Q: There are air bubbles or pinholes on the surface of nitrile gloves.
A: The glove solution is mixed with air in the process of mixing and is not fully defoamed, in which case vacuum defoaming can be used. Or the vulcanization temperature is too high, and the chemical solvent volatilizes too quickly to form pores, which requires adjusting the vulcanization temperature curve to avoid local overheating. If the hand model is not thoroughly cleaned before dipping, and there are still oil or impurities, in this case, it is necessary to choose a more thorough glove former cleaning system.
Q: How to solve the problem if the glove solution sets too fast or too slowly?
A: Reasonably control the glove solution storage temperature (usually 20-30℃), adjust the vulcanizing agent/accelerator ratio until the glove solution solidification effect is good.
Q: The thickness of gloves produced in the same batch is uneven.
A: There is a problem with the hand mold during the impregnation process, which may be caused by inconsistent speeds or uneven concentration of coagulant. This requires adjusting the parameters of the automatic glove production line, such as impregnation time, lifting speed, etc. It is also necessary to regularly test the concentration of the coagulant to ensure that the coagulant is uniform.
Q: When configuring the original solution of gloves, the slurry has poor fluidity and insufficient viscosity, which leads to uneven thickness of the gloves produced.
A: Real-time monitoring of glove solution viscosity, strict control of the proportion of chemical solvents, scientific adjustment of chemical reagent formulations when necessary when mixing glove solution, and use of constant temperature mixing equipment. In addition, it is necessary to filter the glove solution to remove impurities and undissolved particles.
Q: The gloves produced are sticky and easy to tear.
A: This may be due to the low curing temperature or short curing time, or the need to adjust the curing ratio formula. Then, adjust the vulcanization temperature (usually 100-130℃, time 5-10 minutes). Adjusting the vulcanization mix, such as increasing the amount of sulfur or accelerator.
Q: The gloves produced are yellow or discolored.
A: This situation may be that the vulcanization temperature is too high, and it is necessary to adjust the vulcanization stability to avoid local overheating leading to rubber oxidation. In addition, antioxidants can be added to prevent aging discoloration.
Q: The hand model is easy to be torn and difficult to be taken off when it passes through the stripping machine, and the success rate is low.
A: In this case, consider using a more efficient release agent to optimize hand mold pretreatment. Also, consider adjusting the vulcanization time to avoid excessive vulcanization, resulting in too strong an adhesion of rubber to the mold.
Q: The failure rate is high when glove watertight testing is carried out.
A: This may be due to impurities in the glove solution, such as dust, undissolved particles, or unstable operation during impregnation. This situation requires high-precision filters to filter the glove solution, but also consider optimizing the impregnation parameters to ensure a uniform film.
Q: The surface of the nitrile gloves is sticky, and white powder appears.
A: In this case, it is necessary to consider whether chlorine washing is sufficient, and it is recommended to strengthen the chlorine washing process or polymer coating. Prolong curing time if necessary.
Q: The size of the same batch of nitrile gloves is inconsistent, such as the length and width are not standard.
A: This may be due to the size error of the hand mold, which reduces the surface wear size due to long-term use of the hand mold. It may also be that the shrinkage rate of the glove solution is unstable (vulcanization process fluctuation). This situation requires regular calibration of the hand mold size. Optimize vulcanization process and control shrinkage rate.