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By Jeremy Losek, Jul 21st, 2022

Plastic Injection Molding Knowledge Base

Our Knowledge Base area provides information on plastic injection mold processes, and various topics related to plastic injection molding.

What is plastic injection molding?

Essentially, it’s the process of heating plastic resin pellets and forcing the melted plastic into a mold cavity. Once the plastic has cooled, the part is released and then the process begins all over again.

Plastic material in the form of small pellets are fed into the injection unit and then heated to a molten stage (transforming from a solid state to a liquid). After reaching the right temperature, the hot molten plastic is forced into the mold. Either a screw or a ram controls the pressure and speed of this phase of the injection molded plastics process. The short phase between the injection and the cooling of the object into its solid form is referred to as the “dwelling” phase. This step ensures that the mold cavities are completely filled before cooling begins. Learn more about the basics of plastic injection molding.

Advanced Injection Molding Processes

Advanced Plastic Injection Molding Processes

With the plastic injection process, the applications are limitless. Simple carrying bags, packaging material, beverage bottles, accessories for the computer, automobile parts and toys can all be manufactured using advanced plastic molding technology. From the simplest of things to the most complicated life-saving devices, plastic injection molding technology is capable of manufacturing high-quality products. Learn more about the advanced plastic injection molding processes.

Injection Molded Plastic Part Design Guidelines

To help avoid costly and time-consuming design mistakes, we created a plastic injection molding design guide. It provides information on the most important design requirements so they can be incorporated at the initial design stage. The sample tips below illustrate the type of information provided in the complete guide. Click here to download the guide.


Calculate Cooling System In Injection Molding

Once the molten plastic is injected into the mold, the cooling process begins. The cooling process can take upwards of 2/3 the cycle time (total time to inject plastic and then eject the part) until the part is solid enough to be ejected from the mold. Cooling is a crucial part of the injection molding cycle because it has a major impact on both the quality of the part and the productivity of the mold. Many defects such as residual stresses, shrinkage and warping are caused by non-uniform cooling. Learn more about the plastic injection cooling process.

Calculate Plastic Mold Shrinkage

Plastic injection molding shrinkage is the contraction of a plastic molded part as it cools. Most of the part shrinkage occurs in the mold while cooling, but a small amount of shrinkage occurs after ejection. After that, the part may continue to shrink very slightly for several hours or even days until the temperature and moisture content stabilize. Learn more about plastic molded part shrinkage.

Clamping Force

There are three main parts in an injection molded plastics machine – the mold, the clamping unit and the injection unit. It is the clamping unit that holds the mold together during the plastic injection and the cooling process. Without the proper clamp force during injection molding there could be disastrous results. Learn more about plastic injection clamp tonnage.

Custom Injection Molding Thermoplastic

Injection mold thermoplastic materials are the plastic that we see in everyday life in phones to kitchen utensils. They make up a large volume of consumer products, industrial, and electronic components. Learn more about thermoplastics.

Gas Assist Injection Molding

Gas assist injection molding is a process that utilizes an inert gas to create one or more hollow channels within the injection-molded plastic parts. At the end of the filling stage, the gas is injected into the still liquid core of the molding. This creates desired hollow areas during the injection molding process. Learn more about gas assist injection molding.

Instant Quote

ICOMold’s proprietary online quote system for custom plastic injection molding and CNC machined parts gives you fast access to your quotation, plus provides the ability to interactively manage your project online once it has begun. See how in six steps you can turn your CAD file into a finished product.

What is Mold Manufacturing?

Plastics are a material commonly used for goods across a variety of industries. Toys, medical devices, tools, and more are all made from plastic. To produce a plastic part, it must be manipulated to the shape desired using a method called plastic injection molding. This highly efficient process can make parts in many sizes and shapes and can replicate the same part multiple times using the same mold. Read more about mold manufacturing.

What are Examples of Injection Molding Products?

Injection molding (moulding) is a popular manufacturing process used to make many of the items we use every day. If an object is made of plastic, there is a good chance it was made using injection molding. Commercial, consumer goods, industrial, and more all use injection molding to produce products. Injection molding offers businesses the opportunity to create a custom design with details that are unique to their brand. Read more about examples of Injection Molding Products.

What is 3D Molding?

