Seal system for melted plastics

A mold for compression molding doses of plastics, comprising:

• a punch including a first male body having a first outer surface and a first female body having a first inner surface coupled with said first outer surface, said first inner and outer surfaces being cylindrical surfaces that are coaxial with one another and being at least partially slidable in relation to one another in an axial direction during compression molding of a dose of plastics;
• a die including a second male body having a second outer surface and a second female body having a second inner surface coupled with said second outer surface, said second inner and outer surfaces being at least partially slidable in relation to one another in said axial direction during compression molding of a dose of plastics;
• a molding cavity defined between said punch and said die when said punch and said die are in a closed configuration for compression molding a dose of plastics, said molding cavity being bounded by said first male body, said first female body, said second male body, and said second female body;
• a first interstice arranged between said first inner and outer surfaces, said molding cavity communicating with said first interstice, wherein plastics that are contained in said molding cavity can leak through said first interstice;
• at least one first seal ring arranged in said first interstice to prevent leakage of said plastics, said first seal ring comprising a first open elastic ring;
• a second interstice arranged between said second inner outer surfaces, said molding cavity communicating with said second interstice, wherein plastics that are contained in said molding cavity can leak through said second interstice;
• and
• at least one second seal ring arranged in said second interstice to prevent leakage of said plastics, said second seal ring comprising a second open elastic ring.