What Is A Plastic Injection Mold?

What is plastic injection molding used for?

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

What are plastic injection molds made of?

Plastic Injection Mold Making. Plastic injection molds are typically constructed from hardened or pre-hardened steel, aluminum, and/or beryllium-copper alloy. Steel molds cost more, but are often preferred because of their high durability.

How do you make a plastic injection mold?

Home Plastic Injection Molding With an Epoxy Mold.

  • Step 1: Frame for Holding the Epoxy.
  • Step 2: Mount the Original Model Into the First Half of the Mold Frame.
  • Step 3: Mix & Pour the Epoxy for the First Half of the Mold.
  • Step 4: Let the First Half of the Epoxy Mold Harden.
  • Step 5: Now I Have the Second Half of the Epoxy Mold.

How do plastic molding injections work?

How Does Injection Moulding Work? The plastic is then injection through a nozzle into a mould cavity where it cools and hardens to the configuration of the cavity. The mould tool is mounted on a moveable platen – when the part has solidified, the platen opens and the part is ejected out using ejector pins.

What are the types of Moulding?

Types of Molding Processes

  1. Casting. Casting is a basic molding process as it requires the least amount of complex technology.
  2. Injection Molding. Injection molding is used for creating high-quality three-dimensional objects, that can be commercially reproduced.
  3. Blow Molding.
  4. Compression Molding.
  5. Rotational Molding.

How are molds made?

Molding or moulding (see spelling differences) is the process of manufacturing by shaping liquid or pliable raw material using a rigid frame called a mold or matrix. The liquid hardens or sets inside the mold, adopting its shape. A mold is the counterpart to a cast.

How long do injection molds last?

Generally, a plastic injection mold could complete anywhere between a 100,00 to 1 million (or sometimes somewhat more than a million) cycles in its lifetime, so it’s important to learn about the life expectancy of a mold before buying it.

How much does it cost to make a plastic injection mold?

A plastic injection mold costs between $1,000 and $80,000. The mold’s size, complexity, material, and type affect its price. However, a typical mold costs $12,000.

Why are molds so expensive?

An injection mold is easily the most expensive part of the project, and can dramatically increase costs for small part runs. The main factors that influence the cost of an injection mold are the size and intricacy of the part, the material used, and the number of parts being produced.

How can you melt plastic?

One easy way to melt plastic is using an oven. Just place the plastic in a heat-proof container and melt it in the oven at 300 degrees Fahrenheit. Open some nearby windows and turn on your oven’s fan while the plastic melts to get rid of any toxic fumes. You can also melt plastic using a heat gun.

Can you mold plastic at home?

While molding plastic parts at home, you should give a paint coat to the master part in case it has porous surface or else your mold surface won’t be smooth. Also, use gloves and safety glasses while working at making plastic parts at home.

How do you make silicone molds?


  • Fill a bowl with water.
  • Stir some liquid soap into the water.
  • Squeeze some construction silicone into the water.
  • Knead the silicone while it is submerged.
  • Form the putty into a thick disk.
  • Press your desired item into the silicone.
  • Let the silicone harden.
  • Pull the item out of the mold.