| Fabricante | Tecnova |
| Modelo | Double bubble |
| Año | 2006 |
| Capas | 3 |
| Diámetro del husillo (s) |
1 x 60 1 x 90 |
| L:D ratio husillo(s) |
1 x 30D 1 x 33D |
| Ancho máximo de banda | 1780 mm |
| Rendimiento máximo | 104kg/h |
| Tipo de bobinado | Doble para film plana |
| Incluido construcción de torreta | Sí |
| Características especiales |
Extrusión de doble burbuja. Haga clic aquí para obtener una explicación. |
| Disponible a partir de | Ahora |
| Se puede inspeccionar la máquina en producción | Sí |
Machine used the double bubble extrusion process. In the double bubble process, the polymer is extruded as a tube into a water bath. The water rapidly quenches the polymer, reducing its crystallinity compared to conventional air quench blown film. The lower level of crystallinity helps in the subsequent orientation process.
Following quenching the tube is reheated to the orientation temperature using a hot water bath or IR heater. This two-step process of quenching and reheating the tube helps control the crystallinity as well as produces a more uniform temperature for orientation. The tube is expanded by blowing air inside the tube similar to a conventional blown film process. A difference is that in the double bubble process the tube is oriented at lower temperatures, producing higher stresses during orientation. Stretch ratios are also typically much higher than in conventional blown film. As a result, double bubble films have more orientation than conventional blown films. Melt strength is also not a factor as it is in the blown film process.
