Effect of Preheating
Time and Oven Temperature on Stretched PP/WF Composites
Although the specimens initially were submitted to a nontraditional condition such as preheating
, the main results, showed in Figure 4 and Table 1, demonstrate a small change in transformation temperatures.
However, no published studies have been reported in the area of MDF fiber mat preheating
using microwave technology.
In summary, good, consistent barrel filling and top-side fillet form when selective soldering thick, heavy boards is aided by top-side preheating
in combination with drop jet fluxing.
They also offer ancillary preheat products to make preheating
easier, more efficient and owner friendly.
In single-screw extruders, preheating
has been mentioned to solve melting problems; however, it is less common since there is the risk that the preheated pellets (including masterbatch pellets, often based on low-melting carriers) distort the solids conveying and pressure generation process based on Coulombic friction force [8, 9].
A note on automating the preheating
process: Traditionally, the companies most involved in dielectric preheating
have used people to place the material in the oven, start the oven, and move the heated material from the oven to the press.
For this reason, we often find selective soldering machines equipped with a preheating
module that applies heat to the top side of the PCB during soldering.
There was no denying it; preheating
from the topside made a huge impact on hole fill.
Electric infrared ovens used for preheating
material prior to forming.
filters also has become a well-known practice for trying to control thermal shock.
Capable of pressures up to 10,000 psi, the Force 10 requires no preheating