American Technical Molding
American Tool & Mold helps customers realize their potentials with unique conceptual design efficiency and lean manufacturing.
Emilia earned a Mechanical Engineering degree graduating with National Deans List Honors from USF in 2001.
With many years of experience in various roles at ATM and the mentoring of the company's founder, Emilia is taking ATM to the next level of Operational Excellence.
Cold Runner Molding
American Technical Molding provides plastic injection molding using cold runner molds, an economical process to produce plastic parts of simple design, or when more than one color part is needed to be manufactured quickly.
Cold Runner Molding: Efficient and Economical
Significant advantages to using a cold runner system include:
- Simple mold design
- Considerably less expensive than hot runner system
- Less skill required to set up and operate
- Mold requires less maintenance
- Color changes are easy - all plastic in the mold is ejected with each cycle
With a cold runner mold, the runner (excess material retained in the feed channels) is cooled and ejected with the part. Every cycle, a part and a runner are produced.
Cold Runner Molding: A Few Disadvantages to Consider
While it is a less expensive process than hot runner systems, there are a few disadvantages to cold runner systems to consider, including:
- Waste plastic generated
- Runner material must be either disposed of or reground and reprocessed
- Additional steps in the manufacturing process
- Regrind will increase variations in the injection molding process
- Regrinding could decrease the plastic's strength and mechanical properties
Cold Runner Molding: Get the Right Mold for Your Project
Cold runner molds are the least expensive to build for parts of simple design. Depending on part complexity, one of two types of cold runner molds may be used:
- A two plate cold runner
mold is the easiest and least expensive type of mold to
- Two plate molds have a single parting plane, and the mold splits into two halves at the plane
- Because the runner system must be in line with the parting plane, the part can only be gated on its perimeter
- A three plate cold runner mold differs from a two plate
in that it has two parting planes, and the mold
splits into three sections each time a part is
- This feature provides greater flexibility of design, which allows gating to be placed in the most efficient locations
- Since the mold has two parting planes, the runner system can be located on one, and the part on the other, which allows for easier plate separation