Things You Need to Know About a Plastic Injection Mold-Making Company

A quality management system is one of the most important things to look for in a plastic injection molding company. A quality management system consists of a company’s processes to create the goods and services they sell. The goal of producing such goods and services is to ensure they are qualified and reputable in the market. To ensure quality, a plastic injection molding company should have in-house quality assurance personnel that oversee all projects.

Resin selection

Resin selection is a crucial part of the plastic injection mold-making process. The resin used will determine how well the finished product will perform and whether it will be durable. The resin must also provide the necessary strength and grip for the product. It should also meet regulatory and industry specifications.

Resins come in different grades and families. There are amorphous, semicrystalline, and crystalline varieties. Each one has other characteristics and properties. Resins with higher properties will have a higher cost but yield better performance. Producers often add fillers and additives to impart the properties they need. In addition, they can include antimicrobial additives for applications involving food.

Environmental conditions also influence resin selection. In some applications, the resin may have to withstand extreme temperatures. In other cases, it may need to withstand chemicals or bodily fluids. In such cases, the plastic injection mold making company should use a resin that is biocompatible or FDA-approved.

Designing a part for injection molding

Designing a part for injection molding involves creating a design that meets the requirements of the mold. The plan should include the right amount of space and undercuts to ensure a successful outcome. This will make the part more pliable and reduce the risk of it sticking to the surface of the mold. It should also minimize the thickness of the part. Keeping in mind that 50% of the injection molding cycle is dedicated to cooling and solidification, it is essential to reduce the thickness of the design to save money.

The injection molding process allows you to produce complex and complicated parts at an affordable cost. However, the process is smooth, and several vital aspects must be considered. These include the design of the mold, the material, the boss orientation, the text style, and the part’s overall shape. Keeping these guidelines in mind will help you to achieve the best results possible.


Tooling is an essential component of plastic injection molding. A good tool can significantly influence the quality and efficiency of the final plastic components. For optimal results, the tooling should be built to precise tolerances. This will ensure accurate geometry, minimize wastage, and allow easy parts retrieval.

The initial design and fabrication of a tool begin with a prototype. It is a process that can take two to sixteen weeks. The molder and toolmaker work together to create test parts that demonstrate how the tool functions. Usually, this includes a small set of shots in a production resin. These samples can be used for verification testing and form/fit testing.

An injection mold’s tooling consists of two main parts. On one side, the tool has a stationary A-side attached to the side of the molding machine where the molten plastic is injected. The other side, known as the B-side, opens when the part is cooled and is ready to be removed from the tool. Both halves are equipped with cooling lines that direct the flow of cooling media into the device.

Cycle time

Cycle time is one of the most critical components of any injection mold-making process. It can affect the production speed of a mold. A plastic part’s cycle time depends on many factors, including the plastic’s melt temperature and the maximum wall thickness of the part. It also depends on the type of plastic and its shape. If the part holds its shape during the entire cycle, the plastic part is ready to be ejected from the mold.

An accurate cycle time helps molders achieve more capacity at lower costs. Precise cycle time also helps manufacturers better grasp part production timelines, which are crucial for sales forecasting and part availability.

Quality control

Quality control is one of the most important aspects of a plastic injection mold-making company. A company that does not practice quality control will often produce products that are not up to standards. This may be due to the design, color, size, or other aspects. Check these details early to avoid unhappy customers and a bad reputation for the business.

Quality control involves regular inspection of the mold and product. This helps improve the overall production rate. Also, molds should be tested frequently to ensure they continue to meet customers’ specifications. Some manufacturing companies do not provide this service, although some do.

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