Injection Molding Service
Custom molded prototypes and low to high-volume production parts made to your specificationsGet a Quote
IATF 16949:2016 | ISO 9001:2015 | ISO 14001:2015 | CT-PAT | Autogestion (Mexico)
When you need plastic injection molding services, our team at International Assembly, LLC is here to help. Injection molding provides a cost-efficient way to quickly and easily produce plastic parts of simple or complex geometries. We can fabricate anything from small, limited lots to large production runs using equipment ranging from 20 to 400 ton presses. Our capabilities include single and two shot molding as well as in-house mold and fixture repair.
Plastic Injection Molding: An Overview
Plastic injection molding produces large volumes of parts for virtually every commercial and industrial application. After the plastic is melted, it gets injected into a closed mold or die where it is cooled rapidly to take the cavity’s shape. Depending on the size, shape, and complexity of the part, the process can take seconds to several minutes.
The process starts when the worker fills the hopper of a molding machine with plastic resin pellets. The pellets are then heated and mixed until they form a liquid resin. The heated liquid resin is injected into the mold cavity under high pressure, causing it to fill the mold cavity. Once the mold is cooled and the resin has solidified, the machine opens the mold and ejects the part.
Injection Molding Advantages
Injection molding has several advantages, including but not limited to:
- Highly cost-effective
- Produces consistent quality
- Allows for low to high volume production
- Accommodates a large variety of materials
- Creates custom finishes
Injection Molding Process Types
Different types of molding processes offer distinct benefits and accommodate various applications.
Conventional Injection Molding
Conventional injection molding is ideal for producing large volumes of parts. It is common in mass-production facilities that make the same part millions of times in quick succession, such as bottle caps.
In-Mold Assembly (IMA)
This type of injection molding allows a metal insert to be implanted into the part in the same operation, increasing strength and enhancing product structure. The method reduces labor, speeds up the manufacturing process, and eliminates the need for separate molds, presses, and other tools like bowl feeders, conveyors, fixtures, and ultrasonic welders. Examples of products created by IMA include rear truck window assemblies and electrical box covers with molded-in screws.
This method is used to manufacture solid parts without hollow cavities. Solid components may include cross-hatched ribs to increase strength and avoid sink. This method is used frequently to produce automotive plugs.
Two-Shot Injection Molding
A two shot molding process, also known as double injection molding, creates complex parts using two different polymers at the same time and in the same machine cycle. During the process, the first polymer is injected into the die, then the machine rotates the mold to allow for the second polymer injection. This method is used to create parts such as automotive firewall shrouds, HVAC doors, and steering column shrouds. Benefits of two-shot injection molding include lower unit costs, improved product quality, reduced handling, and enhanced features.
Quality Plastic Injection Molding Solutions
At International Assembly, LLC, we provide single and two shot molding services, as well as in-house mold and fixture repair. We believe in incorporating lean manufacturing tools and a continuous improvement philosophy in everything we do to ensure that our customers always receive the highest quality products and services. Our presses range from 20 to 400 tons to accommodate virtually any project.
We offer a wide variety of materials for injection molding, including:
- Copolymer polypropylene
- Glass-filled materials
- Automotive engineering grade plastics, including PVC, polyamide, polyurethane, polyethylene, and POM
We primarily serve the automotive industry, providing plastic injection molded parts such as automotive handles, buttons, and trim components. However, we also serve retail consumer, residential, and other markets.
Our additional service offerings include:
- Product and process development
- In-house tool shop for repairs, maintenance, or EC’s
- Decorating services, such as painting, laser etching, or pad print
We are proud to maintain the following certifications to ensure optimal quality and compliance to industry standards:
Get Your Plastic Injection Project Started Today
Plastic injection molding is a cost-effective and efficient way to produce plastic parts. At International Assembly, LLC, we offer a range of plastic injection molding capabilities and services to suit the needs of your project. For more information, or get started on your plastic injection molding solution, contact us or request a quote today.
Plastic Injection Molding - Capabilities
Smaller variety parts (refer to tonnage info below)
|Mold Process Types||
Conventional Injection Molding
The maximum weight of plastic that can be displaced or injected by a single injection stroke. Generally expressed as ounces of polystyrene.
The dimensional allowance which must be made in molds to compensate for shrinkage of the material on cooling or during the debinding operation.
This is variable, contingent upon the Raw Material being used
Number of Cavities
The number of cavities in the mold used to produce multiple products in one molding cycle.
Contingent upon mold design
Our processes produce parts within the acceptable tolerances as specified on Part Drawings by Customers
Prototype / Samples
Quoted on job by job basis