Working Process; Introduction Of Equipment Components; Feeding Bin - Famsun Muyang SJPS215 Operation Manual

Single-screw extruder

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2.2.2 Working process

First of all, the materials prepared, blended and pulverized enter the feeding bin with bridge-breaking

device for further process. Then the materials in bridge-breaking feeding bin are delivered by the feeder to

the double-shaft differential-speed conditioner (DDC) for conditioning where mixed with injected steady,

continuous and metered steam, water, and other liquids.

The materials being conditioned for a certain period of time enter feeding section of the extruder

assembly for being conveyed from the feeding section, mainly used to convey and primarily compress the

materials, to kneading section; in the kneading section, materials will be gradually cured or dissolved

through strong stirring, mixing and shearing; meanwhile pressure and temperature will further rise at the

final curing section. As a result, the materials will be cured more; starch will be gelatinized further; fat and

protein will be denaturalized; and thereafter all get homogenized to form a non-crystal texture. Finally,

such materials will be extruded out and cut into shapes through the discharging assembly.

The feeding bin mainly consists of bin body, agitator, gasket, gear reducer and motor. See Fig.2-2.

1.Bin body

2.Agitator 3.Sealing ring 4.Speed reducer 5.Motor

When the extruder is running, it is very important to ensure continuous and steady feeding of

materials. If the feeding is inconsistent, the extruder will run unsteadily, and consequently the quality of

expanded products will not be uniform. If feeding is cut off, it may cause blockage of the machine and thus

downtime. Because the raw materials of products for extrusion (especially the products with small size)

have small granularity and bad flowability, the bridging can be easily formed in the bin, causing

inconsistent and intermittent feeding. This bridge-breaking feeding bin is designed specifically for

resolution of such problem. For its main structure, see Fig.2-2.

Feeding

Discharging

Fig.2-2 Feeding bin

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