Injection Molding

Injection molding is a manufacturing process for making plastic parts. A molten plastic polymer (either thermoplastic, thermoset, or elastomer) are heated and injected into a mold. The molten plastic is heated, forced into a barrel, mixed, and then injected into a mold cavity where it cools and hardens. Injection molding processes are used to make a wide variety of parts and components, including car panels, bottle caps, toys, lawn chairs and much more.

What Is A Mold

The mold itself is an inverse of the desired final product. The mold is made of metal, usually aluminum or steel, and is made to a fine precision to match the component. Injection molding is the most common method of production.

Is Injection Molding Right For My Part Requirements?

Injection molding insures consistency. Parts can be molded from a wide variety of materials onto complex shapes with tight tolerances at high rates of production. Part usage typically determines resin choices. Part geometry affects the cost of tooling. The number of parts needed over the life of the project impacts molding and tooling cost.

What Size Parts Can You Make?

We operate 8 presses ranging from 101 tons of clamping force to 787 tons. Shot sizes range from 4.9 ounce to 155.6 ounce.

What Kind Of Resins Do You Mold?

Typical Hedstrom Injection materials include:

  • Polyethylene
  • Mixed Plypropylne
  • Polypropylene
  • Poly Carbonite
  • Rubbers
  • And many more…

What Is The Price Difference Between Domestic & Offshore Tooling?

Hedstrom Injection offers both domestic and off-shore tooling options. Costs vary but off-shore tooling can often shave upwards of 50% off the cost of a mold. Domestic tooling typically offers much shorter lead times.

How Much Does A Mold Cost?

Molds can vary from several thousand dollars to hundreds of thousands of dollars. Part complexity and number of cavities are the biggest cost factors. The number of cooling lines or special metal components may increase tool cost but help speed part production and minimize heat distortion.

How Do You Protect My Mold?

Each tool is put on a preventative maintenance program. Detailed records of shots, preventative maintenance, and mold modifications are kept on each tool in our possession. Experienced mold makers are available 7 days a week for tool care and maintenance.

Can My Mold Be Modified If I Change My Part Designs?

Yes, molds can be modified within reason.  Mold maintenance and minor modifications, within limitations of the original tool design is an option. We work with a network of high-quality tool shops on major mold modifications.

Can You Assemble My Parts Or Provide Custom Decorating & Packaging?

Hedstrom Injection offers a broad selection of customized in-plant assembly, finishing, packaging, and fullfillment services.

Who Owns The Injection Tool?

The customer pays for the tool and owns it. The mold is designed specifically for your parts. The customer is free to take that mold anywhere once contractual obligations are fulfilled.

What Information Do You Need To Quote My Project?

Part prints or CAD files are the first step. Part samples or prototypes (if available) are always helpful. Specifics include resin, annual part quantity, budgetary estimates for tooling and parts, along with any requirements for prototypes.