4.8 A calender having rolls of diameter 0.3 m produces plastic sheet 1 m wide at the rate of 2000 kg/h. If the roll speed is 5 rev/minute and the nip between the rolls is 4.5 mm, estimate the position

4.8 A calender having rolls of diameter 0.3 m produces plastic sheet 1 m wide at the rate of 2000 kg/h. If the roll speed is 5 rev/minute and the nip between the rolls is 4.5 mm, estimate the position

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

polymer operations

4.8 A calender having rolls of diameter
0.3 m produces plastic sheet 1 m wide
at the rate of 2000 kg/h. If the roll speed
is 5 rev/minute and the nip between the
rolls is 4.5 mm, estimate the position
and magnitude of the maximum
pressure. The density of the material is
1400 kg/m³ and its viscosity is
1.5 x 104 Pa.s.

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Step 1: Write the given data with suitable variables.

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Step 2: Determine the flow rate and platen separation.

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Step 3: Find the location of the maximum upstream of nip.

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Step 4: Find the maximum pressure value.

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