3D molding is a method of injection molding that utilizes a plastic mold made by a 3D printer. While a traditional steel or aluminum injection mold is ideal for mass production, a 3D mold may be an alternative for prototypes or projects that require lower volumes. Read on to discover if 3D molding is the best choice for your job. Read more about 3D Molding.

What is a 3D Printed Injection Mold?

A 3D printed injection mold is produced by a 3D printer. While traditional injection molds are made from steel or aluminum, 3D printed molds are made from plastic. 3D printed injection molds are typically used for projects that require a lower volume production run where less than a hundred of a part is needed. They are also useful in circumstances that require multiple molds as they can be made quickly. Read more about 3D Printed Injection Mold.

What is ABS Injection Molding?

If your project requires a rigid product that is lightweight and durable, consider ABS plastic for your job. A few popular items made from ABS include appliances, toys, medical supplies, musical instruments, computer parts, and more. The ICOMold team are experts at ABS injection molding and can provide you with a seamless process from prototype to production. Read more about ABS Injection Molding

What is an Injection Molding Press?

Also known as an injection molding machine, an injection molding press is a machine used in the manufacturing of plastic parts using the injection molding process. Injection molding machines are highly efficient and can produce thousands of parts from the same mold. It is the most common method for producing plastic injection molded products. Read more about Injection Molding Press

What is Ceramic Injection Molding?

Ceramic injection molding (CIM) is a cost-effective way to produce a large volume of small complex parts. This molding process is used by many industries including printing, aerospace, optical, medical, dental, chemical, and more. It is particularly useful when you must produce a part that requires complex machining operations and a large volume of production. Read more about Ceramic Injection Molding

Liquid Silicone Molding 101

Liquid silicone rubber (LSR) products span across a variety of industries. Seals, electric connectors, kitchen items, and baby products, are all made of silicone rubber. The use of silicone has become popular because it can maintain its mechanical properties over a wide range of temperatures, from freezing to extreme heat, and it can repel water. The process of producing a liquid silicone rubber part is similar to that of other thermoplastic parts. Read more about Liquid Silicone Molding 101

Micro Molding 101

Micro molding (or micro moulding) is a unique form of injection molding that requires precision and expertise. A mold with a cavity that dictates the shape of the part is made, moldable material is injected into the cavity, and once the material is set, a part is produced. Micro molding is utilized by multiple industries, from medical devices, telecom fiber optics, automotive, and more. Read more about Micro Molding 101

What is HDPE Molding?

HDPE molding is the injection molding of parts using the material high-density polyethylene (HDPE). HDPE is a commonly used plastic because it is lower in cost and has good chemical and impact resistance. There are many applications for HDPE plastic across a variety of industries, from consumer products to industrial or commercial use. Read more about HDPE Molding

What is Mold Tooling?

To produce a higher quality plastic injection molded part, the right mold tooling must be used. ICOMold only selects premium components and materials for your job and will work closely with you to configure the best custom plastic injection mold tooling for your project. Read more about Mold Tooling

What is Polymer Molding?

Polymer molding is the process of producing a product by injection molding using a polymer material. There are many different kinds of polymer, allowing for a large variety of designs and applications across multiple industries. The process of injection molding is perfect for projects that require a large volume of products with complex features. Read more about Polymer Molding

Precision Injection Molding Basics

Precision injection is a method of injection molding that requires great accuracy. It is not used to produce an entire product, but instead for rare occasions when a project requires a precise form of plastic injection molding. The precise plastic parts produced are often used to replace high-precision metal parts in instruments, electronics, optics, medical devices, and more. It is because of these requirements that precision injection molding requires a precision mold and precision machines. Precision molding is a sophisticated process Read more about Precision Injection Molding Basics

What is Prototype Plastic Molding?

Prototype plastic molding is a vital step in the development of plastic injection molding components because it can help to detect design flaws and other issues during the design stage while saving valuable time and money. Plastic prototype molds can be produced quickly to stay within demanding deadlines. They can have the same functionality, shape, and fit as the final product minus specific details such as color or finish. Read more about Prototype Plastic Molding

What is PVC Injection Molding?

PVC is a widely used industrial thermoplastic used to create a variety of plastic goods including pipes, siding, and more. Its excellent strength and good weatherability make it suitable for many projects. As PVC is in large demand, finding a knowledgeable manufacturer to guide you through PVC injection mold processing is important. Read more about PVC Injection Molding

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