In multicavity injection molding of traditional thermoplastics a perfectly balanced injection system is not always a sufficient condition to ensure a perfect balancing of the weight between the different cavities, this because, of the possible differences in temperature levels. Sometimes even few degrees of difference between the cooling zones can lead to a weight mismatch between the parts.
This is one of the reasons why after the Injection phase is always used a maintaining phase. Keeping under pressure a flowable material inside a series of communicating cavities involves, in fact, a nearly complete balance of their filling.
Unfortunately, in Injection Molding is not always possible to use a maintaining phase after the injection. Some materials, in fact, cannot be compacted due to their characteristics. This is the case, for example, of those polymers filled with blowing agents or, in the field of thermosetting, the case of liquid silicone rubber (LSR).
To allow a correct molding also in all those cases where the balance of the cavities in a multicavity mold is not an easy task, Guzzini Engineering has developed "EasyBalance" Molding System.
EasyBalance molding system is particularly well suited to process liquid silicone rubber (LSR) where the problems of balancing between cavities, precision and repeatability are very important.
EBM LSR is a cold runner system for the injection and distribution of Liquid Silicone Rubber (LSR). It comes from years of experience in the processing of LSR with the aim of solving the problems of:
In detail, the new EBM LSR system allow:
Another peculiarity of EBM system is that it does not require the use of the injection barrel of the press and thus make possible the molding of liquid silicone rubber (LSR) also through the use of a conventional thermoplastics IMM.
It can also be installed along an assembly line where there is the need to add the LSR as a sealant and / or coating of a particular.