Answer to Question 1
In some operations, chiefly where the melting of the resin is the limiting factor in decreasing the cycle, a second barrel or chamber is added to the injection molding machine. This second chamber is the collection point for the melted resin as it exits from the screw or ram melting unit. The second chamber has a ram injector that can push the melt of resin into the mold even while material is being introduced from the melting unit. The combination of a continuous melting operation and an on-demand injection operation can speed molding significantly in some cases.
Answer to Question 2
Crystallization normally gives materials a sharper melting point. That is favorable in injection molding because it makes the material easier to heat to a uniform viscosity. Furthermore, the crystallinity usually means that the material will cool and solidify more sharply, thus decreasing the time that the material must be cooled. After the part is removed, residual crystallization is common. This continuing crystallization can distort the part. Therefore, cooling fixtures are often needed to ensure that the part will crystallize and complete cooling without part distortion.
A hyfrecator, an electrocautery unit.
What are examples of ideal forms?
This five-wire mass air flow sensor consists of a metal foil sensing unit, an intake air temperature ...
If P(θ) = (√3 /2, -1/ 2), determine the coordinates of P (θ + 90 °) using the unit circle
Explain how it can be desirable from an intertemporal perspective for a country run a current ...
Jason Isbell and the 400 Unit - If We Were Vampires