American Technical Molding

News

Mar 22, 2011

American Tool & Mold helps customers realize their potentials with unique conceptual design efficiency and lean manufacturing.

Mar 8, 2011

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.

 

Hot Runner Molding

American Technical Molding provides plastic injection molding using hot runner molds, a process that offers the lowest cost per part when a large number of plastic parts need to be manufactured quickly.

Primary advantages of hot runner molding include:

  • Materials cost savings - no runner to regrind or reprocess
  • Least expensive cost / piece
  • Reduction of energy costs
  • Shorter, faster cycle times - no runners to cool
  • Smaller machines - reduced shot volume into runners
  • Automated processing – runners do not need de-molding
  • Gates at the best position for economical design
  • Elimination of runners means
    • No runners to remove or regrind
    • Reduces the possibility of contamination
    • Lower injection pressures
    • Lower clamping pressure
    • Consistent heat within the cavity
    • Shorter cooling time
    • Shot size reduced
    • Cleaner molding process
    • Eliminates nozzle freeze

Hot Runner Molding: Precise Computer-Controlled Accuracy and Advanced Processes

Hot runner molds are usually connected to needle valve nozzles, which are activated with precise computer-controlled timing for accurate reproduction of parts.

This allows for a number of advanced processes, including:

  • Multi-Cavity Molds – cavities with different geometries and/or volumes
    • Parts that belong together produced in one mold
    • Injection valve opening and closing can be adjusted to the conditions of each individual cavity
    • Injection pressure and holding pressure may be adjusted  independently of each other
  • Controlled Volume Balancing – a weld line can be shifted into a non-critical area of the molded part
  • Stack Molding – multiple parting lines for additional cavities in a given area

Hot-Runner Systems: Weigh the Cons with the Pros

There are, however, a few disadvantages to hot runner systems that need to be considered:

  • Hot runner molds are more complex and expensive to build than cold runner molds
  • Higher initial start-up costs than cold runner systems
  • Complex initial setup prior to running the mold
  • Higher maintenance costs – more susceptible to:
    • Breakdowns
    • Leakage
    • Heating element failure
    • Wear caused by filled materials
  • Risk of thermal damage to sensitive materials
  • Elaborate temperature control required

1700 Sunshine Drive Clearwater, FL 33765 | Phone: +1 (727) 447-7377 | Fax: +1 (727) 447-0125 | sales@a-t-m.com