| 摘要 |
The strip is heated as it is moved in its lengthwise direction as a film of molten plastic is applied by a wide slot-type nozzle to one side. The film is pressed against the strip by passing between two rollers, the laminator roller pressing against the plastic being held at a temperature below the melting point of the plastic. If desired, the other strip side is similarly coated, and finally the coated strip is heated to near the plastic melting-point and then rapidly cooled to below 40 degrees Celsius. Surface contact is held between the laminator roller or an endless laminator belt (12) and the plastic, and they are moved in synchronism for a time or distance which is sufficient, with the strip speed of 50 m. per minute or more, to cool the plastic at a maximum rate of 400 W/m2 degrees Celsius, down to at least 30 degrees Celsius below the melting point of the plastic before contact is lost. A steel strip can be heated to at least 10 degrees Celsius above the plastic melting point at the point of application. |
