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Polyethylene Powder for Rotomoulding: LDPE Pellets Cut to -30 Mesh in an Air-Cooled Mill (Feder, Wedco, US 3,428,260)
Rotational moulding needs polyethylene as a fine, free-flowing powder, but grinding heats the plastic until it softens and clogs the mill. Feder's mill throws the pellets off a fast impeller into toothed cutters, while the impeller itself pumps air through to keep the particles cool.
Result: low density polyethylene powder, -30 mesh, well suited to rotational moulding.
Source: Feder, US 3,428,260 (Wedco, 1969), Operating Example. Picture drawn by Youblob.
Abantado
Factory process
Mga Tagubilin
1
1
Fit cutters for the mesh
Fit cutters for the mesh
Use 12 in cutters with 480 cutting edges for a -30 mesh product (240 edges give -12 mesh). Edges at 60° with a 0.010 in flat; a razor edge would not last. Clearance to the housing 1/4 in.
Mga kailangang kasangkapan:
Gilingan2
2
Run the impeller and cutters
Run the impeller and cutters
Drive the 18.5 in impeller at 2700 rpm and the cutters at 4200 rpm. The impeller pumps air through the housing, which cools the particles while they are cut.
Mga kailangang kasangkapan:
Gilingan3
3
Feed the pellets
Feed the pellets
Feed low density polyethylene pellets about 1/8 in across, in open circuit, at about 150 lb per hour; more overheats the plastic.
Mga materyales para sa hakbang na ito:
Butil na LDPE1 as requiredMga kailangang kasangkapan:
Gilingan4
4
Collect the powder
Collect the powder
Particles small enough pass the screen round the housing; the mill's own air carries them to a cyclone about 10 ft above it. The size spread is narrow, with few fines.
Mga kailangang kasangkapan:
Panghiwalay na siklonMga Materyales
1- 1 as requiredPlaceholder
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