INTRODUCTION TO EXTRUSION

What is extrusion?

method of forming substances by forcing them through a perforated plate or die to produce tubes, rods, or other

desired shapes (like squeezing toothpaste out of a tube)

What types of materials can be extruded?

metals (aluminum, copper, steel, etc.)

plastics (polyethylene, polystyrene, nylon)

foods (typically high starch content)

Examples of products formed by extrusion?

[Input of student ideas first]

metals:

automobiles building construction

food or beverage cans appliances

plastics:

pipes milk cartons

packing peanuts toys

foods:

pastas breakfast cereals

multigrain snacks pretzels

jelly beans precooked rice

Saibainuo Machinery    

Extruder Parts & Components:

power supply - operates main screw feeder - regulates rate/pressure of flow barrel - surrounds screw(s)

screw (single or twin) - conveys material die or nozzle - shapes product

special arrangements or attachments - example: knife, co-extrusion unit

Saibainuo Machinery