4.12A blow moulding die which has an outside diameter of 40 mm and a die gap of 2 mm is used to produce a plastic bottle with a diameter of 70 mm. If the swelling ratio of the melt in the thickness direction is 1.8 estimate 2/² (a) the parison dimensions (b) the thickness of the bottle (c) a suitable inflation pressure if melt fracture occurs at a stress of 10 MPa.

4.12A blow moulding die which has an outside diameter of 40 mm and a die gap of 2 mm is used to produce a plastic bottle with a diameter of 70 mm. If the swelling ratio of the melt in the thickness direction is 1.8 estimate 2/² (a) the parison dimensions (b) the thickness of the bottle (c) a suitable inflation pressure if melt fracture occurs at a stress of 10 MPa.

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

4.12A blow moulding die which has an
outside diameter of 40 mm and a die
gap of 2 mm is used to produce a
plastic bottle with a diameter of 70 mm.
If the swelling ratio of the melt in the
thickness direction is 1.8 estimate
al
(a) the parison dimensions.
(b) the thickness of the bottle
(c) a suitable inflation pressure if melt
fracture occurs at a stress of
10 MPa.

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