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Hot runner mould

Date:2011-12-14

Hot runner mould

Throught this text,we have occasionlly referred to the molding of thermosects.Before the incredible rise in the use of thermoplastics,thermosets occupied a large portion of the plastics industry.Many Improvements to be thermoset molding technology were made with regard to automation of the process and improvements of the raw materials to allow faster molding and reduce labor cost.
Only after the development of hot runners for thermoplastics did that section of the industry which was still involved with thermoset molding try to develop an equivalent method for thermosets.However,the range of products that would lend themselves economically to "runnerless"molding(as hot runner molding is somtimes called)is very limitied and mainly includes only small products made from phenolics.alkyds,and some rubbers.As a result,the development of hot runner molds is lagging behind,and there is little published in this field.

 
We will,therefore,not go into design details but rather list the important consideration for designing hot runner molds:
1.Themperature control from extruder to gate must be very accurate to prevent scorching of the material.
2.Accessibility to the hot runner system to remove hot runners and the end of a production run(or in case of interruptions)must be easy.
3.Thermal insulation is necessary from the relatively cold machine platen and from the heated mold.The mold is heated to a much higher temperature to achieve fast curing in the cavity;this could influence the runner system.
4.Nozzle area is of particular importance because of the unavoidable contact of two elements with differment temperatures.The nozzle forms part of the hot runner system;the gate is part of the mold.
5.Plastic Flow:Because of the higher viscosity of thermosets,the passages must be larger than those used for thermocouplastics.

 Contact person:Tina

service1003@anole-hot-runner.com

Kewords:Hot runner mould   

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