| 配方类型： |
RUBBER, RESINS, PLASTICS, AND WAXES |
| 配方说明： |
Thin Unsupported Film |
| 配方组成： |
Calcium Stearate/0.3
Dibutyl Tin Maleate/1.0
"Marvinol" VR-10/100.0
Carnauba Wax/1.0
"Advance" No.3/0.5
Dioctyl Phthalate/30.0 |
| 配制方法： |
When starting, it has been found advisable to run with a large amount of bleed to prevent initial hang-up in the die. Once the stock is flowing freely throughout the extruder, the bleed can be cut back to a minimum. A small amount of bleed helps prevent stagnation of material in the extruder head. The die temperature for starting should be 20 to 30'F. lower than used for standard operating conditions. Once the tube is formed, operating the extruder near maximum speed seems to prevent stock stagnation.
In beginning work, it is best to use highly stabilized, overlubricated vinyl-compounds until the necessary operating techniques are worked out.
The plasticizer content for very thin film is considerably lower than that used for heavier 4-gage film, which is usually about 45 parts in 100 parts resin. Films containing this quantity of plasticizer tend to be too soft when they are as thin as 2 mils and a lower plasticizer ratio is preferable for many applications. |
|
