moulding

Question 1

rotational moulding process

Answer 1

a pre-deterined quantity of thermoplastics granules / powder are put into the mould
mould goes onto an oven and spun on two axes
thermoplastic is forced to the sides of the mould by centrifugal forces
removed from heater ans stil rotating until cool
removed from mould and flash removed

Question 2

rotational moulding materials

Answer 2

HDPE
LDPE

Question 3

rotational moulding producrs

Answer 3

kayaks
plastic safety barriers
cones

Question 4

extrusion process

Answer 4

granules of thermoplastic are fed into the hopper
granules feed along the archimedean screw past the heaters where they soften
softened thermoplastic of forced through a die in a continuous length
product travels through water baths to cool
part is cut to the required length

Question 5

extrusion products

Answer 5

guttering
window frames

Question 6

extrusion materials

Answer 6

PVC

Question 7

extrusion blow moulding process

Answer 7

a parison of thermoplastic is extruded into the mould
mould is closed and air is blown into the parison, blowing it up so that it fills the mould
allowed to cool, mould opened and the flash removed

Question 8

extrusion blow moulding products

Answer 8

gas containers
bottles

Question 9

extrusion blow moulding materials

Answer 9

HDPE