Application of STM-RHC on Rapid Heat Cycle Molding

For the past few years people have made all kinds of efforts to solve injection molding problems concerning welding mark, ripple, floating fiber and stress concentration. These efforts include many technologies such as optimize mould design (Layout of cavity and waterway), optimize injection craft (Including controlling mould temperature, injection speed, keeping pressure and backup injection), also other auxiliary techniques like hot runner, air supplement and heat treatment. In despite of these attempts, problems still can not be resolved fundamentally. Although spray painting is an effective method, costs would be raised and rejection rate becomes higher. What is worse is that production would harm environment due to benzene. As the novel technology, RHCM system begins to upsurge to solve problems above.

Rapid heating / cooling controllers are also called RHCM heaters, which adopts high temperature steam and make balanced warming track on moulds. Dies close in IMM and high temperature steam is blown into machine, firstly mould temperature is raised up to set value (130℃~140℃), and then it begins to inject plastics into cavity. After IMM pressurizes and turns into cooling mode, cooling water is injected into machine. With that, mould temperature drops quickly to the level of set value, and then air is blown into mould to blow away cooling water. Until now, the whole injection molding is finished.

Advantages of STM-RHC

Eliminate welding line and mark, ripple and silver mark

Exterminate thoroughly shrinkage on the surface of plastics

Enhance smooth finish quality to reach the level of mirror surface

No need to spray painting process to rate of acceptability about 20%~30%

Solve the problem of floating fiber to perfect products

Improve injection molding mobility for thin-walled products to enhance strength

Reduce the production cycle of thick-walled products about 50% to strengthen mobility

Introduction to Shini STM-RHC Heaters

STM-RHC 

Newly developed Shini STM-RHC system has three models, suitable for IMM 300 tons below, 300~600 tons and 600 tons above respectively. The distinctive feature is that STM-RHC is not equipped with boiler equipment for both high temp. hot water and cooling systems are included, and then there are hot and cool water recycling systems. It adopts 7 inch LCD display screen and touch interface of China / English input; the closed loop is adopted to control the detecting of input / output temperature and feedback to PLC with actual mould temperature; high temp. hot water can achieve 90% heat recycle and 100% medium recycle for cooling circulating water, which makes the effect of energy saving obvious.

Plastics application is becoming universal and peoples awareness of pro-environment is under increasing. These factors from society development are likely to render RHCM technology a spotlight capturer.