Analysis of common machining problems in rubber products forming process

Spray frost
(1) the curing time is not long enough. (2) the vulcanization system needs to be improved. (3) mixing roller temperature is too high, air temperature or humidity is too large. (4) the mixing of the compound is not uniform enough, or the stopping time is not enough. (5) Easy to spray frost after rubber aging (6) Should grasp the upper limit dosage of several kinds of formulations easy to spray frost, otherwise it is difficult to avoid spraying frost.
Microporous rubber parts
(1) raw materials are too much moisture, and raw materials can be used again after drying. The blended rubber can be added to some CaO.
Open glue
(1) the plastic value is small and the initial adhesion force is small. (2) the adhesive has mild sulphur. (3) it is also possible to increase the rate of gum content.
Uneven thickness
(1) use silicone or paper pad. (2) if the product is super thick, the mold temperature can be reduced and the curing time can be prolonged. (3) if bulging is caused by unripe, the curing time can be appropriately increased.
Lack of glue
(1) glue is not allowed. (2) the mold temperature is too high. (3) under pressure. (3) the fluidity of the rubber is too poor to spread zinc stearate on the surface of the compound or improve the degree of plasticizing. (4) adjust the formula to slow down the sulphur speed.
Trapped gas
(1) the number of exhaust times is not enough. (2) the mold is unreasonable, add the exhaust slot. (3) two exhausts for suitable products. (4) spray a small amount of release agent.
Cracked
(1) the mold temperature is too high. (2) excessive release of mold release agent. (3) the way out is not correct. (4) mold closing line can improve machine pressure. (5) mold marks should be removed in time. (6) sulfur. (7) the mold structure is unreasonable.
Bubble
(1) the mold temperature is too high. (2) the curing time is too long. (3) increase the number of exhausts.
Dirty dirty
(1) the rubber is dirty, and the environment should be paid attention to when making glue. (2) the molding table and surrounding environment are not clean. (3) for some products, the mold can be electroplated or sandblasting. (4) small surface area of mold surface can be cleaned with methyl alcohol or alcohol. (5) mold production must be washed with mold wash agent for a certain period of time.
Unfamiliar
(1) the temperature is not high enough. (2) the curing time is not long enough. (3) the vulcanization system needs to be improved. (4) two vulcanization can be carried out.
Uneven color and lustre
(1) the temperature of the plate is uneven. (2) the mold is not clean. (3) for certain color changing (purple) colors, the vulcanizing die and mild vulcanization time should be strictly controlled.
dislocation
(1) the positioning cone is loose and the clamping is not accurate. (2) the mold itself is unreasonable.