Mold Temperature Control

Machine process controls coordinate individual functions of the clamp, injection unit, ejector mechanism, and mold systems and accessories such as core pulls and unscrewing dies for threaded parts. The more advanced controls employ a feedback system (closed loop) to provide much tighter control over actual parameters vs. setpoints. High-level controls are capable of communicating with auxiliary equipment such as chillers, hopper loaders, mold temperature controllers, robots, etc., and displaying all machine parameters and conditions (Chapter 3)... 

Another important factor in mold temperature control is the material the mold is made from. Beryllium copper has a high thermal conductivity, about twice that of steel and four times that of stainless steel. A beryllium copper cavity should thus cool about four times as fast as a stainless steel one. A mold made of beryllium copper would therefore run significantly faster than one of stainless steel. 

Liquid Temperature-Control Equipment (Chillers, Mold-Temperature Controllers, Cooling Towers)... 

The dimensioning of the mold temperature control system requires corresponding knowledge of the heat transfer subject. 

The mold temperature control system must therefore be laid out in a manner which allows the heat of the molded part to dissipate uniformly and within the shortest possible time. Aside from the quality of the molded part, therefore, profitability is also strongly affected, because of the effect on the cycle time. 

The mold temperature control system should be laid out in such a way that a thermoplastic molded part cools as uniformly and as as possible. 

In order to overcome this problem, the use of an indirect, temperature controlled, type cooling system (such as a mold temperature controller) should be considered with the flow rate, and the temperature of coolant, standardized for each machine. Alternatively fit a solenoid actuated valve into the coolant supply this should only permit water flow when the temperature exceeds a preset value. 

Please note that it is the melt temperature which is important those temperatures given in the table are only suggested, initial settings. The temperature of the hydraulic. oil, the hopper block and the material temperature should also not vary excessively. Mold temperature control is extremely important and therefore these temperatures must be checked regularly. 

Injection molds are machined from a variety of tool steels and then hardened or in some cases plated with chromium, nickel, or proprietary materials. Large molds use prehardened tool steels because they cannot be hardened after machining. 124 Stainless steel is employed for some smaller molds, particularly those used for optical and medical parts and for corrosion resistance. Since they provide better heat transfer and, thus, shorter molding cycles, materials such as beryllium copper are used as inserts in critical areas. Injection molds are usually cooled or heated with water, although oil or electric heater cartridges are employed for high-mold temperatures. Mold-temperature controllers pump water into the manifolds and then into cooling fine machine into the molds. 

Injection molding requires an injection molding machine, a mold, and ancillary equipment such as materials feeding and conveying equipment, dryers, mold temperature controllers, chillers, and robotics and conveyors. 

Injection molds are usually cooled or heated with water, although oil or electric heater cartridges are used for high mold temperatures. Mold temperature controllers pump water into the manifolds and then into cooling Unes machined into the mold. 

Mold temperature selection the mold temperature control is very critical for (1) resin curing management, (2) resin gel time control, (3) resin viscosity control, (4) material selection of vacuum bag, sealing tapes, flow distribution medium layer, flow distribution tubes, resin flow inlet and outlet tubes, peel ply, mold release agent and the construction material of the mold itself. 

---