DQL10013 - Extrusion

Front

What are the advantages of the extruder in plastic processing?

Back

The extruder offers a versatile processing technique, operates continuously, and has a relatively low cost of operation.

Front

What is the basic processing concept of extrusion?

Back

Material passes from a hopper into a cylinder where it is melted and moved forward by a screw.

Front

What are the learning objectives of the extrusion unit?

Back

1. Understand process equipment systems operations. 2. Identify operations and controls systems of extrusion machines. 3. Problem-solving techniques for processing errors. 4. Processing parameters of high-performance engineering plastics.

Front

What are the learning outcomes after completing the extrusion unit?

Back

1. Describe extruder components and types. 2. Explain post-equipment of extruder. 3. Describe flow theory. 4. Describe die design principles. 5. Identify extrusion parameters and troubleshooting.

Front

What is the major difference between extrusion and injection molding (IM)?

Back

Extrusion processes plastics at a lower pressure and operates continuously, while IM operates at higher pressures and is not continuous.

Front

What are the two basic types of extruders?

Back

Continuous and batch (discontinuous) extruders.

Front

What is the function of the extruder screw?

Back

The screw causes forward transport, contributes to heating, and homogenizes the material.

Front

What is the function of the die in the extrusion process?

Back

The die accepts the melt from the extruder and delivers it as a shaped product with minimal deviation in dimensions.

Front

Describe the blown film process in extrusion.

Back

Plastics melt is extruded through an annular slit die to form a thin-walled tube, which is then inflated and cooled to create lay-flat film.

Front

What are typical applications of blown film?

Back

Industry packaging, consumer packaging, laminating film, barrier film, medical product packaging, and agricultural film.