injection molding

injection molding
injection molding Manufacturers' Representatives for:

injection moldingH & S Specialties Inc.
 120 14th Ave NE
Glenwood, MN 56334

Sub Miniature Parts are our Specialty.
Rep Phone 763-792-2184      Toll free 877-562-5070 

 Fax 763-785-9065      Toll Free Fax 877-280-2087
For answers to any of your Injection Molding questions, Email Jaworski & Associates

For further details about our injection molding services, please click here.


Injection Molding - competitive pricing
- excellent quality - outstanding customer service.

HIGHLIGHTS AND CAPABILITIES


To see Injection Molding example parts click here.
Using the companies represented by Jaworski & Associates, assures you of consistent
customer service, of the commitment that you deserve, engineering assistance when required
and that you are doing business with companies who have been in business for an extended period of time.


Please use the injection molding quote request form below to request a quote and attach files.

Injection molding quote request form.

Injection Molding History and Information:

In 1868 John Hyatt made billiard balls, by injecting hot celluloid into a mold. The first injection molding machine was made in 1872 by John and his brother Isiah, using a plunger. The machines that are in use today, first made in 1946 by James Hendry, use screws to heat, mix and inject the plastic into the mold.

M.U.D. style molds are sometimes used to help reduce costs of a mold. The outside of the mold is designed to hold several interchangeable inserts, there by being able to make several different parts.

Molds can be designed with more than one cavity for the same part allowing for faster production. A family mold is designed to mold parts of the same family or set at the same time.

Overmolding is a molding process that lets previously molded parts be reinserted in a mold, with a new plastic layer formed around it. Two-shot or multi-shop molds are used to overmold a part within one molding cycle. This requires a special injection molding machine with two or more injection units.

Injection molding presses range from 5 tons to 6000 tons of holding pressure. The molds are held by the injection molding machines or presses, to keep the molds from opening during production. As the plastic sets or hardens in the mold, it takes on the shape of the mold. A substance called a release agent is normally used to make it easier to removed the plastic from the mold.

The materials used for producing the mold, will determine the life of the mold. Those that are made out of hardened steel that is heat treated after being machined, are the longest lasting. Aluminum molds are less costly to make but cannot withstand the production of millions of parts like the steel molds can. Beryllium copper is used in the parts of the mold that need fast heat removal or needs the most heat generated. Molds are typically made by CNC or EDM machines.

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120 14th Ave NE
Glenwood MN 56334