |
|
Insulators of motors |
| |
|
Insulators of transformers |
| |
|
Insulators of coils |
(2) |
Cables |
| |
|
Wrapping of communication cables and wires |
| |
|
Wrapping of power cables (for shielding and protection) |
(3) |
Printed circuits |
| |
|
Base plates kf flexible, printed circuits, tapes and cables. |
(4) |
Electrical Lamination |
| |
|
Lamination of micad, nonwoven fabrics, glass fabrics, polyethylene, aluminium foils, metallized materials, etc |
| |
|
Adhesive tapes for electrical insulation. |
| OUTSTANDING PROPERTIES OF ¡° Lumirror¡± FILM |
(1) |
Mechanical Properties |
| |
¡°Lumirror¡± has high tensile strength along with proper elongation and good edge-tearing resistance making it suitable for use in electrical insulation. Its mechanical properties as well as other properties are well balaned both in the machine and transverse directions. |
(2) |
Electrical Properties |
| |
In addition to the inherent hight insulation quality of polyester films, ¡°Lumirror¡± has the excellent dielectric strength of 8000 volts for 1 mil film (20 ¡æ¡¢ 68 ¨H¡¢ 60Hz/sec. ¡¢ ASTMD-149-64) £¬ without virtually any insulating defects. |
(3) |
Withstands Heat and Cold |
| |
The melting point of ¡°Lumirror¡± is 262-263 ¡æ (504-506 ¨H ). Its applicable temperature range is from -70 ¡æ to 150 ¡æ (from -95 ¨H to 302 ¨H ), and it can withstand the temperature as high as 180 ¡æ (355 ¨H ) for a relatively short time, It does not contain any plasticizer that very often degrades other films to an oozy state, therefore it maintains its electrical insulating property for long. It will remain flexible under a wide range of climatic conditions. |
(4) |
Dimensional Stability |
| |
¡°Lumirror¡± shows a relatively low thermo-shrinkage rate and good dimensional stability against moisture. |
(5) |
Resistant to Chemicals |
| |
¡°Lumirror¡± will not be affected by any kind of oil and most chemicals and solvents. It can well withstand, therefore, the vamish impregnating and curing process of motors, transformers, etc. However, it is not so resistant ot alkali or hydrolysis at temperature because of polyester film's inherent characteristrics. |
| TYPICAL DATA OF EACH TYPE OF ¡°Lumirror¡± |
| Typical data of each type of ¡°Lumirror¡± are shown in the following table respectively. |
