Hot runner system is widely used in multiple cavities hot runer especially in multiple cavities hot runner cap mould .because for bottle makers they want the caps have higher appearance ,also,as well as save the material of the plastic.Thus,a good designing of these hot runner system for multiple cap mould seems more and more important for all the cap makers.
 

 

16 cavities cap mould hot runner
Usually,cap mould will choose full hot runner to inject which means the number of nozzles is the same as the cavities number.and of course according to a lot of important aspects such as the mould maker capacity、the injection machine parameter、the requirement of the customers etc.the hot runner system designer will make a decision of how many cavities should choose.besides,the designer will also suggest the best way for all the location of the cavities.
usually the cavities for cap mould hot runner system has 6、8、12、16、24、32、48、64、and some good hot runner system manufacturers will have the ability to produce cap mould hot runner system with 72、96、128cavities.and of course different number cavities cap mould hot runner has different configuration of the injection position.for more cavities cap mould hot runner system the main problem is how to balance the melt flow to each injection points.Basically,a good hot runner system supplier will do M-FLOW for the customer firstly to decide whether the approvaed injection location is the best way to do.
Nozzle for cap mould hot runner system
Mostly,i would say 95% of the cap mould hot runner system use point gate nozzle(see the iamge1) as this kind of nozzle will have very small mark on the prodcuts,but meanwhile the price is very acceptable compare to how much material will waste if choose cold runner and the cycle time.but sometimes,if as the customers' wish and they need really high quality on the surface of the caps,then the valve gate nozzle for cap mould hot runenr system(see the image 2) will be choosen because when using valve gate hot runner .the surface of the cap will be totally smooth but meanwhile of course the price will be much higher than open gate nozzle.

 

Image1:point gate nozzles
 

Image2:valve gate nozzle.
Usually,the manifold will according to the requirement of the mould maker or the plastic prodcts maker .like how many the cavities ,but for hor to locate all the injection nozzles.it is the hot runner supplier's business.