Discuss the temperature profile shapes normally used for nylon and polyethylene when using a general-purpose screw. Which is higher in actual value? What are the slopes of each?
What will be an ideal response?
The nylon temperature profile is higher because nylon melts at a much higher temperature than polyethylene. However, when nylon reaches its melting temperature, it melts over a narrower range. With a general purpose screw, normally the feed section would be shorter than with the ideal nylon-type screw. Therefore, the nylon temperature in the feed zone would be higher to compensate for the reduction in the adiabatic heating and the time in the feed zone. The compression zone in the general purpose screw is longer than in the nylon-type screw and therefore the heat can be reduced in the compression zone. The net result is a declining heat profile for nylon when a general purpose screw is used. The opposite is true for polyethylene. When using a general purpose screw, the heat profile for polyethylene increases.
You might also like to view...
Todas las opciones siguientes son verdaderas acerca del uso de tensores, excepto _____.
a. los tensores se utilizan para ajustar la longitud de las conexiones del sis- tema de elevación b. la carga de trabajo segura de un tensor gancho- gancho es mayor que la de un tensor ojo-ojo de tamaño semejante c. los tensores deben ajus- tarse con una llave del tamaño apropiado d. cuando se utilizan eslin- gas de varios ramales, solamente se debe utilizar un tensor por ramal
Current breed standards of the Boer goat are black in color with a white head
Indicate whether the statement is true or false.
When working in a trench, what is your number one priority?
What will be an ideal response?
A refrigerant blend with a glide of 2°F or less would be considered:
A) A compound. B) A low glide blend. C) An azeotrope. D) A high glide blend.