Insufficient mixing time, high or low discharge temperature; Simultaneously adding acidic and alkaline coordination agents (such as adding stearic acid and anti coking agent ESEN together with zinc oxide and magnesium oxide); Insufficient molding; Inappropriate sequence of addition of coordination agents; Adding fillers too late during the mixing cycle; Simultaneously add small particle carbon black and resin or viscous oil; Insufficient dispersion time of metal oxides; Add liquid accelerator after the rubber material has torn or broken; The batch size of rubber material is too large or too small

Not following the established mixing procedure; Aggregates of oily and dry materials adhere to the top bolt and feed hopper edge; Inappropriate rotor speed; The rubber material is unloaded too quickly from the tablet press; There is no correct and practical flipping device on the tablet press

Internal mixer temperature control failure; Insufficient pressure on the top bolt; Wear transition at the welding layer in the mixing room; The roller temperature control of the tablet press has failed; The elevated flipping device on the tablet press is malfunctioning

Rubber expired and partially gelled; EPDM or butyl rubber is too cold; Frozen natural rubber; Insufficient pre molding of natural rubber; Excessive moisture in the filler (clumping); Add a viscous admixture below the pouring point temperature; Inappropriate use of compounding agents

The difference in Mooney viscosity of the elastomer used is too large; Inappropriate selection of plasticizers and rubber; Too many hard particle complexes; Excessive small particle filler; Use resin with a high melting point; Insufficient liquid plasticizer; Excessive fillers and plasticizers