Mold Water System Basics

Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

Molder to moldmaker: “If you want the project, you need to hit the targeted tooling costs.” Then oftentimes the moldmaker builds a tool that fits the budget, but does not have the best performance with regards to water. Here are some basics about the impact of mold's water system.

Loading the player ...


Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

Here are some considerations for designing a mold water system.

Establish a process. The goal is to establish the correct molding process during PPAP. If a process change is required during production, stop. Find the root cause and fix it before changing anything else.

Understand the fundamentals. Engineering a water system capable of moving more energy than the resin can give up during the cooling phase will bring no return on investment. So it is important to first know the resin’s rate of thermal diffusivity. Go further and educate yourself on industry resin standards .

Know your Reynolds number. This calculation reveals the minimum needed to achieve turbulent flow

Perform finite element analysis (FEA). A predictive engineering water FEA is a cost-effective method for collecting data to justify the significant investment of a complex water system.

Check connections, mold materials and process temperature. Water systems often include quick connections that reduce the cross-sectional diameter of the water flow and 90-degree fittings that promote pressure loss (standard fluid dynamics principles). Also consider quick connections on the thermalator or chiller, and all related plumbing. 

By using materials that are highly thermally conductive, it may be impossible to achieve the recommended delta T of 1°F or less. 



  • For Better Mold Venting, Start with the Metal

    Selecting the right material for specific mold components can help prevent a number of costly issues

  • Mold Side-Actions: Applications Rule the Action

    With a firm understanding of the effects of injection on the core, slide and associated components, this second of two articles will discuss emerging modular technologies which provide alternatives to the limited solutions previously available.

  • The Valve Gate Advantage

    Valve gate installations must be made to manufacturer specs to obtain the advantages necessary for competitive production of injection molded parts in today’s marketplace.

Related Topics