Asked by: Edelweiss Monnig
business and finance food industry

What are the disadvantages of extrusion?

Last Updated: 6th June, 2020

23
Disadvantage – Size Variances
When the hot plastic exits the extruder, it frequently expands. The expansion of the plastic at this stage of the process is called die swell. Predicting the exact degree of expansion remains problematic as it arises from different factors in the process.

Click to see full answer.

Also know, what are the advantages of extrusion process?

The two main advantages of this process over other manufacturing processes are its ability to create very complex cross-sections, and to work materials that are brittle, because the material only encounters compressive and shear stresses. It also forms parts with an excellent surface finish.

Additionally, what is extrusion and its types? Extrusion is a manufacturing process that involves forcing base metal through a pre-shaped die to create objects with a specific shape and profile. There are different types of extrusion processes, however, including cold, hot, friction and micro.

Also Know, what are the advantages and disadvantages of injection Moulding?

Plastic injection moulding advantages centre around great precision and high repeatability, combined with speed, a low cost per part and a huge choice of available plastics. Disadvantages include a higher initial cost and lead time than some other processes.

What is cold extrusion?

Cold extrusion is also defined as a compressive forming process (push-through), where the starting material is billet / slug and the process is carried out at the room temperature. During the cold extrusion process, deformation heating of the deforming material takes place at several hundred degrees.

Related Question Answers

Natia Schuttelhofer

Professional

What does extrusion mean in medical terms?

Medical definitions for extrusion
A thrusting or forcing out of a normal position. The eruption or migration of a tooth beyond its normal occlusal position.

Rona Olondriz

Professional

What are the main extrusion defects?

There are three principal extrusion defects: surface cracking, pipe, and internal cracking.
  • Surface Cracking:
  • If extrusion temperature, friction, or speed is too high, surface temperatures can rise significantly, which may cause surface cracking and tearing.

Trena Groder

Professional

What is impact extrusion process?

Impact extrusion is a manufacturing process similar to extrusion and drawing by which products are made with a metal slug. The slug is pressed at a high velocity with extreme force into a die or mold by a punch.

Huili Santas

Explainer

How do you improve extrusion process?

Tips for Improving Extrusion Efficiency and Preventing Problems
  1. Adjust feed throat temperature.
  2. Maintain a consistent regrind form.
  3. Cool screws when processing polymers to minimize degradation.
  4. When starting an extruder with an empty screw, start turning the screw slowly and then introduce the resin by opening the feed throat slide gate.

Aingeru Windl

Explainer

Why is extrusion Moulding used?

Extrusion moulding. Extrusion is a manufacturing process used to make pipes, hoses, drinking straws, curtain tracks, rods, and fibre. The granules melt into a liquid which is forced through a die, forming a long 'tube like' shape. The shape of the die determines the shape of the tube.

Abdalahi Goxenetxea

Explainer

How does food extrusion work?

It is a process by which a set of mixed ingredients are forced through an opening in a perforated plate or die with a design specific to the food, and are then cut into a specific size by blades. Extrusion enables mass production of food via a continuous, efficient system that ensures uniformity of the final product.

Josu Lois

Pundit

How do you calculate extrusion ratio?

Extrusion Ratio: Area of the billet/area of the shape.
The extrusion ratio is the ratio of the area of the work billets cross section (Ao) to that of the extrusion's cross section (Af). The extrusion ratio, or reduction ratio, can be expressed as (Ao/Af).

Haywood Brauns

Pundit

What is extrusion and its type?

Extrusion is a metal forming process in which metal or work piece is forced to flow through a die to reduce its cross section or convert it into desire shape. This process is extensively used in pipes and steel rods manufacturing. The most common material extruded are plastic and aluminum.

Shuyan Jellinghaus

Pundit

What products are made from injection Moulding?

Injection moulding is used to create many things such as wire spools, packaging, bottle caps, automotive parts and components, toys, pocket combs, some musical instruments (and parts of them), one-piece chairs and small tables, storage containers, mechanical parts (including gears), and most other plastic products

Karamba Orke

Pundit

What materials can be used in injection Moulding?

Below are the most common thermoplastics used in injection molding.
  • Acrylonitrile Butadiene Styrene. Acrylonitrile Butadiene Styrene (ABS), is an opaque thermoplastic and amorphous polymer.
  • Polyethylene.
  • Polycarbonate.
  • Polyamide (Nylon)
  • High Impact Polystyrene.
  • Polypropylene.

Nino Ramallal

Pundit

What is the principle of injection Moulding?

The principle of injection molding is very simple. The plastic material is heated above its melting point, resulting in the conversion of the solid polymer to a molten fluid with a reasonably low viscosity. It is then forced into a closed mold that defines the shape of the article to be produced.

Sarka Borysewic

Teacher

What are the stages of injection Moulding?

These stages are the clamping, injection, cooling and ejection stages.
  • Clamping. Before the mould is injected with material, both halves of the mould have to be closed.
  • Injection. Plastic pellets are fed by means of a hopper into the injection moulding machine.
  • Cooling.
  • Ejection.

Oristila Orga

Teacher

What are the disadvantages of vacuum forming?

Disadvantages of Vacuum Forming
  • Consistent wall thickness is not achievable, very deep parts can be challenging.
  • Intricacy of parts is restricted, additional details can be added with pressure forming.
  • Some clear parts will exhibit mark-off (defects or dirt from mould will transfer to parts)

Belva Luongo

Teacher

What are the disadvantages of injection molding?

Disadvantages of injection moulding. High initial tooling and machinery cost. Part design restrictions. Small runs of parts can be costly.

Lashawn Janse

Teacher

Why do we use injection Moulding?

Using injection molding also ensures the parts manufactured hardly require any work after the production. This is because the parts have more or less a finished appearance after they are ejected from the injection molds. Today, plastic injection molding is an environment-friendly process.

Josephine Lateta

Reviewer

How long does it take to injection Mould?

Typically the cycle time for an injection molded part can be anywhere from a few seconds to a few minutes. Many factors determine this such as the size of the part, the material being molded, the mold design as well as the part design. Set up time for a mold can range anywhere from a few minutes to a few hours.

Nector Sorgel

Reviewer

Why do companies use injection Moulding?

With the injection molding process, molding companies are able to mass produce parts because of the high production output while having a low labor cost that is easy to repeat. Injection molding allows for workload to be cut down because the product is essentially finished once the initial mold is designed.

Clarines Feschenko

Reviewer

What is an example of extrusion?

Everyday examples of extrusion can be seen when toothpaste is squeezed out of a tube, icing is pushed out of an icing bag and "Playdo" shapes are made. Extrusion moulding of plastics is used to make any long shape that has a constant cross section. Perhaps most common plastic extruded is PVC.

Denise Hezekiah

Reviewer

Where is extrusion used?

Extrusion Process. Extrusion process is used for manufacturing long and straight metal parts. The shape of the cross-sections can be solid round, rectangular, to T shapes, L shapes and Tubes etc. Extrusion is done by squeezing the metal in a die by using a mechanical or hydraulic press.