Common Problems in Nitrile Gloves Production Process

April 14,2022

In recent years, allergic events in natural latex-coated gloves have occurred frequently, mainly due to the presence of allergenic proteins in natural latex. The current solution for the safety glove industry is the manufacture of safety latex products. The latter is the ideal target.


The most promising alternative to natural latex is synthetic latex, ie nitrile latex. Nitrile-impregnated labor protection gloves are free of allergens, making them more comfortable and safe to wear. Its dial application areas are the pharmaceutical industry, the semiconductor industry and the oil field. Nitrile gloves are ideal for more demanding jobs.


Disposable Nitrile Protective Gloves


If the nitrile latex is to be vented after mixing is complete, the mold used will not be glazed. If a glossy mold film is used, the mold will shrink excessively. After the coagulant has dried, the mold temperature should not exceed 70℃. If the temperature is higher than 70℃, poor film formation will result and the film will start to gel after dipping into the nitrile latex. The correct pH will ensure this process is completed before the leaching stage.


The next problem is leaching gloves, because nitrile latex is relatively stable, so there is a lot of surfactant in the wet gel. Leaching the water will remove excess surfactant, which remains in calcium chloride and soluble impurities. The leaching temperature cannot exceed 45℃, above which the film will shrink.


The final stage on the production line is vulcanization. Nitrile latex is not prevulcanized, so the curing temperature should be high. During the curing cycle, the oven temperature must exceed 110℃. The optimal curing conditions should start from 80℃-90℃, then increase to 110℃-120℃, and finally decrease to 80℃~90℃, under-vulcanized nitrile material will show wrinkles, stickiness and damage durability sex. After demolding, the semi-finished gloves are chlorinated to remove surface viscosity.


Common problems and solutions of nitrile gloves


There are some common problems and solutions in the production of nitrile immersion safety gloves:


✔️The first problem is pinholes:


Reasons: Nitrile rubber has hidden air bubbles, which are not suitable for impregnation, inappropriate condensation conditions, and poor dispersion.


Solution: The mixing time of the nitrile material is more than 16h, the temperature of the hand mold should not be too high, the temperature of the rubber material should be lower than 24℃, the hand mold should be clean, and the coagulant should be filtered to ensure adequate dispersion of the grinding time.


✔️The second problem is the flow marks and knife marks of the nitrile:


Reasons: In the horrific process, the nitrile material is not continuously in and out, the gelation rate is not properly controlled, and the immersion temperature is not properly controlled.


Solution: Reduce jitter, control the amount of stabilizer and control the dipping temperature.


To sum up


For more questions, please feel free to contact us.