1.Insufficient foam holes
The reason:
(1) Quality problems of foaming agent;
(2) The plastic material is too low;
(3) Mixing temperature is too high, foaming agent early decomposition;
(4) The parking time of the rubber material is too long or the parking temperature is too high, and some foaming agents volatilize or decompose;
(5) Vulcanization speed of rubber material is too fast;
(6) The pressure is too high, exceeding the internal pressure formed by the gas generated by the foaming agent, resulting in insufficient foam holes.
Countermeasure:
(1) Check whether the blowing agent is qualified within a limited period;
(2) Check whether the plasticity of the rubber material meets the standard, and if the plasticity is too low, mixing should be added to increase the plasticity to facilitate the hair hole;
(3) Check whether the discharge temperature of the mixer is too high, whether the roll temperature is too high, and whether the rubber is burnt. Some rubber material due to high mixing temperature can be mixed with a small amount of treatment or add blowing agent heavy industry;
(4) The parking time is too long and the rubber material should be returned for supplementary processing;
(5) Formula adjustment, check whether the critical temperature of the curing agent is close to the decomposition temperature of the blowing agent, and coordinate with each other, so that the curing speed and foaming speed are matched;
(6) Adjust the pressure of the machine.
2.Insufficient filling mold
The reason:
(1) Insufficient amount of glue;
(2) The mold finish is not enough or the mold is not clean for too long, and the rubber flow is resisted;
(3) The structure of the mold cavity is complex and the fluidity of the rubber material is not compatible, and the top of the mold can not be filled after the hair hole, forming a defect;
(4) The air in the dead corner of the mold cavity can not be discharged, so that the rubber material is not filled with the mold cavity, resulting in a lack of rubber at the edge.
Countermeasures:
(1) weigh one by one to ensure the weight of rubber material;
(2) Improve the fluidity of the rubber material;
(3) Modify the mold, reasonably design the exhaust hole, parting mold structure, etc.
Dalian ftz Richon Int'l trade co., ltd. is a professional AC blowing agent supplier. If you would like to know more about the product, please click on the website and contact us. We'll share you more information.
Website: https://www.ftz-richon.com/
mail: info@richon-chem.com
