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3 years ago

What is the recommended processing technique for manufacturing plastic bottles?

Engineering

1 answer:

charle [14.2K]3 years ago

6 0

Answer Explanation:

THERE ARE DIFFERENT PROCESS TECHNIQUES FOR MANUFACTURING PLASTIC BOTTLES:

EXTRUSION BLOW MOLDING PROCESS: In this process a mold cavity composed of two halves, closes around the parison and pinches off one end. compressed air expands the parison to conform against the cold mold cavity walls
INJECTION BLOW MOLDING: The process of injection blow modeling is used for the production of hollow plastic bottles
STRECH BLOW MOLDING: Stretch blow molding uses either the injection or extrusion blow molding process as a basic foundation

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3 years ago

Water enters the pump of a steam power plant as saturated liquid at 20 kPa at a rate of 45 kg/s and exits at 6 MPa. Neglecting t

Natasha2012 [34]

Answer:

$\dot W_{in} = 273.69\,kW$

Explanation:

The pump is modelled after the First Law of Thermodynamics. A reversible process means that fluid does not report any positive change in entropy:

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The properties of the fluid at entrance and exit are, respectively:

Inlet (Saturated Liquid)

$P = 20\,kPa$

$T = 60.06\,^{\textdegree}C$

$h = 251.42\,\frac{kJ}{kg}$

$s = 0.8320\,\frac{kJ}{kg\cdot K}$

Outlet (Subcooled Liquid)

$P = 6000\,kPa$

$T = 60.06\,^{\textdegree}C$

$h = 257.502\,\frac{kJ}{kg}$

$s = 0.8320\,\frac{kJ}{kg\cdot K}$

The power input to the pump is computed hereafter:

$\dot W_{in} = \left(45\,\frac{kg}{s} \right)\cdot \left(257.502\,\frac{kJ}{kg} -251.42\,\frac{kJ}{kg} \right)$

$\dot W_{in} = 273.69\,kW$

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